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 74 int ispare; /* explicit pad for 64bit alignment */ 75 uint64_t _pad[2]; /* 1 sacked_bytes, 1 TBD */ 76 }; 77 78 struct tcptemp { 79 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 80 struct tcphdr tt_t; 81 }; 82 83 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 84 85 /* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */ 86 #ifdef INET6 87 #define ND6_HINT(tp) \ 88 do { \ 89 if ((tp) && (tp)->t_inpcb && \ 90 ((tp)->t_inpcb->inp_vflag & INP_IPV6) != 0) \ 91 nd6_nud_hint(NULL, NULL, 0); \ 92 } while (0) 93 #else 94 #define ND6_HINT(tp) 95 #endif 96 97 /* 98 * Tcp control block, one per tcp; fields: 99 * Organized for 16 byte cacheline efficiency. 100 */ 101 struct tcpcb { 102 struct tsegqe_head t_segq; /* segment reassembly queue */ 103 void *t_pspare[2]; /* new reassembly queue */ 104 int t_segqlen; /* segment reassembly queue length */ 105 int t_dupacks; /* consecutive dup acks recd */ 106 107 struct tcp_timer *t_timers; /* All the TCP timers in one struct */ 108 109 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 110 int t_state; /* state of this connection */ 111 u_int t_flags; 112 113 struct vnet *t_vnet; /* back pointer to parent vnet */ 114 115 tcp_seq snd_una; /* send unacknowledged */ 116 tcp_seq snd_max; /* highest sequence number sent; 117 * used to recognize retransmits 118 */ 119 tcp_seq snd_nxt; /* send next */ 120 tcp_seq snd_up; /* send urgent pointer */ 121 122 tcp_seq snd_wl1; /* window update seg seq number */ 123 tcp_seq snd_wl2; /* window update seg ack number */ 124 tcp_seq iss; /* initial send sequence number */ 125 tcp_seq irs; /* initial receive sequence number */ 126 127 tcp_seq rcv_nxt; /* receive next */ 128 tcp_seq rcv_adv; /* advertised window */ 129 u_long rcv_wnd; /* receive window */ 130 tcp_seq rcv_up; /* receive urgent pointer */ 131 132 u_long snd_wnd; /* send window */ 133 u_long snd_cwnd; /* congestion-controlled window */ 134 u_long snd_spare1; /* unused */ 135 u_long snd_ssthresh; /* snd_cwnd size threshold for 136 * for slow start exponential to 137 * linear switch 138 */ 139 u_long snd_spare2; /* unused */ 140 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 141 142 u_int t_maxopd; /* mss plus options */ 143 144 u_int t_rcvtime; /* inactivity time */ 145 u_int t_starttime; /* time connection was established */ 146 u_int t_rtttime; /* RTT measurement start time */ 147 tcp_seq t_rtseq; /* sequence number being timed */ 148 149 u_int t_bw_spare1; /* unused */ 150 tcp_seq t_bw_spare2; /* unused */ 151 152 int t_rxtcur; /* current retransmit value (ticks) */ 153 u_int t_maxseg; /* maximum segment size */ 154 int t_srtt; /* smoothed round-trip time */ 155 int t_rttvar; /* variance in round-trip time */ 156 157 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 158 u_int t_rttmin; /* minimum rtt allowed */ 159 u_int t_rttbest; /* best rtt we've seen */ 160 u_long t_rttupdated; /* number of times rtt sampled */ 161 u_long max_sndwnd; /* largest window peer has offered */ 162 163 int t_softerror; /* possible error not yet reported */ 164 /* out-of-band data */ 165 char t_oobflags; /* have some */ 166 char t_iobc; /* input character */ 167 /* RFC 1323 variables */ 168 u_char snd_scale; /* window scaling for send window */ 169 u_char rcv_scale; /* window scaling for recv window */ 170 u_char request_r_scale; /* pending window scaling */ 171 u_int32_t ts_recent; /* timestamp echo data */ 172 u_int ts_recent_age; /* when last updated */ 173 u_int32_t ts_offset; /* our timestamp offset */ 174 175 tcp_seq last_ack_sent; 176 /* experimental */ 177 u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 178 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 179 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 180 u_int t_badrxtwin; /* window for retransmit recovery */ 181 u_char snd_limited; /* segments limited transmitted */ 182 /* SACK related state */ 183 int snd_numholes; /* number of holes seen by sender */ 184 TAILQ_HEAD(sackhole_head, sackhole) snd_holes; 185 /* SACK scoreboard (sorted) */ 186 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ 187 int rcv_numsacks; /* # distinct