1 /* $OpenBSD: tcp_usrreq.c,v 1.219 2023/05/23 09:16:16 jan Exp $ */ 2 /* $NetBSD: tcp_usrreq.c,v 1.20 1996/02/13 23:44:16 christos Exp $ */ 3 4 /* 5 * Copyright (c) 1982, 1986, 1988, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)COPYRIGHT 1.1 (NRL) 17 January 1995 33 * 34 * NRL grants permission for redistribution and use in source and binary 35 * forms, with or without modification, of the software and documentation 36 * created at NRL provided that the following conditions are met: 37 * 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 3. All advertising materials mentioning features or use of this software 44 * must display the following acknowledgements: 45 * This product includes software developed by the University of 46 * California, Berkeley and its contributors. 47 * This product includes software developed at the Information 48 * Technology Division, US Naval Research Laboratory. 49 * 4. Neither the name of the NRL nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL AND CONTRIBUTORS ``AS 54 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 55 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 56 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NRL OR 57 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 58 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 59 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 60 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 61 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 62 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 63 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 64 * 65 * The views and conclusions contained in the software and documentation 66 * are those of the authors and should not be interpreted as representing 67 * official policies, either expressed or implied, of the US Naval 68 * Research Laboratory (NRL). 69 */ 70 71 #include <sys/param.h> 72 #include <sys/systm.h> 73 #include <sys/mbuf.h> 74 #include <sys/socket.h> 75 #include <sys/socketvar.h> 76 #include <sys/protosw.h> 77 #include <sys/stat.h> 78 #include <sys/sysctl.h> 79 #include <sys/domain.h> 80 #include <sys/kernel.h> 81 #include <sys/pool.h> 82 #include <sys/proc.h> 83 84 #include <net/if.h> 85 #include <net/if_var.h> 86 #include <net/route.h> 87 88 #include <netinet/in.h> 89 #include <netinet/in_var.h> 90 #include <netinet/ip.h> 91 #include <netinet/in_pcb.h> 92 #include <netinet/ip_var.h> 93 #include <netinet/tcp.h> 94 #include <netinet/tcp_fsm.h> 95 #include <netinet/tcp_seq.h> 96 #include <netinet/tcp_timer.h> 97 #include <netinet/tcp_var.h> 98 #include <netinet/tcp_debug.h> 99 100 #ifdef INET6 101 #include <netinet6/in6_var.h> 102 #endif 103 104 #ifndef TCP_SENDSPACE 105 #define TCP_SENDSPACE 1024*16 106 #endif 107 u_int tcp_sendspace = TCP_SENDSPACE; 108 #ifndef TCP_RECVSPACE 109 #define TCP_RECVSPACE 1024*16 110 #endif 111 u_int tcp_recvspace = TCP_RECVSPACE; 112 u_int tcp_autorcvbuf_inc = 16 * 1024; 113 114 const struct pr_usrreqs tcp_usrreqs = { 115 .pru_attach = tcp_attach, 116 .pru_detach = tcp_detach, 117 .pru_bind = tcp_bind, 118 .pru_listen = tcp_listen, 119 .pru_connect = tcp_connect, 120 .pru_accept = tcp_accept, 121 .pru_disconnect = tcp_disconnect, 122 .pru_shutdown = tcp_shutdown, 123 .pru_rcvd = tcp_rcvd, 124 .pru_send = tcp_send, 125 .pru_abort = tcp_abort, 126 .pru_sense = tcp_sense, 127 .pru_rcvoob = tcp_rcvoob, 128 .pru_sendoob = tcp_sendoob, 129 .pru_control = in_control, 130 .pru_sockaddr = tcp_sockaddr, 131 .pru_peeraddr = tcp_peeraddr, 132 }; 133 134 #ifdef INET6 135 const struct pr_usrreqs tcp6_usrreqs = { 136 .pru_attach = tcp_attach, 137 .pru_detach = tcp_detach, 138 .pru_bind = tcp_bind, 139 .pru_listen = tcp_listen, 140 .pru_connect = tcp_connect, 141 .pru_accept = tcp_accept, 142 .pru_disconnect = tcp_disconnect, 143 .pru_shutdown = tcp_shutdown, 144 .pru_rcvd = tcp_rcvd, 145 .pru_send = tcp_send, 146 .pru_abort = tcp_abort, 147 .pru_sense = tcp_sense, 148 .pru_rcvoob = tcp_rcvoob, 149 .pru_sendoob = tcp_sendoob, 150 .pru_control = in6_control, 151 .pru_sockaddr = tcp_sockaddr, 152 .pru_peeraddr = tcp_peeraddr, 153 }; 154 #endif 155 156 const struct sysctl_bounded_args tcpctl_vars[] = { 157 { TCPCTL_RFC1323, &tcp_do_rfc1323, 0, 1 }, 158 { TCPCTL_SACK, &tcp_do_sack, 0, 1 }, 159 { TCPCTL_MSSDFLT, &tcp_mssdflt, TCP_MSS, 65535 }, 160 { TCPCTL_RSTPPSLIMIT, &tcp_rst_ppslim, 1, 1000 * 1000 }, 161 { TCPCTL_ACK_ON_PUSH, &tcp_ack_on_push, 0, 1 }, 162 #ifdef TCP_ECN 163 { TCPCTL_ECN, &tcp_do_ecn, 0, 1 }, 164 #endif 165 { TCPCTL_SYN_CACHE_LIMIT, &tcp_syn_cache_limit, 1, 1000 * 1000 }, 166 { TCPCTL_SYN_BUCKET_LIMIT, &tcp_syn_bucket_limit, 1, INT_MAX }, 167 { TCPCTL_RFC3390, &tcp_do_rfc3390, 0, 2 }, 168 { TCPCTL_ALWAYS_KEEPALIVE, &tcp_always_keepalive, 0, 1 }, 169 { TCPCTL_TSO, &tcp_do_tso, 0, 1 }, 170 }; 171 172 struct inpcbtable tcbtable; 173 174 int tcp_fill_info(struct tcpcb *, struct socket *, struct mbuf *); 175 int tcp_ident(void *, size_t *, void *, size_t, int); 176 177 static inline int tcp_sogetpcb(struct socket *, struct inpcb **, 178 struct tcpcb **); 179 180 static inline int 181 tcp_sogetpcb(struct socket *so, struct inpcb **rinp, struct tcpcb **rtp) 182 { 183 struct inpcb *inp; 184 struct tcpcb *tp; 185 186 /* 187 * When a TCP is attached to a socket, then there will be 188 * a (struct inpcb) pointed at by the socket, and this 189 * structure will point at a subsidiary (struct tcpcb). 