tcp_var.h revision 1.53
1 /* $NetBSD: tcp_var.h,v 1.53 1998/09/10 10:47:01 mouse Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Copyright (c) 1982, 1986, 1993, 1994, 1995 42 * The Regents of the University of California. All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 3. All advertising materials mentioning features or use of this software 53 * must display the following acknowledgement: 54 * This product includes software developed by the University of 55 * California, Berkeley and its contributors. 56 * 4. Neither the name of the University nor the names of its contributors 57 * may be used to endorse or promote products derived from this software 58 * without specific prior written permission. 59 * 60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 63 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 70 * SUCH DAMAGE. 71 * 72 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 73 */ 74 75 #ifndef _NETINET_TCP_VAR_H_ 76 #define _NETINET_TCP_VAR_H_ 77 78 /* 79 * Kernel variables for tcp. 80 */ 81 82 /* 83 * Tcp control block, one per tcp; fields: 84 */ 85 struct tcpcb { 86 struct ipqehead segq; /* sequencing queue */ 87 u_int t_timer[TCPT_NTIMERS]; /* tcp timers */ 88 short t_state; /* state of this connection */ 89 short t_rxtshift; /* log(2) of rexmt exp. backoff */ 90 short t_rxtcur; /* current retransmit value */ 91 short t_dupacks; /* consecutive dup acks recd */ 92 u_short t_peermss; /* peer's maximum segment size */ 93 u_short t_ourmss; /* our's maximum segment size */ 94 u_short t_segsz; /* current segment size in use */ 95 char t_force; /* 1 if forcing out a byte */ 96 u_short t_flags; 97 #define TF_ACKNOW 0x0001 /* ack peer immediately */ 98 #define TF_DELACK 0x0002 /* ack, but try to delay it */ 99 #define TF_NODELAY 0x0004 /* don't delay packets to coalesce */ 100 #define TF_NOOPT 0x0008 /* don't use tcp options */ 101 #define TF_REQ_SCALE 0x0020 /* have/will request window scaling */ 102 #define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */ 103 #define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */ 104 #define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */ 105 #define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */ 106 #define TF_SYN_REXMT 0x0400 /* rexmit timer fired on SYN */ 107 #define TF_WILL_SACK 0x0800 /* try to use SACK */ 108 #define TF_CANT_TXSACK 0x1000 /* other side said I could not SACK */ 109 #define TF_IGNR_RXSACK 0x2000 /* ignore received SACK blocks */ 110 111 112 struct tcpiphdr *t_template; /* skeletal packet for transmit */ 113 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 114 LIST_ENTRY(tcpcb) t_delack; /* delayed ACK queue */ 115 /* 116 * The following fields are used as in the protocol specification. 117 * See RFC783, Dec. 1981, page 21. 118 */ 119 /* send sequence variables */ 120 tcp_seq snd_una; /* send unacknowledged */ 121 tcp_seq snd_nxt; /* send next */ 122 tcp_seq snd_up; /* send urgent pointer */ 123 tcp_seq snd_wl1; /* window update seg seq number */ 124 tcp_seq snd_wl2; /* window update seg ack number */ 125 tcp_seq iss; /* initial send sequence number */ 126 u_long snd_wnd; /* send window */ 127 /* receive sequence variables */ 128 u_long rcv_wnd; /* receive window */ 129 tcp_seq rcv_nxt; /* receive next */ 130 tcp_seq rcv_up; /* receive urgent pointer */ 131 tcp_seq irs; /* initial receive sequence number */ 132 /* 133 * Additional variables for this implementation. 