1 /* 2 * Copyright (c) 2003-2004 Jeffrey Hsu. All rights reserved. 3 * Copyright (c) 1982, 1986, 1993, 1994, 1995 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 35 * $FreeBSD: src/sys/netinet/tcp_var.h,v 1.56.2.13 2003/02/03 02:34:07 hsu Exp $ 36 * $DragonFly: src/sys/netinet/tcp_var.h,v 1.15 2004/03/14 08:21:53 hsu Exp $ 37 */ 38 39 #ifndef _NETINET_TCP_VAR_H_ 40 #define _NETINET_TCP_VAR_H_ 41 42 #include <netinet/in_pcb.h> /* needed for in_conninfo, inp_gen_t */ 43 44 /* 45 * Kernel variables for tcp. 46 */ 47 extern int tcp_do_rfc1323; 48 extern int tcp_do_rfc1644; 49 50 /* TCP segment queue entry */ 51 struct tseg_qent { 52 LIST_ENTRY(tseg_qent) tqe_q; 53 int tqe_len; /* TCP segment data length */ 54 struct tcphdr *tqe_th; /* a pointer to tcp header */ 55 struct mbuf *tqe_m; /* mbuf contains packet */ 56 }; 57 LIST_HEAD(tsegqe_head, tseg_qent); 58 extern int tcp_reass_maxseg; 59 extern int tcp_reass_qsize; 60 #ifdef MALLOC_DECLARE 61 MALLOC_DECLARE(M_TSEGQ); 62 #endif 63 64 struct tcptemp { 65 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 66 struct tcphdr tt_t; 67 }; 68 69 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 70 71 /* 72 * Tcp control block, one per tcp; fields: 73 * Organized for 16 byte cacheline efficiency. 74 */ 75 struct tcpcb { 76 struct tsegqe_head t_segq; 77 int t_dupacks; /* consecutive dup acks recd */ 78 struct tcptemp *unused; /* unused */ 79 80 struct callout *tt_rexmt; /* retransmit timer */ 81 struct callout *tt_persist; /* retransmit persistence */ 82 struct callout *tt_keep; /* keepalive */ 83 struct callout *tt_2msl; /* 2*msl TIME_WAIT timer */ 84 struct callout *tt_delack; /* delayed ACK timer */ 85 86 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 87 int t_state; /* state of this connection */ 88 u_int t_flags; 89 #define TF_ACKNOW 0x00000001 /* ack peer immediately */ 90 #define TF_DELACK 0x00000002 /* ack, but try to delay it */ 91 #define TF_NODELAY 0x00000004 /* don't delay packets to coalesce */ 92 #define TF_NOOPT 0x00000008 /* don't use tcp options */ 93 #define TF_SENTFIN 0x00000010 /* have sent FIN */ 94 #define TF_REQ_SCALE 0x00000020 /* have/will request window scaling */ 95 #define TF_RCVD_SCALE 0x00000040 /* other side has requested scaling */ 96 #define TF_REQ_TSTMP 0x00000080 /* have/will request timestamps */ 97 #define TF_RCVD_TSTMP 0x00000100 /* a timestamp was received in SYN */ 98 #define TF_SACK_PERMIT 0x00000200 /* other side said I could SACK */ 99 #define TF_NEEDSYN 0x00000400 /* send SYN (implicit state) */ 100 #define TF_NEEDFIN 0x00000800 /* send FIN (implicit state) */ 101 #define TF_NOPUSH 0x00001000 /* don't push */ 102 #define TF_REQ_CC 0x00002000 /* have/will request CC */ 103 #define TF_RCVD_CC 0x00004000 /* a CC was received in SYN */ 104 #define TF_SENDCCNEW 0x00008000 /* send CCnew instead of CC in SYN */ 105 #define TF_MORETOCOME 0x00010000 /* More data to be appended to sock */ 106 #define TF_LQ_OVERFLOW 0x00020000 /* listen queue overflow */ 107 #define TF_LASTIDLE 0x00040000 /* connection was previously idle */ 108 #define TF_RXWIN0SENT 0x00080000 /* sent a receiver win 0 in response */ 109 #define TF_FASTRECOVERY 0x00100000 /* in NewReno Fast Recovery */ 110 #define TF_WASFRECOVERY 0x00200000 /* was in NewReno Fast Recovery */ 111 #define TF_FIRSTACCACK 0x00400000 /* Look for 1st acceptable ACK. */ 112 #define TF_FASTREXMT 0x00800000 /* Did Fast Retransmit. */ 113 #define TF_EARLYREXMT 0x01000000 /* Did Early (Fast) Retransmit. */ 114 int t_force; /* 1 if forcing out a byte */ 115 116 tcp_seq snd_una; /* send unacknowledged */ 117 tcp_seq snd_max; /* highest sequence number sent; 118 * used to recognize retransmits 119 */ 120 tcp_seq snd_nxt; /* send next */ 121 tcp_seq snd_up; /* send urgent pointer */ 122 123 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 tcp_seq irs; /* initial receive sequence number */ 127 128 tcp_seq rcv_nxt; /* receive next */ 129 tcp_seq