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 VNET_DECLARE(int, tcp_reass_qsize); 48 VNET_DECLARE(struct uma_zone *, tcp_reass_zone); 49 #define V_tcp_reass_qsize VNET(tcp_reass_qsize) 50 #define V_tcp_reass_zone VNET(tcp_reass_zone) 51 #endif /* _KERNEL */ 52 53 /* TCP segment queue entry */ 54 struct tseg_qent { 55 LIST_ENTRY(tseg_qent) tqe_q; 56 int tqe_len; /* TCP segment data length */ 57 struct tcphdr *tqe_th; /* a pointer to tcp header */ 58 struct mbuf *tqe_m; /* mbuf contains packet */ 59 }; 60 LIST_HEAD(tsegqe_head, tseg_qent); 61 62 struct sackblk { 63 tcp_seq start; /* start seq no. of sack block */ 64 tcp_seq end; /* end seq no. */ 65 }; 66 67 struct sackhole { 68 tcp_seq start; /* start seq no. of hole */ 69 tcp_seq end; /* end seq no. */ 70 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ 71 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */ 72 }; 73 74 struct sackhint { 75 struct sackhole *nexthole; 76 int sack_bytes_rexmit; 77 78 int ispare; /* explicit pad for 64bit alignment */ 79 uint64_t _pad[2]; /* 1 sacked_bytes, 1 TBD */ 80 }; 81 82 struct tcptemp { 83 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 84 struct tcphdr tt_t; 85 }; 86 87 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 88 89 /* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */ 90 #ifdef INET6 91 #define ND6_HINT(tp) \ 92 do { \ 93 if ((tp) && (tp)->t_inpcb && \ 94 ((tp)->t_inpcb->inp_vflag & INP_IPV6) != 0) \ 95 nd6_nud_hint(NULL, NULL, 0); \ 96 } while (0) 97 #else 98 #define ND6_HINT(tp) 99 #endif 100 101 /* 102 * Tcp control block, one per tcp; fields: 103 * Organized for 16 byte cacheline efficiency. 104 */ 105 struct tcpcb { 106 struct tsegqe_head t_segq; /* segment reassembly queue */ 107 void *t_pspare[2]; /* new reassembly queue */ 108 int t_segqlen; /* segment reassembly queue length */ 109 int t_dupacks; /* consecutive dup acks recd */ 110 111 struct tcp_timer *t_timers; /* All the TCP timers in one struct */ 112 113 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 114 int t_state; /* state of this connection */ 115 u_int t_flags; 116 117 struct vnet *t_vnet; /* back pointer to parent vnet */ 118 119 tcp_seq snd_una; /* send unacknowledged */ 120 tcp_seq snd_max; /* highest sequence number sent; 121 * used to recognize retransmits 122 */ 123 tcp_seq snd_nxt; /* send next */ 124 tcp_seq snd_up; /* send urgent pointer */ 125 126 tcp_seq snd_wl1; /* window update seg seq number */ 127 tcp_seq snd_wl2; /* window update seg ack number */ 128 tcp_seq iss; /* initial send sequence number */ 129 tcp_seq irs; /* initial receive sequence number */ 130 131 tcp_seq rcv_nxt; /* receive next */ 132 tcp_seq rcv_adv; /* advertised window */ 133 u_long rcv_wnd; /* receive window */ 134 tcp_seq rcv_up; /* receive urgent pointer */ 135 136 u_long snd_wnd; /* send window */ 137 u_long snd_cwnd; /* congestion-controlled window */ 138 u_long snd_bwnd; /* bandwidth-controlled window */ 139 u_long snd_ssthresh; /* snd_cwnd size threshold for 140 * for slow start exponential to 141 * linear switch 142 */ 143 u_long snd_bandwidth; /* calculated bandwidth or 0 */ 144 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 145 146 u_int t_maxopd; /* mss plus options */ 147 148 u_int t_rcvtime; /* inactivity time */ 149 u_int t_starttime; /* time connection was established */ 150 u_int t_rtttime; /* RTT measurement start time */ 151 tcp_seq t_rtseq; /* sequence number being timed */ 152 153 u_int t_bw_rtttime; /* used for bandwidth calculation */ 154 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ 155 156 int t_rxtcur; /* current retransmit value (ticks) */ 157 u_int t_maxseg; /* maximum segment size */ 158 int t_srtt; /* smoothed round-trip time */ 159 int t_rttvar; /* variance in round-trip time */ 160 161 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 162 u_int t_rttmin; /* minimum rtt allowed */ 163 u_int t_rttbest; /* best rtt we've seen */ 164 u_long t_rttupdated; /* number of times rtt sampled */ 165 u_long max_sndwnd; /* largest window peer has offered */ 166 167 int t_softerror; /* possible error not yet reported */ 168 /* out-of-band