sack blks present */ 188 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 189 tcp_seq sack_newdata; /* New data xmitted in this recovery 190 episode starts at this seq number */ 191 struct sackhint sackhint; /* SACK scoreboard hint */ 192 int t_rttlow; /* smallest observerved RTT */ 193 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ 194 int rfbuf_cnt; /* recv buffer autoscaling byte count */ 195 struct toe_usrreqs *t_tu; /* offload operations vector */ 196 void *t_toe; /* TOE pcb pointer */ 197 int t_bytes_acked; /* # bytes acked during current RTT */ 198 199 int t_ispare; /* explicit pad for 64bit alignment */ 200 void *t_pspare2[6]; /* 2 CC / 4 TBD */ 201 uint64_t _pad[12]; /* 7 UTO, 5 TBD (1-2 CC/RTT?) */ 202 }; 203 204 /* 205 * Flags and utility macros for the t_flags field. 206 */ 207 #define TF_ACKNOW 0x000001 /* ack peer immediately */ 208 #define TF_DELACK 0x000002 /* ack, but try to delay it */ 209 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 210 #define TF_NOOPT 0x000008 /* don't use tcp options */ 211 #define TF_SENTFIN 0x000010 /* have sent FIN */ 212 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 213 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 214 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 215 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 216 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 217 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 218 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 219 #define TF_NOPUSH 0x001000 /* don't push */ 220 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 221 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 222 #define TF_LASTIDLE 0x040000 /* connection was previously idle */ 223 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 224 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 225 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 226 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 227 #define TF_FORCEDATA 0x800000 /* force out a byte */ 228 #define TF_TSO 0x1000000 /* TSO enabled on this connection */ 229 #define TF_TOE 0x2000000 /* this connection is offloaded */ 230 #define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */ 231 #define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */ 232 #define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */ 233 234 #define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY) 235 #define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY 236 #define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY 237 238 /* 239 * Flags for the t_oobflags field. 240 */ 241 #define TCPOOB_HAVEDATA 0x01 242 #define TCPOOB_HADDATA 0x02 243 244 #ifdef TCP_SIGNATURE 245 /* 246 * Defines which are needed by the xform_tcp module and tcp_[in|out]put 247 * for SADB verification and lookup. 248 */ 249 #define TCP_SIGLEN 16 /* length of computed digest in bytes */ 250 #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */ 251 #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */ 252 /* 253 * Only a single SA per host may be specified at this time. An SPI is 254 * needed in order for the KEY_ALLOCSA() lookup to work. 255 */ 256 #define TCP_SIG_SPI 0x1000 257 #endif /* TCP_SIGNATURE */ 258 259 /* 260 * Structure to hold TCP options that are only used during segment 261 * processing (in tcp_input), but not held in the tcpcb. 262 * It's basically used to reduce the number of parameters 263 * to tcp_dooptions and tcp_addoptions. 264 * The binary order of the to_flags is relevant for packing of the 265 * options in tcp_addoptions. 266 */ 267 struct tcpopt { 268 u_int64_t to_flags; /* which options are present */ 269 #define TOF_MSS 0x0001 /* maximum segment size */ 270 #define TOF_SCALE 0x0002 /* window scaling */ 271 #define TOF_SACKPERM 0x0004 /* SACK permitted */ 272 #define TOF_TS 0x0010 /* timestamp */ 273 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ 274 #define TOF_SACK 0x0080 /* Peer sent SACK option */ 275 #define TOF_MAXOPT 0x0100 276 u_int32_t to_tsval; /* new timestamp */ 277 u_int32_t to_tsecr; /* reflected timestamp */ 278 u_char *to_sacks; /* pointer to the first SACK blocks */ 279 u_char *to_signature; /* pointer to the TCP-MD5 signature */ 280 u_int16_t to_mss; /* maximum segment size */ 281 u_int8_t to_wscale; /* window scaling */ 282 u_int8_t to_nsacks; /* number of SACK blocks */ 283 }; 284 285 /* 286 * Flags for tcp_dooptions. 