1/* $OpenBSD: tcp_var.h,v 1.178 2024/05/13 01:15:53 jsg 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 44struct sackblk { 45 tcp_seq start; /* start seq no. of sack block */ 46 tcp_seq end; /* end seq no. */ 47}; 48 49struct 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 */ 60TAILQ_HEAD(tcpqehead, tcpqent); 61struct 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 */ 70struct 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 uint64_t rfbuf_ts; /* recv buffer autoscaling time stamp */ 154 u_int rfbuf_cnt; /* recv buffer autoscaling byte count */ 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 uint64_t t_rcvtime; /* time last segment received */ 164 uint64_t t_rcvacktime; /* time last ack received */ 165 uint64_t t_sndtime; /* time last segment sent */ 166 uint64_t t_sndacktime; /* time last ack sent */ 167 uint64_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 uint32_t ts_recent; /* timestamp echo data */ 187 uint32_t ts_modulate; /* modulation on timestamp */ 188 uint64_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 */ 217struct 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/* 229 * Locks used to protect global data and struct members: 230 * I immutable after creation 231 * N net lock 232 * S syn_cache_mtx tcp syn cache global mutex 233 */ 234 235extern struct mutex syn_cache_mtx; 236 237#define TCP_SYN_HASH_SIZE 293 238#define TCP_SYN_BUCKET_SIZE 35 239 240union syn_cache_sa { 241 struct sockaddr sa; 242 struct sockaddr_in sin; 243 struct sockaddr_in6 sin6; 244}; 245 246struct syn_cache { 247 TAILQ_ENTRY(syn_cache) sc_bucketq; /* [S] link on bucket list */ 248 struct refcnt sc_refcnt; /* ref count list and timer */ 249 struct timeout sc_timer; /* rexmt timer */ 250 struct route sc_route; /* [N] cached route */ 251 long sc_win; /* [I] advertised window */ 252 struct syn_cache_head *sc_buckethead; /* [S] our bucket index */ 253 struct syn_cache_set *sc_set; /* [S] our syn cache set */ 254 u_int64_t sc_timestamp; /* [N] timestamp from SYN */ 255 u_int32_t sc_hash; /* [S] */ 256 u_int32_t sc_modulate; /* [I] our timestamp modulator */ 257 union syn_cache_sa sc_src; /* [I] */ 258 union syn_cache_sa sc_dst; /* [I] */ 259 tcp_seq sc_irs; /* [I] */ 260 tcp_seq sc_iss; /* [I] */ 261 u_int sc_rtableid; /* [I] */ 262 u_int sc_rxtcur; /* [S] current rxt timeout */ 263 u_int sc_rxttot; /* [S] total time spend on queues */ 264 u_int sc_rxtshift; /* [S] for computing backoff */ 265 u_int sc_dynflags; /* [S] flags accessed with mutex */ 266#define SCF_UNREACH 0x0001U /* we've had an unreach error */ 267#define SCF_DEAD 0x0002U /* this entry to be released */ 268 269 u_short sc_fixflags; /* [I] set during initialization */ 270#define SCF_TIMESTAMP 0x0010U /* peer will do timestamps */ 271#define SCF_SACK_PERMIT 0x0020U /* permit sack */ 272#define SCF_ECN_PERMIT 0x0040U /* permit ecn */ 273#define SCF_SIGNATURE 0x0080U /* enforce tcp signatures */ 274 275 struct mbuf *sc_ipopts; /* [N] IP options */ 276 u_int16_t sc_peermaxseg; /* [I] */ 277 u_int16_t sc_ourmaxseg; /* [I] */ 278 u_int sc_request_r_scale : 4, /* [I] */ 279 sc_requested_s_scale : 4; /* [I] */ 280 281 struct tcpcb *sc_tp; /* [S] tcb for listening socket */ 282 LIST_ENTRY(syn_cache) sc_tpq; /* [S] list of entries by same tp */ 283}; 284 285struct syn_cache_head { 286 TAILQ_HEAD(, syn_cache) sch_bucket; /* [S] bucket entries */ 287 u_short sch_length; /* [S] # entries in bucket */ 288}; 289 290struct syn_cache_set { 291 struct syn_cache_head *scs_buckethead; /* [S] */ 292 long scs_use; /* [S] */ 293 int scs_size; /* [S] current size of hash table */ 294 int scs_count; /* [S] */ 295 u_int32_t scs_random[5]; /* [S] */ 296}; 297 298#endif /* _KERNEL */ 299 300/* 301 * The smoothed round-trip time and estimated variance 302 * are stored as fixed point numbers scaled by the values below. 303 * For convenience, these scales are also used in smoothing the average 304 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 305 * With these scales, srtt has 5 bits to the right of the binary point, 306 * and thus an "ALPHA" of 0.875. rttvar has 4 bits to the right of the 307 * binary point, and is smoothed with an ALPHA of 0.75. 308 */ 309#define TCP_RTT_SHIFT 3 /* shift for srtt; 5 bits frac. */ 310#define TCP_RTTVAR_SHIFT 2 /* shift for rttvar; 4 bits */ 311#define TCP_RTT_BASE_SHIFT 2 /* remaining 2 bit shift */ 312#define TCP_RTT_MAX (1<<18) /* maximum rtt */ 313 314/* 315 * The initial retransmission should happen at rtt + 4 * rttvar. 316 * Because of the way we do the smoothing, srtt and rttvar 317 * will each average +1/2 tick of bias. When we compute 318 * the retransmit timer, we want 1/2 tick of rounding and 319 * 1 extra tick because of +-1/2 tick uncertainty in the 320 * firing of the timer. The bias will give us exactly the 321 * 1.5 tick we need. But, because the bias is 322 * statistical, we have to test that we don't drop below 323 * the minimum feasible timer (which is 2 ticks). 324 * This macro assumes that the value of (1 << TCP_RTTVAR_SHIFT) 325 * is the same as the multiplier for rttvar. 326 */ 327#define TCP_REXMTVAL(tp) \ 328 ((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) \ 329 >> 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 */ 336struct 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 pkts */ 402 u_int32_t tcps_outswcsum; /* output software-checksummed pkts */ 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 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 u_int32_t tcps_outswtso; /* output tso chopped in software */ 447 u_int32_t tcps_outhwtso; /* output tso processed by hardware */ 448 u_int32_t tcps_outpkttso; /* packets generated by tso */ 449 u_int32_t tcps_outbadtso; /* output tso failed, packet dropped */ 450 u_int32_t tcps_inswlro; /* input lro on pseudo device */ 451 u_int32_t tcps_inhwlro; /* input lro from hardware */ 452 u_int32_t tcps_inpktlro; /* packets coalesced by hardware lro */ 453 u_int32_t tcps_inbadlro; /* input bad lro packets */ 454}; 455 456/* 457 * Names for TCP sysctl objects. 