1 /* $OpenBSD: tcp_var.h,v 1.105 2014/01/23 23:51:29 henning Exp $ */ 2 /* $NetBSD: tcp_var.h,v 1.17 1996/02/13 23:44:24 christos Exp $ */ 3 4 /* 5 * Copyright (c) 1982, 1986, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)tcp_var.h 8.3 (Berkeley) 4/10/94 33 */ 34 35 #ifndef _NETINET_TCP_VAR_H_ 36 #define _NETINET_TCP_VAR_H_ 37 38 /* 39 * Kernel variables for tcp. 40 */ 41 42 struct sackblk { 43 tcp_seq start; /* start seq no. of sack block */ 44 tcp_seq end; /* end seq no. */ 45 }; 46 47 struct sackhole { 48 tcp_seq start; /* start seq no. of hole */ 49 tcp_seq end; /* end seq no. */ 50 int dups; /* number of dup(s)acks for this hole */ 51 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ 52 struct sackhole *next; /* next in list */ 53 }; 54 55 /* 56 * TCP sequence queue structures. 57 */ 58 TAILQ_HEAD(tcpqehead, tcpqent); 59 struct tcpqent { 60 TAILQ_ENTRY(tcpqent) tcpqe_q; 61 struct tcphdr *tcpqe_tcp; 62 struct mbuf *tcpqe_m; /* mbuf contains packet */ 63 }; 64 65 /* 66 * Tcp control block, one per tcp; fields: 67 */ 68 struct tcpcb { 69 struct tcpqehead t_segq; /* sequencing queue */ 70 struct timeout t_timer[TCPT_NTIMERS]; /* tcp timers */ 71 short t_state; /* state of this connection */ 72 short t_rxtshift; /* log(2) of rexmt exp. backoff */ 73 short t_rxtcur; /* current retransmit value */ 74 short t_dupacks; /* consecutive dup acks recd */ 75 u_short t_maxseg; /* maximum segment size */ 76 char t_force; /* 1 if forcing out a byte */ 77 u_int t_flags; 78 #define TF_ACKNOW 0x0001 /* ack peer immediately */ 79 #define TF_DELACK 0x0002 /* ack, but try to delay it */ 80 #define TF_NODELAY 0x0004 /* don't delay packets to coalesce */ 81 #define TF_NOOPT 0x0008 /* don't use tcp options */ 82 #define TF_SENTFIN 0x0010 /* have sent FIN */ 83 #define TF_REQ_SCALE 0x0020 /* have/will request window scaling */ 84 #define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */ 85 #define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */ 86 #define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */ 87 #define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */ 88 #define TF_SIGNATURE 0x0400 /* require TCP MD5 signature */ 89 #ifdef TCP_ECN 90 #define TF_ECN_PERMIT 0x00008000 /* other side said I could ECN */ 91 #define TF_RCVD_CE 0x00010000 /* send ECE in subsequent segs */ 92 #define TF_SEND_CWR 0x00020000 /* send CWR in next seg */ 93 #define TF_DISABLE_ECN 0x00040000 /* disable ECN for this connection */ 94 #endif 95 #define TF_LASTIDLE 0x00100000 /* no outstanding ACK on last send */ 96 #define TF_DEAD 0x00200000 /* dead and to-be-released */ 97 #define TF_PMTUD_PEND 0x00400000 /* Path MTU Discovery pending */ 98 #define TF_NEEDOUTPUT 0x00800000 /* call tcp_output after tcp_input */ 99 #define TF_BLOCKOUTPUT 0x01000000 /* avert tcp_output during tcp_input */ 100 #define TF_NOPUSH 0x02000000 /* don't push */ 101 102 struct mbuf *t_template; /* skeletal packet for transmit */ 103 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 104 struct timeout t_delack_to; /* delayed ACK callback */ 105 /* 106 * The following fields are used as in the protocol specification. 107 * See RFC793, Dec. 1981, page 21. 