1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1993, 1994, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 32 * $FreeBSD$ 33 */ 34 35 #ifndef _NETINET_TCP_VAR_H_ 36 #define _NETINET_TCP_VAR_H_ 37 38 #include <netinet/tcp.h> 39 #include <netinet/tcp_fsm.h> 40 41 #ifdef _KERNEL 42 #include <net/vnet.h> 43 #include <sys/mbuf.h> 44 #endif 45 46 #if defined(_KERNEL) || defined(_WANT_TCPCB) 47 /* TCP segment queue entry */ 48 struct tseg_qent { 49 LIST_ENTRY(tseg_qent) tqe_q; 50 int tqe_len; /* TCP segment data length */ 51 struct tcphdr *tqe_th; /* a pointer to tcp header */ 52 struct mbuf *tqe_m; /* mbuf contains packet */ 53 }; 54 LIST_HEAD(tsegqe_head, tseg_qent); 55 56 struct sackblk { 57 tcp_seq start; /* start seq no. of sack block */ 58 tcp_seq end; /* end seq no. */ 59 }; 60 61 struct sackhole { 62 tcp_seq start; /* start seq no. of hole */ 63 tcp_seq end; /* end seq no. */ 64 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ 65 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */ 66 }; 67 68 struct sackhint { 69 struct sackhole *nexthole; 70 int sack_bytes_rexmit; 71 tcp_seq last_sack_ack; /* Most recent/largest sacked ack */ 72 73 int ispare; /* explicit pad for 64bit alignment */ 74 int sacked_bytes; /* 75 * Total sacked bytes reported by the 76 * receiver via sack option 77 */ 78 uint32_t _pad1[1]; /* TBD */ 79 uint64_t _pad[1]; /* TBD */ 80 }; 81 82 STAILQ_HEAD(tcp_log_stailq, tcp_log_mem); 83 84 /* 85 * Tcp control block, one per tcp; fields: 86 * Organized for 64 byte cacheline efficiency based 87 * on common tcp_input/tcp_output processing. 88 */ 89 struct tcpcb { 90 /* Cache line 1 */ 91 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 92 struct tcp_function_block *t_fb;/* TCP function call block */ 93 void *t_fb_ptr; /* Pointer to t_fb specific data */ 94 uint32_t t_maxseg:24, /* maximum segment size */ 95 t_logstate:8; /* State of "black box" logging */ 96 uint32_t t_port:16, /* Tunneling (over udp) port */ 97 t_state:4, /* state of this connection */ 98 t_idle_reduce : 1, 99 t_delayed_ack: 7, /* Delayed ack variable */ 100 bits_spare : 4; 101 u_int t_flags; 102 tcp_seq snd_una; /* sent but unacknowledged */ 103 tcp_seq snd_max; /* highest sequence number sent; 104 * used to recognize retransmits 105 */ 106 tcp_seq snd_nxt; /* send next */ 107 tcp_seq snd_up; /* send urgent pointer */ 108 uint32_t snd_wnd; /* send window */ 109 uint32_t snd_cwnd; /* congestion-controlled window */ 110 uint32_t t_peakrate_thr; /* pre-calculated peak rate threshold */ 111 /* Cache line 2 */ 112 u_int32_t ts_offset; /* our timestamp offset */ 113 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ 114 int rcv_numsacks; /* # distinct sack blks present */ 115 u_int t_tsomax; /* TSO total burst length limit in bytes */ 116 u_int t_tsomaxsegcount; /* TSO maximum segment count */ 117 u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */ 118 tcp_seq rcv_nxt; /* receive next */ 119 tcp_seq rcv_adv; /* advertised window */ 120 uint32_t rcv_wnd; /* receive window */ 121 u_int t_flags2; /* More tcpcb flags storage */ 122 int t_srtt; /* smoothed round-trip time */ 123 int t_rttvar; /* variance in round-trip time */ 124 u_int32_t ts_recent; /* timestamp echo data */ 125 u_char snd_scale; /* window scaling for send window */ 126 u_char rcv_scale; /* window scaling for recv window */ 127 u_char snd_limited; /* segments limited transmitted */ 128 u_char request_r_scale; /* pending window scaling */ 129 tcp_seq last_ack_sent; 130 u_int t_rcvtime; /* inactivity time */ 131 /* Cache line 3 */ 132 tcp_seq rcv_up; /* receive urgent pointer */ 133 int t_segqlen; /* segment reassembly queue length */ 134 struct tsegqe_head t_segq; /* segment reassembly queue */ 135 struct mbuf *t_in_pkt; 136 struct mbuf *t_tail_pkt; 137 struct tcp_timer *t_timers; /* All the TCP timers in one struct */ 138 struct vnet *t_vnet; /* back pointer to parent vnet */ 139 uint32_t snd_ssthresh; /* snd_cwnd size threshold for 140 * for slow start exponential to 141 * linear switch 142 */ 143 tcp_seq snd_wl1; /* window update seg seq number */ 144 /* Cache line 4 */ 145 tcp_seq snd_wl2; /* window update seg ack number */ 146 147 tcp_seq irs; /* initial receive sequence number */ 148 tcp_seq iss; /* initial send sequence number */ 149 u_int t_acktime; 150 u_int ts_recent_age; /* when last updated */ 151 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 152 uint16_t cl4_spare; /* Spare to adjust CL 4 */ 153 char t_oobflags; /* have some */ 154 char t_iobc; /* input character */ 155 int t_rxtcur; /* current retransmit value (ticks) */ 156 157 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 158 u_int t_rtttime; /* RTT measurement start time */ 159 160 tcp_seq t_rtseq; /* sequence number being timed */ 161 u_int t_starttime; /* time connection was established */ 162 163 u_int