287 */ 288 #define TO_SYN 0x01 /* parse SYN-only options */ 289 290 struct hc_metrics_lite { /* must stay in sync with hc_metrics */ 291 u_long rmx_mtu; /* MTU for this path */ 292 u_long rmx_ssthresh; /* outbound gateway buffer limit */ 293 u_long rmx_rtt; /* estimated round trip time */ 294 u_long rmx_rttvar; /* estimated rtt variance */ 295 u_long rmx_bandwidth; /* estimated bandwidth */ 296 u_long rmx_cwnd; /* congestion window */ 297 u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 298 u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 299 }; 300 301 #ifndef _NETINET_IN_PCB_H_ 302 struct in_conninfo; 303 #endif /* _NETINET_IN_PCB_H_ */ 304 305 struct tcptw { 306 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 307 tcp_seq snd_nxt; 308 tcp_seq rcv_nxt; 309 tcp_seq iss; 310 tcp_seq irs; 311 u_short last_win; /* cached window value */ 312 u_short tw_so_options; /* copy of so_options */ 313 struct ucred *tw_cred; /* user credentials */ 314 u_int32_t t_recent; 315 u_int32_t ts_offset; /* our timestamp offset */ 316 u_int t_starttime; 317 int tw_time; 318 TAILQ_ENTRY(tcptw) tw_2msl; 319 }; 320 321 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 322 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 323 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 324 325 /* 326 * The smoothed round-trip time and estimated variance 327 * are stored as fixed point numbers scaled by the values below. 328 * For convenience, these scales are also used in smoothing the average 329 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 330 * With these scales, srtt has 3 bits to the right of the binary point, 331 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 332 * binary point, and is smoothed with an ALPHA of 0.75. 333 */ 334 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 335 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 336 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 337 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 338 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 339 340 /* 341 * The initial retransmission should happen at rtt + 4 * rttvar. 342 * Because of the way we do the smoothing, srtt and rttvar 343 * will each average +1/2 tick of bias. When we compute 344 * the retransmit timer, we want 1/2 tick of rounding and 345 * 1 extra tick because of +-1/2 tick uncertainty in the 346 * firing of the timer. The bias will give us exactly the 347 * 1.5 tick we need. But, because the bias is 348 * statistical, we have to test that we don't drop below 349 * the minimum feasible timer (which is 2 ticks). 350 * This version of the macro adapted from a paper by Lawrence 351 * Brakmo and Larry Peterson which outlines a problem caused 352 * by insufficient precision in the original implementation, 353 * which results in inappropriately large RTO values for very 354 * fast networks. 355 */ 356 #define TCP_REXMTVAL(tp) \ 357 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 358 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 359 360 /* 361 * TCP statistics. 362 * Many of these should be kept per connection, 363 * but that's inconvenient at the moment. 364 */ 365 struct tcpstat { 366 u_long tcps_connattempt; /* connections initiated */ 367 u_long tcps_accepts; /* connections accepted */ 368 u_long tcps_connects; /* connections established */ 369 u_long tcps_drops; /* connections dropped */ 370 u_long tcps_conndrops; /* embryonic connections dropped */ 371 u_long tcps_minmssdrops; /* average minmss too low drops */ 372 u_long tcps_closed; /* conn. closed (includes drops) */ 373 u_long tcps_segstimed; /* segs where we tried to get rtt */ 374 u_long tcps_rttupdated; /* times we succeeded */ 375 u_long tcps_delack; /* delayed acks sent */ 376 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 377 u_long tcps_rexmttimeo; /* retransmit timeouts */ 378 u_long tcps_persisttimeo; /* persist timeouts */ 379 