1 /* $OpenBSD: tcp_var.h,v 1.135 2020/08/18 05:21:21 gnezdo 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 #include <sys/timeout.h> 39 40 /* 41 * Kernel variables for tcp. 42 */ 43 44 struct sackblk { 45 tcp_seq start; /* start seq no. of sack block */ 46 tcp_seq end; /* end seq no. */ 47 }; 48 49 struct sackhole { 50 tcp_seq start; /* start seq no. of hole */ 51 tcp_seq end; /* end seq no. */ 52 int dups; /* number of dup(s)acks for this hole */ 53 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ 54 struct sackhole *next; /* next in list */ 55 }; 56 57 /* 58 * TCP sequence queue structures. 59 */ 60 TAILQ_HEAD(tcpqehead, tcpqent); 61 struct tcpqent { 62 TAILQ_ENTRY(tcpqent) tcpqe_q; 63 struct tcphdr *tcpqe_tcp; 64 struct mbuf *tcpqe_m; /* mbuf contains packet */ 65 }; 66 67 /* 68 * Tcp control block, one per tcp; fields: 69 */ 70 struct tcpcb { 71 struct tcpqehead t_segq; /* sequencing queue */ 72 struct timeout t_timer[TCPT_NTIMERS]; /* tcp timers */ 73 short t_state; /* state of this connection */ 74 short t_rxtshift; /* log(2) of rexmt exp. backoff */ 75 short t_rxtcur; /* current retransmit value */ 76 short t_dupacks; /* consecutive dup acks recd */ 77 u_short t_maxseg; /* maximum segment size */ 78 char t_force; /* 1 if forcing out a byte */ 79 u_int t_flags; 80 #define TF_ACKNOW 0x0001 /* ack peer immediately */ 81 #define TF_NODELAY 0x0004 /* don't delay packets to coalesce */ 82 #define TF_NOOPT 0x0008 /* don't use tcp options */ 83 #define TF_SENTFIN 0x0010 /* have sent FIN */ 84 #define TF_REQ_SCALE 0x0020 /* have/will request window scaling */ 85 #define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */ 86 #define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */ 87 #define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */ 88 #define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */ 89 #define TF_SIGNATURE 0x0400 /* require TCP MD5 signature */ 90 #ifdef TCP_ECN 91 #define TF_ECN_PERMIT 0x00008000 /* other side said I could ECN */ 92 #define TF_RCVD_CE 0x00010000 /* send ECE in subsequent segs */ 93 #define TF_SEND_CWR 0x00020000 /* send CWR in next seg */ 94 #define TF_DISABLE_ECN 0x00040000 /* disable ECN for this connection */ 95 #endif 96 #define TF_LASTIDLE 0x00100000 /* no outstanding ACK on last send */ 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 #define TF_TMR_REXMT 0x04000000 /* retransmit timer armed */ 102 #define TF_TMR_PERSIST 0x08000000 /* retransmit persistence timer armed */ 103 #define TF_TMR_KEEP 0x10000000 /* keep alive timer armed */ 104 #define TF_TMR_2MSL 0x20000000 /* 2*msl quiet time timer armed */ 105 #define TF_TMR_REAPER 0x40000000 /* delayed cleanup timer armed, dead */ 106 #define TF_TMR_DELACK 0x80000000 /* delayed ack timer armed */ 107 #define TF_TIMER TF_TMR_REXMT /* used to shift with TCPT values */ 108 109 struct mbuf *t_template; /* skeletal packet for transmit */ 110 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 111 /* 112 * The following fields are used as in the protocol specification. 113 * See RFC793, Dec. 1981, page 21. 