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 * $FreeBSD$ 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 #include <netinet/tcp.h> 42 43 /* 44 * Kernel variables for tcp. 45 */ 46 extern int tcp_do_rfc1323; 47 extern int tcp_do_rfc1644; 48 49 /* TCP segment queue entry */ 50 struct tseg_qent { 51 LIST_ENTRY(tseg_qent) tqe_q; 52 int tqe_len; /* TCP segment data length */ 53 struct tcphdr *tqe_th; /* a pointer to tcp header */ 54 struct mbuf *tqe_m; /* mbuf contains packet */ 55 }; 56 LIST_HEAD(tsegqe_head, tseg_qent); 57 #ifdef MALLOC_DECLARE 58 MALLOC_DECLARE(M_TSEGQ); 59 #endif 60 61 struct tcptemp { 62 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 63 struct tcphdr tt_t; 64 }; 65 66 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 67 68 /* 69 * Tcp control block, one per tcp; fields: 70 * Organized for 16 byte cacheline efficiency. 71 */ 72 struct tcpcb { 73 struct tsegqe_head t_segq; 74 int t_dupacks; /* consecutive dup acks recd */ 75 struct tcptemp *unused; /* unused */ 76 77 struct callout *tt_rexmt; /* retransmit timer */ 78 struct callout *tt_persist; /* retransmit persistence */ 79 struct callout *tt_keep; /* keepalive */ 80 struct callout *tt_2msl; /* 2*msl TIME_WAIT timer */ 81 struct callout *tt_delack; /* delayed ACK timer */ 82 83 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 84 int t_state; /* state of this connection */ 85 u_int t_flags; 86 #define TF_ACKNOW 0x000001 /* ack peer immediately */ 87 #define TF_DELACK 0x000002 /* ack, but try to delay it */ 88 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 89 #define TF_NOOPT 0x000008 /* don't use tcp options */ 90 #define TF_SENTFIN 0x000010 /* have sent FIN */ 91 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 92 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 93 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 94 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 95 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 96 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 97 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 98 #define TF_NOPUSH 0x001000 /* don't push */ 99 #define TF_REQ_CC 0x002000 /* have/will request CC */ 100 #define TF_RCVD_CC 0x004000 /* a CC was received in SYN */ 101 #define TF_SENDCCNEW 0x008000 /* send CCnew instead of CC in SYN */ 102 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 103 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 104 #define TF_LASTIDLE 0x040000 /* connection was previously idle */ 105 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 106 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 107 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 108 int t_force; /* 1 if forcing out a byte */ 109 110 tcp_seq snd_una; /* send unacknowledged */ 111 tcp_seq snd_max; /* highest sequence number sent; 112 * used to recognize retransmits 113 */ 114 tcp_seq snd_nxt; /* send next */ 115 tcp_seq snd_up; /* send urgent pointer */ 116 117 tcp_seq snd_wl1; /* window update seg seq number */ 118 tcp_seq snd_wl2; /* window update seg ack number */ 119 tcp_seq iss; /* initial send sequence number */ 120 tcp_seq irs; /* initial receive sequence number */ 121 122 tcp_seq rcv_nxt; /* receive next */ 123 tcp_seq rcv_adv; /* advertised window */ 124 u_long rcv_wnd; /* receive window */ 125 tcp_seq rcv_up; /* receive urgent pointer */ 126 127 u_long snd_wnd; /* send window */ 128 u_long snd_cwnd; /* congestion-controlled window */ 129 u_long snd_bwnd; /* bandwidth-controlled window */ 130 u_long snd_ssthresh; /* snd_cwnd size threshold for 131 * for slow start exponential to 132 * linear switch 133 */ 134 u_long snd_bandwidth; /* calculated bandwidth or 0 */ 135 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 136 137 u_int t_maxopd; /* mss plus options */ 138 139 u_long t_rcvtime; /* inactivity time */ 140 u_long t_starttime; /* time connection was established */ 141 int t_rtttime; /* round