1 /* $OpenBSD: tcp_var.h,v 1.90 2008/11/08 12:54:58 dlg 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 99 struct mbuf *t_template; /* skeletal packet for transmit */ 100 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 101 struct timeout t_delack_to; /* delayed ACK callback */ 102 /* 103 * The following fields are used as in the protocol specification. 104 * See RFC793, Dec. 1981, page 21. 105 */ 106 /* send sequence variables */ 107 tcp_seq snd_una; /* send unacknowledged */ 108 tcp_seq snd_nxt; /* send next */ 109 tcp_seq snd_up; /* send urgent pointer */ 110 tcp_seq snd_wl1; /* window update seg seq number */ 111 tcp_seq snd_wl2; /* window update seg ack number */ 112 tcp_seq iss; /* initial send sequence number */ 113 u_long snd_wnd; /* send window */ 114 #if 1 /*def TCP_SACK*/ 115 int sack_enable; /* enable SACK for this connection */ 116 int snd_numholes; /* number of holes seen by sender */ 117 struct sackhole *snd_holes; /* linked list of holes (sorted) */ 118 #if 1 /*defined(TCP_SACK) && defined(TCP_FACK)*/ 119 tcp_seq snd_fack; /* for FACK congestion control */ 120 u_long snd_awnd; /* snd_nxt - snd_fack + */ 121 /* retransmitted data */ 122 int retran_data; /* amount of outstanding retx. data */ 123 #endif /* TCP_FACK */ 124 #endif /* TCP_SACK */ 125 #if 1 /*defined(TCP_SACK) || defined(TCP_ECN)*/ 126 tcp_seq snd_last; /* for use in fast recovery */ 127 #endif 128 /* receive sequence variables */ 129 u_long rcv_wnd; /* receive window */ 130 tcp_seq rcv_nxt; /* receive next */ 131 tcp_seq rcv_up; /* receive urgent pointer */ 132 tcp_seq irs; /* initial receive sequence number */ 133 #if 1 /*def TCP_SACK*/ 134 tcp_seq rcv_lastsack; /* last seq number(+1) sack'd by rcv'r*/ 135 int rcv_numsacks; /* # distinct sack blks present */ 136 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 137 #endif 138 139 /* 140 * Additional variables for this implementation. 141 */ 142 /* receive variables */ 143 tcp_seq rcv_adv; /* advertised window */ 144 /* retransmit variables */ 145 tcp_seq snd_max; /* highest sequence number sent; 146 * used to recognize retransmits 147 */ 148 /* congestion control (for slow start, source quench, retransmit after loss) */ 149 u_long snd_cwnd; /* congestion-controlled window */ 150 u_long snd_ssthresh; /* snd_cwnd size threshold for 151 * for slow start exponential to 152 * linear switch 153 */ 154 u_short t_maxopd; /* mss plus options */ 155 u_short t_peermss; /* peer's maximum segment size */ 156 157 /* 158 * transmit timing stuff. See below for scale of srtt and rttvar. 159 * "Variance" is actually smoothed difference. 160 */ 161 uint32_t t_rcvtime; /* time last segment received */ 162 uint32_t t_rtttime; /* time we started measuring rtt */ 163 tcp_seq t_rtseq; /* sequence number being timed */ 164 short t_srtt; /* smoothed round-trip time */ 165 short t_rttvar; /* variance in round-trip time */ 166 u_short t_rttmin; /* minimum rtt allowed */ 167 u_long max_sndwnd; /* largest window peer has offered */ 168 169 /* out-of-band data */ 170 char t_oobflags; /* have some */ 171 char t_iobc; /* input character */ 172 #define TCPOOB_HAVEDATA 0x01 173 #define TCPOOB_HADDATA 0x02 174 short t_softerror; /* possible error