1 /* 2 * Copyright (c) 1982, 1986, 1993, 1994, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 34 * $FreeBSD: src/sys/netinet/tcp_var.h,v 1.76 2002/03/19 21:25:46 alfred Exp $ 35 */ 36 37 #ifndef _NETINET_TCP_VAR_H_ 38 #define _NETINET_TCP_VAR_H_ 39 40 #include <netinet/in_pcb.h> /* needed for in_conninfo, inp_gen_t */ 41 42 /* 43 * Kernel variables for tcp. 44 */ 45 extern int tcp_do_rfc1323; 46 extern int tcp_do_rfc1644; 47 48 /* TCP segment queue entry */ 49 struct tseg_qent { 50 LIST_ENTRY(tseg_qent) tqe_q; 51 int tqe_len; /* TCP segment data length */ 52 struct tcphdr *tqe_th; /* a pointer to tcp header */ 53 struct mbuf *tqe_m; /* mbuf contains packet */ 54 }; 55 LIST_HEAD(tsegqe_head, tseg_qent); 56 #ifdef MALLOC_DECLARE 57 MALLOC_DECLARE(M_TSEGQ); 58 #endif 59 60 struct tcptemp { 61 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 62 struct tcphdr tt_t; 63 }; 64 65 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 66 67 /* 68 * Tcp control block, one per tcp; fields: 69 * Organized for 16 byte cacheline efficiency. 70 */ 71 struct tcpcb { 72 struct tsegqe_head t_segq; 73 int t_dupacks; /* consecutive dup acks recd */ 74 struct tcptemp *unused; /* unused */ 75 76 struct callout *tt_rexmt; /* retransmit timer */ 77 struct callout *tt_persist; /* retransmit persistence */ 78 struct callout *tt_keep; /* keepalive */ 79 struct callout *tt_2msl; /* 2*msl TIME_WAIT timer */ 80 struct callout *tt_delack; /* delayed ACK timer */ 81 82 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 83 int t_state; /* state of this connection */ 84 u_int t_flags; 85 #define TF_ACKNOW 0x00001 /* ack peer immediately */ 86 #define TF_DELACK 0x00002 /* ack, but try to delay it */ 87 #define TF_NODELAY 0x00004 /* don't delay packets to coalesce */ 88 #define TF_NOOPT 0x00008 /* don't use tcp options */ 89 #define TF_SENTFIN 0x00010 /* have sent FIN */ 90 #define TF_REQ_SCALE 0x00020 /* have/will request window scaling */ 91 #define TF_RCVD_SCALE 0x00040 /* other side has requested scaling */ 92 #define TF_REQ_TSTMP 0x00080 /* have/will request timestamps */ 93 #define TF_RCVD_TSTMP 0x00100 /* a timestamp was received in SYN */ 94 #define TF_SACK_PERMIT 0x00200 /* other side said I could SACK */ 95 #define TF_NEEDSYN 0x00400 /* send SYN (implicit state) */ 96 #define TF_NEEDFIN 0x00800 /* send FIN (implicit state) */ 97 #define TF_NOPUSH 0x01000 /* don't push */ 98 #define TF_REQ_CC 0x02000 /* have/will request CC */ 99 #define TF_RCVD_CC 0x04000 /* a CC was received in SYN */ 100 #define TF_SENDCCNEW 0x08000 /* send CCnew instead of CC in SYN */ 101 #define TF_MORETOCOME 0x10000 /* More data to be appended to sock */ 102 #define TF_LQ_OVERFLOW 0x20000 /* listen queue overflow */ 103 #define TF_LASTIDLE 0x40000 /* connection was previously idle */ 104 #define TF_RXWIN0SENT 0x80000 /* sent a receiver win 0 in response */ 105 int t_force; /* 1 if forcing out a byte */ 106 107 tcp_seq snd_una; /* send unacknowledged */ 108 tcp_seq snd_max; /* highest sequence number sent; 109 * used to recognize retransmits 110 */ 111 tcp_seq snd_nxt; /* send next */ 112 tcp_seq snd_up; /* send urgent pointer */ 113 114 tcp_seq snd_wl1; /* window update seg seq number */ 115 tcp_seq snd_wl2; /* window update seg ack number */ 116 tcp_seq iss; /* initial send sequence number */ 117 tcp_seq irs; /* initial receive sequence number */ 118 119 tcp_seq rcv_nxt; /* receive next */ 120 tcp_seq rcv_adv; /* advertised window */ 121 u_long rcv_wnd; /* receive window */ 122 tcp_seq rcv_up; /* receive urgent pointer */ 123 124 u_long snd_wnd; /* send window */ 125 u_long snd_cwnd; /* congestion-controlled window */ 126 u_long snd_ssthresh; /* snd_cwnd size threshold for 127 * for slow start exponential to 128 * linear switch 129 */ 130 tcp_seq snd_recover; /* for use in fast recovery */ 131 132 u_int t_maxopd; /* mss plus options */ 133 134 u_long t_rcvtime; /* inactivity time */ 135 u_long t_starttime; /* time connection was established */ 136 int t_rtttime; /* round trip time */ 137 tcp_seq t_rtseq; /* sequence number being timed */ 138 139 int t_rxtcur; /* current retransmit value (ticks) */ 140 u_int t_maxseg; /* maximum segment size */ 141 int t_srtt; /* smoothed round-trip time */ 142 int t_rttvar; /* variance in round-trip time */ 143 144 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 145 u_int t_rttmin; /* minimum rtt allowed */ 146 u_long t_rttupdated; /* number of times rtt sampled */ 147 u_long max_sndwnd; /* largest window peer has offered */ 148 149 int t_softerror; /* possible error not yet reported */ 150 /* out-of-band data */ 151 char t_oobflags; /* have some */ 152 char t_iobc; /* input character */ 153 #define TCPOOB_HAVEDATA 0x01 154 #define TCPOOB_HADDATA 0x02 155 /* RFC 1323 variables */ 156 u_char snd_scale; /* window scaling for send window */ 157 u_char rcv_scale; /* window scaling for recv window */ 158 u_char request_r_scale; /* pending window scaling */ 159 u_char requested_s_scale; 160 u_long ts_recent; /* timestamp echo data */ 161 162 u_long ts_recent_age; /* when last updated */ 163 tcp_seq last_ack_sent; 164 /* RFC 1644 variables */ 165 tcp_cc cc_send; /* send connection count */ 166 tcp_cc cc_recv; /* receive connection count */ 167 /* experimental */ 168 u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 169 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 170 u_long t_badrxtwin; /* window for retransmit recovery */ 171 }; 172 173 /* 174 * Structure to hold TCP options that are only used during segment 175 * processing (in tcp_input), but not held in the tcpcb. 176 * It's basically used to reduce the number of parameters 177 * to tcp_dooptions. 178 */ 179 struct tcpopt { 180 u_long to_flags; /* which options are present */ 181 #define TOF_TS 0x0001 /* timestamp */ 182 #define TOF_CC 0x0002 /* CC and CCnew are exclusive */ 183 #define TOF_CCNEW 0x0004 184 #define TOF_CCECHO 0x0008 185 #define TOF_MSS 0x0010 186 #define TOF_SCALE 0x0020 187 u_int32_t to_tsval; 188 u_int32_t to_tsecr; 189 tcp_cc to_cc; /* holds CC or CCnew */ 190 tcp_cc to_ccecho; 191 u_int16_t to_mss; 192 u_int8_t to_requested_s_scale; 193 u_int8_t to_pad; 194 }; 195 196 struct syncache { 197 inp_gen_t sc_inp_gencnt; /* pointer check */ 198 struct tcpcb *sc_tp; /* tcb for listening socket */ 199 struct mbuf *sc_ipopts; /* source route */ 200 struct in_conninfo sc_inc; /* addresses */ 201 #define sc_route sc_inc.inc_route 202 #define sc_route6 sc_inc.inc6_route 203 u_int32_t sc_tsrecent; 204 tcp_cc sc_cc_send; /* holds CC or CCnew */ 205 tcp_cc sc_cc_recv; 206 tcp_seq sc_irs; /* seq from peer */ 207 tcp_seq sc_iss; /* our ISS */ 208 u_long sc_rxttime; /* retransmit time */ 209 u_int16_t sc_rxtslot; /* retransmit counter */ 210 u_int16_t sc_peer_mss; /* peer's MSS */ 211 u_int16_t sc_wnd; /* advertised window */ 212 u_int8_t sc_requested_s_scale:4, 213 sc_request_r_scale:4; 214 u_int8_t sc_flags; 215 #define SCF_NOOPT 0x01 /* no TCP options */ 216 #define SCF_WINSCALE 0x02 /* negotiated window scaling */ 217 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ 218 #define SCF_CC 0x08 /* negotiated CC */ 219 #define SCF_UNREACH 0x10 /* icmp unreachable received */ 220 #define SCF_KEEPROUTE 0x20 /* keep cloned route */ 221 TAILQ_ENTRY(syncache) sc_hash; 222 TAILQ_ENTRY(syncache) sc_timerq; 223 }; 224 225 struct syncache_head { 226 TAILQ_HEAD(, syncache) sch_bucket; 227 u_int sch_length; 228 }; 229 230 /* 231 * The TAO cache entry which is stored in the protocol family specific 232 * portion of the route metrics. 