trip time */ 142 tcp_seq t_rtseq; /* sequence number being timed */ 143 144 int t_bw_rtttime; /* used for bandwidth calculation */ 145 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ 146 147 int t_rxtcur; /* current retransmit value (ticks) */ 148 u_int t_maxseg; /* maximum segment size */ 149 int t_srtt; /* smoothed round-trip time */ 150 int t_rttvar; /* variance in round-trip time */ 151 152 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 153 u_int t_rttmin; /* minimum rtt allowed */ 154 u_int t_rttbest; /* best rtt we've seen */ 155 u_long t_rttupdated; /* number of times rtt sampled */ 156 u_long max_sndwnd; /* largest window peer has offered */ 157 158 int t_softerror; /* possible error not yet reported */ 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 /* RFC 1323 variables */ 165 u_char snd_scale; /* window scaling for send window */ 166 u_char rcv_scale; /* window scaling for recv window */ 167 u_char request_r_scale; /* pending window scaling */ 168 u_char requested_s_scale; 169 u_long ts_recent; /* timestamp echo data */ 170 171 u_long ts_recent_age; /* when last updated */ 172 tcp_seq last_ack_sent; 173 /* RFC 1644 variables */ 174 tcp_cc cc_send; /* send connection count */ 175 tcp_cc cc_recv; /* receive connection count */ 176 /* experimental */ 177 u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 178 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 179 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 180 u_long t_badrxtwin; /* window for retransmit recovery */ 181 u_char snd_limited; /* segments limited transmitted */ 182 }; 183 184 #define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY) 185 #define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY 186 #define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY 187 188 /* 189 * Structure to hold TCP options that are only used during segment 190 * processing (in tcp_input), but not held in the tcpcb. 191 * It's basically used to reduce the number of parameters 192 * to tcp_dooptions. 193 */ 194 struct tcpopt { 195 u_long to_flags; /* which options are present */ 196 #define TOF_TS 0x0001 /* timestamp */ 197 #define TOF_CC 0x0002 /* CC and CCnew are exclusive */ 198 #define TOF_CCNEW 0x0004 199 #define TOF_CCECHO 0x0008 200 #define TOF_MSS 0x0010 201 #define TOF_SCALE 0x0020 202 u_int32_t to_tsval; 203 u_int32_t to_tsecr; 204 tcp_cc to_cc; /* holds CC or CCnew */ 205 tcp_cc to_ccecho; 206 u_int16_t to_mss; 207 u_int8_t to_requested_s_scale; 208 u_int8_t to_pad; 209 }; 210 211 struct syncache { 212 inp_gen_t sc_inp_gencnt; /* pointer check */ 213 struct tcpcb *sc_tp; /* tcb for listening socket */ 214 struct mbuf *sc_ipopts; /* source route */ 215 struct in_conninfo sc_inc; /* addresses */ 216 #define sc_route sc_inc.inc_route 217 #define sc_route6 sc_inc.inc6_route 218 u_int32_t sc_tsrecent; 219 tcp_cc sc_cc_send; /* holds CC or CCnew */ 220 tcp_cc sc_cc_recv; 221 tcp_seq sc_irs; /* seq from peer */ 222 tcp_seq sc_iss; /* our ISS */ 223 u_long sc_rxttime; /* retransmit time */ 224 u_int16_t sc_rxtslot; /* retransmit counter */ 225 u_int16_t sc_peer_mss; /* peer's MSS */ 226 u_int16_t sc_wnd; /* advertised window */ 227 u_int8_t sc_requested_s_scale:4, 228 sc_request_r_scale:4; 229 u_int8_t sc_flags; 230 #define SCF_NOOPT 0x01 /* no TCP options */ 231 #define SCF_WINSCALE 0x02 /* negotiated window scaling */ 232 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ 233 #define SCF_CC 0x08 /* negotiated CC */ 234 #define SCF_UNREACH 0x10 /* icmp unreachable received */ 235 #define SCF_KEEPROUTE 0x20 /* keep cloned route */ 236 TAILQ_ENTRY(syncache) sc_hash; 237 TAILQ_ENTRY(syncache) sc_timerq; 238 }; 239 240 struct syncache_head { 241 TAILQ_HEAD(, syncache) sch_bucket; 242 u_int sch_length; 243 }; 244 245 struct tcptw { 246 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 247 tcp_seq snd_nxt; 248 tcp_seq rcv_nxt; 249 tcp_cc cc_recv; 250 tcp_cc cc_send; 251 u_short last_win; /* cached window value */ 252 u_short tw_so_options; /* copy of so_options */ 253 struct ucred *tw_cred; /* user credentials */ 254 u_long t_recent; 255 u_long t_starttime; 256 int tw_time; 257 LIST_ENTRY(tcptw) tw_2msl; 258 }; 259 260 /* 261 * The TAO cache entry which is stored in the protocol family specific 262 * portion of the route metrics. 