1 /*- 2 * Copyright (c) 1982, 1986, 1993, 1994, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 30 * $FreeBSD$ 31 */ 32 33 #ifndef _NETINET_TCP_VAR_H_ 34 #define _NETINET_TCP_VAR_H_ 35 36 #include <netinet/tcp.h> 37 38 #ifdef _KERNEL 39 #include <net/vnet.h> 40 41 /* 42 * Kernel variables for tcp. 43 */ 44 VNET_DECLARE(int, tcp_do_rfc1323); 45 #define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323) 46 47 #endif /* _KERNEL */ 48 49 /* TCP segment queue entry */ 50 struct tseg_qent { 51 LIST_ENTRY(tseg_qent) tqe_q; 52 int tqe_len; /* TCP segment data length */ 53 struct tcphdr *tqe_th; /* a pointer to tcp header */ 54 struct mbuf *tqe_m; /* mbuf contains packet */ 55 }; 56 LIST_HEAD(tsegqe_head, tseg_qent); 57 58 struct sackblk { 59 tcp_seq start; /* start seq no. of sack block */ 60 tcp_seq end; /* end seq no. */ 61 }; 62 63 struct sackhole { 64 tcp_seq start; /* start seq no. of hole */ 65 tcp_seq end; /* end seq no. */ 66 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ 67 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */ 68 }; 69 70 struct sackhint { 71 struct sackhole *nexthole; 72 int sack_bytes_rexmit; 73 tcp_seq last_sack_ack; /* Most recent/largest sacked ack */ 74 75 int ispare; /* explicit pad for 64bit alignment */ 76 uint64_t _pad[2]; /* 1 sacked_bytes, 1 TBD */ 77 }; 78 79 struct tcptemp { 80 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 81 struct tcphdr tt_t; 82 }; 83 84 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 85 86 /* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */ 87 #ifdef INET6 88 #define ND6_HINT(tp) \ 89 do { \ 90 if ((tp) && (tp)->t_inpcb && \ 91 ((tp)->t_inpcb->inp_vflag & INP_IPV6) != 0) \ 92 nd6_nud_hint(NULL, NULL, 0); \ 93 } while (0) 94 #else 95 #define ND6_HINT(tp) 96 #endif 97 98 /* 99 * Tcp control block, one per tcp; fields: 100 * Organized for 16 byte cacheline efficiency. 101 */ 102 struct tcpcb { 103 struct tsegqe_head t_segq; /* segment reassembly queue */ 104 void *t_pspare[2]; /* new reassembly queue */ 105 int t_segqlen; /* segment reassembly queue length */ 106 int t_dupacks; /* consecutive dup acks recd */ 107 108 struct tcp_timer *t_timers; /* All the TCP timers in one struct */ 109 110 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 111 int t_state; /* state of this connection */ 112 u_int t_flags; 113 114 struct vnet *t_vnet; /* back pointer to parent vnet */ 115 116 tcp_seq snd_una; /* send unacknowledged */ 117 tcp_seq snd_max; /* highest sequence number sent; 118 * used to recognize retransmits 119 */ 120 tcp_seq snd_nxt; /* send next */ 121 tcp_seq snd_up; /* send urgent pointer */ 122 123 tcp_seq snd_wl1; /* window update seg seq number */ 124 tcp_seq snd_wl2; /* window update seg ack number */ 125 tcp_seq iss; /* initial send sequence number */ 126 tcp_seq irs; /* initial receive sequence number */ 127 128 tcp_seq rcv_nxt; /* receive next */ 129 tcp_seq rcv_adv; /* advertised window */ 130 u_long rcv_wnd; /* receive window */ 131 tcp_seq rcv_up; /* receive urgent pointer */ 132 133 u_long snd_wnd; /* send window */ 134 u_long snd_cwnd; /* congestion-controlled window */ 135 u_long snd_spare1; /* unused */ 136 u_long snd_ssthresh; /* snd_cwnd size threshold for 137 * for slow start exponential to 138 * linear switch 139 */ 140 u_long snd_spare2; /* unused */ 141 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 142 143 u_int t_maxopd; /* mss plus options */ 144 145 u_int t_rcvtime; /* inactivity time */ 146 u_int t_starttime; /* time connection was established */ 147 u_int t_rtttime; /* RTT measurement start time */ 148 tcp_seq t_rtseq; /* sequence number being timed */ 149 150 u_int t_bw_spare1; /* unused */ 151 tcp_seq t_bw_spare2; /* unused */ 152 153 int t_rxtcur; /* current retransmit value (ticks) */ 154 u_int t_maxseg; /* maximum segment size */ 155 int t_srtt; /* smoothed round-trip time */ 156 int t_rttvar; /* variance in round-trip time */ 157 158 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 159 u_int t_rttmin; /* minimum rtt allowed */ 160 u_int t_rttbest; /* best rtt we've seen */ 161 u_long