108 */ 109 /* send sequence variables */ 110 tcp_seq snd_una; /* send unacknowledged */ 111 tcp_seq snd_nxt; /* send next */ 112 tcp_seq snd_up; /* send urgent pointer */ 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 u_long snd_wnd; /* send window */ 117 #if 1 /*def TCP_SACK*/ 118 int sack_enable; /* enable SACK for this connection */ 119 int snd_numholes; /* number of holes seen by sender */ 120 struct sackhole *snd_holes; /* linked list of holes (sorted) */ 121 #if 1 /*defined(TCP_SACK) && defined(TCP_FACK)*/ 122 tcp_seq snd_fack; /* for FACK congestion control */ 123 u_long snd_awnd; /* snd_nxt - snd_fack + */ 124 /* retransmitted data */ 125 int retran_data; /* amount of outstanding retx. data */ 126 #endif /* TCP_FACK */ 127 #endif /* TCP_SACK */ 128 #if 1 /*defined(TCP_SACK) || defined(TCP_ECN)*/ 129 tcp_seq snd_last; /* for use in fast recovery */ 130 #endif 131 /* receive sequence variables */ 132 u_long rcv_wnd; /* receive window */ 133 tcp_seq rcv_nxt; /* receive next */ 134 tcp_seq rcv_up; /* receive urgent pointer */ 135 tcp_seq irs; /* initial receive sequence number */ 136 #if 1 /*def TCP_SACK*/ 137 tcp_seq rcv_lastsack; /* last seq number(+1) sack'd by rcv'r*/ 138 int rcv_numsacks; /* # distinct sack blks present */ 139 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 140 #endif 141 142 /* 143 * Additional variables for this implementation. 144 */ 145 /* receive variables */ 146 tcp_seq rcv_adv; /* advertised window */ 147 /* retransmit variables */ 148 tcp_seq snd_max; /* highest sequence number sent; 149 * used to recognize retransmits 150 */ 151 /* congestion control (for slow start, source quench, retransmit after loss) */ 152 u_long snd_cwnd; /* congestion-controlled window */ 153 u_long snd_ssthresh; /* snd_cwnd size threshold for 154 * for slow start exponential to 155 * linear switch 156 */ 157 158 /* auto-sizing variables */ 159 u_int rfbuf_cnt; /* recv buffer autoscaling byte count */ 160 u_int32_t rfbuf_ts; /* recv buffer autoscaling time stamp */ 161 162 u_short t_maxopd; /* mss plus options */ 163 u_short t_peermss; /* peer's maximum segment size */ 164 165 /* 166 * transmit timing stuff. See below for scale of srtt and rttvar. 167 * "Variance" is actually smoothed difference. 168 */ 169 uint32_t t_rcvtime; /* time last segment received */ 170 uint32_t t_rtttime; /* time we started measuring rtt */ 171 tcp_seq t_rtseq; /* sequence number being timed */ 172 short t_srtt; /* smoothed round-trip time */ 173 short t_rttvar; /* variance in round-trip time */ 174 u_short t_rttmin; /* minimum rtt allowed */ 175 u_long max_sndwnd; /* largest window peer has offered */ 176 177 /* out-of-band data */ 178 char t_oobflags; /* have some */ 179 char t_iobc; /* input character */ 180 #define TCPOOB_HAVEDATA 0x01 181 #define TCPOOB_HADDATA 0x02 182 short t_softerror; /* possible error not yet reported */ 183 184 /* RFC 1323 variables */ 185 u_char snd_scale; /* window scaling for send window */ 186 u_char rcv_scale; /* window scaling for recv window */ 187 u_char request_r_scale; /* pending window scaling */ 188 u_char requested_s_scale; 189 u_int32_t ts_recent; /* timestamp echo data */ 190 u_int32_t ts_modulate; /* modulation on timestamp */ 191 