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 0x00001 /* ack peer immediately */ 87 #define TF_DELACK 0x00002 /* ack, but try to delay it */ 88 #define TF_NODELAY 0x00004 /* don't delay packets to coalesce */ 89 #define TF_NOOPT 0x00008 /* don't use tcp options */ 90 #define TF_SENTFIN 0x00010 /* have sent FIN */ 91 #define TF_REQ_SCALE 0x00020 /* have/will request window scaling */ 92 #define TF_RCVD_SCALE 0x00040 /* other side has requested scaling */ 93 #define TF_REQ_TSTMP 0x00080 /* have/will request timestamps */ 94 #define TF_RCVD_TSTMP 0x00100 /* a timestamp was received in SYN */ 95 #define TF_SACK_PERMIT 0x00200 /* other side said I could SACK */ 96 #define TF_NEEDSYN 0x00400 /* send SYN (implicit state) */ 97 #define TF_NEEDFIN 0x00800 /* send FIN (implicit state) */ 98 #define TF_NOPUSH 0x01000 /* don't push */ 99 #define TF_REQ_CC 0x02000 /* have/will request CC */ 100 #define TF_RCVD_CC 0x04000 /* a CC was received in SYN */ 101 #define TF_SENDCCNEW 0x08000 /* send CCnew instead of CC in SYN */ 102 #define TF_MORETOCOME 0x10000 /* More data to be appended to sock */ 103 #define TF_LQ_OVERFLOW 0x20000 /* listen queue overflow */ 104 #define TF_LASTIDLE 0x40000 /* connection was previously idle */ 105 #define TF_RXWIN0SENT 0x80000 /* sent a receiver win 0 in response */ 106 int t_force; /* 1 if forcing out a byte */ 107 108 tcp_seq snd_una; /* send unacknowledged */ 109 tcp_seq snd_max; /* highest sequence number sent; 110 * used to recognize retransmits 111 */ 112 tcp_seq snd_nxt; /* send next */ 113 tcp_seq snd_up; /* send urgent pointer */ 114 115 tcp_seq snd_wl1; /* window update seg seq number */ 116 tcp_seq snd_wl2; /* window update seg ack number */ 117 tcp_seq iss; /* initial send sequence number */ 118 tcp_seq irs; /* initial receive sequence number */ 119 120 tcp_seq rcv_nxt; /* receive next */ 121 tcp_seq rcv_adv; /* advertised window */ 122 u_long rcv_wnd; /* receive window */ 123 tcp_seq rcv_up; /* receive urgent pointer */ 124 125 u_long snd_wnd; /* send window */ 126 u_long snd_cwnd; /* congestion-controlled window */ 127 u_long snd_bwnd; /* bandwidth-controlled window */ 128 u_long snd_ssthresh; /* snd_cwnd size threshold for 129 * for slow start exponential to 130 * linear switch 131 */ 132 u_long snd_bandwidth; /* calculated bandwidth or 0 */ 133 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 134 tcp_seq snd_high; /* for use in NewReno Fast Recovery */ 135 136 u_int t_maxopd; /* mss plus options */ 137 138 u_long t_rcvtime; /* inactivity time */ 139 u_long t_starttime; /* time connection was established */ 140 int t_rtttime; /* round trip time */ 141 tcp_seq t_rtseq; /* sequence number being timed */ 142 143 int t_bw_rtttime; /* used for bandwidth calculation */ 144 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ 145 146 int t_rxtcur; /* current retransmit value (ticks) */ 147 u_int t_maxseg; /* maximum segment size */ 148 int t_srtt; /* smoothed round-trip time */ 149 int t_rttvar; /* variance in round-trip time */ 150 151 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 152 u_int t_rttmin; /* minimum rtt allowed */ 153 u_int t_rttbest; /* best rtt we've seen */ 154 u_long t_rttupdated; /* number of times rtt sampled */ 155 u_long max_sndwnd; /* largest window peer has offered */ 156 157 int t_softerror; /* possible error not yet reported */ 158 /* out-of-band data */ 159 char t_oobflags; /* have some */ 160 char t_iobc; /* input character */ 161 #define TCPOOB_HAVEDATA 0x01 162 #define TCPOOB_HADDATA 0x02 163 /* RFC 1323 variables */ 164 u_char snd_scale; /* window scaling for send window */ 165 u_char rcv_scale; /* window scaling for recv window */ 166 u_char request_r_scale; /* pending window scaling */ 167 u_char requested_s_scale; 168 u_long ts_recent; /* timestamp echo data */ 169 170 u_long ts_recent_age; /* when last updated */ 171 tcp_seq last_ack_sent; 172 /* RFC 1644 variables */ 173 tcp_cc cc_send; /* send connection count */ 174 tcp_cc cc_recv; /* receive connection count */ 175 /* experimental */ 176 u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 177 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 178 tcp_seq snd_high_prev; /* snd_high prior to retransmit */ 179 u_long t_badrxtwin; /* window for retransmit recovery */ 180 }; 181 182 /* 183 * Structure to hold TCP options that are only used during segment 184 * processing (in tcp_input), but not held in the tcpcb. 