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 #include <sys/mbuf.h> 41 42 /* 43 * Kernel variables for tcp. 44 */ 45 VNET_DECLARE(int, tcp_do_rfc1323); 46 #define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323) 47 48 #endif /* _KERNEL */ 49 50 /* TCP segment queue entry */ 51 struct tseg_qent { 52 LIST_ENTRY(tseg_qent) tqe_q; 53 int tqe_len; /* TCP segment data length */ 54 struct tcphdr *tqe_th; /* a pointer to tcp header */ 55 struct mbuf *tqe_m; /* mbuf contains packet */ 56 }; 57 LIST_HEAD(tsegqe_head, tseg_qent); 58 59 struct sackblk { 60 tcp_seq start; /* start seq no. of sack block */ 61 tcp_seq end; /* end seq no. */ 62 }; 63 64 struct sackhole { 65 tcp_seq start; /* start seq no. of hole */ 66 tcp_seq end; /* end seq no. */ 67 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ 68 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */ 69 }; 70 71 struct sackhint { 72 struct sackhole *nexthole; 73 int sack_bytes_rexmit; 74 tcp_seq last_sack_ack; /* Most recent/largest sacked ack */ 75 76 int ispare; /* explicit pad for 64bit alignment */ 77 int sacked_bytes; /* 78 * Total sacked bytes reported by the 79 * receiver via sack option 80 */ 81 uint32_t _pad1[1]; /* TBD */ 82 uint64_t _pad[1]; /* TBD */ 83 }; 84 85 struct tcptemp { 86 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 87 struct tcphdr tt_t; 88 }; 89 90 #define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 91 92 /* 93 * TODO: We yet need to brave plowing in 94 * to tcp_input() and the pru_usrreq() block. 95 * Right now these go to the old standards which 96 * are somewhat ok, but in the long term may 97 * need to be changed. If we do tackle tcp_input() 98 * then we need to get rid of the tcp_do_segment() 99 * function below. 100 */ 101 /* Flags for tcp functions */ 102 #define TCP_FUNC_BEING_REMOVED 0x01 /* Can no longer be referenced */ 103 struct tcpcb; 104 struct inpcb; 105 struct sockopt; 106 struct socket; 107 108 struct tcp_function_block { 109 char tfb_tcp_block_name[TCP_FUNCTION_NAME_LEN_MAX]; 110 int (*tfb_tcp_output)(struct tcpcb *); 111 void (*tfb_tcp_do_segment)(struct mbuf *, struct tcphdr *, 112 struct socket *, struct tcpcb *, 113 int, int, uint8_t, 114 int); 115 int (*tfb_tcp_ctloutput)(struct socket *so, struct sockopt *sopt, 116 struct inpcb *inp, struct tcpcb *tp); 117 /* Optional memory allocation/free routine */ 118 void (*tfb_tcp_fb_init)(struct tcpcb *); 119 void (*tfb_tcp_fb_fini)(struct tcpcb *); 120 /* Optional timers, must define all if you define one */ 121 int (*tfb_tcp_timer_stop_all)(struct tcpcb *); 122 int (*tfb_tcp_timers_left)(struct tcpcb *); 123 void (*tfb_tcp_timer_activate)(struct tcpcb *, 124 uint32_t, u_int); 125 int (*tfb_tcp_timer_active)(struct tcpcb *, uint32_t); 126 void (*tfb_tcp_timer_stop)(struct tcpcb *, uint32_t); 127 volatile uint32_t tfb_refcnt; 128 uint32_t tfb_flags; 129 }; 130 131 struct tcp_function { 132 TAILQ_ENTRY(tcp_function) tf_next; 133 struct tcp_function_block *tf_fb; 134 }; 135 136 TAILQ_HEAD(tcp_funchead, tcp_function); 137 138 /* 139 * Tcp control block, one per tcp; fields: 140 * Organized for 16 byte cacheline efficiency. 141 */ 142 struct tcpcb { 143 struct tsegqe_head t_segq; /* segment reassembly queue */ 144 void *t_pspare[2]; /* new reassembly queue */ 145 int t_segqlen; /* segment reassembly queue length */ 146 int t_dupacks; /* consecutive dup acks recd */ 147 148 struct tcp_timer *t_timers; /* All the TCP timers in one struct */ 149 150 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 151 int t_state; /* state of this connection */ 152 u_int t_flags; 153 154 struct vnet *t_vnet; /* back pointer to parent vnet */ 155 156 tcp_seq snd_una; /* sent but unacknowledged */ 157 tcp_seq snd_max; /* highest sequence number sent; 158 * used to recognize retransmits 159 */ 160 tcp_seq snd_nxt; /* send next */ 161 tcp_seq snd_up; /* send urgent pointer */ 162 163 tcp_seq snd_wl1; /* window update seg seq number */ 164 tcp_seq snd_wl2; /* window update seg ack number */ 165 tcp_seq iss; /* initial send sequence number */ 166 tcp_seq irs; /* initial receive sequence number */ 167 168 tcp_seq rcv_nxt; /* receive next */ 169 tcp_seq rcv_adv; /* advertised window */ 170 u_long rcv_wnd; /* receive window */ 171 tcp_seq rcv_up; /* receive urgent pointer */ 172 173 u_long snd_wnd; /* send window */ 174 u_long snd_cwnd; /* congestion-controlled window */ 175 u_long snd_spare1; /* unused */ 176 u_long snd_ssthresh; /* snd_cwnd size threshold for 177 * for slow start exponential to 178 * linear switch 179 */ 180 u_long snd_spare2; /* unused */ 181 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 182 183 u_int t_rcvtime; /* inactivity time */ 184 u_int t_starttime; /* time connection was established */ 185 u_int t_rtttime; /* RTT measurement start time */ 186 tcp_seq t_rtseq; /* sequence number being timed */ 187 188 u_int t_bw_spare1; /* unused */ 189 tcp_seq t_bw_spare2; /* unused */ 190 191 int t_rxtcur; /* current retransmit value (ticks) */ 192 u_int t_maxseg; /* maximum segment size */ 193 u_int t_pmtud_saved_maxseg; /* pre-blackhole MSS */ 194 int t_srtt; /* smoothed round-trip time */ 195 int t_rttvar; /* variance in round-trip time */ 196 197 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 198 u_int t_rttmin; /* minimum rtt allowed */ 199 u_int t_rttbest; /* best rtt we've seen */ 200 u_long t_rttupdated; /* number of times rtt sampled */ 201 u_long max_sndwnd; /* largest window peer has offered */ 202 203 int t_softerror; /* possible error not yet reported */ 204 /* out-of-band data */ 205 char t_oobflags; /* have some */ 206 char t_iobc; /* input character */ 207 /* RFC 1323 variables */ 208 u_char snd_scale; /* window scaling for send window */ 209 u_char rcv_scale; /* window scaling for recv window */ 210 u_char request_r_scale; /* pending window scaling */ 211 u_int32_t ts_recent; /* timestamp echo data */ 212 u_int ts_recent_age; /* when last updated */ 213 u_int32_t ts_offset; /* our timestamp offset */ 214 215 tcp_seq last_ack_sent; 216 /* experimental */ 217 u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 218 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 219 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 220 int t_sndzerowin; /* zero-window updates sent */ 221 u_int t_badrxtwin; /* window for retransmit recovery */ 222 u_char snd_limited; /* segments limited transmitted */ 223 /* SACK related state */ 224 int snd_numholes; /* number of holes seen by sender */ 225 TAILQ_HEAD(sackhole_head, sackhole) snd_holes; 226 /* SACK scoreboard (sorted) */ 227 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ 228 int rcv_numsacks; /* # distinct sack blks present */ 229 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 230 tcp_seq sack_newdata; /* New data xmitted in this recovery 231 episode starts at this seq number */ 232 struct sackhint sackhint; /* SACK scoreboard hint */ 233 int t_rttlow; /* smallest observerved RTT */ 234 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ 235 int rfbuf_cnt; /* recv buffer autoscaling byte count */ 236 struct toedev *tod; /* toedev handling this connection */ 237 int t_sndrexmitpack; /* retransmit packets sent */ 238 int t_rcvoopack; /* out-of-order packets received */ 239 void *t_toe; /* TOE pcb pointer */ 240 int t_bytes_acked; /* # bytes acked during current RTT */ 241 struct cc_algo *cc_algo; /* congestion control algorithm */ 242 struct cc_var *ccv; /* congestion control specific vars */ 243 struct osd *osd; /* storage for Khelp module data */ 244 245 u_int t_keepinit; /* time to establish connection */ 246 u_int t_keepidle; /* time before keepalive probes begin */ 247 u_int t_keepintvl; /* interval between keepalives */ 248 u_int t_keepcnt; /* number of keepalives before close */ 249 250 u_int t_tsomax; /* TSO total burst length limit in bytes */ 251 u_int t_tsomaxsegcount; /* TSO maximum segment count */ 252 u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */ 253 u_int t_flags2; /* More tcpcb flags storage */ 254 #if defined(_KERNEL) && defined(TCP_RFC7413) 255 uint32_t t_ispare[6]; /* 5 UTO, 1 TBD */ 256 uint64_t t_tfo_cookie; /* TCP Fast Open cookie */ 257 #else 258 uint32_t t_ispare[8]; /* 5 UTO, 3 TBD */ 259 #endif 260 struct tcp_function_block *t_fb;/* TCP function call block */ 261 void *t_fb_ptr; /* Pointer to t_fb specific data */ 262 #if defined(_KERNEL) && defined(TCP_RFC7413) 