190 */ 191 if ((inp = sotoinpcb(so)) == NULL || (tp = intotcpcb(inp)) == NULL) { 192 if (so->so_error) 193 return so->so_error; 194 return EINVAL; 195 } 196 197 *rinp = inp; 198 *rtp = tp; 199 200 return 0; 201 } 202 203 /* 204 * Export internal TCP state information via a struct tcp_info without 205 * leaking any sensitive information. Sequence numbers are reported 206 * relative to the initial sequence number. 207 */ 208 int 209 tcp_fill_info(struct tcpcb *tp, struct socket *so, struct mbuf *m) 210 { 211 struct proc *p = curproc; 212 struct tcp_info *ti; 213 u_int t = 1000; /* msec => usec */ 214 uint32_t now; 215 216 if (sizeof(*ti) > MLEN) { 217 MCLGETL(m, M_WAITOK, sizeof(*ti)); 218 if (!ISSET(m->m_flags, M_EXT)) 219 return ENOMEM; 220 } 221 ti = mtod(m, struct tcp_info *); 222 m->m_len = sizeof(*ti); 223 memset(ti, 0, sizeof(*ti)); 224 now = tcp_now(); 225 226 ti->tcpi_state = tp->t_state; 227 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 228 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 229 if (tp->t_flags & TF_SACK_PERMIT) 230 ti->tcpi_options |= TCPI_OPT_SACK; 231 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 232 ti->tcpi_options |= TCPI_OPT_WSCALE; 233 ti->tcpi_snd_wscale = tp->snd_scale; 234 ti->tcpi_rcv_wscale = tp->rcv_scale; 235 } 236 #ifdef TCP_ECN 237 if (tp->t_flags & TF_ECN_PERMIT) 238 ti->tcpi_options |= TCPI_OPT_ECN; 239 #endif 240 241 ti->tcpi_rto = tp->t_rxtcur * t; 242 ti->tcpi_snd_mss = tp->t_maxseg; 243 ti->tcpi_rcv_mss = tp->t_peermss; 244 245 ti->tcpi_last_data_sent = (now - tp->t_sndtime) * t; 246 ti->tcpi_last_ack_sent = (now - tp->t_sndacktime) * t; 247 ti->tcpi_last_data_recv = (now - tp->t_rcvtime) * t; 248 ti->tcpi_last_ack_recv = (now - tp->t_rcvacktime) * t; 249 250 ti->tcpi_rtt = ((uint64_t)tp->t_srtt * t) >> 251 (TCP_RTT_SHIFT + TCP_RTT_BASE_SHIFT); 252 ti->tcpi_rttvar = ((uint64_t)tp->t_rttvar * t) >> 253 (TCP_RTTVAR_SHIFT + TCP_RTT_BASE_SHIFT); 254 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 255 ti->tcpi_snd_cwnd = tp->snd_cwnd; 256 257 ti->tcpi_rcv_space = tp->rcv_wnd; 258 259 /* 260 * Provide only minimal information for unprivileged processes. 261 */ 262 if (suser(p) != 0) 263 return 0; 264 265 /* FreeBSD-specific extension fields for tcp_info. */ 266 ti->tcpi_snd_wnd = tp->snd_wnd; 267 ti->tcpi_snd_nxt = tp->snd_nxt - tp->iss; 268 ti->tcpi_rcv_nxt = tp->rcv_nxt - tp->irs; 269 /* missing tcpi_toe_tid */ 270 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 271 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 272 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 273 274 /* OpenBSD extensions */ 275 ti->tcpi_rttmin = tp->t_rttmin * t; 276 ti->tcpi_max_sndwnd = tp->max_sndwnd; 277 ti->tcpi_rcv_adv = tp->rcv_adv - tp->irs; 278 ti->tcpi_rcv_up = tp->rcv_up - tp->irs; 279 ti->tcpi_snd_una = tp->snd_una - tp->iss; 280 ti->tcpi_snd_up = tp->snd_up - tp->iss; 281 ti->tcpi_snd_wl1 = tp->snd_wl1 - tp->iss; 282 ti->tcpi_snd_wl2 = tp->snd_wl2 - tp->iss; 283 ti->tcpi_snd_max = tp->snd_max - tp->iss; 284 285 ti->tcpi_ts_recent = tp->ts_recent; /* XXX value from the wire */ 286 ti->tcpi_ts_recent_age = (now - tp->ts_recent_age) * t; 287 ti->tcpi_rfbuf_cnt = tp->rfbuf_cnt; 288 ti->tcpi_rfbuf_ts = (now - tp->rfbuf_ts) * t; 289 290 ti->tcpi_so_rcv_sb_cc = so->so_rcv.sb_cc; 291 ti->tcpi_so_rcv_sb_hiwat = so->so_rcv.sb_hiwat; 292 ti->tcpi_so_rcv_sb_lowat = so->so_rcv.sb_lowat; 293 ti->tcpi_so_rcv_sb_wat = so->so_rcv.sb_wat; 294 ti->tcpi_so_snd_sb_cc = so->so_snd.sb_cc; 295 ti->tcpi_so_snd_sb_hiwat = so->so_snd.sb_hiwat; 296 ti->tcpi_so_snd_sb_lowat = so->so_snd.sb_lowat; 297 ti->tcpi_so_snd_sb_wat = so->so_snd.sb_wat; 298 299 return 0; 300 } 301 302 int 303 tcp_ctloutput(int op, struct socket *so, int level, int optname, 304 struct mbuf *m) 305 { 306 int error = 0; 307 struct inpcb *inp; 308 struct tcpcb *tp; 309 int i; 310 311 inp = sotoinpcb(so); 312 if (inp == NULL) 313 return (ECONNRESET); 314 if (level != IPPROTO_TCP) { 315 switch (so->so_proto->pr_domain->dom_family) { 316 #ifdef INET6 317 case PF_INET6: 318 error = ip6_ctloutput(op, so, level, optname, m); 319 break; 320 #endif /* INET6 */ 321 case PF_INET: 322 error = ip_ctloutput(op, so, level, optname, m); 323 break; 324 default: 325 error = EAFNOSUPPORT; /*?*/ 326 break; 327 } 328 return (error); 329 } 330 tp = intotcpcb(inp); 331 332 switch (op) { 333 334 case PRCO_SETOPT: 335 switch (optname) { 336 337 case TCP_NODELAY: 338 if (m == NULL || m->m_len < sizeof (int)) 339 error = EINVAL; 340 else if (*mtod(m, int *)) 341 tp->t_flags |= TF_NODELAY; 342 else 343 tp->t_flags &= ~TF_NODELAY; 344 break; 345 346 case TCP_NOPUSH: 347 if (m == NULL || m->m_len < sizeof (int)) 348 error = EINVAL; 349 else if (*mtod(m, int *)) 350 tp->t_flags |= TF_NOPUSH; 351 else if (tp->t_flags & TF_NOPUSH) { 352 tp->t_flags &= ~TF_NOPUSH; 353 if (TCPS_HAVEESTABLISHED(tp->t_state)) 354 error = tcp_output(tp); 355 } 356 break; 357 358 case TCP_MAXSEG: 359 if (m == NULL || m->m_len < sizeof (int)) { 360 error = EINVAL; 361 break; 362 } 363 364 i = *mtod(m, int *); 365 if (i > 0 && i <= tp->t_maxseg) 366 tp->t_maxseg = i; 367 else 368 error = EINVAL; 369 break; 370 371 case TCP_SACK_ENABLE: 372 if (m == NULL || m->m_len < sizeof (int)) { 373 error = EINVAL; 374 break; 375 } 376 377 if (TCPS_HAVEESTABLISHED(tp->t_state)) { 378 error = EPERM; 379 break; 380 } 381 382 if (tp->t_flags & TF_SIGNATURE) { 383 error = EPERM; 384 break; 385 } 386 387 if (*mtod(m, int *)) 388 tp->sack_enable = 1; 389 else 390 tp->sack_enable = 0; 391 break; 392 #ifdef TCP_SIGNATURE 393 case TCP_MD5SIG: 394 if (m == NULL || m->m_len < sizeof (int)) { 395 error = EINVAL; 396 break; 397 } 398 399 if (TCPS_HAVEESTABLISHED(tp->t_state)) { 400 error = EPERM; 401 break; 402 } 403 404 if (*mtod(m, int *)) { 405 tp->t_flags |= TF_SIGNATURE; 406 tp->sack_enable = 0; 407 } else 408 tp->t_flags &= ~TF_SIGNATURE; 409 break; 410 #endif /* TCP_SIGNATURE */ 411 default: 412 error = ENOPROTOOPT; 413 break; 414 } 415 break; 416 417 case PRCO_GETOPT: 418 switch (optname) { 419 case TCP_NODELAY: 420 m->m_len = sizeof(int); 421 *mtod(m, int *) = tp->t_flags & TF_NODELAY; 422 break; 423 case TCP_NOPUSH: 424 m->m_len = sizeof(int); 425 *mtod(m, int *) = tp->t_flags & TF_NOPUSH; 426 break; 427 case TCP_MAXSEG: 428 m->m_len = sizeof(int); 429 *mtod(m, int *) = tp->t_maxseg; 430 break; 431 case TCP_SACK_ENABLE: 432 m->m_len = sizeof(int); 433 *mtod(m, int *) = tp->sack_enable; 434 break; 435 case TCP_INFO: 436 error = tcp_fill_info(tp, so, m); 437 break; 438 #ifdef TCP_SIGNATURE 439 case TCP_MD5SIG: 440 m->m_len = sizeof(int); 441 *mtod(m, int *) = tp->t_flags & TF_SIGNATURE; 442 break; 443 #endif 444 default: 445 error = ENOPROTOOPT; 446 break; 447 } 448 break; 449 } 450 return (error); 451 } 452 453 /* 454 * Attach TCP protocol to socket, allocating 455 * internet protocol control block, tcp control block, 456 * buffer space, and entering LISTEN state to accept connections. 457 */ 458 int 459 tcp_attach(struct socket *so, int proto, int wait) 460 { 461 struct tcpcb *tp; 462 struct inpcb *inp; 463 int error; 464 465 if (so->so_pcb) 466 return EISCONN; 467 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0 || 468 sbcheckreserve(so->so_snd.sb_wat, tcp_sendspace) || 469 sbcheckreserve(so->so_rcv.sb_wat, tcp_recvspace)) { 470 error = soreserve(so, tcp_sendspace, tcp_recvspace); 471 if (error) 472 return (error); 473 } 474 475 NET_ASSERT_LOCKED(); 476 error = in_pcballoc(so, &tcbtable, wait); 477 if (error) 478 return (error); 479 inp = sotoinpcb(so); 480 tp = tcp_newtcpcb(inp, wait); 481 if (tp == NULL) { 482 unsigned int nofd = so->so_state & SS_NOFDREF; /* XXX */ 483 484 so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */ 485 in_pcbdetach(inp); 486 so->so_state |= nofd; 487 return (ENOBUFS); 488 } 489 tp->t_state = TCPS_CLOSED; 490 #ifdef INET6 491 /* we disallow IPv4 mapped address completely. */ 492 if (inp->inp_flags & INP_IPV6) 493 tp->pf = PF_INET6; 494 else 495 tp->pf = PF_INET; 496 #else 497 tp->pf = PF_INET; 498 #endif 499 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 500 so->so_linger = TCP_LINGERTIME; 501 502 if (so->so_options & SO_DEBUG) 503 tcp_trace(TA_USER, TCPS_CLOSED, tp, tp, NULL, PRU_ATTACH, 0); 504 return (0); 505 } 506 507 int 508 tcp_detach(struct socket *so) 509 { 510 struct inpcb *inp; 511 struct tcpcb *otp = NULL, *tp; 512 int error = 0; 513 short ostate; 514 515 soassertlocked(so); 516 517 if ((error = tcp_sogetpcb(so, &inp, &tp))) 518 return (error); 519 520 if (so->so_options & SO_DEBUG) { 521 otp = tp; 522 ostate = tp->t_state; 523 } 524 525 /* 526 * Detach the TCP protocol from the socket. 527 * If the protocol state is non-embryonic, then can't 528 * do this directly: have to initiate a PRU_DISCONNECT, 529 * which may finish later; embryonic TCB's can just 530 * be discarded here. 531 */ 532 tp = tcp_dodisconnect(tp); 533 534 if (otp) 535 tcp_trace(TA_USER, ostate, tp, otp, NULL, PRU_DETACH, 0); 536 return (error); 537 } 538 539 /* 540 * Give the socket an address. 541 */ 542 int 543 tcp_bind(struct socket *so, struct mbuf *nam, struct proc *p) 544 { 545 struct inpcb *inp; 546 struct tcpcb *tp; 547 int error; 548 short ostate; 549 550 soassertlocked(so); 551 552 if ((error = tcp_sogetpcb(so, &inp, &tp))) 553 return (error); 554 555 if (so->so_options & SO_DEBUG) 556 ostate = tp->t_state; 557 558 error = in_pcbbind(inp, nam, p); 559 560 if (so->so_options & SO_DEBUG) 561 tcp_trace(TA_USER, ostate, tp, tp, NULL, PRU_BIND, 0); 562 return (error); 563 } 564 565 /* 566 * Prepare to accept connections. 567 */ 568 int 569 tcp_listen(struct socket *so) 570 { 571 struct inpcb *inp; 572 struct tcpcb *tp, *otp = NULL; 573 int error; 574 short ostate; 575 576 soassertlocked(so); 577 578 if ((error = tcp_sogetpcb(so, &inp, &tp))) 579 return (error); 580 581 if (so->so_options & SO_DEBUG) { 582 otp = tp; 583 ostate = tp->t_state; 584 } 585 586 if (inp->inp_lport == 0) 587 if ((error = in_pcbbind(inp, NULL, curproc))) 588 goto out; 589 590 /* 591 * If the in_pcbbind() above is called, the tp->pf 592 * should still be whatever it was before. 593 */ 594 tp->t_state = TCPS_LISTEN; 595 596 out: 597 if (otp) 598 tcp_trace(TA_USER, ostate, tp, otp, NULL, PRU_LISTEN, 0); 599 return (error); 600 } 601 602 /* 603 * Initiate connection to peer. 604 * Create a template for use in transmissions on this connection. 605 * Enter SYN_SENT state, and mark socket as connecting. 