t_pmtud_saved_maxseg; /* pre-blackhole MSS */ 164 u_int t_rttmin; /* minimum rtt allowed */ 165 166 u_int t_rttbest; /* best rtt we've seen */ 167 168 int t_softerror; /* possible error not yet reported */ 169 uint32_t max_sndwnd; /* largest window peer has offered */ 170 /* Cache line 5 */ 171 uint32_t snd_cwnd_prev; /* cwnd prior to retransmit */ 172 uint32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */ 173 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 174 int t_sndzerowin; /* zero-window updates sent */ 175 u_long t_rttupdated; /* number of times rtt sampled */ 176 int snd_numholes; /* number of holes seen by sender */ 177 u_int t_badrxtwin; /* window for retransmit recovery */ 178 TAILQ_HEAD(sackhole_head, sackhole) snd_holes; 179 /* SACK scoreboard (sorted) */ 180 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ 181 tcp_seq sack_newdata; /* New data xmitted in this recovery 182 episode starts at this seq number */ 183 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 184 struct sackhint sackhint; /* SACK scoreboard hint */ 185 int t_rttlow; /* smallest observerved RTT */ 186 int rfbuf_cnt; /* recv buffer autoscaling byte count */ 187 struct toedev *tod; /* toedev handling this connection */ 188 int t_sndrexmitpack; /* retransmit packets sent */ 189 int t_rcvoopack; /* out-of-order packets received */ 190 void *t_toe; /* TOE pcb pointer */ 191 struct cc_algo *cc_algo; /* congestion control algorithm */ 192 struct cc_var *ccv; /* congestion control specific vars */ 193 struct osd *osd; /* storage for Khelp module data */ 194 int t_bytes_acked; /* # bytes acked during current RTT */ 195 u_int t_maxunacktime; 196 u_int t_keepinit; /* time to establish connection */ 197 u_int t_keepidle; /* time before keepalive probes begin */ 198 u_int t_keepintvl; /* interval between keepalives */ 199 u_int t_keepcnt; /* number of keepalives before close */ 200 int t_dupacks; /* consecutive dup acks recd */ 201 int t_lognum; /* Number of log entries */ 202 struct tcp_log_stailq t_logs; /* Log buffer */ 203 struct tcp_log_id_node *t_lin; 204 struct tcp_log_id_bucket *t_lib; 205 const char *t_output_caller; /* Function that called tcp_output */ 206 uint32_t t_logsn; /* Log "serial number" */ 207 uint8_t t_tfo_client_cookie_len; /* TCP Fast Open client cookie length */ 208 unsigned int *t_tfo_pending; /* TCP Fast Open server pending counter */ 209 union { 210 uint8_t client[TCP_FASTOPEN_MAX_COOKIE_LEN]; 211 uint64_t server; 212 } t_tfo_cookie; /* TCP Fast Open cookie to send */ 213 #ifdef TCPPCAP 214 struct mbufq t_inpkts; /* List of saved input packets. */ 215 struct mbufq t_outpkts; /* List of saved output packets. */ 216 #endif 217 }; 218 #endif /* _KERNEL || _WANT_TCPCB */ 219 220 #ifdef _KERNEL 221 struct tcptemp { 222 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 223 struct tcphdr tt_t; 224 }; 225 226 /* 227 * TODO: We yet need to brave plowing in 228 * to tcp_input() and the pru_usrreq() block. 229 * Right now these go to the old standards which 230 * are somewhat ok, but in the long term may 231 * need to be changed. If we do tackle tcp_input() 232 * then we need to get rid of the tcp_do_segment() 233 * function below. 234 */ 235 /* Flags for tcp functions */ 236 #define TCP_FUNC_BEING_REMOVED 0x01 /* Can no longer be referenced */ 237 238 /* 239 * If defining the optional tcp_timers, in the 240 * tfb_tcp_timer_stop call you must use the 241 * callout_async_drain() function with the 242 * tcp_timer_discard callback. You should check 243 * the return of callout_async_drain() and if 0 244 * increment tt_draincnt. Since the timer sub-system 245 * does not know your callbacks you must provide a 246 * stop_all function that loops through and calls 247 * tcp_timer_stop() with each of your defined timers. 248 * Adding a tfb_tcp_handoff_ok function allows the socket 249 * option to change stacks to query you even if the 250 * connection is in a later stage. You return 0 to 251 * say you can take over and run your stack, you return 252 * non-zero (an error number) to say no you can't. 253 * If the function is undefined you can only change 254 * in the early states (before connect or listen). 255 * tfb_tcp_fb_fini is changed to add a flag to tell 256 * the old stack if the tcb is being destroyed or 257 * not. A one in the flag means the TCB is being 258 * destroyed, a zero indicates its transitioning to 259 * another stack (via socket option). 