u_int32_t ts_recent_age; /* when last updated */ 192 tcp_seq last_ack_sent; 193 194 /* pointer for syn cache entries*/ 195 LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */ 196 197 /* Path-MTU Discovery Information */ 198 u_int t_pmtud_mss_acked; /* MSS acked, lower bound for MTU */ 199 u_int t_pmtud_mtu_sent; /* MTU used, upper bound for MTU */ 200 tcp_seq t_pmtud_th_seq; /* TCP SEQ from ICMP payload */ 201 u_int t_pmtud_nextmtu; /* Advertised Next-Hop MTU from ICMP */ 202 u_short t_pmtud_ip_len; /* IP length from ICMP payload */ 203 u_short t_pmtud_ip_hl; /* IP header length from ICMP payload */ 204 205 int pf; 206 207 struct timeout t_reap_to; /* delayed cleanup timeout */ 208 }; 209 210 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 211 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 212 213 #ifdef _KERNEL 214 extern int tcp_delack_ticks; 215 void tcp_delack(void *); 216 217 #define TCP_INIT_DELACK(tp) \ 218 timeout_set(&(tp)->t_delack_to, tcp_delack, tp) 219 220 #define TCP_RESTART_DELACK(tp) \ 221 timeout_add(&(tp)->t_delack_to, tcp_delack_ticks) 222 223 #define TCP_SET_DELACK(tp) \ 224 do { \ 225 if (((tp)->t_flags & TF_DELACK) == 0) { \ 226 (tp)->t_flags |= TF_DELACK; \ 227 TCP_RESTART_DELACK(tp); \ 228 } \ 229 } while (/* CONSTCOND */ 0) 230 231 #define TCP_CLEAR_DELACK(tp) \ 232 do { \ 233 if ((tp)->t_flags & TF_DELACK) { \ 234 (tp)->t_flags &= ~TF_DELACK; \ 235 timeout_del(&(tp)->t_delack_to); \ 236 } \ 237 } while (/* CONSTCOND */ 0) 238 239 /* 240 * Handy way of passing around TCP option info. 241 */ 242 struct tcp_opt_info { 243 int ts_present; 244 u_int32_t ts_val; 245 u_int32_t ts_ecr; 246 u_int16_t maxseg; 247 }; 248 249 /* 250 * Data for the TCP compressed state engine. 251 */ 252 union syn_cache_sa { 253 struct sockaddr sa; 254 struct sockaddr_in sin; 255 struct sockaddr_in6 sin6; 256 }; 257 258 struct syn_cache { 259 TAILQ_ENTRY(syn_cache) sc_bucketq; /* link on bucket list */ 260 struct timeout sc_timer; /* rexmt timer */ 261 union { /* cached route */ 262 struct route route4; 263 #ifdef INET6 264 struct route_in6 route6; 265 #endif 266 } sc_route_u; 267 #define sc_route4 sc_route_u.route4 268 #ifdef INET6 269 #define sc_route6 sc_route_u.route6 270 #endif 271 long sc_win; /* advertised window */ 272 int sc_bucketidx; /* our bucket index */ 273 u_int32_t sc_hash; 274 u_int32_t sc_timestamp; /* timestamp from SYN */ 275 u_int32_t sc_modulate; /* our timestamp modulator */ 276 #if 0 277 u_int32_t sc_timebase; /* our local timebase */ 278 #endif 279 union syn_cache_sa sc_src; 280 union syn_cache_sa sc_dst; 281 tcp_seq sc_irs; 282 tcp_seq sc_iss; 283 u_int sc_rtableid; 284 u_int sc_rxtcur; /* current rxt timeout */ 285 u_int sc_rxttot; /* total time spend on queues */ 286 u_short sc_rxtshift; /* for computing backoff */ 287 u_short sc_flags; 288 289 #define SCF_UNREACH 0x0001 /* we've had an unreach error */ 290 #define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */ 291 #define SCF_DEAD 0x0004 /* this entry to be released */ 292 #define SCF_SACK_PERMIT 0x0008 /* permit sack */ 293 #define SCF_ECN_PERMIT 0x0010 /* permit ecn */ 294 #define SCF_SIGNATURE 0x0020 /* enforce tcp signatures */ 295 296 struct