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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 30 * $FreeBSD$ 31 */ 32 33 #ifndef _NETINET_TCP_VAR_H_ 34 #define _NETINET_TCP_VAR_H_ 35 36 #include <netinet/tcp.h> 37 38 /* 39 * Kernel variables for tcp. 40 */ 41 extern int tcp_do_rfc1323; 42 extern int tcp_do_rfc1644; 43 44 /* TCP segment queue entry */ 45 struct tseg_qent { 46 LIST_ENTRY(tseg_qent) tqe_q; 47 int tqe_len; /* TCP segment data length */ 48 struct tcphdr *tqe_th; /* a pointer to tcp header */ 49 struct mbuf *tqe_m; /* mbuf contains packet */ 50 }; 51 LIST_HEAD(tsegqe_head, tseg_qent); 52 extern int tcp_reass_qsize; 53 extern struct uma_zone *tcp_reass_zone; 54 55 struct tcptemp { 56 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 57 struct tcphdr tt_t; 58 }; 59 60 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 61 62 /* 63 * Tcp control block, one per tcp; fields: 64 * Organized for 16 byte cacheline efficiency. 65 */ 66 struct tcpcb { 67 struct tsegqe_head t_segq; /* segment reassembly queue */ 68 int t_segqlen; /* segment reassembly queue length */ 69 int t_dupacks; /* consecutive dup acks recd */ 70 struct tcptemp *unused; /* unused */ 71 72 struct callout *tt_rexmt; /* retransmit timer */ 73 struct callout *tt_persist; /* retransmit persistence */ 74 struct callout *tt_keep; /* keepalive */ 75 struct callout *tt_2msl; /* 2*msl TIME_WAIT timer */ 76 struct callout *tt_delack; /* delayed ACK timer */ 77 78 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 79 int t_state; /* state of this connection */ 80 u_int t_flags; 81 #define TF_ACKNOW 0x000001 /* ack peer immediately */ 82 #define TF_DELACK 0x000002 /* ack, but try to delay it */ 83 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 84 #define TF_NOOPT 0x000008 /* don't use tcp options */ 85 #define TF_SENTFIN 0x000010 /* have sent FIN */ 86 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 87 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 88 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 89 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 90 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 91 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 92 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 93 #define TF_NOPUSH 0x001000 /* don't push */ 94 #define TF_REQ_CC 0x002000 /* have/will request CC */ 95 #define TF_RCVD_CC 0x004000 /* a CC was received in SYN */ 96 #define TF_SENDCCNEW 0x008000 /* send CCnew instead of CC in SYN */ 97 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 98 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 99 #define TF_LASTIDLE 0x040000 /* connection was previously idle */ 100 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 101 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 102 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 103 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 104 int t_force; /* 1 if forcing out a byte */ 105 106 tcp_seq snd_una; /* send unacknowledged */ 107 tcp_seq snd_max; /* highest sequence number sent; 108 * used to recognize retransmits 109 */ 110 tcp_seq snd_nxt; /* send next */ 111 tcp_seq snd_up; /* send urgent pointer */ 112 113 tcp_seq snd_wl1; /* window update seg seq number */ 114 tcp_seq snd_wl2; /* window update seg ack number */ 115 tcp_seq iss; /* initial send sequence number */ 116 tcp_seq irs; /* initial receive sequence number */ 117 118 tcp_seq rcv_nxt; /* receive next */ 119 tcp_seq rcv_adv; /* advertised window */ 120 u_long rcv_wnd; /* receive window */ 121 tcp_seq rcv_up; /* receive urgent pointer */ 122 123 u_long snd_wnd; /* send window */ 124 u_long snd_cwnd; /* congestion-controlled window */ 125 u_long snd_bwnd; /* bandwidth-controlled window */ 126 u_long snd_ssthresh; /* snd_cwnd size threshold for 127 * for slow start exponential to 128 * linear switch 129 */ 130 u_long snd_bandwidth; /* calculated bandwidth or 0 */ 131 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 132 133 u_int t_maxopd; /* mss plus options */ 134 135 u_long t_rcvtime; /* inactivity time */ 136 u_long t_starttime; /* time connection was established */ 137 int t_rtttime; /* round trip time */ 138 tcp_seq t_rtseq; /* sequence number being timed */ 139 140 int t_bw_rtttime; /* used for bandwidth calculation */ 141 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ 142 143 int t_rxtcur; /* current retransmit value (ticks) */ 144 u_int t_maxseg; /* maximum