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 43 /* TCP segment queue entry */ 44 struct tseg_qent { 45 LIST_ENTRY(tseg_qent) tqe_q; 46 int tqe_len; /* TCP segment data length */ 47 struct tcphdr *tqe_th; /* a pointer to tcp header */ 48 struct mbuf *tqe_m; /* mbuf contains packet */ 49 }; 50 LIST_HEAD(tsegqe_head, tseg_qent); 51 extern int tcp_reass_qsize; 52 extern struct uma_zone *tcp_reass_zone; 53 54 struct sackblk { 55 tcp_seq start; /* start seq no. of sack block */ 56 tcp_seq end; /* end seq no. */ 57 }; 58 59 struct sackhole { 60 tcp_seq start; /* start seq no. of hole */ 61 tcp_seq end; /* end seq no. */ 62 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ 63 struct sackhole *next; /* next in list */ 64 }; 65 66 struct tcptemp { 67 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 68 struct tcphdr tt_t; 69 }; 70 71 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 72 73 /* 74 * Tcp control block, one per tcp; fields: 75 * Organized for 16 byte cacheline efficiency. 76 */ 77 struct tcpcb { 78 struct tsegqe_head t_segq; /* segment reassembly queue */ 79 int t_segqlen; /* segment reassembly queue length */ 80 int t_dupacks; /* consecutive dup acks recd */ 81 82 struct callout *tt_rexmt; /* retransmit timer */ 83 struct callout *tt_persist; /* retransmit persistence */ 84 struct callout *tt_keep; /* keepalive */ 85 struct callout *tt_2msl; /* 2*msl TIME_WAIT timer */ 86 struct callout *tt_delack; /* delayed ACK timer */ 87 88 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 89 int t_state; /* state of this connection */ 90 u_int t_flags; 91 #define TF_ACKNOW 0x000001 /* ack peer immediately */ 92 #define TF_DELACK 0x000002 /* ack, but try to delay it */ 93 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 94 #define TF_NOOPT 0x000008 /* don't use tcp options */ 95 #define TF_SENTFIN 0x000010 /* have sent FIN */ 96 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 97 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 98 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 99 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 100 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 101 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 102 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 103 #define TF_NOPUSH 0x001000 /* don't push */ 104 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 105 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 106 #define TF_LASTIDLE 0x040000 /* connection was previously idle */ 107 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 108 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 109 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 110 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 111 int t_force; /* 1 if forcing out a byte */ 112 113 tcp_seq snd_una; /* send unacknowledged */ 114 tcp_seq snd_max; /* highest sequence number sent; 115 * used to recognize retransmits 116 */ 117 tcp_seq snd_nxt; /* send next */ 118 tcp_seq snd_up; /* send urgent pointer */ 119 120 tcp_seq snd_wl1; /* window update seg seq number */ 121 tcp_seq snd_wl2; /* window update seg ack number */ 122 tcp_seq iss; /* initial send sequence number */ 123 tcp_seq irs; /* initial receive sequence number */ 124 125 tcp_seq rcv_nxt; /* receive next */ 126 tcp_seq rcv_adv; /* advertised window */ 127 u_long rcv_wnd; /* receive window */ 128 tcp_seq rcv_up; /* receive urgent pointer */ 129 130 u_long snd_wnd; /* send window */ 131 u_long snd_cwnd; /* congestion-controlled window */ 132 u_long snd_bwnd; /* bandwidth-controlled window */ 133 u_long snd_ssthresh; /* snd_cwnd size threshold for 134 * for slow start exponential to 135 * linear switch 136 */ 137 u_long snd_bandwidth; /* calculated bandwidth or 0 */ 138 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 139 140 u_int t_maxopd; /* mss plus options */ 141 142 u_long t_rcvtime; /* inactivity time */ 143 u_long t_starttime; /* time connection was established */ 144 int t_rtttime; /* round trip time */ 145 tcp_seq t_rtseq; /* sequence number being timed */ 146 147 int t_bw_rtttime; /* used for bandwidth calculation */ 148 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ 149 150 int t_rxtcur; /* current retransmit value (ticks) */ 151 u_int t_maxseg; /* maximum segment size */ 152 int t_srtt; /* smoothed round-trip time */ 153 int t_rttvar; /* variance in round-trip time */ 154 155 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 156 