260 */ 261 struct tcp_function_block { 262 char tfb_tcp_block_name[TCP_FUNCTION_NAME_LEN_MAX]; 263 int (*tfb_tcp_output)(struct tcpcb *); 264 int (*tfb_tcp_output_wtime)(struct tcpcb *, const struct timeval *); 265 void (*tfb_tcp_do_segment)(struct mbuf *, struct tcphdr *, 266 struct socket *, struct tcpcb *, 267 int, int, uint8_t, 268 int); 269 void (*tfb_tcp_hpts_do_segment)(struct mbuf *, struct tcphdr *, 270 struct socket *, struct tcpcb *, 271 int, int, uint8_t, 272 int, int, struct timeval *); 273 int (*tfb_tcp_ctloutput)(struct socket *so, struct sockopt *sopt, 274 struct inpcb *inp, struct tcpcb *tp); 275 /* Optional memory allocation/free routine */ 276 int (*tfb_tcp_fb_init)(struct tcpcb *); 277 void (*tfb_tcp_fb_fini)(struct tcpcb *, int); 278 /* Optional timers, must define all if you define one */ 279 int (*tfb_tcp_timer_stop_all)(struct tcpcb *); 280 void (*tfb_tcp_timer_activate)(struct tcpcb *, 281 uint32_t, u_int); 282 int (*tfb_tcp_timer_active)(struct tcpcb *, uint32_t); 283 void (*tfb_tcp_timer_stop)(struct tcpcb *, uint32_t); 284 void (*tfb_tcp_rexmit_tmr)(struct tcpcb *); 285 int (*tfb_tcp_handoff_ok)(struct tcpcb *); 286 void (*tfb_tcp_mtu_chg)(struct tcpcb *); 287 volatile uint32_t tfb_refcnt; 288 uint32_t tfb_flags; 289 uint8_t tfb_id; 290 }; 291 292 struct tcp_function { 293 TAILQ_ENTRY(tcp_function) tf_next; 294 char tf_name[TCP_FUNCTION_NAME_LEN_MAX]; 295 struct tcp_function_block *tf_fb; 296 }; 297 298 TAILQ_HEAD(tcp_funchead, tcp_function); 299 #endif /* _KERNEL */ 300 301 /* 302 * Flags and utility macros for the t_flags field. 303 */ 304 #define TF_ACKNOW 0x000001 /* ack peer immediately */ 305 #define TF_DELACK 0x000002 /* ack, but try to delay it */ 306 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 307 #define TF_NOOPT 0x000008 /* don't use tcp options */ 308 #define TF_SENTFIN 0x000010 /* have sent FIN */ 309 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 310 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 311 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 312 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 313 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 314 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 315 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 316 #define TF_NOPUSH 0x001000 /* don't push */ 317 #define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */ 318 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 319 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 320 #define TF_LASTIDLE 0x040000 /* connection was previously idle */ 321 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 322 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 323 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 324 #define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 325 #define TF_FORCEDATA 0x800000 /* force out a byte */ 326 #define TF_TSO 0x1000000 /* TSO enabled on this connection */ 327 #define TF_TOE 0x2000000 /* this connection is offloaded */ 328 #define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */ 329 #define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */ 330 #define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */ 331 #define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */ 332 #define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */ 333 #define TF_FASTOPEN 0x80000000 /* TCP Fast Open indication */ 334 335 #define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY) 336 #define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY 337 #define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY 338 339 #define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY) 340 #define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY 341 #define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY 342 343 #define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY)) 344 #define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY) 345 #define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY) 346 347 #if defined(_KERNEL) && !defined(TCP_RFC7413) 348 #define IS_FASTOPEN(t_flags) (false) 349 #else 350 #define IS_FASTOPEN(t_flags) (t_flags & TF_FASTOPEN) 351 #endif 352 353 #define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una) 354 355 /* 356 * Flags for the t_oobflags field. 357 */ 358 #define TCPOOB_HAVEDATA 0x01 359 #define TCPOOB_HADDATA 0x02 360 361 /* 362 * Flags for the extended TCP flags field, t_flags2 363 */ 364 #define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */ 365 #define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */ 366 #define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */ 367 #define TF2_LOG_AUTO 0x00000008 /* Session is auto-logging. */ 368 #define TF2_DROP_AF_DATA 0x00000010 /* Drop after all data ack'd */ 369 370 /* 371 * Structure to hold TCP options that are only used during segment 372 * processing (in tcp_input), but not held in the tcpcb. 373 * It's basically used to reduce the number of parameters 374 * to tcp_dooptions and tcp_addoptions. 375 * The binary order of the to_flags is relevant for packing of the 376 * options in tcp_addoptions. 