1 /* $OpenBSD: tcp_var.h,v 1.162 2022/12/13 18:10:55 claudio 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 int 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 0x0001U /* ack peer immediately */ 81 #define TF_NODELAY 0x0004U /* don't delay packets to coalesce */ 82 #define TF_NOOPT 0x0008U /* don't use tcp options */ 83 #define TF_SENTFIN 0x0010U /* have sent FIN */ 84 #define TF_REQ_SCALE 0x0020U /* have/will request window scaling */ 85 #define TF_RCVD_SCALE 0x0040U /* other side has requested scaling */ 86 #define TF_REQ_TSTMP 0x0080U /* have/will request timestamps */ 87 #define TF_RCVD_TSTMP 0x0100U /* a timestamp was received in SYN */ 88 #define TF_SACK_PERMIT 0x0200U /* other side said I could SACK */ 89 #define TF_SIGNATURE 0x0400U /* require TCP MD5 signature */ 90 #ifdef TCP_ECN 91 #define TF_ECN_PERMIT 0x00008000U /* other side said I could ECN */ 92 #define TF_RCVD_CE 0x00010000U /* send ECE in subsequent segs */ 93 #define TF_SEND_CWR 0x00020000U /* send CWR in next seg */ 94 #define TF_DISABLE_ECN 0x00040000U /* disable ECN for this connection */ 95 #endif 96 #define TF_LASTIDLE 0x00100000U /* no outstanding ACK on last send */ 97 #define TF_PMTUD_PEND 0x00400000U /* Path MTU Discovery pending */ 98 #define TF_NEEDOUTPUT 0x00800000U /* call tcp_output after tcp_input */ 99 #define TF_BLOCKOUTPUT 0x01000000U /* avert tcp_output during tcp_input */ 100 #define TF_NOPUSH 0x02000000U /* don't push */ 101 #define TF_TMR_REXMT 0x04000000U /* retransmit timer armed */ 102 #define TF_TMR_PERSIST 0x08000000U /* retransmit persistence timer armed */ 103 #define TF_TMR_KEEP 0x10000000U /* keep alive timer armed */ 104 #define TF_TMR_2MSL 0x20000000U /* 2*msl quiet time timer armed */ 105 #define TF_TMR_REAPER 0x40000000U /* delayed cleanup timer armed, dead */ 106 #define TF_TMR_DELACK 0x80000000U /* 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_rcvacktime; /* time last ack received */ 165 uint32_t t_sndtime; /* time last segment sent */ 166 uint32_t t_sndacktime; /* time last ack sent */ 167 uint32_t t_rtttime; /* time we started measuring rtt */ 168 tcp_seq t_rtseq; /* sequence number being timed */ 169 int t_srtt; /* smoothed round-trip time */ 170 int t_rttvar; /* variance in round-trip time */ 171 u_int t_rttmin; /* minimum rtt allowed */ 172 u_long max_sndwnd; /* largest window peer has offered */ 173 174 /* out-of-band data */ 175 char t_oobflags; /* have some */ 176 char t_iobc; /* input character */ 177 #define TCPOOB_HAVEDATA 0x01 178 #define TCPOOB_HADDATA 0x02 179 short t_softerror; /* possible error not yet reported */ 180 181 /* RFC 1323 variables */ 182 u_char snd_scale; /* window scaling for send window */ 183 u_char rcv_scale; /* window scaling for recv window */ 184 u_char request_r_scale; /* pending window scaling */ 185 u_char requested_s_scale; 186 u_int32_t ts_recent; /* timestamp echo data */ 187 u_int32_t ts_modulate; /* modulation on timestamp */ 188 u_int32_t ts_recent_age; /* when last updated */ 189 tcp_seq last_ack_sent; 190 191 /* pointer for syn cache entries*/ 192 LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */ 193 194 /* Path-MTU Discovery Information */ 195 u_int t_pmtud_mss_acked; /* MSS acked, lower bound for MTU */ 196 u_int t_pmtud_mtu_sent; /* MTU used, upper bound for MTU */ 197 tcp_seq t_pmtud_th_seq; /* TCP SEQ from ICMP payload */ 198 u_int t_pmtud_nextmtu; /* Advertised Next-Hop MTU from ICMP */ 199 u_short t_pmtud_ip_len; /* IP length from ICMP payload */ 200 u_short t_pmtud_ip_hl; /* IP header length from ICMP payload */ 201 202 int pf; 203 204 /* maintain a few stats per connection: */ 205 u_int t_rcvoopack; /* out-of-order packets received */ 206 u_int t_sndrexmitpack; /* retransmit packets sent */ 207 u_int t_sndzerowin; /* zero-window updates sent */ 208 }; 209 210 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 211 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 212 213 #ifdef _KERNEL 214 /* 215 * Handy way of passing around TCP option info. 216 */ 217 struct tcp_opt_info { 218 int ts_present; 219 u_int32_t ts_val; 220 u_int32_t ts_ecr; 221 u_int16_t maxseg; 222 }; 223 224 /* 225 * Data for the TCP compressed state engine. 226 */ 227 228 #define TCP_SYN_HASH_SIZE 293 229 #define TCP_SYN_BUCKET_SIZE 35 230 231 union syn_cache_sa { 232 struct sockaddr sa; 233 struct sockaddr_in sin; 234 struct sockaddr_in6 sin6; 235 }; 236 237 struct syn_cache { 238 TAILQ_ENTRY(syn_cache) sc_bucketq; /* link on bucket list */ 239 struct timeout sc_timer; /* rexmt timer */ 240 union { /* cached route */ 241 struct route route4; 242 #ifdef INET6 243 struct route_in6 route6; 244 #endif 245 } sc_route_u; 246 #define sc_route4 sc_route_u.route4 247 #ifdef INET6 248 #define sc_route6 sc_route_u.route6 249 #endif 250 long sc_win; /* advertised window */ 251 struct syn_cache_head *sc_buckethead; /* our bucket index */ 252 struct syn_cache_set *sc_set; /* our syn cache set */ 253 u_int32_t sc_hash; 254 u_int32_t sc_timestamp; /* timestamp from SYN */ 255 u_int32_t sc_modulate; /* our timestamp modulator */ 256 #if 0 257 u_int32_t sc_timebase; /* our local timebase */ 258 #endif 259 union syn_cache_sa sc_src; 260 union syn_cache_sa sc_dst; 261 tcp_seq sc_irs; 262 tcp_seq sc_iss; 263 u_int sc_rtableid; 264 u_int sc_rxtcur; /* current rxt timeout */ 265 u_int sc_rxttot; /* total time spend on queues */ 266 u_short sc_rxtshift; /* for computing backoff */ 267 u_short sc_flags; 268 269 #define SCF_UNREACH 0x0001 /* we've had an unreach error */ 270 #define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */ 271 #define SCF_DEAD 0x0004 /* this entry to be released */ 272 #define SCF_SACK_PERMIT 0x0008 /* permit sack */ 273 #define SCF_ECN_PERMIT 0x0010 /* permit ecn */ 274 #define SCF_SIGNATURE 0x0020 /* enforce tcp signatures */ 275 276 struct mbuf *sc_ipopts; /* IP options */ 277 u_int16_t sc_peermaxseg; 278 u_int16_t sc_ourmaxseg; 279 u_int sc_request_r_scale : 4, 280 sc_requested_s_scale : 4; 281 282 struct tcpcb *sc_tp; /* tcb for listening socket */ 283 LIST_ENTRY(syn_cache) sc_tpq; /* list of entries by same tp */ 284 }; 285 286 struct syn_cache_head { 287 TAILQ_HEAD(, syn_cache) sch_bucket; /* bucket entries */ 288 u_short sch_length; /* # entries in bucket */ 289 }; 290 291 struct syn_cache_set { 292 struct syn_cache_head *scs_buckethead; 293 int scs_size; 294 int scs_count; 295 int scs_use; 296 u_int32_t scs_random[5]; 297 }; 298 299 #endif /* _KERNEL */ 300 301 /* 302 * The smoothed round-trip time and estimated variance 303 * are stored as fixed point numbers scaled by the values below. 