1 /* 2 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved. 3 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved. 4 * 5 * This code is derived from software contributed to The DragonFly Project 6 * by Jeffrey M. Hsu. 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 DragonFly Project nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific, prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Copyright (c) 1982, 1986, 1988, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Berkeley and its contributors. 50 * 4. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94 67 * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.17 2002/10/11 11:46:44 ume Exp $ 68 * $DragonFly: src/sys/netinet/tcp_usrreq.c,v 1.49 2008/06/17 20:50:11 aggelos Exp $ 69 */ 70 71 #include "opt_ipsec.h" 72 #include "opt_inet6.h" 73 #include "opt_tcpdebug.h" 74 75 #include <sys/param.h> 76 #include <sys/systm.h> 77 #include <sys/kernel.h> 78 #include <sys/malloc.h> 79 #include <sys/sysctl.h> 80 #include <sys/globaldata.h> 81 #include <sys/thread.h> 82 83 #include <sys/mbuf.h> 84 #ifdef INET6 85 #include <sys/domain.h> 86 #endif /* INET6 */ 87 #include <sys/socket.h> 88 #include <sys/socketvar.h> 89 #include <sys/protosw.h> 90 91 #include <sys/thread2.h> 92 #include <sys/msgport2.h> 93 94 #include <net/if.h> 95 #include <net/netisr.h> 96 #include <net/route.h> 97 98 #include <net/netmsg2.h> 99 100 #include <netinet/in.h> 101 #include <netinet/in_systm.h> 102 #ifdef INET6 103 #include <netinet/ip6.h> 104 #endif 105 #include <netinet/in_pcb.h> 106 #ifdef INET6 107 #include <netinet6/in6_pcb.h> 108 #endif 109 #include <netinet/in_var.h> 110 #include <netinet/ip_var.h> 111 #ifdef INET6 112 #include <netinet6/ip6_var.h> 113 #endif 114 #include <netinet/tcp.h> 115 #include <netinet/tcp_fsm.h> 116 #include <netinet/tcp_seq.h> 117 #include <netinet/tcp_timer.h> 118 #include <netinet/tcp_var.h> 119 #include <netinet/tcpip.h> 120 #ifdef TCPDEBUG 121 #include <netinet/tcp_debug.h> 122 #endif 123 124 #ifdef IPSEC 125 #include <netinet6/ipsec.h> 126 #endif /*IPSEC*/ 127 128 /* 129 * TCP protocol interface to socket abstraction. 130 */ 131 extern char *tcpstates[]; /* XXX ??? */ 132 133 static int tcp_attach (struct socket *, struct pru_attach_info *); 134 static int tcp_connect (struct tcpcb *, struct sockaddr *, 135 struct thread *); 136 #ifdef INET6 137 static int tcp6_connect (struct tcpcb *, struct sockaddr *, 138 struct thread *); 139 #endif /* INET6 */ 140 static struct tcpcb * 141 tcp_disconnect (struct tcpcb *); 142 static struct tcpcb * 143 tcp_usrclosed (struct tcpcb *); 144 145 #ifdef TCPDEBUG 146 #define TCPDEBUG0 int ostate = 0 147 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 148 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 149 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 150 #else 151 #define TCPDEBUG0 152 #define TCPDEBUG1() 153 #define TCPDEBUG2(req) 154 #endif 155 156 /* 157 * TCP attaches to socket via pru_attach(), reserving space, 158 * and an internet control block. 159 */ 160 static int 161 tcp_usr_attach(struct socket *so, int proto, struct pru_attach_info *ai) 162 { 163 int error; 164 struct inpcb *inp; 165 struct tcpcb *tp = 0; 166 TCPDEBUG0; 167 168 crit_enter(); 169 inp = so->so_pcb; 170 TCPDEBUG1(); 171 if (inp) { 172 error = EISCONN; 173 goto out; 174 } 175 176 error = tcp_attach(so, ai); 177 if (error) 178 goto out; 179 180 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 181 so->so_linger = TCP_LINGERTIME; 182 tp = sototcpcb(so); 183 out: 184 TCPDEBUG2(PRU_ATTACH); 185 crit_exit(); 186 return error; 187 } 188 189 /* 190 * pru_detach() detaches the TCP protocol from the socket. 191 * If the protocol state is non-embryonic, then can't 192 * do this directly: have to initiate a pru_disconnect(), 193 * which may finish later; embryonic TCB's can just 194 * be discarded here. 195 */ 196 static int 197 tcp_usr_detach(struct socket *so) 198 { 199 int error = 0; 200 struct inpcb *inp; 201 struct tcpcb *tp; 202 TCPDEBUG0; 203 204 crit_enter(); 205 inp = so->so_pcb; 206 if (inp == NULL) { 207 crit_exit(); 208 return EINVAL; /* XXX */ 209 } 210 211 /* 212 * It's possible for the tcpcb (tp) to disconnect from the inp due 213 * to tcp_drop()->tcp_close() being called. This may occur *after* 214 * the detach message has been queued so we may find a NULL tp here. 215 */ 216 if ((tp = intotcpcb(inp)) != NULL) { 217 TCPDEBUG1(); 218 tp = tcp_disconnect(tp); 219 TCPDEBUG2(PRU_DETACH); 220 } 221 crit_exit(); 222 return error; 223 } 224 225 #define COMMON_START(so, inp) \ 226 TCPDEBUG0; \ 227 \ 228 crit_enter(); \ 229 inp = so->so_pcb; \ 230 do { \ 231 if (inp == 0) { \ 232 crit_exit(); \ 233 return EINVAL; \ 234 } \ 235 tp = intotcpcb(inp); \ 236 TCPDEBUG1(); \ 237 } while(0) 238 239 #define COMMON_END(req) out: TCPDEBUG2(req); crit_exit(); return error; goto out 240 241 242 /* 243 * Give the socket an address. 