u_int t_rttmin; /* minimum rtt allowed */ 157 u_int t_rttbest; /* best rtt we've seen */ 158 u_long t_rttupdated; /* number of times rtt sampled */ 159 u_long max_sndwnd; /* largest window peer has offered */ 160 161 int t_softerror; /* possible error not yet reported */ 162 /* out-of-band data */ 163 char t_oobflags; /* have some */ 164 char t_iobc; /* input character */ 165 #define TCPOOB_HAVEDATA 0x01 166 #define TCPOOB_HADDATA 0x02 167 /* RFC 1323 variables */ 168 u_char snd_scale; /* window scaling for send window */ 169 u_char rcv_scale; /* window scaling for recv window */ 170 u_char request_r_scale; /* pending window scaling */ 171 u_char requested_s_scale; 172 u_long ts_recent; /* timestamp echo data */ 173 174 u_long ts_recent_age; /* when last updated */ 175 tcp_seq last_ack_sent; 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 /* anti DoS counters */ 183 u_long rcv_second; /* start of interval second */ 184 u_long rcv_pps; /* received packets per second */ 185 u_long rcv_byps; /* received bytes per second */ 186 /* SACK related state */ 187 int sack_enable; /* enable SACK for this connection */ 188 int snd_numholes; /* number of holes seen by sender */ 189 struct sackhole *snd_holes; /* linked list of holes (sorted) */ 190 tcp_seq rcv_laststart; /* start of last segment recd. */ 191 tcp_seq rcv_lastend; /* end of ... */ 192 tcp_seq rcv_lastsack; /* last seq number(+1) sack'd by rcv'r*/ 193 int rcv_numsacks; /* # distinct sack blks present */ 194 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 195 tcp_seq sack_newdata; /* New data xmitted in this recovery 196 episode starts at this seq number */ 197 }; 198 199 #define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY) 200 #define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY 201 #define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY 202 203 #ifdef TCP_SIGNATURE 204 /* 205 * Defines which are needed by the xform_tcp module and tcp_[in|out]put 206 * for SADB verification and lookup. 207 */ 208 #define TCP_SIGLEN 16 /* length of computed digest in bytes */ 209 #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */ 210 #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */ 211 /* 212 * Only a single SA per host may be specified at this time. An SPI is 213 * needed in order for the KEY_ALLOCSA() lookup to work. 214 */ 215 #define TCP_SIG_SPI 0x1000 216 #endif /* TCP_SIGNATURE */ 217 218 /* 219 * Structure to hold TCP options that are only used during segment 220 * processing (in tcp_input), but not held in the tcpcb. 221 * It's basically used to reduce the number of parameters 222 * to tcp_dooptions. 223 */ 224 struct tcpopt { 225 u_long to_flags; /* which options are present */ 226 #define TOF_TS 0x0001 /* timestamp */ 227 #define TOF_MSS 0x0010 228 #define TOF_SCALE 0x0020 229 #define TOF_SIGNATURE 0x0040 /* signature option present */ 230 #define TOF_SIGLEN 0x0080 /* signature length valid (RFC2385) */ 231 #define TOF_SACK 0x0100 /* Peer sent SACK option */ 232 u_int32_t to_tsval; 233 u_int32_t to_tsecr; 234 u_int16_t to_mss; 235 u_int8_t to_requested_s_scale; 236 u_int8_t to_pad; 237 }; 238 239 #ifdef _NETINET_IN_PCB_H_ 240 struct syncache { 241 inp_gen_t sc_inp_gencnt; /* pointer check */ 242 struct tcpcb *sc_tp; /* tcb for listening socket */ 243 struct mbuf *sc_ipopts; /* source route */ 244 struct in_conninfo sc_inc; /* addresses */ 245 u_int32_t sc_tsrecent; 246 u_int32_t sc_flowlabel; /* IPv6 flowlabel */ 247 tcp_seq sc_irs; /* seq from peer */ 248 tcp_seq sc_iss; /* our ISS */ 249 u_long sc_rxttime; /* retransmit time */ 250 u_int16_t sc_rxtslot; /* retransmit counter */ 251 u_int16_t sc_peer_mss; /* peer's MSS */ 252 u_int16_t sc_wnd; /* advertised window */ 253 u_int8_t sc_requested_s_scale:4, 254 sc_request_r_scale:4; 255 u_int8_t sc_flags; 256 #define SCF_NOOPT 0x01 /* no TCP options */ 257 #define SCF_WINSCALE 0x02 /* negotiated window scaling */ 258 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ 259 #define SCF_UNREACH 0x10 /* icmp unreachable received */ 260 #define SCF_SIGNATURE 0x20 /* send MD5 digests */ 261 #define SCF_SACK 0x80 /* send SACK option */ 262 TAILQ_ENTRY(syncache) sc_hash; 263 TAILQ_ENTRY(syncache) sc_timerq; 264 }; 265 266 struct syncache_head { 267 TAILQ_HEAD(, syncache) sch_bucket; 268 u_int sch_length; 269 }; 270 #else 271 struct in_conninfo; 272 #endif /* _NETINET_IN_PCB_H_ */ 273 274 struct hc_metrics_lite { /* must stay in sync with hc_metrics */ 275 u_long rmx_mtu; /* MTU for this path */ 276 u_long rmx_ssthresh; /* outbound gateway buffer limit */ 277 u_long rmx_rtt; /* estimated round trip time */ 278 u_long rmx_rttvar; /* estimated rtt variance */ 279 u_long rmx_bandwidth; /* estimated bandwidth */ 280 u_long rmx_cwnd; /* congestion window */ 281 u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 282 u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 283 }; 284 285 struct tcptw { 286 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 287 tcp_seq snd_nxt; 288 tcp_seq rcv_nxt; 289 tcp_seq iss; 290 tcp_seq irs; 291 u_short last_win; /* cached window value */ 292 u_short tw_so_options; /* copy of so_options */ 293 struct ucred *tw_cred; /* user credentials */ 294 u_long t_recent; 295 u_long t_starttime; 296 int tw_time; 297 LIST_ENTRY(tcptw) tw_2msl; 298 }; 299 300 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 301 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 302 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 303 304 /* 305 * The smoothed round-trip time and estimated variance 306 * are stored as fixed point numbers scaled by the values below. 307 * For convenience, these scales are also used in smoothing the average 308 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 309 * With these scales, srtt has 3 bits to the right of the binary point, 310 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 311 * binary point, and is smoothed with an ALPHA of 0.75. 312 */ 313 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 314 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 315 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 316 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 317 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 318 319 /* 320 * The initial retransmission should happen at rtt + 4 * rttvar. 321 * Because of the way we do the smoothing, srtt and rttvar 322 * will each average +1/2 tick of bias. When we compute 323 * the retransmit timer, we want 1/2 tick of rounding and 324 * 1 extra tick because of +-1/2 tick uncertainty in the 325 * firing of the timer. The bias will give us exactly the 326 * 1.5 tick we need. But, because the bias is 327 * statistical, we have to test that we don't drop below 328 * the minimum feasible timer (which is 2 ticks). 329 * This version of the macro adapted from a paper by Lawrence 330 * Brakmo and Larry Peterson which outlines a problem caused 331 * by insufficient precision in the original implementation, 332 * which results in inappropriately large RTO values for very 333 * fast networks. 334 */ 335 #define TCP_REXMTVAL(tp) \ 336 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 337 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 338 339 /* 340 * TCP statistics. 341 * Many of these should be kept per connection, 342 * but that's inconvenient at the moment. 343 */ 344 struct tcpstat { 345 u_long tcps_connattempt; /* connections initiated */ 346 u_long tcps_accepts; /* connections accepted */ 347 u_long tcps_connects; /* connections established */ 348 u_long tcps_drops; /* connections dropped */ 349 u_long tcps_conndrops; /* embryonic connections dropped */ 350 u_long tcps_minmssdrops; /* average minmss too low drops */ 351 u_long tcps_closed; /* conn. closed (includes drops) */ 352 u_long tcps_segstimed; /* segs where we tried to get rtt */ 353 u_long tcps_rttupdated; /* times we succeeded */ 354 u_long tcps_delack; /* delayed acks sent */ 355 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 356 u_long tcps_rexmttimeo; /* retransmit timeouts */ 357 u_long tcps_persisttimeo; /* persist timeouts */ 358 u_long tcps_keeptimeo; /* keepalive timeouts */ 359 u_long tcps_keepprobe; /* keepalive probes sent */ 360 u_long tcps_keepdrops; /* connections dropped in keepalive */ 361 362 u_long tcps_sndtotal; /* total packets sent */ 363 u_long tcps_sndpack; /* data packets sent */ 364 u_long tcps_sndbyte; /* data bytes sent */ 365 u_long tcps_sndrexmitpack; /* data packets retransmitted */ 366 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 367 u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 368 u_long tcps_sndacks; /* ack-only packets sent */ 369 u_long tcps_sndprobe; /* window probes sent */ 370 u_long tcps_sndurg; /* packets sent with URG only */ 371 u_long tcps_sndwinup; /* window update-only packets sent */ 372 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 373 374 u_long