377 */ 378 struct tcpopt { 379 u_int32_t to_flags; /* which options are present */ 380 #define TOF_MSS 0x0001 /* maximum segment size */ 381 #define TOF_SCALE 0x0002 /* window scaling */ 382 #define TOF_SACKPERM 0x0004 /* SACK permitted */ 383 #define TOF_TS 0x0010 /* timestamp */ 384 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ 385 #define TOF_SACK 0x0080 /* Peer sent SACK option */ 386 #define TOF_FASTOPEN 0x0100 /* TCP Fast Open (TFO) cookie */ 387 #define TOF_MAXOPT 0x0200 388 u_int32_t to_tsval; /* new timestamp */ 389 u_int32_t to_tsecr; /* reflected timestamp */ 390 u_char *to_sacks; /* pointer to the first SACK blocks */ 391 u_char *to_signature; /* pointer to the TCP-MD5 signature */ 392 u_int8_t *to_tfo_cookie; /* pointer to the TFO cookie */ 393 u_int16_t to_mss; /* maximum segment size */ 394 u_int8_t to_wscale; /* window scaling */ 395 u_int8_t to_nsacks; /* number of SACK blocks */ 396 u_int8_t to_tfo_len; /* TFO cookie length */ 397 u_int32_t to_spare; /* UTO */ 398 }; 399 400 /* 401 * Flags for tcp_dooptions. 402 */ 403 #define TO_SYN 0x01 /* parse SYN-only options */ 404 405 struct hc_metrics_lite { /* must stay in sync with hc_metrics */ 406 uint32_t rmx_mtu; /* MTU for this path */ 407 uint32_t rmx_ssthresh; /* outbound gateway buffer limit */ 408 uint32_t rmx_rtt; /* estimated round trip time */ 409 uint32_t rmx_rttvar; /* estimated rtt variance */ 410 uint32_t rmx_cwnd; /* congestion window */ 411 uint32_t rmx_sendpipe; /* outbound delay-bandwidth product */ 412 uint32_t rmx_recvpipe; /* inbound delay-bandwidth product */ 413 }; 414 415 /* 416 * Used by tcp_maxmtu() to communicate interface specific features 417 * and limits at the time of connection setup. 418 */ 419 struct tcp_ifcap { 420 int ifcap; 421 u_int tsomax; 422 u_int tsomaxsegcount; 423 u_int tsomaxsegsize; 424 }; 425 426 #ifndef _NETINET_IN_PCB_H_ 427 struct in_conninfo; 428 #endif /* _NETINET_IN_PCB_H_ */ 429 430 struct tcptw { 431 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 432 tcp_seq snd_nxt; 433 tcp_seq rcv_nxt; 434 tcp_seq iss; 435 tcp_seq irs; 436 u_short last_win; /* cached window value */ 437 short tw_so_options; /* copy of so_options */ 438 struct ucred *tw_cred; /* user credentials */ 439 u_int32_t t_recent; 440 u_int32_t ts_offset; /* our timestamp offset */ 441 u_int t_starttime; 442 int tw_time; 443 TAILQ_ENTRY(tcptw) tw_2msl; 444 void *tw_pspare; /* TCP_SIGNATURE */ 445 u_int *tw_spare; /* TCP_SIGNATURE */ 446 }; 447 448 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 449 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 450 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 451 452 /* 453 * The smoothed round-trip time and estimated variance 454 * are stored as fixed point numbers scaled by the values below. 455 * For convenience, these scales are also used in smoothing the average 456 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 457 * With these scales, srtt has 3 bits to the right of the binary point, 458 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 459 * binary point, and is smoothed with an ALPHA of 0.75. 460 */ 461 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 462 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 463 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 464 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 465 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 466 467 /* 468 * The initial retransmission should happen at rtt + 4 * rttvar. 469 * Because of the way we do the smoothing, srtt and rttvar 470 * will each average +1/2 tick of bias. When we compute 471 * the retransmit timer, we want 1/2 tick of rounding and 472 * 1 extra tick because of +-1/2 tick uncertainty in the 473 * firing of the timer. The bias will give us exactly the 474 * 1.5 tick we need. But, because the bias is 475 * statistical, we have to test that we don't drop below 476 * the minimum feasible timer (which is 2 ticks). 477 * This version of the macro adapted from a paper by Lawrence 478 * Brakmo and Larry Peterson which outlines a problem caused 479 * by insufficient precision in the original implementation, 480 * which results in inappropriately large RTO values for very 481 * fast networks. 482 */ 483 #define TCP_REXMTVAL(tp) \ 484 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 485 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 486 487 /* 488 * TCP statistics. 489 * Many of these should be kept per connection, 490 * but that's inconvenient at the moment. 