tcp_rndiss.h revision 1.1.1.1
1 /* $OpenBSD: tcp_var.h,v 1.83 2007/06/25 12:17:43 markus Exp $ */ 2 /* $NetBSD: tcp_rndiss.h,v 1.1.1.1 2009/12/01 07:03:10 martti 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_REASSLOCK 0x00080000 /* reassembling or draining */ 96 #define TF_LASTIDLE 0x00100000 /* no outstanding ACK on last send */ 97 #define TF_DEAD 0x00200000 /* dead and to-be-released */ 98 #define TF_PMTUD_PEND 0x00400000 /* Path MTU Discovery pending */ 99 100 struct mbuf *t_template; /* skeletal packet for transmit */ 101 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 102 struct timeout t_delack_to; /* delayed ACK callback */ 103 /* 104 * The following fields are used as in the protocol specification. 105 * See RFC793, Dec. 1981, page 21. 106 */ 107 /* send sequence variables */ 108 tcp_seq snd_una; /* send unacknowledged */ 109 tcp_seq snd_nxt; /* send next */ 110 tcp_seq snd_up; /* send urgent pointer */ 111 tcp_seq snd_wl1; /* window update seg seq number */ 112 tcp_seq snd_wl2; /* window update seg ack number */ 113 tcp_seq iss; /* initial send sequence number */ 114 u_long snd_wnd; /* send window */ 115 #if 1 /*def TCP_SACK*/ 116 int sack_enable; /* enable SACK for this connection */ 117 int snd_numholes; /* number of holes seen by sender */ 118 struct sackhole *snd_holes; /* linked list of holes (sorted) */ 119 #if 1 /*defined(TCP_SACK) && defined(TCP_FACK)*/ 120 tcp_seq snd_fack; /* for FACK congestion control */ 121 u_long snd_awnd; /* snd_nxt - snd_fack + */ 122 /* retransmitted data */ 123 int retran_data; /* amount of outstanding retx. data */ 124 #endif /* TCP_FACK */ 125 #endif /* TCP_SACK */ 126 #if 1 /*defined(TCP_SACK) || defined(TCP_ECN)*/ 127 tcp_seq snd_last; /* for use in fast recovery */ 128 #endif 129 /* receive sequence variables */ 130 u_long rcv_wnd; /* receive window */ 131 tcp_seq rcv_nxt; /* receive next */ 132 tcp_seq rcv_up; /* receive urgent pointer */ 133 tcp_seq irs; /* initial receive sequence number */ 134 #if 1 /*def TCP_SACK*/ 135 tcp_seq rcv_lastsack; /* last seq number(+1) sack'd by rcv'r*/ 136 int rcv_numsacks; /* # distinct sack blks present */ 137 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 138 #endif 139 140 /* 141 * Additional variables for this implementation. 142 */ 143 /* receive variables */ 144 tcp_seq rcv_adv; /* advertised window */ 145 /* retransmit variables */ 146 tcp_seq snd_max; /* highest sequence number sent; 147 * used to recognize retransmits 148 */ 149 /* congestion control (for slow start, source quench, retransmit after loss) */ 150 u_long snd_cwnd; /* congestion-controlled window */ 151 u_long snd_ssthresh; /* snd_cwnd size threshold for 152 * for slow start exponential to 153 * linear switch 154 */ 155 u_short t_maxopd; /* mss plus options */ 156 u_short t_peermss; /* peer's maximum segment size */ 157 158 /* 159 * transmit timing stuff. See below for scale of srtt and rttvar. 160 * "Variance" is actually smoothed difference. 