304 * For convenience, these scales are also used in smoothing the average 305 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 306 * With these scales, srtt has 5 bits to the right of the binary point, 307 * and thus an "ALPHA" of 0.875. rttvar has 4 bits to the right of the 308 * binary point, and is smoothed with an ALPHA of 0.75. 309 */ 310 #define TCP_RTT_SHIFT 3 /* shift for srtt; 5 bits frac. */ 311 #define TCP_RTTVAR_SHIFT 2 /* shift for rttvar; 4 bits */ 312 #define TCP_RTT_BASE_SHIFT 2 /* remaining 2 bit shift */ 313 #define TCP_RTT_MAX (1<<18) /* maximum rtt */ 314 315 /* 316 * The initial retransmission should happen at rtt + 4 * rttvar. 317 * Because of the way we do the smoothing, srtt and rttvar 318 * will each average +1/2 tick of bias. When we compute 319 * the retransmit timer, we want 1/2 tick of rounding and 320 * 1 extra tick because of +-1/2 tick uncertainty in the 321 * firing of the timer. The bias will give us exactly the 322 * 1.5 tick we need. But, because the bias is 323 * statistical, we have to test that we don't drop below 324 * the minimum feasible timer (which is 2 ticks). 325 * This macro assumes that the value of (1 << TCP_RTTVAR_SHIFT) 326 * is the same as the multiplier for rttvar. 327 */ 328 #define TCP_REXMTVAL(tp) \ 329 ((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> TCP_RTT_BASE_SHIFT) 330 331 /* 332 * TCP statistics. 333 * Many of these should be kept per connection, 334 * but that's inconvenient at the moment. 335 */ 336 struct tcpstat { 337 u_int32_t tcps_connattempt; /* connections initiated */ 338 u_int32_t tcps_accepts; /* connections accepted */ 339 u_int32_t tcps_connects; /* connections established */ 340 u_int32_t tcps_drops; /* connections dropped */ 341 u_int32_t tcps_conndrops; /* embryonic connections dropped */ 342 u_int32_t tcps_closed; /* conn. closed (includes drops) */ 343 u_int32_t tcps_segstimed; /* segs where we tried to get rtt */ 344 u_int32_t tcps_rttupdated; /* times we succeeded */ 345 u_int32_t tcps_delack; /* delayed acks sent */ 346 u_int32_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 347 u_int32_t tcps_rexmttimeo; /* retransmit timeouts */ 348 u_int32_t tcps_persisttimeo; /* persist timeouts */ 349 u_int32_t tcps_persistdrop; /* connections dropped in persist */ 350 u_int32_t tcps_keeptimeo; /* keepalive timeouts */ 351 u_int32_t tcps_keepprobe; /* keepalive probes sent */ 352 u_int32_t tcps_keepdrops; /* connections dropped in keepalive */ 353 354 u_int32_t tcps_sndtotal; /* total packets sent */ 355 u_int32_t tcps_sndpack; /* data packets sent */ 356 u_int64_t tcps_sndbyte; /* data bytes sent */ 357 u_int32_t tcps_sndrexmitpack; /* data packets retransmitted */ 358 u_int64_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 359 u_int64_t