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 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */ 64 }; 65 66 struct sackhint { 67 struct sackhole *nexthole; 68 int sack_bytes_rexmit; 69 }; 70 71 struct tcptemp { 72 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 73 struct tcphdr tt_t; 74 }; 75 76 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 77 78 /* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */ 79 #ifdef INET6 80 #define ND6_HINT(tp) \ 81 do { \ 82 if ((tp) && (tp)->t_inpcb && \ 83 ((tp)->t_inpcb->inp_vflag & INP_IPV6) != 0) \ 84 nd6_nud_hint(NULL, NULL, 0); \ 85 } while (0) 86 #else 87 #define ND6_HINT(tp) 88 #endif 89 90 /* 91 * Tcp control block, one per tcp; fields: 92 * Organized for 16 byte cacheline efficiency. 93 */ 94 struct tcpcb { 95 struct tsegqe_head t_segq; /* segment reassembly queue */ 96 int t_segqlen; /* segment reassembly queue length */ 97 int t_dupacks; /* consecutive dup acks recd */ 98 99 struct tcp_timer *t_timers; /* All the TCP timers in one struct */ 100 101 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 102 int t_state; /* state of this connection */ 103 u_int t_flags; 104 #define TF_ACKNOW 0x000001 /* ack peer immediately */ 105 #define TF_DELACK 0x000002 /* ack, but try to delay it */ 106 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 107 #define TF_NOOPT 0x000008 /* don't use tcp options */ 108 #define TF_SENTFIN 0x000010 /* have sent FIN */ 109 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 110 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 111 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 112 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 113 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 114 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 115 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 116 #define TF_NOPUSH 0x001000 /* don't push */ 117 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 118 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 119 #define TF_LASTIDLE 0x040000 /* connection was previously idle */ 120 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 121 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 122 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 123 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 124 #define TF_FORCEDATA 0x800000 /* force out a byte */ 125 #define TF_TSO 0x1000000 /* TSO enabled on this connection */ 126 #define TF_TOE 0x2000000 /* this connection is offloaded */ 127 #define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */ 128 #define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */ 129 #define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */ 130 131 tcp_seq snd_una; /* send unacknowledged */ 132 tcp_seq snd_max; /* highest sequence number sent; 133 * used to recognize retransmits 134 */ 135 tcp_seq snd_nxt; /* send next */ 136 tcp_seq snd_up; /* send urgent pointer */ 137 138 tcp_seq snd_wl1; /* window update seg seq number */ 139 tcp_seq snd_wl2; /* window update seg ack number */ 140 tcp_seq iss; /* initial send sequence number */ 141 tcp_seq irs; /* initial receive sequence number */ 142 143 tcp_seq rcv_nxt; /* receive next */ 144 tcp_seq rcv_adv; /* advertised window */ 145 u_long rcv_wnd; /* receive window */ 146 tcp_seq rcv_up; /* receive urgent pointer */ 147 148 u_long snd_wnd; /* send window */ 149 u_long snd_cwnd; /* congestion-controlled window */ 150 u_long snd_bwnd; /* bandwidth-controlled window */ 151 u_long snd_ssthresh; /* snd_cwnd size threshold for 152 * for slow start exponential to 153 * linear switch 154 */ 155 u_long snd_bandwidth; /* calculated bandwidth or 0 */ 156 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 157 158 u_int t_maxopd; /* mss plus options */ 159 160 u_long t_rcvtime; /* inactivity time */ 161 u_long t_starttime; /* time connection was established */ 162 int t_rtttime; /* round trip time */ 163 tcp_seq t_rtseq; /* sequence number being timed */ 164 165 int t_bw_rtttime; /* used for bandwidth calculation */ 166 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ 167 168 int t_rxtcur; /* current retransmit value (ticks) */ 169 u_int t_maxseg; /* maximum segment size */ 170 int t_srtt; /* smoothed round-trip time */ 171 int t_rttvar; /* variance in round-trip time */ 172 173 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 174 u_int t_rttmin; /* minimum rtt allowed */ 175 u_int t_rttbest; /* best rtt we've seen */ 176 u_long t_rttupdated; /* number of times rtt sampled */ 177 u_long max_sndwnd; /* largest window