244 */ 245 static int 246 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 247 { 248 int error = 0; 249 struct inpcb *inp; 250 struct tcpcb *tp; 251 struct sockaddr_in *sinp; 252 253 COMMON_START(so, inp); 254 255 /* 256 * Must check for multicast addresses and disallow binding 257 * to them. 258 */ 259 sinp = (struct sockaddr_in *)nam; 260 if (sinp->sin_family == AF_INET && 261 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 262 error = EAFNOSUPPORT; 263 goto out; 264 } 265 error = in_pcbbind(inp, nam, td); 266 if (error) 267 goto out; 268 COMMON_END(PRU_BIND); 269 270 } 271 272 #ifdef INET6 273 static int 274 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 275 { 276 int error = 0; 277 struct inpcb *inp; 278 struct tcpcb *tp; 279 struct sockaddr_in6 *sin6p; 280 281 COMMON_START(so, inp); 282 283 /* 284 * Must check for multicast addresses and disallow binding 285 * to them. 286 */ 287 sin6p = (struct sockaddr_in6 *)nam; 288 if (sin6p->sin6_family == AF_INET6 && 289 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 290 error = EAFNOSUPPORT; 291 goto out; 292 } 293 inp->inp_vflag &= ~INP_IPV4; 294 inp->inp_vflag |= INP_IPV6; 295 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 296 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 297 inp->inp_vflag |= INP_IPV4; 298 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 299 struct sockaddr_in sin; 300 301 in6_sin6_2_sin(&sin, sin6p); 302 inp->inp_vflag |= INP_IPV4; 303 inp->inp_vflag &= ~INP_IPV6; 304 error = in_pcbbind(inp, (struct sockaddr *)&sin, td); 305 goto out; 306 } 307 } 308 error = in6_pcbbind(inp, nam, td); 309 if (error) 310 goto out; 311 COMMON_END(PRU_BIND); 312 } 313 #endif /* INET6 */ 314 315 #ifdef SMP 316 struct netmsg_inswildcard { 317 struct netmsg nm_netmsg; 318 struct inpcb *nm_inp; 319 struct inpcbinfo *nm_pcbinfo; 320 }; 321 322 static void 323 in_pcbinswildcardhash_handler(struct netmsg *msg0) 324 { 325 struct netmsg_inswildcard *msg = (struct netmsg_inswildcard *)msg0; 326 327 in_pcbinswildcardhash_oncpu(msg->nm_inp, msg->nm_pcbinfo); 328 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, 0); 329 } 330 #endif 331 332 /* 333 * Prepare to accept connections. 334 */ 335 static int 336 tcp_usr_listen(struct socket *so, struct thread *td) 337 { 338 int error = 0; 339 struct inpcb *inp; 340 struct tcpcb *tp; 341 #ifdef SMP 342 int cpu; 343 #endif 344 345 COMMON_START(so, inp); 346 if (inp->inp_lport == 0) { 347 error = in_pcbbind(inp, NULL, td); 348 if (error != 0) 349 goto out; 350 } 351 352 tp->t_state = TCPS_LISTEN; 353 #ifdef SMP 354 /* 355 * We have to set the flag because we can't have other cpus 356 * messing with our inp's flags. 357 */ 358 inp->inp_flags |= INP_WILDCARD_MP; 359 for (cpu = 0; cpu < ncpus2; cpu++) { 360 struct netmsg_inswildcard *msg; 361 362 if (cpu == mycpu->gd_cpuid) { 363 in_pcbinswildcardhash(inp); 364 continue; 365 } 366 367 msg = kmalloc(sizeof(struct netmsg_inswildcard), M_LWKTMSG, 368 M_INTWAIT); 369 netmsg_init(&msg->nm_netmsg, &netisr_afree_rport, 0, 370 in_pcbinswildcardhash_handler); 371 msg->nm_inp = inp; 372 msg->nm_pcbinfo = &tcbinfo[cpu]; 373 lwkt_sendmsg(tcp_cport(cpu), &msg->nm_netmsg.nm_lmsg); 374 } 375 #else 376 in_pcbinswildcardhash(inp); 377 #endif 378 COMMON_END(PRU_LISTEN); 379 } 380 381 #ifdef INET6 382 static int 383 tcp6_usr_listen(struct socket *so, struct thread *td) 384 { 385 int error = 0; 386 struct inpcb *inp; 387 struct tcpcb *tp; 388 #ifdef SMP 389 int cpu; 390 #endif 391 392 COMMON_START(so, inp); 393 if (inp->inp_lport == 0) { 394 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) 395 inp->inp_vflag |= INP_IPV4; 396 else 397 inp->inp_vflag &= ~INP_IPV4; 398 error = in6_pcbbind(inp, (struct sockaddr *)0, td); 399 } 400 if (error == 0) 401 tp->t_state = TCPS_LISTEN; 402 #ifdef SMP 403 /* 404 * We have to set the flag because we can't have other cpus 405 * messing with our inp's flags. 