tcps_sndrexmitfast; /* Fast retransmits */ 360 u_int32_t tcps_sndacks; /* ack-only packets sent */ 361 u_int32_t tcps_sndprobe; /* window probes sent */ 362 u_int32_t tcps_sndurg; /* packets sent with URG only */ 363 u_int32_t tcps_sndwinup; /* window update-only packets sent */ 364 u_int32_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 365 366 u_int32_t tcps_rcvtotal; /* total packets received */ 367 u_int32_t tcps_rcvpack; /* packets received in sequence */ 368 u_int64_t tcps_rcvbyte; /* bytes received in sequence */ 369 u_int32_t tcps_rcvbadsum; /* packets received with ccksum errs */ 370 u_int32_t tcps_rcvbadoff; /* packets received with bad offset */ 371 u_int32_t tcps_rcvmemdrop; /* packets dropped for lack of memory */ 372 u_int32_t tcps_rcvnosec; /* packets dropped for lack of ipsec */ 373 u_int32_t tcps_rcvshort; /* packets received too short */ 374 u_int32_t tcps_rcvduppack; /* duplicate-only packets received */ 375 u_int64_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 376 u_int32_t tcps_rcvpartduppack; /* packets with some duplicate data */ 377 u_int64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 378 u_int32_t tcps_rcvoopack; /* out-of-order packets received */ 379 u_int64_t tcps_rcvoobyte; /* out-of-order bytes received */ 380 u_int32_t tcps_rcvpackafterwin; /* packets with data after window */ 381 u_int64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 382 u_int32_t tcps_rcvafterclose; /* packets rcvd after "close" */ 383 u_int32_t tcps_rcvwinprobe; /* rcvd window probe packets */ 384 u_int32_t tcps_rcvdupack; /* rcvd duplicate acks */ 385 u_int32_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 386 u_int32_t tcps_rcvacktooold; /* rcvd acks for old data */ 387 u_int32_t tcps_rcvackpack; /* rcvd ack packets */ 388 u_int64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 389 u_int32_t tcps_rcvwinupd; /* rcvd window update packets */ 390 u_int32_t tcps_pawsdrop; /* segments dropped due to PAWS */ 391 u_int32_t tcps_predack; /* times hdr predict ok for acks */ 392 u_int32_t tcps_preddat; /* times hdr predict ok for data pkts */ 393 394 u_int32_t tcps_pcbhashmiss; /* input packets missing pcb hash */ 395 u_int32_t tcps_noport; /* no socket on port */ 396 u_int32_t tcps_badsyn; /* SYN packet with src==dst rcv'ed */ 397 u_int32_t tcps_dropsyn; /* SYN packet dropped */ 398 399 u_int32_t tcps_rcvbadsig; /* rcvd bad/missing TCP signatures */ 400 u_int64_t tcps_rcvgoodsig; /* rcvd good TCP signatures */ 401 u_int32_t tcps_inswcsum; /* input software-checksummed packets */ 402 u_int32_t tcps_outswcsum; /* output software-checksummed packets */ 403 404 /* ECN stats */ 405 u_int32_t tcps_ecn_accepts; /* ecn connections accepted */ 406 u_int32_t tcps_ecn_rcvece; /* # of rcvd ece */ 407 u_int32_t tcps_ecn_rcvcwr; /* # of rcvd cwr */ 408 u_int32_t tcps_ecn_rcvce; /* # of rcvd ce in ip header */ 409 u_int32_t tcps_ecn_sndect; /* # of cwr sent */ 410 u_int32_t tcps_ecn_sndece; /* # of ece sent */ 411 u_int32_t tcps_ecn_sndcwr; /* # of cwr sent */ 412 u_int32_t tcps_cwr_ecn; /* # of cwnd reduced by ecn */ 413 u_int32_t tcps_cwr_frecovery; /* # of cwnd