458 */ 459 460#define TCPCTL_RFC1323 1 /* enable RFC1323 timestamps/scaling */ 461#define TCPCTL_KEEPINITTIME 2 /* TCPT_KEEP value */ 462#define TCPCTL_KEEPIDLE 3 /* allow tcp_keepidle to be changed */ 463#define TCPCTL_KEEPINTVL 4 /* allow tcp_keepintvl to be changed */ 464#define TCPCTL_SLOWHZ 5 /* return kernel idea of PR_SLOWHZ */ 465#define TCPCTL_BADDYNAMIC 6 /* return bad dynamic port bitmap */ 466#define TCPCTL_RECVSPACE 7 /* receive buffer space */ 467#define TCPCTL_SENDSPACE 8 /* send buffer space */ 468#define TCPCTL_IDENT 9 /* get connection owner */ 469#define TCPCTL_SACK 10 /* selective acknowledgement, rfc 2018 */ 470#define TCPCTL_MSSDFLT 11 /* Default maximum segment size */ 471#define TCPCTL_RSTPPSLIMIT 12 /* RST pps limit */ 472#define TCPCTL_ACK_ON_PUSH 13 /* ACK immediately on PUSH */ 473#define TCPCTL_ECN 14 /* RFC3168 ECN */ 474#define TCPCTL_SYN_CACHE_LIMIT 15 /* max size of comp. state engine */ 475#define TCPCTL_SYN_BUCKET_LIMIT 16 /* max size of hash bucket */ 476#define TCPCTL_RFC3390 17 /* enable/disable RFC3390 increased cwnd */ 477#define TCPCTL_REASS_LIMIT 18 /* max entries for tcp reass queues */ 478#define TCPCTL_DROP 19 /* drop tcp connection */ 479#define TCPCTL_SACKHOLE_LIMIT 20 /* max entries for tcp sack queues */ 480#define TCPCTL_STATS 21 /* TCP statistics */ 481#define TCPCTL_ALWAYS_KEEPALIVE 22 /* assume SO_KEEPALIVE is always set */ 482#define TCPCTL_SYN_USE_LIMIT 23 /* number of uses before reseeding hash */ 483#define TCPCTL_ROOTONLY 24 /* return root only port bitmap */ 484#define TCPCTL_SYN_HASH_SIZE 25 /* number of buckets in the hash */ 485#define TCPCTL_TSO 26 /* enable TCP segmentation offload */ 486#define TCPCTL_MAXID 27 487 488#define TCPCTL_NAMES { \ 489 { 0, 0 }, \ 490 { "rfc1323", CTLTYPE_INT }, \ 491 { "keepinittime", CTLTYPE_INT }, \ 492 { "keepidle", CTLTYPE_INT }, \ 493 { "keepintvl", CTLTYPE_INT }, \ 494 { NULL, 0 }, \ 495 { "baddynamic", CTLTYPE_STRUCT }, \ 496 { NULL, 0 }, \ 497 { NULL, 0 }, \ 498 { "ident", CTLTYPE_STRUCT }, \ 499 { "sack", CTLTYPE_INT }, \ 500 { "mssdflt", CTLTYPE_INT }, \ 501 { "rstppslimit", CTLTYPE_INT }, \ 502 { "ackonpush", CTLTYPE_INT }, \ 503 { "ecn", CTLTYPE_INT }, \ 504 { "syncachelimit", CTLTYPE_INT }, \ 505 { "synbucketlimit", CTLTYPE_INT }, \ 506 { "rfc3390", CTLTYPE_INT }, \ 507 { "reasslimit", CTLTYPE_INT }, \ 508 { "drop", CTLTYPE_STRUCT }, \ 509 { "sackholelimit", CTLTYPE_INT }, \ 510 { "stats", CTLTYPE_STRUCT }, \ 511 { "always_keepalive", CTLTYPE_INT }, \ 512 { "synuselimit", CTLTYPE_INT }, \ 513 { "rootonly", CTLTYPE_STRUCT }, \ 514 { "synhashsize", CTLTYPE_INT }, \ 515 { "tso", CTLTYPE_INT }, \ 516} 517 518struct tcp_ident_mapping { 519 struct sockaddr_storage