segment size */ 145 int t_srtt; /* smoothed round-trip time */ 146 int t_rttvar; /* variance in round-trip time */ 147 148 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 149 u_int t_rttmin; /* minimum rtt allowed */ 150 u_int t_rttbest; /* best rtt we've seen */ 151 u_long t_rttupdated; /* number of times rtt sampled */ 152 u_long max_sndwnd; /* largest window peer has offered */ 153 154 int t_softerror; /* possible error not yet reported */ 155 /* out-of-band data */ 156 char t_oobflags; /* have some */ 157 char t_iobc; /* input character */ 158 #define TCPOOB_HAVEDATA 0x01 159 #define TCPOOB_HADDATA 0x02 160 /* RFC 1323 variables */ 161 u_char snd_scale; /* window scaling for send window */ 162 u_char rcv_scale; /* window scaling for recv window */ 163 u_char request_r_scale; /* pending window scaling */ 164 u_char requested_s_scale; 165 u_long ts_recent; /* timestamp echo data */ 166 167 u_long ts_recent_age; /* when last updated */ 168 tcp_seq last_ack_sent; 169 /* RFC 1644 variables */ 170 tcp_cc cc_send; /* send connection count */ 171 tcp_cc cc_recv; /* receive connection count */ 172 /* experimental */ 173 u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 174 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 175 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 176 u_long t_badrxtwin; /* window for retransmit recovery */ 177 u_char snd_limited; /* segments limited transmitted */ 178 /* anti DoS counters */ 179 u_long rcv_second; /* start of interval second */ 180 u_long rcv_pps; /* received packets per second */ 181 u_long rcv_byps; /* received bytes per second */ 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 #ifdef TCP_SIGNATURE 189 /* 190 * Defines which are needed by the xform_tcp module and tcp_[in|out]put 191 * for SADB verification and lookup. 192 */ 193 #define TCP_SIGLEN 16 /* length of computed digest in bytes */ 194 #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */ 195 #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */ 196 /* 197 * Only a single SA per host may be specified at this time. An SPI is 198 * needed in order for the KEY_ALLOCSA() lookup to work. 199 */ 200 #define TCP_SIG_SPI 0x1000 201 #endif /* TCP_SIGNATURE */ 202 203 /* 204 * Structure to hold TCP options that are only used during segment 205 * processing (in tcp_input), but not held in the tcpcb. 206 * It's basically used to reduce the number of parameters 207 * to tcp_dooptions. 208 */ 209 struct tcpopt { 210 u_long to_flags; /* which options are present */ 211 #define TOF_TS 0x0001 /* timestamp */ 212 #define TOF_CC 0x0002 /* CC and CCnew are exclusive */ 213 #define TOF_CCNEW 0x0004 214 #define TOF_CCECHO 0x0008 215 #define TOF_MSS 0x0010 216 #define TOF_SCALE 0x0020 217 #define TOF_SIGNATURE 0x0040 /* signature option present */ 218 #define TOF_SIGLEN 0x0080 /* signature length valid (RFC2385) */ 219 u_int32_t to_tsval; 220 u_int32_t to_tsecr; 221 tcp_cc to_cc; /* holds CC or CCnew */ 222 tcp_cc to_ccecho; 223 u_int16_t to_mss; 224 u_int8_t to_requested_s_scale; 225 u_int8_t to_pad; 226 }; 227 228 #ifdef _NETINET_IN_PCB_H_ 229 struct syncache { 230 inp_gen_t sc_inp_gencnt; /* pointer check */ 231 struct tcpcb *sc_tp; /* tcb for listening socket */ 232 struct mbuf *sc_ipopts; /* source route */ 233 struct in_conninfo sc_inc; /* addresses */ 234 u_int32_t sc_tsrecent; 235 tcp_cc sc_cc_send; /* holds CC or CCnew */ 236 tcp_cc sc_cc_recv; 237 tcp_seq sc_irs; /* seq from peer */ 238 tcp_seq sc_iss; /* our ISS */ 239 u_long sc_rxttime; /* retransmit time */ 240 u_int16_t sc_rxtslot; /* retransmit counter */ 241 u_int16_t sc_peer_mss; /* peer's MSS */ 242 u_int16_t sc_wnd; /* advertised window */ 243 u_int8_t sc_requested_s_scale:4, 244 sc_request_r_scale:4; 245 u_int8_t sc_flags; 246 #define SCF_NOOPT 0x01 /* no TCP options */ 247 #define SCF_WINSCALE 0x02 /* negotiated window scaling */ 248 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ 249 #define SCF_CC 0x08 /* negotiated CC */ 250 #define SCF_UNREACH 0x10 /* icmp unreachable received */ 251 #define SCF_SIGNATURE 0x20 /* send MD5 digests */ 252 TAILQ_ENTRY(syncache) sc_hash; 253 TAILQ_ENTRY(syncache) sc_timerq; 254 }; 255 256 struct syncache_head { 257 TAILQ_HEAD(, syncache) sch_bucket; 258 u_int sch_length; 259 }; 260 #else 261 struct in_conninfo; 262 #endif /* _NETINET_IN_PCB_H_ */ 263 264 struct hc_metrics_lite { /* must stay in sync with hc_metrics */ 265 u_long rmx_mtu; /* MTU for this