data */ 169 char t_oobflags; /* have some */ 170 char t_iobc; /* input character */ 171 /* RFC 1323 variables */ 172 u_char snd_scale; /* window scaling for send window */ 173 u_char rcv_scale; /* window scaling for recv window */ 174 u_char request_r_scale; /* pending window scaling */ 175 u_int32_t ts_recent; /* timestamp echo data */ 176 u_int ts_recent_age; /* when last updated */ 177 u_int32_t ts_offset; /* our timestamp offset */ 178 179 tcp_seq last_ack_sent; 180 /* experimental */ 181 u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 182 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 183 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 184 u_int t_badrxtwin; /* window for retransmit recovery */ 185 u_char snd_limited; /* segments limited transmitted */ 186 /* SACK related state */ 187 int snd_numholes; /* number of holes seen by sender */ 188 TAILQ_HEAD(sackhole_head, sackhole) snd_holes; 189 /* SACK scoreboard (sorted) */ 190 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ 191 int rcv_numsacks; /* # distinct sack blks present */ 192 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 193 tcp_seq sack_newdata; /* New data xmitted in this recovery 194 episode starts at this seq number */ 195 struct sackhint sackhint; /* SACK scoreboard hint */ 196 int t_rttlow; /* smallest observerved RTT */ 197 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ 198 int rfbuf_cnt; /* recv buffer autoscaling byte count */ 199 struct toe_usrreqs *t_tu; /* offload operations vector */ 200 void *t_toe; /* TOE pcb pointer */ 201 int t_bytes_acked; /* # bytes acked during current RTT */ 202 203 int t_ispare; /* explicit pad for 64bit alignment */ 204 void *t_pspare2[6]; /* 2 CC / 4 TBD */ 205 uint64_t _pad[12]; /* 7 UTO, 5 TBD (1-2 CC/RTT?) */ 206 }; 207 208 /* 209 * Flags and utility macros for the t_flags field. 210 */ 211 #define TF_ACKNOW 0x000001 /* ack peer immediately */ 212 #define TF_DELACK 0x000002 /* ack, but try to delay it */ 213 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 214 #define TF_NOOPT 0x000008 /* don't use tcp options */ 215 #define TF_SENTFIN 0x000010 /* have sent FIN */ 216 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 217 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 218 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 219 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 220 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 221 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 222 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 223 #define TF_NOPUSH 0x001000 /* don't push */ 224 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 225 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 226 #define TF_LASTIDLE 0x040000 /* connection was previously idle */ 227 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 228 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 229 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 230 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 231 #define TF_FORCEDATA 0x800000 /* force out a byte */ 232 #define TF_TSO 0x1000000 /* TSO enabled on this connection */ 233 #define TF_TOE 0x2000000 /* this connection is offloaded */ 234 #define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */ 235 #define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */ 236 #define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */ 237 238 #define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY) 239 #define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY 240 #define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY 241 242 /* 243 * Flags for the t_oobflags field. 244 */ 245 #define TCPOOB_HAVEDATA 0x01 246 #define TCPOOB_HADDATA 0x02 247 248 #ifdef TCP_SIGNATURE 249 /* 250 * Defines which are needed by the xform_tcp module and tcp_[in|out]put 251 * for SADB verification and lookup. 