faddr, laddr; 520 int euid, ruid; 521 u_int rdomain; 522}; 523 524#ifdef _KERNEL 525 526#include <sys/percpu.h> 527#include <sys/stat.h> 528 529enum tcpstat_counters { 530 tcps_connattempt, 531 tcps_accepts, 532 tcps_connects, 533 tcps_drops, 534 tcps_conndrops, 535 tcps_closed, 536 tcps_segstimed, 537 tcps_rttupdated, 538 tcps_delack, 539 tcps_timeoutdrop, 540 tcps_rexmttimeo, 541 tcps_persisttimeo, 542 tcps_persistdrop, 543 tcps_keeptimeo, 544 tcps_keepprobe, 545 tcps_keepdrops, 546 tcps_sndtotal, 547 tcps_sndpack, 548 tcps_sndbyte, 549 tcps_sndrexmitpack, 550 tcps_sndrexmitbyte, 551 tcps_sndrexmitfast, 552 tcps_sndacks, 553 tcps_sndprobe, 554 tcps_sndurg, 555 tcps_sndwinup, 556 tcps_sndctrl, 557 tcps_rcvtotal, 558 tcps_rcvpack, 559 tcps_rcvbyte, 560 tcps_rcvbadsum, 561 tcps_rcvbadoff, 562 tcps_rcvmemdrop, 563 tcps_rcvnosec, 564 tcps_rcvshort, 565 tcps_rcvduppack, 566 tcps_rcvdupbyte, 567 tcps_rcvpartduppack, 568 tcps_rcvpartdupbyte, 569 tcps_rcvoopack, 570 tcps_rcvoobyte, 571 tcps_rcvpackafterwin, 572 tcps_rcvbyteafterwin, 573 tcps_rcvafterclose, 574 tcps_rcvwinprobe, 575 tcps_rcvdupack, 576 tcps_rcvacktoomuch, 577 tcps_rcvacktooold, 578 tcps_rcvackpack, 579 tcps_rcvackbyte, 580 tcps_rcvwinupd, 581 tcps_pawsdrop, 582 tcps_predack, 583 tcps_preddat, 584 tcps_pcbhashmiss, 585 tcps_noport, 586 tcps_badsyn, 587 tcps_dropsyn, 588 tcps_rcvbadsig, 589 tcps_rcvgoodsig, 590 tcps_inswcsum, 591 tcps_outswcsum, 592 tcps_ecn_accepts, 593 tcps_ecn_rcvece, 594 tcps_ecn_rcvcwr, 595 tcps_ecn_rcvce, 596 tcps_ecn_sndect, 597 tcps_ecn_sndece, 598 tcps_ecn_sndcwr, 599 tcps_cwr_ecn, 600 tcps_cwr_frecovery, 601 tcps_cwr_timeout, 602 tcps_sc_added, 603 tcps_sc_completed, 604 tcps_sc_timed_out, 605 tcps_sc_overflowed, 606 tcps_sc_reset, 607 tcps_sc_unreach, 608 tcps_sc_bucketoverflow, 609 tcps_sc_aborted, 610 tcps_sc_dupesyn, 611 tcps_sc_dropped, 612 tcps_sc_collisions, 613 tcps_sc_retransmitted, 614 tcps_sc_seedrandom, 615 tcps_sc_hash_size, 616 tcps_sc_entry_count, 617 tcps_sc_entry_limit, 618 tcps_sc_bucket_maxlen, 619 tcps_sc_bucket_limit, 620 tcps_sc_uses_left, 621 tcps_conndrained, 622 tcps_sack_recovery_episode, 623 tcps_sack_rexmits, 624 tcps_sack_rexmit_bytes, 625 tcps_sack_rcv_opts, 626 tcps_sack_snd_opts, 627 tcps_sack_drop_opts, 628 tcps_outswtso, 629 tcps_outhwtso, 630 tcps_outpkttso, 631 tcps_outbadtso, 632 tcps_inswlro, 633 tcps_inhwlro, 634 tcps_inpktlro, 635 tcps_inbadlro, 636 tcps_ncounters, 637}; 638 639extern struct cpumem *tcpcounters; 640 641static inline void 642tcpstat_inc(enum tcpstat_counters c) 643{ 644 counters_inc(tcpcounters, c); 645} 646 647static inline void 648tcpstat_add(enum tcpstat_counters c, uint64_t v) 649{ 650 counters_add(tcpcounters, c, v); 651} 652 653static inline void 654tcpstat_pkt(enum tcpstat_counters pcounter, enum tcpstat_counters bcounter, 655 uint64_t v) 656{ 657 counters_pkt(tcpcounters, pcounter, bcounter, v); 658} 659 660extern uint64_t tcp_starttime; 