t_rttupdated; /* number of times rtt sampled */ 162 u_long max_sndwnd; /* largest window peer has offered */ 163 164 int t_softerror; /* possible error not yet reported */ 165 /* out-of-band data */ 166 char t_oobflags; /* have some */ 167 char t_iobc; /* input character */ 168 /* RFC 1323 variables */ 169 u_char snd_scale; /* window scaling for send window */ 170 u_char rcv_scale; /* window scaling for recv window */ 171 u_char request_r_scale; /* pending window scaling */ 172 u_int32_t ts_recent; /* timestamp echo data */ 173 u_int ts_recent_age; /* when last updated */ 174 u_int32_t ts_offset; /* our timestamp offset */ 175 176 tcp_seq last_ack_sent; 177 /* experimental */ 178 u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 179 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 180 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 181 int t_sndzerowin; /* zero-window updates sent */ 182 u_int t_badrxtwin; /* window for retransmit recovery */ 183 u_char snd_limited; /* segments limited transmitted */ 184 /* SACK related state */ 185 int snd_numholes; /* number of holes seen by sender */ 186 TAILQ_HEAD(sackhole_head, sackhole) snd_holes; 187 /* SACK scoreboard (sorted) */ 188 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ 189 int rcv_numsacks; /* # distinct sack blks present */ 190 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 191 tcp_seq sack_newdata; /* New data xmitted in this recovery 192 episode starts at this seq number */ 193 struct sackhint sackhint; /* SACK scoreboard hint */ 194 int t_rttlow; /* smallest observerved RTT */ 195 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ 196 int rfbuf_cnt; /* recv buffer autoscaling byte count */ 197 struct toedev *tod; /* toedev handling this connection */ 198 int t_sndrexmitpack; /* retransmit packets sent */ 199 int t_rcvoopack; /* out-of-order packets received */ 200 void *t_toe; /* TOE pcb pointer */ 201 int t_bytes_acked; /* # bytes acked during current RTT */ 202 struct cc_algo *cc_algo; /* congestion control algorithm */ 203 struct cc_var *ccv; /* congestion control specific vars */ 204 struct osd *osd; /* storage for Khelp module data */ 205 206 u_int t_keepinit; /* time to establish connection */ 207 u_int t_keepidle; /* time before keepalive probes begin */ 208 u_int t_keepintvl; /* interval between keepalives */ 209 u_int t_keepcnt; /* number of keepalives before close */ 210 211 u_int t_tsomax; /* tso burst length limit */ 212 213 uint32_t t_ispare[8]; /* 5 UTO, 3 TBD */ 214 void *t_pspare2[4]; /* 4 TBD */ 215 uint64_t _pad[6]; /* 6 TBD (1-2 CC/RTT?) */ 216 }; 217 218 /* 219 * Flags and utility macros for the t_flags field. 220 */ 221 #define TF_ACKNOW 0x000001 /* ack peer immediately */ 222 #define TF_DELACK 0x000002 /* ack, but try to delay it */ 223 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 224 #define TF_NOOPT 0x000008 /* don't use tcp options */ 225 #define TF_SENTFIN 0x000010 /* have sent FIN */ 226 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 227 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 228 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 229 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 230 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 231 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 232 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 233 #define TF_NOPUSH 0x001000 /* don't push */ 234 #define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */ 235 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 236 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 237 #define TF_LASTIDLE 0x040000 /* connection was previously idle */ 238 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 239 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 240 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 241 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 242 #define TF_FORCEDATA 0x800000 /* force out a byte */ 243 #define TF_TSO 0x1000000 /* TSO enabled on this connection */ 244 #define TF_TOE 0x2000000 /* this connection is offloaded */ 245 #define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */ 246 #define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */ 247 #define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */ 248 #define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */ 249 #define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */ 250 251 #define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY) 252 #define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY 253 #define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY 254 255 #define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY) 256 #define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY 257 #define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY 258 259 #define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY)) 260 #define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY) 261 #define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY) 262 263 #define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una) 264 265 /* 266 * Flags for the t_oobflags field. 267 */ 268 #define TCPOOB_HAVEDATA 0x01 269 #define TCPOOB_HADDATA 0x02 270 271 #ifdef TCP_SIGNATURE 272 /* 273 * Defines which are needed by the xform_tcp module and tcp_[in|out]put 274 * for SADB verification and lookup. 275 */ 276 #define TCP_SIGLEN 16 /* length of computed digest in bytes */ 277 #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */ 278 #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */ 279 /* 280 * Only a single SA per host may be specified at this time. An SPI is 281 * needed in order for the KEY_ALLOCSA() lookup to work. 282 */ 283 #define TCP_SIG_SPI 0x1000 284 #endif /* TCP_SIGNATURE */ 285 286 /* 287 * Structure to hold TCP options that are only used during segment 288 * processing (in tcp_input), but not held in the tcpcb. 289 * It's basically used to reduce the number of parameters 290 * to tcp_dooptions and tcp_addoptions. 291 * The binary order of the to_flags is relevant for packing of the 292 * options in tcp_addoptions. 293 */ 294 struct tcpopt { 295 u_int64_t to_flags; /* which options are present */ 296 #define TOF_MSS 0x0001 /* maximum segment size */ 297 #define TOF_SCALE 0x0002 /* window scaling */ 298 #define TOF_SACKPERM 0x0004 /* SACK permitted */ 299 #define TOF_TS 0x0010 /* timestamp */ 300 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ 301 #define TOF_SACK 0x0080 /* Peer sent SACK option */ 302 #define TOF_MAXOPT 0x0100 303 u_int32_t to_tsval; /* new timestamp */ 304 u_int32_t to_tsecr; /* reflected timestamp */ 305 u_char *to_sacks; /* pointer to the first SACK blocks */ 306 u_char *to_signature; /* pointer to the TCP-MD5 signature */ 307 u_int16_t to_mss; /* maximum segment size */ 308 u_int8_t to_wscale; /* window scaling */ 309 u_int8_t to_nsacks; /* number of SACK blocks */ 310 u_int32_t to_spare; /* UTO */ 311 }; 312 313 /* 314 * Flags for tcp_dooptions. 315 */ 316 #define TO_SYN 0x01 /* parse SYN-only options */ 317 318 struct hc_metrics_lite { /* must stay in sync with hc_metrics */ 319 u_long rmx_mtu; /* MTU for this path */ 320 u_long rmx_ssthresh; /* outbound gateway buffer limit */ 321 u_long rmx_rtt; /* estimated round trip time */ 322 u_long rmx_rttvar; /* estimated rtt variance */ 323 u_long rmx_bandwidth; /* estimated bandwidth */ 324 u_long rmx_cwnd; /* congestion window */ 325 u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 326 u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 327 }; 328 329 /* 330 * Used by tcp_maxmtu() to communicate interface specific features 331 * and limits at the time of connection setup. 332 */ 333 struct tcp_ifcap { 334 int ifcap; 335 u_int tsomax; 336 }; 337 338 #ifndef _NETINET_IN_PCB_H_ 339 struct in_conninfo; 340 #endif /* _NETINET_IN_PCB_H_ */ 341 342 struct tcptw { 343 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 344 tcp_seq snd_nxt; 345 tcp_seq rcv_nxt; 346 tcp_seq iss; 347 tcp_seq irs; 348 u_short last_win; /* cached window value */ 349 u_short tw_so_options; /* copy of so_options */ 350 struct ucred *tw_cred; /* user credentials */ 351 u_int32_t t_recent; 352 u_int32_t ts_offset; /* our timestamp offset */ 353 u_int t_starttime; 354 int tw_time; 355 TAILQ_ENTRY(tcptw) tw_2msl; 356 }; 357 358 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 359 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 360 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 361 362 /* 363 * The smoothed round-trip time and estimated variance 364 * are stored as fixed point numbers scaled by the values below. 