not yet reported */ 175 176 /* RFC 1323 variables */ 177 u_char snd_scale; /* window scaling for send window */ 178 u_char rcv_scale; /* window scaling for recv window */ 179 u_char request_r_scale; /* pending window scaling */ 180 u_char requested_s_scale; 181 u_int32_t ts_recent; /* timestamp echo data */ 182 u_int32_t ts_modulate; /* modulation on timestamp */ 183 u_int32_t ts_recent_age; /* when last updated */ 184 tcp_seq last_ack_sent; 185 186 /* pointer for syn cache entries*/ 187 LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */ 188 189 /* Path-MTU Discovery Information */ 190 u_int t_pmtud_mss_acked; /* MSS acked, lower bound for MTU */ 191 u_int t_pmtud_mtu_sent; /* MTU used, upper bound for MTU */ 192 tcp_seq t_pmtud_th_seq; /* TCP SEQ from ICMP payload */ 193 u_int t_pmtud_nextmtu; /* Advertised Next-Hop MTU from ICMP */ 194 u_short t_pmtud_ip_len; /* IP length from ICMP payload */ 195 u_short t_pmtud_ip_hl; /* IP header length from ICMP payload */ 196 197 int pf; 198 199 struct timeout t_reap_to; /* delayed cleanup timeout */ 200 }; 201 202 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 203 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 204 205 #ifdef _KERNEL 206 extern int tcp_delack_ticks; 207 void tcp_delack(void *); 208 209 #define TCP_INIT_DELACK(tp) \ 210 timeout_set(&(tp)->t_delack_to, tcp_delack, tp) 211 212 #define TCP_RESTART_DELACK(tp) \ 213 timeout_add(&(tp)->t_delack_to, tcp_delack_ticks) 214 215 #define TCP_SET_DELACK(tp) \ 216 do { \ 217 if (((tp)->t_flags & TF_DELACK) == 0) { \ 218 (tp)->t_flags |= TF_DELACK; \ 219 TCP_RESTART_DELACK(tp); \ 220 } \ 221 } while (/* CONSTCOND */ 0) 222 223 #define TCP_CLEAR_DELACK(tp) \ 224 do { \ 225 if ((tp)->t_flags & TF_DELACK) { \ 226 (tp)->t_flags &= ~TF_DELACK; \ 227 timeout_del(&(tp)->t_delack_to); \ 228 } \ 229 } while (/* CONSTCOND */ 0) 230 231 /* 232 * Handy way of passing around TCP option info. 233 */ 234 struct tcp_opt_info { 235 int ts_present; 236 u_int32_t ts_val; 237 u_int32_t ts_ecr; 238 u_int16_t maxseg; 239 }; 240 241 /* 242 * Data for the TCP compressed state engine. 243 */ 244 union syn_cache_sa { 245 struct sockaddr sa; 246 struct sockaddr_in sin; 247 #if 1 /*def INET6*/ 248 struct sockaddr_in6 sin6; 249 #endif 250 }; 251 252 struct syn_cache { 253 TAILQ_ENTRY(syn_cache) sc_bucketq; /* link on bucket list */ 254 struct timeout sc_timer; /* rexmt timer */ 255 union { /* cached route */ 256 struct route route4; 257 #ifdef INET6 258 struct route_in6 route6; 259 #endif 260 } sc_route_u; 261 #define sc_route4 sc_route_u.route4 262 #ifdef INET6 263 #define sc_route6 sc_route_u.route6 264 #endif 265 long sc_win; /* advertised window */ 266 int sc_bucketidx; /* our bucket index */ 267 u_int32_t sc_hash; 268 u_int32_t sc_timestamp; /* timestamp from SYN */ 269 u_int32_t sc_modulate; /* our timestamp modulator */ 270 #if 0 271 u_int32_t sc_timebase; /* our local timebase */ 272 #endif 273 union syn_cache_sa sc_src; 274 union syn_cache_sa sc_dst; 275 tcp_seq sc_irs; 276 tcp_seq sc_iss; 277 u_int sc_rxtcur; /* current rxt timeout */ 278 u_int sc_rxttot; /* total time spend on queues */ 279 u_short sc_rxtshift; /* for computing backoff */ 280 u_short sc_flags; 