mbuf *sc_ipopts; /* IP options */ 297 u_int16_t sc_peermaxseg; 298 u_int16_t sc_ourmaxseg; 299 u_int sc_request_r_scale : 4, 300 sc_requested_s_scale : 4; 301 302 struct tcpcb *sc_tp; /* tcb for listening socket */ 303 LIST_ENTRY(syn_cache) sc_tpq; /* list of entries by same tp */ 304 }; 305 306 struct syn_cache_head { 307 TAILQ_HEAD(, syn_cache) sch_bucket; /* bucket entries */ 308 u_short sch_length; /* # entries in bucket */ 309 }; 310 311 #endif /* _KERNEL */ 312 313 /* 314 * The smoothed round-trip time and estimated variance 315 * are stored as fixed point numbers scaled by the values below. 316 * For convenience, these scales are also used in smoothing the average 317 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 318 * With these scales, srtt has 5 bits to the right of the binary point, 319 * and thus an "ALPHA" of 0.875. rttvar has 4 bits to the right of the 320 * binary point, and is smoothed with an ALPHA of 0.75. 321 */ 322 #define TCP_RTT_SHIFT 3 /* shift for srtt; 5 bits frac. */ 323 #define TCP_RTTVAR_SHIFT 2 /* shift for rttvar; 4 bits */ 324 #define TCP_RTT_BASE_SHIFT 2 /* remaining 2 bit shift */ 325 #define TCP_RTT_MAX (1<<9) /* maximum rtt */ 326 327 /* 328 * The initial retransmission should happen at rtt + 4 * rttvar. 329 * Because of the way we do the smoothing, srtt and rttvar 330 * will each average +1/2 tick of bias. When we compute 331 * the retransmit timer, we want 1/2 tick of rounding and 332 * 1 extra tick because of +-1/2 tick uncertainty in the 333 * firing of the timer. The bias will give us exactly the 334 * 1.5 tick we need. But, because the bias is 335 * statistical, we have to test that we don't drop below 336 * the minimum feasible timer (which is 2 ticks). 337 * This macro assumes that the value of (1 << TCP_RTTVAR_SHIFT) 338 * is the same as the multiplier for rttvar. 339 */ 340 #define TCP_REXMTVAL(tp) \ 341 ((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> TCP_RTT_BASE_SHIFT) 342 343 /* 344 * TCP statistics. 345 * Many of these should be kept per connection, 346 * but that's inconvenient at the moment. 347 */ 348 struct tcpstat { 349 u_int32_t tcps_connattempt; /* connections initiated */ 350 u_int32_t tcps_accepts; /* connections accepted */ 351 u_int32_t tcps_connects; /* connections established */ 352 u_int32_t tcps_drops; /* connections dropped */ 353 u_int32_t tcps_conndrops; /* embryonic connections dropped */ 354 u_int32_t tcps_closed; /* conn. closed (includes drops) */ 355 u_int32_t tcps_segstimed; /* segs where we tried to get rtt */ 356 u_int32_t tcps_rttupdated; /* times we succeeded */ 357 u_int32_t tcps_delack; /* delayed acks sent */ 358 u_int32_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 359 u_int32_t tcps_rexmttimeo; /* retransmit timeouts */ 360 u_int32_t tcps_persisttimeo; /* persist timeouts */ 361 u_int32_t tcps_persistdrop; /* connections dropped in persist */ 362 u_int32_t tcps_keeptimeo; /* keepalive timeouts */ 363 u_int32_t tcps_keepprobe; /* keepalive probes sent */ 364 u_int32_t tcps_keepdrops; /* connections dropped in keepalive */ 365 366 u_int32_t tcps_sndtotal; /* total packets sent */ 367 u_int32_t tcps_sndpack; /* data packets sent */ 368 u_int64_t