406 */ 407 inp->inp_flags |= INP_WILDCARD_MP; 408 for (cpu = 0; cpu < ncpus2; cpu++) { 409 struct netmsg_inswildcard *msg; 410 411 if (cpu == mycpu->gd_cpuid) { 412 in_pcbinswildcardhash(inp); 413 continue; 414 } 415 416 msg = kmalloc(sizeof(struct netmsg_inswildcard), M_LWKTMSG, 417 M_INTWAIT); 418 netmsg_init(&msg->nm_netmsg, &netisr_afree_rport, 0, 419 in_pcbinswildcardhash_handler); 420 msg->nm_inp = inp; 421 msg->nm_pcbinfo = &tcbinfo[cpu]; 422 lwkt_sendmsg(tcp_cport(cpu), &msg->nm_netmsg.nm_lmsg); 423 } 424 #else 425 in_pcbinswildcardhash(inp); 426 #endif 427 COMMON_END(PRU_LISTEN); 428 } 429 #endif /* INET6 */ 430 431 #ifdef SMP 432 static void 433 tcp_output_dispatch(struct netmsg *nmsg) 434 { 435 struct lwkt_msg *msg = &nmsg->nm_lmsg; 436 struct tcpcb *tp = msg->u.ms_resultp; 437 int error; 438 439 error = tcp_output(tp); 440 lwkt_replymsg(msg, error); 441 } 442 #endif 443 444 /* 445 * Initiate connection to peer. 446 * Create a template for use in transmissions on this connection. 447 * Enter SYN_SENT state, and mark socket as connecting. 448 * Start keep-alive timer, and seed output sequence space. 449 * Send initial segment on connection. 450 */ 451 static int 452 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 453 { 454 int error = 0; 455 struct inpcb *inp; 456 struct tcpcb *tp; 457 struct sockaddr_in *sinp; 458 #ifdef SMP 459 lwkt_port_t port; 460 #endif 461 462 COMMON_START(so, inp); 463 464 /* 465 * Must disallow TCP ``connections'' to multicast addresses. 466 */ 467 sinp = (struct sockaddr_in *)nam; 468 if (sinp->sin_family == AF_INET 469 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 470 error = EAFNOSUPPORT; 471 goto out; 472 } 473 474 if (!prison_remote_ip(td, (struct sockaddr*)sinp)) { 475 error = EAFNOSUPPORT; /* IPv6 only jail */ 476 goto out; 477 } 478 479 if ((error = tcp_connect(tp, nam, td)) != 0) 480 goto out; 481 482 #ifdef SMP 483 port = tcp_addrport(inp->inp_faddr.s_addr, inp->inp_fport, 484 inp->inp_laddr.s_addr, inp->inp_lport); 485 if (port != &curthread->td_msgport) { 486 struct netmsg nmsg; 487 struct lwkt_msg *msg; 488 489 netmsg_init(&nmsg, &curthread->td_msgport, 0, 490 tcp_output_dispatch); 491 msg = &nmsg.nm_lmsg; 492 msg->u.ms_resultp = tp; 493 494 error = lwkt_domsg(port, msg, 0); 495 } else 496 #endif 497 error = tcp_output(tp); 498 COMMON_END(PRU_CONNECT); 499 } 500 501 #ifdef INET6 502 static int 503 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 504 { 505 int error = 0; 506 struct inpcb *inp; 507 struct tcpcb *tp; 508 struct sockaddr_in6 *sin6p; 509 510 COMMON_START(so, inp); 511 512 /* 513 * Must disallow TCP ``connections'' to multicast addresses. 514 */ 515 sin6p = (struct sockaddr_in6 *)nam; 516 if (sin6p->sin6_family == AF_INET6 517 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 518 error = EAFNOSUPPORT; 519 goto out; 520 } 521 522 if (!prison_remote_ip(td, nam)) { 523 error = EAFNOSUPPORT; /* IPv4 only jail */ 524 goto out; 525 } 526 527 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 528 struct sockaddr_in sin; 529 530 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 531 error = EINVAL; 532 goto out; 533 } 534 535 in6_sin6_2_sin(&sin, sin6p); 536 inp->inp_vflag |= INP_IPV4; 537 inp->inp_vflag &= ~INP_IPV6; 538 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 539 goto out; 540 error = tcp_output(tp); 541 goto out; 542 } 543 inp->inp_vflag &= ~INP_IPV4; 544 inp->inp_vflag |= INP_IPV6; 545 inp->inp_inc.inc_isipv6 = 1; 546 if ((error = tcp6_connect(tp, nam, td)) != 0) 547 goto out; 548 error = tcp_output(tp); 549 COMMON_END(PRU_CONNECT); 550 } 551 #endif /* INET6 */ 552 553 /* 554 * Initiate disconnect from peer. 555 * If connection never passed embryonic stage, just drop; 556 * else if don't need to let data drain, then can just drop anyways, 557 * else have to begin TCP shutdown process: mark socket disconnecting, 558 * drain unread data, state switch to reflect user close, and 559 * send segment (e.g. FIN) to peer. Socket will be really disconnected 560 * when peer sends FIN and acks ours. 561 * 562 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 563 */ 564 