281 282 #define SCF_UNREACH 0x0001 /* we've had an unreach error */ 283 #define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */ 284 #define SCF_DEAD 0x0004 /* this entry to be released */ 285 #define SCF_SACK_PERMIT 0x0008 /* permit sack */ 286 #define SCF_ECN_PERMIT 0x0010 /* permit ecn */ 287 #define SCF_SIGNATURE 0x0020 /* enforce tcp signatures */ 288 289 struct mbuf *sc_ipopts; /* IP options */ 290 u_int16_t sc_peermaxseg; 291 u_int16_t sc_ourmaxseg; 292 u_int sc_request_r_scale : 4, 293 sc_requested_s_scale : 4; 294 295 struct tcpcb *sc_tp; /* tcb for listening socket */ 296 LIST_ENTRY(syn_cache) sc_tpq; /* list of entries by same tp */ 297 }; 298 299 struct syn_cache_head { 300 TAILQ_HEAD(, syn_cache) sch_bucket; /* bucket entries */ 301 u_short sch_length; /* # entries in bucket */ 302 }; 303 304 #endif /* _KERNEL */ 305 306 /* 307 * The smoothed round-trip time and estimated variance 308 * are stored as fixed point numbers scaled by the values below. 309 * For convenience, these scales are also used in smoothing the average 310 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 311 * With these scales, srtt has 5 bits to the right of the binary point, 312 * and thus an "ALPHA" of 0.875. rttvar has 4 bits to the right of the 313 * binary point, and is smoothed with an ALPHA of 0.75. 314 */ 315 #define TCP_RTT_SHIFT 3 /* shift for srtt; 5 bits frac. */ 316 #define TCP_RTTVAR_SHIFT 2 /* shift for rttvar; 4 bits */ 317 #define TCP_RTT_BASE_SHIFT 2 /* remaining 2 bit shift */ 318 #define TCP_RTT_MAX (1<<9) /* maximum rtt */ 319 320 /* 321 * The initial retransmission should happen at rtt + 4 * rttvar. 322 * Because of the way we do the smoothing, srtt and rttvar 323 * will each average +1/2 tick of bias. When we compute 324 * the retransmit timer, we want 1/2 tick of rounding and 325 * 1 extra tick because of +-1/2 tick uncertainty in the 326 * firing of the timer. The bias will give us exactly the 327 * 1.5 tick we need. But, because the bias is 328 * statistical, we have to test that we don't drop below 329 * the minimum feasible timer (which is 2 ticks). 330 * This macro assumes that the value of (1 << TCP_RTTVAR_SHIFT) 331 * is the same as the multiplier for rttvar. 332 */ 333 #define TCP_REXMTVAL(tp) \ 334 ((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> TCP_RTT_BASE_SHIFT) 335 336 /* 337 * TCP statistics. 338 * Many of these should be kept per connection, 339 * but that's inconvenient at the moment. 340 */ 341 struct tcpstat { 342 u_int32_t tcps_connattempt; /* connections initiated */ 343 u_int32_t tcps_accepts; /* connections accepted */ 344 u_int32_t tcps_connects; /* connections established */ 345 u_int32_t tcps_drops; /* connections dropped */ 346 u_int32_t tcps_conndrops; /* embryonic connections dropped */ 347 u_int32_t tcps_closed; /* conn. closed (includes drops) */ 348 u_int32_t tcps_segstimed; /* segs where we tried to get rtt */ 349 u_int32_t tcps_rttupdated; /* times we succeeded */ 350 u_int32_t tcps_delack; /* delayed acks sent */ 351 u_int32_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 352 u_int32_t tcps_rexmttimeo; /* retransmit timeouts */ 353 u_int32_t tcps_persisttimeo; /* persist timeouts */ 