tcp_usrreq.c revision 1.113
1 /* $NetBSD: tcp_usrreq.c,v 1.113 2005/12/11 12:24:58 christos Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * 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 project 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 PROJECT 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 PROJECT 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 32 /*- 33 * Copyright (c) 1997, 1998, 2005 The NetBSD Foundation, Inc. 34 * All rights reserved. 35 * 36 * This code is derived from software contributed to The NetBSD Foundation 37 * by Jason R. Thorpe and Kevin M. Lahey of the Numerical Aerospace Simulation 38 * Facility, NASA Ames Research Center. 39 * This code is derived from software contributed to The NetBSD Foundation 40 * by Charles M. Hannum. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by the NetBSD 53 * Foundation, Inc. and its contributors. 54 * 4. Neither the name of The NetBSD Foundation nor the names of its 55 * contributors may be used to endorse or promote products derived 56 * from this software without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 59 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 60 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 61 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 62 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 63 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 64 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 65 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 66 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 67 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 68 * POSSIBILITY OF SUCH DAMAGE. 69 */ 70 71 /* 72 * Copyright (c) 1982, 1986, 1988, 1993, 1995 73 * The Regents of the University of California. All rights reserved. 74 * 75 * Redistribution and use in source and binary forms, with or without 76 * modification, are permitted provided that the following conditions 77 * are met: 78 * 1. Redistributions of source code must retain the above copyright 79 * notice, this list of conditions and the following disclaimer. 80 * 2. Redistributions in binary form must reproduce the above copyright 81 * notice, this list of conditions and the following disclaimer in the 82 * documentation and/or other materials provided with the distribution. 83 * 3. Neither the name of the University nor the names of its contributors 84 * may be used to endorse or promote products derived from this software 85 * without specific prior written permission. 86 * 87 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 88 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 89 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 90 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 91 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 92 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 93 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 94 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 95 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 96 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 97 * SUCH DAMAGE. 98 * 99 * @(#)tcp_usrreq.c 8.5 (Berkeley) 6/21/95 100 */ 101 102 #include <sys/cdefs.h> 103 __KERNEL_RCSID(0, "$NetBSD: tcp_usrreq.c,v 1.113 2005/12/11 12:24:58 christos Exp $"); 104 105 #include "opt_inet.h" 106 #include "opt_ipsec.h" 107 #include "opt_tcp_debug.h" 108 #include "opt_mbuftrace.h" 109 110 #include <sys/param.h> 111 #include <sys/systm.h> 112 #include <sys/kernel.h> 113 #include <sys/malloc.h> 114 #include <sys/mbuf.h> 115 #include <sys/socket.h> 116 #include <sys/socketvar.h> 117 #include <sys/protosw.h> 118 #include <sys/errno.h> 119 #include <sys/stat.h> 120 #include <sys/proc.h> 121 #include <sys/domain.h> 122 #include <sys/sysctl.h> 123 124 #include <net/if.h> 125 #include <net/route.h> 126 127 #include <netinet/in.h> 128 #include <netinet/in_systm.h> 129 #include <netinet/in_var.h> 130 #include <netinet/ip.h> 131 #include <netinet/in_pcb.h> 132 #include <netinet/ip_var.h> 133 #include <netinet/in_offload.h> 134 135 #ifdef INET6 136 #ifndef INET 137 #include <netinet/in.h> 138 #endif 139 #include <netinet/ip6.h> 140 #include <netinet6/in6_pcb.h> 141 #include <netinet6/ip6_var.h> 142 #endif 143 144 #include <netinet/tcp.h> 145 #include <netinet/tcp_fsm.h> 146 #include <netinet/tcp_seq.h> 147 #include <netinet/tcp_timer.h> 148 #include <netinet/tcp_var.h> 149 #include <netinet/tcpip.h> 150 #include <netinet/tcp_debug.h> 151 152 #include "opt_tcp_space.h" 153 154 #ifdef IPSEC 155 #include <netinet6/ipsec.h> 156 #endif /*IPSEC*/ 157 158 /* 159 * TCP protocol interface to socket abstraction. 160 */ 161 162 /* 163 * Process a TCP user request for TCP tb. If this is a send request 164 * then m is the mbuf chain of send data. If this is a timer expiration 165 * (called from the software clock routine), then timertype tells which timer. 