tcps_sndbyte; /* data bytes sent */ 369 u_int32_t tcps_sndrexmitpack; /* data packets retransmitted */ 370 u_int64_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 371 u_int64_t tcps_sndrexmitfast; /* Fast retransmits */ 372 u_int32_t tcps_sndacks; /* ack-only packets sent */ 373 u_int32_t tcps_sndprobe; /* window probes sent */ 374 u_int32_t tcps_sndurg; /* packets sent with URG only */ 375 u_int32_t tcps_sndwinup; /* window update-only packets sent */ 376 u_int32_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 377 378 u_int32_t tcps_rcvtotal; /* total packets received */ 379 u_int32_t tcps_rcvpack; /* packets received in sequence */ 380 u_int64_t tcps_rcvbyte; /* bytes received in sequence */ 381 u_int32_t tcps_rcvbadsum; /* packets received with ccksum errs */ 382 u_int32_t tcps_rcvbadoff; /* packets received with bad offset */ 383 u_int32_t tcps_rcvmemdrop; /* packets dropped for lack of memory */ 384 u_int32_t tcps_rcvnosec; /* packets dropped for lack of ipsec */ 385 u_int32_t tcps_rcvshort; /* packets received too short */ 386 u_int32_t tcps_rcvduppack; /* duplicate-only packets received */ 387 u_int64_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 388 u_int32_t tcps_rcvpartduppack; /* packets with some duplicate data */ 389 u_int64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 390 u_int32_t tcps_rcvoopack; /* out-of-order packets received */ 391 u_int64_t tcps_rcvoobyte; /* out-of-order bytes received */ 392 u_int32_t tcps_rcvpackafterwin; /* packets with data after window */ 393 u_int64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 394 u_int32_t tcps_rcvafterclose; /* packets rcvd after "close" */ 395 u_int32_t tcps_rcvwinprobe; /* rcvd window probe packets */ 396 u_int32_t tcps_rcvdupack; /* rcvd duplicate acks */ 397 u_int32_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 398 u_int32_t tcps_rcvacktooold; /* rcvd acks for old data */ 399 u_int32_t tcps_rcvackpack; /* rcvd ack packets */ 400 u_int64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 401 u_int32_t tcps_rcvwinupd; /* rcvd window update packets */ 402 u_int32_t tcps_pawsdrop; /* segments dropped due to PAWS */ 403 u_int32_t tcps_predack; /* times hdr predict ok for acks */ 404 u_int32_t tcps_preddat; /* times hdr predict ok for data pkts */ 405 406 u_int32_t tcps_pcbhashmiss; /* input packets missing pcb hash */ 407 u_int32_t tcps_noport; /* no socket on port */ 408 u_int32_t tcps_badsyn; /* SYN packet with src==dst rcv'ed */ 409 410 u_int32_t tcps_rcvbadsig; /* rcvd bad/missing TCP signatures */ 411 u_int64_t tcps_rcvgoodsig; /* rcvd good TCP signatures */ 412 u_int32_t tcps_inswcsum; /* input software-checksummed packets */ 413 u_int32_t tcps_outswcsum; /* output software-checksummed packets */ 414 415 /* ECN stats */ 416 u_int32_t tcps_ecn_accepts; /* ecn connections accepted */ 417 u_int32_t tcps_ecn_rcvece; /* # of rcvd ece */ 418 u_int32_t tcps_ecn_rcvcwr; /* # of rcvd cwr */ 419 u_int32_t tcps_ecn_rcvce; /* # of rcvd ce in ip header */ 420 u_int32_t tcps_ecn_sndect; /* # of cwr sent */ 421 u_int32_t tcps_ecn_sndece; /* # of ece sent */ 422 u_int32_t tcps_ecn_sndcwr; /* # of cwr sent */ 423 u_int32_t tcps_cwr_ecn; /* # of cwnd