114 */ 115 /* send sequence variables */ 116 tcp_seq snd_una; /* send unacknowledged */ 117 tcp_seq snd_nxt; /* send next */ 118 tcp_seq snd_up; /* send urgent pointer */ 119 tcp_seq snd_wl1; /* window update seg seq number */ 120 tcp_seq snd_wl2; /* window update seg ack number */ 121 tcp_seq iss; /* initial send sequence number */ 122 u_long snd_wnd; /* send window */ 123 int sack_enable; /* enable SACK for this connection */ 124 int snd_numholes; /* number of holes seen by sender */ 125 struct sackhole *snd_holes; /* linked list of holes (sorted) */ 126 tcp_seq snd_last; /* for use in fast recovery */ 127 /* receive sequence variables */ 128 u_long rcv_wnd; /* receive window */ 129 tcp_seq rcv_nxt; /* receive next */ 130 tcp_seq rcv_up; /* receive urgent pointer */ 131 tcp_seq irs; /* initial receive sequence number */ 132 tcp_seq rcv_lastsack; /* last seq number(+1) sack'd by rcv'r*/ 133 int rcv_numsacks; /* # distinct sack blks present */ 134 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 135 136 /* 137 * Additional variables for this implementation. 138 */ 139 /* receive variables */ 140 tcp_seq rcv_adv; /* advertised window */ 141 /* retransmit variables */ 142 tcp_seq snd_max; /* highest sequence number sent; 143 * used to recognize retransmits 144 */ 145 /* congestion control (for slow start, source quench, retransmit after loss) */ 146 u_long snd_cwnd; /* congestion-controlled window */ 147 u_long snd_ssthresh; /* snd_cwnd size threshold for 148 * for slow start exponential to 149 * linear switch 150 */ 151 152 /* auto-sizing variables */ 153 u_int rfbuf_cnt; /* recv buffer autoscaling byte count */ 154 u_int32_t rfbuf_ts; /* recv buffer autoscaling time stamp */ 155 156 u_short t_maxopd; /* mss plus options */ 157 u_short t_peermss; /* peer's maximum segment size */ 158 159 /* 160 * transmit timing stuff. See below for scale of srtt and rttvar. 161 * "Variance" is actually smoothed difference. 162 */ 163 uint32_t t_rcvtime; /* time last segment received */ 164 uint32_t t_rtttime; /* time we started measuring rtt */ 165 tcp_seq t_rtseq; /* sequence number being timed */ 166 short t_srtt; /* smoothed round-trip time */ 167 short t_rttvar; /* variance in round-trip time */ 168 u_short t_rttmin; /* minimum rtt allowed */ 169 u_long max_sndwnd; /* largest window peer has offered */ 170 171 /* out-of-band data */ 172 char t_oobflags; /* have some */ 173 char t_iobc; /* input character */ 174 #define TCPOOB_HAVEDATA 0x01 175 #define TCPOOB_HADDATA 0x02 176 short t_softerror; /* possible error not yet reported */ 177 178 /* RFC 1323 variables */ 179 u_char snd_scale; /* window scaling for send window */ 180 u_char rcv_scale; /* window scaling for recv window */ 181 u_char request_r_scale; /* pending window scaling */ 182 u_char requested_s_scale; 183 u_int32_t ts_recent; /* timestamp echo data */ 184 u_int32_t ts_modulate; /* modulation on timestamp */ 185 u_int32_t ts_recent_age; /* when last updated */ 186 tcp_seq last_ack_sent; 187 188 /* pointer for syn cache entries*/ 189 LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */ 190 191 /* Path-MTU Discovery Information */ 192 u_int t_pmtud_mss_acked; /* MSS acked, lower bound for MTU */ 193 u_int t_pmtud_mtu_sent; /* MTU used, upper bound for MTU */ 194 tcp_seq t_pmtud_th_seq; /* TCP SEQ from ICMP payload */ 195 u_int t_pmtud_nextmtu; /* Advertised Next-Hop MTU from ICMP */ 196 u_short t_pmtud_ip_len; /* IP length from ICMP payload */ 197 u_short t_pmtud_ip_hl; /* IP header length from ICMP payload */ 198 199 int pf; 200 }; 201 202 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 203 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 204 205 #ifdef _KERNEL 206 /* 207 * Handy way of passing around TCP option info. 208 */ 209 struct tcp_opt_info { 210 int ts_present; 211 u_int32_t ts_val; 212 u_int32_t ts_ecr; 213 u_int16_t maxseg; 214 }; 215 216 /* 217 * Data for the TCP compressed state engine. 