peer has offered */ 178 179 int t_softerror; /* possible error not yet reported */ 180 /* out-of-band data */ 181 char t_oobflags; /* have some */ 182 char t_iobc; /* input character */ 183 #define TCPOOB_HAVEDATA 0x01 184 #define TCPOOB_HADDATA 0x02 185 /* RFC 1323 variables */ 186 u_char snd_scale; /* window scaling for send window */ 187 u_char rcv_scale; /* window scaling for recv window */ 188 u_char request_r_scale; /* pending window scaling */ 189 u_int32_t ts_recent; /* timestamp echo data */ 190 u_long ts_recent_age; /* when last updated */ 191 u_int32_t ts_offset; /* our timestamp offset */ 192 193 tcp_seq last_ack_sent; 194 /* experimental */ 195 u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 196 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 197 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 198 u_long t_badrxtwin; /* window for retransmit recovery */ 199 u_char snd_limited; /* segments limited transmitted */ 200 /* SACK related state */ 201 int snd_numholes; /* number of holes seen by sender */ 202 TAILQ_HEAD(sackhole_head, sackhole) snd_holes; 203 /* SACK scoreboard (sorted) */ 204 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ 205 int rcv_numsacks; /* # distinct sack blks present */ 206 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 207 tcp_seq sack_newdata; /* New data xmitted in this recovery 208 episode starts at this seq number */ 209 struct sackhint sackhint; /* SACK scoreboard hint */ 210 int t_rttlow; /* smallest observerved RTT */ 211 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ 212 int rfbuf_cnt; /* recv buffer autoscaling byte count */ 213 void *t_pspare[3]; /* toe usrreqs / toepcb * / congestion algo / vimage / 1 general use */ 214 struct toe_usrreqs *t_tu; /* offload operations vector */ 215 void *t_toe; /* TOE pcb pointer */ 216 }; 217 218 #define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY) 219 #define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY 220 #define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY 221 222 #ifdef TCP_SIGNATURE 223 /* 224 * Defines which are needed by the xform_tcp module and tcp_[in|out]put 225 * for SADB verification and lookup. 226 */ 227 #define TCP_SIGLEN 16 /* length of computed digest in bytes */ 228 #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */ 229 #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */ 230 /* 231 * Only a single SA per host may be specified at this time. An SPI is 232 * needed in order for the KEY_ALLOCSA() lookup to work. 233 */ 234 #define TCP_SIG_SPI 0x1000 235 #endif /* TCP_SIGNATURE */ 236 237 /* 238 * Structure to hold TCP options that are only used during segment 239 * processing (in tcp_input), but not held in the tcpcb. 240 * It's basically used to reduce the number of parameters 241 * to tcp_dooptions and tcp_addoptions. 242 * The binary order of the to_flags is relevant for packing of the 243 * options in tcp_addoptions. 244 */ 245 struct tcpopt { 246 u_long to_flags; /* which options are present */ 247 #define TOF_MSS 0x0001 /* maximum segment size */ 248 #define TOF_SCALE 0x0002 /* window scaling */ 249 #define TOF_SACKPERM 0x0004 /* SACK permitted */ 250 #define TOF_TS 0x0010 /* timestamp */ 251 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ 252 #define TOF_SACK 0x0080 /* Peer sent SACK option */ 253 #define TOF_MAXOPT 0x0100 254 u_int32_t to_tsval; /* new timestamp */ 255 u_int32_t to_tsecr; /* reflected timestamp */ 256 u_int16_t to_mss; /* maximum segment size */ 257 u_int8_t to_wscale; /* window scaling */ 258 u_int8_t to_nsacks; /* number of SACK blocks */ 259 u_char *to_sacks; /* pointer to the first SACK blocks */ 260 u_char *to_signature; /* pointer to the TCP-MD5 signature */ 261 }; 262 263 /* 264 * Flags for tcp_dooptions. 265 */ 266 #define TO_SYN 0x01 /* parse SYN-only options */ 267 268 struct hc_metrics_lite { /* must stay in sync with hc_metrics */ 269 u_long rmx_mtu; /* MTU for this path */ 270 u_long rmx_ssthresh; /* outbound gateway buffer limit */ 271 u_long rmx_rtt; /* estimated round trip time */ 272 u_long rmx_rttvar; /* estimated rtt variance */ 273 u_long rmx_bandwidth; /* estimated bandwidth */ 274 u_long rmx_cwnd; /* congestion window */ 275 u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 276 u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 277 }; 278 279 #ifndef _NETINET_IN_PCB_H_ 280 struct in_conninfo; 281 #endif /* _NETINET_IN_PCB_H_ */ 282 283 struct tcptw { 284 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 285 tcp_seq snd_nxt; 286 tcp_seq rcv_nxt; 287 tcp_seq iss; 288 tcp_seq irs; 289 u_short last_win; /* cached window value */ 290 u_short tw_so_options; /* copy of so_options */ 291 struct ucred *tw_cred; /* user credentials */ 292 u_long t_recent; 293 u_int32_t ts_offset; /* our timestamp offset */ 294 u_long t_starttime; 295 int tw_time; 296 TAILQ_ENTRY(tcptw) tw_2msl; 297 }; 298 299 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 300 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 301 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 302 303 /* 304 * The smoothed round-trip time and estimated variance 305 * are stored as fixed point numbers scaled by the values below. 