u_long tcps_keeptimeo; /* keepalive timeouts */ 380 u_long tcps_keepprobe; /* keepalive probes sent */ 381 u_long tcps_keepdrops; /* connections dropped in keepalive */ 382 383 u_long tcps_sndtotal; /* total packets sent */ 384 u_long tcps_sndpack; /* data packets sent */ 385 u_long tcps_sndbyte; /* data bytes sent */ 386 u_long tcps_sndrexmitpack; /* data packets retransmitted */ 387 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 388 u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 389 u_long tcps_sndacks; /* ack-only packets sent */ 390 u_long tcps_sndprobe; /* window probes sent */ 391 u_long tcps_sndurg; /* packets sent with URG only */ 392 u_long tcps_sndwinup; /* window update-only packets sent */ 393 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 394 395 u_long tcps_rcvtotal; /* total packets received */ 396 u_long tcps_rcvpack; /* packets received in sequence */ 397 u_long tcps_rcvbyte; /* bytes received in sequence */ 398 u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 399 u_long tcps_rcvbadoff; /* packets received with bad offset */ 400 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 401 u_long tcps_rcvshort; /* packets received too short */ 402 u_long tcps_rcvduppack; /* duplicate-only packets received */ 403 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 404 u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 405 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 406 u_long tcps_rcvoopack; /* out-of-order packets received */ 407 u_long tcps_rcvoobyte; /* out-of-order bytes received */ 408 u_long tcps_rcvpackafterwin; /* packets with data after window */ 409 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 410 u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 411 u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 412 u_long tcps_rcvdupack; /* rcvd duplicate acks */ 413 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 414 u_long tcps_rcvackpack; /* rcvd ack packets */ 415 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 416 u_long tcps_rcvwinupd; /* rcvd window update packets */ 417 u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 418 u_long tcps_predack; /* times hdr predict ok for acks */ 419 u_long tcps_preddat; /* times hdr predict ok for data pkts */ 420 u_long tcps_pcbcachemiss; 421 u_long tcps_cachedrtt; /* times cached RTT in route updated */ 422 u_long tcps_cachedrttvar; /* times cached rttvar updated */ 423 u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 424 u_long tcps_usedrtt; /* times RTT initialized from route */ 425 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 426 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 427 u_long tcps_persistdrop; /* timeout in persist state */ 428 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 429 u_long tcps_mturesent; /* resends due to MTU discovery */ 430 u_long tcps_listendrop; /* listen queue overflows */ 431 u_long tcps_badrst; /* ignored RSTs in the window */ 432 433 u_long tcps_sc_added; /* entry added to syncache */ 434 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 435 u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 436 u_long tcps_sc_dropped; /* could not reply to packet */ 437 u_long tcps_sc_completed; /* successful extraction of entry */ 438 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 439 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 440 u_long tcps_sc_reset; /* RST removed entry from syncache */ 441 u_long tcps_sc_stale; /* timed out or listen socket gone */ 442 u_long tcps_sc_aborted; /* syncache entry aborted */ 443 u_long tcps_sc_badack; /* removed due to bad ACK */ 444 u_long tcps_sc_unreach; /* ICMP unreachable received */ 445 u_long tcps_sc_zonefail; /* zalloc() failed */ 446 u_long tcps_sc_sendcookie; /* SYN cookie sent */ 447 u_long tcps_sc_recvcookie; /* SYN cookie received */ 448 449 u_long tcps_hc_added; /* entry added to hostcache */ 450 u_long tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */ 451 452 u_long tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ 453 454 /* SACK related stats */ 455 u_long tcps_sack_recovery_episode; /* SACK recovery episodes */ 456 u_long tcps_sack_rexmits; /* SACK