252 */ 253 #define TCP_SIGLEN 16 /* length of computed digest in bytes */ 254 #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */ 255 #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */ 256 /* 257 * Only a single SA per host may be specified at this time. An SPI is 258 * needed in order for the KEY_ALLOCSA() lookup to work. 259 */ 260 #define TCP_SIG_SPI 0x1000 261 #endif /* TCP_SIGNATURE */ 262 263 /* 264 * Structure to hold TCP options that are only used during segment 265 * processing (in tcp_input), but not held in the tcpcb. 266 * It's basically used to reduce the number of parameters 267 * to tcp_dooptions and tcp_addoptions. 268 * The binary order of the to_flags is relevant for packing of the 269 * options in tcp_addoptions. 270 */ 271 struct tcpopt { 272 u_int64_t to_flags; /* which options are present */ 273 #define TOF_MSS 0x0001 /* maximum segment size */ 274 #define TOF_SCALE 0x0002 /* window scaling */ 275 #define TOF_SACKPERM 0x0004 /* SACK permitted */ 276 #define TOF_TS 0x0010 /* timestamp */ 277 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ 278 #define TOF_SACK 0x0080 /* Peer sent SACK option */ 279 #define TOF_MAXOPT 0x0100 280 u_int32_t to_tsval; /* new timestamp */ 281 u_int32_t to_tsecr; /* reflected timestamp */ 282 u_char *to_sacks; /* pointer to the first SACK blocks */ 283 u_char *to_signature; /* pointer to the TCP-MD5 signature */ 284 u_int16_t to_mss; /* maximum segment size */ 285 u_int8_t to_wscale; /* window scaling */ 286 u_int8_t to_nsacks; /* number of SACK blocks */ 287 }; 288 289 /* 290 * Flags for tcp_dooptions. 291 */ 292 #define TO_SYN 0x01 /* parse SYN-only options */ 293 294 struct hc_metrics_lite { /* must stay in sync with hc_metrics */ 295 u_long rmx_mtu; /* MTU for this path */ 296 u_long rmx_ssthresh; /* outbound gateway buffer limit */ 297 u_long rmx_rtt; /* estimated round trip time */ 298 u_long rmx_rttvar; /* estimated rtt variance */ 299 u_long rmx_bandwidth; /* estimated bandwidth */ 300 u_long rmx_cwnd; /* congestion window */ 301 u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 302 u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 303 }; 304 305 #ifndef _NETINET_IN_PCB_H_ 306 struct in_conninfo; 307 #endif /* _NETINET_IN_PCB_H_ */ 308 309 struct tcptw { 310 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 311 tcp_seq snd_nxt; 312 tcp_seq rcv_nxt; 313 tcp_seq iss; 314 tcp_seq irs; 315 u_short last_win; /* cached window value */ 316 u_short tw_so_options; /* copy of so_options */ 317 struct ucred *tw_cred; /* user credentials */ 318 u_int32_t t_recent; 319 u_int32_t ts_offset; /* our timestamp offset */ 320 u_int t_starttime; 321 int tw_time; 322 TAILQ_ENTRY(tcptw) tw_2msl; 323 }; 324 325 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 326 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 327 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 328 329 /* 330 * The smoothed round-trip time and estimated variance 331 * are stored as fixed point numbers scaled by the values below. 332 * For convenience, these scales are also used in smoothing the average 333 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 334 * With these scales, srtt has 3 bits to the right of the binary point, 335 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 336 * binary point, and is smoothed with an ALPHA of 0.75. 337 */ 338 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 339 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 340 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 341 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 342 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 343 344 /* 345 * The initial retransmission should happen at rtt + 4 * rttvar. 346 * Because of the way we do the smoothing, srtt and rttvar 347 * will each average +1/2 tick of bias. When we compute 348 * the retransmit timer, we want 1/2 tick of rounding and 349 * 1 extra tick because of +-1/2 tick uncertainty in the 350 * firing of the timer. The bias will give us exactly the 351 * 1.5 tick we need. But, because the bias is 352 * statistical, we have to test that we don't drop below 353 * the minimum feasible timer (which is 2 ticks). 354 * This version of the macro adapted from a paper by Lawrence 355 * Brakmo and Larry Peterson which outlines a problem caused 356 * by insufficient precision in the original implementation, 357 * which results in inappropriately large RTO values for very 358 * fast networks. 