491 */ 492 struct tcpstat { 493 uint64_t tcps_connattempt; /* connections initiated */ 494 uint64_t tcps_accepts; /* connections accepted */ 495 uint64_t tcps_connects; /* connections established */ 496 uint64_t tcps_drops; /* connections dropped */ 497 uint64_t tcps_conndrops; /* embryonic connections dropped */ 498 uint64_t tcps_minmssdrops; /* average minmss too low drops */ 499 uint64_t tcps_closed; /* conn. closed (includes drops) */ 500 uint64_t tcps_segstimed; /* segs where we tried to get rtt */ 501 uint64_t tcps_rttupdated; /* times we succeeded */ 502 uint64_t tcps_delack; /* delayed acks sent */ 503 uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 504 uint64_t tcps_rexmttimeo; /* retransmit timeouts */ 505 uint64_t tcps_persisttimeo; /* persist timeouts */ 506 uint64_t tcps_keeptimeo; /* keepalive timeouts */ 507 uint64_t tcps_keepprobe; /* keepalive probes sent */ 508 uint64_t tcps_keepdrops; /* connections dropped in keepalive */ 509 510 uint64_t tcps_sndtotal; /* total packets sent */ 511 uint64_t tcps_sndpack; /* data packets sent */ 512 uint64_t tcps_sndbyte; /* data bytes sent */ 513 uint64_t tcps_sndrexmitpack; /* data packets retransmitted */ 514 uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 515 uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 516 uint64_t tcps_sndacks; /* ack-only packets sent */ 517 uint64_t tcps_sndprobe; /* window probes sent */ 518 uint64_t tcps_sndurg; /* packets sent with URG only */ 519 uint64_t tcps_sndwinup; /* window update-only packets sent */ 520 uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 521 522 uint64_t tcps_rcvtotal; /* total packets received */ 523 uint64_t tcps_rcvpack; /* packets received in sequence */ 524 uint64_t tcps_rcvbyte; /* bytes received in sequence */ 525 uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */ 526 uint64_t tcps_rcvbadoff; /* packets received with bad offset */ 527 uint64_t tcps_rcvreassfull; /* packets dropped for no reass space */ 528 uint64_t tcps_rcvshort; /* packets received too short */ 529 uint64_t tcps_rcvduppack; /* duplicate-only packets received */ 530 uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 531 uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */ 532 uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 533 uint64_t tcps_rcvoopack; /* out-of-order packets received */ 534 uint64_t tcps_rcvoobyte; /* out-of-order bytes received */ 535 uint64_t tcps_rcvpackafterwin; /* packets with data after window */ 536 uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 537 uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */ 538 uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */ 539 uint64_t tcps_rcvdupack; /* rcvd duplicate acks */ 540 uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 541 uint64_t tcps_rcvackpack; /* rcvd ack packets */ 542 uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 543 uint64_t tcps_rcvwinupd; /* rcvd window update packets */ 544 uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */ 545 uint64_t tcps_predack; /* times hdr predict ok for acks */ 546 uint64_t tcps_preddat; /* times hdr predict ok for data pkts */ 547 uint64_t tcps_pcbcachemiss; 548 uint64_t tcps_cachedrtt; /* times cached RTT in route updated */ 549 uint64_t tcps_cachedrttvar; /* times cached rttvar updated */ 550 uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */ 551 uint64_t tcps_usedrtt; /* times RTT initialized from route */ 552 uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */ 553 uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/ 554 uint64_t tcps_persistdrop; /* timeout in persist state */ 555 uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 556 uint64_t tcps_mturesent; /* resends due to MTU discovery */ 557 uint64_t tcps_listendrop; /* listen queue overflows */ 558 uint64_t tcps_badrst; /* ignored RSTs in the window */ 559 560 uint64_t tcps_sc_added; /* entry added to syncache */ 561 uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */ 562 uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */ 563 uint64_t tcps_sc_dropped; /* could not reply to packet */ 564 uint64_t tcps_sc_completed; /* successful extraction of entry */ 565 uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */ 566 uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */ 567 uint64_t tcps_sc_reset; /* RST removed entry from syncache */ 568 uint64_t tcps_sc_stale; /* timed out or listen socket gone */ 569 uint64_t tcps_sc_aborted; /* syncache entry aborted */ 570 uint64_t tcps_sc_badack; /* removed due to bad ACK */ 571 uint64_t tcps_sc_unreach; /* ICMP unreachable received */ 572 uint64_t tcps_sc_zonefail; /* zalloc() failed */ 573 uint64_t tcps_sc_sendcookie; /* SYN cookie sent */ 574 uint64_t tcps_sc_recvcookie; /* SYN cookie received */ 575 576 uint64_t tcps_hc_added; /* entry added to hostcache */ 577 uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */ 578 579 uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ 580 581 /* SACK related stats */ 582 uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */ 583 uint64_t tcps_sack_rexmits; /* SACK rexmit segments */ 584 uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 585 uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 586 uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */ 587 uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */ 588 589 /* ECN related stats */ 590 uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */ 591 uint64_t tcps_ecn_ect0; /* ECN Capable Transport */ 592 uint64_t tcps_ecn_ect1; /* ECN Capable Transport */ 593 uint64_t tcps_ecn_shs; /* ECN successful handshakes */ 594 uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */ 595 596 /* TCP_SIGNATURE related stats */ 597 uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */ 598 uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */ 599 uint64_t tcps_sig_err_buildsig; /* Failed to make signature */ 600 uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */ 601 uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */ 602 603 /* Path MTU Discovery Black Hole Detection related stats */ 604 uint64_t tcps_pmtud_blackhole_activated; /* Black Hole Count */ 605 uint64_t tcps_pmtud_blackhole_activated_min_mss; /* BH at min MSS Count */ 606 uint64_t tcps_pmtud_blackhole_failed; /* Black Hole Failure Count */ 607 608 uint64_t _pad[12]; /* 6 UTO, 6 TBD */ 609 }; 610 611 #define tcps_rcvmemdrop tcps_rcvreassfull /* compat */ 612 613 #ifdef _KERNEL 614 #define TI_UNLOCKED 1 615 #define TI_RLOCKED 2 616 #include <sys/counter.h> 617 618 VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */ 619 /* 620 * In-kernel consumers can use these accessor macros directly to update 621 * stats. 622 */ 623 #define TCPSTAT_ADD(name, val) \ 624 VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val)) 625 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1) 626 627 /* 628 * Kernel module consumers must use this accessor macro. 629 */ 630 void kmod_tcpstat_inc(int statnum); 631 #define KMOD_TCPSTAT_INC(name) \ 632 kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(uint64_t)) 633 634 /* 635 * Running TCP connection count by state. 636 */ 637 VNET_DECLARE(counter_u64_t, tcps_states[TCP_NSTATES]); 638 #define V_tcps_states VNET(tcps_states) 639 #define TCPSTATES_INC(state) counter_u64_add(V_tcps_states[state], 1) 640 #define TCPSTATES_DEC(state) counter_u64_add(V_tcps_states[state], -1) 641 642 /* 643 * TCP specific helper hook point identifiers. 644 */ 645 #define HHOOK_TCP_EST_IN 0 646 #define HHOOK_TCP_EST_OUT 1 647 #define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT 648 649 struct tcp_hhook_data { 650 struct tcpcb *tp; 651 struct tcphdr *th; 652 struct tcpopt *to; 653 uint32_t len; 654 int tso; 655 tcp_seq curack; 656 }; 657 #ifdef TCP_HHOOK 658 void hhook_run_tcp_est_out(struct tcpcb *tp, 659 struct tcphdr *th, struct tcpopt *to, 660 uint32_t len, int tso); 661 #endif 662 #endif 663 664 /* 665 * TCB structure exported to user-land via sysctl(3). 666 * 667 * Fields prefixed with "xt_" are unique to the export structure, and fields 668 * with "t_" or other prefixes match corresponding fields of 'struct tcpcb'. 669 * 670 * Legend: 671 * (s) - used by userland utilities in src 672 * (p) - used by utilities in ports 673 * (3) - is known to be used by third party software not in ports 674 * (n) - no known usage 675 * 676 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 677 * included. Not all of our clients do. 678 */ 679 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 680 struct xtcpcb { 681 size_t xt_len; /* length of this structure */ 682 struct xinpcb xt_inp; 683 char xt_stack[TCP_FUNCTION_NAME_LEN_MAX]; /* (s) */ 684 char xt_logid[TCP_LOG_ID_LEN]; /* (s) */ 685 int64_t spare64[8]; 686 int32_t t_state; /* (s,p) */ 687 uint32_t t_flags; /* (s,p) */ 688 int32_t t_sndzerowin; /* (s) */ 689 int32_t t_sndrexmitpack; /* (s) */ 690 int32_t t_rcvoopack; /* (s) */ 691 int32_t t_rcvtime; /* (s) */ 692 int32_t tt_rexmt; /* (s) */ 693 int32_t tt_persist; /* (s) */ 694 int32_t tt_keep; /* (s) */ 695 int32_t tt_2msl; /* (s) */ 696 int32_t tt_delack; /* (s) */ 697 int32_t t_logstate; /* (3) */ 698 int32_t spare32[32]; 699 } __aligned(8); 700 701 #ifdef _KERNEL 702 void tcp_inptoxtp(const struct inpcb *, struct xtcpcb *); 703 #endif 704 #endif 705 706 /* 707 * TCP function information (name-to-id mapping, aliases, and refcnt) 708 * exported to user-land via sysctl(3). 709 */ 710 struct tcp_function_info { 711 uint32_t tfi_refcnt; 712 uint8_t tfi_id; 713 char tfi_name[TCP_FUNCTION_NAME_LEN_MAX]; 714 char tfi_alias[TCP_FUNCTION_NAME_LEN_MAX]; 715 }; 716 717 /* 718 * Identifiers for TCP sysctl nodes 719 */ 720 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 721 #define TCPCTL_MSSDFLT 3 /* MSS default */ 722 #define TCPCTL_STATS 4 /* statistics */ 723 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 724 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 725 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 726 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 727 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 728 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 729 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 730 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 731 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 732 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 733 #define TCPCTL_DROP 15 /* drop tcp connection */ 734 #define TCPCTL_STATES 16 /* connection counts by TCP state */ 735 736 #ifdef _KERNEL 737 #ifdef SYSCTL_DECL 738 SYSCTL_DECL(_net_inet_tcp); 739 SYSCTL_DECL(_net_inet_tcp_sack); 740 MALLOC_DECLARE(M_TCPLOG); 741 #endif 742 743 extern int tcp_log_in_vain; 744 745 /* 746 * Global TCP tunables shared between different stacks. 