rexmit segments */ 457 u_long tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 458 u_long tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 459 u_long tcps_sack_send_blocks; /* SACK blocks (options) sent */ 460 u_long tcps_sack_sboverflow; /* times scoreboard overflowed */ 461 462 /* ECN related stats */ 463 u_long tcps_ecn_ce; /* ECN Congestion Experienced */ 464 u_long tcps_ecn_ect0; /* ECN Capable Transport */ 465 u_long tcps_ecn_ect1; /* ECN Capable Transport */ 466 u_long tcps_ecn_shs; /* ECN successful handshakes */ 467 u_long tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */ 468 469 u_long _pad[12]; /* 6 UTO, 6 TBD */ 470 }; 471 472 #ifdef _KERNEL 473 /* 474 * In-kernel consumers can use these accessor macros directly to update 475 * stats. 476 */ 477 #define TCPSTAT_ADD(name, val) V_tcpstat.name += (val) 478 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1) 479 480 /* 481 * Kernel module consumers must use this accessor macro. 482 */ 483 void kmod_tcpstat_inc(int statnum); 484 #define KMOD_TCPSTAT_INC(name) \ 485 kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(u_long)) 486 #endif 487 488 /* 489 * TCB structure exported to user-land via sysctl(3). 490 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 491 * included. Not all of our clients do. 492 */ 493 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 494 struct xtcp_timer { 495 int tt_rexmt; /* retransmit timer */ 496 int tt_persist; /* retransmit persistence */ 497 int tt_keep; /* keepalive */ 498 int tt_2msl; /* 2*msl TIME_WAIT timer */ 499 int tt_delack; /* delayed ACK timer */ 500 int t_rcvtime; /* Time since last packet received */ 501 }; 502 struct xtcpcb { 503 size_t xt_len; 504 struct inpcb xt_inp; 505 struct tcpcb xt_tp; 506 struct xsocket xt_socket; 507 struct xtcp_timer xt_timer; 508 u_quad_t xt_alignment_hack; 509 }; 510 #endif 511 512 /* 513 * Names for TCP sysctl objects 514 */ 515 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 516 #define TCPCTL_MSSDFLT 3 /* MSS default */ 517 #define TCPCTL_STATS 4 /* statistics (read-only) */ 518 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 519 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 520 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 521 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 522 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 523 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 524 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 525 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 526 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 527 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 528 #define TCPCTL_DROP 15 /* drop tcp connection */ 529 #define TCPCTL_MAXID 16 530 #define TCPCTL_FINWAIT2_TIMEOUT 17 531 532 #define TCPCTL_NAMES { \ 533 { 0, 0 }, \ 534 { "rfc1323", CTLTYPE_INT }, \ 535 { "mssdflt", CTLTYPE_INT }, \ 536 { "stats", CTLTYPE_STRUCT }, \ 537 { "rttdflt", CTLTYPE_INT }, \ 538 { "keepidle", CTLTYPE_INT }, \ 539 { "keepintvl", CTLTYPE_INT }, \ 540 { "sendspace", CTLTYPE_INT }, \ 541 { "recvspace", CTLTYPE_INT }, \ 542 { "keepinit", CTLTYPE_INT }, \ 543 { "pcblist", CTLTYPE_STRUCT }, \ 544 { "delacktime", CTLTYPE_INT }, \ 545 { "v6mssdflt", CTLTYPE_INT }, \ 546 { "maxid", CTLTYPE_INT }, \ 547 } 548 549 550 #ifdef _KERNEL 551 #ifdef SYSCTL_DECL 552 SYSCTL_DECL(_net_inet_tcp); 553 SYSCTL_DECL(_net_inet_tcp_sack); 554 MALLOC_DECLARE(M_TCPLOG); 555 #endif 556 557 VNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */ 558 VNET_DECLARE(struct inpcbinfo, tcbinfo); 559 VNET_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */ 560 extern int tcp_log_in_vain; 561 VNET_DECLARE(int, tcp_mssdflt); /* XXX */ 562 VNET_DECLARE(int, tcp_minmss); 563 VNET_DECLARE(int, tcp_delack_enabled); 564 VNET_DECLARE(int, tcp_do_rfc3390); 565 VNET_DECLARE(int, tcp_do_newreno); 566 VNET_DECLARE(int, path_mtu_discovery); 567 VNET_DECLARE(int, ss_fltsz); 568 VNET_DECLARE(int, ss_fltsz_local); 569 #define V_tcb VNET(tcb) 570 #define V_tcbinfo VNET(tcbinfo) 571 #define V_tcpstat VNET(tcpstat) 572 #define V_tcp_mssdflt VNET(tcp_mssdflt) 573 #define V_tcp_minmss VNET(tcp_minmss) 