218 */ 219 220 #define TCP_SYN_HASH_SIZE 293 221 #define TCP_SYN_BUCKET_SIZE 35 222 223 union syn_cache_sa { 224 struct sockaddr sa; 225 struct sockaddr_in sin; 226 struct sockaddr_in6 sin6; 227 }; 228 229 struct syn_cache { 230 TAILQ_ENTRY(syn_cache) sc_bucketq; /* link on bucket list */ 231 struct timeout sc_timer; /* rexmt timer */ 232 union { /* cached route */ 233 struct route route4; 234 #ifdef INET6 235 struct route_in6 route6; 236 #endif 237 } sc_route_u; 238 #define sc_route4 sc_route_u.route4 239 #ifdef INET6 240 #define sc_route6 sc_route_u.route6 241 #endif 242 long sc_win; /* advertised window */ 243 struct syn_cache_head *sc_buckethead; /* our bucket index */ 244 struct syn_cache_set *sc_set; /* our syn cache set */ 245 u_int32_t sc_hash; 246 u_int32_t sc_timestamp; /* timestamp from SYN */ 247 u_int32_t sc_modulate; /* our timestamp modulator */ 248 #if 0 249 u_int32_t sc_timebase; /* our local timebase */ 250 #endif 251 union syn_cache_sa sc_src; 252 union syn_cache_sa sc_dst; 253 tcp_seq sc_irs; 254 tcp_seq sc_iss; 255 u_int sc_rtableid; 256 u_int sc_rxtcur; /* current rxt timeout */ 257 u_int sc_rxttot; /* total time spend on queues */ 258 u_short sc_rxtshift; /* for computing backoff */ 259 u_short sc_flags; 260 261 #define SCF_UNREACH 0x0001 /* we've had an unreach error */ 262 #define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */ 263 #define SCF_DEAD 0x0004 /* this entry to be released */ 264 #define SCF_SACK_PERMIT 0x0008 /* permit sack */ 265 #define SCF_ECN_PERMIT 0x0010 /* permit ecn */ 266 #define SCF_SIGNATURE 0x0020 /* enforce tcp signatures */ 267 268 struct mbuf *sc_ipopts; /* IP options */ 269 u_int16_t sc_peermaxseg; 270 u_int16_t sc_ourmaxseg; 271 u_int sc_request_r_scale : 4, 272 sc_requested_s_scale : 4; 273 274 struct tcpcb *sc_tp; /* tcb for listening socket */ 275 LIST_ENTRY(syn_cache) sc_tpq; /* list of entries by same tp */ 276 }; 277 278 struct syn_cache_head { 279 TAILQ_HEAD(, syn_cache) sch_bucket; /* bucket entries */ 280 u_short sch_length; /* # entries in bucket */ 281 }; 282 283 struct syn_cache_set { 284 struct syn_cache_head *scs_buckethead; 285 int scs_size; 286 int scs_count; 287 int scs_use; 288 u_int32_t scs_random[5]; 289 }; 290 291 #endif /* _KERNEL */ 292 293 /* 294 * The smoothed round-trip time and estimated variance 295 * are stored as fixed point numbers scaled by the values below. 296 * For convenience, these scales are also used in smoothing the average 297 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 298 * With these scales, srtt has 5 bits to the right of the binary point, 299 * and thus an "ALPHA" of 0.875. rttvar has 4 bits to the right of the 300 * binary point, and is smoothed with an ALPHA of 0.75. 301 */ 302 #define TCP_RTT_SHIFT 3 /* shift for srtt; 5 bits frac. */ 303 #define TCP_RTTVAR_SHIFT 2 /* shift for rttvar; 4 bits */ 304 #define TCP_RTT_BASE_SHIFT 2 /* remaining 2 bit shift */ 305 #define TCP_RTT_MAX (1<<9) /* maximum rtt */ 306 307 /* 308 * The initial retransmission should happen at rtt + 4 * rttvar. 