606 * Start keep-alive timer, and seed output sequence space. 607 * Send initial segment on connection. 608 */ 609 int 610 tcp_connect(struct socket *so, struct mbuf *nam) 611 { 612 struct inpcb *inp; 613 struct tcpcb *tp, *otp = NULL; 614 int error; 615 short ostate; 616 617 soassertlocked(so); 618 619 if ((error = tcp_sogetpcb(so, &inp, &tp))) 620 return (error); 621 622 if (so->so_options & SO_DEBUG) { 623 otp = tp; 624 ostate = tp->t_state; 625 } 626 627 #ifdef INET6 628 if (inp->inp_flags & INP_IPV6) { 629 struct sockaddr_in6 *sin6; 630 631 if ((error = in6_nam2sin6(nam, &sin6))) 632 goto out; 633 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 634 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 635 error = EINVAL; 636 goto out; 637 } 638 error = in6_pcbconnect(inp, nam); 639 } else 640 #endif /* INET6 */ 641 { 642 struct sockaddr_in *sin; 643 644 if ((error = in_nam2sin(nam, &sin))) 645 goto out; 646 if ((sin->sin_addr.s_addr == INADDR_ANY) || 647 (sin->sin_addr.s_addr == INADDR_BROADCAST) || 648 IN_MULTICAST(sin->sin_addr.s_addr) || 649 in_broadcast(sin->sin_addr, inp->inp_rtableid)) { 650 error = EINVAL; 651 goto out; 652 } 653 error = in_pcbconnect(inp, nam); 654 } 655 if (error) 656 goto out; 657 658 tp->t_template = tcp_template(tp); 659 if (tp->t_template == 0) { 660 in_pcbdisconnect(inp); 661 error = ENOBUFS; 662 goto out; 663 } 664 665 so->so_state |= SS_CONNECTOUT; 666 667 /* Compute window scaling to request. */ 668 tcp_rscale(tp, sb_max); 669 670 soisconnecting(so); 671 tcpstat_inc(tcps_connattempt); 672 tp->t_state = TCPS_SYN_SENT; 673 TCP_TIMER_ARM(tp, TCPT_KEEP, tcptv_keep_init); 674 tcp_set_iss_tsm(tp); 675 tcp_sendseqinit(tp); 676 tp->snd_last = tp->snd_una; 677 error = tcp_output(tp); 678 679 out: 680 if (otp) 681 tcp_trace(TA_USER, ostate, tp, otp, NULL, PRU_CONNECT, 0); 682 return (error); 683 } 684 685 /* 686 * Accept a connection. Essentially all the work is done at higher 687 * levels; just return the address of the peer, storing through addr. 688 */ 689 int 690 tcp_accept(struct socket *so, struct mbuf *nam) 691 { 692 struct inpcb *inp; 693 struct tcpcb *tp; 694 int error; 695 short ostate; 696 697 soassertlocked(so); 698 699 if ((error = tcp_sogetpcb(so, &inp, &tp))) 700 return (error); 701 702 if (so->so_options & SO_DEBUG) 703 ostate = tp->t_state; 704 705 #ifdef INET6 706 if (inp->inp_flags & INP_IPV6) 707 in6_setpeeraddr(inp, nam); 708 else 709 #endif 710 in_setpeeraddr(inp, nam); 711 712 if (so->so_options & SO_DEBUG) 713 tcp_trace(TA_USER, ostate, tp, tp, NULL, PRU_ACCEPT, 0); 714 return (error); 715 } 716 717 /* 718 * Initiate disconnect from peer. 719 * If connection never passed embryonic stage, just drop; 720 * else if don't need to let data drain, then can just drop anyways, 721 * else have to begin TCP shutdown process: mark socket disconnecting, 722 * drain unread data, state switch to reflect user close, and 723 * send segment (e.g. FIN) to peer. Socket will be really disconnected 724 * when peer sends FIN and acks ours. 725 * 726 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 727 */ 728 int 729 tcp_disconnect(struct socket *so) 730 { 731 struct inpcb *inp; 732 struct tcpcb *tp, *otp = NULL; 733 int error; 734 short ostate; 735 736 soassertlocked(so); 737 738 if ((error = tcp_sogetpcb(so, &inp, &tp))) 739 return (error); 740 741 if (so->so_options & SO_DEBUG) { 742 otp = tp; 743 ostate = tp->t_state; 744 } 745 746 tp = tcp_dodisconnect(tp); 747 748 if (otp) 749 tcp_trace(TA_USER, ostate, tp, otp, NULL, PRU_DISCONNECT, 0); 750 return (0); 751 } 752 753 /* 754 * Mark the connection as being incapable of further output. 755 */ 756 int 757 tcp_shutdown(struct socket *so) 758 { 759 struct inpcb *inp; 760 struct tcpcb *tp, *otp = NULL; 761 int error; 762 short ostate; 763 764 soassertlocked(so); 765 766 if ((error = tcp_sogetpcb(so, &inp, &tp))) 767 return (error); 768 769 if (so->so_options & SO_DEBUG) { 770 otp = tp; 771 ostate = tp->t_state; 772 } 773 774 if (so->so_snd.sb_state & SS_CANTSENDMORE) 775 goto out; 776 777 socantsendmore(so); 778 tp = tcp_usrclosed(tp); 779 if (tp) 780 error = tcp_output(tp); 781 782 out: 783 if (otp) 784 tcp_trace(TA_USER, ostate, tp, otp, NULL, PRU_SHUTDOWN, 0); 785 return (error); 786 } 787 788 /* 789 * After a receive, possibly send window update to peer. 790 */ 791 void 792 tcp_rcvd(struct socket *so) 793 { 794 struct inpcb *inp; 795 struct tcpcb *tp; 796 short ostate; 797 798 soassertlocked(so); 799 800 if (tcp_sogetpcb(so, &inp, &tp)) 801 return; 802 803 if (so->so_options & SO_DEBUG) 804 ostate = tp->t_state; 805 806 /* 807 * soreceive() calls this function when a user receives 808 * ancillary data on a listening socket. We don't call 809 * tcp_output in such a case, since there is no header 810 * template for a listening socket and hence the kernel 811 * will panic. 