rcv_adv; /* advertised window */ 130 u_long rcv_wnd; /* receive window */ 131 tcp_seq rcv_up; /* receive urgent pointer */ 132 133 u_long snd_wnd; /* send window */ 134 u_long snd_cwnd; /* congestion-controlled window */ 135 u_long snd_bwnd; /* bandwidth-controlled window */ 136 u_long snd_ssthresh; /* snd_cwnd size threshold for 137 * for slow start exponential to 138 * linear switch 139 */ 140 u_long snd_bandwidth; /* calculated bandwidth or 0 */ 141 tcp_seq snd_recover; /* for use in NewReno fast recovery */ 142 143 u_int t_maxopd; /* mss plus options */ 144 145 u_long t_rcvtime; /* inactivity time */ 146 u_long t_starttime; /* time connection was established */ 147 int t_rtttime; /* round trip time */ 148 tcp_seq t_rtseq; /* sequence number being timed */ 149 150 int t_bw_rtttime; /* used for bandwidth calculation */ 151 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ 152 153 int t_rxtcur; /* current retransmit value (ticks) */ 154 u_int t_maxseg; /* maximum segment size */ 155 int t_srtt; /* smoothed round-trip time */ 156 int t_rttvar; /* variance in round-trip time */ 157 158 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 159 u_int t_rttmin; /* minimum rtt allowed */ 160 u_int t_rttbest; /* best rtt we've seen */ 161 u_long t_rttupdated; /* number of times rtt sampled */ 162 u_long max_sndwnd; /* largest window peer has offered */ 163 164 int t_softerror; /* possible error not yet reported */ 165 /* out-of-band data */ 166 char t_oobflags; /* have some */ 167 char t_iobc; /* input character */ 168 #define TCPOOB_HAVEDATA 0x01 169 #define TCPOOB_HADDATA 0x02 170 /* RFC 1323 variables */ 171 u_char snd_scale; /* window scaling for send window */ 172 u_char rcv_scale; /* window scaling for recv window */ 173 u_char request_r_scale; /* pending window scaling */ 174 u_char requested_s_scale; 175 u_long ts_recent; /* timestamp echo data */ 176 177 u_long ts_recent_age; /* when last updated */ 178 tcp_seq last_ack_sent; 179 /* RFC 1644 variables */ 180 tcp_cc cc_send; /* send connection count */ 181 tcp_cc cc_recv; /* receive connection count */ 182 /* experimental */ 183 u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 184 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 185 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 186 u_long t_badrxtwin; /* window for retransmit recovery */ 187 u_long t_rexmtTS; /* timestamp of last retransmit */ 188 u_char snd_limited; /* segments limited transmitted */ 189 }; 190 191 #define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY) 192 #define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY 193 #define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY 194 195 /* 196 * Structure to hold TCP options that are only used during segment 197 * processing (in tcp_input), but not held in the tcpcb. 198 * It's basically used to reduce the number of parameters 199 * to tcp_dooptions. 200 */ 201 struct tcpopt { 202 u_long to_flags; /* which options are present */ 203 #define TOF_TS 0x0001 /* timestamp */ 204 #define TOF_CC 0x0002 /* CC and CCnew are exclusive */ 205 #define TOF_CCNEW 0x0004 206 #define TOF_CCECHO 0x0008 207 #define TOF_MSS 0x0010 208 #define TOF_SCALE 0x0020 209 u_int32_t to_tsval; 210 u_int32_t to_tsecr; 211 tcp_cc to_cc; /* holds CC or CCnew */ 212 tcp_cc to_ccecho; 213 u_int16_t to_mss; 214 u_int8_t to_requested_s_scale; 215 u_int8_t to_pad; 216 }; 217 218 struct syncache { 219 inp_gen_t sc_inp_gencnt; /* pointer check */ 220 struct tcpcb *sc_tp; /* tcb for listening socket */ 221 struct mbuf *sc_ipopts; /* source route */ 222 struct in_conninfo sc_inc; /* addresses */ 223 #define sc_route sc_inc.inc_route 224 #define sc_route6 sc_inc.inc6_route 225 u_int32_t sc_tsrecent; 226 tcp_cc sc_cc_send; /* holds CC or CCnew */ 227 tcp_cc sc_cc_recv; 228 tcp_seq sc_irs; /* seq from peer */ 229 tcp_seq sc_iss; /* our ISS */ 230 u_long sc_rxttime; /* retransmit time */ 231 u_int16_t