161 */ 162 uint32_t t_rcvtime; /* time last segment received */ 163 uint32_t t_rtttime; /* time we started measuring rtt */ 164 tcp_seq t_rtseq; /* sequence number being timed */ 165 short t_srtt; /* smoothed round-trip time */ 166 short t_rttvar; /* variance in round-trip time */ 167 u_short t_rttmin; /* minimum rtt allowed */ 168 u_long max_sndwnd; /* largest window peer has offered */ 169 170 /* out-of-band data */ 171 char t_oobflags; /* have some */ 172 char t_iobc; /* input character */ 173 #define TCPOOB_HAVEDATA 0x01 174 #define TCPOOB_HADDATA 0x02 175 short t_softerror; /* possible error not yet reported */ 176 177 /* RFC 1323 variables */ 178 u_char snd_scale; /* window scaling for send window */ 179 u_char rcv_scale; /* window scaling for recv window */ 180 u_char request_r_scale; /* pending window scaling */ 181 u_char requested_s_scale; 182 u_int32_t ts_recent; /* timestamp echo data */ 183 u_int32_t ts_modulate; /* modulation on timestamp */ 184 u_int32_t ts_recent_age; /* when last updated */ 185 tcp_seq last_ack_sent; 186 187 /* pointer for syn cache entries*/ 188 LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */ 189 190 /* Path-MTU Discovery Information */ 191 u_int t_pmtud_mss_acked; /* MSS acked, lower bound for MTU */ 192 u_int t_pmtud_mtu_sent; /* MTU used, upper bound for MTU */ 193 tcp_seq t_pmtud_th_seq; /* TCP SEQ from ICMP payload */ 194 u_int t_pmtud_nextmtu; /* Advertised Next-Hop MTU from ICMP */ 195 u_short t_pmtud_ip_len; /* IP length from ICMP payload */ 196 u_short t_pmtud_ip_hl; /* IP header length from ICMP payload */ 197 198 int pf; 199 200 struct timeout t_reap_to; /* delayed cleanup timeout */ 201 }; 202 203 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 204 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 205 206 #ifdef _KERNEL 207 extern int tcp_delack_ticks; 208 void tcp_delack(void *); 209 210 #define TCP_INIT_DELACK(tp) \ 211 timeout_set(&(tp)->t_delack_to, tcp_delack, tp) 212 213 #define TCP_RESTART_DELACK(tp) \ 214 timeout_add(&(tp)->t_delack_to, tcp_delack_ticks) 215 216 #define TCP_SET_DELACK(tp) \ 217 do { \ 218 if (((tp)->t_flags & TF_DELACK) == 0) { \ 219 (tp)->t_flags |= TF_DELACK; \ 220 TCP_RESTART_DELACK(tp); \ 221 } \ 222 } while (/*CONSTCOND*/0) 223 224 #define TCP_CLEAR_DELACK(tp) \ 225 do { \ 226 if ((tp)->t_flags & TF_DELACK) { \ 227 (tp)->t_flags &= ~TF_DELACK; \ 228 timeout_del(&(tp)->t_delack_to); \ 229 } \ 230 } while (/*CONSTCOND*/0) 231 232 /* 233 * Handy way of passing around TCP option info. 234 */ 235 struct tcp_opt_info { 236 int ts_present; 237 u_int32_t ts_val; 238 u_int32_t ts_ecr; 239 u_int16_t maxseg; 240 }; 241 242 /* 243 * Data for the TCP compressed state engine. 244 */ 245 union syn_cache_sa { 246 struct sockaddr sa; 247 struct sockaddr_in sin; 248 #if 1 /*def INET6*/ 249 struct sockaddr_in6 sin6; 250 #endif 251 }; 252 253 struct syn_cache { 254 TAILQ_ENTRY(syn_cache) sc_bucketq; /* link on bucket list */ 255 struct timeout sc_timer; /* rexmt timer */ 256 union { /* cached route */ 257 struct route route4; 258 #ifdef INET6 259 struct route_in6 route6; 260 #endif 261 } sc_route_u; 262 #define sc_route4 sc_route_u.route4 263 #ifdef INET6 264 #define sc_route6 sc_route_u.route6 265 #endif 266 long sc_win; /* advertised window */ 267 int sc_bucketidx; /* our bucket index */ 268 u_int32_t sc_hash; 269 u_int32_t sc_timestamp; /* timestamp from SYN */ 270 u_int32_t sc_modulate; /* our timestamp modulator */ 271 #if 0 272 u_int32_t sc_timebase; /* our local timebase */ 273 #endif 274 union syn_cache_sa sc_src; 275 union syn_cache_sa sc_dst; 276 tcp_seq sc_irs; 277 tcp_seq sc_iss; 278 u_int sc_rxtcur; /* current rxt timeout */ 279 u_int sc_rxttot; /* total time spend on queues */ 280 u_short sc_rxtshift; /* for computing backoff */ 281 u_short