306 * For convenience, these scales are also used in smoothing the average 307 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 308 * With these scales, srtt has 3 bits to the right of the binary point, 309 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 310 * binary point, and is smoothed with an ALPHA of 0.75. 311 */ 312 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 313 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 314 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 315 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 316 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 317 318 /* 319 * The initial retransmission should happen at rtt + 4 * rttvar. 320 * Because of the way we do the smoothing, srtt and rttvar 321 * will each average +1/2 tick of bias. When we compute 322 * the retransmit timer, we want 1/2 tick of rounding and 323 * 1 extra tick because of +-1/2 tick uncertainty in the 324 * firing of the timer. The bias will give us exactly the 325 * 1.5 tick we need. But, because the bias is 326 * statistical, we have to test that we don't drop below 327 * the minimum feasible timer (which is 2 ticks). 328 * This version of the macro adapted from a paper by Lawrence 329 * Brakmo and Larry Peterson which outlines a problem caused 330 * by insufficient precision in the original implementation, 331 * which results in inappropriately large RTO values for very 332 * fast networks. 333 */ 334 #define TCP_REXMTVAL(tp) \ 335 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 336 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 337 338 /* 339 * TCP statistics. 340 * Many of these should be kept per connection, 341 * but that's inconvenient at the moment. 342 */ 343 struct tcpstat { 344 u_long tcps_connattempt; /* connections initiated */ 345 u_long tcps_accepts; /* connections accepted */ 346 u_long tcps_connects; /* connections established */ 347 u_long tcps_drops; /* connections dropped */ 348 u_long tcps_conndrops; /* embryonic connections dropped */ 349 u_long tcps_minmssdrops; /* average minmss too low drops */ 350 u_long tcps_closed; /* conn. closed (includes drops) */ 351 u_long tcps_segstimed; /* segs where we tried to get rtt */ 352 u_long tcps_rttupdated; /* times we succeeded */ 353 u_long tcps_delack; /* delayed acks sent */ 354 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 355 u_long tcps_rexmttimeo; /* retransmit timeouts */ 356 u_long tcps_persisttimeo; /* persist timeouts */ 357 u_long tcps_keeptimeo; /* keepalive timeouts */ 358 u_long tcps_keepprobe; /* keepalive probes sent */ 359 u_long tcps_keepdrops; /* connections dropped in keepalive */ 360 361 u_long tcps_sndtotal; /* total packets sent */ 362 u_long tcps_sndpack; /* data packets sent */ 363 u_long tcps_sndbyte; /* data bytes sent */ 364 u_long tcps_sndrexmitpack; /* data packets retransmitted */ 365 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 366 u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 367 u_long tcps_sndacks; /* ack-only packets sent */ 368 u_long tcps_sndprobe; /* window probes sent */ 369 u_long tcps_sndurg; /* packets sent with URG only */ 370 u_long tcps_sndwinup; /* window update-only packets sent */ 371 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 372 373 u_long tcps_rcvtotal; /* total packets received */ 374 u_long tcps_rcvpack; /* packets received in sequence */ 375 u_long tcps_rcvbyte; /* bytes received in sequence */ 376 u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 377 u_long tcps_rcvbadoff; /* packets received with bad offset */ 378 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 379 u_long tcps_rcvshort; /* packets received too short */ 380 u_long tcps_rcvduppack; /* duplicate-only packets received */ 381 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 382 u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 383 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 