365 * For convenience, these scales are also used in smoothing the average 366 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 367 * With these scales, srtt has 3 bits to the right of the binary point, 368 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 369 * binary point, and is smoothed with an ALPHA of 0.75. 370 */ 371 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 372 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 373 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 374 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 375 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 376 377 /* 378 * The initial retransmission should happen at rtt + 4 * rttvar. 379 * Because of the way we do the smoothing, srtt and rttvar 380 * will each average +1/2 tick of bias. When we compute 381 * the retransmit timer, we want 1/2 tick of rounding and 382 * 1 extra tick because of +-1/2 tick uncertainty in the 383 * firing of the timer. The bias will give us exactly the 384 * 1.5 tick we need. But, because the bias is 385 * statistical, we have to test that we don't drop below 386 * the minimum feasible timer (which is 2 ticks). 387 * This version of the macro adapted from a paper by Lawrence 388 * Brakmo and Larry Peterson which outlines a problem caused 389 * by insufficient precision in the original implementation, 390 * which results in inappropriately large RTO values for very 391 * fast networks. 392 */ 393 #define TCP_REXMTVAL(tp) \ 394 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 395 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 396 397 /* 398 * TCP statistics. 399 * Many of these should be kept per connection, 400 * but that's inconvenient at the moment. 401 */ 402 struct tcpstat { 403 uint64_t tcps_connattempt; /* connections initiated */ 404 uint64_t tcps_accepts; /* connections accepted */ 405 uint64_t tcps_connects; /* connections established */ 406 uint64_t tcps_drops; /* connections dropped */ 407 uint64_t tcps_conndrops; /* embryonic connections dropped */ 408 uint64_t tcps_minmssdrops; /* average minmss too low drops */ 409 uint64_t tcps_closed; /* conn. closed (includes drops) */ 410 uint64_t tcps_segstimed; /* segs where we tried to get rtt */ 411 uint64_t tcps_rttupdated; /* times we succeeded */ 412 uint64_t tcps_delack; /* delayed acks sent */ 413 uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 414 uint64_t tcps_rexmttimeo; /* retransmit timeouts */ 415 uint64_t tcps_persisttimeo; /* persist timeouts */ 416 uint64_t tcps_keeptimeo; /* keepalive timeouts */ 417 uint64_t tcps_keepprobe; /* keepalive probes sent */ 418 uint64_t tcps_keepdrops; /* connections dropped in keepalive */ 419 420 uint64_t tcps_sndtotal; /* total packets sent */ 421 uint64_t tcps_sndpack; /* data packets sent */ 422 uint64_t tcps_sndbyte; /* data bytes sent */ 423 uint64_t tcps_sndrexmitpack; /* data packets retransmitted */ 424 uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 425 uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 426 uint64_t tcps_sndacks; /* ack-only packets sent */ 427 uint64_t tcps_sndprobe; /* window probes sent */ 428 uint64_t tcps_sndurg; /* packets sent with URG only */ 429 uint64_t tcps_sndwinup; /* window update-only packets sent */ 430 uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 431 432 uint64_t tcps_rcvtotal; /* total packets received */ 433 uint64_t tcps_rcvpack; /* packets received in sequence */ 434 uint64_t tcps_rcvbyte; /* bytes received in sequence */ 435 uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */ 436 uint64_t tcps_rcvbadoff; /* packets received with bad offset */ 437 