574 #define V_tcp_delack_enabled VNET(tcp_delack_enabled) 575 #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) 576 #define V_tcp_do_newreno VNET(tcp_do_newreno) 577 #define V_path_mtu_discovery VNET(path_mtu_discovery) 578 #define V_ss_fltsz VNET(ss_fltsz) 579 #define V_ss_fltsz_local VNET(ss_fltsz_local) 580 581 VNET_DECLARE(int, tcp_do_sack); /* SACK enabled/disabled */ 582 VNET_DECLARE(int, tcp_sc_rst_sock_fail); /* RST on sock alloc failure */ 583 #define V_tcp_do_sack VNET(tcp_do_sack) 584 #define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail) 585 586 VNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */ 587 VNET_DECLARE(int, tcp_ecn_maxretries); 588 #define V_tcp_do_ecn VNET(tcp_do_ecn) 589 #define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries) 590 591 int tcp_addoptions(struct tcpopt *, u_char *); 592 struct tcpcb * 593 tcp_close(struct tcpcb *); 594 void tcp_discardcb(struct tcpcb *); 595 void tcp_twstart(struct tcpcb *); 596 #if 0 597 int tcp_twrecycleable(struct tcptw *tw); 598 #endif 599 void tcp_twclose(struct tcptw *_tw, int _reuse); 600 void tcp_ctlinput(int, struct sockaddr *, void *); 601 int tcp_ctloutput(struct socket *, struct sockopt *); 602 struct tcpcb * 603 tcp_drop(struct tcpcb *, int); 604 void tcp_drain(void); 605 void tcp_init(void); 606 #ifdef VIMAGE 607 void tcp_destroy(void); 608 #endif 609 void tcp_fini(void *); 610 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *, 611 const void *); 612 char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *, 613 const void *); 614 int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *); 615 void tcp_reass_init(void); 616 void tcp_reass_flush(struct tcpcb *); 617 #ifdef VIMAGE 618 void tcp_reass_destroy(void); 619 #endif 620 void tcp_input(struct mbuf *, int); 621 u_long tcp_maxmtu(struct in_conninfo *, int *); 622 u_long tcp_maxmtu6(struct in_conninfo *, int *); 623 void tcp_mss_update(struct tcpcb *, int, struct hc_metrics_lite *, int *); 624 void tcp_mss(struct tcpcb *, int); 625 int tcp_mssopt(struct in_conninfo *); 626 struct inpcb * 627 tcp_drop_syn_sent(struct inpcb *, int); 628 struct inpcb * 629 tcp_mtudisc(struct inpcb *, int); 630 struct tcpcb * 631 tcp_newtcpcb(struct inpcb *); 632 int tcp_output(struct tcpcb *); 633 void tcp_respond(struct tcpcb *, void *, 634 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 635 void tcp_tw_init(void); 636 #ifdef VIMAGE 637 void tcp_tw_destroy(void); 638 #endif 639 void tcp_tw_zone_change(void); 640 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *, 641 struct mbuf *, int); 642 int tcp_twrespond(struct tcptw *, int); 643 void tcp_setpersist(struct tcpcb *); 644 #ifdef TCP_SIGNATURE 645 int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int); 646 #endif 647 void tcp_slowtimo(void); 648 struct tcptemp * 649 tcpip_maketemplate(struct inpcb *); 650 void tcpip_fillheaders(struct inpcb *, void *, void *); 651 void tcp_timer_activate(struct tcpcb *, int, u_int); 652 int tcp_timer_active(struct tcpcb *, int); 653 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); 654 /* 655 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 656 */ 657 void tcp_hc_init(void); 658 #ifdef VIMAGE 659 void tcp_hc_destroy(void); 660 #endif 661 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 662 u_long tcp_hc_getmtu(struct in_conninfo *); 663 void tcp_hc_updatemtu(struct in_conninfo *, u_long); 664 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 665 666 extern struct pr_usrreqs tcp_usrreqs; 667 extern u_long tcp_sendspace; 668 extern u_long tcp_recvspace; 669 tcp_seq tcp_new_isn(struct tcpcb *); 670 671 void tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq); 672 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); 673 void tcp_clean_sackreport(struct tcpcb *tp); 674 void tcp_sack_adjust(struct tcpcb *tp); 675 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 676 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 677 void tcp_free_sackholes(struct tcpcb *tp); 678 int tcp_newreno(struct tcpcb *, struct tcphdr *); 679 u_long tcp_seq_subtract(u_long, u_long ); 680 681 #endif /* _KERNEL */ 682 683 #endif /* _NETINET_TCP_VAR_H_ */ 684