747 * Please keep the list sorted. 748 */ 749 VNET_DECLARE(int, drop_synfin); 750 VNET_DECLARE(int, path_mtu_discovery); 751 VNET_DECLARE(int, tcp_abc_l_var); 752 VNET_DECLARE(int, tcp_autorcvbuf_inc); 753 VNET_DECLARE(int, tcp_autorcvbuf_max); 754 VNET_DECLARE(int, tcp_autosndbuf_inc); 755 VNET_DECLARE(int, tcp_autosndbuf_max); 756 VNET_DECLARE(int, tcp_delack_enabled); 757 VNET_DECLARE(int, tcp_do_autorcvbuf); 758 VNET_DECLARE(int, tcp_do_autosndbuf); 759 VNET_DECLARE(int, tcp_do_ecn); 760 VNET_DECLARE(int, tcp_do_rfc1323); 761 VNET_DECLARE(int, tcp_do_rfc3042); 762 VNET_DECLARE(int, tcp_do_rfc3390); 763 VNET_DECLARE(int, tcp_do_rfc3465); 764 VNET_DECLARE(int, tcp_do_rfc6675_pipe); 765 VNET_DECLARE(int, tcp_do_sack); 766 VNET_DECLARE(int, tcp_do_tso); 767 VNET_DECLARE(int, tcp_ecn_maxretries); 768 VNET_DECLARE(int, tcp_initcwnd_segments); 769 VNET_DECLARE(int, tcp_insecure_rst); 770 VNET_DECLARE(int, tcp_insecure_syn); 771 VNET_DECLARE(int, tcp_minmss); 772 VNET_DECLARE(int, tcp_mssdflt); 773 VNET_DECLARE(int, tcp_recvspace); 774 VNET_DECLARE(int, tcp_sack_globalholes); 775 VNET_DECLARE(int, tcp_sack_globalmaxholes); 776 VNET_DECLARE(int, tcp_sack_maxholes); 777 VNET_DECLARE(int, tcp_sc_rst_sock_fail); 778 VNET_DECLARE(int, tcp_sendspace); 779 VNET_DECLARE(struct inpcbhead, tcb); 780 VNET_DECLARE(struct inpcbinfo, tcbinfo); 781 782 #define V_drop_synfin VNET(drop_synfin) 783 #define V_path_mtu_discovery VNET(path_mtu_discovery) 784 #define V_tcb VNET(tcb) 785 #define V_tcbinfo VNET(tcbinfo) 786 #define V_tcp_abc_l_var VNET(tcp_abc_l_var) 787 #define V_tcp_autorcvbuf_inc VNET(tcp_autorcvbuf_inc) 788 #define V_tcp_autorcvbuf_max VNET(tcp_autorcvbuf_max) 789 #define V_tcp_autosndbuf_inc VNET(tcp_autosndbuf_inc) 790 #define V_tcp_autosndbuf_max VNET(tcp_autosndbuf_max) 791 #define V_tcp_delack_enabled VNET(tcp_delack_enabled) 792 #define V_tcp_do_autorcvbuf VNET(tcp_do_autorcvbuf) 793 #define V_tcp_do_autosndbuf VNET(tcp_do_autosndbuf) 794 #define V_tcp_do_ecn VNET(tcp_do_ecn) 795 #define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323) 796 #define V_tcp_do_rfc3042 VNET(tcp_do_rfc3042) 797 #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) 798 #define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465) 799 #define V_tcp_do_rfc6675_pipe VNET(tcp_do_rfc6675_pipe) 800 #define V_tcp_do_sack VNET(tcp_do_sack) 801 #define V_tcp_do_tso VNET(tcp_do_tso) 802 #define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries) 803 #define V_tcp_initcwnd_segments VNET(tcp_initcwnd_segments) 804 #define V_tcp_insecure_rst VNET(tcp_insecure_rst) 805 #define V_tcp_insecure_syn VNET(tcp_insecure_syn) 806 #define V_tcp_minmss VNET(tcp_minmss) 807 #define V_tcp_mssdflt VNET(tcp_mssdflt) 808 #define V_tcp_recvspace VNET(tcp_recvspace) 809 #define V_tcp_sack_globalholes VNET(tcp_sack_globalholes) 810 #define V_tcp_sack_globalmaxholes VNET(tcp_sack_globalmaxholes) 811 #define V_tcp_sack_maxholes VNET(tcp_sack_maxholes) 812 #define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail) 813 #define V_tcp_sendspace VNET(tcp_sendspace) 814 #define V_tcp_udp_tunneling_overhead VNET(tcp_udp_tunneling_overhead) 815 #define V_tcp_udp_tunneling_port VNET(tcp_udp_tunneling_port) 816 817 818 #ifdef TCP_HHOOK 819 VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]); 820 #define V_tcp_hhh VNET(tcp_hhh) 821 #endif 822 823 int tcp_addoptions(struct tcpopt *, u_char *); 824 int tcp_ccalgounload(struct cc_algo *unload_algo); 825 struct tcpcb * 826 tcp_close(struct tcpcb *); 827 void tcp_discardcb(struct tcpcb *); 828 void tcp_twstart(struct tcpcb *); 829 void tcp_twclose(struct tcptw *, int); 830 void tcp_ctlinput(int, struct sockaddr *, void *); 831 int tcp_ctloutput(struct socket *, struct sockopt *); 832 struct tcpcb * 833 tcp_drop(struct tcpcb *, int); 834 void tcp_drain(void); 835 void tcp_init(void); 836 void tcp_fini(void *); 837 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *, 838 const void *); 839 char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *, 840 const void *); 841 int tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *); 842 void tcp_reass_global_init(void); 843 void tcp_reass_flush(struct tcpcb *); 