309 * Because of the way we do the smoothing, srtt and rttvar 310 * will each average +1/2 tick of bias. When we compute 311 * the retransmit timer, we want 1/2 tick of rounding and 312 * 1 extra tick because of +-1/2 tick uncertainty in the 313 * firing of the timer. The bias will give us exactly the 314 * 1.5 tick we need. But, because the bias is 315 * statistical, we have to test that we don't drop below 316 * the minimum feasible timer (which is 2 ticks). 317 * This macro assumes that the value of (1 << TCP_RTTVAR_SHIFT) 318 * is the same as the multiplier for rttvar. 319 */ 320 #define TCP_REXMTVAL(tp) \ 321 ((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> TCP_RTT_BASE_SHIFT) 322 323 /* 324 * TCP statistics. 325 * Many of these should be kept per connection, 326 * but that's inconvenient at the moment. 327 */ 328 struct tcpstat { 329 u_int32_t tcps_connattempt; /* connections initiated */ 330 u_int32_t tcps_accepts; /* connections accepted */ 331 u_int32_t tcps_connects; /* connections established */ 332 u_int32_t tcps_drops; /* connections dropped */ 333 u_int32_t tcps_conndrops; /* embryonic connections dropped */ 334 u_int32_t tcps_closed; /* conn. closed (includes drops) */ 335 u_int32_t tcps_segstimed; /* segs where we tried to get rtt */ 336 u_int32_t tcps_rttupdated; /* times we succeeded */ 337 u_int32_t tcps_delack; /* delayed acks sent */ 338 u_int32_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 339 u_int32_t tcps_rexmttimeo; /* retransmit timeouts */ 340 u_int32_t tcps_persisttimeo; /* persist timeouts */ 341 u_int32_t tcps_persistdrop; /* connections dropped in persist */ 342 u_int32_t tcps_keeptimeo; /* keepalive timeouts */ 343 u_int32_t tcps_keepprobe; /* keepalive probes sent */ 344 u_int32_t tcps_keepdrops; /* connections dropped in keepalive */ 345 346 u_int32_t tcps_sndtotal; /* total packets sent */ 347 u_int32_t tcps_sndpack; /* data packets sent */ 348 u_int64_t tcps_sndbyte; /* data bytes sent */ 349 u_int32_t tcps_sndrexmitpack; /* data packets retransmitted */ 350 u_int64_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 351 u_int64_t tcps_sndrexmitfast; /* Fast retransmits */ 352 u_int32_t tcps_sndacks; /* ack-only packets sent */ 353 u_int32_t tcps_sndprobe; /* window probes sent */ 354 u_int32_t tcps_sndurg; /* packets sent with URG only */ 355 u_int32_t tcps_sndwinup; /* window update-only packets sent */ 356 u_int32_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 357 358 u_int32_t tcps_rcvtotal; /* total packets received */ 359 u_int32_t tcps_rcvpack; /* packets received in sequence */ 360 u_int64_t tcps_rcvbyte; /* bytes received in sequence */ 361 u_int32_t tcps_rcvbadsum; /* packets received with ccksum errs */ 362 u_int32_t tcps_rcvbadoff; /* packets received with bad offset */ 363 u_int32_t tcps_rcvmemdrop; /* packets dropped for lack of memory */ 364 u_int32_t tcps_rcvnosec; /* packets dropped for lack of ipsec */ 365 u_int32_t tcps_rcvshort; /* packets received too short */ 366 u_int32_t tcps_rcvduppack; /* duplicate-only packets received */ 367 u_int64_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 368 u_int32_t tcps_rcvpartduppack; /* packets with