359 */ 360 #define TCP_REXMTVAL(tp) \ 361 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 362 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 363 364 /* 365 * TCP statistics. 366 * Many of these should be kept per connection, 367 * but that's inconvenient at the moment. 368 */ 369 struct tcpstat { 370 u_long tcps_connattempt; /* connections initiated */ 371 u_long tcps_accepts; /* connections accepted */ 372 u_long tcps_connects; /* connections established */ 373 u_long tcps_drops; /* connections dropped */ 374 u_long tcps_conndrops; /* embryonic connections dropped */ 375 u_long tcps_minmssdrops; /* average minmss too low drops */ 376 u_long tcps_closed; /* conn. closed (includes drops) */ 377 u_long tcps_segstimed; /* segs where we tried to get rtt */ 378 u_long tcps_rttupdated; /* times we succeeded */ 379 u_long tcps_delack; /* delayed acks sent */ 380 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 381 u_long tcps_rexmttimeo; /* retransmit timeouts */ 382 u_long tcps_persisttimeo; /* persist timeouts */ 383 u_long tcps_keeptimeo; /* keepalive timeouts */ 384 u_long tcps_keepprobe; /* keepalive probes sent */ 385 u_long tcps_keepdrops; /* connections dropped in keepalive */ 386 387 u_long tcps_sndtotal; /* total packets sent */ 388 u_long tcps_sndpack; /* data packets sent */ 389 u_long tcps_sndbyte; /* data bytes sent */ 390 u_long tcps_sndrexmitpack; /* data packets retransmitted */ 391 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 392 u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 393 u_long tcps_sndacks; /* ack-only packets sent */ 394 u_long tcps_sndprobe; /* window probes sent */ 395 u_long tcps_sndurg; /* packets sent with URG only */ 396 u_long tcps_sndwinup; /* window update-only packets sent */ 397 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 398 399 u_long tcps_rcvtotal; /* total packets received */ 400 u_long tcps_rcvpack; /* packets received in sequence */ 401 u_long tcps_rcvbyte; /* bytes received in sequence */ 402 u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 403 u_long tcps_rcvbadoff; /* packets received with bad offset */ 404 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 405 u_long tcps_rcvshort; /* packets received too short */ 406 u_long tcps_rcvduppack; /* duplicate-only packets received */ 407 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 408 u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 409 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 410 u_long tcps_rcvoopack; /* out-of-order packets received */ 411 u_long tcps_rcvoobyte; /* out-of-order bytes received */ 412 u_long tcps_rcvpackafterwin; /* packets with data after window */ 413 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 414 u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 415 u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 416 u_long tcps_rcvdupack; /* rcvd duplicate acks */ 417 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 418 u_long tcps_rcvackpack; /* rcvd ack packets */ 419 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 420 u_long tcps_rcvwinupd; /* rcvd window update packets */ 421 u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 422 u_long tcps_predack; /* times hdr predict ok for acks */ 423 u_long tcps_preddat; /* times hdr predict ok for data pkts */ 424 u_long tcps_pcbcachemiss; 425 u_long tcps_cachedrtt; /* times cached RTT in route updated */ 426 u_long tcps_cachedrttvar; /* times cached rttvar updated */ 427 u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 428 u_long tcps_usedrtt; /* times RTT initialized from route */ 429 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 430 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 431 u_long tcps_persistdrop; /* timeout in persist state */ 432 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 433 u_long tcps_mturesent; /* resends due to MTU discovery */ 434 u_long tcps_listendrop; /* listen queue overflows */ 435 u_long tcps_badrst; /* ignored RSTs in the window */ 436 