354 u_int32_t tcps_persistdrop; /* connections dropped in persist */ 355 u_int32_t tcps_keeptimeo; /* keepalive timeouts */ 356 u_int32_t tcps_keepprobe; /* keepalive probes sent */ 357 u_int32_t tcps_keepdrops; /* connections dropped in keepalive */ 358 359 u_int32_t tcps_sndtotal; /* total packets sent */ 360 u_int32_t tcps_sndpack; /* data packets sent */ 361 u_int64_t tcps_sndbyte; /* data bytes sent */ 362 u_int32_t tcps_sndrexmitpack; /* data packets retransmitted */ 363 u_int64_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 364 u_int64_t tcps_sndrexmitfast; /* Fast retransmits */ 365 u_int32_t tcps_sndacks; /* ack-only packets sent */ 366 u_int32_t tcps_sndprobe; /* window probes sent */ 367 u_int32_t tcps_sndurg; /* packets sent with URG only */ 368 u_int32_t tcps_sndwinup; /* window update-only packets sent */ 369 u_int32_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 370 371 u_int32_t tcps_rcvtotal; /* total packets received */ 372 u_int32_t tcps_rcvpack; /* packets received in sequence */ 373 u_int64_t tcps_rcvbyte; /* bytes received in sequence */ 374 u_int32_t tcps_rcvbadsum; /* packets received with ccksum errs */ 375 u_int32_t tcps_rcvbadoff; /* packets received with bad offset */ 376 u_int32_t tcps_rcvmemdrop; /* packets dropped for lack of memory */ 377 u_int32_t tcps_rcvnosec; /* packets dropped for lack of ipsec */ 378 u_int32_t tcps_rcvshort; /* packets received too short */ 379 u_int32_t tcps_rcvduppack; /* duplicate-only packets received */ 380 u_int64_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 381 u_int32_t tcps_rcvpartduppack; /* packets with some duplicate data */ 382 u_int64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 383 u_int32_t tcps_rcvoopack; /* out-of-order packets received */ 384 u_int64_t tcps_rcvoobyte; /* out-of-order bytes received */ 385 u_int32_t tcps_rcvpackafterwin; /* packets with data after window */ 386 u_int64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 387 u_int32_t tcps_rcvafterclose; /* packets rcvd after "close" */ 388 u_int32_t tcps_rcvwinprobe; /* rcvd window probe packets */ 389 u_int32_t tcps_rcvdupack; /* rcvd duplicate acks */ 390 u_int32_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 391 u_int32_t tcps_rcvacktooold; /* rcvd acks for old data */ 392 u_int32_t tcps_rcvackpack; /* rcvd ack packets */ 393 u_int64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 394 u_int32_t tcps_rcvwinupd; /* rcvd window update packets */ 395 u_int32_t tcps_pawsdrop; /* segments dropped due to PAWS */ 396 u_int32_t tcps_predack; /* times hdr predict ok for acks */ 397 u_int32_t tcps_preddat; /* times hdr predict ok for data pkts */ 398 399 u_int32_t tcps_pcbhashmiss; /* input packets missing pcb hash */ 400 u_int32_t tcps_noport; /* no socket on port */ 401 u_int32_t tcps_badsyn; /* SYN packet with src==dst rcv'ed */ 402 403 u_int32_t tcps_rcvbadsig; /* rcvd bad/missing TCP signatures */ 404 u_int64_t tcps_rcvgoodsig; /* rcvd good TCP signatures */ 405 u_int32_t tcps_inhwcsum; /* input hardware-checksummed packets */ 406 u_int32_t tcps_outhwcsum; /* output hardware-checksummed packets */ 407 408 /* ECN stats */ 409 u_int32_t tcps_ecn_accepts; /* ecn connections