sc_flags; 282 283 #define SCF_UNREACH 0x0001 /* we've had an unreach error */ 284 #define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */ 285 #define SCF_DEAD 0x0004 /* this entry to be released */ 286 #define SCF_SACK_PERMIT 0x0008 /* permit sack */ 287 #define SCF_ECN_PERMIT 0x0010 /* permit ecn */ 288 #define SCF_SIGNATURE 0x0020 /* enforce tcp signatures */ 289 290 struct mbuf *sc_ipopts; /* IP options */ 291 u_int16_t sc_peermaxseg; 292 u_int16_t sc_ourmaxseg; 293 u_int sc_request_r_scale : 4, 294 sc_requested_s_scale : 4; 295 296 struct tcpcb *sc_tp; /* tcb for listening socket */ 297 LIST_ENTRY(syn_cache) sc_tpq; /* list of entries by same tp */ 298 }; 299 300 struct syn_cache_head { 301 TAILQ_HEAD(, syn_cache) sch_bucket; /* bucket entries */ 302 u_short sch_length; /* # entries in bucket */ 303 }; 304 305 static __inline int tcp_reass_lock_try(struct tcpcb *); 306 static __inline void tcp_reass_unlock(struct tcpcb *); 307 #define tcp_reass_lock(tp) tcp_reass_lock_try(tp) 308 309 static __inline int 310 tcp_reass_lock_try(struct tcpcb *tp) 311 { 312 int s; 313 314 /* Use splvm() due to mbuf allocation. */ 315 s = splvm(); 316 if (tp->t_flags & TF_REASSLOCK) { 317 splx(s); 318 return (0); 319 } 320 tp->t_flags |= TF_REASSLOCK; 321 splx(s); 322 return (1); 323 } 324 325 static __inline void 326 tcp_reass_unlock(struct tcpcb *tp) 327 { 328 int s; 329 330 s = splvm(); 331 tp->t_flags &= ~TF_REASSLOCK; 332 splx(s); 333 } 334 #endif /* _KERNEL */ 335 336 /* 337 * The smoothed round-trip time and estimated variance 338 * are stored as fixed point numbers scaled by the values below. 339 * For convenience, these scales are also used in smoothing the average 340 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 341 * With these scales, srtt has 5 bits to the right of the binary point, 342 * and thus an "ALPHA" of 0.875. rttvar has 4 bits to the right of the 343 * binary point, and is smoothed with an ALPHA of 0.75. 344 */ 345 #define TCP_RTT_SHIFT 3 /* shift for srtt; 5 bits frac. */ 346 #define TCP_RTTVAR_SHIFT 2 /* shift for rttvar; 4 bits */ 347 #define TCP_RTT_BASE_SHIFT 2 /* remaining 2 bit shift */ 348 #define TCP_RTT_MAX (1<<9) /* maximum rtt */ 349 350 /* 351 * The initial retransmission should happen at rtt + 4 * rttvar. 352 * Because of the way we do the smoothing, srtt and rttvar 353 * will each average +1/2 tick of bias. When we compute 354 * the retransmit timer, we want 1/2 tick of rounding and 355 * 1 extra tick because of +-1/2 tick uncertainty in the 356 * firing of the timer. The bias will give us exactly the 357 * 1.5 tick we need. But, because the bias is 358 * statistical, we have to test that we don't drop below 359 * the minimum feasible timer (which is 2 ticks). 360 * This macro assumes that the value of (1 << TCP_RTTVAR_SHIFT) 361 * is the same as the multiplier for rttvar. 362 */ 363 #define TCP_REXMTVAL(tp) \ 364 ((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> TCP_RTT_BASE_SHIFT) 365 366 /* 367 * TCP statistics. 368 * Many of these should be kept per connection, 369 * but that's inconvenient at the moment. 