reduced by ecn */ 424 u_int32_t tcps_cwr_frecovery; /* # of cwnd reduced by fastrecovery */ 425 u_int32_t tcps_cwr_timeout; /* # of cwnd reduced by timeout */ 426 427 /* These statistics deal with the SYN cache. */ 428 u_int64_t tcps_sc_added; /* # of entries added */ 429 u_int64_t tcps_sc_completed; /* # of connections completed */ 430 u_int64_t tcps_sc_timed_out; /* # of entries timed out */ 431 u_int64_t tcps_sc_overflowed; /* # dropped due to overflow */ 432 u_int64_t tcps_sc_reset; /* # dropped due to RST */ 433 u_int64_t tcps_sc_unreach; /* # dropped due to ICMP unreach */ 434 u_int64_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */ 435 u_int64_t tcps_sc_aborted; /* # of entries aborted (no mem) */ 436 u_int64_t tcps_sc_dupesyn; /* # of duplicate SYNs received */ 437 u_int64_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */ 438 u_int64_t tcps_sc_collisions; /* # of hash collisions */ 439 u_int64_t tcps_sc_retransmitted;/* # of retransmissions */ 440 441 u_int64_t tcps_conndrained; /* # of connections drained */ 442 443 u_int64_t tcps_sack_recovery_episode; /* SACK recovery episodes */ 444 u_int64_t tcps_sack_rexmits; /* SACK rexmit segments */ 445 u_int64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 446 u_int64_t tcps_sack_rcv_opts; /* SACK options received */ 447 u_int64_t tcps_sack_snd_opts; /* SACK options sent */ 448 }; 449 450 /* 451 * Names for TCP sysctl objects. 452 */ 453 454 #define TCPCTL_RFC1323 1 /* enable/disable RFC1323 timestamps/scaling */ 455 #define TCPCTL_KEEPINITTIME 2 /* TCPT_KEEP value */ 456 #define TCPCTL_KEEPIDLE 3 /* allow tcp_keepidle to be changed */ 457 #define TCPCTL_KEEPINTVL 4 /* allow tcp_keepintvl to be changed */ 458 #define TCPCTL_SLOWHZ 5 /* return kernel idea of PR_SLOWHZ */ 459 #define TCPCTL_BADDYNAMIC 6 /* return bad dynamic port bitmap */ 460 #define TCPCTL_RECVSPACE 7 /* receive buffer space */ 461 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 462 #define TCPCTL_IDENT 9 /* get connection owner */ 463 #define TCPCTL_SACK 10 /* selective acknowledgement, rfc 2018 */ 464 #define TCPCTL_MSSDFLT 11 /* Default maximum segment size */ 465 #define TCPCTL_RSTPPSLIMIT 12 /* RST pps limit */ 466 #define TCPCTL_ACK_ON_PUSH 13 /* ACK immediately on PUSH */ 467 #define TCPCTL_ECN 14 /* RFC3168 ECN */ 468 #define TCPCTL_SYN_CACHE_LIMIT 15 /* max size of comp. state engine */ 469 #define TCPCTL_SYN_BUCKET_LIMIT 16 /* max size of hash bucket */ 470 #define TCPCTL_RFC3390 17 /* enable/disable RFC3390 increased cwnd */ 471 #define TCPCTL_REASS_LIMIT 18 /* max entries for tcp reass queues */ 472 #define TCPCTL_DROP 19 /* drop tcp connection */ 473 #define TCPCTL_SACKHOLE_LIMIT 20 /* max entries for tcp sack queues */ 474 #define TCPCTL_STATS 21 /* TCP statistics */ 475 #define TCPCTL_ALWAYS_KEEPALIVE 22 /* assume SO_KEEPALIVE is always set */ 476 #define TCPCTL_MAXID 23 477 478 #define TCPCTL_NAMES { \ 479 { 0, 0 }, \ 480 { "rfc1323", CTLTYPE_INT }, \ 481 { "keepinittime", CTLTYPE_INT }, \ 482 { "keepidle", CTLTYPE_INT }, \ 483 { "keepintvl", CTLTYPE_INT }, \ 484 { "slowhz", CTLTYPE_INT }, \ 485 { "baddynamic", CTLTYPE_STRUCT }, \ 486 { NULL, 0 }, \ 487 { NULL, 0 }, \ 488 { "ident", CTLTYPE_STRUCT }, \ 489 { "sack", CTLTYPE_INT }, \ 490 { "mssdflt", CTLTYPE_INT }, \ 491 { "rstppslimit", CTLTYPE_INT }, \ 492 { "ackonpush", CTLTYPE_INT }, \ 493 { "ecn", CTLTYPE_INT }, \ 494 { "syncachelimit", CTLTYPE_INT }, \ 495 { "synbucketlimit", CTLTYPE_INT }, \ 496 { "rfc3390", CTLTYPE_INT }, \ 497 { "reasslimit", CTLTYPE_INT }, \ 498 { "drop", CTLTYPE_STRUCT }, \ 499 { "sackholelimit", CTLTYPE_INT }, \ 500 { "stats", CTLTYPE_STRUCT }, \ 501 { "always_keepalive", CTLTYPE_INT } \ 502 } 503 504 #define TCPCTL_VARS { \ 505 NULL, \ 506 &tcp_do_rfc1323, \ 507 &tcptv_keep_init, \ 508 &tcp_keepidle, \ 509 &tcp_keepintvl, \ 510 NULL, \ 511 NULL, \ 512 NULL, \ 513 NULL, \ 514 NULL, \ 515 NULL, \ 516 &tcp_mssdflt, \ 517 &tcp_rst_ppslim, \ 518 &tcp_ack_on_push, \ 519 NULL, \ 520 &tcp_syn_cache_limit, \ 521 &tcp_syn_bucket_limit, \ 522 &tcp_do_rfc3390, \ 523 NULL, \ 524 NULL, \ 525 NULL, \ 526 NULL \ 527 } 528 529 struct tcp_ident_mapping { 530 struct sockaddr_storage faddr, laddr; 531 int euid, ruid; 532 u_int rdomain; 533 }; 534 535 #ifdef _KERNEL 536 extern struct inpcbtable tcbtable; /* head of queue of active tcpcb's */ 537 extern struct tcpstat tcpstat; /* tcp statistics */ 538 extern u_int32_t tcp_now; /* for RFC 1323 timestamps */ 539 extern int tcp_do_rfc1323; /* enabled/disabled? */ 540 extern int tcptv_keep_init; /* time to keep alive the initial SYN packet */ 541 extern int tcp_mssdflt; /* default maximum segment size */ 542 extern int tcp_rst_ppslim; /* maximum outgoing RST packet per second */ 543 extern int tcp_ack_on_push; /* ACK immediately on PUSH */ 544 #ifdef TCP_SACK 545 extern int tcp_do_sack; /* SACK enabled/disabled */ 546 extern struct pool sackhl_pool; 547 extern int tcp_sackhole_limit; /* max entries for tcp sack queues */ 548 #endif 549 extern int tcp_do_ecn; /* RFC3168 ECN enabled/disabled? */ 550 extern int tcp_do_rfc3390; /* RFC3390 Increasing TCP's Initial Window */ 551 552 extern struct pool tcpqe_pool; 553 extern int tcp_reass_limit; /* max entries for tcp reass queues */ 554 555 extern int tcp_syn_cache_limit; /* max entries for compressed state engine */ 556 extern int tcp_syn_bucket_limit;/* max entries per hash bucket */ 557 558 extern int tcp_syn_cache_size; 559 extern struct syn_cache_head tcp_syn_cache[]; 560 extern u_long syn_cache_count; 561 562 int tcp_attach(struct socket *); 563 void tcp_canceltimers(struct tcpcb *); 564 struct tcpcb * 565 tcp_close(struct tcpcb *); 566 void tcp_reaper(void *); 567 int tcp_freeq(struct tcpcb *); 568 #ifdef INET6 569 void tcp6_ctlinput(int, struct sockaddr *, u_int, void *); 570 #endif 571 void *tcp_ctlinput(int, struct sockaddr *, u_int, void *); 572 int tcp_ctloutput(int, struct socket *, int, int, struct mbuf **); 573 struct tcpcb * 574 tcp_disconnect(struct tcpcb *); 575 struct tcpcb * 576 tcp_drop(struct tcpcb *, int); 577 int tcp_dooptions(struct tcpcb *, u_char *, int, struct tcphdr *, 578 struct mbuf *, int, struct tcp_opt_info *, u_int); 579 void tcp_init(void); 580 #ifdef INET6 581 int tcp6_input(struct mbuf **, int *, int); 582 #endif 583 void tcp_input(struct mbuf *, ...); 584 int tcp_mss(struct tcpcb *, int); 585 void tcp_mss_update(struct tcpcb *); 586 u_int