166 */ 167 /*ARGSUSED*/ 168 int 169 tcp_usrreq(struct socket *so, int req, 170 struct mbuf *m, struct mbuf *nam, struct mbuf *control, struct lwp *l) 171 { 172 struct inpcb *inp; 173 #ifdef INET6 174 struct in6pcb *in6p; 175 #endif 176 struct tcpcb *tp = NULL; 177 struct proc *p; 178 int s; 179 int error = 0; 180 #ifdef TCP_DEBUG 181 int ostate = 0; 182 #endif 183 int family; /* family of the socket */ 184 185 p = l ? l->l_proc : NULL; 186 family = so->so_proto->pr_domain->dom_family; 187 188 if (req == PRU_CONTROL) { 189 switch (family) { 190 #ifdef INET 191 case PF_INET: 192 return (in_control(so, (long)m, (caddr_t)nam, 193 (struct ifnet *)control, p)); 194 #endif 195 #ifdef INET6 196 case PF_INET6: 197 return (in6_control(so, (long)m, (caddr_t)nam, 198 (struct ifnet *)control, p)); 199 #endif 200 default: 201 return EAFNOSUPPORT; 202 } 203 } 204 205 if (req == PRU_PURGEIF) { 206 switch (family) { 207 #ifdef INET 208 case PF_INET: 209 in_pcbpurgeif0(&tcbtable, (struct ifnet *)control); 210 in_purgeif((struct ifnet *)control); 211 in_pcbpurgeif(&tcbtable, (struct ifnet *)control); 212 break; 213 #endif 214 #ifdef INET6 215 case PF_INET6: 216 in6_pcbpurgeif0(&tcbtable, (struct ifnet *)control); 217 in6_purgeif((struct ifnet *)control); 218 in6_pcbpurgeif(&tcbtable, (struct ifnet *)control); 219 break; 220 #endif 221 default: 222 return (EAFNOSUPPORT); 223 } 224 return (0); 225 } 226 227 s = splsoftnet(); 228 switch (family) { 229 #ifdef INET 230 case PF_INET: 231 inp = sotoinpcb(so); 232 #ifdef INET6 233 in6p = NULL; 234 #endif 235 break; 236 #endif 237 #ifdef INET6 238 case PF_INET6: 239 inp = NULL; 240 in6p = sotoin6pcb(so); 241 break; 242 #endif 243 default: 244 splx(s); 245 return EAFNOSUPPORT; 246 } 247 248 #ifdef DIAGNOSTIC 249 #ifdef INET6 250 if (inp && in6p) 251 panic("tcp_usrreq: both inp and in6p set to non-NULL"); 252 #endif 253 if (req != PRU_SEND && req != PRU_SENDOOB && control) 254 panic("tcp_usrreq: unexpected control mbuf"); 255 #endif 256 /* 257 * When a TCP is attached to a socket, then there will be 258 * a (struct inpcb) pointed at by the socket, and this 259 * structure will point at a subsidary (struct tcpcb). 260 */ 261 #ifndef INET6 262 if (inp == 0 && req != PRU_ATTACH) 263 #else 264 if ((inp == 0 && in6p == 0) && req != PRU_ATTACH) 265 #endif 266 { 267 error = EINVAL; 268 goto release; 269 } 270 #ifdef INET 271 if (inp) { 272 tp = intotcpcb(inp); 273 /* WHAT IF TP IS 0? */ 274 #ifdef KPROF 275 tcp_acounts[tp->t_state][req]++; 276 #endif 277 #ifdef TCP_DEBUG 278 ostate = tp->t_state; 279 #endif 280 } 281 #endif 282 #ifdef INET6 283 if (in6p) { 284 tp = in6totcpcb(in6p); 285 /* WHAT IF TP IS 0? */ 286 #ifdef KPROF 287 tcp_acounts[tp->t_state][req]++; 288 #endif 289 #ifdef TCP_DEBUG 290 ostate = tp->t_state; 291 #endif 292 } 293 #endif 294 295 switch (req) { 296 297 /* 298 * TCP attaches to socket via PRU_ATTACH, reserving space, 299 * and an internet control block. 300 */ 301 case PRU_ATTACH: 302 #ifndef INET6 303 if (inp != 0) 304 #else 305 if (inp != 0 || in6p != 0) 306 #endif 307 { 308 error = EISCONN; 309 break; 310 } 311 error = tcp_attach(so); 312 if (error) 313 break; 314 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 315 so->so_linger = TCP_LINGERTIME; 316 tp = sototcpcb(so); 317 break; 318 319 /* 320 * PRU_DETACH detaches the TCP protocol from the socket. 321 */ 322 case PRU_DETACH: 323 tp = tcp_disconnect(tp); 324 break; 325 326 /* 327 * Give the socket an address. 328 */ 329 case PRU_BIND: 330 switch (family) { 331 #ifdef INET 332 case PF_INET: 333 error = in_pcbbind(inp, nam, p); 334 break; 335 #endif 336 #ifdef INET6 337 case PF_INET6: 338 error = in6_pcbbind(in6p, nam, p); 339 if (!error) { 340 /* mapped addr case */ 341 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) 342 tp->t_family = AF_INET; 343 else 344 tp->t_family = AF_INET6; 345 } 346 break; 347 #endif 348 } 349 break; 350 351 /* 352 * Prepare to accept connections. 353 */ 354 case PRU_LISTEN: 355 #ifdef INET 356 if (inp && inp->inp_lport == 0) { 357 error = in_pcbbind(inp, (struct mbuf *)0, 358 (struct proc *)0); 359 if (error) 360 break; 361 } 362 #endif 363 #ifdef INET6 364 if (in6p && in6p->in6p_lport == 0) { 365 error = in6_pcbbind(in6p, (struct mbuf *)0, 366 (struct proc *)0); 367 if (error) 368 break; 369 } 370 #endif 371 tp->t_state = TCPS_LISTEN; 372 break; 373 374 /* 375 * Initiate connection to peer. 376 * Create a template for use in transmissions on this connection. 377 * Enter SYN_SENT state, and mark socket as connecting. 378 * Start keep-alive timer, and seed output sequence space. 379 * Send initial segment on connection. 380 */ 381 case PRU_CONNECT: 382 #ifdef INET 383 if (inp) { 384 if (inp->inp_lport == 0) { 385 error = in_pcbbind(inp, (struct mbuf *)0, 386 (struct proc *)0); 387 if (error) 388 break; 389 } 390 error = in_pcbconnect(inp, nam, p); 391 } 392 #endif 393 #ifdef INET6 394 if (in6p) { 395 if (in6p->in6p_lport == 0) { 396 error = in6_pcbbind(in6p, (struct mbuf *)0, 397 (struct proc *)0); 398 if (error) 399 break; 400 } 401 error = in6_pcbconnect(in6p, nam, p); 402 if (!error) { 403 /* mapped addr case */ 404 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) 405 tp->t_family = AF_INET; 406 else 407 tp->t_family = AF_INET6; 408 } 409 } 410 #endif 411 if (error) 412 break; 413 tp->t_template = tcp_template(tp); 414 if (tp->t_template == 0) { 415 #ifdef INET 416 if (inp) 417 in_pcbdisconnect(inp); 418 #endif 419 #ifdef INET6 420 if (in6p) 421 in6_pcbdisconnect(in6p); 422 #endif 423 error = ENOBUFS; 424 break; 425 } 426 /* Compute window scaling to request. */ 427 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 428 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat) 429 tp->request_r_scale++; 430 soisconnecting(so); 431 tcpstat.tcps_connattempt++; 432 tp->t_state = TCPS_SYN_SENT; 433 TCP_TIMER_ARM(tp, TCPT_KEEP, TCPTV_KEEP_INIT); 434 tp->iss = tcp_new_iss(tp, 0); 435 tcp_sendseqinit(tp); 436 error = tcp_output(tp); 437 break; 438 439 /* 440 * Create a TCP connection between two sockets. 