uint64_t tcps_rcvmemdrop; /* packets dropped for lack of memory */ 438 uint64_t tcps_rcvshort; /* packets received too short */ 439 uint64_t tcps_rcvduppack; /* duplicate-only packets received */ 440 uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 441 uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */ 442 uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 443 uint64_t tcps_rcvoopack; /* out-of-order packets received */ 444 uint64_t tcps_rcvoobyte; /* out-of-order bytes received */ 445 uint64_t tcps_rcvpackafterwin; /* packets with data after window */ 446 uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 447 uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */ 448 uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */ 449 uint64_t tcps_rcvdupack; /* rcvd duplicate acks */ 450 uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 451 uint64_t tcps_rcvackpack; /* rcvd ack packets */ 452 uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 453 uint64_t tcps_rcvwinupd; /* rcvd window update packets */ 454 uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */ 455 uint64_t tcps_predack; /* times hdr predict ok for acks */ 456 uint64_t tcps_preddat; /* times hdr predict ok for data pkts */ 457 uint64_t tcps_pcbcachemiss; 458 uint64_t tcps_cachedrtt; /* times cached RTT in route updated */ 459 uint64_t tcps_cachedrttvar; /* times cached rttvar updated */ 460 uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */ 461 uint64_t tcps_usedrtt; /* times RTT initialized from route */ 462 uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */ 463 uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/ 464 uint64_t tcps_persistdrop; /* timeout in persist state */ 465 uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 466 uint64_t tcps_mturesent; /* resends due to MTU discovery */ 467 uint64_t tcps_listendrop; /* listen queue overflows */ 468 uint64_t tcps_badrst; /* ignored RSTs in the window */ 469 470 uint64_t tcps_sc_added; /* entry added to syncache */ 471 uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */ 472 uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */ 473 uint64_t tcps_sc_dropped; /* could not reply to packet */ 474 uint64_t tcps_sc_completed; /* successful extraction of entry */ 475 uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */ 476 uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */ 477 uint64_t tcps_sc_reset; /* RST removed entry from syncache */ 478 uint64_t tcps_sc_stale; /* timed out or listen socket gone */ 479 uint64_t tcps_sc_aborted; /* syncache entry aborted */ 480 uint64_t tcps_sc_badack; /* removed due to bad ACK */ 481 uint64_t tcps_sc_unreach; /* ICMP unreachable received */ 482 uint64_t tcps_sc_zonefail; /* zalloc() failed */ 483 uint64_t tcps_sc_sendcookie; /* SYN cookie sent */ 484 uint64_t tcps_sc_recvcookie; /* SYN cookie received */ 485 486 uint64_t tcps_hc_added; /* entry added to hostcache */ 487 uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */ 488 489 uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ 490 491 /* SACK related stats */ 492 uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */ 493 uint64_t tcps_sack_rexmits; /* SACK rexmit segments */ 494 uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 495 uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 496 uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */ 497 uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */ 498 499 /* ECN related stats */ 500 uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */ 501 uint64_t tcps_ecn_ect0; /* ECN Capable Transport */ 502 uint64_t tcps_ecn_ect1; /* ECN Capable Transport */ 503 uint64_t tcps_ecn_shs; /* ECN successful handshakes */ 504 uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */ 505 506 /* TCP_SIGNATURE related stats */ 507 uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */ 508 uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */ 509 uint64_t tcps_sig_err_buildsig; /* Mismatching signature received */ 510 uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */ 511 uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */ 512 513 uint64_t _pad[12]; /* 6 UTO, 6 TBD */ 514 }; 515 516 #ifdef _KERNEL 517 518 #include <sys/counter.h> 519 520 /* Should match 'struct tcpstat' above. */ 521 struct tcpstat_p { 522 counter_u64_t tcps_connattempt; 523 counter_u64_t tcps_accepts; 524 counter_u64_t tcps_connects; 525 counter_u64_t tcps_drops; 526 counter_u64_t tcps_conndrops; 527 counter_u64_t tcps_minmssdrops; 528 counter_u64_t tcps_closed; 529 counter_u64_t tcps_segstimed; 530 counter_u64_t tcps_rttupdated; 531 counter_u64_t tcps_delack; 532 counter_u64_t tcps_timeoutdrop; 533 counter_u64_t tcps_rexmttimeo; 534 counter_u64_t tcps_persisttimeo; 535 counter_u64_t tcps_keeptimeo; 536 counter_u64_t tcps_keepprobe; 537 counter_u64_t tcps_keepdrops; 538 counter_u64_t tcps_sndtotal; 539 counter_u64_t tcps_sndpack; 540 counter_u64_t tcps_sndbyte; 541 counter_u64_t tcps_sndrexmitpack; 542 counter_u64_t tcps_sndrexmitbyte; 543 counter_u64_t tcps_sndrexmitbad; 544 counter_u64_t tcps_sndacks; 545 counter_u64_t tcps_sndprobe; 546 counter_u64_t tcps_sndurg; 547 counter_u64_t tcps_sndwinup; 548 counter_u64_t tcps_sndctrl; 549 counter_u64_t tcps_rcvtotal; 550 counter_u64_t tcps_rcvpack; 551 counter_u64_t tcps_rcvbyte; 552 counter_u64_t tcps_rcvbadsum; 553 counter_u64_t tcps_rcvbadoff; 554 counter_u64_t tcps_rcvmemdrop; 555 counter_u64_t tcps_rcvshort; 556 counter_u64_t tcps_rcvduppack; 557 counter_u64_t tcps_rcvdupbyte; 558 counter_u64_t tcps_rcvpartduppack; 559 counter_u64_t tcps_rcvpartdupbyte; 560 counter_u64_t tcps_rcvoopack; 561 counter_u64_t tcps_rcvoobyte; 562 counter_u64_t tcps_rcvpackafterwin; 563 counter_u64_t tcps_rcvbyteafterwin; 564 counter_u64_t tcps_rcvafterclose; 565 counter_u64_t tcps_rcvwinprobe; 566 counter_u64_t tcps_rcvdupack; 567 counter_u64_t tcps_rcvacktoomuch; 568 counter_u64_t tcps_rcvackpack; 569 counter_u64_t tcps_rcvackbyte; 570 counter_u64_t tcps_rcvwinupd; 571 counter_u64_t tcps_pawsdrop; 572 counter_u64_t tcps_predack; 573 counter_u64_t tcps_preddat; 574 counter_u64_t tcps_pcbcachemiss; 575 counter_u64_t tcps_cachedrtt; 576 counter_u64_t tcps_cachedrttvar; 577 counter_u64_t tcps_cachedssthresh; 578 counter_u64_t tcps_usedrtt; 579 counter_u64_t tcps_usedrttvar; 580 counter_u64_t tcps_usedssthresh; 581 counter_u64_t tcps_persistdrop; 582 counter_u64_t tcps_badsyn; 583 counter_u64_t tcps_mturesent; 584 counter_u64_t tcps_listendrop; 585 counter_u64_t tcps_badrst; 586 counter_u64_t tcps_sc_added; 587 counter_u64_t tcps_sc_retransmitted; 588 counter_u64_t tcps_sc_dupsyn; 589 counter_u64_t tcps_sc_dropped; 590 counter_u64_t tcps_sc_completed; 591 counter_u64_t tcps_sc_bucketoverflow; 592 counter_u64_t tcps_sc_cacheoverflow; 593 counter_u64_t tcps_sc_reset; 594 counter_u64_t tcps_sc_stale; 595 counter_u64_t tcps_sc_aborted; 596 counter_u64_t tcps_sc_badack; 597 counter_u64_t tcps_sc_unreach; 598 counter_u64_t tcps_sc_zonefail; 599 counter_u64_t tcps_sc_sendcookie; 600 counter_u64_t tcps_sc_recvcookie; 601 counter_u64_t tcps_hc_added; 602 counter_u64_t tcps_hc_bucketoverflow; 603 counter_u64_t tcps_finwait2_drops; 604 counter_u64_t tcps_sack_recovery_episode; 605 counter_u64_t tcps_sack_rexmits; 606 counter_u64_t tcps_sack_rexmit_bytes; 607 counter_u64_t tcps_sack_rcv_blocks; 608 counter_u64_t tcps_sack_send_blocks; 609 counter_u64_t tcps_sack_sboverflow; 610 counter_u64_t tcps_ecn_ce; 611 counter_u64_t tcps_ecn_ect0; 612 counter_u64_t tcps_ecn_ect1; 613 counter_u64_t tcps_ecn_shs; 614 counter_u64_t tcps_ecn_rcwnd; 615 counter_u64_t tcps_sig_rcvgoodsig; 616 counter_u64_t tcps_sig_rcvbadsig; 617 counter_u64_t tcps_sig_err_buildsig; 618 counter_u64_t tcps_sig_err_sigopt; 619 counter_u64_t tcps_sig_err_nosigopt; 620 }; 621 622 VNET_DECLARE(struct tcpstat_p, tcpstatp); /* tcp statistics */ 623 #define V_tcpstatp VNET(tcpstatp) 624 625 /* 626 * In-kernel consumers can use these accessor macros directly to update 627 * stats. 628 */ 629 #define TCPSTAT_ADD(name, val) counter_u64_add(V_tcpstatp.name, (val)) 630 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1) 631 632 /* 633 * Kernel module consumers must use this accessor macro. 