263 unsigned int *t_tfo_pending; /* TCP Fast Open pending counter */ 264 void *t_pspare2[1]; /* 1 TCP_SIGNATURE */ 265 #else 266 void *t_pspare2[2]; /* 1 TCP_SIGNATURE, 1 TBD */ 267 #endif 268 #if defined(_KERNEL) && defined(TCPPCAP) 269 struct mbufq t_inpkts; /* List of saved input packets. */ 270 struct mbufq t_outpkts; /* List of saved output packets. */ 271 #ifdef _LP64 272 uint64_t _pad[0]; /* all used! */ 273 #else 274 uint64_t _pad[2]; /* 2 are available */ 275 #endif /* _LP64 */ 276 #else 277 uint64_t _pad[6]; 278 #endif /* defined(_KERNEL) && defined(TCPPCAP) */ 279 }; 280 281 /* 282 * Flags and utility macros for the t_flags field. 283 */ 284 #define TF_ACKNOW 0x000001 /* ack peer immediately */ 285 #define TF_DELACK 0x000002 /* ack, but try to delay it */ 286 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 287 #define TF_NOOPT 0x000008 /* don't use tcp options */ 288 #define TF_SENTFIN 0x000010 /* have sent FIN */ 289 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 290 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 291 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 292 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 293 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 294 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 295 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 296 #define TF_NOPUSH 0x001000 /* don't push */ 297 #define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */ 298 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 299 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 300 #define TF_LASTIDLE 0x040000 /* connection was previously idle */ 301 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 302 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 303 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 304 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 305 #define TF_FORCEDATA 0x800000 /* force out a byte */ 306 #define TF_TSO 0x1000000 /* TSO enabled on this connection */ 307 #define TF_TOE 0x2000000 /* this connection is offloaded */ 308 #define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */ 309 #define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */ 310 #define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */ 311 #define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */ 312 #define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */ 313 #define TF_FASTOPEN 0x80000000 /* TCP Fast Open indication */ 314 315 #define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY) 316 #define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY 317 #define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY 318 319 #define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY) 320 #define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY 321 #define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY 322 323 #define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY)) 324 #define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY) 325 #define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY) 326 327 #define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una) 328 329 /* 330 * Flags for the t_oobflags field. 331 */ 332 #define TCPOOB_HAVEDATA 0x01 333 #define TCPOOB_HADDATA 0x02 334 335 #ifdef TCP_SIGNATURE 336 /* 337 * Defines which are needed by the xform_tcp module and tcp_[in|out]put 338 * for SADB verification and lookup. 339 */ 340 #define TCP_SIGLEN 16 /* length of computed digest in bytes */ 341 #define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */ 342 #define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */ 343 /* 344 * Only a single SA per host may be specified at this time. An SPI is 345 * needed in order for the KEY_ALLOCSA() lookup to work. 346 */ 347 #define TCP_SIG_SPI 0x1000 348 #endif /* TCP_SIGNATURE */ 349 350 /* 351 * Flags for PLPMTU handling, t_flags2 352 */ 353 #define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */ 354 #define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */ 355 #define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */ 356 357 /* 358 * Structure to hold TCP options that are only used during segment 359 * processing (in tcp_input), but not held in the tcpcb. 