233 */ 234 struct rmxp_tao { 235 tcp_cc tao_cc; /* latest CC in valid SYN */ 236 tcp_cc tao_ccsent; /* latest CC sent to peer */ 237 u_short tao_mssopt; /* peer's cached MSS */ 238 #ifdef notyet 239 u_short tao_flags; /* cache status flags */ 240 #define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */ 241 #define TAOF_OK 0x0002 /* peer does understand rfc1644 */ 242 #define TAOF_UNDEF 0 /* we don't know yet */ 243 #endif /* notyet */ 244 }; 245 #define rmx_taop(r) ((struct rmxp_tao *)(r).rmx_filler) 246 247 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 248 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 249 250 /* 251 * The smoothed round-trip time and estimated variance 252 * are stored as fixed point numbers scaled by the values below. 253 * For convenience, these scales are also used in smoothing the average 254 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 255 * With these scales, srtt has 3 bits to the right of the binary point, 256 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 257 * binary point, and is smoothed with an ALPHA of 0.75. 258 */ 259 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 260 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 261 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 262 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 263 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 264 265 /* 266 * The initial retransmission should happen at rtt + 4 * rttvar. 267 * Because of the way we do the smoothing, srtt and rttvar 268 * will each average +1/2 tick of bias. When we compute 269 * the retransmit timer, we want 1/2 tick of rounding and 270 * 1 extra tick because of +-1/2 tick uncertainty in the 271 * firing of the timer. The bias will give us exactly the 272 * 1.5 tick we need. But, because the bias is 273 * statistical, we have to test that we don't drop below 274 * the minimum feasible timer (which is 2 ticks). 275 * This version of the macro adapted from a paper by Lawrence 276 * Brakmo and Larry Peterson which outlines a problem caused 277 * by insufficient precision in the original implementation, 278 * which results in inappropriately large RTO values for very 279 * fast networks. 280 */ 281 #define TCP_REXMTVAL(tp) \ 282 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 283 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 284 285 /* 286 * TCP statistics. 287 * Many of these should be kept per connection, 288 * but that's inconvenient at the moment. 289 */ 290 struct tcpstat { 291 u_long tcps_connattempt; /* connections initiated */ 292 u_long tcps_accepts; /* connections accepted */ 293 u_long tcps_connects; /* connections established */ 294 u_long tcps_drops; /* connections dropped */ 295 u_long tcps_conndrops; /* embryonic connections dropped */ 296 u_long tcps_closed; /* conn. closed (includes drops) */ 297 u_long tcps_segstimed; /* segs where we tried to get rtt */ 298 u_long tcps_rttupdated; /* times we succeeded */ 299 u_long tcps_delack; /* delayed acks sent */ 300 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 301 u_long tcps_rexmttimeo; /* retransmit timeouts */ 302 u_long tcps_persisttimeo; /* persist timeouts */ 303 u_long tcps_keeptimeo; /* keepalive timeouts */ 304 u_long tcps_keepprobe; /* keepalive probes sent */ 305 u_long tcps_keepdrops; /* connections dropped in keepalive */ 306 307 u_long tcps_sndtotal; /* total packets sent */ 308 u_long tcps_sndpack; /* data packets sent */ 309 u_long tcps_sndbyte; /* data bytes sent */ 310 u_long tcps_sndrexmitpack; /* data packets retransmitted */ 311 