static int 565 tcp_usr_disconnect(struct socket *so) 566 { 567 int error = 0; 568 struct inpcb *inp; 569 struct tcpcb *tp; 570 571 COMMON_START(so, inp); 572 tp = tcp_disconnect(tp); 573 COMMON_END(PRU_DISCONNECT); 574 } 575 576 /* 577 * Accept a connection. Essentially all the work is 578 * done at higher levels; just return the address 579 * of the peer, storing through addr. 580 */ 581 static int 582 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 583 { 584 int error = 0; 585 struct inpcb *inp; 586 struct tcpcb *tp = NULL; 587 TCPDEBUG0; 588 589 crit_enter(); 590 inp = so->so_pcb; 591 if (so->so_state & SS_ISDISCONNECTED) { 592 error = ECONNABORTED; 593 goto out; 594 } 595 if (inp == 0) { 596 crit_exit(); 597 return (EINVAL); 598 } 599 tp = intotcpcb(inp); 600 TCPDEBUG1(); 601 in_setpeeraddr(so, nam); 602 COMMON_END(PRU_ACCEPT); 603 } 604 605 #ifdef INET6 606 static int 607 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 608 { 609 int error = 0; 610 struct inpcb *inp; 611 struct tcpcb *tp = NULL; 612 TCPDEBUG0; 613 614 crit_enter(); 615 inp = so->so_pcb; 616 617 if (so->so_state & SS_ISDISCONNECTED) { 618 error = ECONNABORTED; 619 goto out; 620 } 621 if (inp == 0) { 622 crit_exit(); 623 return (EINVAL); 624 } 625 tp = intotcpcb(inp); 626 TCPDEBUG1(); 627 in6_mapped_peeraddr(so, nam); 628 COMMON_END(PRU_ACCEPT); 629 } 630 #endif /* INET6 */ 631 /* 632 * Mark the connection as being incapable of further output. 633 */ 634 static int 635 tcp_usr_shutdown(struct socket *so) 636 { 637 int error = 0; 638 struct inpcb *inp; 639 struct tcpcb *tp; 640 641 COMMON_START(so, inp); 642 socantsendmore(so); 643 tp = tcp_usrclosed(tp); 644 if (tp) 645 error = tcp_output(tp); 646 COMMON_END(PRU_SHUTDOWN); 647 } 648 649 /* 650 * After a receive, possibly send window update to peer. 651 */ 652 static int 653 tcp_usr_rcvd(struct socket *so, int flags) 654 { 655 int error = 0; 656 struct inpcb *inp; 657 struct tcpcb *tp; 658 659 COMMON_START(so, inp); 660 tcp_output(tp); 661 COMMON_END(PRU_RCVD); 662 } 663 664 /* 665 * Do a send by putting data in output queue and updating urgent 666 * marker if URG set. Possibly send more data. Unlike the other 667 * pru_*() routines, the mbuf chains are our responsibility. We 668 * must either enqueue them or free them. The other pru_* routines 669 * generally are caller-frees. 670 */ 671 static int 672 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 673 struct sockaddr *nam, struct mbuf *control, struct thread *td) 674 { 675 int error = 0; 676 struct inpcb *inp; 677 struct tcpcb *tp; 678 #ifdef INET6 679 int isipv6; 680 #endif 681 TCPDEBUG0; 682 683 crit_enter(); 684 inp = so->so_pcb; 685 686 if (inp == NULL) { 687 /* 688 * OOPS! we lost a race, the TCP session got reset after 689 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a 690 * network interrupt in the non-critical section of sosend(). 691 */ 692 if (m) 693 m_freem(m); 694 if (control) 695 m_freem(control); 696 error = ECONNRESET; /* XXX EPIPE? */ 697 tp = NULL; 698 TCPDEBUG1(); 699 goto out; 700 } 701 #ifdef INET6 702 isipv6 = nam && nam->sa_family == AF_INET6; 703 #endif /* INET6 */ 704 tp = intotcpcb(inp); 705 TCPDEBUG1(); 706 if (control) { 707 /* TCP doesn't do control messages (rights, creds, etc) */ 708 if (control->m_len) { 709 m_freem(control); 710 if (m) 711 m_freem(m); 712 error = EINVAL; 713 goto out; 714 } 715 m_freem(control); /* empty control, just free it */ 716 } 717 if(!(flags & PRUS_OOB)) { 718 ssb_appendstream(&so->so_snd, m); 719 if (nam && tp->t_state < TCPS_SYN_SENT) { 720 /* 721 * Do implied connect if not yet connected, 722 * initialize window to default value, and 723 * initialize maxseg/maxopd using peer's cached 724 * MSS. 725 */ 726 #ifdef INET6 727 if (isipv6) 728 error = tcp6_connect(tp, nam, td); 729 else 730 #endif /* INET6 */ 731 error = tcp_connect(tp, nam, td); 732 if (error) 733 goto out; 734 tp->snd_wnd = TTCP_CLIENT_SND_WND; 735 tcp_mss(tp, -1); 736 } 737 738 if (flags & PRUS_EOF) { 739 /* 740 * Close the send side of the connection after 741 * the data is sent. 742 */ 743 socantsendmore(so); 744 tp = tcp_usrclosed(tp); 745 } 746 if (tp != NULL) { 747 if (flags & PRUS_MORETOCOME) 748 tp->t_flags |= TF_MORETOCOME; 749 error = tcp_output(tp); 750 if (flags & PRUS_MORETOCOME) 751 tp->t_flags &= ~TF_MORETOCOME; 752 } 753 } else { 754 if (ssb_space(&so->so_snd) < -512) { 755 m_freem(m); 756 error = ENOBUFS; 757 goto out; 758 } 759 /* 760 * According to RFC961 (Assigned Protocols), 761 * the urgent pointer points to the last octet 762 * of urgent data. We continue, however, 763 * to consider it to indicate the first octet 764 * of data past the urgent section. 