360 * It's basically used to reduce the number of parameters 361 * to tcp_dooptions and tcp_addoptions. 362 * The binary order of the to_flags is relevant for packing of the 363 * options in tcp_addoptions. 364 */ 365 struct tcpopt { 366 u_int64_t to_flags; /* which options are present */ 367 #define TOF_MSS 0x0001 /* maximum segment size */ 368 #define TOF_SCALE 0x0002 /* window scaling */ 369 #define TOF_SACKPERM 0x0004 /* SACK permitted */ 370 #define TOF_TS 0x0010 /* timestamp */ 371 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ 372 #define TOF_SACK 0x0080 /* Peer sent SACK option */ 373 #define TOF_FASTOPEN 0x0100 /* TCP Fast Open (TFO) cookie */ 374 #define TOF_MAXOPT 0x0200 375 u_int32_t to_tsval; /* new timestamp */ 376 u_int32_t to_tsecr; /* reflected timestamp */ 377 u_char *to_sacks; /* pointer to the first SACK blocks */ 378 u_char *to_signature; /* pointer to the TCP-MD5 signature */ 379 u_char *to_tfo_cookie; /* pointer to the TFO cookie */ 380 u_int16_t to_mss; /* maximum segment size */ 381 u_int8_t to_wscale; /* window scaling */ 382 u_int8_t to_nsacks; /* number of SACK blocks */ 383 u_int8_t to_tfo_len; /* TFO cookie length */ 384 u_int32_t to_spare; /* UTO */ 385 }; 386 387 /* 388 * Flags for tcp_dooptions. 389 */ 390 #define TO_SYN 0x01 /* parse SYN-only options */ 391 392 struct hc_metrics_lite { /* must stay in sync with hc_metrics */ 393 u_long rmx_mtu; /* MTU for this path */ 394 u_long rmx_ssthresh; /* outbound gateway buffer limit */ 395 u_long rmx_rtt; /* estimated round trip time */ 396 u_long rmx_rttvar; /* estimated rtt variance */ 397 u_long rmx_cwnd; /* congestion window */ 398 u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 399 u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 400 }; 401 402 /* 403 * Used by tcp_maxmtu() to communicate interface specific features 404 * and limits at the time of connection setup. 405 */ 406 struct tcp_ifcap { 407 int ifcap; 408 u_int tsomax; 409 u_int tsomaxsegcount; 410 u_int tsomaxsegsize; 411 }; 412 413 #ifndef _NETINET_IN_PCB_H_ 414 struct in_conninfo; 415 #endif /* _NETINET_IN_PCB_H_ */ 416 417 struct tcptw { 418 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 419 tcp_seq snd_nxt; 420 tcp_seq rcv_nxt; 421 tcp_seq iss; 422 tcp_seq irs; 423 u_short last_win; /* cached window value */ 424 u_short tw_so_options; /* copy of so_options */ 425 struct ucred *tw_cred; /* user credentials */ 426 u_int32_t t_recent; 427 u_int32_t ts_offset; /* our timestamp offset */ 428 u_int t_starttime; 429 int tw_time; 430 TAILQ_ENTRY(tcptw) tw_2msl; 431 void *tw_pspare; /* TCP_SIGNATURE */ 432 u_int *tw_spare; /* TCP_SIGNATURE */ 433 }; 434 435 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 436 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 437 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 438 439 /* 440 * The smoothed round-trip time and estimated variance 441 * are stored as fixed point numbers scaled by the values below. 442 * For convenience, these scales are also used in smoothing the average 443 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 444 * With these scales, srtt has 3 bits to the right of the binary point, 445 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 446 * binary point, and is smoothed with an ALPHA of 0.75. 447 */ 448 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 449 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 450 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 451 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 452 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 453 454 /* 455 * The initial retransmission should happen at rtt + 4 * rttvar. 456 * Because of the way we do the smoothing, srtt and rttvar 457 * will each average +1/2 tick of bias. When we compute 458 * the retransmit timer, we want 1/2 tick of rounding and 459 * 1 extra tick because of +-1/2 tick uncertainty in the 460 * firing of the timer. The bias will give us exactly the 461 * 1.5 tick we need. But, because the bias is 462 * statistical, we have to test that we don't drop below 463 * the minimum feasible timer (which is 2 ticks). 