reduced by fastrecovery */ 414 u_int32_t tcps_cwr_timeout; /* # of cwnd reduced by timeout */ 415 416 /* These statistics deal with the SYN cache. */ 417 u_int64_t tcps_sc_added; /* # of entries added */ 418 u_int64_t tcps_sc_completed; /* # of connections completed */ 419 u_int64_t tcps_sc_timed_out; /* # of entries timed out */ 420 u_int64_t tcps_sc_overflowed; /* # dropped due to overflow */ 421 u_int64_t tcps_sc_reset; /* # dropped due to RST */ 422 u_int64_t tcps_sc_unreach; /* # dropped due to ICMP unreach */ 423 u_int64_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */ 424 u_int64_t tcps_sc_aborted; /* # of entries aborted (no mem) */ 425 u_int64_t tcps_sc_dupesyn; /* # of duplicate SYNs received */ 426 u_int64_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */ 427 u_int64_t tcps_sc_collisions; /* # of hash collisions */ 428 u_int64_t tcps_sc_retransmitted;/* # of retransmissions */ 429 u_int64_t tcps_sc_seedrandom; /* # of syn cache seeds with random */ 430 u_int64_t tcps_sc_hash_size; /* hash buckets in current syn cache */ 431 u_int64_t tcps_sc_entry_count; /* # of entries in current syn cache */ 432 u_int64_t tcps_sc_entry_limit; /* limit of syn cache entries */ 433 u_int64_t tcps_sc_bucket_maxlen;/* maximum # of entries in any bucket */ 434 u_int64_t tcps_sc_bucket_limit; /* limit of syn cache bucket list */ 435 u_int64_t tcps_sc_uses_left; /* use counter of current syn cache */ 436 437 u_int64_t tcps_conndrained; /* # of connections drained */ 438 439 u_int64_t tcps_sack_recovery_episode; /* SACK recovery episodes */ 440 u_int64_t tcps_sack_rexmits; /* SACK rexmit segments */ 441 u_int64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 442 u_int64_t tcps_sack_rcv_opts; /* SACK options received */ 443 u_int64_t tcps_sack_snd_opts; /* SACK options sent */ 444 u_int64_t tcps_sack_drop_opts; /* SACK options dropped */ 445 }; 446 447 /* 448 * Names for TCP sysctl objects. 449 */ 450 451 #define TCPCTL_RFC1323 1 /* enable/disable RFC1323 timestamps/scaling */ 452 #define TCPCTL_KEEPINITTIME 2 /* TCPT_KEEP value */ 453 #define TCPCTL_KEEPIDLE 3 /* allow tcp_keepidle to be changed */ 454 #define TCPCTL_KEEPINTVL 4 /* allow tcp_keepintvl to be changed */ 455 #define TCPCTL_SLOWHZ 5 /* return kernel idea of PR_SLOWHZ */ 456 #define TCPCTL_BADDYNAMIC 6 /* return bad dynamic port bitmap */ 457 #define TCPCTL_RECVSPACE 7 /* receive buffer space */ 458 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 459 #define TCPCTL_IDENT 9 /* get connection owner */ 460 #define TCPCTL_SACK 10 /* selective acknowledgement, rfc 2018 */ 461 #define TCPCTL_MSSDFLT 11 /* Default maximum segment size */ 462 #define TCPCTL_RSTPPSLIMIT 12 /* RST pps limit */ 463 #define TCPCTL_ACK_ON_PUSH 13 /* ACK immediately on PUSH */ 464 #define TCPCTL_ECN 14 /* RFC3168 ECN */ 465 #define TCPCTL_SYN_CACHE_LIMIT 15 /* max size of comp. state engine */ 466 #define TCPCTL_SYN_BUCKET_LIMIT 16 /* max size of hash bucket */ 467 #define TCPCTL_RFC3390 17 /* enable/disable RFC3390 increased cwnd */ 468 #define TCPCTL_REASS_LIMIT 18 /* max entries for tcp reass queues */ 469 #define TCPCTL_DROP 19 /* drop tcp connection */ 470 #define TCPCTL_SACKHOLE_LIMIT 20 /* max entries for tcp sack queues */ 471 #define TCPCTL_STATS 21 /* TCP statistics */ 472 #define TCPCTL_ALWAYS_KEEPALIVE 22 /* assume SO_KEEPALIVE is always set */ 473 #define TCPCTL_SYN_USE_LIMIT 23 /* number of uses before reseeding hash */ 474 #define TCPCTL_ROOTONLY 24 /* return root only port bitmap */ 475 #define TCPCTL_SYN_HASH_SIZE 25 /* number of buckets in the hash */ 476 #define TCPCTL_MAXID 26 477 478 #define TCPCTL_NAMES { \ 479 { 0, 0 }, \ 480 { "rfc1323", CTLTYPE_INT }, \ 481 { "keepinittime", CTLTYPE_INT }, \ 482 { "keepidle", CTLTYPE_INT }, \ 483 { "keepintvl", CTLTYPE_INT }, \ 484 { NULL, 0 }, \ 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 { "synuselimit", CTLTYPE_INT }, \ 503 { "rootonly", CTLTYPE_STRUCT }, \ 504 { "synhashsize", CTLTYPE_INT }, \ 505 } 506 507 struct tcp_ident_mapping { 508 struct sockaddr_storage faddr, laddr; 509 int euid, ruid; 510 u_int rdomain; 511 }; 512 513 #ifdef _KERNEL 514 515 #include <sys/percpu.h> 516 #include <sys/stat.h> 517 518 enum tcpstat_counters { 519 tcps_connattempt, 520 tcps_accepts, 521 tcps_connects, 522 tcps_drops, 523 tcps_conndrops, 524 tcps_closed, 525 tcps_segstimed, 526 tcps_rttupdated, 527 tcps_delack, 528 tcps_timeoutdrop, 529 tcps_rexmttimeo, 530 tcps_persisttimeo, 531 tcps_persistdrop, 532 tcps_keeptimeo, 533 tcps_keepprobe, 534 tcps_keepdrops, 535 tcps_sndtotal, 536 tcps_sndpack, 537 tcps_sndbyte, 538 tcps_sndrexmitpack, 539 tcps_sndrexmitbyte, 540 tcps_sndrexmitfast, 541 tcps_sndacks, 542 tcps_sndprobe, 543 tcps_sndurg, 544 tcps_sndwinup, 545 tcps_sndctrl, 546 tcps_rcvtotal, 547 tcps_rcvpack, 548 tcps_rcvbyte, 549 tcps_rcvbadsum, 550 tcps_rcvbadoff, 551 tcps_rcvmemdrop, 552 tcps_rcvnosec, 553 tcps_rcvshort, 554 tcps_rcvduppack, 555 tcps_rcvdupbyte, 556 tcps_rcvpartduppack, 557 tcps_rcvpartdupbyte, 558 tcps_rcvoopack, 559 tcps_rcvoobyte, 560 tcps_rcvpackafterwin, 561 tcps_rcvbyteafterwin, 562 tcps_rcvafterclose, 563 tcps_rcvwinprobe, 564 tcps_rcvdupack, 565 tcps_rcvacktoomuch, 566 tcps_rcvacktooold, 567 tcps_rcvackpack, 568 tcps_rcvackbyte, 569 tcps_rcvwinupd, 570 tcps_pawsdrop, 571 tcps_predack, 572 tcps_preddat, 573 tcps_pcbhashmiss, 574 tcps_noport, 575 tcps_badsyn, 576 tcps_dropsyn, 577 tcps_rcvbadsig, 578 tcps_rcvgoodsig, 579 tcps_inswcsum, 580 tcps_outswcsum, 581 tcps_ecn_accepts, 582 tcps_ecn_rcvece, 583 tcps_ecn_rcvcwr, 584 tcps_ecn_rcvce, 585 tcps_ecn_sndect, 586 tcps_ecn_sndece, 587 tcps_ecn_sndcwr, 588 tcps_cwr_ecn, 589 tcps_cwr_frecovery, 590 tcps_cwr_timeout, 591 tcps_sc_added, 592 tcps_sc_completed, 593 tcps_sc_timed_out, 594 tcps_sc_overflowed, 595 tcps_sc_reset, 596 tcps_sc_unreach, 597 tcps_sc_bucketoverflow, 598 tcps_sc_aborted, 599 tcps_sc_dupesyn, 600 tcps_sc_dropped, 601 tcps_sc_collisions, 602 tcps_sc_retransmitted, 603 tcps_sc_seedrandom, 604 tcps_sc_hash_size, 605 tcps_sc_entry_count, 606 tcps_sc_entry_limit, 607 tcps_sc_bucket_maxlen, 608 tcps_sc_bucket_limit, 609 tcps_sc_uses_left, 610 tcps_conndrained, 611 tcps_sack_recovery_episode, 612 tcps_sack_rexmits, 613 tcps_sack_rexmit_bytes, 614 tcps_sack_rcv_opts, 