441 */ 442 case PRU_CONNECT2: 443 error = EOPNOTSUPP; 444 break; 445 446 /* 447 * Initiate disconnect from peer. 448 * If connection never passed embryonic stage, just drop; 449 * else if don't need to let data drain, then can just drop anyways, 450 * else have to begin TCP shutdown process: mark socket disconnecting, 451 * drain unread data, state switch to reflect user close, and 452 * send segment (e.g. FIN) to peer. Socket will be really disconnected 453 * when peer sends FIN and acks ours. 454 * 455 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 456 */ 457 case PRU_DISCONNECT: 458 tp = tcp_disconnect(tp); 459 break; 460 461 /* 462 * Accept a connection. Essentially all the work is 463 * done at higher levels; just return the address 464 * of the peer, storing through addr. 465 */ 466 case PRU_ACCEPT: 467 #ifdef INET 468 if (inp) 469 in_setpeeraddr(inp, nam); 470 #endif 471 #ifdef INET6 472 if (in6p) 473 in6_setpeeraddr(in6p, nam); 474 #endif 475 break; 476 477 /* 478 * Mark the connection as being incapable of further output. 479 */ 480 case PRU_SHUTDOWN: 481 socantsendmore(so); 482 tp = tcp_usrclosed(tp); 483 if (tp) 484 error = tcp_output(tp); 485 break; 486 487 /* 488 * After a receive, possibly send window update to peer. 489 */ 490 case PRU_RCVD: 491 /* 492 * soreceive() calls this function when a user receives 493 * ancillary data on a listening socket. We don't call 494 * tcp_output in such a case, since there is no header 495 * template for a listening socket and hence the kernel 496 * will panic. 497 */ 498 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) != 0) 499 (void) tcp_output(tp); 500 break; 501 502 /* 503 * Do a send by putting data in output queue and updating urgent 504 * marker if URG set. Possibly send more data. 505 */ 506 case PRU_SEND: 507 if (control && control->m_len) { 508 m_freem(control); 509 m_freem(m); 510 error = EINVAL; 511 break; 512 } 513 sbappendstream(&so->so_snd, m); 514 error = tcp_output(tp); 515 break; 516 517 /* 518 * Abort the TCP. 519 */ 520 case PRU_ABORT: 521 tp = tcp_drop(tp, ECONNABORTED); 522 break; 523 524 case PRU_SENSE: 525 /* 526 * stat: don't bother with a blocksize. 527 */ 528 splx(s); 529 return (0); 530 531 case PRU_RCVOOB: 532 if (control && control->m_len) { 533 m_freem(control); 534 m_freem(m); 535 error = EINVAL; 536 break; 537 } 538 if ((so->so_oobmark == 0 && 539 (so->so_state & SS_RCVATMARK) == 0) || 540 so->so_options & SO_OOBINLINE || 541 tp->t_oobflags & TCPOOB_HADDATA) { 542 error = EINVAL; 543 break; 544 } 545 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 546 error = EWOULDBLOCK; 547 break; 548 } 549 m->m_len = 1; 550 *mtod(m, caddr_t) = tp->t_iobc; 551 if (((long)nam & MSG_PEEK) == 0) 552 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 553 break; 554 555 case PRU_SENDOOB: 556 if (sbspace(&so->so_snd) < -512) { 557 m_freem(m); 558 error = ENOBUFS; 559 break; 560 } 561 /* 562 * According to RFC961 (Assigned Protocols), 563 * the urgent pointer points to the last octet 564 * of urgent data. We continue, however, 565 * to consider it to indicate the first octet 566 * of data past the urgent section. 567 * Otherwise, snd_up should be one lower. 568 */ 569 sbappendstream(&so->so_snd, m); 570 tp->snd_up = tp->snd_una + so->so_snd.sb_cc; 571 tp->t_force = 1; 572 error = tcp_output(tp); 573 tp->t_force = 0; 574 break; 575 576 case PRU_SOCKADDR: 577 #ifdef INET 578 if (inp) 579 in_setsockaddr(inp, nam); 580 #endif 581 #ifdef INET6 582 if (in6p) 583 in6_setsockaddr(in6p, nam); 584 #endif 585 break; 586 587 case PRU_PEERADDR: 588 #ifdef INET 589 if (inp) 590 in_setpeeraddr(inp, nam); 591 #endif 592 #ifdef INET6 593 if (in6p) 594 in6_setpeeraddr(in6p, nam); 595 #endif 596 break; 597 598 default: 599 panic("tcp_usrreq"); 600 } 601 #ifdef TCP_DEBUG 602 if (tp && (so->so_options & SO_DEBUG)) 603 tcp_trace(TA_USER, ostate, tp, NULL, req); 604 #endif 605 606 release: 607 splx(s); 608 return (error); 609 } 610 611 int 612 tcp_ctloutput(int op, struct socket *so, int level, int optname, 613 struct mbuf **mp) 614 { 615 int error = 0, s; 616 struct inpcb *inp; 617 #ifdef INET6 618 struct in6pcb *in6p; 619 #endif 620 struct tcpcb *tp; 621 struct mbuf *m; 622 int i; 623 int family; /* family of the socket */ 624 625 family = so->so_proto->pr_domain->dom_family; 626 627 s = splsoftnet(); 628 switch (family) { 629 #ifdef INET 630 case PF_INET: 631 inp = sotoinpcb(so); 632 #ifdef INET6 633 in6p = NULL; 634 #endif 635 break; 636 #endif 637 #ifdef INET6 638 case PF_INET6: 639 inp = NULL; 640 in6p = sotoin6pcb(so); 641 break; 642 #endif 643 default: 644 splx(s); 645 return EAFNOSUPPORT; 646 } 647 #ifndef INET6 648 if (inp == NULL) 649 #else 650 if (inp == NULL && in6p == NULL) 651 #endif 652 { 653 splx(s); 654 if (op == PRCO_SETOPT && *mp) 655 (void) m_free(*mp); 656 return (ECONNRESET); 657 } 658 if (level != IPPROTO_TCP) { 659 switch (family) { 660 #ifdef INET 661 case PF_INET: 662 error = ip_ctloutput(op, so, level, optname, mp); 663 break; 664 #endif 665 #ifdef INET6 666 case PF_INET6: 667 error = ip6_ctloutput(op, so, level, optname, mp); 668 break; 669 #endif 670 } 671 splx(s); 672 return (error); 673 } 674 if (inp) 675 tp = intotcpcb(inp); 676 #ifdef INET6 677 else if (in6p) 678 tp = in6totcpcb(in6p); 679 #endif 680 else 681 tp = NULL; 682 683 switch (op) { 684 685 case PRCO_SETOPT: 686 m = *mp; 687 switch (optname) { 688 689 #ifdef TCP_SIGNATURE 690 case TCP_MD5SIG: 691 if (m == NULL || m->m_len < sizeof (int)) 692 error = EINVAL; 693 if (error) 694 break; 695 if (*mtod(m, int *) > 0) 696 tp->t_flags |= TF_SIGNATURE; 697 else 698 tp->t_flags &= ~TF_SIGNATURE; 699 break; 700 #endif /* TCP_SIGNATURE */ 701 702 case TCP_NODELAY: 703 if (m == NULL || m->m_len < sizeof (int)) 704 error = EINVAL; 705 else if (*mtod(m, int *)) 706 tp->t_flags |= TF_NODELAY; 707 else 708 tp->t_flags &= ~TF_NODELAY; 709 break; 710 711 case TCP_MAXSEG: 712 if (m && (i = *mtod(m, int *)) > 0 && 713 i <= tp->t_peermss) 714 tp->t_peermss = i; /* limit on send size */ 715 else 716 error = EINVAL; 717 break; 718 719 default: 720 error = ENOPROTOOPT; 721 break; 722 } 723 if (m) 724 (void) m_free(m); 725 break; 726 727 case PRCO_GETOPT: 728 *mp = m = m_get(M_WAIT, MT_SOOPTS); 729 m->m_len = sizeof(int); 730 MCLAIM(m, so->so_mowner); 731 732 switch (optname) { 733 #ifdef TCP_SIGNATURE 734 case TCP_MD5SIG: 735 *mtod(m, int *) = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; 736 break; 737 #endif 738 case TCP_NODELAY: 739 *mtod(m, int *) = tp->t_flags & TF_NODELAY; 740 break; 741 case TCP_MAXSEG: 742 *mtod(m, int *) = tp->t_peermss; 743 break; 744 default: 745 error = ENOPROTOOPT; 746 break; 747 } 748 break; 749 } 750 splx(s); 751 return (error); 752 } 753 754 #ifndef TCP_SENDSPACE 755 #define TCP_SENDSPACE 1024*32 756 #endif 757 int tcp_sendspace = TCP_SENDSPACE; 758 #ifndef TCP_RECVSPACE 759 #define TCP_RECVSPACE 1024*32 760 #endif 761 int tcp_recvspace = TCP_RECVSPACE; 762 763 /* 764 * Attach TCP protocol to socket, allocating 765 * internet protocol control block, tcp control block, 766 * bufer space, and entering LISTEN state if to accept connections. 767 */ 768 int 769 tcp_attach(struct socket *so) 770 { 771 struct tcpcb *tp; 772 struct inpcb *inp; 773 #ifdef INET6 774 struct in6pcb *in6p; 775 #endif 776 int error; 777 int family; /* family of the socket */ 778 779 family = so->so_proto->pr_domain->dom_family; 780 781 #ifdef MBUFTRACE 782 so->so_mowner = &tcp_mowner; 783 so->so_rcv.sb_mowner = &tcp_rx_mowner; 784 so->so_snd.sb_mowner = &tcp_tx_mowner; 785 #endif 786 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 787 error = soreserve(so, tcp_sendspace, tcp_recvspace); 788 if (error) 789 return (error); 790 } 791 switch (family) { 792 #ifdef INET 793 case PF_INET: 794 error = in_pcballoc(so, &tcbtable); 795 if (error) 796 return (error); 797 inp = sotoinpcb(so); 798 #ifdef INET6 799 in6p = NULL; 800 #endif 801 break; 802 #endif 803 #ifdef INET6 804 case PF_INET6: 805 error = in6_pcballoc(so, &tcbtable); 806 if (error) 807 return (error); 808 inp = NULL; 809 in6p = sotoin6pcb(so); 810 break; 811 #endif 812 default: 813 return EAFNOSUPPORT; 814 } 815 if (inp) 816 tp = tcp_newtcpcb(family, (void *)inp); 817 #ifdef INET6 818 else if (in6p) 819 tp = tcp_newtcpcb(family, (void *)in6p); 820 #endif 821 else 822 tp = NULL; 823 824 if (tp == 0) { 825 int nofd = so->so_state & SS_NOFDREF; /* XXX */ 826 827 so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */ 828 #ifdef INET 829 if (inp) 830 in_pcbdetach(inp); 831 #endif 832 #ifdef INET6 833 if (in6p) 834 in6_pcbdetach(in6p); 835 #endif 836 so->so_state |= nofd; 837 return (ENOBUFS); 838 } 839 tp->t_state = TCPS_CLOSED; 840 return (0); 841 } 842 843 /* 844 * Initiate (or continue) disconnect. 845 * If embryonic state, just send reset (once). 846 * If in ``let data drain'' option and linger null, just drop. 847 * Otherwise (hard), mark socket disconnecting and drop 848 * current input data; switch states based on user close, and 849 * send segment to peer (with FIN). 850 */ 851 struct tcpcb * 852 tcp_disconnect(struct tcpcb *tp) 853 { 854 struct socket *so; 855 856 if (tp->t_inpcb) 857 so = tp->t_inpcb->inp_socket; 858 #ifdef INET6 859 else if (tp->t_in6pcb) 860 so = tp->t_in6pcb->in6p_socket; 861 #endif 862 else 863 so = NULL; 864 865 if (TCPS_HAVEESTABLISHED(tp->t_state) == 0) 866 tp = tcp_close(tp); 867 else if ((so->so_options & SO_LINGER) && so->so_linger == 0) 868 tp = tcp_drop(tp, 0); 869 else { 870 soisdisconnecting(so); 871 sbflush(&so->so_rcv); 872 tp = tcp_usrclosed(tp); 873 if (tp) 874 (void) tcp_output(tp); 875 } 876 return (tp); 877 } 878 879 /* 880 * User issued close, and wish to trail through shutdown states: 881 * if never received SYN, just forget it. If got a SYN from peer, 882 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 883 * If already got a FIN from peer, then almost done; go to LAST_ACK 884 * state. In all other cases, have already sent FIN to peer (e.g. 885 * after PRU_SHUTDOWN), and just have to play tedious game waiting 886 * for peer to send FIN or not respond to keep-alives, etc. 887 * We can let the user exit from the close as soon as the FIN is acked. 888 */ 889 struct tcpcb * 890 tcp_usrclosed(struct tcpcb *tp) 891 { 892 893 switch (tp->t_state) { 894 895 case TCPS_CLOSED: 896 case TCPS_LISTEN: 897 case TCPS_SYN_SENT: 898 tp->t_state = TCPS_CLOSED; 899 tp = tcp_close(tp); 900 break; 901 902 case TCPS_SYN_RECEIVED: 903 case TCPS_ESTABLISHED: 904 tp->t_state = TCPS_FIN_WAIT_1; 905 break; 906 907 case TCPS_CLOSE_WAIT: 908 tp->t_state = TCPS_LAST_ACK; 909 break; 910 } 911 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) { 912 struct socket *so; 913 if (tp->t_inpcb) 914 so = tp->t_inpcb->inp_socket; 915 #ifdef INET6 916 else if (tp->t_in6pcb) 917 so = tp->t_in6pcb->in6p_socket; 918 #endif 919 else 920 so = NULL; 921 soisdisconnected(so); 922 /* 923 * If we are in FIN_WAIT_2, we arrived here because the 924 * application did a shutdown of the send side. Like the 925 * case of a transition from FIN_WAIT_1 to FIN_WAIT_2 after 926 * a full close, we start a timer to make sure sockets are 927 * not left in FIN_WAIT_2 forever. 928 */ 929 if ((tp->t_state == TCPS_FIN_WAIT_2) && (tcp_maxidle > 0)) 930 TCP_TIMER_ARM(tp, TCPT_2MSL, tcp_maxidle); 931 } 932 return (tp); 933 } 934 935 /* 936 * sysctl helper routine for net.inet.ip.mssdflt. it can't be less 937 * than 32. 