437 u_long tcps_sc_added; /* entry added to syncache */ 438 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 439 u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 440 u_long tcps_sc_dropped; /* could not reply to packet */ 441 u_long tcps_sc_completed; /* successful extraction of entry */ 442 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 443 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 444 u_long tcps_sc_reset; /* RST removed entry from syncache */ 445 u_long tcps_sc_stale; /* timed out or listen socket gone */ 446 u_long tcps_sc_aborted; /* syncache entry aborted */ 447 u_long tcps_sc_badack; /* removed due to bad ACK */ 448 u_long tcps_sc_unreach; /* ICMP unreachable received */ 449 u_long tcps_sc_zonefail; /* zalloc() failed */ 450 u_long tcps_sc_sendcookie; /* SYN cookie sent */ 451 u_long tcps_sc_recvcookie; /* SYN cookie received */ 452 453 u_long tcps_hc_added; /* entry added to hostcache */ 454 u_long tcps_hc_bucketoverflow; /* hostcache per bucket limit hit */ 455 456 u_long tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ 457 458 /* SACK related stats */ 459 u_long tcps_sack_recovery_episode; /* SACK recovery episodes */ 460 u_long tcps_sack_rexmits; /* SACK rexmit segments */ 461 u_long tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 462 u_long tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 463 u_long tcps_sack_send_blocks; /* SACK blocks (options) sent */ 464 u_long tcps_sack_sboverflow; /* times scoreboard overflowed */ 465 466 /* ECN related stats */ 467 u_long tcps_ecn_ce; /* ECN Congestion Experienced */ 468 u_long tcps_ecn_ect0; /* ECN Capable Transport */ 469 u_long tcps_ecn_ect1; /* ECN Capable Transport */ 470 u_long tcps_ecn_shs; /* ECN successful handshakes */ 471 u_long tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */ 472 473 u_long _pad[12]; /* 6 UTO, 6 TBD */ 474 }; 475 476 #ifdef _KERNEL 477 /* 478 * In-kernel consumers can use these accessor macros directly to update 479 * stats. 480 */ 481 #define TCPSTAT_ADD(name, val) V_tcpstat.name += (val) 482 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1) 483 484 /* 485 * Kernel module consumers must use this accessor macro. 486 */ 487 void kmod_tcpstat_inc(int statnum); 488 #define KMOD_TCPSTAT_INC(name) \ 489 kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(u_long)) 490 #endif 491 492 /* 493 * TCB structure exported to user-land via sysctl(3). 494 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 495 * included. Not all of our clients do. 496 */ 497 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 498 struct xtcp_timer { 499 int tt_rexmt; /* retransmit timer */ 500 int tt_persist; /* retransmit persistence */ 501 int tt_keep; /* keepalive */ 502 int tt_2msl; /* 2*msl TIME_WAIT timer */ 503 int tt_delack; /* delayed ACK timer */ 504 int t_rcvtime; /* Time since last packet received */ 505 }; 506 struct xtcpcb { 507 size_t xt_len; 508 struct inpcb xt_inp; 509 struct tcpcb xt_tp; 510 struct xsocket xt_socket; 511 struct xtcp_timer xt_timer; 512 u_quad_t xt_alignment_hack; 513 }; 514 #endif 515 516 /* 517 * Names for TCP sysctl objects 518 */ 519 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 520 #define TCPCTL_MSSDFLT 3 /* MSS default */ 521 #define TCPCTL_STATS 4 /* statistics (read-only) */ 522 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 523 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 524 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 525 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 526 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 527 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 528 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 529 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 530 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 531 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 532 #define TCPCTL_DROP 15 /* drop tcp connection */ 533 #define TCPCTL_MAXID 16 534 #define TCPCTL_FINWAIT2_TIMEOUT 17 535 536 #define TCPCTL_NAMES { \ 537 { 0, 0 }, \ 538 { "rfc1323", CTLTYPE_INT }, \ 539 { "mssdflt", CTLTYPE_INT }, \ 540 { "stats", CTLTYPE_STRUCT }, \ 541 { "rttdflt", CTLTYPE_INT }, \ 542 { "keepidle", CTLTYPE_INT }, \ 543 { "keepintvl", CTLTYPE_INT }, \ 544 { "sendspace", CTLTYPE_INT }, \ 545 { "recvspace", CTLTYPE_INT }, \ 546 { "keepinit", CTLTYPE_INT }, \ 547 { "pcblist", CTLTYPE_STRUCT }, \ 548 { "delacktime", CTLTYPE_INT }, \ 549 { "v6mssdflt", CTLTYPE_INT }, \ 550 { "maxid", CTLTYPE_INT }, \ 551 } 552 553 554 #ifdef _KERNEL 555 #ifdef SYSCTL_DECL 556 SYSCTL_DECL(_net_inet_tcp); 557 SYSCTL_DECL(_net_inet_tcp_sack); 558 MALLOC_DECLARE(M_TCPLOG); 559 #endif 560 561 VNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */ 562 VNET_DECLARE(struct inpcbinfo, tcbinfo); 563 VNET_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */ 564 extern int tcp_log_in_vain; 565 VNET_DECLARE(int, tcp_mssdflt); /* XXX */ 566 VNET_DECLARE(int, tcp_minmss); 567 VNET_DECLARE(int, tcp_delack_enabled); 568 VNET_DECLARE(int, tcp_do_newreno); 569 VNET_DECLARE(int, path_mtu_discovery); 570 VNET_DECLARE(int, ss_fltsz); 571 VNET_DECLARE(int, ss_fltsz_local); 572 #define V_tcb VNET(tcb) 573 #define V_tcbinfo VNET(tcbinfo) 574 #define V_tcpstat VNET(tcpstat) 575 #define V_tcp_mssdflt VNET(tcp_mssdflt) 576 #define V_tcp_minmss VNET(tcp_minmss) 577 #define V_tcp_delack_enabled VNET(tcp_delack_enabled) 578 #define V_tcp_do_newreno VNET(tcp_do_newreno) 579 #define V_path_mtu_discovery VNET(path_mtu_discovery) 580 #define V_ss_fltsz VNET(ss_fltsz) 581 #define V_ss_fltsz_local VNET(ss_fltsz_local) 582 583 VNET_DECLARE(int, tcp_do_sack); /* SACK enabled/disabled */ 584 VNET_DECLARE(int, tcp_sc_rst_sock_fail); /* RST on sock alloc failure */ 585 #define V_tcp_do_sack VNET(tcp_do_sack) 586 #define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail) 587 588 VNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */ 589 VNET_DECLARE(int, tcp_ecn_maxretries); 590 #define V_tcp_do_ecn VNET(tcp_do_ecn) 591 #define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries) 592 593 int tcp_addoptions(struct tcpopt *, u_char *); 594 struct tcpcb * 595 tcp_close(struct tcpcb *); 596 void tcp_discardcb(struct tcpcb *); 597 void tcp_twstart(struct tcpcb *); 598 #if 0 599 int tcp_twrecycleable(struct tcptw *tw); 600 #endif 601 void tcp_twclose(struct tcptw *_tw, int _reuse); 602 void tcp_ctlinput(int, struct sockaddr *, void *); 603 int tcp_ctloutput(struct socket *, struct sockopt *); 604 struct tcpcb * 605 tcp_drop(struct tcpcb *, int); 606 void tcp_drain(void); 607 void tcp_init(void); 608 #ifdef VIMAGE 609 void tcp_destroy(void); 610 #endif 611 void tcp_fini(void *); 612 char *tcp_log_addrs(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 #ifdef VIMAGE 617 void tcp_reass_destroy(void); 618 #endif 619 void tcp_input(struct mbuf *, int); 620 u_long tcp_maxmtu(struct in_conninfo *, int *); 621 u_long tcp_maxmtu6(struct in_conninfo *, int *); 622 void tcp_mss_update(struct tcpcb *, int, struct hc_metrics_lite *, int *); 623 void tcp_mss(struct tcpcb *, int); 624 int tcp_mssopt(struct in_conninfo *); 625 struct inpcb * 626 tcp_drop_syn_sent(struct inpcb *, int); 627 struct inpcb * 628 tcp_mtudisc(struct inpcb *, int); 629 struct tcpcb * 630 tcp_newtcpcb(struct inpcb *); 631 int tcp_output(struct tcpcb *); 632 void tcp_respond(struct tcpcb *, void *, 633 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 634 void tcp_tw_init(void); 635 #ifdef VIMAGE 636 void tcp_tw_destroy(void); 637 #endif 638 void tcp_tw_zone_change(void); 639 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *, 640 struct mbuf *, int); 641 int tcp_twrespond(struct tcptw *, int); 642 void tcp_setpersist(struct tcpcb *); 643 #ifdef TCP_SIGNATURE 644 int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int); 645 #endif 646 void tcp_slowtimo(void); 647 struct tcptemp * 648 tcpip_maketemplate(struct inpcb *); 649 void tcpip_fillheaders(struct inpcb *, void *, void *); 650 void tcp_timer_activate(struct tcpcb *, int, u_int); 651 int tcp_timer_active(struct tcpcb *, int); 652 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); 653 void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); 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