185 * It's basically used to reduce the number of parameters 186 * to tcp_dooptions. 187 */ 188 struct tcpopt { 189 u_long to_flags; /* which options are present */ 190 #define TOF_TS 0x0001 /* timestamp */ 191 #define TOF_CC 0x0002 /* CC and CCnew are exclusive */ 192 #define TOF_CCNEW 0x0004 193 #define TOF_CCECHO 0x0008 194 #define TOF_MSS 0x0010 195 #define TOF_SCALE 0x0020 196 u_int32_t to_tsval; 197 u_int32_t to_tsecr; 198 tcp_cc to_cc; /* holds CC or CCnew */ 199 tcp_cc to_ccecho; 200 u_int16_t to_mss; 201 u_int8_t to_requested_s_scale; 202 u_int8_t to_pad; 203 }; 204 205 struct syncache { 206 inp_gen_t sc_inp_gencnt; /* pointer check */ 207 struct tcpcb *sc_tp; /* tcb for listening socket */ 208 struct mbuf *sc_ipopts; /* source route */ 209 struct in_conninfo sc_inc; /* addresses */ 210 #define sc_route sc_inc.inc_route 211 #define sc_route6 sc_inc.inc6_route 212 u_int32_t sc_tsrecent; 213 tcp_cc sc_cc_send; /* holds CC or CCnew */ 214 tcp_cc sc_cc_recv; 215 tcp_seq sc_irs; /* seq from peer */ 216 tcp_seq sc_iss; /* our ISS */ 217 u_long sc_rxttime; /* retransmit time */ 218 u_int16_t sc_rxtslot; /* retransmit counter */ 219 u_int16_t sc_peer_mss; /* peer's MSS */ 220 u_int16_t sc_wnd; /* advertised window */ 221 u_int8_t sc_requested_s_scale:4, 222 sc_request_r_scale:4; 223 u_int8_t sc_flags; 224 #define SCF_NOOPT 0x01 /* no TCP options */ 225 #define SCF_WINSCALE 0x02 /* negotiated window scaling */ 226 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ 227 #define SCF_CC 0x08 /* negotiated CC */ 228 #define SCF_UNREACH 0x10 /* icmp unreachable received */ 229 #define SCF_KEEPROUTE 0x20 /* keep cloned route */ 230 TAILQ_ENTRY(syncache) sc_hash; 231 TAILQ_ENTRY(syncache) sc_timerq; 232 }; 233 234 struct syncache_head { 235 TAILQ_HEAD(, syncache) sch_bucket; 236 u_int sch_length; 237 }; 238 239 /* 240 * The TAO cache entry which is stored in the protocol family specific 241 * portion of the route metrics. 242 */ 243 struct rmxp_tao { 244 tcp_cc tao_cc; /* latest CC in valid SYN */ 245 tcp_cc tao_ccsent; /* latest CC sent to peer */ 246 u_short tao_mssopt; /* peer's cached MSS */ 247 #ifdef notyet 248 u_short tao_flags; /* cache status flags */ 249 #define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */ 250 #define TAOF_OK 0x0002 /* peer does understand rfc1644 */ 251 #define TAOF_UNDEF 0 /* we don't know yet */ 252 #endif /* notyet */ 253 }; 254 #define rmx_taop(r) ((struct rmxp_tao *)(r).rmx_filler) 255 256 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 257 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 258 259 /* 260 * The smoothed round-trip time and estimated variance 261 * are stored as fixed point numbers scaled by the values below. 262 * For convenience, these scales are also used in smoothing the average 263 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 264 * With these scales, srtt has 3 bits to the right of the binary point, 265 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 266 * binary point, and is smoothed with an ALPHA of 0.75. 267 */ 268 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 269 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 270 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 271 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 272 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 273 274 /* 275 * The initial retransmission should happen at rtt + 4 * rttvar. 276 * Because of the way we do the smoothing, srtt and rttvar 277 * will each average +1/2 tick of bias. When we compute 278 * the retransmit timer, we want 1/2 tick of rounding and 279 * 1 extra tick because of +-1/2 tick uncertainty in the 280 * firing of the timer. The bias will give us exactly the 281 * 1.5 tick we need. But, because the bias is 282 * statistical, we have to test that we don't drop below 283 * the minimum feasible timer (which is 2 ticks). 284 * This version of the macro adapted from a paper by Lawrence 285 * Brakmo and Larry Peterson which outlines a problem caused 286 * by insufficient precision in the original implementation, 287 * which results in inappropriately large RTO values for very 288 * fast networks. 289 */ 290 #define TCP_REXMTVAL(tp) \ 291 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 292 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 293 294 /* 295 * TCP statistics. 