938 */ 939 static int 940 sysctl_net_inet_tcp_mssdflt(SYSCTLFN_ARGS) 941 { 942 int error, mssdflt; 943 struct sysctlnode node; 944 945 mssdflt = tcp_mssdflt; 946 node = *rnode; 947 node.sysctl_data = &mssdflt; 948 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 949 if (error || newp == NULL) 950 return (error); 951 952 if (mssdflt < 32) 953 return (EINVAL); 954 tcp_mssdflt = mssdflt; 955 956 return (0); 957 } 958 959 /* 960 * sysctl helper routine for setting port related values under 961 * net.inet.ip and net.inet6.ip6. does basic range checking and does 962 * additional checks for each type. this code has placed in 963 * tcp_input.c since INET and INET6 both use the same tcp code. 964 * 965 * this helper is not static so that both inet and inet6 can use it. 966 */ 967 int 968 sysctl_net_inet_ip_ports(SYSCTLFN_ARGS) 969 { 970 int error, tmp; 971 int apmin, apmax; 972 #ifndef IPNOPRIVPORTS 973 int lpmin, lpmax; 974 #endif /* IPNOPRIVPORTS */ 975 struct sysctlnode node; 976 977 if (namelen != 0) 978 return (EINVAL); 979 980 switch (name[-3]) { 981 #ifdef INET 982 case PF_INET: 983 apmin = anonportmin; 984 apmax = anonportmax; 985 #ifndef IPNOPRIVPORTS 986 lpmin = lowportmin; 987 lpmax = lowportmax; 988 #endif /* IPNOPRIVPORTS */ 989 break; 990 #endif /* INET */ 991 #ifdef INET6 992 case PF_INET6: 993 apmin = ip6_anonportmin; 994 apmax = ip6_anonportmax; 995 #ifndef IPNOPRIVPORTS 996 lpmin = ip6_lowportmin; 997 lpmax = ip6_lowportmax; 998 #endif /* IPNOPRIVPORTS */ 999 break; 1000 #endif /* INET6 */ 1001 default: 1002 return (EINVAL); 1003 } 1004 1005 /* 1006 * insert temporary copy into node, perform lookup on 1007 * temporary, then restore pointer 1008 */ 1009 node = *rnode; 1010 tmp = *(int*)rnode->sysctl_data; 1011 node.sysctl_data = &tmp; 1012 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1013 if (error || newp == NULL) 1014 return (error); 1015 1016 /* 1017 * simple port range check 1018 */ 1019 if (tmp < 0 || tmp > 65535) 1020 return (EINVAL); 1021 1022 /* 1023 * per-node range checks 1024 */ 1025 switch (rnode->sysctl_num) { 1026 case IPCTL_ANONPORTMIN: 1027 if (tmp >= apmax) 1028 return (EINVAL); 1029 #ifndef IPNOPRIVPORTS 1030 if (tmp < IPPORT_RESERVED) 1031 return (EINVAL); 1032 #endif /* IPNOPRIVPORTS */ 1033 break; 1034 1035 case IPCTL_ANONPORTMAX: 1036 if (apmin >= tmp) 1037 return (EINVAL); 1038 #ifndef IPNOPRIVPORTS 1039 if (tmp < IPPORT_RESERVED) 1040 return (EINVAL); 1041 #endif /* IPNOPRIVPORTS */ 1042 break; 1043 1044 #ifndef IPNOPRIVPORTS 1045 case IPCTL_LOWPORTMIN: 1046 if (tmp >= lpmax || 1047 tmp > IPPORT_RESERVEDMAX || 1048 tmp < IPPORT_RESERVEDMIN) 1049 return (EINVAL); 1050 break; 1051 1052 case IPCTL_LOWPORTMAX: 1053 if (lpmin >= tmp || 1054 tmp > IPPORT_RESERVEDMAX || 1055 tmp < IPPORT_RESERVEDMIN) 1056 return (EINVAL); 1057 break; 1058 #endif /* IPNOPRIVPORTS */ 1059 1060 default: 1061 return (EINVAL); 1062 } 1063 1064 *(int*)rnode->sysctl_data = tmp; 1065 1066 return (0); 1067 } 1068 1069 /* 1070 * sysctl helper routine for the net.inet.tcp.ident and 1071 * net.inet6.tcp6.ident nodes. contains backwards compat code for the 1072 * old way of looking up the ident information for ipv4 which involves 1073 * stuffing the port/addr pairs into the mib lookup. 1074 */ 1075 static int 1076 sysctl_net_inet_tcp_ident(SYSCTLFN_ARGS) 1077 { 1078 #ifdef INET 1079 struct inpcb *inb; 1080 struct sockaddr_in *si4[2]; 1081 #endif /* INET */ 1082 #ifdef INET6 1083 struct in6pcb *in6b; 1084 struct sockaddr_in6 *si6[2]; 1085 #endif /* INET6 */ 1086 struct sockaddr_storage sa[2]; 1087 struct socket *sockp; 1088 size_t sz; 1089 uid_t uid; 1090 int error, pf; 1091 1092 if (namelen != 4 && namelen != 0) 1093 return (EINVAL); 1094 if (name[-2] != IPPROTO_TCP) 1095 return (EINVAL); 1096 pf = name[-3]; 1097 1098 /* old style lookup, ipv4 only */ 1099 if (namelen == 4) { 1100 #ifdef INET 1101 struct in_addr laddr, raddr; 1102 u_int lport, rport; 1103 1104 if (pf != PF_INET) 1105 return (EPROTONOSUPPORT); 1106 raddr.s_addr = (uint32_t)name[0]; 1107 rport = (u_int)name[1]; 1108 laddr.s_addr = (uint32_t)name[2]; 1109 lport = (u_int)name[3]; 1110 inb = in_pcblookup_connect(&tcbtable, raddr, rport, 1111 laddr, lport); 1112 if (inb == NULL || (sockp = inb->inp_socket) == NULL) 1113 return (ESRCH); 1114 uid = sockp->so_uidinfo->ui_uid; 1115 if (oldp) { 1116 sz = MIN(sizeof(uid), *oldlenp); 1117 error = copyout(&uid, oldp, sz); 1118 if (error) 1119 return (error); 1120 } 1121 *oldlenp = sizeof(uid); 1122 return (0); 1123 #else /* INET */ 1124 return (EINVAL); 1125 #endif /* INET */ 1126 } 1127 1128 if (newp == NULL || newlen != sizeof(sa)) 1129 return (EINVAL); 1130 error = copyin(newp, &sa, newlen); 1131 if (error) 1132 return (error); 1133 1134 /* 1135 * requested families must match 1136 */ 1137 if (pf != sa[0].ss_family || sa[0].ss_family != sa[1].ss_family) 1138 return (EINVAL); 1139 1140 switch (pf) { 1141 #ifdef INET 1142 case PF_INET: 1143 si4[0] = (struct sockaddr_in*)&sa[0]; 1144 si4[1] = (struct sockaddr_in*)&sa[1]; 1145 if (si4[0]->sin_len != sizeof(*si4[0]) || 1146 si4[0]->sin_len != si4[1]->sin_len) 1147 return (EINVAL); 1148 inb = in_pcblookup_connect(&tcbtable, 1149 si4[0]->sin_addr, si4[0]->sin_port, 1150 si4[1]->sin_addr, si4[1]->sin_port); 1151 if (inb == NULL || (sockp = inb->inp_socket) == NULL) 1152 return (ESRCH); 1153 break; 1154 #endif /* INET */ 1155 #ifdef INET6 1156 case PF_INET6: 1157 si6[0] = (struct sockaddr_in6*)&sa[0]; 1158 si6[1] = (struct sockaddr_in6*)&sa[1]; 1159 if (si6[0]->sin6_len != sizeof(*si6[0]) || 1160 si6[0]->sin6_len != si6[1]->sin6_len) 1161 return (EINVAL); 1162 in6b = in6_pcblookup_connect(&tcbtable, 1163 &si6[0]->sin6_addr, si6[0]->sin6_port, 1164 &si6[1]->sin6_addr, si6[1]->sin6_port, 0); 1165 if (in6b == NULL || (sockp = in6b->in6p_socket) == NULL) 1166 return (ESRCH); 1167 break; 1168 #endif /* INET6 */ 1169 default: 1170 return (EPROTONOSUPPORT); 1171 } 1172 *oldlenp = sizeof(uid); 1173 1174 uid = sockp->so_uidinfo->ui_uid; 1175 if (oldp) { 1176 sz = MIN(sizeof(uid), *oldlenp); 1177 error = copyout(&uid, oldp, sz); 