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 312 u_long tcps_sndacks; /* ack-only packets sent */ 313 u_long tcps_sndprobe; /* window probes sent */ 314 u_long tcps_sndurg; /* packets sent with URG only */ 315 u_long tcps_sndwinup; /* window update-only packets sent */ 316 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 317 318 u_long tcps_rcvtotal; /* total packets received */ 319 u_long tcps_rcvpack; /* packets received in sequence */ 320 u_long tcps_rcvbyte; /* bytes received in sequence */ 321 u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 322 u_long tcps_rcvbadoff; /* packets received with bad offset */ 323 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 324 u_long tcps_rcvshort; /* packets received too short */ 325 u_long tcps_rcvduppack; /* duplicate-only packets received */ 326 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 327 u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 328 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 329 u_long tcps_rcvoopack; /* out-of-order packets received */ 330 u_long tcps_rcvoobyte; /* out-of-order bytes received */ 331 u_long tcps_rcvpackafterwin; /* packets with data after window */ 332 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 333 u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 334 u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 335 u_long tcps_rcvdupack; /* rcvd duplicate acks */ 336 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 337 u_long tcps_rcvackpack; /* rcvd ack packets */ 338 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 339 u_long tcps_rcvwinupd; /* rcvd window update packets */ 340 u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 341 u_long tcps_predack; /* times hdr predict ok for acks */ 342 u_long tcps_preddat; /* times hdr predict ok for data pkts */ 343 u_long tcps_pcbcachemiss; 344 u_long tcps_cachedrtt; /* times cached RTT in route updated */ 345 u_long tcps_cachedrttvar; /* times cached rttvar updated */ 346 u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 347 u_long tcps_usedrtt; /* times RTT initialized from route */ 348 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 349 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 350 u_long tcps_persistdrop; /* timeout in persist state */ 351 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 352 u_long tcps_mturesent; /* resends due to MTU discovery */ 353 u_long tcps_listendrop; /* listen queue overflows */ 354 355 u_long tcps_sc_added; /* entry added to syncache */ 356 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 357 u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 358 u_long tcps_sc_dropped; /* could not reply to packet */ 359 u_long tcps_sc_completed; /* successful extraction of entry */ 360 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 361 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 362 u_long tcps_sc_reset; /* RST removed entry from syncache */ 363 u_long tcps_sc_stale; /* timed out or listen socket gone */ 364 u_long tcps_sc_aborted; /* syncache entry aborted */ 365 u_long tcps_sc_badack; /* removed due to bad ACK */ 366 u_long tcps_sc_unreach; /* ICMP unreachable received */ 367 u_long tcps_sc_zonefail; /* zalloc() failed */ 368 u_long tcps_sc_sendcookie; /* SYN cookie sent */ 369 u_long tcps_sc_recvcookie; /* SYN cookie received */ 370 }; 371 372 /* 373 * TCB structure exported to user-land via sysctl(3). 