844 void tcp_dooptions(struct tcpopt *, u_char *, int, int); 845 void tcp_dropwithreset(struct mbuf *, struct tcphdr *, 846 struct tcpcb *, int, int); 847 void tcp_pulloutofband(struct socket *, 848 struct tcphdr *, struct mbuf *, int); 849 void tcp_xmit_timer(struct tcpcb *, int); 850 void tcp_newreno_partial_ack(struct tcpcb *, struct tcphdr *); 851 void cc_ack_received(struct tcpcb *tp, struct tcphdr *th, 852 uint16_t nsegs, uint16_t type); 853 void cc_conn_init(struct tcpcb *tp); 854 void cc_post_recovery(struct tcpcb *tp, struct tcphdr *th); 855 void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type); 856 #ifdef TCP_HHOOK 857 void hhook_run_tcp_est_in(struct tcpcb *tp, 858 struct tcphdr *th, struct tcpopt *to); 859 #endif 860 861 int tcp_input(struct mbuf **, int *, int); 862 int tcp_autorcvbuf(struct mbuf *, struct tcphdr *, struct socket *, 863 struct tcpcb *, int); 864 void tcp_do_segment(struct mbuf *, struct tcphdr *, 865 struct socket *, struct tcpcb *, int, int, uint8_t, 866 int); 867 868 int register_tcp_functions(struct tcp_function_block *blk, int wait); 869 int register_tcp_functions_as_names(struct tcp_function_block *blk, 870 int wait, const char *names[], int *num_names); 871 int register_tcp_functions_as_name(struct tcp_function_block *blk, 872 const char *name, int wait); 873 int deregister_tcp_functions(struct tcp_function_block *blk, bool quiesce, 874 bool force); 875 struct tcp_function_block *find_and_ref_tcp_functions(struct tcp_function_set *fs); 876 void tcp_switch_back_to_default(struct tcpcb *tp); 877 struct tcp_function_block * 878 find_and_ref_tcp_fb(struct tcp_function_block *fs); 879 int tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp); 880 881 uint32_t tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *); 882 uint32_t tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *); 883 u_int tcp_maxseg(const struct tcpcb *); 884 void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *, 885 struct tcp_ifcap *); 886 void tcp_mss(struct tcpcb *, int); 887 int tcp_mssopt(struct in_conninfo *); 888 struct inpcb * 889 tcp_drop_syn_sent(struct inpcb *, int); 890 struct tcpcb * 891 tcp_newtcpcb(struct inpcb *); 892 int tcp_output(struct tcpcb *); 893 void tcp_state_change(struct tcpcb *, int); 894 void tcp_respond(struct tcpcb *, void *, 895 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 896 void tcp_tw_init(void); 897 #ifdef VIMAGE 898 void tcp_tw_destroy(void); 899 #endif 900 void tcp_tw_zone_change(void); 901 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *, 902 struct mbuf *, int); 903 void tcp_setpersist(struct tcpcb *); 904 void tcp_slowtimo(void); 905 struct tcptemp * 906 tcpip_maketemplate(struct inpcb *); 907 void tcpip_fillheaders(struct inpcb *, void *, void *); 908 void tcp_timer_activate(struct tcpcb *, uint32_t, u_int); 909 int tcp_timer_suspend(struct tcpcb *, uint32_t); 910 void tcp_timers_unsuspend(struct tcpcb *, uint32_t); 911 int tcp_timer_active(struct tcpcb *, uint32_t); 912 void tcp_timer_stop(struct tcpcb *, uint32_t); 913 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); 914 int inp_to_cpuid(struct inpcb *inp); 915 /* 916 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 917 */ 918 void tcp_hc_init(void); 919 #ifdef VIMAGE 920 void tcp_hc_destroy(void); 921 #endif 922 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 923 uint32_t tcp_hc_getmtu(struct in_conninfo *); 924 void tcp_hc_updatemtu(struct in_conninfo *, uint32_t); 925 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 926 927 extern struct pr_usrreqs tcp_usrreqs; 928 tcp_seq tcp_new_isn(struct tcpcb *); 929 930 int tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq); 931 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); 932 void tcp_clean_sackreport(struct tcpcb *tp); 933 void tcp_sack_adjust(struct tcpcb *tp); 934 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 935 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 936 void tcp_free_sackholes(struct tcpcb *tp); 937 int tcp_newreno(struct tcpcb *, struct tcphdr *); 938 int tcp_compute_pipe(struct tcpcb *); 939 void tcp_sndbuf_autoscale(struct tcpcb *, struct socket *, uint32_t); 940 struct mbuf * 941 tcp_m_copym(struct mbuf *m, int32_t off0, int32_t *plen, 942 int32_t seglimit, int32_t segsize, struct sockbuf *sb); 943 944 945 static inline void 946 tcp_fields_to_host(struct tcphdr *th) 947 { 948 949 th->th_seq = ntohl(th->th_seq); 950 th->th_ack = ntohl(th->th_ack); 951 th->th_win = ntohs(th->th_win); 952 th->th_urp = ntohs(th->th_urp); 953 } 954 955 static inline void 956 tcp_fields_to_net(struct tcphdr *th) 957 { 958 959 th->th_seq = htonl(th->th_seq); 960 th->th_ack = htonl(th->th_ack); 961 th->th_win = htons(th->th_win); 962 th->th_urp = htons(th->th_urp); 963 } 964 #endif /* _KERNEL */ 965 966 #endif /* _NETINET_TCP_VAR_H_ */ 967