1178 if (error) 1179 return (error); 1180 } 1181 *oldlenp = sizeof(uid); 1182 1183 return (0); 1184 } 1185 1186 /* 1187 * sysctl helper for the inet and inet6 pcblists. handles tcp/udp and 1188 * inet/inet6, as well as raw pcbs for each. specifically not 1189 * declared static so that raw sockets and udp/udp6 can use it as 1190 * well. 1191 */ 1192 int 1193 sysctl_inpcblist(SYSCTLFN_ARGS) 1194 { 1195 #ifdef INET 1196 struct sockaddr_in *in; 1197 const struct inpcb *inp; 1198 #endif 1199 #ifdef INET6 1200 struct sockaddr_in6 *in6; 1201 const struct in6pcb *in6p; 1202 #endif 1203 /* 1204 * sysctl_data is const, but CIRCLEQ_FOREACH can't use a const 1205 * struct inpcbtable pointer, so we have to discard const. :-/ 1206 */ 1207 struct inpcbtable *pcbtbl = __UNCONST(rnode->sysctl_data); 1208 const struct inpcb_hdr *inph; 1209 struct tcpcb *tp; 1210 struct kinfo_pcb pcb; 1211 char *dp; 1212 u_int op, arg; 1213 size_t len, needed, elem_size, out_size; 1214 int error, elem_count, pf, proto, pf2; 1215 1216 if (namelen != 4) 1217 return (EINVAL); 1218 1219 error = 0; 1220 dp = oldp; 1221 len = (oldp != NULL) ? *oldlenp : 0; 1222 op = name[0]; 1223 arg = name[1]; 1224 elem_size = name[2]; 1225 elem_count = name[3]; 1226 out_size = MIN(sizeof(pcb), elem_size); 1227 needed = 0; 1228 1229 elem_count = INT_MAX; 1230 elem_size = out_size = sizeof(pcb); 1231 1232 if (namelen == 1 && name[0] == CTL_QUERY) 1233 return (sysctl_query(SYSCTLFN_CALL(rnode))); 1234 1235 if (name - oname != 4) 1236 return (EINVAL); 1237 1238 pf = oname[1]; 1239 proto = oname[2]; 1240 pf2 = (oldp == NULL) ? 0 : pf; 1241 1242 CIRCLEQ_FOREACH(inph, &pcbtbl->inpt_queue, inph_queue) { 1243 #ifdef INET 1244 inp = (const struct inpcb *)inph; 1245 #endif 1246 #ifdef INET6 1247 in6p = (const struct in6pcb *)inph; 1248 #endif 1249 1250 if (inph->inph_af != pf) 1251 continue; 1252 1253 if (CURTAIN(l->l_proc->p_ucred->cr_uid, 1254 inph->inph_socket->so_uidinfo->ui_uid)) 1255 continue; 1256 1257 memset(&pcb, 0, sizeof(pcb)); 1258 1259 pcb.ki_family = pf; 1260 pcb.ki_type = proto; 1261 1262 switch (pf2) { 1263 case 0: 1264 /* just probing for size */ 1265 break; 1266 #ifdef INET 1267 case PF_INET: 1268 pcb.ki_family = inp->inp_socket->so_proto-> 1269 pr_domain->dom_family; 1270 pcb.ki_type = inp->inp_socket->so_proto-> 1271 pr_type; 1272 pcb.ki_protocol = inp->inp_socket->so_proto-> 1273 pr_protocol; 1274 pcb.ki_pflags = inp->inp_flags; 1275 1276 pcb.ki_sostate = inp->inp_socket->so_state; 1277 pcb.ki_prstate = inp->inp_state; 1278 if (proto == IPPROTO_TCP) { 1279 tp = intotcpcb(inp); 1280 pcb.ki_tstate = tp->t_state; 1281 pcb.ki_tflags = tp->t_flags; 1282 } 1283 1284 pcb.ki_pcbaddr = PTRTOUINT64(inp); 1285 pcb.ki_ppcbaddr = PTRTOUINT64(inp->inp_ppcb); 1286 pcb.ki_sockaddr = PTRTOUINT64(inp->inp_socket); 1287 1288 pcb.ki_rcvq = inp->inp_socket->so_rcv.sb_cc; 1289 pcb.ki_sndq = inp->inp_socket->so_snd.sb_cc; 1290 1291 in = satosin(&pcb.ki_src); 1292 in->sin_len = sizeof(*in); 1293 in->sin_family = pf; 1294 in->sin_port = inp->inp_lport; 1295 in->sin_addr = inp->inp_laddr; 1296 if (pcb.ki_prstate >= INP_CONNECTED) { 1297 in = satosin(&pcb.ki_dst); 1298 in->sin_len = sizeof(*in); 1299 in->sin_family = pf; 1300 in->sin_port = inp->inp_fport; 1301 in->sin_addr = inp->inp_faddr; 1302 } 1303 break; 1304 #endif 1305 #ifdef INET6 1306 case PF_INET6: 1307 pcb.ki_family = in6p->in6p_socket->so_proto-> 1308 pr_domain->dom_family; 1309 pcb.ki_type = in6p->in6p_socket->so_proto->pr_type; 1310 pcb.ki_protocol = in6p->in6p_socket->so_proto-> 1311 pr_protocol; 1312 pcb.ki_pflags = in6p->in6p_flags; 1313 1314 pcb.ki_sostate = in6p->in6p_socket->so_state; 1315 pcb.ki_prstate = in6p->in6p_state; 1316 if (proto == IPPROTO_TCP) { 1317 tp = in6totcpcb(in6p); 1318 pcb.ki_tstate = tp->t_state; 1319 pcb.ki_tflags = tp->t_flags; 1320 } 1321 1322 pcb.ki_pcbaddr = PTRTOUINT64(in6p); 1323 pcb.ki_ppcbaddr = PTRTOUINT64(in6p->in6p_ppcb); 1324 pcb.ki_sockaddr = PTRTOUINT64(in6p->in6p_socket); 1325 1326 pcb.ki_rcvq = in6p->in6p_socket->so_rcv.sb_cc; 1327 pcb.ki_sndq = in6p->in6p_socket->so_snd.sb_cc; 1328 1329 in6 = satosin6(&pcb.ki_src); 1330 in6->sin6_len = sizeof(*in6); 1331 in6->sin6_family = pf; 1332 in6->sin6_port = in6p->in6p_lport; 1333 in6->sin6_flowinfo = in6p->in6p_flowinfo; 1334 in6->sin6_addr = in6p->in6p_laddr; 1335 in6->sin6_scope_id = 0; /* XXX? */ 1336 1337 if (pcb.ki_prstate >= IN6P_CONNECTED) { 1338 in6 = satosin6(&pcb.ki_dst); 1339 in6->sin6_len = sizeof(*in6); 1340 in6->sin6_family = pf; 1341 in6->sin6_port = in6p->in6p_fport; 1342 in6->sin6_flowinfo = in6p->in6p_flowinfo; 1343 in6->sin6_addr = in6p->in6p_faddr; 1344 in6->sin6_scope_id = 0; /* XXX? */ 1345 } 1346 break; 1347 #endif 1348 } 1349 1350 if (len >= elem_size && elem_count > 0) { 1351 error = copyout(&pcb, dp, out_size); 1352 if (error) 1353 return (error); 1354 dp += elem_size; 1355 len -= elem_size; 1356 } 1357 if (elem_count > 0) { 1358 needed += elem_size; 1359 if (elem_count != INT_MAX) 1360 elem_count--; 1361 } 1362 } 1363 1364 *oldlenp = needed; 1365 if (oldp == NULL) 1366 *oldlenp += PCB_SLOP * sizeof(struct kinfo_pcb); 1367 1368 return (error); 1369 } 1370 1371 /* 1372 * this (second stage) setup routine is a replacement for tcp_sysctl() 1373 * (which is currently used for ipv4 and ipv6) 1374 */ 1375 static void 1376 sysctl_net_inet_tcp_setup2(struct sysctllog **clog, int pf, const char *pfname, 1377 const char *tcpname) 1378 { 1379 const struct sysctlnode *sack_node; 1380 #ifdef TCP_DEBUG 1381 extern struct tcp_debug tcp_debug[TCP_NDEBUG]; 1382 extern int tcp_debx; 1383 #endif 1384 1385 sysctl_createv(clog, 0, NULL, NULL, 1386 CTLFLAG_PERMANENT, 1387 CTLTYPE_NODE, "net", NULL, 1388 