765 * Otherwise, snd_up should be one lower. 766 */ 767 ssb_appendstream(&so->so_snd, m); 768 if (nam && tp->t_state < TCPS_SYN_SENT) { 769 /* 770 * Do implied connect if not yet connected, 771 * initialize window to default value, and 772 * initialize maxseg/maxopd using peer's cached 773 * MSS. 774 */ 775 #ifdef INET6 776 if (isipv6) 777 error = tcp6_connect(tp, nam, td); 778 else 779 #endif /* INET6 */ 780 error = tcp_connect(tp, nam, td); 781 if (error) 782 goto out; 783 tp->snd_wnd = TTCP_CLIENT_SND_WND; 784 tcp_mss(tp, -1); 785 } 786 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 787 tp->t_flags |= TF_FORCE; 788 error = tcp_output(tp); 789 tp->t_flags &= ~TF_FORCE; 790 } 791 COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB : 792 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 793 } 794 795 /* 796 * Abort the TCP. 797 */ 798 static int 799 tcp_usr_abort(struct socket *so) 800 { 801 int error = 0; 802 struct inpcb *inp; 803 struct tcpcb *tp; 804 805 COMMON_START(so, inp); 806 tp = tcp_drop(tp, ECONNABORTED); 807 COMMON_END(PRU_ABORT); 808 } 809 810 /* 811 * Receive out-of-band data. 812 */ 813 static int 814 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 815 { 816 int error = 0; 817 struct inpcb *inp; 818 struct tcpcb *tp; 819 820 COMMON_START(so, inp); 821 if ((so->so_oobmark == 0 && 822 (so->so_state & SS_RCVATMARK) == 0) || 823 so->so_options & SO_OOBINLINE || 824 tp->t_oobflags & TCPOOB_HADDATA) { 825 error = EINVAL; 826 goto out; 827 } 828 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 829 error = EWOULDBLOCK; 830 goto out; 831 } 832 m->m_len = 1; 833 *mtod(m, caddr_t) = tp->t_iobc; 834 if ((flags & MSG_PEEK) == 0) 835 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 836 COMMON_END(PRU_RCVOOB); 837 } 838 839 /* xxx - should be const */ 840 struct pr_usrreqs tcp_usrreqs = { 841 .pru_abort = tcp_usr_abort, 842 .pru_accept = tcp_usr_accept, 843 .pru_attach = tcp_usr_attach, 844 .pru_bind = tcp_usr_bind, 845 .pru_connect = tcp_usr_connect, 846 .pru_connect2 = pru_connect2_notsupp, 847 .pru_control = in_control, 848 .pru_detach = tcp_usr_detach, 849 .pru_disconnect = tcp_usr_disconnect, 850 .pru_listen = tcp_usr_listen, 851 .pru_peeraddr = in_setpeeraddr, 852 .pru_rcvd = tcp_usr_rcvd, 853 .pru_rcvoob = tcp_usr_rcvoob, 854 .pru_send = tcp_usr_send, 855 .pru_sense = pru_sense_null, 856 .pru_shutdown = tcp_usr_shutdown, 857 .pru_sockaddr = in_setsockaddr, 858 .pru_sosend = sosend, 859 .pru_soreceive = soreceive, 860 .pru_sopoll = sopoll 861 }; 862 863 #ifdef INET6 864 struct pr_usrreqs tcp6_usrreqs = { 865 .pru_abort = tcp_usr_abort, 866 .pru_accept = tcp6_usr_accept, 867 .pru_attach = tcp_usr_attach, 868 .pru_bind = tcp6_usr_bind, 869 .pru_connect = tcp6_usr_connect, 870 .pru_connect2 = pru_connect2_notsupp, 871 .pru_control = in6_control, 872 .pru_detach = tcp_usr_detach, 873 .pru_disconnect = tcp_usr_disconnect, 874 .pru_listen = tcp6_usr_listen, 875 .pru_peeraddr = in6_mapped_peeraddr, 876 .pru_rcvd = tcp_usr_rcvd, 877 .pru_rcvoob = tcp_usr_rcvoob, 878 .pru_send = tcp_usr_send, 879 .pru_sense = pru_sense_null, 880 .pru_shutdown = tcp_usr_shutdown, 881 .pru_sockaddr = in6_mapped_sockaddr, 882 .pru_sosend = sosend, 883 .pru_soreceive = soreceive, 884 .pru_sopoll = sopoll 885 }; 886 #endif /* INET6 */ 887 888 static int 889 tcp_connect_oncpu(struct tcpcb *tp, struct sockaddr_in *sin, 890 struct sockaddr_in *if_sin) 891 { 892 struct inpcb *inp = tp->t_inpcb, *oinp; 893 struct socket *so = inp->inp_socket; 894 struct tcpcb *otp; 895 struct rmxp_tao *taop; 896 struct rmxp_tao tao_noncached; 897 898 oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid], 899 sin->sin_addr, sin->sin_port, 900 inp->inp_laddr.s_addr != INADDR_ANY ? 