sc_rxtslot; /* retransmit counter */ 232 u_int16_t sc_peer_mss; /* peer's MSS */ 233 u_int16_t sc_wnd; /* advertised window */ 234 u_int8_t sc_requested_s_scale:4, 235 sc_request_r_scale:4; 236 u_int8_t sc_flags; 237 #define SCF_NOOPT 0x01 /* no TCP options */ 238 #define SCF_WINSCALE 0x02 /* negotiated window scaling */ 239 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ 240 #define SCF_CC 0x08 /* negotiated CC */ 241 #define SCF_UNREACH 0x10 /* icmp unreachable received */ 242 #define SCF_KEEPROUTE 0x20 /* keep cloned route */ 243 TAILQ_ENTRY(syncache) sc_hash; 244 TAILQ_ENTRY(syncache) sc_timerq; 245 }; 246 247 struct syncache_head { 248 TAILQ_HEAD(, syncache) sch_bucket; 249 u_int sch_length; 250 }; 251 252 /* 253 * The TAO cache entry which is stored in the protocol family specific 254 * portion of the route metrics. 255 */ 256 struct rmxp_tao { 257 tcp_cc tao_cc; /* latest CC in valid SYN */ 258 tcp_cc tao_ccsent; /* latest CC sent to peer */ 259 u_short tao_mssopt; /* peer's cached MSS */ 260 #ifdef notyet 261 u_short tao_flags; /* cache status flags */ 262 #define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */ 263 #define TAOF_OK 0x0002 /* peer does understand rfc1644 */ 264 #define TAOF_UNDEF 0 /* we don't know yet */ 265 #endif /* notyet */ 266 }; 267 #define rmx_taop(r) ((struct rmxp_tao *)(r).rmx_filler) 268 269 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 270 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 271 272 /* 273 * The smoothed round-trip time and estimated variance 274 * are stored as fixed point numbers scaled by the values below. 275 * For convenience, these scales are also used in smoothing the average 276 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 277 * With these scales, srtt has 3 bits to the right of the binary point, 278 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 279 * binary point, and is smoothed with an ALPHA of 0.75. 280 */ 281 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 282 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 283 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 284 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 285 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 286 287 /* 288 * The initial retransmission should happen at rtt + 4 * rttvar. 289 * Because of the way we do the smoothing, srtt and rttvar 290 * will each average +1/2 tick of bias. When we compute 291 * the retransmit timer, we want 1/2 tick of rounding and 292 * 1 extra tick because of +-1/2 tick uncertainty in the 293 * firing of the timer. The bias will give us exactly the 294 * 1.5 tick we need. But, because the bias is 295 * statistical, we have to test that we don't drop below 296 * the minimum feasible timer (which is 2 ticks). 297 * This version of the macro adapted from a paper by Lawrence 298 * Brakmo and Larry Peterson which outlines a problem caused 299 * by insufficient precision in the original implementation, 300 * which results in inappropriately large RTO values for very 301 * fast networks. 302 */ 303 #define TCP_REXMTVAL(tp) \ 304 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 305 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 306 307 /* 308 * TCP statistics. 309 * Many of these should be kept per connection, 310 * but that's inconvenient at the moment. 311 */ 312 struct tcpstat { 313 u_long tcps_connattempt; /* connections initiated */ 314 u_long tcps_accepts; /* connections accepted */ 315 u_long tcps_connects; /* connections established */ 316 u_long tcps_drops; /* connections dropped */ 317 u_long tcps_conndrops; /* embryonic connections dropped */ 318 u_long tcps_closed; /* conn. closed (includes drops) */ 319 u_long tcps_segstimed; /* segs where we tried to get rtt */ 320 u_long tcps_rttupdated; /* times we succeeded */ 321 u_long tcps_delack; /* delayed acks sent */ 322 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 323 u_long