812 */ 813 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) != 0) 814 (void) tcp_output(tp); 815 816 if (so->so_options & SO_DEBUG) 817 tcp_trace(TA_USER, ostate, tp, tp, NULL, PRU_RCVD, 0); 818 } 819 820 /* 821 * Do a send by putting data in output queue and updating urgent 822 * marker if URG set. Possibly send more data. 823 */ 824 int 825 tcp_send(struct socket *so, struct mbuf *m, struct mbuf *nam, 826 struct mbuf *control) 827 { 828 struct inpcb *inp; 829 struct tcpcb *tp; 830 int error; 831 short ostate; 832 833 soassertlocked(so); 834 835 if (control && control->m_len) { 836 error = EINVAL; 837 goto out; 838 } 839 840 if ((error = tcp_sogetpcb(so, &inp, &tp))) 841 goto out; 842 843 if (so->so_options & SO_DEBUG) 844 ostate = tp->t_state; 845 846 sbappendstream(so, &so->so_snd, m); 847 m = NULL; 848 849 error = tcp_output(tp); 850 851 if (so->so_options & SO_DEBUG) 852 tcp_trace(TA_USER, ostate, tp, tp, NULL, PRU_SEND, 0); 853 854 out: 855 m_freem(control); 856 m_freem(m); 857 858 return (error); 859 } 860 861 /* 862 * Abort the TCP. 863 */ 864 void 865 tcp_abort(struct socket *so) 866 { 867 struct inpcb *inp; 868 struct tcpcb *tp, *otp = NULL; 869 short ostate; 870 871 soassertlocked(so); 872 873 if (tcp_sogetpcb(so, &inp, &tp)) 874 return; 875 876 if (so->so_options & SO_DEBUG) { 877 otp = tp; 878 ostate = tp->t_state; 879 } 880 881 tp = tcp_drop(tp, ECONNABORTED); 882 883 if (otp) 884 tcp_trace(TA_USER, ostate, tp, otp, NULL, PRU_ABORT, 0); 885 } 886 887 int 888 tcp_sense(struct socket *so, struct stat *ub) 889 { 890 struct inpcb *inp; 891 struct tcpcb *tp; 892 int error; 893 894 soassertlocked(so); 895 896 if ((error = tcp_sogetpcb(so, &inp, &tp))) 897 return (error); 898 899 ub->st_blksize = so->so_snd.sb_hiwat; 900 901 if (so->so_options & SO_DEBUG) 902 tcp_trace(TA_USER, tp->t_state, tp, tp, NULL, PRU_SENSE, 0); 903 return (0); 904 } 905 906 int 907 tcp_rcvoob(struct socket *so, struct mbuf *m, int flags) 908 { 909 struct inpcb *inp; 910 struct tcpcb *tp; 911 int error; 912 913 soassertlocked(so); 914 915 if ((error = tcp_sogetpcb(so, &inp, &tp))) 916 return (error); 917 918 if ((so->so_oobmark == 0 && 919 (so->so_rcv.sb_state & SS_RCVATMARK) == 0) || 920 so->so_options & SO_OOBINLINE || 921 tp->t_oobflags & TCPOOB_HADDATA) { 922 error = EINVAL; 923 goto out; 924 } 925 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 926 error = EWOULDBLOCK; 927 goto out; 928 } 929 m->m_len = 1; 930 *mtod(m, caddr_t) = tp->t_iobc; 931 if ((flags & MSG_PEEK) == 0) 932 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 933 out: 934 if (so->so_options & SO_DEBUG) 935 tcp_trace(TA_USER, tp->t_state, tp, tp, NULL, PRU_RCVOOB, 0); 936 return (error); 937 } 938 939 int 940 tcp_sendoob(struct socket *so, struct mbuf *m, struct mbuf *nam, 941 struct mbuf *control) 942 { 943 struct inpcb *inp; 944 struct tcpcb *tp; 945 int error; 946 short ostate; 947 948 soassertlocked(so); 949 950 if (control && control->m_len) { 951 error = EINVAL; 952 goto release; 953 } 954 955 if ((error = tcp_sogetpcb(so, &inp, &tp))) 956 goto release; 957 958 if (so->so_options & SO_DEBUG) 959 ostate = tp->t_state; 960 961 if (sbspace(so, &so->so_snd) < -512) { 962 error = ENOBUFS; 963 goto out; 964 } 965 966 /* 967 * According to RFC961 (Assigned Protocols), 968 * the urgent pointer points to the last octet 969 * of urgent data. We continue, however, 970 * to consider it to indicate the first octet 971 * of data past the urgent section. 972 * Otherwise, snd_up should be one lower. 973 */ 974 sbappendstream(so, &so->so_snd, m); 975 m = NULL; 976 tp->snd_up = tp->snd_una + so->so_snd.sb_cc; 977 tp->t_force = 1; 978 error = tcp_output(tp); 979 tp->t_force = 0; 980 981 out: 982 if (so->so_options & SO_DEBUG) 983 tcp_trace(TA_USER, ostate, tp, tp, NULL, PRU_SENDOOB, 0); 984 985 release: 986 m_freem(control); 987 m_freem(m); 988 989 return (error); 990 } 991 992 int 993 tcp_sockaddr(struct socket *so, struct mbuf *nam) 994 { 995 struct inpcb *inp; 996 struct tcpcb *tp; 997 int error; 998 999 soassertlocked(so); 1000 1001 if ((error = tcp_sogetpcb(so, &inp, &tp))) 1002 return (error); 1003 1004 #ifdef INET6 1005 if (inp->inp_flags & INP_IPV6) 1006 in6_setsockaddr(inp, nam); 1007 else 1008 #endif 1009 in_setsockaddr(inp, nam); 1010 1011 if (so->so_options & SO_DEBUG) 1012 tcp_trace(TA_USER, tp->t_state, tp, tp, NULL, 1013 PRU_SOCKADDR, 0); 1014 return (0); 1015 } 1016 1017 int 1018 tcp_peeraddr(struct socket *so, struct mbuf *nam) 1019 { 1020 struct inpcb *inp; 1021 struct tcpcb *tp; 1022 int error; 1023 1024 soassertlocked(so); 1025 1026 if ((error = tcp_sogetpcb(so, &inp, &tp))) 1027 return (error); 1028 1029 #ifdef INET6 1030 if (inp->inp_flags & INP_IPV6) 1031 in6_setpeeraddr(inp, nam); 1032 else 1033 #endif 1034 in_setpeeraddr(inp, nam); 1035 1036 if (so->so_options & SO_DEBUG) 1037 tcp_trace(TA_USER, tp->t_state, tp, tp, NULL, 1038 PRU_PEERADDR, 0); 1039 return (0); 1040 } 1041 1042 /* 1043 * Initiate (or continue) disconnect. 1044 * If embryonic state, just send reset (once). 1045 * If in ``let data drain'' option and linger null, just drop. 1046 * Otherwise (hard), mark socket disconnecting and drop 1047 * current input data; switch states based on user close, and 1048 * send segment to peer (with FIN). 