path */ 266 u_long rmx_ssthresh; /* outbound gateway buffer limit */ 267 u_long rmx_rtt; /* estimated round trip time */ 268 u_long rmx_rttvar; /* estimated rtt variance */ 269 u_long rmx_bandwidth; /* estimated bandwidth */ 270 u_long rmx_cwnd; /* congestion window */ 271 u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 272 u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 273 }; 274 275 struct tcptw { 276 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 277 tcp_seq snd_nxt; 278 tcp_seq rcv_nxt; 279 tcp_seq iss; 280 tcp_seq irs; 281 tcp_cc cc_recv; 282 tcp_cc cc_send; 283 u_short last_win; /* cached window value */ 284 u_short tw_so_options; /* copy of so_options */ 285 struct ucred *tw_cred; /* user credentials */ 286 u_long t_recent; 287 u_long t_starttime; 288 int tw_time; 289 LIST_ENTRY(tcptw) tw_2msl; 290 }; 291 292 /* 293 * The TAO cache entry which is stored in the tcp hostcache. 294 */ 295 struct rmxp_tao { 296 tcp_cc tao_cc; /* latest CC in valid SYN */ 297 tcp_cc tao_ccsent; /* latest CC sent to peer */ 298 u_short tao_mssopt; /* peer's cached MSS */ 299 #ifdef notyet 300 u_short tao_flags; /* cache status flags */ 301 #define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */ 302 #define TAOF_OK 0x0002 /* peer does understand rfc1644 */ 303 #define TAOF_UNDEF 0 /* we don't know yet */ 304 #endif /* notyet */ 305 }; 306 307 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 308 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 309 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 310 311 /* 312 * The smoothed round-trip time and estimated variance 313 * are stored as fixed point numbers scaled by the values below. 314 * For convenience, these scales are also used in smoothing the average 315 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 316 * With these scales, srtt has 3 bits to the right of the binary point, 317 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 318 * binary point, and is smoothed with an ALPHA of 0.75. 319 */ 320 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 321 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 322 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 323 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 324 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 325 326 /* 327 * The initial retransmission should happen at rtt + 4 * rttvar. 328 * Because of the way we do the smoothing, srtt and rttvar 329 * will each average +1/2 tick of bias. When we compute 330 * the retransmit timer, we want 1/2 tick of rounding and 331 * 1 extra tick because of +-1/2 tick uncertainty in the 332 * firing of the timer. The bias will give us exactly the 333 * 1.5 tick we need. But, because the bias is 334 * statistical, we have to test that we don't drop below 335 * the minimum feasible timer (which is 2 ticks). 336 * This version of the macro adapted from a paper by Lawrence 337 * Brakmo and Larry Peterson which outlines a problem caused 338 * by insufficient precision in the original implementation, 339 * which results in inappropriately large RTO values for very 340 * fast networks. 341 */ 342 #define TCP_REXMTVAL(tp) \ 343 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 344 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 345 346 /* 347 * TCP statistics. 348 * Many of these should be kept per connection, 349 * but that's inconvenient at the moment. 350 */ 351 struct tcpstat { 352 u_long tcps_connattempt; /* connections initiated */ 353 u_long tcps_accepts; /* connections accepted */ 354 u_long tcps_connects; /* connections established */ 355 u_long tcps_drops; /* connections dropped */ 356 u_long tcps_conndrops; /* embryonic connections dropped */ 357 u_long tcps_minmssdrops; /* average minmss too low drops */ 358 u_long tcps_closed; /* conn. closed (includes drops) */ 359 u_long tcps_segstimed; /* segs where we tried to get rtt */ 360 u_long tcps_rttupdated; /* times we succeeded */ 361 u_long tcps_delack; /* delayed acks sent */ 362 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 363 u_long tcps_rexmttimeo; /* retransmit timeouts */ 364 u_long tcps_persisttimeo; /* persist timeouts */ 365 u_long tcps_keeptimeo; /* keepalive timeouts */ 366 u_long tcps_keepprobe; /* keepalive probes sent */ 367 u_long tcps_keepdrops; /* connections dropped in keepalive */ 368 369 u_long tcps_sndtotal; /* total packets sent */ 370 u_long tcps_sndpack; /* data packets sent */ 371 u_long