263 */ 264 struct rmxp_tao { 265 tcp_cc tao_cc; /* latest CC in valid SYN */ 266 tcp_cc tao_ccsent; /* latest CC sent to peer */ 267 u_short tao_mssopt; /* peer's cached MSS */ 268 #ifdef notyet 269 u_short tao_flags; /* cache status flags */ 270 #define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */ 271 #define TAOF_OK 0x0002 /* peer does understand rfc1644 */ 272 #define TAOF_UNDEF 0 /* we don't know yet */ 273 #endif /* notyet */ 274 }; 275 #define rmx_taop(r) ((struct rmxp_tao *)(r).rmx_filler) 276 277 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 278 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 279 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 280 281 /* 282 * The smoothed round-trip time and estimated variance 283 * are stored as fixed point numbers scaled by the values below. 284 * For convenience, these scales are also used in smoothing the average 285 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 286 * With these scales, srtt has 3 bits to the right of the binary point, 287 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 288 * binary point, and is smoothed with an ALPHA of 0.75. 289 */ 290 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 291 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 292 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 293 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 294 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 295 296 /* 297 * The initial retransmission should happen at rtt + 4 * rttvar. 298 * Because of the way we do the smoothing, srtt and rttvar 299 * will each average +1/2 tick of bias. When we compute 300 * the retransmit timer, we want 1/2 tick of rounding and 301 * 1 extra tick because of +-1/2 tick uncertainty in the 302 * firing of the timer. The bias will give us exactly the 303 * 1.5 tick we need. But, because the bias is 304 * statistical, we have to test that we don't drop below 305 * the minimum feasible timer (which is 2 ticks). 306 * This version of the macro adapted from a paper by Lawrence 307 * Brakmo and Larry Peterson which outlines a problem caused 308 * by insufficient precision in the original implementation, 309 * which results in inappropriately large RTO values for very 310 * fast networks. 311 */ 312 #define TCP_REXMTVAL(tp) \ 313 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 314 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 315 316 /* 317 * TCP statistics. 318 * Many of these should be kept per connection, 319 * but that's inconvenient at the moment. 320 */ 321 struct tcpstat { 322 u_long tcps_connattempt; /* connections initiated */ 323 u_long tcps_accepts; /* connections accepted */ 324 u_long tcps_connects; /* connections established */ 325 u_long tcps_drops; /* connections dropped */ 326 u_long tcps_conndrops; /* embryonic connections dropped */ 327 u_long tcps_closed; /* conn. closed (includes drops) */ 328 u_long tcps_segstimed; /* segs where we tried to get rtt */ 329 u_long tcps_rttupdated; /* times we succeeded */ 330 u_long tcps_delack; /* delayed acks sent */ 331 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 332 u_long tcps_rexmttimeo; /* retransmit timeouts */ 333 u_long tcps_persisttimeo; /* persist timeouts */ 334 u_long tcps_keeptimeo; /* keepalive timeouts */ 335 u_long tcps_keepprobe; /* keepalive probes sent */ 336 u_long tcps_keepdrops; /* connections dropped in keepalive */ 337 338 u_long tcps_sndtotal; /* total packets sent */ 339 u_long tcps_sndpack; /* data packets sent */ 340 u_long tcps_sndbyte; /* data