some duplicate data */ 369 u_int64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 370 u_int32_t tcps_rcvoopack; /* out-of-order packets received */ 371 u_int64_t tcps_rcvoobyte; /* out-of-order bytes received */ 372 u_int32_t tcps_rcvpackafterwin; /* packets with data after window */ 373 u_int64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 374 u_int32_t tcps_rcvafterclose; /* packets rcvd after "close" */ 375 u_int32_t tcps_rcvwinprobe; /* rcvd window probe packets */ 376 u_int32_t tcps_rcvdupack; /* rcvd duplicate acks */ 377 u_int32_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 378 u_int32_t tcps_rcvacktooold; /* rcvd acks for old data */ 379 u_int32_t tcps_rcvackpack; /* rcvd ack packets */ 380 u_int64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 381 u_int32_t tcps_rcvwinupd; /* rcvd window update packets */ 382 u_int32_t tcps_pawsdrop; /* segments dropped due to PAWS */ 383 u_int32_t tcps_predack; /* times hdr predict ok for acks */ 384 u_int32_t tcps_preddat; /* times hdr predict ok for data pkts */ 385 386 u_int32_t tcps_pcbhashmiss; /* input packets missing pcb hash */ 387 u_int32_t tcps_noport; /* no socket on port */ 388 u_int32_t tcps_badsyn; /* SYN packet with src==dst rcv'ed */ 389 u_int32_t tcps_dropsyn; /* SYN packet dropped */ 390 391 u_int32_t tcps_rcvbadsig; /* rcvd bad/missing TCP signatures */ 392 u_int64_t tcps_rcvgoodsig; /* rcvd good TCP signatures */ 393 u_int32_t tcps_inswcsum; /* input software-checksummed packets */ 394 u_int32_t tcps_outswcsum; /* output software-checksummed packets */ 395 396 /* ECN stats */ 397 u_int32_t tcps_ecn_accepts; /* ecn connections accepted */ 398 u_int32_t tcps_ecn_rcvece; /* # of rcvd ece */ 399 u_int32_t tcps_ecn_rcvcwr; /* # of rcvd cwr */ 400 u_int32_t tcps_ecn_rcvce; /* # of rcvd ce in ip header */ 401 u_int32_t tcps_ecn_sndect; /* # of cwr sent */ 402 u_int32_t tcps_ecn_sndece; /* # of ece sent */ 403 u_int32_t tcps_ecn_sndcwr; /* # of cwr sent */ 404 u_int32_t tcps_cwr_ecn; /* # of cwnd reduced by ecn */ 405 u_int32_t tcps_cwr_frecovery; /* # of cwnd reduced by fastrecovery */ 406 u_int32_t tcps_cwr_timeout; /* # of cwnd reduced by timeout */ 407 408 /* These statistics deal with the SYN cache. */ 409 u_int64_t tcps_sc_added; /* # of entries added */ 410 u_int64_t tcps_sc_completed; /* # of connections completed */ 411 u_int64_t tcps_sc_timed_out; /* # of entries timed out */ 412 u_int64_t tcps_sc_overflowed; /* # dropped due to overflow */ 413 u_int64_t tcps_sc_reset; /* # dropped due to RST */ 414 u_int64_t tcps_sc_unreach; /* # dropped due to ICMP unreach */ 415 u_int64_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */ 416 u_int64_t tcps_sc_aborted; /* # of entries aborted (no mem) */ 417 u_int64_t tcps_sc_dupesyn; /* # of duplicate SYNs received */ 418 u_int64_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */ 419 u_int64_t tcps_sc_collisions; /* # of hash collisions */ 420 u_int64_t tcps_sc_retransmitted;/* # of retransmissions */ 421 u_int64_t tcps_sc_seedrandom; /* # of syn cache seeds with random */ 422 u_int64_t tcps_sc_hash_size; /* hash buckets in current syn cache */ 423 u_int64_t tcps_sc_entry_count; /* # of entries in current syn cache */ 424 u_int64_t tcps_sc_entry_limit; /* limit of syn cache entries */ 425 u_int64_t tcps_sc_bucket_maxlen;/* maximum # of entries in any bucket */ 426 u_int64_t tcps_sc_bucket_limit; /* limit of syn cache bucket list */ 427 u_int64_t tcps_sc_uses_left; /* use counter of current syn cache */ 428 429 u_int64_t tcps_conndrained; /* # of connections drained */ 430 431 u_int64_t tcps_sack_recovery_episode; /* SACK recovery episodes */ 432 u_int64_t tcps_sack_rexmits; /* SACK rexmit segments */ 433 u_int64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 434 u_int64_t tcps_sack_rcv_opts; /* SACK options received */ 435 u_int64_t tcps_sack_snd_opts; /* SACK options sent */ 436 u_int64_t tcps_sack_drop_opts; /* SACK options dropped */ 437 }; 438 439 /* 440 * Names for TCP sysctl objects. 441 */ 442 443 #define TCPCTL_RFC1323 1 /* enable/disable RFC1323 timestamps/scaling */ 444 #define TCPCTL_KEEPINITTIME 2 /* TCPT_KEEP value */ 445 #define TCPCTL_KEEPIDLE 3 /* allow tcp_keepidle to be changed */ 446 #define TCPCTL_KEEPINTVL 4 /* allow tcp_keepintvl to be changed */ 447 #define TCPCTL_SLOWHZ 5 /* return kernel idea of PR_SLOWHZ */ 448 #define TCPCTL_BADDYNAMIC 6 /* return bad dynamic port bitmap */ 449 #define TCPCTL_RECVSPACE 7 /* receive buffer space */ 450 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 451 #define TCPCTL_IDENT 9 /* get connection owner */ 452 #define TCPCTL_SACK 10 /* selective acknowledgement, rfc 2018 */ 453 #define TCPCTL_MSSDFLT 11 /* Default maximum segment size */ 454 #define TCPCTL_RSTPPSLIMIT 12 /* RST pps limit */ 455 #define TCPCTL_ACK_ON_PUSH 13 /* ACK immediately on PUSH */ 456 #define TCPCTL_ECN 14 /* RFC3168 ECN */ 457 #define TCPCTL_SYN_CACHE_LIMIT 15 /* max size of comp. state engine */ 458 #define TCPCTL_SYN_BUCKET_LIMIT 16 /* max size of hash bucket */ 459 #define TCPCTL_RFC3390 17 /* enable/disable RFC3390 increased cwnd */ 460 #define TCPCTL_REASS_LIMIT 18 /* max entries for tcp reass queues */ 461 #define TCPCTL_DROP 19 /* drop tcp connection */ 462 #define TCPCTL_SACKHOLE_LIMIT 20 /* max entries for tcp sack queues */ 463 #define TCPCTL_STATS 21 /* TCP statistics */ 464 #define TCPCTL_ALWAYS_KEEPALIVE 22 /* assume SO_KEEPALIVE is always set */ 465 #define TCPCTL_SYN_USE_LIMIT 23 /* number of uses before reseeding hash */ 466 #define TCPCTL_ROOTONLY 24 /* return root only port bitmap */ 467 #define TCPCTL_SYN_HASH_SIZE 25 /* number of buckets in the hash */ 468 #define TCPCTL_MAXID 26 469 470 #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 { NULL, 0 }, \ 479 { NULL, 0 }, \ 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 { "always_keepalive", CTLTYPE_INT }, \ 494 { "synuselimit", CTLTYPE_INT }, \ 495 { "rootonly", CTLTYPE_STRUCT }, \ 496 { "synhashsize", CTLTYPE_INT }, \ 497 } 498 499 struct tcp_ident_mapping { 500 struct sockaddr_storage faddr, laddr; 501 int euid, ruid; 502 u_int rdomain; 503 }; 504 505 #ifdef _KERNEL 506 507 #include <sys/percpu.h> 508 509 enum tcpstat_counters { 510 tcps_connattempt, 511 tcps_accepts, 512 tcps_connects, 513 tcps_drops, 514 tcps_conndrops, 515 tcps_closed, 516 tcps_segstimed, 517 tcps_rttupdated, 518 tcps_delack, 519 tcps_timeoutdrop, 520 tcps_rexmttimeo, 521 tcps_persisttimeo, 522 tcps_persistdrop, 523 tcps_keeptimeo, 524 tcps_keepprobe, 525 tcps_keepdrops, 526 tcps_sndtotal, 527 tcps_sndpack, 528 tcps_sndbyte, 529 tcps_sndrexmitpack, 530 tcps_sndrexmitbyte, 531 