464 * This version of the macro adapted from a paper by Lawrence 465 * Brakmo and Larry Peterson which outlines a problem caused 466 * by insufficient precision in the original implementation, 467 * which results in inappropriately large RTO values for very 468 * fast networks. 469 */ 470 #define TCP_REXMTVAL(tp) \ 471 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 472 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 473 474 /* 475 * TCP statistics. 476 * Many of these should be kept per connection, 477 * but that's inconvenient at the moment. 478 */ 479 struct tcpstat { 480 uint64_t tcps_connattempt; /* connections initiated */ 481 uint64_t tcps_accepts; /* connections accepted */ 482 uint64_t tcps_connects; /* connections established */ 483 uint64_t tcps_drops; /* connections dropped */ 484 uint64_t tcps_conndrops; /* embryonic connections dropped */ 485 uint64_t tcps_minmssdrops; /* average minmss too low drops */ 486 uint64_t tcps_closed; /* conn. closed (includes drops) */ 487 uint64_t tcps_segstimed; /* segs where we tried to get rtt */ 488 uint64_t tcps_rttupdated; /* times we succeeded */ 489 uint64_t tcps_delack; /* delayed acks sent */ 490 uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 491 uint64_t tcps_rexmttimeo; /* retransmit timeouts */ 492 uint64_t tcps_persisttimeo; /* persist timeouts */ 493 uint64_t tcps_keeptimeo; /* keepalive timeouts */ 494 uint64_t tcps_keepprobe; /* keepalive probes sent */ 495 uint64_t tcps_keepdrops; /* connections dropped in keepalive */ 496 497 uint64_t tcps_sndtotal; /* total packets sent */ 498 uint64_t tcps_sndpack; /* data packets sent */ 499 uint64_t tcps_sndbyte; /* data bytes sent */ 500 uint64_t tcps_sndrexmitpack; /* data packets retransmitted */ 501 uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 502 uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 503 uint64_t tcps_sndacks; /* ack-only packets sent */ 504 uint64_t tcps_sndprobe; /* window probes sent */ 505 uint64_t tcps_sndurg; /* packets sent with URG only */ 506 uint64_t tcps_sndwinup; /* window update-only packets sent */ 507 uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 508 509 uint64_t tcps_rcvtotal; /* total packets received */ 510 uint64_t tcps_rcvpack; /* packets received in sequence */ 511 uint64_t tcps_rcvbyte; /* bytes received in sequence */ 512 uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */ 513 uint64_t tcps_rcvbadoff; /* packets received with bad offset */ 514 uint64_t tcps_rcvreassfull; /* packets dropped for no reass space */ 515 uint64_t tcps_rcvshort; /* packets received too short */ 516 uint64_t tcps_rcvduppack; /* duplicate-only packets received */ 517 uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 518 uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */ 519 uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 520 uint64_t tcps_rcvoopack; /* out-of-order packets received */ 521 uint64_t tcps_rcvoobyte; /* out-of-order bytes received */ 522 uint64_t tcps_rcvpackafterwin; /* packets with data after window */ 523 uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 524 uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */ 525 uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */ 526 uint64_t tcps_rcvdupack; /* rcvd duplicate acks */ 527 uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 528 uint64_t tcps_rcvackpack; /* rcvd ack packets */ 529 uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 530 uint64_t tcps_rcvwinupd; /* rcvd window update packets */ 531 uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */ 532 uint64_t tcps_predack; /* times hdr predict ok for acks */ 533 uint64_t tcps_preddat; /* times hdr predict ok for data pkts */ 534 uint64_t tcps_pcbcachemiss; 535 uint64_t tcps_cachedrtt; /* times cached RTT in route updated */ 536 uint64_t tcps_cachedrttvar; /* times cached rttvar updated */ 537 uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */ 538 uint64_t tcps_usedrtt; /* times RTT initialized from route */ 539 uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */ 540 uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/ 541 uint64_t tcps_persistdrop; /* timeout in persist state */ 542 uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 543 uint64_t tcps_mturesent; /* resends due to MTU discovery */ 544 uint64_t tcps_listendrop; /* listen queue overflows */ 545 uint64_t tcps_badrst; /* ignored RSTs in the window */ 546 547 uint64_t tcps_sc_added; /* entry added to syncache */ 548 uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */ 549 uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */ 550 uint64_t tcps_sc_dropped; /* could not reply to packet */ 551 uint64_t tcps_sc_completed; /* successful extraction of entry */ 552 uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */ 553 uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */ 554 uint64_t tcps_sc_reset; /* RST removed entry from syncache */ 555 uint64_t tcps_sc_stale; /* timed out or listen socket gone */ 556 uint64_t tcps_sc_aborted; /* syncache entry aborted */ 557 uint64_t tcps_sc_badack; /* removed due to bad ACK */ 558 uint64_t tcps_sc_unreach; /* ICMP unreachable received */ 559 uint64_t tcps_sc_zonefail; /* zalloc() failed */ 560 uint64_t tcps_sc_sendcookie; /* SYN cookie sent */ 561 uint64_t tcps_sc_recvcookie; /* SYN cookie received */ 562 563 uint64_t tcps_hc_added; /* entry added to hostcache */ 564 uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */ 565 566 uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ 567 568 /* SACK related stats */ 569 uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */ 570 uint64_t tcps_sack_rexmits; /* SACK rexmit segments */ 571 uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 572 uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 573 uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */ 574 uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */ 575 576 /* ECN related stats */ 577 uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */ 578 uint64_t tcps_ecn_ect0; /* ECN Capable Transport */ 579 uint64_t tcps_ecn_ect1; /* ECN Capable Transport */ 580 uint64_t tcps_ecn_shs; /* ECN successful handshakes */ 581 uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */ 582 583 /* TCP_SIGNATURE related stats */ 584 uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */ 585 uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */ 586 uint64_t tcps_sig_err_buildsig; /* Mismatching signature received */ 587 uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */ 588 uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */ 589 590 uint64_t _pad[12]; /* 6 UTO, 6 TBD */ 591 }; 592 593 #define tcps_rcvmemdrop tcps_rcvreassfull /* compat */ 594 595 #ifdef _KERNEL 596 #define TI_UNLOCKED 1 597 #define TI_RLOCKED 2 598 #include <sys/counter.h> 599 600 VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */ 601 /* 602 * In-kernel consumers can use these accessor macros directly to update 603 * stats. 604 */ 605 #define TCPSTAT_ADD(name, val) \ 606 VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val)) 607 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1) 608 609 /* 610 * Kernel module consumers must use this accessor macro. 611 */ 612 void kmod_tcpstat_inc(int statnum); 613 #define KMOD_TCPSTAT_INC(name) \ 614 kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(uint64_t)) 615 616 /* 617 * TCP specific helper hook point identifiers. 618 */ 619 #define HHOOK_TCP_EST_IN 0 620 #define HHOOK_TCP_EST_OUT 1 621 #define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT 622 623 struct tcp_hhook_data { 624 struct tcpcb *tp; 625 struct tcphdr *th; 626 struct tcpopt *to; 627 long len; 628 int tso; 629 tcp_seq curack; 630 }; 631 #endif 632 633 /* 634 * TCB structure exported to user-land via sysctl(3). 