bytes sent */ 341 u_long tcps_sndrexmitpack; /* data packets retransmitted */ 342 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 343 u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 344 u_long tcps_sndacks; /* ack-only packets sent */ 345 u_long tcps_sndprobe; /* window probes sent */ 346 u_long tcps_sndurg; /* packets sent with URG only */ 347 u_long tcps_sndwinup; /* window update-only packets sent */ 348 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 349 350 u_long tcps_rcvtotal; /* total packets received */ 351 u_long tcps_rcvpack; /* packets received in sequence */ 352 u_long tcps_rcvbyte; /* bytes received in sequence */ 353 u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 354 u_long tcps_rcvbadoff; /* packets received with bad offset */ 355 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 356 u_long tcps_rcvshort; /* packets received too short */ 357 u_long tcps_rcvduppack; /* duplicate-only packets received */ 358 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 359 u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 360 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 361 u_long tcps_rcvoopack; /* out-of-order packets received */ 362 u_long tcps_rcvoobyte; /* out-of-order bytes received */ 363 u_long tcps_rcvpackafterwin; /* packets with data after window */ 364 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 365 u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 366 u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 367 u_long tcps_rcvdupack; /* rcvd duplicate acks */ 368 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 369 u_long tcps_rcvackpack; /* rcvd ack packets */ 370 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 371 u_long tcps_rcvwinupd; /* rcvd window update packets */ 372 u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 373 u_long tcps_predack; /* times hdr predict ok for acks */ 374 u_long tcps_preddat; /* times hdr predict ok for data pkts */ 375 u_long tcps_pcbcachemiss; 376 u_long tcps_cachedrtt; /* times cached RTT in route updated */ 377 u_long tcps_cachedrttvar; /* times cached rttvar updated */ 378 u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 379 u_long tcps_usedrtt; /* times RTT initialized from route */ 380 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 381 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 382 u_long tcps_persistdrop; /* timeout in persist state */ 383 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 384 u_long tcps_mturesent; /* resends due to MTU discovery */ 385 u_long tcps_listendrop; /* listen queue overflows */ 386 387 u_long tcps_sc_added; /* entry added to syncache */ 388 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 389 u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 390 u_long tcps_sc_dropped; /* could not reply to packet */ 391 u_long tcps_sc_completed; /* successful extraction of entry */ 392 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 393 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 394 u_long tcps_sc_reset; /* RST removed entry from syncache */ 395 u_long tcps_sc_stale; /* timed out or listen socket gone */ 396 u_long tcps_sc_aborted; /* syncache entry aborted */ 397 u_long tcps_sc_badack; /* removed due to bad ACK */ 398 u_long tcps_sc_unreach; /* ICMP unreachable received */ 399 u_long tcps_sc_zonefail; /* zalloc() failed */ 400 u_long tcps_sc_sendcookie; /* SYN cookie sent */ 401 u_long tcps_sc_recvcookie; /* SYN cookie received */ 402 }; 403 404 /* 405 * TCB structure exported to user-land via sysctl(3). 