tcps_rcvtotal; /* total packets received */ 375 u_long tcps_rcvpack; /* packets received in sequence */ 376 u_long tcps_rcvbyte; /* bytes received in sequence */ 377 u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 378 u_long tcps_rcvbadoff; /* packets received with bad offset */ 379 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 380 u_long tcps_rcvshort; /* packets received too short */ 381 u_long tcps_rcvduppack; /* duplicate-only packets received */ 382 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 383 u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 384 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 385 u_long tcps_rcvoopack; /* out-of-order packets received */ 386 u_long tcps_rcvoobyte; /* out-of-order bytes received */ 387 u_long tcps_rcvpackafterwin; /* packets with data after window */ 388 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 389 u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 390 u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 391 u_long tcps_rcvdupack; /* rcvd duplicate acks */ 392 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 393 u_long tcps_rcvackpack; /* rcvd ack packets */ 394 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 395 u_long tcps_rcvwinupd; /* rcvd window update packets */ 396 u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 397 u_long tcps_predack; /* times hdr predict ok for acks */ 398 u_long tcps_preddat; /* times hdr predict ok for data pkts */ 399 u_long tcps_pcbcachemiss; 400 u_long tcps_cachedrtt; /* times cached RTT in route updated */ 401 u_long tcps_cachedrttvar; /* times cached rttvar updated */ 402 u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 403 u_long tcps_usedrtt; /* times RTT initialized from route */ 404 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 405 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 406 u_long tcps_persistdrop; /* timeout in persist state */ 407 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 408 u_long tcps_mturesent; /* resends due to MTU discovery */ 409 u_long tcps_listendrop; /* listen queue overflows */ 410 u_long tcps_badrst; /* ignored RSTs in the window */ 411 412 u_long tcps_sc_added; /* entry added to syncache */ 413 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 414 u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 415 u_long tcps_sc_dropped; /* could not reply to packet */ 416 u_long tcps_sc_completed; /* successful extraction of entry */ 417 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 418 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 419 u_long tcps_sc_reset; /* RST removed entry from syncache */ 420 u_long tcps_sc_stale; /* timed out or listen socket gone */ 421 u_long tcps_sc_aborted; /* syncache entry aborted */ 422 u_long tcps_sc_badack; /* removed due to bad ACK */ 423 u_long tcps_sc_unreach; /* ICMP unreachable received */ 424 u_long tcps_sc_zonefail; /* zalloc() failed */ 425 u_long tcps_sc_sendcookie; /* SYN cookie sent */ 426 u_long tcps_sc_recvcookie; /* SYN cookie received */ 427 428 u_long tcps_hc_added; /* entry added to hostcache */ 429 u_long tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */ 430 431 /* SACK related stats */ 432 u_long tcps_sack_recovery_episode; /* SACK recovery episodes */ 433 u_long tcps_sack_rexmits; /* SACK rexmit segments */ 434 u_long tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 435 u_long tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 436 u_long tcps_sack_send_blocks; /* SACK blocks (options) sent */ 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 struct tcp_ident_mapping { 455 struct sockaddr_storage faddr, laddr; 456 uid_t euid, ruid; 457 }; 458 459 /* 460 * Names for TCP sysctl objects 461 */ 462 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 463 #define TCPCTL_MSSDFLT 3 /* MSS default */ 464 #define TCPCTL_STATS 4 /* statistics (read-only) */ 465 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 466 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 467 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 468 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 469 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 470 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 471 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 472 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 473 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 474 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 