384 u_long tcps_rcvoopack; /* out-of-order packets received */ 385 u_long tcps_rcvoobyte; /* out-of-order bytes received */ 386 u_long tcps_rcvpackafterwin; /* packets with data after window */ 387 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 388 u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 389 u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 390 u_long tcps_rcvdupack; /* rcvd duplicate acks */ 391 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 392 u_long tcps_rcvackpack; /* rcvd ack packets */ 393 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 394 u_long tcps_rcvwinupd; /* rcvd window update packets */ 395 u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 396 u_long tcps_predack; /* times hdr predict ok for acks */ 397 u_long tcps_preddat; /* times hdr predict ok for data pkts */ 398 u_long tcps_pcbcachemiss; 399 u_long tcps_cachedrtt; /* times cached RTT in route updated */ 400 u_long tcps_cachedrttvar; /* times cached rttvar updated */ 401 u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 402 u_long tcps_usedrtt; /* times RTT initialized from route */ 403 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 404 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 405 u_long tcps_persistdrop; /* timeout in persist state */ 406 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 407 u_long tcps_mturesent; /* resends due to MTU discovery */ 408 u_long tcps_listendrop; /* listen queue overflows */ 409 u_long tcps_badrst; /* ignored RSTs in the window */ 410 411 u_long tcps_sc_added; /* entry added to syncache */ 412 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 413 u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 414 u_long tcps_sc_dropped; /* could not reply to packet */ 415 u_long tcps_sc_completed; /* successful extraction of entry */ 416 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 417 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 418 u_long tcps_sc_reset; /* RST removed entry from syncache */ 419 u_long tcps_sc_stale; /* timed out or listen socket gone */ 420 u_long tcps_sc_aborted; /* syncache entry aborted */ 421 u_long tcps_sc_badack; /* removed due to bad ACK */ 422 u_long tcps_sc_unreach; /* ICMP unreachable received */ 423 u_long tcps_sc_zonefail; /* zalloc() failed */ 424 u_long tcps_sc_sendcookie; /* SYN cookie sent */ 425 u_long tcps_sc_recvcookie; /* SYN cookie received */ 426 427 u_long tcps_hc_added; /* entry added to hostcache */ 428 u_long tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */ 429 430 u_long tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ 431 432 /* SACK related stats */ 433 u_long tcps_sack_recovery_episode; /* SACK recovery episodes */ 434 u_long tcps_sack_rexmits; /* SACK rexmit segments */ 435 u_long tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 436 u_long tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 437 u_long tcps_sack_send_blocks; /* SACK blocks (options) sent */ 438 u_long tcps_sack_sboverflow; /* times scoreboard overflowed */ 439 440 /* ECN related stats */ 441 u_long tcps_ecn_ce; /* ECN Congestion Experienced */ 442 u_long tcps_ecn_ect0; /* ECN Capable Transport */ 443 u_long tcps_ecn_ect1; /* ECN Capable Transport */ 444 u_long tcps_ecn_shs; /* ECN successful handshakes */ 445 u_long tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */ 446 }; 447 448 /* 449 * TCB structure exported to user-land via sysctl(3). 450 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 451 * included. Not all of our clients do. 452 */ 453 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 454 struct xtcpcb { 455 size_t xt_len; 456 struct inpcb xt_inp; 457 struct tcpcb xt_tp; 458 struct xsocket xt_socket; 459 u_quad_t xt_alignment_hack; 460 }; 461 #endif 462 463 /* 464 * Names for TCP sysctl objects 465 */ 466 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 467 #define TCPCTL_MSSDFLT 3 /* MSS default */ 468 #define TCPCTL_STATS 4 /* statistics (read-only) */ 469 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 470 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 471 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 472 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 473 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 474 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 475 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 476 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 477 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 478 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 