134 */ 135 /* receive variables */ 136 tcp_seq rcv_adv; /* advertised window */ 137 /* retransmit variables */ 138 tcp_seq snd_max; /* highest sequence number sent; 139 * used to recognize retransmits 140 */ 141 /* congestion control (for slow start, source quench, retransmit after loss) */ 142 u_long snd_cwnd; /* congestion-controlled window */ 143 u_long snd_ssthresh; /* snd_cwnd size threshhold for 144 * for slow start exponential to 145 * linear switch 146 */ 147 /* 148 * transmit timing stuff. See below for scale of srtt and rttvar. 149 * "Variance" is actually smoothed difference. 150 */ 151 short t_idle; /* inactivity time */ 152 short t_rtt; /* round trip time */ 153 tcp_seq t_rtseq; /* sequence number being timed */ 154 short t_srtt; /* smoothed round-trip time */ 155 short t_rttvar; /* variance in round-trip time */ 156 short t_rttmin; /* minimum rtt allowed */ 157 u_long max_sndwnd; /* largest window peer has offered */ 158 159 /* out-of-band data */ 160 char t_oobflags; /* have some */ 161 char t_iobc; /* input character */ 162 #define TCPOOB_HAVEDATA 0x01 163 #define TCPOOB_HADDATA 0x02 164 short t_softerror; /* possible error not yet reported */ 165 166 /* RFC 1323 variables */ 167 u_char snd_scale; /* window scaling for send window */ 168 u_char rcv_scale; /* window scaling for recv window */ 169 u_char request_r_scale; /* pending window scaling */ 170 u_char requested_s_scale; 171 u_int32_t ts_recent; /* timestamp echo data */ 172 u_int32_t ts_recent_age; /* when last updated */ 173 tcp_seq last_ack_sent; 174 175 /* SACK stuff */ 176 struct ipqehead timeq; /* time sequenced queue (for SACK) */ 177 }; 178 179 /* 180 * Queue for delayed ACK processing. 181 */ 182 LIST_HEAD(tcp_delack_head, tcpcb); 183 #ifdef _KERNEL 184 extern struct tcp_delack_head tcp_delacks; 185 186 #define TCP_SET_DELACK(tp) \ 187 do { \ 188 if (((tp)->t_flags & TF_DELACK) == 0) { \ 189 (tp)->t_flags |= TF_DELACK; \ 190 LIST_INSERT_HEAD(&tcp_delacks, (tp), t_delack); \ 191 } \ 192 } while (0) 193 194 #define TCP_CLEAR_DELACK(tp) \ 195 do { \ 196 if ((tp)->t_flags & TF_DELACK) { \ 197 (tp)->t_flags &= ~TF_DELACK; \ 198 LIST_REMOVE((tp), t_delack); \ 199 } \ 200 } while (0) 201 #endif /* _KERNEL */ 202 203 /* 204 * Handy way of passing around TCP option info. 205 */ 206 struct tcp_opt_info { 207 int ts_present; 208 u_int32_t ts_val; 209 u_int32_t ts_ecr; 210 u_int16_t maxseg; 211 }; 212 213 /* 214 * Data for the TCP compressed state engine. 215 */ 216 struct syn_cache { 217 TAILQ_ENTRY(syn_cache) sc_queue; 218 u_int sc_timer; 219 u_int32_t sc_hash; 220 struct in_addr sc_src; 221 struct in_addr sc_dst; 222 tcp_seq sc_irs; 223 tcp_seq sc_iss; 224 u_short sc_rexmt_count; /* number of times SYN,ACK 225 was retransmitted */ 226 u_short sc_flags; 227 228 #define SCF_UNREACH 0x0001 /* we've had an unreach error */ 229 #define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */ 230 231 struct mbuf *sc_ipopts; /* IP options */ 232 u_int16_t sc_sport; 233 u_int16_t sc_dport; 234 u_int16_t sc_peermaxseg; 235 u_int16_t sc_ourmaxseg; 