1049 */ 1050 struct tcpcb * 1051 tcp_dodisconnect(struct tcpcb *tp) 1052 { 1053 struct socket *so = tp->t_inpcb->inp_socket; 1054 1055 if (TCPS_HAVEESTABLISHED(tp->t_state) == 0) 1056 tp = tcp_close(tp); 1057 else if ((so->so_options & SO_LINGER) && so->so_linger == 0) 1058 tp = tcp_drop(tp, 0); 1059 else { 1060 soisdisconnecting(so); 1061 sbflush(so, &so->so_rcv); 1062 tp = tcp_usrclosed(tp); 1063 if (tp) 1064 (void) tcp_output(tp); 1065 } 1066 return (tp); 1067 } 1068 1069 /* 1070 * User issued close, and wish to trail through shutdown states: 1071 * if never received SYN, just forget it. If got a SYN from peer, 1072 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1073 * If already got a FIN from peer, then almost done; go to LAST_ACK 1074 * state. In all other cases, have already sent FIN to peer (e.g. 1075 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1076 * for peer to send FIN or not respond to keep-alives, etc. 1077 * We can let the user exit from the close as soon as the FIN is acked. 1078 */ 1079 struct tcpcb * 1080 tcp_usrclosed(struct tcpcb *tp) 1081 { 1082 1083 switch (tp->t_state) { 1084 1085 case TCPS_CLOSED: 1086 case TCPS_LISTEN: 1087 case TCPS_SYN_SENT: 1088 tp->t_state = TCPS_CLOSED; 1089 tp = tcp_close(tp); 1090 break; 1091 1092 case TCPS_SYN_RECEIVED: 1093 case TCPS_ESTABLISHED: 1094 tp->t_state = TCPS_FIN_WAIT_1; 1095 break; 1096 1097 case TCPS_CLOSE_WAIT: 1098 tp->t_state = TCPS_LAST_ACK; 1099 break; 1100 } 1101 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) { 1102 soisdisconnected(tp->t_inpcb->inp_socket); 1103 /* 1104 * If we are in FIN_WAIT_2, we arrived here because the 1105 * application did a shutdown of the send side. Like the 1106 * case of a transition from FIN_WAIT_1 to FIN_WAIT_2 after 1107 * a full close, we start a timer to make sure sockets are 1108 * not left in FIN_WAIT_2 forever. 1109 */ 1110 if (tp->t_state == TCPS_FIN_WAIT_2) 1111 TCP_TIMER_ARM(tp, TCPT_2MSL, tcp_maxidle); 1112 } 1113 return (tp); 1114 } 1115 1116 /* 1117 * Look up a socket for ident or tcpdrop, ... 1118 */ 1119 int 1120 tcp_ident(void *oldp, size_t *oldlenp, void *newp, size_t newlen, int dodrop) 1121 { 1122 int error = 0; 1123 struct tcp_ident_mapping tir; 1124 struct inpcb *inp; 1125 struct tcpcb *tp = NULL; 1126 struct sockaddr_in *fin, *lin; 1127 #ifdef INET6 1128 struct sockaddr_in6 *fin6, *lin6; 1129 struct in6_addr f6, l6; 1130 #endif 1131 1132 NET_ASSERT_LOCKED(); 1133 1134 if (dodrop) { 1135 if (oldp != NULL || *oldlenp != 0) 1136 return (EINVAL); 1137 if (newp == NULL) 1138 return (EPERM); 1139 if (newlen < sizeof(tir)) 1140 return (ENOMEM); 1141 if ((error = copyin(newp, &tir, sizeof (tir))) != 0 ) 1142 return (error); 1143 } else { 1144 if (oldp == NULL) 1145 return (EINVAL); 1146 if (*oldlenp < sizeof(tir)) 1147 return (ENOMEM); 1148 if (newp != NULL || newlen != 0) 1149 return (EINVAL); 1150 if ((error = copyin(oldp, &tir, sizeof (tir))) != 0 ) 1151 return (error); 1152 } 1153 switch (tir.faddr.ss_family) { 1154 #ifdef INET6 1155 case AF_INET6: 1156 fin6 = (struct sockaddr_in6 *)&tir.faddr; 1157 error = in6_embedscope(&f6, fin6, NULL); 1158 if (error) 1159 return EINVAL; /*?*/ 1160 lin6 = (struct sockaddr_in6 *)&tir.laddr; 1161 error = in6_embedscope(&l6, lin6, NULL); 1162 if (error) 1163 return EINVAL; /*?*/ 1164 break; 1165 #endif 1166 case AF_INET: 1167 fin = (struct sockaddr_in *)&tir.faddr; 1168 lin = (struct sockaddr_in *)&tir.laddr; 1169 break; 1170 default: 1171 return (EINVAL); 1172 } 1173 1174 switch (tir.faddr.ss_family) { 1175 #ifdef INET6 1176 case AF_INET6: 1177 inp = in6_pcblookup(&tcbtable, &f6, 1178 fin6->sin6_port, &l6, lin6->sin6_port, tir.rdomain); 1179 break; 1180 #endif 1181 case AF_INET: 1182 inp = in_pcblookup(&tcbtable, fin->sin_addr, 1183 fin->sin_port, lin->sin_addr, lin->sin_port, tir.rdomain); 1184 break; 1185 default: 1186 unhandled_af(tir.faddr.ss_family); 1187 } 1188 1189 if (dodrop) { 1190 if (inp && (tp = intotcpcb(inp)) && 1191 ((inp->inp_socket->so_options & SO_ACCEPTCONN) == 0)) 1192 tp = tcp_drop(tp, ECONNABORTED); 1193 else 1194 error = ESRCH; 1195 in_pcbunref(inp); 1196 return (error); 1197 } 1198 1199 if (inp == NULL) { 1200 tcpstat_inc(tcps_pcbhashmiss); 1201 switch (tir.faddr.ss_family) { 1202 #ifdef INET6 1203 case AF_INET6: 1204 inp = in6_pcblookup_listen(&tcbtable, 1205 &l6, lin6->sin6_port, NULL, tir.rdomain); 1206 break; 1207 #endif 1208 case AF_INET: 1209 inp = in_pcblookup_listen(&tcbtable, 1210 lin->sin_addr, lin->sin_port, NULL, tir.rdomain); 1211 break; 1212 } 1213 } 1214 1215 if (inp != NULL && (inp->inp_socket->so_state & SS_CONNECTOUT)) { 1216 tir.ruid = inp->inp_socket->so_ruid; 1217 tir.euid = inp->inp_socket->so_euid; 1218 } else { 1219 tir.ruid = -1; 1220 tir.euid = -1; 1221 } 1222 1223 *oldlenp = sizeof (tir); 1224 error = copyout((void *)&tir, oldp, sizeof (tir)); 1225 in_pcbunref(inp); 1226 return (error); 1227 } 1228 1229 int 1230 tcp_sysctl_tcpstat(void *oldp, size_t *oldlenp, void *newp) 1231 { 1232 uint64_t counters[tcps_ncounters]; 1233 struct tcpstat tcpstat; 1234 struct syn_cache_set *set; 1235 int i = 0; 1236 1237 #define ASSIGN(field) do { tcpstat.field = counters[i++]; } while (0) 1238 1239 memset(&tcpstat, 0, sizeof tcpstat); 1240 counters_read(tcpcounters, counters, nitems(counters)); 1241 ASSIGN(tcps_connattempt); 1242 ASSIGN(tcps_accepts); 1243 ASSIGN(tcps_connects); 1244 ASSIGN(tcps_drops); 1245 ASSIGN(tcps_conndrops); 1246 ASSIGN(tcps_closed); 1247 ASSIGN(tcps_segstimed); 1248 ASSIGN(tcps_rttupdated); 1249 ASSIGN(tcps_delack); 1250 ASSIGN(tcps_timeoutdrop); 1251 ASSIGN(tcps_rexmttimeo); 1252 ASSIGN(tcps_persisttimeo); 1253 ASSIGN(tcps_persistdrop); 