accepted */ 410 u_int32_t tcps_ecn_rcvece; /* # of rcvd ece */ 411 u_int32_t tcps_ecn_rcvcwr; /* # of rcvd cwr */ 412 u_int32_t tcps_ecn_rcvce; /* # of rcvd ce in ip header */ 413 u_int32_t tcps_ecn_sndect; /* # of cwr sent */ 414 u_int32_t tcps_ecn_sndece; /* # of ece sent */ 415 u_int32_t tcps_ecn_sndcwr; /* # of cwr sent */ 416 u_int32_t tcps_cwr_ecn; /* # of cwnd reduced by ecn */ 417 u_int32_t tcps_cwr_frecovery; /* # of cwnd reduced by fastrecovery */ 418 u_int32_t tcps_cwr_timeout; /* # of cwnd reduced by timeout */ 419 420 /* These statistics deal with the SYN cache. */ 421 u_int64_t tcps_sc_added; /* # of entries added */ 422 u_int64_t tcps_sc_completed; /* # of connections completed */ 423 u_int64_t tcps_sc_timed_out; /* # of entries timed out */ 424 u_int64_t tcps_sc_overflowed; /* # dropped due to overflow */ 425 u_int64_t tcps_sc_reset; /* # dropped due to RST */ 426 u_int64_t tcps_sc_unreach; /* # dropped due to ICMP unreach */ 427 u_int64_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */ 428 u_int64_t tcps_sc_aborted; /* # of entries aborted (no mem) */ 429 u_int64_t tcps_sc_dupesyn; /* # of duplicate SYNs received */ 430 u_int64_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */ 431 u_int64_t tcps_sc_collisions; /* # of hash collisions */ 432 u_int64_t tcps_sc_retransmitted;/* # of retransmissions */ 433 434 u_int64_t tcps_conndrained; /* # of connections drained */ 435 436 u_int64_t tcps_sack_recovery_episode; /* SACK recovery episodes */ 437 u_int64_t tcps_sack_rexmits; /* SACK rexmit segments */ 438 u_int64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 439 u_int64_t tcps_sack_rcv_opts; /* SACK options received */ 440 u_int64_t tcps_sack_snd_opts; /* SACK options sent */ 441 }; 442 443 /* 444 * Names for TCP sysctl objects. 445 */ 446 447 #define TCPCTL_RFC1323 1 /* enable/disable RFC1323 timestamps/scaling */ 448 #define TCPCTL_KEEPINITTIME 2 /* TCPT_KEEP value */ 449 #define TCPCTL_KEEPIDLE 3 /* allow tcp_keepidle to be changed */ 450 #define TCPCTL_KEEPINTVL 4 /* allow tcp_keepintvl to be changed */ 451 #define TCPCTL_SLOWHZ 5 /* return kernel idea of PR_SLOWHZ */ 452 #define TCPCTL_BADDYNAMIC 6 /* return bad dynamic port bitmap */ 453 #define TCPCTL_RECVSPACE 7 /* receive buffer space */ 454 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 455 #define TCPCTL_IDENT 9 /* get connection owner */ 456 #define TCPCTL_SACK 10 /* selective acknowledgement, rfc 2018 */ 457 #define TCPCTL_MSSDFLT 11 /* Default maximum segment size */ 458 #define TCPCTL_RSTPPSLIMIT 12 /* RST pps limit */ 459 #define TCPCTL_ACK_ON_PUSH 13 /* ACK immediately on PUSH */ 460 #define TCPCTL_ECN 14 /* RFC3168 ECN */ 461 #define TCPCTL_SYN_CACHE_LIMIT 15 /* max size of comp. state engine */ 462 #define TCPCTL_SYN_BUCKET_LIMIT 16 /* max size of hash bucket */ 463 #define TCPCTL_RFC3390 17 /* enable/disable RFC3390 increased cwnd */ 464 #define TCPCTL_REASS_LIMIT 18 /* max entries for tcp reass queues */ 465 #define TCPCTL_DROP 19 /* drop tcp connection */ 466 #define TCPCTL_SACKHOLE_LIMIT 20 /* max entries for tcp sack queues */ 467 #define TCPCTL_STATS 21 /* TCP statistics */ 468 #define TCPCTL_MAXID 22 469 470 #define TCPCTL_NAMES { \ 471 { 0, 