635 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 636 * included. Not all of our clients do. 637 */ 638 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 639 struct xtcp_timer { 640 int tt_rexmt; /* retransmit timer */ 641 int tt_persist; /* retransmit persistence */ 642 int tt_keep; /* keepalive */ 643 int tt_2msl; /* 2*msl TIME_WAIT timer */ 644 int tt_delack; /* delayed ACK timer */ 645 int t_rcvtime; /* Time since last packet received */ 646 }; 647 struct xtcpcb { 648 size_t xt_len; 649 struct inpcb xt_inp; 650 struct tcpcb xt_tp; 651 struct xsocket xt_socket; 652 struct xtcp_timer xt_timer; 653 u_quad_t xt_alignment_hack; 654 }; 655 #endif 656 657 /* 658 * Identifiers for TCP sysctl nodes 659 */ 660 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 661 #define TCPCTL_MSSDFLT 3 /* MSS default */ 662 #define TCPCTL_STATS 4 /* statistics (read-only) */ 663 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 664 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 665 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 666 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 667 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 668 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 669 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 670 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 671 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 672 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 673 #define TCPCTL_DROP 15 /* drop tcp connection */ 674 675 #ifdef _KERNEL 676 #ifdef SYSCTL_DECL 677 SYSCTL_DECL(_net_inet_tcp); 678 SYSCTL_DECL(_net_inet_tcp_sack); 679 MALLOC_DECLARE(M_TCPLOG); 680 #endif 681 682 VNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */ 683 VNET_DECLARE(struct inpcbinfo, tcbinfo); 684 extern int tcp_log_in_vain; 685 VNET_DECLARE(int, tcp_mssdflt); /* XXX */ 686 VNET_DECLARE(int, tcp_minmss); 687 VNET_DECLARE(int, tcp_delack_enabled); 688 VNET_DECLARE(int, tcp_do_rfc3390); 689 VNET_DECLARE(int, tcp_initcwnd_segments); 690 VNET_DECLARE(int, tcp_sendspace); 691 VNET_DECLARE(int, tcp_recvspace); 692 VNET_DECLARE(int, path_mtu_discovery); 693 VNET_DECLARE(int, tcp_do_rfc3465); 694 VNET_DECLARE(int, tcp_abc_l_var); 695 #define V_tcb VNET(tcb) 696 #define V_tcbinfo VNET(tcbinfo) 697 #define V_tcp_mssdflt VNET(tcp_mssdflt) 698 #define V_tcp_minmss VNET(tcp_minmss) 699 #define V_tcp_delack_enabled VNET(tcp_delack_enabled) 700 #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) 701 #define V_tcp_initcwnd_segments VNET(tcp_initcwnd_segments) 702 #define V_tcp_sendspace VNET(tcp_sendspace) 703 #define V_tcp_recvspace VNET(tcp_recvspace) 704 #define V_path_mtu_discovery VNET(path_mtu_discovery) 705 #define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465) 706 #define V_tcp_abc_l_var VNET(tcp_abc_l_var) 707 708 VNET_DECLARE(int, tcp_do_sack); /* SACK enabled/disabled */ 709 VNET_DECLARE(int, tcp_sc_rst_sock_fail); /* RST on sock alloc failure */ 710 #define V_tcp_do_sack VNET(tcp_do_sack) 711 #define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail) 712 713 VNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */ 714 VNET_DECLARE(int, tcp_ecn_maxretries); 715 #define V_tcp_do_ecn VNET(tcp_do_ecn) 716 #define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries) 717 718 VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]); 719 #define V_tcp_hhh VNET(tcp_hhh) 720 721 VNET_DECLARE(int, tcp_do_rfc6675_pipe); 722 #define V_tcp_do_rfc6675_pipe VNET(tcp_do_rfc6675_pipe) 723 724 int tcp_addoptions(struct tcpopt *, u_char *); 725 int tcp_ccalgounload(struct cc_algo *unload_algo); 726 struct tcpcb * 727 tcp_close(struct tcpcb *); 728 void tcp_discardcb(struct tcpcb *); 729 void tcp_twstart(struct tcpcb *); 730 void tcp_twclose(struct tcptw *, int); 731 void tcp_ctlinput(int, struct sockaddr *, void *); 732 int tcp_ctloutput(struct socket *, struct sockopt *); 733 struct tcpcb * 734 tcp_drop(struct tcpcb *, int); 735 void tcp_drain(void); 736 void tcp_init(void); 737 #ifdef VIMAGE 738 void tcp_destroy(void); 739 #endif 740 void tcp_fini(void *); 741 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *, 742 const void *); 743 char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *, 744 const void *); 745 int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *); 746 void tcp_reass_global_init(void); 747 void tcp_reass_flush(struct tcpcb *); 748 void tcp_dooptions(struct tcpopt *, u_char *, int, int); 749 void tcp_dropwithreset(struct mbuf *, struct tcphdr *, 750 struct tcpcb *, int, int); 751 void tcp_pulloutofband(struct socket *, 752 struct tcphdr *, struct mbuf *, int); 753 void tcp_xmit_timer(struct tcpcb *, int); 754 void tcp_newreno_partial_ack(struct tcpcb *, struct tcphdr *); 755 void cc_ack_received(struct tcpcb *tp, struct tcphdr *th, 756 uint16_t type); 757 void cc_conn_init(struct tcpcb *tp); 758 void cc_post_recovery(struct tcpcb *tp, struct tcphdr *th); 759 void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type); 760 void hhook_run_tcp_est_in(struct tcpcb *tp, 761 struct tcphdr *th, struct tcpopt *to); 762 763 int tcp_input(struct mbuf **, int *, int); 764 void tcp_do_segment(struct mbuf *, struct tcphdr *, 765 struct socket *, struct tcpcb *, int, int, uint8_t, 766 int); 767 768 int register_tcp_functions(struct tcp_function_block *blk, int wait); 769 int deregister_tcp_functions(struct tcp_function_block *blk); 770 struct tcp_function_block *find_and_ref_tcp_functions(struct tcp_function_set *fs); 771 struct tcp_function_block *find_and_ref_tcp_fb(struct tcp_function_block *blk); 772 int tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp); 773 774 u_long tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *); 775 u_long tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *); 776 u_int tcp_maxseg(const struct tcpcb *); 777 void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *, 778 struct tcp_ifcap *); 779 void tcp_mss(struct tcpcb *, int); 780 int tcp_mssopt(struct in_conninfo *); 781 struct inpcb * 782 tcp_drop_syn_sent(struct inpcb *, int); 783 struct tcpcb * 784 tcp_newtcpcb(struct inpcb *); 785 int tcp_output(struct tcpcb *); 786 void tcp_state_change(struct tcpcb *, int); 787 void tcp_respond(struct tcpcb *, void *, 788 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 789 void tcp_tw_init(void); 790 #ifdef VIMAGE 791 void tcp_tw_destroy(void); 792 #endif 793 void tcp_tw_zone_change(void); 794 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *, 795 struct mbuf *, int); 796 void tcp_setpersist(struct tcpcb *); 797 #ifdef TCP_SIGNATURE 798 struct secasvar; 799 struct secasvar *tcp_get_sav(struct mbuf *, u_int); 800 int tcp_signature_do_compute(struct mbuf *, int, int, u_char *, 801 struct secasvar *); 802 int tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int); 803 int tcp_signature_verify(struct mbuf *, int, int, int, struct tcpopt *, 804 struct tcphdr *, u_int); 805 int tcp_signature_check(struct mbuf *m, int off0, int tlen, int optlen, 806 struct tcpopt *to, struct tcphdr *th, u_int tcpbflag); 807 #endif 808 void tcp_slowtimo(void); 809 struct tcptemp * 810 tcpip_maketemplate(struct inpcb *); 811 void tcpip_fillheaders(struct inpcb *, void *, void *); 812 void tcp_timer_activate(struct tcpcb *, uint32_t, u_int); 813 int tcp_timer_active(struct tcpcb *, uint32_t); 814 void tcp_timer_stop(struct tcpcb *, uint32_t); 815 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); 816 /* 817 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 818 */ 819 void tcp_hc_init(void); 820 #ifdef VIMAGE 821 void tcp_hc_destroy(void); 822 #endif 823 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 824 u_long tcp_hc_getmtu(struct in_conninfo *); 825 void tcp_hc_updatemtu(struct in_conninfo *, u_long); 826 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 827 828 extern struct pr_usrreqs tcp_usrreqs; 829 tcp_seq tcp_new_isn(struct tcpcb *); 830 831 int tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq); 832 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); 833 void tcp_clean_sackreport(struct tcpcb *tp); 834 void tcp_sack_adjust(struct tcpcb *tp); 835 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 836 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 837 void tcp_free_sackholes(struct tcpcb *tp); 838 int tcp_newreno(struct tcpcb *, struct tcphdr *); 839 u_long tcp_seq_subtract(u_long, u_long ); 840 int tcp_compute_pipe(struct tcpcb *); 841 842 static inline void 843 tcp_fields_to_host(struct tcphdr *th) 844 { 845 846 th->th_seq = ntohl(th->th_seq); 847 th->th_ack = ntohl(th->th_ack); 848 th->th_win = ntohs(th->th_win); 849 th->th_urp = ntohs(th->th_urp); 850 } 851 852 #ifdef TCP_SIGNATURE 853 static inline void 854 tcp_fields_to_net(struct tcphdr *th) 855 { 856 857 th->th_seq = htonl(th->th_seq); 858 th->th_ack = htonl(th->th_ack); 859 th->th_win = htons(th->th_win); 860 th->th_urp = htons(th->th_urp); 861 } 862 #endif 863 #endif /* _KERNEL */ 864 865 #endif /* _NETINET_TCP_VAR_H_ */ 866