tcps_sndrexmitfast, 532 tcps_sndacks, 533 tcps_sndprobe, 534 tcps_sndurg, 535 tcps_sndwinup, 536 tcps_sndctrl, 537 tcps_rcvtotal, 538 tcps_rcvpack, 539 tcps_rcvbyte, 540 tcps_rcvbadsum, 541 tcps_rcvbadoff, 542 tcps_rcvmemdrop, 543 tcps_rcvnosec, 544 tcps_rcvshort, 545 tcps_rcvduppack, 546 tcps_rcvdupbyte, 547 tcps_rcvpartduppack, 548 tcps_rcvpartdupbyte, 549 tcps_rcvoopack, 550 tcps_rcvoobyte, 551 tcps_rcvpackafterwin, 552 tcps_rcvbyteafterwin, 553 tcps_rcvafterclose, 554 tcps_rcvwinprobe, 555 tcps_rcvdupack, 556 tcps_rcvacktoomuch, 557 tcps_rcvacktooold, 558 tcps_rcvackpack, 559 tcps_rcvackbyte, 560 tcps_rcvwinupd, 561 tcps_pawsdrop, 562 tcps_predack, 563 tcps_preddat, 564 tcps_pcbhashmiss, 565 tcps_noport, 566 tcps_badsyn, 567 tcps_dropsyn, 568 tcps_rcvbadsig, 569 tcps_rcvgoodsig, 570 tcps_inswcsum, 571 tcps_outswcsum, 572 tcps_ecn_accepts, 573 tcps_ecn_rcvece, 574 tcps_ecn_rcvcwr, 575 tcps_ecn_rcvce, 576 tcps_ecn_sndect, 577 tcps_ecn_sndece, 578 tcps_ecn_sndcwr, 579 tcps_cwr_ecn, 580 tcps_cwr_frecovery, 581 tcps_cwr_timeout, 582 tcps_sc_added, 583 tcps_sc_completed, 584 tcps_sc_timed_out, 585 tcps_sc_overflowed, 586 tcps_sc_reset, 587 tcps_sc_unreach, 588 tcps_sc_bucketoverflow, 589 tcps_sc_aborted, 590 tcps_sc_dupesyn, 591 tcps_sc_dropped, 592 tcps_sc_collisions, 593 tcps_sc_retransmitted, 594 tcps_sc_seedrandom, 595 tcps_sc_hash_size, 596 tcps_sc_entry_count, 597 tcps_sc_entry_limit, 598 tcps_sc_bucket_maxlen, 599 tcps_sc_bucket_limit, 600 tcps_sc_uses_left, 601 tcps_conndrained, 602 tcps_sack_recovery_episode, 603 tcps_sack_rexmits, 604 tcps_sack_rexmit_bytes, 605 tcps_sack_rcv_opts, 606 tcps_sack_snd_opts, 607 tcps_sack_drop_opts, 608 tcps_ncounters, 609 }; 610 611 extern struct cpumem *tcpcounters; 612 613 static inline void 614 tcpstat_inc(enum tcpstat_counters c) 615 { 616 counters_inc(tcpcounters, c); 617 } 618 619 static inline void 620 tcpstat_add(enum tcpstat_counters c, uint64_t v) 621 { 622 counters_add(tcpcounters, c, v); 623 } 624 625 static inline void 626 tcpstat_pkt(enum tcpstat_counters pcounter, enum tcpstat_counters bcounter, 627 uint64_t v) 628 { 629 counters_pkt(tcpcounters, pcounter, bcounter, v); 630 } 631 632 extern struct pool tcpcb_pool; 633 extern struct inpcbtable tcbtable; /* head of queue of active tcpcb's */ 634 extern u_int32_t tcp_now; /* for RFC 1323 timestamps */ 635 extern int tcp_do_rfc1323; /* enabled/disabled? */ 636 extern int tcptv_keep_init; /* time to keep alive the initial SYN packet */ 637 extern int tcp_mssdflt; /* default maximum segment size */ 638 extern int tcp_rst_ppslim; /* maximum outgoing RST packet per second */ 639 extern int tcp_ack_on_push; /* ACK immediately on PUSH */ 640 extern int tcp_do_sack; /* SACK enabled/disabled */ 641 extern struct pool sackhl_pool; 642 extern int tcp_sackhole_limit; /* max entries for tcp sack queues */ 643 extern int tcp_do_ecn; /* RFC3168 ECN enabled/disabled? */ 644 extern int tcp_do_rfc3390; /* RFC3390 Increasing TCP's Initial Window */ 645 646 extern struct pool tcpqe_pool; 647 extern int tcp_reass_limit; /* max entries for tcp reass queues */ 648 649 extern int tcp_syn_hash_size; /* adjustable size of the hash array */ 650 extern int tcp_syn_cache_limit; /* max entries for compressed state engine */ 651 extern int tcp_syn_bucket_limit;/* max entries per hash