tcps_rexmttimeo; /* retransmit timeouts */ 324 u_long tcps_persisttimeo; /* persist timeouts */ 325 u_long tcps_keeptimeo; /* keepalive timeouts */ 326 u_long tcps_keepprobe; /* keepalive probes sent */ 327 u_long tcps_keepdrops; /* connections dropped in keepalive */ 328 329 u_long tcps_sndtotal; /* total packets sent */ 330 u_long tcps_sndpack; /* data packets sent */ 331 u_long tcps_sndbyte; /* data bytes sent */ 332 u_long tcps_sndrexmitpack; /* data packets retransmitted */ 333 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 334 u_long tcps_sndfastrexmit; /* Fast Retransmissions */ 335 u_long tcps_sndearlyrexmit; /* early Fast Retransmissions */ 336 u_long tcps_sndlimited; /* Limited Transmit packets */ 337 u_long tcps_sndrtobad; /* spurious RTO retransmissions */ 338 u_long tcps_sndfastrexmitbad; /* spurious Fast Retransmissions */ 339 u_long tcps_sndearlyrexmitbad; /* spurious early Fast Retransmissions, 340 a subset of tcps_sndfastrexmitbad */ 341 u_long tcps_eifeldetected; /* Eifel-detected spurious rexmits */ 342 u_long tcps_rttcantdetect; /* Eifel but not 1/2 RTT-detectable */ 343 u_long tcps_rttdetected; /* RTT-detected spurious RTO rexmits */ 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 #ifdef _KERNEL 455 #ifdef SYSCTL_DECL 456 SYSCTL_DECL(_net_inet_tcp); 457 #endif 458 459 extern struct inpcbinfo tcbinfo[]; 460 extern struct tcpstat tcpstat; /* tcp statistics */ 461 extern int tcp_mssdflt; /* XXX */ 462 extern int tcp_delack_enabled; 463 extern int tcp_do_newreno; 464 extern int path_mtu_discovery; 465 extern int ss_fltsz; 466 extern int ss_fltsz_local; 467 468 int tcp_addrcpu(in_addr_t faddr, in_port_t fport, 469 in_addr_t laddr, in_port_t lport); 470 void tcp_canceltimers (struct tcpcb *); 471 struct tcpcb * 472 tcp_close (struct tcpcb *); 473 void tcp_ctlinput (int, struct sockaddr *, void *); 474 int tcp_ctloutput (struct socket *, struct sockopt *); 475 struct lwkt_port * 476 tcp_cport(int cpu); 477 struct tcpcb * 478 tcp_drop (struct tcpcb *, int); 479 void tcp_drain (void); 480 void tcp_fasttimo (void); 481 struct rmxp_tao * 482 tcp_gettaocache (struct in_conninfo *); 483 void tcp_init (void); 484 void tcp_thread_init (void); 485 void tcp_input (struct mbuf *, int, int); 486 void tcp_mss (struct tcpcb *, int); 487 int tcp_mssopt (struct tcpcb *); 488 void tcp_drop_syn_sent (struct inpcb *, int); 489 void tcp_mtudisc (struct inpcb *, int); 490 struct tcpcb * 491 tcp_newtcpcb (struct inpcb *); 492 int tcp_output (struct tcpcb *); 493 void tcp_quench (struct inpcb *, int); 494 void tcp_respond (struct tcpcb *, void *, 495 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 496 struct rtentry * 497 tcp_rtlookup (struct in_conninfo *); 498 void tcp_save_congestion_state(struct tcpcb *tp); 499 void tcp_revert_congestion_state(struct tcpcb *tp); 500 void tcp_setpersist (struct tcpcb *); 501 void tcp_slowtimo (void); 502 struct tcptemp * 503 tcp_maketemplate (struct tcpcb *); 504 void tcp_fillheaders (struct tcpcb *, void *, void *); 505 struct lwkt_port * 506 tcp_soport(struct socket *, struct sockaddr *nam); 507 struct tcpcb * 508 tcp_timers (struct tcpcb *, int); 509 void tcp_trace (int, int, struct tcpcb *, void *, struct tcphdr *, 510 int); 511 void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); 512 void syncache_init(void); 513 void syncache_unreach(struct in_conninfo *, struct tcphdr *); 514 int syncache_expand(struct in_conninfo *, struct tcphdr *, 515 struct socket **, struct mbuf *); 516 int syncache_add(struct in_conninfo *, struct tcpopt *, 517 struct tcphdr *, struct socket **, struct mbuf *); 518 void syncache_chkrst(struct in_conninfo *, struct tcphdr *); 519 void syncache_badack(struct in_conninfo *); 520 521 extern struct pr_usrreqs tcp_usrreqs; 522 extern u_long tcp_sendspace; 523 extern u_long tcp_recvspace; 524 tcp_seq tcp_new_isn (struct tcpcb *); 525 526 #endif /* _KERNEL */ 527 528 #endif /* _NETINET_TCP_VAR_H_ */ 529