1254 ASSIGN(tcps_keeptimeo); 1255 ASSIGN(tcps_keepprobe); 1256 ASSIGN(tcps_keepdrops); 1257 ASSIGN(tcps_sndtotal); 1258 ASSIGN(tcps_sndpack); 1259 ASSIGN(tcps_sndbyte); 1260 ASSIGN(tcps_sndrexmitpack); 1261 ASSIGN(tcps_sndrexmitbyte); 1262 ASSIGN(tcps_sndrexmitfast); 1263 ASSIGN(tcps_sndacks); 1264 ASSIGN(tcps_sndprobe); 1265 ASSIGN(tcps_sndurg); 1266 ASSIGN(tcps_sndwinup); 1267 ASSIGN(tcps_sndctrl); 1268 ASSIGN(tcps_rcvtotal); 1269 ASSIGN(tcps_rcvpack); 1270 ASSIGN(tcps_rcvbyte); 1271 ASSIGN(tcps_rcvbadsum); 1272 ASSIGN(tcps_rcvbadoff); 1273 ASSIGN(tcps_rcvmemdrop); 1274 ASSIGN(tcps_rcvnosec); 1275 ASSIGN(tcps_rcvshort); 1276 ASSIGN(tcps_rcvduppack); 1277 ASSIGN(tcps_rcvdupbyte); 1278 ASSIGN(tcps_rcvpartduppack); 1279 ASSIGN(tcps_rcvpartdupbyte); 1280 ASSIGN(tcps_rcvoopack); 1281 ASSIGN(tcps_rcvoobyte); 1282 ASSIGN(tcps_rcvpackafterwin); 1283 ASSIGN(tcps_rcvbyteafterwin); 1284 ASSIGN(tcps_rcvafterclose); 1285 ASSIGN(tcps_rcvwinprobe); 1286 ASSIGN(tcps_rcvdupack); 1287 ASSIGN(tcps_rcvacktoomuch); 1288 ASSIGN(tcps_rcvacktooold); 1289 ASSIGN(tcps_rcvackpack); 1290 ASSIGN(tcps_rcvackbyte); 1291 ASSIGN(tcps_rcvwinupd); 1292 ASSIGN(tcps_pawsdrop); 1293 ASSIGN(tcps_predack); 1294 ASSIGN(tcps_preddat); 1295 ASSIGN(tcps_pcbhashmiss); 1296 ASSIGN(tcps_noport); 1297 ASSIGN(tcps_badsyn); 1298 ASSIGN(tcps_dropsyn); 1299 ASSIGN(tcps_rcvbadsig); 1300 ASSIGN(tcps_rcvgoodsig); 1301 ASSIGN(tcps_inswcsum); 1302 ASSIGN(tcps_outswcsum); 1303 ASSIGN(tcps_ecn_accepts); 1304 ASSIGN(tcps_ecn_rcvece); 1305 ASSIGN(tcps_ecn_rcvcwr); 1306 ASSIGN(tcps_ecn_rcvce); 1307 ASSIGN(tcps_ecn_sndect); 1308 ASSIGN(tcps_ecn_sndece); 1309 ASSIGN(tcps_ecn_sndcwr); 1310 ASSIGN(tcps_cwr_ecn); 1311 ASSIGN(tcps_cwr_frecovery); 1312 ASSIGN(tcps_cwr_timeout); 1313 ASSIGN(tcps_sc_added); 1314 ASSIGN(tcps_sc_completed); 1315 ASSIGN(tcps_sc_timed_out); 1316 ASSIGN(tcps_sc_overflowed); 1317 ASSIGN(tcps_sc_reset); 1318 ASSIGN(tcps_sc_unreach); 1319 ASSIGN(tcps_sc_bucketoverflow); 1320 ASSIGN(tcps_sc_aborted); 1321 ASSIGN(tcps_sc_dupesyn); 1322 ASSIGN(tcps_sc_dropped); 1323 ASSIGN(tcps_sc_collisions); 1324 ASSIGN(tcps_sc_retransmitted); 1325 ASSIGN(tcps_sc_seedrandom); 1326 ASSIGN(tcps_sc_hash_size); 1327 ASSIGN(tcps_sc_entry_count); 1328 ASSIGN(tcps_sc_entry_limit); 1329 ASSIGN(tcps_sc_bucket_maxlen); 1330 ASSIGN(tcps_sc_bucket_limit); 1331 ASSIGN(tcps_sc_uses_left); 1332 ASSIGN(tcps_conndrained); 1333 ASSIGN(tcps_sack_recovery_episode); 1334 ASSIGN(tcps_sack_rexmits); 1335 ASSIGN(tcps_sack_rexmit_bytes); 1336 ASSIGN(tcps_sack_rcv_opts); 1337 ASSIGN(tcps_sack_snd_opts); 1338 ASSIGN(tcps_sack_drop_opts); 1339 ASSIGN(tcps_outswtso); 1340 ASSIGN(tcps_outhwtso); 1341 ASSIGN(tcps_outpkttso); 1342 ASSIGN(tcps_outbadtso); 1343 ASSIGN(tcps_inhwlro); 1344 ASSIGN(tcps_inpktlro); 1345 ASSIGN(tcps_inbadlro); 1346 1347 #undef ASSIGN 1348 1349 set = &tcp_syn_cache[tcp_syn_cache_active]; 1350 tcpstat.tcps_sc_hash_size = set->scs_size; 1351 tcpstat.tcps_sc_entry_count = set->scs_count; 1352 tcpstat.tcps_sc_entry_limit = tcp_syn_cache_limit; 1353 tcpstat.tcps_sc_bucket_maxlen = 0; 1354 for (i = 0; i < set->scs_size; i++) { 1355 if (tcpstat.tcps_sc_bucket_maxlen < 1356 set->scs_buckethead[i].sch_length) 1357 tcpstat.tcps_sc_bucket_maxlen = 1358 set->scs_buckethead[i].sch_length; 1359 } 1360 tcpstat.tcps_sc_bucket_limit = tcp_syn_bucket_limit; 1361 tcpstat.tcps_sc_uses_left = set->scs_use; 1362 1363 return (sysctl_rdstruct(oldp, oldlenp, newp, 1364 &tcpstat, sizeof(tcpstat))); 1365 } 1366 1367 /* 1368 * Sysctl for tcp variables. 1369 */ 1370 int 1371 tcp_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 1372 size_t newlen) 1373 { 1374 int error, nval; 1375 1376 /* All sysctl names at this level are terminal. */ 1377 if (namelen != 1) 1378 return (ENOTDIR); 1379 1380 switch (name[0]) { 1381 case TCPCTL_KEEPINITTIME: 1382 NET_LOCK(); 1383 nval = tcptv_keep_init / TCP_TIME(1); 1384 error = sysctl_int_bounded(oldp, oldlenp, newp, newlen, &nval, 1385 1, 3 * (TCPTV_KEEP_INIT / TCP_TIME(1))); 1386 if (!error) 1387 tcptv_keep_init = TCP_TIME(nval); 1388 NET_UNLOCK(); 1389 return (error); 1390 1391 case TCPCTL_KEEPIDLE: 1392 NET_LOCK(); 1393 nval = tcp_keepidle / TCP_TIME(1); 1394 error = sysctl_int_bounded(oldp, oldlenp, newp, newlen, &nval, 1395 1, 5 * (TCPTV_KEEP_IDLE / TCP_TIME(1))); 1396 if (!error) 1397 tcp_keepidle = TCP_TIME(nval); 1398 NET_UNLOCK(); 1399 return (error); 1400 1401 case TCPCTL_KEEPINTVL: 1402 NET_LOCK(); 1403 nval = tcp_keepintvl / TCP_TIME(1); 1404 error = sysctl_int_bounded(oldp, oldlenp, newp, newlen, &nval, 1405 1, 3 * (TCPTV_KEEPINTVL / TCP_TIME(1))); 1406 if (!error) 1407 tcp_keepintvl = TCP_TIME(nval); 1408 NET_UNLOCK(); 1409 return (error); 1410 1411 case TCPCTL_BADDYNAMIC: 1412 NET_LOCK(); 1413 error = sysctl_struct(oldp, oldlenp, newp, newlen, 1414 baddynamicports.tcp, sizeof(baddynamicports.tcp)); 1415 NET_UNLOCK(); 1416 return (error); 1417 1418 case TCPCTL_ROOTONLY: 1419 if (newp && securelevel > 0) 1420 return (EPERM); 1421 NET_LOCK(); 1422 error = sysctl_struct(oldp, oldlenp, newp, newlen, 1423 rootonlyports.tcp, sizeof(rootonlyports.tcp)); 1424 NET_UNLOCK(); 1425 return (error); 1426 1427 case TCPCTL_IDENT: 1428 NET_LOCK(); 1429 error = tcp_ident(oldp, oldlenp, newp, newlen, 0); 1430 NET_UNLOCK(); 1431 