296 * Many of these should be kept per connection, 297 * but that's inconvenient at the moment. 298 */ 299 struct tcpstat { 300 u_long tcps_connattempt; /* connections initiated */ 301 u_long tcps_accepts; /* connections accepted */ 302 u_long tcps_connects; /* connections established */ 303 u_long tcps_drops; /* connections dropped */ 304 u_long tcps_conndrops; /* embryonic connections dropped */ 305 u_long tcps_closed; /* conn. closed (includes drops) */ 306 u_long tcps_segstimed; /* segs where we tried to get rtt */ 307 u_long tcps_rttupdated; /* times we succeeded */ 308 u_long tcps_delack; /* delayed acks sent */ 309 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 310 u_long tcps_rexmttimeo; /* retransmit timeouts */ 311 u_long tcps_persisttimeo; /* persist timeouts */ 312 u_long tcps_keeptimeo; /* keepalive timeouts */ 313 u_long tcps_keepprobe; /* keepalive probes sent */ 314 u_long tcps_keepdrops; /* connections dropped in keepalive */ 315 316 u_long tcps_sndtotal; /* total packets sent */ 317 u_long tcps_sndpack; /* data packets sent */ 318 u_long tcps_sndbyte; /* data bytes sent */ 319 u_long tcps_sndrexmitpack; /* data packets retransmitted */ 320 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 321 u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 322 u_long tcps_sndacks; /* ack-only packets sent */ 323 u_long tcps_sndprobe; /* window probes sent */ 324 u_long tcps_sndurg; /* packets sent with URG only */ 325 u_long tcps_sndwinup; /* window update-only packets sent */ 326 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 327 328 u_long tcps_rcvtotal; /* total packets received */ 329 u_long tcps_rcvpack; /* packets received in sequence */ 330 u_long tcps_rcvbyte; /* bytes received in sequence */ 331 u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 332 u_long tcps_rcvbadoff; /* packets received with bad offset */ 333 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 334 u_long tcps_rcvshort; /* packets received too short */ 335 u_long tcps_rcvduppack; /* duplicate-only packets received */ 336 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 337 u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 338 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 339 u_long tcps_rcvoopack; /* out-of-order packets received */ 340 u_long tcps_rcvoobyte; /* out-of-order bytes received */ 341 u_long tcps_rcvpackafterwin; /* packets with data after window */ 342 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 343 u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 344 u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 345 u_long tcps_rcvdupack; /* rcvd duplicate acks */ 346 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 347 u_long tcps_rcvackpack; /* rcvd ack packets */ 348 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 349 u_long tcps_rcvwinupd; /* rcvd window update packets */ 350 u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 351 u_long tcps_predack; /* times hdr predict ok for acks */ 352 u_long tcps_preddat; /* times hdr predict ok for data pkts */ 353 u_long tcps_pcbcachemiss; 354 u_long tcps_cachedrtt; /* times cached RTT in route updated */ 355 u_long tcps_cachedrttvar; /* times cached rttvar updated */ 356 u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 357 u_long tcps_usedrtt; /* times RTT initialized from route */ 358 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 359 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 360 u_long tcps_persistdrop; /* timeout in persist state */ 361 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 362 u_long tcps_mturesent; /* resends due to MTU discovery */ 363 u_long tcps_listendrop; /* listen queue overflows */ 364 365 u_long tcps_sc_added; /* entry added to syncache */ 366 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 367 u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 368 u_long tcps_sc_dropped; /* could not reply to packet */ 369 u_long tcps_sc_completed; /* successful extraction of entry */ 370 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 371 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 372 u_long tcps_sc_reset; /* RST removed entry from syncache */ 373 u_long tcps_sc_stale; /* timed out or listen socket gone */ 374 u_long tcps_sc_aborted; /* syncache entry aborted */ 375 u_long tcps_sc_badack; /* removed due to bad ACK */ 376 u_long tcps_sc_unreach; /* ICMP unreachable received */ 377 u_long tcps_sc_zonefail; /* zalloc() failed */ 378 u_long tcps_sc_sendcookie; /* SYN cookie sent */ 379 u_long tcps_sc_recvcookie; /* SYN cookie received */ 380 }; 381 382 /* 383 * TCB structure exported to user-land via sysctl(3). 