NULL, 0, NULL, 0, 1389 CTL_NET, CTL_EOL); 1390 sysctl_createv(clog, 0, NULL, NULL, 1391 CTLFLAG_PERMANENT, 1392 CTLTYPE_NODE, pfname, NULL, 1393 NULL, 0, NULL, 0, 1394 CTL_NET, pf, CTL_EOL); 1395 sysctl_createv(clog, 0, NULL, NULL, 1396 CTLFLAG_PERMANENT, 1397 CTLTYPE_NODE, tcpname, 1398 SYSCTL_DESCR("TCP related settings"), 1399 NULL, 0, NULL, 0, 1400 CTL_NET, pf, IPPROTO_TCP, CTL_EOL); 1401 1402 sysctl_createv(clog, 0, NULL, NULL, 1403 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1404 CTLTYPE_INT, "rfc1323", 1405 SYSCTL_DESCR("Enable RFC1323 TCP extensions"), 1406 NULL, 0, &tcp_do_rfc1323, 0, 1407 CTL_NET, pf, IPPROTO_TCP, TCPCTL_RFC1323, CTL_EOL); 1408 sysctl_createv(clog, 0, NULL, NULL, 1409 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1410 CTLTYPE_INT, "sendspace", 1411 SYSCTL_DESCR("Default TCP send buffer size"), 1412 NULL, 0, &tcp_sendspace, 0, 1413 CTL_NET, pf, IPPROTO_TCP, TCPCTL_SENDSPACE, CTL_EOL); 1414 sysctl_createv(clog, 0, NULL, NULL, 1415 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1416 CTLTYPE_INT, "recvspace", 1417 SYSCTL_DESCR("Default TCP receive buffer size"), 1418 NULL, 0, &tcp_recvspace, 0, 1419 CTL_NET, pf, IPPROTO_TCP, TCPCTL_RECVSPACE, CTL_EOL); 1420 sysctl_createv(clog, 0, NULL, NULL, 1421 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1422 CTLTYPE_INT, "mssdflt", 1423 SYSCTL_DESCR("Default maximum segment size"), 1424 sysctl_net_inet_tcp_mssdflt, 0, &tcp_mssdflt, 0, 1425 CTL_NET, pf, IPPROTO_TCP, TCPCTL_MSSDFLT, CTL_EOL); 1426 sysctl_createv(clog, 0, NULL, NULL, 1427 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1428 CTLTYPE_INT, "syn_cache_limit", 1429 SYSCTL_DESCR("Maximum number of entries in the TCP " 1430 "compressed state engine"), 1431 NULL, 0, &tcp_syn_cache_limit, 0, 1432 CTL_NET, pf, IPPROTO_TCP, TCPCTL_SYN_CACHE_LIMIT, 1433 CTL_EOL); 1434 sysctl_createv(clog, 0, NULL, NULL, 1435 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1436 CTLTYPE_INT, "syn_bucket_limit", 1437 SYSCTL_DESCR("Maximum number of entries per hash " 1438 "bucket in the TCP compressed state " 1439 "engine"), 1440 NULL, 0, &tcp_syn_bucket_limit, 0, 1441 CTL_NET, pf, IPPROTO_TCP, TCPCTL_SYN_BUCKET_LIMIT, 1442 CTL_EOL); 1443 #if 0 /* obsoleted */ 1444 sysctl_createv(clog, 0, NULL, NULL, 1445 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1446 CTLTYPE_INT, "syn_cache_interval", 1447 SYSCTL_DESCR("TCP compressed state engine's timer interval"), 1448 NULL, 0, &tcp_syn_cache_interval, 0, 1449 CTL_NET, pf, IPPROTO_TCP, TCPCTL_SYN_CACHE_INTER, 1450 CTL_EOL); 1451 #endif 1452 sysctl_createv(clog, 0, NULL, NULL, 1453 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1454 CTLTYPE_INT, "init_win", 1455 SYSCTL_DESCR("Initial TCP congestion window"), 1456 NULL, 0, &tcp_init_win, 0, 1457 CTL_NET, pf, IPPROTO_TCP, TCPCTL_INIT_WIN, CTL_EOL); 1458 sysctl_createv(clog, 0, NULL, NULL, 1459 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1460 CTLTYPE_INT, "mss_ifmtu", 1461 SYSCTL_DESCR("Use interface MTU for calculating MSS"), 1462 NULL, 0, &tcp_mss_ifmtu, 0, 1463 CTL_NET, pf, IPPROTO_TCP, TCPCTL_MSS_IFMTU, CTL_EOL); 1464 sysctl_createv(clog, 0, NULL, &sack_node, 1465 CTLFLAG_PERMANENT, 1466 CTLTYPE_NODE, "sack", 1467 SYSCTL_DESCR("RFC2018 Selective ACKnowledgement tunables"), 1468 NULL, 0, NULL, 0, 1469 CTL_NET, pf, IPPROTO_TCP, TCPCTL_SACK, CTL_EOL); 1470 sysctl_createv(clog, 0, NULL, NULL, 1471 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1472 CTLTYPE_INT, "win_scale", 1473 SYSCTL_DESCR("Use RFC1323 window scale options"), 1474 NULL, 0, &tcp_do_win_scale, 0, 1475 CTL_NET, pf, IPPROTO_TCP, TCPCTL_WSCALE, CTL_EOL); 1476 sysctl_createv(clog, 0, NULL, NULL, 1477 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1478 CTLTYPE_INT, "timestamps", 1479 SYSCTL_DESCR("Use RFC1323 time stamp options"), 1480 NULL, 0, &tcp_do_timestamps, 0, 1481 CTL_NET, pf, IPPROTO_TCP, TCPCTL_TSTAMP, CTL_EOL); 1482 sysctl_createv(clog, 0, NULL, NULL, 1483 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1484 CTLTYPE_INT, "compat_42", 1485 SYSCTL_DESCR("Enable workarounds for 4.2BSD TCP bugs"), 1486 NULL, 0, &tcp_compat_42, 0, 1487 CTL_NET, pf, IPPROTO_TCP, TCPCTL_COMPAT_42, CTL_EOL); 1488 sysctl_createv(clog, 0, NULL, NULL, 1489 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1490 CTLTYPE_INT, "cwm", 1491 SYSCTL_DESCR("Hughes/Touch/Heidemann Congestion Window " 1492 "Monitoring"), 1493 NULL, 0, &tcp_cwm, 0, 1494 CTL_NET, pf, IPPROTO_TCP, TCPCTL_CWM, CTL_EOL); 1495 sysctl_createv(clog, 0, NULL, NULL, 1496 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1497 CTLTYPE_INT, "cwm_burstsize", 1498 SYSCTL_DESCR("Congestion Window Monitoring allowed " 1499 "burst count in packets"), 1500 NULL, 0, &tcp_cwm_burstsize, 0, 1501 CTL_NET, pf, IPPROTO_TCP, TCPCTL_CWM_BURSTSIZE, 1502 CTL_EOL); 1503 sysctl_createv(clog, 0, NULL, NULL, 1504 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1505 CTLTYPE_INT, "ack_on_push", 1506 SYSCTL_DESCR("Immediately return ACK when PSH is " 1507 "received"), 1508 NULL, 0, &tcp_ack_on_push, 0, 1509 CTL_NET, pf, IPPROTO_TCP, TCPCTL_ACK_ON_PUSH, CTL_EOL); 1510 sysctl_createv(clog, 0, NULL, NULL, 1511 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1512 CTLTYPE_INT, "keepidle", 1513 SYSCTL_DESCR("Allowed connection idle ticks before a " 1514 "keepalive probe is sent"), 1515 NULL, 0, &tcp_keepidle, 0, 1516 CTL_NET, pf, IPPROTO_TCP, TCPCTL_KEEPIDLE, CTL_EOL); 1517 sysctl_createv(clog, 0, NULL, NULL, 1518 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1519 CTLTYPE_INT, "keepintvl", 1520 SYSCTL_DESCR("Ticks before next keepalive probe is sent"), 1521 NULL, 0, &tcp_keepintvl, 0, 1522 CTL_NET, pf, IPPROTO_TCP, TCPCTL_KEEPINTVL, CTL_EOL); 