370 */ 371 struct tcpstat { 372 u_int32_t tcps_connattempt; /* connections initiated */ 373 u_int32_t tcps_accepts; /* connections accepted */ 374 u_int32_t tcps_connects; /* connections established */ 375 u_int32_t tcps_drops; /* connections dropped */ 376 u_int32_t tcps_conndrops; /* embryonic connections dropped */ 377 u_int32_t tcps_closed; /* conn. closed (includes drops) */ 378 u_int32_t tcps_segstimed; /* segs where we tried to get rtt */ 379 u_int32_t tcps_rttupdated; /* times we succeeded */ 380 u_int32_t tcps_delack; /* delayed acks sent */ 381 u_int32_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 382 u_int32_t tcps_rexmttimeo; /* retransmit timeouts */ 383 u_int32_t tcps_persisttimeo; /* persist timeouts */ 384 u_int32_t tcps_persistdrop; /* connections dropped in persist */ 385 u_int32_t tcps_keeptimeo; /* keepalive timeouts */ 386 u_int32_t tcps_keepprobe; /* keepalive probes sent */ 387 u_int32_t tcps_keepdrops; /* connections dropped in keepalive */ 388 389 u_int32_t tcps_sndtotal; /* total packets sent */ 390 u_int32_t tcps_sndpack; /* data packets sent */ 391 u_int64_t tcps_sndbyte; /* data bytes sent */ 392 u_int32_t tcps_sndrexmitpack; /* data packets retransmitted */ 393 u_int64_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 394 u_int64_t tcps_sndrexmitfast; /* Fast retransmits */ 395 u_int32_t tcps_sndacks; /* ack-only packets sent */ 396 u_int32_t tcps_sndprobe; /* window probes sent */ 397 u_int32_t tcps_sndurg; /* packets sent with URG only */ 398 u_int32_t tcps_sndwinup; /* window update-only packets sent */ 399 u_int32_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 400 401 u_int32_t tcps_rcvtotal; /* total packets received */ 402 u_int32_t tcps_rcvpack; /* packets received in sequence */ 403 u_int64_t tcps_rcvbyte; /* bytes received in sequence */ 404 u_int32_t tcps_rcvbadsum; /* packets received with ccksum errs */ 405 u_int32_t tcps_rcvbadoff; /* packets received with bad offset */ 406 u_int32_t tcps_rcvmemdrop; /* packets dropped for lack of memory */ 407 u_int32_t tcps_rcvnosec; /* packets dropped for lack of ipsec */ 408 u_int32_t tcps_rcvshort; /* packets received too short */ 409 u_int32_t tcps_rcvduppack; /* duplicate-only packets received */ 410 u_int64_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 411 u_int32_t tcps_rcvpartduppack; /* packets with some duplicate data */ 412 u_int64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 413 u_int32_t tcps_rcvoopack; /* out-of-order packets received */ 414 u_int64_t tcps_rcvoobyte; /* out-of-order bytes received */ 415 u_int32_t tcps_rcvpackafterwin; /* packets with data after window */ 416 u_int64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 417 u_int32_t tcps_rcvafterclose; /* packets rcvd after "close" */ 418 u_int32_t tcps_rcvwinprobe; /* rcvd window probe packets */ 419 u_int32_t tcps_rcvdupack; /* rcvd duplicate acks */ 420 u_int32_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 421 u_int32_t tcps_rcvacktooold; /* rcvd acks for old data */ 422 u_int32_t tcps_rcvackpack; /* rcvd ack packets */ 423 u_int64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 424 u_int32_t tcps_rcvwinupd; /* rcvd window update packets */ 425 u_int32_t tcps_pawsdrop; /* segments dropped due to PAWS */ 426 u_int32_t tcps_predack; /* times hdr predict ok for acks */ 427 u_int32_t tcps_preddat; /* times hdr predict ok for data pkts */ 428 429 u_int32_t tcps_pcbhashmiss; /* input packets missing pcb hash */ 430 u_int32_t tcps_noport; /* no socket on port */ 431 u_int32_t tcps_badsyn; /* SYN packet with src==dst rcv'ed */ 432 433 u_int32_t tcps_rcvbadsig; /* rcvd bad/missing TCP signatures */ 434 u_int64_t tcps_rcvgoodsig; /* rcvd good TCP signatures */ 435 u_int32_t tcps_inhwcsum; /* input hardware-checksummed packets */ 436 u_int32_t tcps_outhwcsum; /* output hardware-checksummed packets */ 437 438 /* ECN stats */ 439 u_int32_t tcps_ecn_accepts; /* ecn connections accepted */ 440 u_int32_t tcps_ecn_rcvece; /* # of rcvd ece */ 441 u_int32_t tcps_ecn_rcvcwr; /* # of rcvd cwr */ 442 u_int32_t tcps_ecn_rcvce; /* # of rcvd ce in ip header */ 443 u_int32_t tcps_ecn_sndect; /* # of cwr sent */ 444 u_int32_t tcps_ecn_sndece; /* # of ece sent */ 445 u_int32_t tcps_ecn_sndcwr; /* # of cwr sent */ 446 u_int32_t tcps_cwr_ecn; /* # of cwnd reduced by ecn */ 447 u_int32_t tcps_cwr_frecovery; /* # of cwnd reduced by fastrecovery */ 448 u_int32_t tcps_cwr_timeout; /* # of cwnd reduced by timeout */ 449 450 /* These statistics deal with the SYN cache. */ 451 u_int64_t tcps_sc_added; /* # of entries added */ 452 u_int64_t tcps_sc_completed; /* # of connections completed */ 453 u_int64_t tcps_sc_timed_out; /* # of entries timed out */ 454 u_int64_t tcps_sc_overflowed; /* # dropped due to overflow */ 455 u_int64_t tcps_sc_reset; /* # dropped due to RST */ 456 u_int64_t tcps_sc_unreach; /* # dropped due to ICMP unreach */ 457 u_int64_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */ 458 u_int64_t tcps_sc_aborted; /* # of entries aborted (no mem) */ 459 u_int64_t tcps_sc_dupesyn; /* # of duplicate SYNs received */ 460 u_int64_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */ 461 u_int64_t tcps_sc_collisions; /* # of hash collisions */ 462 u_int64_t tcps_sc_retransmitted;/* # of retransmissions */ 463 464 u_int64_t tcps_conndrained; /* # of connections drained */ 465 466 u_int64_t tcps_sack_recovery_episode; /* SACK recovery episodes */ 467 u_int64_t tcps_sack_rexmits; /* SACK rexmit segments */ 468 u_int64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 469 u_int64_t tcps_sack_rcv_opts; /* SACK options received */ 470 u_int64_t tcps_sack_snd_opts; /* SACK options sent */ 471 }; 472 473 /* 474 * Names for TCP sysctl objects. 475 */ 476 477 #define TCPCTL_RFC1323 1 /* enable/disable RFC1323 timestamps/scaling */ 478 #define TCPCTL_KEEPINITTIME 2 /* TCPT_KEEP value */ 479 #define TCPCTL_KEEPIDLE 3 /* allow tcp_keepidle to be changed */ 480 #define TCPCTL_KEEPINTVL 4 /* allow tcp_keepintvl to be changed */ 481 #define TCPCTL_SLOWHZ 5 /* return kernel idea of PR_SLOWHZ */ 482 #define TCPCTL_BADDYNAMIC 6 /* return bad dynamic port bitmap */ 483 #define TCPCTL_RECVSPACE 7 /* receive buffer space */ 484 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 485 #define TCPCTL_IDENT 9 /* get connection owner */ 486 #define TCPCTL_SACK 10 /* selective acknowledgement, rfc 2018 */ 487 #define TCPCTL_MSSDFLT 11 /* Default maximum segment size */ 488 #define TCPCTL_RSTPPSLIMIT 12 /* RST pps limit */ 489 #define TCPCTL_ACK_ON_PUSH 13 /* ACK immediately on PUSH */ 490 #define TCPCTL_ECN 14 /* RFC3168 ECN */ 491 #define TCPCTL_SYN_CACHE_LIMIT 15 /* max size of comp. state engine */ 492 #define TCPCTL_SYN_BUCKET_LIMIT 16 /* max size of hash bucket */ 493 #define TCPCTL_RFC3390 17 /* enable/disable RFC3390 increased cwnd */ 494 #define TCPCTL_REASS_LIMIT 18 /* max entries for tcp reass queues */ 495 #define TCPCTL_DROP 19 /* drop tcp connection */ 496 #define TCPCTL_SACKHOLE_LIMIT 20 /* max entries for tcp sack queues */ 497 #define TCPCTL_MAXID 21 498 499 #define TCPCTL_NAMES { \ 500 { 0, 0 }, \ 501 { "rfc1323", CTLTYPE_INT }, \ 502 { "keepinittime", CTLTYPE_INT }, \ 503 { "keepidle", CTLTYPE_INT }, \ 504 { "keepintvl", CTLTYPE_INT }, \ 505 { "slowhz", CTLTYPE_INT }, \ 506 { "baddynamic", CTLTYPE_STRUCT }, \ 507 { "recvspace", CTLTYPE_INT }, \ 508 { "sendspace", CTLTYPE_INT }, \ 509 { "ident", CTLTYPE_STRUCT }, \ 510 { "sack", CTLTYPE_INT }, \ 511 { "mssdflt", CTLTYPE_INT }, \ 512 { "rstppslimit", CTLTYPE_INT }, \ 513 { "ackonpush", CTLTYPE_INT }, \ 514 { "ecn", CTLTYPE_INT }, \ 515 { "syncachelimit", CTLTYPE_INT }, \ 516 { "synbucketlimit", CTLTYPE_INT }, \ 517 { "rfc3390", CTLTYPE_INT }, \ 518 { "reasslimit", CTLTYPE_INT }, \ 519 { "drop", CTLTYPE_STRUCT }, \ 520 { "sackholelimit", CTLTYPE_INT }, \ 521 } 522 523 #define TCPCTL_VARS { \ 524 NULL, \ 525 &tcp_do_rfc1323, \ 526 &tcptv_keep_init, \ 527 &tcp_keepidle, \ 528 &tcp_keepintvl, \ 529 NULL, \ 530 NULL, \ 531 &tcp_recvspace, \ 532 &tcp_sendspace, \ 533 NULL, \ 534 NULL, \ 535 &tcp_mssdflt, \ 536 &tcp_rst_ppslim, \ 537 &tcp_ack_on_push, \ 538 NULL, \ 539 &tcp_syn_cache_limit, \ 540 &tcp_syn_bucket_limit, \ 541 &tcp_do_rfc3390, \ 542 NULL, \ 543 NULL, \ 544 NULL \ 545 } 546 547 struct tcp_ident_mapping { 548 struct sockaddr_storage faddr, laddr; 549 int euid, ruid; 550 }; 551 552 #ifdef _KERNEL 553 extern struct inpcbtable tcbtable; /* head of queue of active tcpcb's */ 554 extern struct tcpstat tcpstat; /* tcp statistics */ 555 extern u_int32_t tcp_now; /* for RFC 1323 timestamps */ 556 extern int tcp_do_rfc1323; /* enabled/disabled? */ 557 extern int tcp_mssdflt; /* default maximum segment size */ 558 extern int tcp_ack_on_push; /* ACK immediately on PUSH */ 559 #ifdef TCP_SACK 560 extern int tcp_do_sack; /* SACK enabled/disabled */ 561 extern struct pool sackhl_pool; 562 extern int tcp_sackhole_limit; /* max entries for tcp sack queues */ 563 #endif 564 extern int tcp_do_ecn; /* RFC3168 ECN enabled/disabled? */ 565 extern int tcp_do_rfc3390; /* RFC3390 Increasing TCP's Initial Window */ 566 567 extern struct pool tcpqe_pool; 568 extern int tcp_reass_limit; /* max entries for tcp reass queues */ 569 570 extern int tcp_syn_cache_limit; /* max entries for compressed state engine */ 571 extern int tcp_syn_bucket_limit;/* max entries per hash bucket */ 572 573 extern int tcp_syn_cache_size; 574 extern struct syn_cache_head tcp_syn_cache[]; 575 extern u_long syn_cache_count; 576 577 int tcp_attach(struct socket *); 578 void tcp_canceltimers(struct tcpcb *); 579 struct tcpcb * 580 tcp_close(struct tcpcb *); 581 void tcp_reaper(void *); 582 int tcp_freeq(struct tcpcb *); 583 #if defined(INET6) && !defined(TCP6) 584 void tcp6_ctlinput(int, struct sockaddr *, void *); 585 #endif 586 void *tcp_ctlinput(int, struct sockaddr *, void *); 587 int tcp_ctloutput(int, struct socket *, int, int, struct mbuf **); 588 struct tcpcb * 589 tcp_disconnect(struct tcpcb *); 590 struct tcpcb * 591 tcp_drop(struct tcpcb *, int); 592 int tcp_dooptions(struct tcpcb *, u_char *, int, struct tcphdr *, 593 struct mbuf *, int, struct tcp_opt_info *); 594 void tcp_drain(void); 595 void tcp_init(void); 596 #if defined(INET6) && !defined(TCP6) 597 int tcp6_input(struct mbuf **, int *, int); 598 #endif 599 void tcp_input(struct mbuf *, ...); 600 int tcp_mss(struct tcpcb *, int); 601 void tcp_mss_update(struct tcpcb *); 602 