479 #define TCPCTL_DROP 15 /* drop tcp connection */ 480 #define TCPCTL_MAXID 16 481 #define TCPCTL_FINWAIT2_TIMEOUT 17 482 483 #define TCPCTL_NAMES { \ 484 { 0, 0 }, \ 485 { "rfc1323", CTLTYPE_INT }, \ 486 { "mssdflt", CTLTYPE_INT }, \ 487 { "stats", CTLTYPE_STRUCT }, \ 488 { "rttdflt", CTLTYPE_INT }, \ 489 { "keepidle", CTLTYPE_INT }, \ 490 { "keepintvl", CTLTYPE_INT }, \ 491 { "sendspace", CTLTYPE_INT }, \ 492 { "recvspace", CTLTYPE_INT }, \ 493 { "keepinit", CTLTYPE_INT }, \ 494 { "pcblist", CTLTYPE_STRUCT }, \ 495 { "delacktime", CTLTYPE_INT }, \ 496 { "v6mssdflt", CTLTYPE_INT }, \ 497 { "maxid", CTLTYPE_INT }, \ 498 } 499 500 501 #ifdef _KERNEL 502 #ifdef SYSCTL_DECL 503 SYSCTL_DECL(_net_inet_tcp); 504 SYSCTL_DECL(_net_inet_tcp_sack); 505 MALLOC_DECLARE(M_TCPLOG); 506 #endif 507 508 extern struct inpcbhead tcb; /* head of queue of active tcpcb's */ 509 extern struct inpcbinfo tcbinfo; 510 extern struct tcpstat tcpstat; /* tcp statistics */ 511 extern int tcp_log_in_vain; 512 extern int tcp_mssdflt; /* XXX */ 513 extern int tcp_minmss; 514 extern int tcp_delack_enabled; 515 extern int tcp_do_newreno; 516 extern int path_mtu_discovery; 517 extern int ss_fltsz; 518 extern int ss_fltsz_local; 519 520 extern int tcp_do_sack; /* SACK enabled/disabled */ 521 extern int tcp_sc_rst_sock_fail; /* RST on sock alloc failure */ 522 extern int tcp_do_ecn; /* TCP ECN enabled/disabled */ 523 extern int tcp_ecn_maxretries; 524 525 int tcp_addoptions(struct tcpopt *, u_char *); 526 struct tcpcb * 527 tcp_close(struct tcpcb *); 528 void tcp_discardcb(struct tcpcb *); 529 void tcp_twstart(struct tcpcb *); 530 #if 0 531 int tcp_twrecycleable(struct tcptw *tw); 532 #endif 533 void tcp_twclose(struct tcptw *_tw, int _reuse); 534 void tcp_ctlinput(int, struct sockaddr *, void *); 535 int tcp_ctloutput(struct socket *, struct sockopt *); 536 struct tcpcb * 537 tcp_drop(struct tcpcb *, int); 538 void tcp_drain(void); 539 void tcp_fasttimo(void); 540 void tcp_init(void); 541 void tcp_fini(void *); 542 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *, 543 const void *); 544 int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *); 545 void tcp_reass_init(void); 546 void tcp_input(struct mbuf *, int); 547 u_long tcp_maxmtu(struct in_conninfo *, int *); 548 u_long tcp_maxmtu6(struct in_conninfo *, int *); 549 void tcp_mss_update(struct tcpcb *, int, struct hc_metrics_lite *); 550 void tcp_mss(struct tcpcb *, int); 551 int tcp_mssopt(struct in_conninfo *); 552 struct inpcb * 553 tcp_drop_syn_sent(struct inpcb *, int); 554 struct inpcb * 555 tcp_mtudisc(struct inpcb *, int); 556 struct tcpcb * 557 tcp_newtcpcb(struct inpcb *); 558 int tcp_output(struct tcpcb *); 559 void tcp_respond(struct tcpcb *, void *, 560 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 561 void tcp_tw_init(void); 562 void tcp_tw_zone_change(void); 563 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *, 564 struct mbuf *, int); 565 int tcp_twrespond(struct tcptw *, int); 566 void tcp_setpersist(struct tcpcb *); 567 #ifdef TCP_SIGNATURE 568 int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int); 569 #endif 570 void tcp_slowtimo(void); 571 struct tcptemp * 572 tcpip_maketemplate(struct inpcb *); 573 void tcpip_fillheaders(struct inpcb *, void *, void *); 574 void tcp_timer_activate(struct tcpcb *, int, u_int); 575 int tcp_timer_active(struct tcpcb *, int); 576 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); 577 void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); 578 /* 579 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 580 */ 581 void tcp_hc_init(void); 582 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 583 u_long tcp_hc_getmtu(struct in_conninfo *); 584 void tcp_hc_updatemtu(struct in_conninfo *, u_long); 585 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 586 587 extern struct pr_usrreqs tcp_usrreqs; 588 extern u_long tcp_sendspace; 589 extern u_long tcp_recvspace; 590 tcp_seq tcp_new_isn(struct tcpcb *); 591 592 void tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq); 593 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); 594 void tcp_clean_sackreport(struct tcpcb *tp); 595 void tcp_sack_adjust(struct tcpcb *tp); 596 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 597 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 598 void tcp_free_sackholes(struct tcpcb *tp); 599 int tcp_newreno(struct tcpcb *, struct tcphdr *); 600 u_long tcp_seq_subtract(u_long, u_long ); 601 602 #endif /* _KERNEL */ 603 604 #endif /* _NETINET_TCP_VAR_H_ */ 605