634 */ 635 void kmod_tcpstat_inc(int statnum); 636 #define KMOD_TCPSTAT_INC(name) \ 637 kmod_tcpstat_inc(offsetof(struct tcpstat_p, name) / \ 638 sizeof(counter_u64_t)) 639 640 /* 641 * TCP specific helper hook point identifiers. 642 */ 643 #define HHOOK_TCP_EST_IN 0 644 #define HHOOK_TCP_EST_OUT 1 645 #define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT 646 647 struct tcp_hhook_data { 648 struct tcpcb *tp; 649 struct tcphdr *th; 650 struct tcpopt *to; 651 long len; 652 int tso; 653 tcp_seq curack; 654 }; 655 #endif 656 657 /* 658 * TCB structure exported to user-land via sysctl(3). 659 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 660 * included. Not all of our clients do. 661 */ 662 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 663 struct xtcp_timer { 664 int tt_rexmt; /* retransmit timer */ 665 int tt_persist; /* retransmit persistence */ 666 int tt_keep; /* keepalive */ 667 int tt_2msl; /* 2*msl TIME_WAIT timer */ 668 int tt_delack; /* delayed ACK timer */ 669 int t_rcvtime; /* Time since last packet received */ 670 }; 671 struct xtcpcb { 672 size_t xt_len; 673 struct inpcb xt_inp; 674 struct tcpcb xt_tp; 675 struct xsocket xt_socket; 676 struct xtcp_timer xt_timer; 677 u_quad_t xt_alignment_hack; 678 }; 679 #endif 680 681 /* 682 * Names for TCP sysctl objects 683 */ 684 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 685 #define TCPCTL_MSSDFLT 3 /* MSS default */ 686 #define TCPCTL_STATS 4 /* statistics (read-only) */ 687 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 688 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 689 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 690 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 691 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 692 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 693 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 694 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 695 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 696 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 697 #define TCPCTL_DROP 15 /* drop tcp connection */ 698 #define TCPCTL_MAXID 16 699 #define TCPCTL_FINWAIT2_TIMEOUT 17 700 701 #define TCPCTL_NAMES { \ 702 { 0, 0 }, \ 703 { "rfc1323", CTLTYPE_INT }, \ 704 { "mssdflt", CTLTYPE_INT }, \ 705 { "stats", CTLTYPE_STRUCT }, \ 706 { "rttdflt", CTLTYPE_INT }, \ 707 { "keepidle", CTLTYPE_INT }, \ 708 { "keepintvl", CTLTYPE_INT }, \ 709 { "sendspace", CTLTYPE_INT }, \ 710 { "recvspace", CTLTYPE_INT }, \ 711 { "keepinit", CTLTYPE_INT }, \ 712 { "pcblist", CTLTYPE_STRUCT }, \ 713 { "delacktime", CTLTYPE_INT }, \ 714 { "v6mssdflt", CTLTYPE_INT }, \ 715 { "maxid", CTLTYPE_INT }, \ 716 } 717 718 719 #ifdef _KERNEL 720 #ifdef SYSCTL_DECL 721 SYSCTL_DECL(_net_inet_tcp); 722 SYSCTL_DECL(_net_inet_tcp_sack); 723 MALLOC_DECLARE(M_TCPLOG); 724 #endif 725 726 VNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */ 727 VNET_DECLARE(struct inpcbinfo, tcbinfo); 728 extern int tcp_log_in_vain; 729 VNET_DECLARE(int, tcp_mssdflt); /* XXX */ 730 VNET_DECLARE(int, tcp_minmss); 731 VNET_DECLARE(int, tcp_delack_enabled); 732 VNET_DECLARE(int, tcp_do_rfc3390); 733 VNET_DECLARE(int, tcp_do_initcwnd10); 734 VNET_DECLARE(int, tcp_sendspace); 735 VNET_DECLARE(int, tcp_recvspace); 736 VNET_DECLARE(int, path_mtu_discovery); 737 VNET_DECLARE(int, tcp_do_rfc3465); 738 VNET_DECLARE(int, tcp_abc_l_var); 739 #define V_tcb VNET(tcb) 740 #define V_tcbinfo VNET(tcbinfo) 741 #define V_tcp_mssdflt VNET(tcp_mssdflt) 742 #define V_tcp_minmss VNET(tcp_minmss) 743 #define V_tcp_delack_enabled VNET(tcp_delack_enabled) 744 #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) 745 #define V_tcp_do_initcwnd10 VNET(tcp_do_initcwnd10) 746 #define V_tcp_sendspace VNET(tcp_sendspace) 747 #define V_tcp_recvspace VNET(tcp_recvspace) 748 #define V_path_mtu_discovery VNET(path_mtu_discovery) 749 #define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465) 750 #define V_tcp_abc_l_var VNET(tcp_abc_l_var) 751 752 VNET_DECLARE(int, tcp_do_sack); /* SACK enabled/disabled */ 753 