661 662static inline uint64_t 663tcp_now(void) 664{ 665 /* TCP time ticks in 63 bit milliseconds with 63 bit random offset. */ 666 return tcp_starttime + (getnsecruntime() / 1000000ULL); 667} 668 669#define TCP_TIME(_sec) ((_sec) * 1000) /* tcp_now() is in milliseconds */ 670 671extern struct mutex tcp_timer_mtx; 672extern const struct pr_usrreqs tcp_usrreqs; 673 674#ifdef INET6 675extern const struct pr_usrreqs tcp6_usrreqs; 676#endif 677 678extern struct pool tcpcb_pool; 679extern struct inpcbtable tcbtable, tcb6table; /* queue of active tcpcb's */ 680extern int tcp_do_rfc1323; /* enabled/disabled? */ 681extern int tcptv_keep_init; /* [N] time to keep alive initial SYN packet */ 682extern int tcp_mssdflt; /* default maximum segment size */ 683extern int tcp_rst_ppslim; /* maximum outgoing RST packet per second */ 684extern int tcp_ack_on_push; /* ACK immediately on PUSH */ 685extern int tcp_do_sack; /* SACK enabled/disabled */ 686extern struct pool sackhl_pool; 687extern int tcp_sackhole_limit; /* max entries for tcp sack queues */ 688extern int tcp_do_ecn; /* RFC3168 ECN enabled/disabled? */ 689extern int tcp_do_rfc3390; /* RFC3390 Increasing TCP's Initial Window */ 690extern int tcp_do_tso; /* enable TSO for TCP output packets */ 691 692extern struct pool tcpqe_pool; 693extern int tcp_reass_limit; /* max entries for tcp reass queues */ 694 695extern int tcp_syn_hash_size; /* adjustable size of the hash array */ 696extern int tcp_syn_cache_limit; /* max entries for compressed state engine */ 697extern int tcp_syn_bucket_limit;/* max entries per hash bucket */ 698extern int tcp_syn_use_limit; /* number of uses before reseeding hash */ 699extern struct syn_cache_set tcp_syn_cache[]; 700extern int tcp_syn_cache_active; /* active syn cache, may be 0 or 1 */ 701 702struct tdb; 703 704void tcp_canceltimers(struct tcpcb *); 705struct tcpcb * 706 tcp_close(struct tcpcb *); 707int tcp_freeq(struct tcpcb *); 708#ifdef INET6 709void tcp6_ctlinput(int, struct sockaddr *, u_int, void *); 710#endif 711void tcp_ctlinput(int, struct sockaddr *, u_int, void *); 712int tcp_ctloutput(int, struct socket *, int, int, struct mbuf *); 713struct tcpcb * 714 tcp_dodisconnect(struct tcpcb *); 715struct tcpcb * 716 tcp_drop(struct tcpcb *, int); 717int tcp_dooptions(struct tcpcb *, u_char *, int, struct tcphdr *, 718 struct mbuf *, int, struct tcp_opt_info *, u_int, uint64_t); 719void tcp_init(void); 720int tcp_input(struct mbuf **, int *, int, int); 721int tcp_mss(struct tcpcb *, int); 722void tcp_mss_update(struct tcpcb *); 723u_int tcp_hdrsz(struct tcpcb *); 724void tcp_mtudisc(struct inpcb *, int); 725void tcp_mtudisc_increase(struct inpcb *, int); 726#ifdef INET6 727void tcp6_mtudisc_callback(struct sockaddr_in6 *, u_int); 728#endif 729struct tcpcb * 730 tcp_newtcpcb(struct inpcb *, int); 731void tcp_notify(struct inpcb *, int); 732int tcp_output(struct tcpcb *); 733int tcp_chopper(struct