236 u_int8_t sc_request_r_scale : 4, 237 sc_requested_s_scale : 4; 238 }; 239 240 struct syn_cache_head { 241 TAILQ_HEAD(, syn_cache) sch_queue; /* time-sorted entries */ 242 LIST_ENTRY(syn_cache_head) sch_headq; /* non-empty buckets */ 243 u_short sch_length; /* # entries in bucket */ 244 }; 245 246 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 247 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 248 249 /* 250 * The smoothed round-trip time and estimated variance 251 * are stored as fixed point numbers scaled by the values below. 252 * For convenience, these scales are also used in smoothing the average 253 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 254 * With these scales, srtt has 3 bits to the right of the binary point, 255 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 256 * binary point, and is smoothed with an ALPHA of 0.75. 257 */ 258 #define TCP_RTT_SHIFT 3 /* shift for srtt; 3 bits frac. */ 259 #define TCP_RTTVAR_SHIFT 2 /* multiplier for rttvar; 2 bits */ 260 261 /* 262 * The initial retransmission should happen at rtt + 4 * rttvar. 263 * Because of the way we do the smoothing, srtt and rttvar 264 * will each average +1/2 tick of bias. When we compute 265 * the retransmit timer, we want 1/2 tick of rounding and 266 * 1 extra tick because of +-1/2 tick uncertainty in the 267 * firing of the timer. The bias will give us exactly the 268 * 1.5 tick we need. But, because the bias is 269 * statistical, we have to test that we don't drop below 270 * the minimum feasible timer (which is 2 ticks). 271 * This macro assumes that the value of 1<<TCP_RTTVAR_SHIFT 272 * is the same as the multiplier for rttvar. 273 */ 274 #define TCP_REXMTVAL(tp) \ 275 ((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> 2) 276 277 /* 278 * Compute the initial window for slow start. 279 */ 280 #define TCP_INITIAL_WINDOW(iw, segsz) \ 281 (((iw) == 0) ? (min(4 * (segsz), max(2 * (segsz), 4380))) : \ 282 ((segsz) * (iw))) 283 284 /* 285 * TCP statistics. 286 * Many of these should be kept per connection, 287 * but that's inconvenient at the moment. 288 */ 289 struct tcpstat { 290 u_long tcps_connattempt; /* connections initiated */ 291 u_long tcps_accepts; /* connections accepted */ 292 u_long tcps_connects; /* connections established */ 293 u_long tcps_drops; /* connections dropped */ 294 u_long tcps_conndrops; /* embryonic connections dropped */ 295 u_long tcps_closed; /* conn. closed (includes drops) */ 296 u_long tcps_segstimed; /* segs where we tried to get rtt */ 297 u_long tcps_rttupdated; /* times we succeeded */ 298 u_long tcps_delack; /* delayed acks sent */ 299 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 300 u_long tcps_rexmttimeo; /* retransmit timeouts */ 301 u_long tcps_persisttimeo; /* persist timeouts */ 302 u_long tcps_keeptimeo; /* keepalive timeouts */ 303 u_long tcps_keepprobe; /* keepalive probes sent */ 304 u_long tcps_keepdrops; /* connections dropped in keepalive */ 305 u_long tcps_persistdrops; /* connections dropped in persist */ 306 u_long tcps_connsdrained; /* connections drained due to memory 307 shortage */ 308 309 u_long tcps_sndtotal; /* total packets sent */ 310 u_long tcps_sndpack; /* data packets sent */ 311 u_long tcps_sndbyte; /* data