tcp_hdrsz(struct tcpcb *); 587 void tcp_mtudisc(struct inpcb *, int); 588 void tcp_mtudisc_increase(struct inpcb *, int); 589 #ifdef INET6 590 void tcp6_mtudisc(struct inpcb *, int); 591 void tcp6_mtudisc_callback(struct sockaddr_in6 *, u_int); 592 #endif 593 struct tcpcb * 594 tcp_newtcpcb(struct inpcb *); 595 void tcp_notify(struct inpcb *, int); 596 int tcp_output(struct tcpcb *); 597 void tcp_pulloutofband(struct socket *, u_int, struct mbuf *, int); 598 int tcp_reass(struct tcpcb *, struct tcphdr *, struct mbuf *, int *); 599 void tcp_rscale(struct tcpcb *, u_long); 600 void tcp_respond(struct tcpcb *, caddr_t, struct tcphdr *, tcp_seq, 601 tcp_seq, int, u_int); 602 void tcp_setpersist(struct tcpcb *); 603 void tcp_update_sndspace(struct tcpcb *); 604 void tcp_update_rcvspace(struct tcpcb *); 605 void tcp_slowtimo(void); 606 struct mbuf * 607 tcp_template(struct tcpcb *); 608 void tcp_trace(short, short, struct tcpcb *, caddr_t, int, int); 609 struct tcpcb * 610 tcp_usrclosed(struct tcpcb *); 611 int tcp_sysctl(int *, u_int, void *, size_t *, void *, size_t); 612 int tcp_usrreq(struct socket *, 613 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *); 614 void tcp_xmit_timer(struct tcpcb *, int); 615 void tcpdropoldhalfopen(struct tcpcb *, u_int16_t); 616 #ifdef TCP_SACK 617 void tcp_sack_option(struct tcpcb *,struct tcphdr *,u_char *,int); 618 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq, tcp_seq); 619 void tcp_del_sackholes(struct tcpcb *, struct tcphdr *); 620 void tcp_clean_sackreport(struct tcpcb *tp); 621 void tcp_sack_adjust(struct tcpcb *tp); 622 struct sackhole * 623 tcp_sack_output(struct tcpcb *tp); 624 int tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 625 #ifdef DEBUG 626 void tcp_print_holes(struct tcpcb *tp); 627 #endif 628 #endif /* TCP_SACK */ 629 #if defined(TCP_SACK) 630 int tcp_newreno(struct tcpcb *, struct tcphdr *); 631 u_long tcp_seq_subtract(u_long, u_long ); 632 #endif /* TCP_SACK */ 633 #ifdef TCP_SIGNATURE 634 int tcp_signature_apply(caddr_t, caddr_t, unsigned int); 635 int tcp_signature(struct tdb *, int, struct mbuf *, struct tcphdr *, 636 int, int, char *); 637 #endif /* TCP_SIGNATURE */ 638 void tcp_set_iss_tsm(struct tcpcb *); 639 640 int syn_cache_add(struct sockaddr *, struct sockaddr *, 641 struct tcphdr *, unsigned int, struct socket *, 642 struct mbuf *, u_char *, int, struct tcp_opt_info *, tcp_seq *); 643 void syn_cache_unreach(struct sockaddr *, struct sockaddr *, 644 struct tcphdr *, u_int); 645 struct socket *syn_cache_get(struct sockaddr *, struct sockaddr *, 646 struct tcphdr *, unsigned int, unsigned int, 647 struct socket *so, struct mbuf *); 648 void syn_cache_init(void); 649 void syn_cache_insert(struct syn_cache *, struct tcpcb *); 650 struct syn_cache *syn_cache_lookup(struct sockaddr *, struct sockaddr *, 651 struct syn_cache_head **, u_int); 652 void syn_cache_reset(struct sockaddr *, struct sockaddr *, 653 struct tcphdr *, u_int); 654 int syn_cache_respond(struct syn_cache *, struct mbuf *); 655 void syn_cache_timer(void *); 656 void syn_cache_cleanup(struct tcpcb *); 657 void syn_cache_reaper(void *); 658 659 #endif /* _KERNEL */ 660 #endif /* _NETINET_TCP_VAR_H_ */ 661