tcps_sndbyte; /* data bytes sent */ 372 u_long tcps_sndrexmitpack; /* data packets retransmitted */ 373 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 374 u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 375 u_long tcps_sndacks; /* ack-only packets sent */ 376 u_long tcps_sndprobe; /* window probes sent */ 377 u_long tcps_sndurg; /* packets sent with URG only */ 378 u_long tcps_sndwinup; /* window update-only packets sent */ 379 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 380 381 u_long tcps_rcvtotal; /* total packets received */ 382 u_long tcps_rcvpack; /* packets received in sequence */ 383 u_long tcps_rcvbyte; /* bytes received in sequence */ 384 u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 385 u_long tcps_rcvbadoff; /* packets received with bad offset */ 386 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 387 u_long tcps_rcvshort; /* packets received too short */ 388 u_long tcps_rcvduppack; /* duplicate-only packets received */ 389 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 390 u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 391 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 392 u_long tcps_rcvoopack; /* out-of-order packets received */ 393 u_long tcps_rcvoobyte; /* out-of-order bytes received */ 394 u_long tcps_rcvpackafterwin; /* packets with data after window */ 395 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 396 u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 397 u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 398 u_long tcps_rcvdupack; /* rcvd duplicate acks */ 399 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 400 u_long tcps_rcvackpack; /* rcvd ack packets */ 401 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 402 u_long tcps_rcvwinupd; /* rcvd window update packets */ 403 u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 404 u_long tcps_predack; /* times hdr predict ok for acks */ 405 u_long tcps_preddat; /* times hdr predict ok for data pkts */ 406 u_long tcps_pcbcachemiss; 407 u_long tcps_cachedrtt; /* times cached RTT in route updated */ 408 u_long tcps_cachedrttvar; /* times cached rttvar updated */ 409 u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 410 u_long tcps_usedrtt; /* times RTT initialized from route */ 411 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 412 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 413 u_long tcps_persistdrop; /* timeout in persist state */ 414 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 415 u_long tcps_mturesent; /* resends due to MTU discovery */ 416 u_long tcps_listendrop; /* listen queue overflows */ 417 u_long tcps_badrst; /* ignored RSTs in the window */ 418 419 u_long tcps_sc_added; /* entry added to syncache */ 420 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 421 u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 422 u_long tcps_sc_dropped; /* could not reply to packet */ 423 u_long tcps_sc_completed; /* successful extraction of entry */ 424 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 425 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 426 u_long tcps_sc_reset; /* RST removed entry from syncache */ 427 u_long tcps_sc_stale; /* timed out or listen socket gone */ 428 u_long tcps_sc_aborted; /* syncache entry aborted */ 429 u_long tcps_sc_badack; /* removed due to bad ACK */ 430 u_long tcps_sc_unreach; /* ICMP unreachable received */ 431 u_long tcps_sc_zonefail; /* zalloc() failed */ 432 u_long tcps_sc_sendcookie; /* SYN cookie sent */ 433 u_long tcps_sc_recvcookie; /* SYN cookie received */ 434 435 u_long tcps_hc_added; /* entry added to hostcache */ 436 u_long tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */ 437 }; 438 439 /* 440 * TCB structure exported to user-land via sysctl(3). 441 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 442 * included. Not all of our clients do. 443 */ 444 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 445 struct xtcpcb { 446 size_t xt_len; 447 struct inpcb xt_inp; 448 struct tcpcb xt_tp; 449 struct xsocket xt_socket; 450 u_quad_t xt_alignment_hack; 451 }; 452 #endif 453 454 /* 455 * Names for TCP sysctl objects 456 */ 457 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 458 #define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */ 459 #define TCPCTL_MSSDFLT 3 /* MSS default */ 460 #define TCPCTL_STATS 4 /* statistics (read-only) */ 461 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 462 