615 tcps_sack_snd_opts, 616 tcps_sack_drop_opts, 617 tcps_ncounters, 618 }; 619 620 extern struct cpumem *tcpcounters; 621 622 static inline void 623 tcpstat_inc(enum tcpstat_counters c) 624 { 625 counters_inc(tcpcounters, c); 626 } 627 628 static inline void 629 tcpstat_add(enum tcpstat_counters c, uint64_t v) 630 { 631 counters_add(tcpcounters, c, v); 632 } 633 634 static inline void 635 tcpstat_pkt(enum tcpstat_counters pcounter, enum tcpstat_counters bcounter, 636 uint64_t v) 637 { 638 counters_pkt(tcpcounters, pcounter, bcounter, v); 639 } 640 641 static inline uint32_t 642 tcp_now(void) 643 { 644 return (getnsecruntime() / 1000000); 645 } 646 647 #define TCP_TIME_MSEC(_ms) (_ms) /* tcp_now() is in milliseconds */ 648 #define TCP_TIME(_sec) ((_sec) * 1000) 649 650 extern struct mutex tcp_timer_mtx; 651 extern const struct pr_usrreqs tcp_usrreqs; 652 653 #ifdef INET6 654 extern const struct pr_usrreqs tcp6_usrreqs; 655 #endif 656 657 extern struct pool tcpcb_pool; 658 extern struct inpcbtable tcbtable; /* head of queue of active tcpcb's */ 659 extern int tcp_do_rfc1323; /* enabled/disabled? */ 660 extern int tcptv_keep_init; /* time to keep alive the initial SYN packet */ 661 extern int tcp_mssdflt; /* default maximum segment size */ 662 extern int tcp_rst_ppslim; /* maximum outgoing RST packet per second */ 663 extern int tcp_ack_on_push; /* ACK immediately on PUSH */ 664 extern int tcp_do_sack; /* SACK enabled/disabled */ 665 extern struct pool sackhl_pool; 666 extern int tcp_sackhole_limit; /* max entries for tcp sack queues */ 667 extern int tcp_do_ecn; /* RFC3168 ECN enabled/disabled? */ 668 extern int tcp_do_rfc3390; /* RFC3390 Increasing TCP's Initial Window */ 669 670 extern struct pool tcpqe_pool; 671 extern int tcp_reass_limit; /* max entries for tcp reass queues */ 672 673 extern int tcp_syn_hash_size; /* adjustable size of the hash array */ 674 extern int tcp_syn_cache_limit; /* max entries for compressed state engine */ 675 extern int tcp_syn_bucket_limit;/* max entries per hash bucket */ 676 extern int tcp_syn_use_limit; /* number of uses before reseeding hash */ 677 extern struct syn_cache_set tcp_syn_cache[]; 678 extern int tcp_syn_cache_active; /* active syn cache, may be 0 or 1 */ 679 680 void tcp_canceltimers(struct tcpcb *); 681 struct tcpcb * 682 tcp_close(struct tcpcb *); 683 int tcp_freeq(struct tcpcb *); 684 #ifdef INET6 685 void tcp6_ctlinput(int, struct sockaddr *, u_int, void *); 686 #endif 687 void tcp_ctlinput(int, struct sockaddr *, u_int, void *); 688 int tcp_ctloutput(int, struct socket *, int, int, struct mbuf *); 689 struct tcpcb * 690 tcp_dodisconnect(struct tcpcb *); 691 struct tcpcb * 692 tcp_drop(struct tcpcb *, int); 693 int tcp_dooptions(struct tcpcb *, u_char *, int, struct tcphdr *, 694 struct mbuf *, int, struct tcp_opt_info *, u_int, uint32_t); 695 void tcp_init(void); 696 int tcp_input(struct mbuf **, int *, int, int); 697 int tcp_mss(struct tcpcb *, int); 698 void tcp_mss_update(struct tcpcb *); 699 u_int tcp_hdrsz(struct tcpcb *); 700 void tcp_mtudisc(struct inpcb *, int); 701 void tcp_mtudisc_increase(struct inpcb *, int); 702 #ifdef INET6 703 void tcp6_mtudisc(struct inpcb *, int); 704 void tcp6_mtudisc_callback(struct sockaddr_in6 *, u_int); 705 #endif 706 struct tcpcb * 707 tcp_newtcpcb(struct inpcb *, int); 708 void tcp_notify(struct inpcb *, int); 709 int tcp_output(struct tcpcb *); 710 void tcp_pulloutofband(struct socket *, u_int, struct mbuf *, int); 711 int tcp_reass(struct tcpcb *, struct tcphdr *, struct mbuf *, int *); 712 void tcp_rscale(struct tcpcb *, u_long); 713 void tcp_respond(struct tcpcb *, caddr_t, struct tcphdr *, tcp_seq, 714 tcp_seq, int, u_int, uint32_t); 715 void tcp_setpersist(struct tcpcb *); 716 void tcp_update_sndspace(struct tcpcb *); 717 void tcp_update_rcvspace(struct tcpcb *); 718 void tcp_slowtimo(void); 719 struct mbuf * 720 tcp_template(struct tcpcb *); 721 #ifndef SMALL_KERNEL 722 void tcp_trace(short, short, struct tcpcb *, struct tcpcb *, caddr_t, 723 int, int); 724 #endif 725 struct tcpcb * 726 tcp_usrclosed(struct tcpcb *); 727 int tcp_sysctl(int *, u_int, void *, size_t *, void *, size_t); 728 int tcp_attach(struct socket *, int, int); 729 int tcp_detach(struct socket *); 730 int tcp_bind(struct socket *, struct mbuf *, struct proc *); 731 int tcp_listen(struct socket *); 732 int tcp_connect(struct socket *, struct mbuf *); 733 int tcp_accept(struct socket *, struct mbuf *); 734 int tcp_disconnect(struct socket *); 735 int tcp_shutdown(struct socket *); 736 void tcp_rcvd(struct socket *); 737 int tcp_send(struct socket *, struct mbuf *, struct mbuf *, 738 struct mbuf *); 739 void tcp_abort(struct socket *); 740 int tcp_sockaddr(struct socket *, struct mbuf *); 741 int tcp_peeraddr(struct socket *, struct mbuf *); 742 int tcp_sense(struct socket *, struct stat *); 743 int tcp_rcvoob(struct socket *, struct mbuf *, int); 744 int tcp_sendoob(struct socket *, struct mbuf *, struct mbuf *, 745 struct mbuf *); 746 void tcp_xmit_timer(struct tcpcb *, int); 747 void tcpdropoldhalfopen(struct tcpcb *, u_int16_t); 748 void tcp_sack_option(struct tcpcb *,struct tcphdr *,u_char *,int); 749 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq, tcp_seq); 750 void tcp_del_sackholes(struct tcpcb *, struct tcphdr *); 751 void tcp_clean_sackreport(struct tcpcb *tp); 752 void tcp_sack_adjust(struct tcpcb *tp); 753 struct sackhole * 754 tcp_sack_output(struct tcpcb *tp); 755 #ifdef DEBUG 756 void tcp_print_holes(struct tcpcb *tp); 757 #endif 758 u_long tcp_seq_subtract(u_long, u_long ); 759 #ifdef TCP_SIGNATURE 760 int tcp_signature_apply(caddr_t, caddr_t, unsigned int); 761 int tcp_signature(struct tdb *, int, struct mbuf *, struct tcphdr *, 762 int, int, char *); 763 #endif /* TCP_SIGNATURE */ 764 void tcp_set_iss_tsm(struct tcpcb *); 765 766 void syn_cache_unreach(struct sockaddr *, struct sockaddr *, 767 struct tcphdr *, u_int); 768 void syn_cache_init(void); 769 void syn_cache_cleanup(struct tcpcb *); 770 771 #ifdef SMALL_KERNEL 772 static inline void 773 tcp_trace(short act, short ostate, struct tcpcb *tp, struct tcpcb *otp, 774 caddr_t headers, int req, int len) 775 { 776 } 777 #endif 778 779 #endif /* _KERNEL */ 780 #endif /* _NETINET_TCP_VAR_H_ */ 781