return (error); 1432 1433 case TCPCTL_DROP: 1434 NET_LOCK(); 1435 error = tcp_ident(oldp, oldlenp, newp, newlen, 1); 1436 NET_UNLOCK(); 1437 return (error); 1438 1439 case TCPCTL_REASS_LIMIT: 1440 NET_LOCK(); 1441 nval = tcp_reass_limit; 1442 error = sysctl_int(oldp, oldlenp, newp, newlen, &nval); 1443 if (!error && nval != tcp_reass_limit) { 1444 error = pool_sethardlimit(&tcpqe_pool, nval, NULL, 0); 1445 if (!error) 1446 tcp_reass_limit = nval; 1447 } 1448 NET_UNLOCK(); 1449 return (error); 1450 1451 case TCPCTL_SACKHOLE_LIMIT: 1452 NET_LOCK(); 1453 nval = tcp_sackhole_limit; 1454 error = sysctl_int(oldp, oldlenp, newp, newlen, &nval); 1455 if (!error && nval != tcp_sackhole_limit) { 1456 error = pool_sethardlimit(&sackhl_pool, nval, NULL, 0); 1457 if (!error) 1458 tcp_sackhole_limit = nval; 1459 } 1460 NET_UNLOCK(); 1461 return (error); 1462 1463 case TCPCTL_STATS: 1464 return (tcp_sysctl_tcpstat(oldp, oldlenp, newp)); 1465 1466 case TCPCTL_SYN_USE_LIMIT: 1467 NET_LOCK(); 1468 error = sysctl_int_bounded(oldp, oldlenp, newp, newlen, 1469 &tcp_syn_use_limit, 0, INT_MAX); 1470 if (!error && newp != NULL) { 1471 /* 1472 * Global tcp_syn_use_limit is used when reseeding a 1473 * new cache. Also update the value in active cache. 1474 */ 1475 if (tcp_syn_cache[0].scs_use > tcp_syn_use_limit) 1476 tcp_syn_cache[0].scs_use = tcp_syn_use_limit; 1477 if (tcp_syn_cache[1].scs_use > tcp_syn_use_limit) 1478 tcp_syn_cache[1].scs_use = tcp_syn_use_limit; 1479 } 1480 NET_UNLOCK(); 1481 return (error); 1482 1483 case TCPCTL_SYN_HASH_SIZE: 1484 NET_LOCK(); 1485 nval = tcp_syn_hash_size; 1486 error = sysctl_int_bounded(oldp, oldlenp, newp, newlen, 1487 &nval, 1, 100000); 1488 if (!error && nval != tcp_syn_hash_size) { 1489 /* 1490 * If global hash size has been changed, 1491 * switch sets as soon as possible. Then 1492 * the actual hash array will be reallocated. 1493 */ 1494 if (tcp_syn_cache[0].scs_size != nval) 1495 tcp_syn_cache[0].scs_use = 0; 1496 if (tcp_syn_cache[1].scs_size != nval) 1497 tcp_syn_cache[1].scs_use = 0; 1498 tcp_syn_hash_size = nval; 1499 } 1500 NET_UNLOCK(); 1501 return (error); 1502 1503 default: 1504 NET_LOCK(); 1505 error = sysctl_bounded_arr(tcpctl_vars, nitems(tcpctl_vars), 1506 name, namelen, oldp, oldlenp, newp, newlen); 1507 NET_UNLOCK(); 1508 return (error); 1509 } 1510 /* NOTREACHED */ 1511 } 1512 1513 /* 1514 * Scale the send buffer so that inflight data is not accounted against 1515 * the limit. The buffer will scale with the congestion window, if the 1516 * the receiver stops acking data the window will shrink and therefore 1517 * the buffer size will shrink as well. 1518 * In low memory situation try to shrink the buffer to the initial size 1519 * disabling the send buffer scaling as long as the situation persists. 1520 */ 1521 void 1522 tcp_update_sndspace(struct tcpcb *tp) 1523 { 1524 struct socket *so = tp->t_inpcb->inp_socket; 1525 u_long nmax = so->so_snd.sb_hiwat; 1526 1527 if (sbchecklowmem()) { 1528 /* low on memory try to get rid of some */ 1529 if (tcp_sendspace < nmax) 1530 nmax = tcp_sendspace; 1531 } else if (so->so_snd.sb_wat != tcp_sendspace) 1532 /* user requested buffer size, auto-scaling disabled */ 1533 nmax = so->so_snd.sb_wat; 1534 else 1535 /* automatic buffer scaling */ 1536 nmax = MIN(sb_max, so->so_snd.sb_wat + tp->snd_max - 1537 tp->snd_una); 1538 1539 /* a writable socket must be preserved because of poll(2) semantics */ 1540 if (sbspace(so, &so->so_snd) >= so->so_snd.sb_lowat) { 1541 if (nmax < so->so_snd.sb_cc + so->so_snd.sb_lowat) 1542 nmax = so->so_snd.sb_cc + so->so_snd.sb_lowat; 1543 /* keep in sync with sbreserve() calculation */ 1544 if (nmax * 8 < so->so_snd.sb_mbcnt + so->so_snd.sb_lowat) 1545 nmax = (so->so_snd.sb_mbcnt+so->so_snd.sb_lowat+7) / 8; 1546 } 1547 1548 /* round to MSS boundary */ 1549 nmax = roundup(nmax, tp->t_maxseg); 1550 1551 if (nmax != so->so_snd.sb_hiwat) 1552 sbreserve(so, &so->so_snd, nmax); 1553 } 1554 1555 /* 1556 * Scale the recv buffer by looking at how much data was transferred in 1557 * one approximated RTT. If more than a big part of the recv buffer was 1558 * transferred during that time we increase the buffer by a constant. 1559 * In low memory situation try to shrink the buffer to the initial size. 1560 */ 1561 void 1562 tcp_update_rcvspace(struct tcpcb *tp) 1563 { 1564 struct socket *so = tp->t_inpcb->inp_socket; 1565 u_long nmax = so->so_rcv.sb_hiwat; 1566 1567 if (sbchecklowmem()) { 1568 /* low on memory try to get rid of some */ 1569 if (tcp_recvspace < nmax) 1570 nmax = tcp_recvspace; 1571 } else if (so->so_rcv.sb_wat != tcp_recvspace) 1572 /* user requested buffer size, auto-scaling disabled */ 1573 nmax = so->so_rcv.sb_wat; 1574 else { 1575 /* automatic buffer scaling */ 1576 if (tp->rfbuf_cnt > so->so_rcv.sb_hiwat / 8 * 7) 1577 nmax = MIN(sb_max, so->so_rcv.sb_hiwat + 1578 tcp_autorcvbuf_inc); 1579 } 1580 1581 /* a readable socket must be preserved because of poll(2) semantics */ 1582 if (so->so_rcv.sb_cc >= so->so_rcv.sb_lowat && 1583 nmax < so->so_snd.sb_lowat) 1584 nmax = so->so_snd.sb_lowat; 1585 1586 if (nmax == so->so_rcv.sb_hiwat) 1587 return; 1588 1589 /* round to MSS boundary */ 1590 nmax = roundup(nmax, tp->t_maxseg); 1591 sbreserve(so, &so->so_rcv, nmax); 1592 } 1593