u_int tcp_hdrsz(struct tcpcb *); 603 void tcp_mtudisc(struct inpcb *, int); 604 void tcp_mtudisc_increase(struct inpcb *, int); 605 #ifdef INET6 606 void tcp6_mtudisc(struct inpcb *, int); 607 void tcp6_mtudisc_callback(struct in6_addr *); 608 #endif 609 struct tcpcb * 610 tcp_newtcpcb(struct inpcb *); 611 void tcp_notify(struct inpcb *, int); 612 int tcp_output(struct tcpcb *); 613 void tcp_pulloutofband(struct socket *, u_int, struct mbuf *, int); 614 int tcp_reass(struct tcpcb *, struct tcphdr *, struct mbuf *, int *); 615 void tcp_rscale(struct tcpcb *, u_long); 616 void tcp_respond(struct tcpcb *, caddr_t, struct mbuf *, tcp_seq, 617 tcp_seq, int); 618 void tcp_setpersist(struct tcpcb *); 619 void tcp_slowtimo(void); 620 struct mbuf * 621 tcp_template(struct tcpcb *); 622 void tcp_trace(short, short, struct tcpcb *, caddr_t, int, int); 623 struct tcpcb * 624 tcp_usrclosed(struct tcpcb *); 625 int tcp_sysctl(int *, u_int, void *, size_t *, void *, size_t); 626 #if defined(INET6) && !defined(TCP6) 627 int tcp6_usrreq(struct socket *, 628 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *); 629 #endif 630 int tcp_usrreq(struct socket *, 631 int, struct mbuf *, struct mbuf *, struct mbuf *); 632 void tcp_xmit_timer(struct tcpcb *, int); 633 void tcpdropoldhalfopen(struct tcpcb *, u_int16_t); 634 #ifdef TCP_SACK 635 void tcp_sack_option(struct tcpcb *,struct tcphdr *,u_char *,int); 636 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq, tcp_seq); 637 void tcp_del_sackholes(struct tcpcb *, struct tcphdr *); 638 void tcp_clean_sackreport(struct tcpcb *tp); 639 void tcp_sack_adjust(struct tcpcb *tp); 640 struct sackhole * 641 tcp_sack_output(struct tcpcb *tp); 642 int tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 643 #ifdef DEBUG 644 void tcp_print_holes(struct tcpcb *tp); 645 #endif 646 #endif /* TCP_SACK */ 647 #if defined(TCP_SACK) 648 int tcp_newreno(struct tcpcb *, struct tcphdr *); 649 u_long tcp_seq_subtract(u_long, u_long ); 650 #endif /* TCP_SACK */ 651 #ifdef TCP_SIGNATURE 652 int tcp_signature_apply(caddr_t, caddr_t, unsigned int); 653 int tcp_signature(struct tdb *, int, struct mbuf *, struct tcphdr *, 654 int, int, char *); 655 #endif /* TCP_SIGNATURE */ 656 void tcp_rndiss_init(void); 657 tcp_seq tcp_rndiss_next(void); 658 u_int16_t 659 tcp_rndiss_encrypt(u_int16_t); 660 void tcp_set_iss_tsm(struct tcpcb *); 661 662 int syn_cache_add(struct sockaddr *, struct sockaddr *, 663 struct tcphdr *, unsigned int, struct socket *, 664 struct mbuf *, u_char *, int, struct tcp_opt_info *, tcp_seq *); 665 void syn_cache_unreach(struct sockaddr *, struct sockaddr *, 666 struct tcphdr *); 667 struct socket *syn_cache_get(struct sockaddr *, struct sockaddr *, 668 struct tcphdr *, unsigned int, unsigned int, 669 struct socket *so, struct mbuf *); 670 void syn_cache_init(void); 671 void syn_cache_insert(struct syn_cache *, struct tcpcb *); 672 struct syn_cache *syn_cache_lookup(struct sockaddr *, struct sockaddr *, 673 struct syn_cache_head **); 674 void syn_cache_reset(struct sockaddr *, struct sockaddr *, 675 struct tcphdr *); 676 int syn_cache_respond(struct syn_cache *, struct mbuf *); 677 void syn_cache_timer(void *); 678 void syn_cache_cleanup(struct tcpcb *); 679 void syn_cache_reaper(void *); 680 681 #endif /* _KERNEL */ 682 #endif /* _NETINET_TCP_VAR_H_ */ 683
Indexes created Tue Sep 30 20:09:53 GMT 2025