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 1.51 2008/09/29 20:52:23 dillon 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 #include <netinet6/tcp6_var.h> 114 #endif 115 #include <netinet/tcp.h> 116 #include <netinet/tcp_fsm.h> 117 #include <netinet/tcp_seq.h> 118 #include <netinet/tcp_timer.h> 119 #include <netinet/tcp_timer2.h> 120 #include <netinet/tcp_var.h> 121 #include <netinet/tcpip.h> 122 #ifdef TCPDEBUG 123 #include <netinet/tcp_debug.h> 124 #endif 125 126 #ifdef IPSEC 127 #include <netinet6/ipsec.h> 128 #endif /*IPSEC*/ 129 130 /* 131 * TCP protocol interface to socket abstraction. 132 */ 133 extern char *tcpstates[]; /* XXX ??? */ 134 135 static int tcp_attach (struct socket *, struct pru_attach_info *); 136 static int tcp_connect (struct tcpcb *, struct sockaddr *, 137 struct thread *); 138 #ifdef INET6 139 static int tcp6_connect (struct tcpcb *, struct sockaddr *, 140 struct thread *); 141 static int tcp6_connect_oncpu(struct tcpcb *tp, struct sockaddr_in6 *sin6, 142 struct in6_addr *addr6); 143 #endif /* INET6 */ 144 static struct tcpcb * 145 tcp_disconnect (struct tcpcb *); 146 static struct tcpcb * 147 tcp_usrclosed (struct tcpcb *); 148 149 #ifdef TCPDEBUG 150 #define TCPDEBUG0 int ostate = 0 151 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 152 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 153 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 154 #else 155 #define TCPDEBUG0 156 #define TCPDEBUG1() 157 #define TCPDEBUG2(req) 158 #endif 159 160 /* 161 * TCP attaches to socket via pru_attach(), reserving space, 162 * and an internet control block. 163 */ 164 static int 165 tcp_usr_attach(struct socket *so, int proto, struct pru_attach_info *ai) 166 { 167 int error; 168 struct inpcb *inp; 169 struct tcpcb *tp = 0; 170 TCPDEBUG0; 171 172 crit_enter(); 173 inp = so->so_pcb; 174 TCPDEBUG1(); 175 if (inp) { 176 error = EISCONN; 177 goto out; 178 } 179 180 error = tcp_attach(so, ai); 181 if (error) 182 goto out; 183 184 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 185 so->so_linger = TCP_LINGERTIME; 186 tp = sototcpcb(so); 187 out: 188 TCPDEBUG2(PRU_ATTACH); 189 crit_exit(); 190 return error; 191 } 192 193 /* 194 * pru_detach() detaches the TCP protocol from the socket. 195 * If the protocol state is non-embryonic, then can't 196 * do this directly: have to initiate a pru_disconnect(), 197 * which may finish later; embryonic TCB's can just 198 * be discarded here. 199 */ 200 static int 201 tcp_usr_detach(struct socket *so) 202 { 203 int error = 0; 204 struct inpcb *inp; 205 struct tcpcb *tp; 206 TCPDEBUG0; 207 208 crit_enter(); 209 inp = so->so_pcb; 210 211 /* 212 * If the inp is already detached it may have been due to an async 213 * close. Just return as if no error occured. 214 */ 215 if (inp == NULL) { 216 crit_exit(); 217 return 0; 218 } 219 220 /* 221 * It's possible for the tcpcb (tp) to disconnect from the inp due 222 * to tcp_drop()->tcp_close() being called. This may occur *after* 223 * the detach message has been queued so we may find a NULL tp here. 224 */ 225 if ((tp = intotcpcb(inp)) != NULL) { 226 TCPDEBUG1(); 227 tp = tcp_disconnect(tp); 228 TCPDEBUG2(PRU_DETACH); 229 } 230 crit_exit(); 231 return error; 232 } 233 234 /* 235 * Note: ignore_error is non-zero for certain disconnection races 236 * which we want to silently allow, otherwise close() may return 237 * an unexpected error. 238 */ 239 #define COMMON_START(so, inp, ignore_error) \ 240 TCPDEBUG0; \ 241 \ 242 crit_enter(); \ 243 inp = so->so_pcb; \ 244 do { \ 245 if (inp == NULL) { \ 246 crit_exit(); \ 247 return (ignore_error ? 0 : EINVAL); \ 248 } \ 249 tp = intotcpcb(inp); \ 250 TCPDEBUG1(); \ 251 } while(0) 252 253 #define COMMON_END(req) out: TCPDEBUG2(req); crit_exit(); return error; goto out 254 255 256 /* 257 * Give the socket an address. 