bytes sent */ 312 u_long tcps_sndrexmitpack; /* data packets retransmitted */ 313 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 314 u_long tcps_sndacks; /* ack-only packets sent */ 315 u_long tcps_sndprobe; /* window probes sent */ 316 u_long tcps_sndurg; /* packets sent with URG only */ 317 u_long tcps_sndwinup; /* window update-only packets sent */ 318 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 319 320 u_long tcps_rcvtotal; /* total packets received */ 321 u_long tcps_rcvpack; /* packets received in sequence */ 322 u_long tcps_rcvbyte; /* bytes received in sequence */ 323 u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 324 u_long tcps_rcvbadoff; /* packets received with bad offset */ 325 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 326 u_long tcps_rcvshort; /* packets received too short */ 327 u_long tcps_rcvduppack; /* duplicate-only packets received */ 328 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 329 u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 330 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 331 u_long tcps_rcvoopack; /* out-of-order packets received */ 332 u_long tcps_rcvoobyte; /* out-of-order bytes received */ 333 u_long tcps_rcvpackafterwin; /* packets with data after window */ 334 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 335 u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 336 u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 337 u_long tcps_rcvdupack; /* rcvd duplicate acks */ 338 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 339 u_long tcps_rcvackpack; /* rcvd ack packets */ 340 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 341 u_long tcps_rcvwinupd; /* rcvd window update packets */ 342 u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 343 u_long tcps_predack; /* times hdr predict ok for acks */ 344 u_long tcps_preddat; /* times hdr predict ok for data pkts */ 345 346 u_long tcps_pcbhashmiss; /* input packets missing pcb hash */ 347 u_long tcps_noport; /* no socket on port */ 348 u_long tcps_badsyn; /* received ack for which we have 349 no SYN in compressed state */ 350 351 /* These statistics deal with the SYN cache. */ 352 u_long tcps_sc_added; /* # of entries added */ 353 u_long tcps_sc_completed; /* # of connections completed */ 354 u_long tcps_sc_timed_out; /* # of entries timed out */ 355 u_long tcps_sc_overflowed; /* # dropped due to overflow */ 356 u_long tcps_sc_reset; /* # dropped due to RST */ 357 u_long tcps_sc_unreach; /* # dropped due to ICMP unreach */ 358 u_long tcps_sc_bucketoverflow; /* # dropped due to bucket overflow */ 359 u_long tcps_sc_aborted; /* # of entries aborted (no mem) */ 360 u_long tcps_sc_dupesyn; /* # of duplicate SYNs received */ 361 u_long tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */ 362 u_long tcps_sc_collisions; /* # of hash collisions */ 363 }; 364 365 /* 366 * Names for TCP sysctl objects. 