mbuf *, struct mbuf_list *, struct ifnet *, u_int); 734int tcp_if_output_tso(struct ifnet *, struct mbuf **, struct sockaddr *, 735 struct rtentry *, uint32_t, u_int); 736void tcp_pulloutofband(struct socket *, u_int, struct mbuf *, int); 737int tcp_reass(struct tcpcb *, struct tcphdr *, struct mbuf *, int *); 738void tcp_rscale(struct tcpcb *, u_long); 739void tcp_respond(struct tcpcb *, caddr_t, struct tcphdr *, tcp_seq, 740 tcp_seq, int, u_int, uint64_t); 741void tcp_setpersist(struct tcpcb *); 742void tcp_update_sndspace(struct tcpcb *); 743void tcp_update_rcvspace(struct tcpcb *); 744void tcp_slowtimo(void); 745struct mbuf * 746 tcp_template(struct tcpcb *); 747#ifndef SMALL_KERNEL 748void tcp_trace(short, short, struct tcpcb *, struct tcpcb *, caddr_t, 749 int, int); 750#endif 751struct tcpcb * 752 tcp_usrclosed(struct tcpcb *); 753int tcp_sysctl(int *, u_int, void *, size_t *, void *, size_t); 754int tcp_attach(struct socket *, int, int); 755int tcp_detach(struct socket *); 756int tcp_bind(struct socket *, struct mbuf *, struct proc *); 757int tcp_listen(struct socket *); 758int tcp_connect(struct socket *, struct mbuf *); 759int tcp_accept(struct socket *, struct mbuf *); 760int tcp_disconnect(struct socket *); 761int tcp_shutdown(struct socket *); 762void tcp_rcvd(struct socket *); 763int tcp_send(struct socket *, struct mbuf *, struct mbuf *, 764 struct mbuf *); 765void tcp_abort(struct socket *); 766int tcp_sockaddr(struct socket *, struct mbuf *); 767int tcp_peeraddr(struct socket *, struct mbuf *); 768int tcp_sense(struct socket *, struct stat *); 769int tcp_rcvoob(struct socket *, struct mbuf *, int); 770int tcp_sendoob(struct socket *, struct mbuf *, struct mbuf *, 771 struct mbuf *); 772void tcp_xmit_timer(struct tcpcb *, int32_t); 773void tcp_sack_option(struct tcpcb *,struct tcphdr *,u_char *,int); 774void tcp_update_sack_list(struct tcpcb *tp, tcp_seq, tcp_seq); 775void tcp_del_sackholes(struct tcpcb *, struct tcphdr *); 776void tcp_clean_sackreport(struct tcpcb *tp); 777void tcp_sack_adjust(struct tcpcb *tp); 778struct sackhole * 779 tcp_sack_output(struct tcpcb *tp); 780#ifdef DEBUG 781void tcp_print_holes(struct tcpcb *tp); 782#endif 783u_long tcp_seq_subtract(u_long, u_long ); 784#ifdef TCP_SIGNATURE 785int tcp_signature_apply(caddr_t, caddr_t, unsigned int); 786int tcp_signature(struct tdb *, int, struct mbuf *, struct tcphdr *, 787 int, int, char *); 788#endif /* TCP_SIGNATURE */ 789void tcp_set_iss_tsm(struct tcpcb *); 790 791void syn_cache_unreach(const struct sockaddr *, const struct sockaddr *, 792 struct tcphdr *, u_int); 793void syn_cache_init(void); 794void syn_cache_cleanup(struct tcpcb *); 795 796#ifdef SMALL_KERNEL 797static inline void 798tcp_trace(short act, short ostate, struct tcpcb *tp, struct tcpcb *otp, 799 caddr_t headers, int req, int len) 800{ 801} 802#endif 803 804#endif /* _KERNEL */ 805#endif /* _NETINET_TCP_VAR_H_ */ 806