406 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 407 * included. Not all of our clients do. 408 */ 409 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 410 struct xtcpcb { 411 size_t xt_len; 412 struct inpcb xt_inp; 413 struct tcpcb xt_tp; 414 struct xsocket xt_socket; 415 u_quad_t xt_alignment_hack; 416 }; 417 #endif 418 419 /* 420 * Names for TCP sysctl objects 421 */ 422 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 423 #define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */ 424 #define TCPCTL_MSSDFLT 3 /* MSS default */ 425 #define TCPCTL_STATS 4 /* statistics (read-only) */ 426 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 427 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 428 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 429 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 430 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 431 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 432 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 433 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 434 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 435 #define TCPCTL_MAXID 14 436 437 #define TCPCTL_NAMES { \ 438 { 0, 0 }, \ 439 { "rfc1323", CTLTYPE_INT }, \ 440 { "rfc1644", CTLTYPE_INT }, \ 441 { "mssdflt", CTLTYPE_INT }, \ 442 { "stats", CTLTYPE_STRUCT }, \ 443 { "rttdflt", CTLTYPE_INT }, \ 444 { "keepidle", CTLTYPE_INT }, \ 445 { "keepintvl", CTLTYPE_INT }, \ 446 { "sendspace", CTLTYPE_INT }, \ 447 { "recvspace", CTLTYPE_INT }, \ 448 { "keepinit", CTLTYPE_INT }, \ 449 { "pcblist", CTLTYPE_STRUCT }, \ 450 { "delacktime", CTLTYPE_INT }, \ 451 { "v6mssdflt", CTLTYPE_INT }, \ 452 } 453 454 455 #ifdef _KERNEL 456 #ifdef SYSCTL_DECL 457 SYSCTL_DECL(_net_inet_tcp); 458 #endif 459 460 extern struct inpcbhead tcb; /* head of queue of active tcpcb's */ 461 extern struct inpcbinfo tcbinfo; 462 extern struct tcpstat tcpstat; /* tcp statistics */ 463 extern int tcp_mssdflt; /* XXX */ 464 extern int tcp_delack_enabled; 465 extern int tcp_do_newreno; 466 extern int path_mtu_discovery; 467 extern int ss_fltsz; 468 extern int ss_fltsz_local; 469 470 void tcp_canceltimers(struct tcpcb *); 471 struct tcpcb * 472 tcp_close(struct tcpcb *); 473 void tcp_twstart(struct tcpcb *); 474 struct tcptw * 475 tcp_twclose(struct tcptw *_tw, int _reuse); 476 void tcp_ctlinput(int, struct sockaddr *, void *); 477 int tcp_ctloutput(struct socket *, struct sockopt *); 478 struct tcpcb * 479 tcp_drop(struct tcpcb *, int); 480 void tcp_drain(void); 481 void tcp_fasttimo(void); 482 struct rmxp_tao * 483 tcp_gettaocache(struct in_conninfo *); 484 void tcp_init(void); 485 void tcp_input(struct mbuf *, int); 486 void tcp_mss(struct tcpcb *, int); 487 int tcp_mssopt(struct tcpcb *); 488 struct inpcb * 489 tcp_drop_syn_sent(struct inpcb *, int); 490 struct inpcb * 491 tcp_mtudisc(struct inpcb *, int); 492 struct tcpcb * 493 tcp_newtcpcb(struct inpcb *); 494 int tcp_output(struct tcpcb *); 495 struct inpcb * 496 tcp_quench(struct inpcb *, int); 497 void tcp_respond(struct tcpcb *, void *, 498 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 499 int tcp_twrespond(struct tcptw *, struct socket *, struct mbuf *, int); 500 struct rtentry * 501 tcp_rtlookup(struct in_conninfo *); 502 void tcp_setpersist(struct tcpcb *); 503 void tcp_slowtimo(void); 504 struct tcptemp * 505 tcpip_maketemplate(struct inpcb *); 506 void tcpip_fillheaders(struct inpcb *, void *, void *); 507 struct tcpcb * 508 tcp_timers(struct tcpcb *, int); 509 void tcp_trace(int, int, struct tcpcb *, void *, struct tcphdr *, int); 510 void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); 511 void syncache_init(void); 512 void syncache_unreach(struct in_conninfo *, struct tcphdr *); 513 int syncache_expand(struct in_conninfo *, struct tcphdr *, 514 struct socket **, struct mbuf *); 515 int syncache_add(struct in_conninfo *, struct tcpopt *, 516 struct tcphdr *, struct socket **, struct mbuf *); 517 void syncache_chkrst(struct in_conninfo *, struct tcphdr *); 518 void syncache_badack(struct in_conninfo *); 519 520 extern struct pr_usrreqs tcp_usrreqs; 521 extern u_long tcp_sendspace; 522 extern u_long tcp_recvspace; 523 tcp_seq tcp_new_isn(struct tcpcb *); 524 525 #endif /* _KERNEL */ 526 527 #endif /* _NETINET_TCP_VAR_H_ */ 528