1523 sysctl_createv(clog, 0, NULL, NULL, 1524 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1525 CTLTYPE_INT, "keepcnt", 1526 SYSCTL_DESCR("Number of keepalive probes to send"), 1527 NULL, 0, &tcp_keepcnt, 0, 1528 CTL_NET, pf, IPPROTO_TCP, TCPCTL_KEEPCNT, CTL_EOL); 1529 sysctl_createv(clog, 0, NULL, NULL, 1530 CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE, 1531 CTLTYPE_INT, "slowhz", 1532 SYSCTL_DESCR("Keepalive ticks per second"), 1533 NULL, PR_SLOWHZ, NULL, 0, 1534 CTL_NET, pf, IPPROTO_TCP, TCPCTL_SLOWHZ, CTL_EOL); 1535 sysctl_createv(clog, 0, NULL, NULL, 1536 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1537 CTLTYPE_INT, "newreno", 1538 SYSCTL_DESCR("NewReno congestion control algorithm"), 1539 NULL, 0, &tcp_do_newreno, 0, 1540 CTL_NET, pf, IPPROTO_TCP, TCPCTL_NEWRENO, CTL_EOL); 1541 sysctl_createv(clog, 0, NULL, NULL, 1542 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1543 CTLTYPE_INT, "log_refused", 1544 SYSCTL_DESCR("Log refused TCP connections"), 1545 NULL, 0, &tcp_log_refused, 0, 1546 CTL_NET, pf, IPPROTO_TCP, TCPCTL_LOG_REFUSED, CTL_EOL); 1547 #if 0 /* obsoleted */ 1548 sysctl_createv(clog, 0, NULL, NULL, 1549 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1550 CTLTYPE_INT, "rstratelimit", NULL, 1551 NULL, 0, &tcp_rst_ratelim, 0, 1552 CTL_NET, pf, IPPROTO_TCP, TCPCTL_RSTRATELIMIT, CTL_EOL); 1553 #endif 1554 sysctl_createv(clog, 0, NULL, NULL, 1555 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1556 CTLTYPE_INT, "rstppslimit", 1557 SYSCTL_DESCR("Maximum number of RST packets to send " 1558 "per second"), 1559 NULL, 0, &tcp_rst_ppslim, 0, 1560 CTL_NET, pf, IPPROTO_TCP, TCPCTL_RSTPPSLIMIT, CTL_EOL); 1561 sysctl_createv(clog, 0, NULL, NULL, 1562 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1563 CTLTYPE_INT, "delack_ticks", 1564 SYSCTL_DESCR("Number of ticks to delay sending an ACK"), 1565 NULL, 0, &tcp_delack_ticks, 0, 1566 CTL_NET, pf, IPPROTO_TCP, TCPCTL_DELACK_TICKS, CTL_EOL); 1567 sysctl_createv(clog, 0, NULL, NULL, 1568 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1569 CTLTYPE_INT, "init_win_local", 1570 SYSCTL_DESCR("Initial TCP window size (in segments)"), 1571 NULL, 0, &tcp_init_win_local, 0, 1572 CTL_NET, pf, IPPROTO_TCP, TCPCTL_INIT_WIN_LOCAL, 1573 CTL_EOL); 1574 sysctl_createv(clog, 0, NULL, NULL, 1575 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1576 CTLTYPE_STRUCT, "ident", 1577 SYSCTL_DESCR("RFC1413 Identification Protocol lookups"), 1578 sysctl_net_inet_tcp_ident, 0, NULL, sizeof(uid_t), 1579 CTL_NET, pf, IPPROTO_TCP, TCPCTL_IDENT, CTL_EOL); 1580 sysctl_createv(clog, 0, NULL, NULL, 1581 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1582 CTLTYPE_INT, "do_loopback_cksum", 1583 SYSCTL_DESCR("Perform TCP checksum on loopback"), 1584 NULL, 0, &tcp_do_loopback_cksum, 0, 1585 CTL_NET, pf, IPPROTO_TCP, TCPCTL_LOOPBACKCKSUM, 1586 CTL_EOL); 1587 sysctl_createv(clog, 0, NULL, NULL, 1588 CTLFLAG_PERMANENT, 1589 CTLTYPE_STRUCT, "pcblist", 1590 SYSCTL_DESCR("TCP protocol control block list"), 1591 sysctl_inpcblist, 0, &tcbtable, 0, 1592 CTL_NET, pf, IPPROTO_TCP, CTL_CREATE, 1593 CTL_EOL); 1594 1595 /* SACK gets it's own little subtree. */ 1596 sysctl_createv(clog, 0, NULL, &sack_node, 1597 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1598 CTLTYPE_INT, "enable", 1599 SYSCTL_DESCR("Enable RFC2018 Selective ACKnowledgement"), 1600 NULL, 0, &tcp_do_sack, 0, 1601 CTL_NET, pf, IPPROTO_TCP, TCPCTL_SACK, CTL_CREATE, CTL_EOL); 1602 sysctl_createv(clog, 0, NULL, &sack_node, 1603 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1604 CTLTYPE_INT, "maxholes", 1605 SYSCTL_DESCR("Maximum number of TCP SACK holes allowed per connection"), 1606 NULL, 0, &tcp_sack_tp_maxholes, 0, 1607 CTL_NET, pf, IPPROTO_TCP, TCPCTL_SACK, CTL_CREATE, CTL_EOL); 1608 sysctl_createv(clog, 0, NULL, &sack_node, 1609 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1610 CTLTYPE_INT, "globalmaxholes", 1611 SYSCTL_DESCR("Global maximum number of TCP SACK holes"), 1612 NULL, 0, &tcp_sack_globalmaxholes, 0, 1613 CTL_NET, pf, IPPROTO_TCP, TCPCTL_SACK, CTL_CREATE, CTL_EOL); 1614 sysctl_createv(clog, 0, NULL, &sack_node, 1615 CTLFLAG_PERMANENT, 1616 CTLTYPE_INT, "globalholes", 1617 SYSCTL_DESCR("Global number of TCP SACK holes"), 1618 NULL, 0, &tcp_sack_globalholes, 0, 1619 CTL_NET, pf, IPPROTO_TCP, TCPCTL_SACK, CTL_CREATE, CTL_EOL); 1620 1621 sysctl_createv(clog, 0, NULL, NULL, 1622 CTLFLAG_PERMANENT, 1623 CTLTYPE_STRUCT, "stats", 1624 SYSCTL_DESCR("TCP statistics"), 1625 NULL, 0, &tcpstat, sizeof(tcpstat), 1626 CTL_NET, pf, IPPROTO_TCP, TCPCTL_STATS, 1627 CTL_EOL); 1628 #ifdef TCP_DEBUG 1629 sysctl_createv(clog, 0, NULL, NULL, 1630 CTLFLAG_PERMANENT, 1631 CTLTYPE_STRUCT, "debug", 1632 SYSCTL_DESCR("TCP sockets debug information"), 1633 NULL, 0, &tcp_debug, sizeof(tcp_debug), 1634 CTL_NET, pf, IPPROTO_TCP, TCPCTL_DEBUG, 1635 CTL_EOL); 1636 sysctl_createv(clog, 0, NULL, NULL, 1637 CTLFLAG_PERMANENT, 1638 CTLTYPE_INT, "debx", 1639 SYSCTL_DESCR("Number of TCP debug sockets messages"), 1640 NULL, 0, &tcp_debx, sizeof(tcp_debx), 1641 CTL_NET, pf, IPPROTO_TCP, TCPCTL_DEBX, 1642 CTL_EOL); 1643 #endif 1644 1645 } 1646 1647 /* 1648 * Sysctl for tcp variables. 1649 */ 1650 #ifdef INET 1651 SYSCTL_SETUP(sysctl_net_inet_tcp_setup, "sysctl net.inet.tcp subtree setup") 1652 { 1653 1654 sysctl_net_inet_tcp_setup2(clog, PF_INET, "inet", "tcp"); 1655 } 1656 #endif /* INET */ 1657 1658 #ifdef INET6 1659 SYSCTL_SETUP(sysctl_net_inet6_tcp6_setup, "sysctl net.inet6.tcp6 subtree setup") 1660 { 1661 1662 sysctl_net_inet_tcp_setup2(clog, PF_INET6, "inet6", "tcp6"); 1663 } 1664 #endif /* INET6 */ 1665
Indexes created Sun Sep 21 20:09:37 GMT 2025