0 }, \ 472 { "rfc1323", CTLTYPE_INT }, \ 473 { "keepinittime", CTLTYPE_INT }, \ 474 { "keepidle", CTLTYPE_INT }, \ 475 { "keepintvl", CTLTYPE_INT }, \ 476 { "slowhz", CTLTYPE_INT }, \ 477 { "baddynamic", CTLTYPE_STRUCT }, \ 478 { "recvspace", CTLTYPE_INT }, \ 479 { "sendspace", CTLTYPE_INT }, \ 480 { "ident", CTLTYPE_STRUCT }, \ 481 { "sack", CTLTYPE_INT }, \ 482 { "mssdflt", CTLTYPE_INT }, \ 483 { "rstppslimit", CTLTYPE_INT }, \ 484 { "ackonpush", CTLTYPE_INT }, \ 485 { "ecn", CTLTYPE_INT }, \ 486 { "syncachelimit", CTLTYPE_INT }, \ 487 { "synbucketlimit", CTLTYPE_INT }, \ 488 { "rfc3390", CTLTYPE_INT }, \ 489 { "reasslimit", CTLTYPE_INT }, \ 490 { "drop", CTLTYPE_STRUCT }, \ 491 { "sackholelimit", CTLTYPE_INT }, \ 492 { "stats", CTLTYPE_STRUCT } \ 493 } 494 495 #define TCPCTL_VARS { \ 496 NULL, \ 497 &tcp_do_rfc1323, \ 498 &tcptv_keep_init, \ 499 &tcp_keepidle, \ 500 &tcp_keepintvl, \ 501 NULL, \ 502 NULL, \ 503 &tcp_recvspace, \ 504 &tcp_sendspace, \ 505 NULL, \ 506 NULL, \ 507 &tcp_mssdflt, \ 508 &tcp_rst_ppslim, \ 509 &tcp_ack_on_push, \ 510 NULL, \ 511 &tcp_syn_cache_limit, \ 512 &tcp_syn_bucket_limit, \ 513 &tcp_do_rfc3390, \ 514 NULL, \ 515 NULL, \ 516 NULL, \ 517 NULL \ 518 } 519 520 struct tcp_ident_mapping { 521 struct sockaddr_storage faddr, laddr; 522 int euid, ruid; 523 }; 524 525 #ifdef _KERNEL 526 extern struct inpcbtable tcbtable; /* head of queue of active tcpcb's */ 527 extern struct tcpstat tcpstat; /* tcp statistics */ 528 extern u_int32_t tcp_now; /* for RFC 1323 timestamps */ 529 extern int tcp_do_rfc1323; /* enabled/disabled? */ 530 extern int tcp_mssdflt; /* default maximum segment size */ 531 extern int tcp_ack_on_push; /* ACK immediately on PUSH */ 532 #ifdef TCP_SACK 533 extern int tcp_do_sack; /* SACK enabled/disabled */ 534 extern struct pool sackhl_pool; 535 extern int tcp_sackhole_limit; /* max entries for tcp sack queues */ 536 #endif 537 extern int tcp_do_ecn; /* RFC3168 ECN enabled/disabled? */ 538 extern int tcp_do_rfc3390; /* RFC3390 Increasing TCP's Initial Window */ 539 540 extern struct pool tcpqe_pool; 541 extern int tcp_reass_limit; /* max entries for tcp reass queues */ 542 543 extern int tcp_syn_cache_limit; /* max entries for compressed state engine */ 544 extern int tcp_syn_bucket_limit;/* max entries per hash bucket */ 545 546 extern int tcp_syn_cache_size; 547 extern struct syn_cache_head tcp_syn_cache[]; 548 extern u_long syn_cache_count; 549 550 int tcp_attach(struct socket *); 551 void tcp_canceltimers(struct tcpcb *); 552 struct tcpcb * 553 tcp_close(struct tcpcb *); 554 void tcp_reaper(void *); 555 int tcp_freeq(struct tcpcb *); 556 #if defined(INET6) && !defined(TCP6) 557 void tcp6_ctlinput(int, struct sockaddr *, void *); 558 #endif 559 void *tcp_ctlinput(int, struct sockaddr *, void *); 560 int tcp_ctloutput(int, struct socket *, int, int, struct mbuf **); 561 struct tcpcb * 562 tcp_disconnect(struct tcpcb *); 563 struct tcpcb * 564 tcp_drop(struct tcpcb *, int); 565 int tcp_dooptions(struct tcpcb *, u_char *, int, struct tcphdr *, 566 struct mbuf *, int, struct tcp_opt_info *); 567 void tcp_init(void); 568 #if defined(INET6) && !defined(TCP6) 569 int tcp6_input(struct mbuf **, int *, int); 570 #endif 571 void tcp_input(struct mbuf *, ...); 572 int tcp_mss(struct tcpcb *, int); 573 void tcp_mss_update(struct tcpcb *); 574 u_int tcp_hdrsz(struct tcpcb *); 575 void tcp_mtudisc(struct inpcb *, int); 576 void tcp_mtudisc_increase(struct inpcb *, int); 577 #ifdef INET6 578 void tcp6_mtudisc(struct inpcb *, int); 579 void tcp6_mtudisc_callback(struct in6_addr *); 580 #endif 581 struct tcpcb * 582 tcp_newtcpcb(struct inpcb *); 583 void tcp_notify(struct inpcb *, int); 584 int tcp_output(struct tcpcb *); 585 void tcp_pulloutofband(struct socket *, u_int, struct mbuf *, int); 586 int tcp_reass(struct tcpcb *, struct tcphdr *, struct mbuf *, int *); 587 void tcp_rscale(struct tcpcb *, u_long); 588 void tcp_respond(struct tcpcb *, caddr_t, struct tcphdr *, tcp_seq, 589 tcp_seq, int); 590 void tcp_setpersist(struct tcpcb *); 591 void tcp_slowtimo(void); 592 struct mbuf * 593 tcp_template(struct tcpcb *); 594 void tcp_trace(short, short, struct tcpcb *, caddr_t, int, int); 595 struct tcpcb * 596 tcp_usrclosed(struct tcpcb *); 597 int tcp_sysctl(int *, u_int, void *, size_t *, void *, size_t); 598 int tcp_usrreq(struct socket *, 599 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *); 600 void tcp_xmit_timer(struct tcpcb *, int); 601 void tcpdropoldhalfopen(struct tcpcb *, u_int16_t); 602 #ifdef TCP_SACK 603 void tcp_sack_option(struct tcpcb *,struct tcphdr *,u_char *,int); 604 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq, tcp_seq); 605 void tcp_del_sackholes(struct tcpcb *, struct tcphdr *); 606 void tcp_clean_sackreport(struct tcpcb *tp); 607 void tcp_sack_adjust(struct tcpcb *tp); 608 struct sackhole * 609 tcp_sack_output(struct tcpcb *tp); 610 int tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 611 #ifdef DEBUG 612 void tcp_print_holes(struct tcpcb *tp); 613 #endif 614 #endif /* TCP_SACK */ 615 #if defined(TCP_SACK) 616 int tcp_newreno(struct tcpcb *, struct tcphdr *); 617 u_long tcp_seq_subtract(u_long, u_long ); 618 #endif /* TCP_SACK */ 619 #ifdef TCP_SIGNATURE 620 int tcp_signature_apply(caddr_t, caddr_t, unsigned int); 621 int tcp_signature(struct tdb *, int, struct mbuf *, struct tcphdr *, 622 int, int, char *); 623 #endif /* TCP_SIGNATURE */ 624 void tcp_set_iss_tsm(struct tcpcb *); 625 626 int syn_cache_add(struct sockaddr *, struct sockaddr *, 627 struct tcphdr *, unsigned int, struct socket *, 628 struct mbuf *, u_char *, int, struct tcp_opt_info *, tcp_seq *); 629 void syn_cache_unreach(struct sockaddr *, struct sockaddr *, 630 struct tcphdr *); 631 struct socket *syn_cache_get(struct sockaddr *, struct sockaddr *, 632 struct tcphdr *, unsigned int, unsigned int, 633 struct socket *so, struct mbuf *); 634 void syn_cache_init(void); 635 void syn_cache_insert(struct syn_cache *, struct tcpcb *); 636 struct syn_cache *syn_cache_lookup(struct sockaddr *, struct sockaddr *, 637 struct syn_cache_head **); 638 void syn_cache_reset(struct sockaddr *, struct sockaddr *, 639 struct tcphdr *); 640 int syn_cache_respond(struct syn_cache *, struct mbuf *); 641 void syn_cache_timer(void *); 642 void syn_cache_cleanup(struct tcpcb *); 643 void syn_cache_reaper(void *); 644 645 #endif /* _KERNEL */ 646 #endif /* _NETINET_TCP_VAR_H_ */ 647