901 inp->inp_laddr : if_sin->sin_addr, 902 inp->inp_lport, 0, NULL); 903 if (oinp != NULL) { 904 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL && 905 otp->t_state == TCPS_TIME_WAIT && 906 (ticks - otp->t_starttime) < tcp_msl && 907 (otp->t_flags & TF_RCVD_CC)) 908 tcp_close(otp); 909 else 910 return (EADDRINUSE); 911 } 912 if (inp->inp_laddr.s_addr == INADDR_ANY) 913 inp->inp_laddr = if_sin->sin_addr; 914 inp->inp_faddr = sin->sin_addr; 915 inp->inp_fport = sin->sin_port; 916 inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid]; 917 in_pcbinsconnhash(inp); 918 919 /* Compute window scaling to request. */ 920 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 921 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) 922 tp->request_r_scale++; 923 924 soisconnecting(so); 925 tcpstat.tcps_connattempt++; 926 tp->t_state = TCPS_SYN_SENT; 927 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp); 928 tp->iss = tcp_new_isn(tp); 929 tcp_sendseqinit(tp); 930 931 /* 932 * Generate a CC value for this connection and 933 * check whether CC or CCnew should be used. 934 */ 935 if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) { 936 taop = &tao_noncached; 937 bzero(taop, sizeof *taop); 938 } 939 940 tp->cc_send = CC_INC(tcp_ccgen); 941 if (taop->tao_ccsent != 0 && 942 CC_GEQ(tp->cc_send, taop->tao_ccsent)) { 943 taop->tao_ccsent = tp->cc_send; 944 } else { 945 taop->tao_ccsent = 0; 946 tp->t_flags |= TF_SENDCCNEW; 947 } 948 949 return (0); 950 } 951 952 #ifdef SMP 953 954 struct netmsg_tcp_connect { 955 struct netmsg nm_netmsg; 956 struct tcpcb *nm_tp; 957 struct sockaddr_in *nm_sin; 958 struct sockaddr_in *nm_ifsin; 959 }; 960 961 static void 962 tcp_connect_handler(netmsg_t netmsg) 963 { 964 struct netmsg_tcp_connect *msg = (void *)netmsg; 965 int error; 966 967 error = tcp_connect_oncpu(msg->nm_tp, msg->nm_sin, msg->nm_ifsin); 968 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, error); 969 } 970 971 #endif 972 973 /* 974 * Common subroutine to open a TCP connection to remote host specified 975 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 976 * port number if needed. Call in_pcbladdr to do the routing and to choose 977 * a local host address (interface). If there is an existing incarnation 978 * of the same connection in TIME-WAIT state and if the remote host was 979 * sending CC options and if the connection duration was < MSL, then 980 * truncate the previous TIME-WAIT state and proceed. 981 * Initialize connection parameters and enter SYN-SENT state. 982 */ 983 static int 984 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 985 { 986 struct inpcb *inp = tp->t_inpcb; 987 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 988 struct sockaddr_in *if_sin; 989 int error; 990 #ifdef SMP 991 lwkt_port_t port; 992 #endif 993 994 if (inp->inp_lport == 0) { 995 error = in_pcbbind(inp, (struct sockaddr *)NULL, td); 996 if (error) 997 return (error); 998 } 999 1000 /* 1001 * Cannot simply call in_pcbconnect, because there might be an 1002 * earlier incarnation of this same connection still in 1003 * TIME_WAIT state, creating an ADDRINUSE error. 1004 */ 1005 error = in_pcbladdr(inp, nam, &if_sin, td); 1006 if (error) 1007 return (error); 1008 1009 #ifdef SMP 1010 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port, 1011 inp->inp_laddr.s_addr ? 1012 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr, 1013 inp->inp_lport); 1014 1015 if (port != &curthread->td_msgport) { 1016 struct netmsg_tcp_connect msg; 1017 struct route *ro = &inp->inp_route; 1018 1019 /* 1020 * in_pcbladdr() may have allocated a route entry for us 1021 * on the current CPU, but we need a route entry on the 1022 * target CPU, so free it here. 1023 */ 1024 if (ro->ro_rt != NULL) 1025 RTFREE(ro->ro_rt); 1026 bzero(ro, sizeof(*ro)); 1027 1028 netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0, 1029 tcp_connect_handler); 1030 msg.nm_tp = tp; 1031 msg.nm_sin = sin; 1032 msg.nm_ifsin = if_sin; 1033 error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0); 1034 } else 1035 #endif 1036 error = tcp_connect_oncpu(tp, sin, if_sin); 1037 1038 return (error); 1039 } 1040 1041 #ifdef INET6 1042 static int 1043 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1044 { 1045 struct inpcb *inp = tp->t_inpcb, *oinp; 1046 struct socket *so = inp->inp_socket; 1047 struct tcpcb *otp; 1048 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 1049 struct in6_addr *addr6; 1050 struct rmxp_tao *taop; 1051 struct rmxp_tao tao_noncached; 1052 int error; 1053 1054 if (inp->inp_lport == 0) { 1055 error = in6_pcbbind(inp, (struct sockaddr *)0, td); 1056 if (error) 1057 return error; 1058 } 1059 1060 /* 1061 * Cannot simply call in_pcbconnect, because there might be an 1062 * earlier incarnation of this same connection still in 1063 * TIME_WAIT state, creating an ADDRINUSE error. 