367 */ 368 #define TCPCTL_RFC1323 1 /* RFC1323 timestamps/scaling */ 369 #define TCPCTL_SENDSPACE 2 /* default send buffer */ 370 #define TCPCTL_RECVSPACE 3 /* default recv buffer */ 371 #define TCPCTL_MSSDFLT 4 /* default seg size */ 372 #define TCPCTL_SYN_CACHE_LIMIT 5 /* max size of comp. state engine */ 373 #define TCPCTL_SYN_BUCKET_LIMIT 6 /* max size of hash bucket */ 374 #define TCPCTL_SYN_CACHE_INTER 7 /* interval of comp. state timer */ 375 #define TCPCTL_INIT_WIN 8 /* initial window */ 376 #define TCPCTL_MSS_IFMTU 9 /* mss from interface, not in_maxmtu */ 377 #define TCPCTL_SACK 10 /* RFC2018 selective acknowledgement */ 378 #define TCPCTL_WSCALE 11 /* RFC1323 window scaling */ 379 #define TCPCTL_TSTAMP 12 /* RFC1323 timestamps */ 380 #define TCPCTL_COMPAT_42 13 /* 4.2BSD TCP bug work-arounds */ 381 #define TCPCTL_CWM 14 /* Congestion Window Monitoring */ 382 #define TCPCTL_CWM_BURSTSIZE 15 /* burst size allowed by CWM */ 383 #define TCPCTL_ACK_ON_PUSH 16 /* ACK immediately on PUSH */ 384 #define TCPCTL_KEEPIDLE 17 /* keepalive idle time */ 385 #define TCPCTL_KEEPINTVL 18 /* keepalive probe interval */ 386 #define TCPCTL_KEEPCNT 19 /* keepalive count */ 387 #define TCPCTL_SLOWHZ 20 /* PR_SLOWHZ (read-only) */ 388 #define TCPCTL_MAXID 21 389 390 #define TCPCTL_NAMES { \ 391 { 0, 0 }, \ 392 { "rfc1323", CTLTYPE_INT }, \ 393 { "sendspace", CTLTYPE_INT }, \ 394 { "recvspace", CTLTYPE_INT }, \ 395 { "mssdflt", CTLTYPE_INT }, \ 396 { "syn_cache_limit", CTLTYPE_INT }, \ 397 { "syn_bucket_limit", CTLTYPE_INT }, \ 398 { "syn_cache_interval", CTLTYPE_INT },\ 399 { "init_win", CTLTYPE_INT }, \ 400 { "mss_ifmtu", CTLTYPE_INT }, \ 401 { "sack", CTLTYPE_INT }, \ 402 { "win_scale", CTLTYPE_INT }, \ 403 { "timestamps", CTLTYPE_INT }, \ 404 { "compat_42", CTLTYPE_INT }, \ 405 { "cwm", CTLTYPE_INT }, \ 406 { "cwm_burstsize", CTLTYPE_INT }, \ 407 { "ack_on_push", CTLTYPE_INT }, \ 408 { "keepidle", CTLTYPE_INT }, \ 409 { "keepintvl", CTLTYPE_INT }, \ 410 { "keepcnt", CTLTYPE_INT }, \ 411 { "slowhz", CTLTYPE_INT }, \ 412 } 413 414 #ifdef _KERNEL 415 struct inpcbtable tcbtable; /* head of queue of active tcpcb's */ 416 struct tcpstat tcpstat; /* tcp statistics */ 417 u_int32_t tcp_now; /* for RFC 1323 timestamps */ 418 extern int tcp_do_rfc1323; /* enabled/disabled? */ 419 extern int tcp_do_sack; /* SACK enabled/disabled? */ 420 extern int tcp_do_win_scale; /* RFC1323 window scaling enabled/disabled? */ 421 extern int tcp_do_timestamps; /* RFC1323 timestamps enabled/disabled? */ 422 extern int tcp_mssdflt; /* default seg size */ 423 extern int tcp_init_win; /* initial window */ 424 extern int tcp_mss_ifmtu; /* take MSS from interface, not in_maxmtu */ 425 extern int tcp_compat_42; /* work around ancient broken TCP peers */ 426 extern int tcp_cwm; /* enable Congestion Window Monitoring */ 427 extern int tcp_cwm_burstsize; /* burst size allowed by CWM */ 428 extern int tcp_ack_on_push; /* ACK immediately on PUSH */ 429 extern int tcp_syn_cache_limit; /* max entries for compressed state engine */ 430 extern int tcp_syn_bucket_limit;/* max entries per hash bucket */ 431 extern int tcp_syn_cache_interval; /* compressed state timer */ 432 433 extern int tcp_syn_cache_size; 434 extern int tcp_syn_cache_timeo; 435 extern struct syn_cache_head tcp_syn_cache[]; 436 extern u_long syn_cache_count; 437 438 #define TCPCTL_VARIABLES { \ 439 { 0 }, \ 440 { 1, 0, &tcp_do_rfc1323 }, \ 441 { 1, 0, &tcp_sendspace }, \ 442 { 1, 0, &tcp_recvspace }, \ 443 { 1, 0, &tcp_mssdflt }, \ 444 { 1, 0, &tcp_syn_cache_limit }, \ 445 { 1, 0, &tcp_syn_bucket_limit }, \ 446 { 1, 0, &tcp_syn_cache_interval }, \ 447 { 1, 0, &tcp_init_win }, \ 448 { 1, 0, &tcp_mss_ifmtu }, \ 449 { 1, 0, &tcp_do_sack }, \ 450 { 1, 0, &tcp_do_win_scale }, \ 451 { 1, 0, &tcp_do_timestamps }, \ 452 { 1, 0, &tcp_compat_42 }, \ 453 { 1, 0, &tcp_cwm }, \ 454 { 1, 0, &tcp_cwm_burstsize }, \ 455 { 1, 0, &tcp_ack_on_push }, \ 456 { 1, 0, &tcp_keepidle }, \ 457 { 1, 0, &tcp_keepintvl }, \ 458 { 1, 0, &tcp_keepcnt }, \ 459 { 1, 1, 0, PR_SLOWHZ }, \ 460 } 461 462 int tcp_attach __P((struct socket *)); 463 void tcp_canceltimers __P((struct tcpcb *)); 464 struct tcpcb * 465 tcp_close __P((struct tcpcb *)); 466 void *tcp_ctlinput __P((int, struct sockaddr *, void *)); 467 int tcp_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 468 struct tcpcb * 469 tcp_disconnect __P((struct tcpcb *)); 470 struct tcpcb * 471 tcp_drop __P((struct tcpcb *, int)); 472 void tcp_dooptions __P((struct tcpcb *, 473 u_char *, int, struct tcpiphdr *, struct tcp_opt_info *)); 474 void tcp_drain __P((void)); 475 void tcp_established __P((struct tcpcb *)); 476 void tcp_fasttimo __P((void)); 477 void tcp_init __P((void)); 478 void tcp_input __P((struct mbuf *, ...)); 479 u_long tcp_mss_to_advertise __P((const struct ifnet *)); 480 void tcp_mss_from_peer __P((struct tcpcb *, int)); 481 void tcp_mtudisc __P((struct inpcb *, int)); 482 struct tcpcb * 483 tcp_newtcpcb __P((struct inpcb *)); 484 void tcp_notify __P((struct inpcb *, int)); 485 u_int tcp_optlen __P((struct tcpcb *)); 486 int tcp_output __P((struct tcpcb *)); 487 void tcp_pulloutofband __P((struct socket *, 488 struct tcpiphdr *, struct mbuf *)); 489 void tcp_quench __P((struct inpcb *, int)); 490 int tcp_reass __P((struct tcpcb *, struct tcpiphdr *, struct mbuf *)); 491 int tcp_respond __P((struct tcpcb *, 492 struct tcpiphdr *, struct mbuf *, tcp_seq, tcp_seq, int)); 493 void tcp_rmx_rtt __P((struct tcpcb *)); 494 void tcp_setpersist __P((struct tcpcb *)); 495 void tcp_slowtimo __P((void)); 496 struct tcpiphdr * 497 tcp_template __P((struct tcpcb *)); 498 struct tcpcb * 499 tcp_timers __P((struct tcpcb *, int)); 500 void tcp_trace __P((int, int, struct tcpcb *, struct tcpiphdr *, int)); 501 struct tcpcb * 502 tcp_usrclosed __P((struct tcpcb *)); 503 int tcp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 504 int tcp_usrreq __P((struct socket *, 505 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *)); 506 void tcp_xmit_timer __P((struct tcpcb *, int)); 507 tcp_seq tcp_new_iss __P((void *, u_long, tcp_seq)); 508 509 int syn_cache_add __P((struct socket *, struct mbuf *, u_char *, 510 int, struct tcp_opt_info *)); 511 void syn_cache_unreach __P((struct ip *, struct tcphdr *)); 512 struct socket * 513 syn_cache_get __P((struct socket *so, struct mbuf *)); 514 void syn_cache_init __P((void)); 515 void syn_cache_insert __P((struct syn_cache *)); 516 struct syn_cache * 517 syn_cache_lookup __P((struct tcpiphdr *, struct syn_cache_head **)); 518 void syn_cache_reset __P((struct tcpiphdr *)); 519 int syn_cache_respond __P((struct syn_cache *, struct mbuf *, 520 register struct tcpiphdr *, long, u_long)); 521 void syn_cache_timer __P((void)); 522 523 #endif 524 525 #endif /* _NETINET_TCP_VAR_H_ */ 526
Indexes created Mon Sep 22 21:09:42 GMT 2025