bucket */ 652 extern int tcp_syn_use_limit; /* number of uses before reseeding hash */ 653 extern struct syn_cache_set tcp_syn_cache[]; 654 extern int tcp_syn_cache_active; /* active syn cache, may be 0 or 1 */ 655 656 void tcp_canceltimers(struct tcpcb *); 657 struct tcpcb * 658 tcp_close(struct tcpcb *); 659 int tcp_freeq(struct tcpcb *); 660 #ifdef INET6 661 void tcp6_ctlinput(int, struct sockaddr *, u_int, void *); 662 #endif 663 void tcp_ctlinput(int, struct sockaddr *, u_int, void *); 664 int tcp_ctloutput(int, struct socket *, int, int, struct mbuf *); 665 struct tcpcb * 666 tcp_disconnect(struct tcpcb *); 667 struct tcpcb * 668 tcp_drop(struct tcpcb *, int); 669 int tcp_dooptions(struct tcpcb *, u_char *, int, struct tcphdr *, 670 struct mbuf *, int, struct tcp_opt_info *, u_int); 671 void tcp_init(void); 672 int tcp_input(struct mbuf **, int *, int, int); 673 int tcp_mss(struct tcpcb *, int); 674 void tcp_mss_update(struct tcpcb *); 675 u_int tcp_hdrsz(struct tcpcb *); 676 void tcp_mtudisc(struct inpcb *, int); 677 void tcp_mtudisc_increase(struct inpcb *, int); 678 #ifdef INET6 679 void tcp6_mtudisc(struct inpcb *, int); 680 void tcp6_mtudisc_callback(struct sockaddr_in6 *, u_int); 681 #endif 682 struct tcpcb * 683 tcp_newtcpcb(struct inpcb *); 684 void tcp_notify(struct inpcb *, int); 685 int tcp_output(struct tcpcb *); 686 void tcp_pulloutofband(struct socket *, u_int, struct mbuf *, int); 687 int tcp_reass(struct tcpcb *, struct tcphdr *, struct mbuf *, int *); 688 void tcp_rscale(struct tcpcb *, u_long); 689 void tcp_respond(struct tcpcb *, caddr_t, struct tcphdr *, tcp_seq, 690 tcp_seq, int, u_int); 691 void tcp_setpersist(struct tcpcb *); 692 void tcp_update_sndspace(struct tcpcb *); 693 void tcp_update_rcvspace(struct tcpcb *); 694 void tcp_slowtimo(void); 695 struct mbuf * 696 tcp_template(struct tcpcb *); 697 void tcp_trace(short, short, struct tcpcb *, struct tcpcb *, caddr_t, 698 int, int); 699 struct tcpcb * 700 tcp_usrclosed(struct tcpcb *); 701 int tcp_sysctl(int *, u_int, void *, size_t *, void *, size_t); 702 int tcp_usrreq(struct socket *, 703 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *); 704 int tcp_attach(struct socket *, int); 705 int tcp_detach(struct socket *); 706 void tcp_xmit_timer(struct tcpcb *, int); 707 void tcpdropoldhalfopen(struct tcpcb *, u_int16_t); 708 void tcp_sack_option(struct tcpcb *,struct tcphdr *,u_char *,int); 709 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq, tcp_seq); 710 void tcp_del_sackholes(struct tcpcb *, struct tcphdr *); 711 void tcp_clean_sackreport(struct tcpcb *tp); 712 void tcp_sack_adjust(struct tcpcb *tp); 713 struct sackhole * 714 tcp_sack_output(struct tcpcb *tp); 715 #ifdef DEBUG 716 void tcp_print_holes(struct tcpcb *tp); 717 #endif 718 u_long tcp_seq_subtract(u_long, u_long ); 719 #ifdef TCP_SIGNATURE 720 int tcp_signature_apply(caddr_t, caddr_t, unsigned int); 721 int tcp_signature(struct tdb *, int, struct mbuf *, struct tcphdr *, 722 int, int, char *); 723 #endif /* TCP_SIGNATURE */ 724 void tcp_set_iss_tsm(struct tcpcb *); 725 726 void syn_cache_unreach(struct sockaddr *, struct sockaddr *, 727 struct tcphdr *, u_int); 728 void syn_cache_init(void); 729 void syn_cache_cleanup(struct tcpcb *); 730 731 #endif /* _KERNEL */ 732 #endif /* _NETINET_TCP_VAR_H_ */ 733