1064 */ 1065 error = in6_pcbladdr(inp, nam, &addr6, td); 1066 if (error) 1067 return error; 1068 oinp = in6_pcblookup_hash(inp->inp_cpcbinfo, 1069 &sin6->sin6_addr, sin6->sin6_port, 1070 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ? 1071 addr6 : &inp->in6p_laddr, 1072 inp->inp_lport, 0, NULL); 1073 if (oinp) { 1074 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL && 1075 otp->t_state == TCPS_TIME_WAIT && 1076 (ticks - otp->t_starttime) < tcp_msl && 1077 (otp->t_flags & TF_RCVD_CC)) 1078 otp = tcp_close(otp); 1079 else 1080 return (EADDRINUSE); 1081 } 1082 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1083 inp->in6p_laddr = *addr6; 1084 inp->in6p_faddr = sin6->sin6_addr; 1085 inp->inp_fport = sin6->sin6_port; 1086 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0) 1087 inp->in6p_flowinfo = sin6->sin6_flowinfo; 1088 in_pcbinsconnhash(inp); 1089 1090 /* Compute window scaling to request. */ 1091 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1092 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) 1093 tp->request_r_scale++; 1094 1095 soisconnecting(so); 1096 tcpstat.tcps_connattempt++; 1097 tp->t_state = TCPS_SYN_SENT; 1098 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp); 1099 tp->iss = tcp_new_isn(tp); 1100 tcp_sendseqinit(tp); 1101 1102 /* 1103 * Generate a CC value for this connection and 1104 * check whether CC or CCnew should be used. 1105 */ 1106 if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) { 1107 taop = &tao_noncached; 1108 bzero(taop, sizeof *taop); 1109 } 1110 1111 tp->cc_send = CC_INC(tcp_ccgen); 1112 if (taop->tao_ccsent != 0 && 1113 CC_GEQ(tp->cc_send, taop->tao_ccsent)) { 1114 taop->tao_ccsent = tp->cc_send; 1115 } else { 1116 taop->tao_ccsent = 0; 1117 tp->t_flags |= TF_SENDCCNEW; 1118 } 1119 1120 return (0); 1121 } 1122 #endif /* INET6 */ 1123 1124 /* 1125 * The new sockopt interface makes it possible for us to block in the 1126 * copyin/out step (if we take a page fault). Taking a page fault while 1127 * in a critical section is probably a Bad Thing. (Since sockets and pcbs 1128 * both now use TSM, there probably isn't any need for this function to 1129 * run in a critical section any more. This needs more examination.) 1130 */ 1131 int 1132 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1133 { 1134 int error, opt, optval; 1135 struct inpcb *inp; 1136 struct tcpcb *tp; 1137 1138 error = 0; 1139 crit_enter(); /* XXX */ 1140 inp = so->so_pcb; 1141 if (inp == NULL) { 1142 crit_exit(); 1143 return (ECONNRESET); 1144 } 1145 if (sopt->sopt_level != IPPROTO_TCP) { 1146 #ifdef INET6 1147 if (INP_CHECK_SOCKAF(so, AF_INET6)) 1148 error = ip6_ctloutput(so, sopt); 1149 else 1150 #endif /* INET6 */ 1151 error = ip_ctloutput(so, sopt); 1152 crit_exit(); 1153 return (error); 1154 } 1155 tp = intotcpcb(inp); 1156 1157 switch (sopt->sopt_dir) { 1158 case SOPT_SET: 1159 error = soopt_to_kbuf(sopt, &optval, sizeof optval, 1160 sizeof optval); 1161 if (error) 1162 break; 1163 switch (sopt->sopt_name) { 1164 case TCP_NODELAY: 1165 case TCP_NOOPT: 1166 switch (sopt->sopt_name) { 1167 case TCP_NODELAY: 1168 opt = TF_NODELAY; 1169 break; 1170 case TCP_NOOPT: 1171 opt = TF_NOOPT; 1172 break; 1173 default: 1174 opt = 0; /* dead code to fool gcc */ 1175 break; 1176 } 1177 1178 if (optval) 1179 tp->t_flags |= opt; 1180 else 1181 tp->t_flags &= ~opt; 1182 break; 1183 1184 case TCP_NOPUSH: 1185 if (optval) 1186 tp->t_flags |= TF_NOPUSH; 1187 else { 1188 tp->t_flags &= ~TF_NOPUSH; 1189 error = tcp_output(tp); 1190 } 1191 break; 1192 1193 case TCP_MAXSEG: 1194 if (optval > 0 && optval <= tp->t_maxseg) 1195 tp->t_maxseg = optval; 1196 else 1197 error = EINVAL; 1198 break; 1199 1200 default: 1201 error = ENOPROTOOPT; 1202 break; 1203 } 1204 break; 1205 1206 case SOPT_GET: 1207 switch (sopt->sopt_name) { 1208 case TCP_NODELAY: 1209 optval = tp->t_flags & TF_NODELAY; 1210 break; 1211 case TCP_MAXSEG: 1212 optval = tp->t_maxseg; 1213 break; 1214 case TCP_NOOPT: 1215 optval = tp->t_flags & TF_NOOPT; 1216 break; 1217 case TCP_NOPUSH: 1218 optval = tp->t_flags & TF_NOPUSH; 1219 break; 1220 default: 1221 error = ENOPROTOOPT; 1222 break; 1223 } 1224 if (error == 0) 1225 soopt_from_kbuf(sopt, &optval, sizeof optval); 1226 break; 1227 } 1228 crit_exit(); 1229 return (error); 1230 } 1231 1232 /* 1233 * tcp_sendspace and tcp_recvspace are the default send and receive window 1234 * sizes, respectively. These are obsolescent (this information should 1235 * be set by the route). 