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 463 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 464 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 465 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 466 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 467 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 468 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 469 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 470 #define TCPCTL_MAXID 14 471 472 #define TCPCTL_NAMES { \ 473 { 0, 0 }, \ 474 { "rfc1323", CTLTYPE_INT }, \ 475 { "rfc1644", CTLTYPE_INT }, \ 476 { "mssdflt", CTLTYPE_INT }, \ 477 { "stats", CTLTYPE_STRUCT }, \ 478 { "rttdflt", CTLTYPE_INT }, \ 479 { "keepidle", CTLTYPE_INT }, \ 480 { "keepintvl", CTLTYPE_INT }, \ 481 { "sendspace", CTLTYPE_INT }, \ 482 { "recvspace", CTLTYPE_INT }, \ 483 { "keepinit", CTLTYPE_INT }, \ 484 { "pcblist", CTLTYPE_STRUCT }, \ 485 { "delacktime", CTLTYPE_INT }, \ 486 { "v6mssdflt", CTLTYPE_INT }, \ 487 { "maxid", CTLTYPE_INT }, \ 488 } 489 490 491 #ifdef _KERNEL 492 #ifdef SYSCTL_DECL 493 SYSCTL_DECL(_net_inet_tcp); 494 #endif 495 496 extern struct inpcbhead tcb; /* head of queue of active tcpcb's */ 497 extern struct inpcbinfo tcbinfo; 498 extern struct tcpstat tcpstat; /* tcp statistics */ 499 extern int tcp_mssdflt; /* XXX */ 500 extern int tcp_minmss; 501 extern int tcp_minmssoverload; 502 extern int tcp_delack_enabled; 503 extern int tcp_do_newreno; 504 extern int path_mtu_discovery; 505 extern int ss_fltsz; 506 extern int ss_fltsz_local; 507 508 void tcp_canceltimers(struct tcpcb *); 509 struct tcpcb * 510 tcp_close(struct tcpcb *); 511 void tcp_twstart(struct tcpcb *); 512 int tcp_twrecycleable(struct tcptw *tw); 513 struct tcptw * 514 tcp_twclose(struct tcptw *_tw, int _reuse); 515 void tcp_ctlinput(int, struct sockaddr *, void *); 516 int tcp_ctloutput(struct socket *, struct sockopt *); 517 struct tcpcb * 518 tcp_drop(struct tcpcb *, int); 519 void tcp_drain(void); 520 void tcp_fasttimo(void); 521 void tcp_init(void); 522 void tcp_fini(void *); 523 void tcp_reass_init(void); 524 void tcp_input(struct mbuf *, int); 525 u_long tcp_maxmtu(struct in_conninfo *); 526 u_long tcp_maxmtu6(struct in_conninfo *); 527 void tcp_mss(struct tcpcb *, int); 528 int tcp_mssopt(struct in_conninfo *); 529 struct inpcb * 530 tcp_drop_syn_sent(struct inpcb *, int); 531 struct inpcb * 532 tcp_mtudisc(struct inpcb *, int); 533 struct tcpcb * 534 tcp_newtcpcb(struct inpcb *); 535 int tcp_output(struct tcpcb *); 536 struct inpcb * 537 tcp_quench(struct inpcb *, int); 538 void tcp_respond(struct tcpcb *, void *, 539 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 540 int tcp_twrespond(struct tcptw *, int); 541 void tcp_setpersist(struct tcpcb *); 542 #ifdef TCP_SIGNATURE 543 int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int); 544 #endif 545 void tcp_slowtimo(void); 546 struct tcptemp * 547 tcpip_maketemplate(struct inpcb *); 548 void tcpip_fillheaders(struct inpcb *, void *, void *); 549 struct tcpcb * 550 tcp_timers(struct tcpcb *, int); 551 void tcp_trace(int, int, struct tcpcb *, void *, struct tcphdr *, int); 552 void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); 553 void syncache_init(void); 554 void syncache_unreach(struct in_conninfo *, struct tcphdr *); 555 int syncache_expand(struct in_conninfo *, struct tcphdr *, 556 struct socket **, struct mbuf *); 557 int syncache_add(struct in_conninfo *, struct tcpopt *, 558 struct tcphdr *, struct socket **, struct mbuf *); 559 void syncache_chkrst(struct in_conninfo *, struct tcphdr *); 560 void syncache_badack(struct in_conninfo *); 561 /* 562 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 563 */ 564 void tcp_hc_init(void); 565 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 566 u_long tcp_hc_getmtu(struct in_conninfo *); 567 void tcp_hc_gettao(struct in_conninfo *, struct rmxp_tao *); 568 void tcp_hc_updatemtu(struct in_conninfo *, u_long); 569 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 570 void tcp_hc_updatetao(struct in_conninfo *, int, tcp_cc, u_short); 571 /* update which tao field */ 572 #define TCP_HC_TAO_CC 0x1 573 #define TCP_HC_TAO_CCSENT 0x2 574 #define TCP_HC_TAO_MSSOPT 0x3 575 576 extern struct pr_usrreqs tcp_usrreqs; 577 extern u_long tcp_sendspace; 578 extern u_long tcp_recvspace; 579 tcp_seq tcp_new_isn(struct tcpcb *); 580 581 #endif /* _KERNEL */ 582 583 #endif /* _NETINET_TCP_VAR_H_ */ 584