374 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 375 * included. Not all of our clients do. 376 */ 377 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 378 struct xtcpcb { 379 size_t xt_len; 380 struct inpcb xt_inp; 381 struct tcpcb xt_tp; 382 struct xsocket xt_socket; 383 u_quad_t xt_alignment_hack; 384 }; 385 #endif 386 387 /* 388 * Names for TCP sysctl objects 389 */ 390 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 391 #define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */ 392 #define TCPCTL_MSSDFLT 3 /* MSS default */ 393 #define TCPCTL_STATS 4 /* statistics (read-only) */ 394 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 395 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 396 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 397 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 398 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 399 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 400 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 401 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 402 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 403 #define TCPCTL_MAXID 14 404 405 #define TCPCTL_NAMES { \ 406 { 0, 0 }, \ 407 { "rfc1323", CTLTYPE_INT }, \ 408 { "rfc1644", CTLTYPE_INT }, \ 409 { "mssdflt", CTLTYPE_INT }, \ 410 { "stats", CTLTYPE_STRUCT }, \ 411 { "rttdflt", CTLTYPE_INT }, \ 412 { "keepidle", CTLTYPE_INT }, \ 413 { "keepintvl", CTLTYPE_INT }, \ 414 { "sendspace", CTLTYPE_INT }, \ 415 { "recvspace", CTLTYPE_INT }, \ 416 { "keepinit", CTLTYPE_INT }, \ 417 { "pcblist", CTLTYPE_STRUCT }, \ 418 { "delacktime", CTLTYPE_INT }, \ 419 { "v6mssdflt", CTLTYPE_INT }, \ 420 } 421 422 423 #ifdef _KERNEL 424 #ifdef SYSCTL_DECL 425 SYSCTL_DECL(_net_inet_tcp); 426 #endif 427 428 extern struct inpcbhead tcb; /* head of queue of active tcpcb's */ 429 extern struct inpcbinfo tcbinfo; 430 extern struct tcpstat tcpstat; /* tcp statistics */ 431 extern int tcp_mssdflt; /* XXX */ 432 extern int tcp_delack_enabled; 433 extern int tcp_do_newreno; 434 extern int ss_fltsz; 435 extern int ss_fltsz_local; 436 437 void tcp_canceltimers(struct tcpcb *); 438 struct tcpcb * 439 tcp_close(struct tcpcb *); 440 void tcp_ctlinput(int, struct sockaddr *, void *); 441 int tcp_ctloutput(struct socket *, struct sockopt *); 442 struct tcpcb * 443 tcp_drop(struct tcpcb *, int); 444 void tcp_drain(void); 445 void tcp_fasttimo(void); 446 struct rmxp_tao * 447 tcp_gettaocache(struct in_conninfo *); 448 void tcp_init(void); 449 void tcp_input(struct mbuf *, int); 450 void tcp_mss(struct tcpcb *, int); 451 int tcp_mssopt(struct tcpcb *); 452 void tcp_drop_syn_sent(struct inpcb *, int); 453 void tcp_mtudisc(struct inpcb *, int); 454 struct tcpcb * 455 tcp_newtcpcb(struct inpcb *); 456 int tcp_output(struct tcpcb *); 457 void tcp_quench(struct inpcb *, int); 458 void tcp_respond(struct tcpcb *, void *, 459 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 460 struct rtentry * 461 tcp_rtlookup(struct in_conninfo *); 462 void tcp_setpersist(struct tcpcb *); 463 void tcp_slowtimo(void); 464 struct tcptemp * 465 tcp_maketemplate(struct tcpcb *); 466 void tcp_fillheaders(struct tcpcb *, void *, void *); 467 struct tcpcb * 468 tcp_timers(struct tcpcb *, int); 469 void tcp_trace(int, int, struct tcpcb *, void *, struct tcphdr *, int); 470 void syncache_init(void); 471 void syncache_unreach(struct in_conninfo *, struct tcphdr *); 472 int syncache_expand(struct in_conninfo *, struct tcphdr *, 473 struct socket **, struct mbuf *); 474 int syncache_add(struct in_conninfo *, struct tcpopt *, 475 struct tcphdr *, struct socket **, struct mbuf *); 476 void syncache_chkrst(struct in_conninfo *, struct tcphdr *); 477 void syncache_badack(struct in_conninfo *); 478 479 extern struct pr_usrreqs tcp_usrreqs; 480 extern u_long tcp_sendspace; 481 extern u_long tcp_recvspace; 482 tcp_seq tcp_new_isn(struct tcpcb *); 483 484 #endif /* _KERNEL */ 485 486 #endif /* _NETINET_TCP_VAR_H_ */ 487