1236 */ 1237 u_long tcp_sendspace = 1024*32; 1238 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, 1239 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); 1240 u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ 1241 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 1242 &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); 1243 1244 /* 1245 * Attach TCP protocol to socket, allocating 1246 * internet protocol control block, tcp control block, 1247 * bufer space, and entering LISTEN state if to accept connections. 1248 */ 1249 static int 1250 tcp_attach(struct socket *so, struct pru_attach_info *ai) 1251 { 1252 struct tcpcb *tp; 1253 struct inpcb *inp; 1254 int error; 1255 int cpu; 1256 #ifdef INET6 1257 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0; 1258 #endif 1259 1260 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) { 1261 error = soreserve(so, tcp_sendspace, tcp_recvspace, 1262 ai->sb_rlimit); 1263 if (error) 1264 return (error); 1265 } 1266 cpu = mycpu->gd_cpuid; 1267 error = in_pcballoc(so, &tcbinfo[cpu]); 1268 if (error) 1269 return (error); 1270 inp = so->so_pcb; 1271 #ifdef INET6 1272 if (isipv6) { 1273 inp->inp_vflag |= INP_IPV6; 1274 inp->in6p_hops = -1; /* use kernel default */ 1275 } 1276 else 1277 #endif 1278 inp->inp_vflag |= INP_IPV4; 1279 tp = tcp_newtcpcb(inp); 1280 if (tp == 0) { 1281 int nofd = so->so_state & SS_NOFDREF; /* XXX */ 1282 1283 so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */ 1284 #ifdef INET6 1285 if (isipv6) 1286 in6_pcbdetach(inp); 1287 else 1288 #endif 1289 in_pcbdetach(inp); 1290 so->so_state |= nofd; 1291 return (ENOBUFS); 1292 } 1293 tp->t_state = TCPS_CLOSED; 1294 return (0); 1295 } 1296 1297 /* 1298 * Initiate (or continue) disconnect. 1299 * If embryonic state, just send reset (once). 1300 * If in ``let data drain'' option and linger null, just drop. 1301 * Otherwise (hard), mark socket disconnecting and drop 1302 * current input data; switch states based on user close, and 1303 * send segment to peer (with FIN). 1304 */ 1305 static struct tcpcb * 1306 tcp_disconnect(struct tcpcb *tp) 1307 { 1308 struct socket *so = tp->t_inpcb->inp_socket; 1309 1310 if (tp->t_state < TCPS_ESTABLISHED) 1311 tp = tcp_close(tp); 1312 else if ((so->so_options & SO_LINGER) && so->so_linger == 0) 1313 tp = tcp_drop(tp, 0); 1314 else { 1315 soisdisconnecting(so); 1316 sbflush(&so->so_rcv.sb); 1317 tp = tcp_usrclosed(tp); 1318 if (tp) 1319 tcp_output(tp); 1320 } 1321 return (tp); 1322 } 1323 1324 /* 1325 * User issued close, and wish to trail through shutdown states: 1326 * if never received SYN, just forget it. If got a SYN from peer, 1327 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1328 * If already got a FIN from peer, then almost done; go to LAST_ACK 1329 * state. In all other cases, have already sent FIN to peer (e.g. 1330 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1331 * for peer to send FIN or not respond to keep-alives, etc. 1332 * We can let the user exit from the close as soon as the FIN is acked. 1333 */ 1334 static struct tcpcb * 1335 tcp_usrclosed(struct tcpcb *tp) 1336 { 1337 1338 switch (tp->t_state) { 1339 1340 case TCPS_CLOSED: 1341 case TCPS_LISTEN: 1342 tp->t_state = TCPS_CLOSED; 1343 tp = tcp_close(tp); 1344 break; 1345 1346 case TCPS_SYN_SENT: 1347 case TCPS_SYN_RECEIVED: 1348 tp->t_flags |= TF_NEEDFIN; 1349 break; 1350 1351 case TCPS_ESTABLISHED: 1352 tp->t_state = TCPS_FIN_WAIT_1; 1353 break; 1354 1355 case TCPS_CLOSE_WAIT: 1356 tp->t_state = TCPS_LAST_ACK; 1357 break; 1358 } 1359 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) { 1360 soisdisconnected(tp->t_inpcb->inp_socket); 1361 /* To prevent the connection hanging in FIN_WAIT_2 forever. */ 1362 if (tp->t_state == TCPS_FIN_WAIT_2) 1363 callout_reset(tp->tt_2msl, tcp_maxidle, 1364 tcp_timer_2msl, tp); 1365 } 1366 return (tp); 1367 } 1368