475 #define TCPCTL_DROP 15 /* drop tcp connection */ 476 #define TCPCTL_MAXID 16 477 478 #define TCPCTL_NAMES { \ 479 { 0, 0 }, \ 480 { "rfc1323", CTLTYPE_INT }, \ 481 { "mssdflt", CTLTYPE_INT }, \ 482 { "stats", CTLTYPE_STRUCT }, \ 483 { "rttdflt", CTLTYPE_INT }, \ 484 { "keepidle", CTLTYPE_INT }, \ 485 { "keepintvl", CTLTYPE_INT }, \ 486 { "sendspace", CTLTYPE_INT }, \ 487 { "recvspace", CTLTYPE_INT }, \ 488 { "keepinit", CTLTYPE_INT }, \ 489 { "pcblist", CTLTYPE_STRUCT }, \ 490 { "delacktime", CTLTYPE_INT }, \ 491 { "v6mssdflt", CTLTYPE_INT }, \ 492 { "maxid", CTLTYPE_INT }, \ 493 } 494 495 496 #ifdef _KERNEL 497 #ifdef SYSCTL_DECL 498 SYSCTL_DECL(_net_inet_tcp); 499 SYSCTL_DECL(_net_inet_tcp_sack); 500 #endif 501 502 extern struct inpcbhead tcb; /* head of queue of active tcpcb's */ 503 extern struct inpcbinfo tcbinfo; 504 extern struct tcpstat tcpstat; /* tcp statistics */ 505 extern int tcp_mssdflt; /* XXX */ 506 extern int tcp_minmss; 507 extern int tcp_minmssoverload; 508 extern int tcp_delack_enabled; 509 extern int tcp_do_newreno; 510 extern int path_mtu_discovery; 511 extern int ss_fltsz; 512 extern int ss_fltsz_local; 513 514 extern int tcp_do_sack; /* SACK enabled/disabled */ 515 516 struct tcpcb * 517 tcp_close(struct tcpcb *); 518 void tcp_twstart(struct tcpcb *); 519 int tcp_twrecycleable(struct tcptw *tw); 520 struct tcptw * 521 tcp_twclose(struct tcptw *_tw, int _reuse); 522 void tcp_ctlinput(int, struct sockaddr *, void *); 523 int tcp_ctloutput(struct socket *, struct sockopt *); 524 struct tcpcb * 525 tcp_drop(struct tcpcb *, int); 526 void tcp_drain(void); 527 void tcp_fasttimo(void); 528 void tcp_init(void); 529 void tcp_fini(void *); 530 void tcp_reass_init(void); 531 void tcp_input(struct mbuf *, int); 532 u_long tcp_maxmtu(struct in_conninfo *); 533 u_long tcp_maxmtu6(struct in_conninfo *); 534 void tcp_mss(struct tcpcb *, int); 535 int tcp_mssopt(struct in_conninfo *); 536 struct inpcb * 537 tcp_drop_syn_sent(struct inpcb *, int); 538 struct inpcb * 539 tcp_mtudisc(struct inpcb *, int); 540 struct tcpcb * 541 tcp_newtcpcb(struct inpcb *); 542 int tcp_output(struct tcpcb *); 543 struct inpcb * 544 tcp_quench(struct inpcb *, int); 545 void tcp_respond(struct tcpcb *, void *, 546 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 547 int tcp_twrespond(struct tcptw *, int); 548 void tcp_setpersist(struct tcpcb *); 549 #ifdef TCP_SIGNATURE 550 int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int); 551 #endif 552 void tcp_slowtimo(void); 553 struct tcptemp * 554 tcpip_maketemplate(struct inpcb *); 555 void tcpip_fillheaders(struct inpcb *, void *, void *); 556 struct tcpcb * 557 tcp_timers(struct tcpcb *, int); 558 void tcp_trace(int, int, struct tcpcb *, void *, struct tcphdr *, int); 559 void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); 560 void syncache_init(void); 561 void syncache_unreach(struct in_conninfo *, struct tcphdr *); 562 int syncache_expand(struct in_conninfo *, struct tcphdr *, 563 struct socket **, struct mbuf *); 564 int syncache_add(struct in_conninfo *, struct tcpopt *, 565 struct tcphdr *, struct socket **, struct mbuf *); 566 void syncache_chkrst(struct in_conninfo *, struct tcphdr *); 567 void syncache_badack(struct in_conninfo *); 568 /* 569 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 570 */ 571 void tcp_hc_init(void); 572 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 573 u_long tcp_hc_getmtu(struct in_conninfo *); 574 void tcp_hc_updatemtu(struct in_conninfo *, u_long); 575 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 576 577 extern struct pr_usrreqs tcp_usrreqs; 578 extern u_long tcp_sendspace; 579 extern u_long tcp_recvspace; 580 tcp_seq tcp_new_isn(struct tcpcb *); 581 582 int tcp_sack_option(struct tcpcb *,struct tcphdr *,u_char *,int); 583 void tcp_update_sack_list(struct tcpcb *tp); 584 void tcp_del_sackholes(struct tcpcb *, struct tcphdr *); 585 void tcp_clean_sackreport(struct tcpcb *tp); 586 void tcp_sack_adjust(struct tcpcb *tp); 587 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 588 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 589 void tcp_free_sackholes(struct tcpcb *tp); 590 int tcp_newreno(struct tcpcb *, struct tcphdr *); 591 u_long tcp_seq_subtract(u_long, u_long ); 592 #ifdef TCP_SACK_DEBUG 593 void tcp_print_holes(struct tcpcb *tp); 594 #endif /* TCP_SACK_DEBUG */ 595 596 #endif /* _KERNEL */ 597 598 #endif /* _NETINET_TCP_VAR_H_ */ 599