384 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 385 * included. Not all of our clients do. 386 */ 387 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 388 struct xtcpcb { 389 size_t xt_len; 390 struct inpcb xt_inp; 391 struct tcpcb xt_tp; 392 struct xsocket xt_socket; 393 u_quad_t xt_alignment_hack; 394 }; 395 #endif 396 397 /* 398 * Names for TCP sysctl objects 399 */ 400 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 401 #define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */ 402 #define TCPCTL_MSSDFLT 3 /* MSS default */ 403 #define TCPCTL_STATS 4 /* statistics (read-only) */ 404 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 405 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 406 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 407 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 408 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 409 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 410 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 411 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 412 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 413 #define TCPCTL_MAXID 14 414 415 #define TCPCTL_NAMES { \ 416 { 0, 0 }, \ 417 { "rfc1323", CTLTYPE_INT }, \ 418 { "rfc1644", CTLTYPE_INT }, \ 419 { "mssdflt", CTLTYPE_INT }, \ 420 { "stats", CTLTYPE_STRUCT }, \ 421 { "rttdflt", CTLTYPE_INT }, \ 422 { "keepidle", CTLTYPE_INT }, \ 423 { "keepintvl", CTLTYPE_INT }, \ 424 { "sendspace", CTLTYPE_INT }, \ 425 { "recvspace", CTLTYPE_INT }, \ 426 { "keepinit", CTLTYPE_INT }, \ 427 { "pcblist", CTLTYPE_STRUCT }, \ 428 { "delacktime", CTLTYPE_INT }, \ 429 { "v6mssdflt", CTLTYPE_INT }, \ 430 } 431 432 433 #ifdef _KERNEL 434 #ifdef SYSCTL_DECL 435 SYSCTL_DECL(_net_inet_tcp); 436 #endif 437 438 extern struct inpcbhead tcb; /* head of queue of active tcpcb's */ 439 extern struct inpcbinfo tcbinfo; 440 extern struct tcpstat tcpstat; /* tcp statistics */ 441 extern int tcp_mssdflt; /* XXX */ 442 extern int tcp_delack_enabled; 443 extern int tcp_do_newreno; 444 extern int path_mtu_discovery; 445 extern int ss_fltsz; 446 extern int ss_fltsz_local; 447 448 void tcp_canceltimers(struct tcpcb *); 449 struct tcpcb * 450 tcp_close(struct tcpcb *); 451 void tcp_ctlinput(int, struct sockaddr *, void *); 452 int tcp_ctloutput(struct socket *, struct sockopt *); 453 struct tcpcb * 454 tcp_drop(struct tcpcb *, int); 455 void tcp_drain(void); 456 void tcp_fasttimo(void); 457 struct rmxp_tao * 458 tcp_gettaocache(struct in_conninfo *); 459 void tcp_init(void); 460 void tcp_input(struct mbuf *, int); 461 void tcp_mss(struct tcpcb *, int); 462 int tcp_mssopt(struct tcpcb *); 463 struct inpcb * 464 tcp_drop_syn_sent(struct inpcb *, int); 465 struct inpcb * 466 tcp_mtudisc(struct inpcb *, int); 467 struct tcpcb * 468 tcp_newtcpcb(struct inpcb *); 469 int tcp_output(struct tcpcb *); 470 struct inpcb * 471 tcp_quench(struct inpcb *, int); 472 void tcp_respond(struct tcpcb *, void *, 473 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 474 struct rtentry * 475 tcp_rtlookup(struct in_conninfo *); 476 void tcp_setpersist(struct tcpcb *); 477 void tcp_slowtimo(void); 478 struct tcptemp * 479 tcp_maketemplate(struct tcpcb *); 480 void tcp_fillheaders(struct tcpcb *, void *, void *); 481 struct tcpcb * 482 tcp_timers(struct tcpcb *, int); 483 void tcp_trace(int, int, struct tcpcb *, void *, struct tcphdr *, int); 484 void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); 485 void syncache_init(void); 486 void syncache_unreach(struct in_conninfo *, struct tcphdr *); 487 int syncache_expand(struct in_conninfo *, struct tcphdr *, 488 struct socket **, struct mbuf *); 489 int syncache_add(struct in_conninfo *, struct tcpopt *, 490 struct tcphdr *, struct socket **, struct mbuf *); 491 void syncache_chkrst(struct in_conninfo *, struct tcphdr *); 492 void syncache_badack(struct in_conninfo *); 493 494 extern struct pr_usrreqs tcp_usrreqs; 495 extern u_long tcp_sendspace; 496 extern u_long tcp_recvspace; 497 tcp_seq tcp_new_isn(struct tcpcb *); 498 499 #endif /* _KERNEL */ 500 501 #endif /* _NETINET_TCP_VAR_H_ */ 502