VNET_DECLARE(int, tcp_sc_rst_sock_fail); /* RST on sock alloc failure */ 754 #define V_tcp_do_sack VNET(tcp_do_sack) 755 #define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail) 756 757 VNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */ 758 VNET_DECLARE(int, tcp_ecn_maxretries); 759 #define V_tcp_do_ecn VNET(tcp_do_ecn) 760 #define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries) 761 762 VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]); 763 #define V_tcp_hhh VNET(tcp_hhh) 764 765 int tcp_addoptions(struct tcpopt *, u_char *); 766 int tcp_ccalgounload(struct cc_algo *unload_algo); 767 struct tcpcb * 768 tcp_close(struct tcpcb *); 769 void tcp_discardcb(struct tcpcb *); 770 void tcp_twstart(struct tcpcb *); 771 #if 0 772 int tcp_twrecycleable(struct tcptw *tw); 773 #endif 774 void tcp_twclose(struct tcptw *_tw, int _reuse); 775 void tcp_ctlinput(int, struct sockaddr *, void *); 776 int tcp_ctloutput(struct socket *, struct sockopt *); 777 struct tcpcb * 778 tcp_drop(struct tcpcb *, int); 779 void tcp_drain(void); 780 void tcp_init(void); 781 #ifdef VIMAGE 782 void tcp_destroy(void); 783 #endif 784 void tcp_fini(void *); 785 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *, 786 const void *); 787 char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *, 788 const void *); 789 int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *); 790 void tcp_reass_init(void); 791 void tcp_reass_flush(struct tcpcb *); 792 #ifdef VIMAGE 793 void tcp_reass_destroy(void); 794 #endif 795 void tcp_input(struct mbuf *, int); 796 u_long tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *); 797 u_long tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *); 798 void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *, 799 struct tcp_ifcap *); 800 void tcp_mss(struct tcpcb *, int); 801 int tcp_mssopt(struct in_conninfo *); 802 struct inpcb * 803 tcp_drop_syn_sent(struct inpcb *, int); 804 struct inpcb * 805 tcp_mtudisc(struct inpcb *, int); 806 struct tcpcb * 807 tcp_newtcpcb(struct inpcb *); 808 int tcp_output(struct tcpcb *); 809 void tcp_respond(struct tcpcb *, void *, 810 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 811 void tcp_tw_init(void); 812 #ifdef VIMAGE 813 void tcp_tw_destroy(void); 814 #endif 815 void tcp_tw_zone_change(void); 816 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *, 817 struct mbuf *, int); 818 int tcp_twrespond(struct tcptw *, int); 819 void tcp_setpersist(struct tcpcb *); 820 #ifdef TCP_SIGNATURE 821 int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int); 822 int tcp_signature_verify(struct mbuf *, int, int, int, struct tcpopt *, 823 struct tcphdr *, u_int); 824 #endif 825 void tcp_slowtimo(void); 826 struct tcptemp * 827 tcpip_maketemplate(struct inpcb *); 828 void tcpip_fillheaders(struct inpcb *, void *, void *); 829 void tcp_timer_activate(struct tcpcb *, int, u_int); 830 int tcp_timer_active(struct tcpcb *, int); 831 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); 832 /* 833 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 834 */ 835 void tcp_hc_init(void); 836 #ifdef VIMAGE 837 void tcp_hc_destroy(void); 838 #endif 839 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 840 u_long tcp_hc_getmtu(struct in_conninfo *); 841 void tcp_hc_updatemtu(struct in_conninfo *, u_long); 842 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 843 844 extern struct pr_usrreqs tcp_usrreqs; 845 tcp_seq tcp_new_isn(struct tcpcb *); 846 847 void tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq); 848 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); 849 void tcp_clean_sackreport(struct tcpcb *tp); 850 void tcp_sack_adjust(struct tcpcb *tp); 851 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 852 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 853 void tcp_free_sackholes(struct tcpcb *tp); 854 int tcp_newreno(struct tcpcb *, struct tcphdr *); 855 u_long tcp_seq_subtract(u_long, u_long ); 856 857 void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type); 858 859 #endif /* _KERNEL */ 860 861 #endif /* _NETINET_TCP_VAR_H_ */ 862