258 */ 259 static int 260 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 261 { 262 int error = 0; 263 struct inpcb *inp; 264 struct tcpcb *tp; 265 struct sockaddr_in *sinp; 266 267 COMMON_START(so, inp, 0); 268 269 /* 270 * Must check for multicast addresses and disallow binding 271 * to them. 272 */ 273 sinp = (struct sockaddr_in *)nam; 274 if (sinp->sin_family == AF_INET && 275 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 276 error = EAFNOSUPPORT; 277 goto out; 278 } 279 error = in_pcbbind(inp, nam, td); 280 if (error) 281 goto out; 282 COMMON_END(PRU_BIND); 283 284 } 285 286 #ifdef INET6 287 static int 288 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 289 { 290 int error = 0; 291 struct inpcb *inp; 292 struct tcpcb *tp; 293 struct sockaddr_in6 *sin6p; 294 295 COMMON_START(so, inp, 0); 296 297 /* 298 * Must check for multicast addresses and disallow binding 299 * to them. 300 */ 301 sin6p = (struct sockaddr_in6 *)nam; 302 if (sin6p->sin6_family == AF_INET6 && 303 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 304 error = EAFNOSUPPORT; 305 goto out; 306 } 307 inp->inp_vflag &= ~INP_IPV4; 308 inp->inp_vflag |= INP_IPV6; 309 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 310 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 311 inp->inp_vflag |= INP_IPV4; 312 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 313 struct sockaddr_in sin; 314 315 in6_sin6_2_sin(&sin, sin6p); 316 inp->inp_vflag |= INP_IPV4; 317 inp->inp_vflag &= ~INP_IPV6; 318 error = in_pcbbind(inp, (struct sockaddr *)&sin, td); 319 goto out; 320 } 321 } 322 error = in6_pcbbind(inp, nam, td); 323 if (error) 324 goto out; 325 COMMON_END(PRU_BIND); 326 } 327 #endif /* INET6 */ 328 329 #ifdef SMP 330 struct netmsg_inswildcard { 331 struct netmsg nm_netmsg; 332 struct inpcb *nm_inp; 333 struct inpcbinfo *nm_pcbinfo; 334 }; 335 336 static void 337 in_pcbinswildcardhash_handler(struct netmsg *msg0) 338 { 339 struct netmsg_inswildcard *msg = (struct netmsg_inswildcard *)msg0; 340 341 in_pcbinswildcardhash_oncpu(msg->nm_inp, msg->nm_pcbinfo); 342 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, 0); 343 } 344 #endif 345 346 /* 347 * Prepare to accept connections. 348 */ 349 static int 350 tcp_usr_listen(struct socket *so, struct thread *td) 351 { 352 int error = 0; 353 struct inpcb *inp; 354 struct tcpcb *tp; 355 #ifdef SMP 356 int cpu; 357 #endif 358 359 COMMON_START(so, inp, 0); 360 if (inp->inp_lport == 0) { 361 error = in_pcbbind(inp, NULL, td); 362 if (error != 0) 363 goto out; 364 } 365 366 tp->t_state = TCPS_LISTEN; 367 tp->tt_msg = NULL; /* Catch any invalid timer usage */ 368 #ifdef SMP 369 /* 370 * We have to set the flag because we can't have other cpus 371 * messing with our inp's flags. 372 */ 373 inp->inp_flags |= INP_WILDCARD_MP; 374 for (cpu = 0; cpu < ncpus2; cpu++) { 375 struct netmsg_inswildcard *msg; 376 377 if (cpu == mycpu->gd_cpuid) { 378 in_pcbinswildcardhash(inp); 379 continue; 380 } 381 382 msg = kmalloc(sizeof(struct netmsg_inswildcard), M_LWKTMSG, 383 M_INTWAIT); 384 netmsg_init(&msg->nm_netmsg, &netisr_afree_rport, 0, 385 in_pcbinswildcardhash_handler); 386 msg->nm_inp = inp; 387 msg->nm_pcbinfo = &tcbinfo[cpu]; 388 lwkt_sendmsg(tcp_cport(cpu), &msg->nm_netmsg.nm_lmsg); 389 } 390 #else 391 in_pcbinswildcardhash(inp); 392 #endif 393 COMMON_END(PRU_LISTEN); 394 } 395 396 #ifdef INET6 397 static int 398 tcp6_usr_listen(struct socket *so, struct thread *td) 399 { 400 int error = 0; 401 struct inpcb *inp; 402 struct tcpcb *tp; 403 #ifdef SMP 404 int cpu; 405 #endif 406 407 COMMON_START(so, inp, 0); 408 if (inp->inp_lport == 0) { 409 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) 410 inp->inp_vflag |= INP_IPV4; 411 else 412 inp->inp_vflag &= ~INP_IPV4; 413 error = in6_pcbbind(inp, NULL, td); 414 } 415 if (error == 0) 416 tp->t_state = TCPS_LISTEN; 417 #ifdef SMP 418 /* 419 * We have to set the flag because we can't have other cpus 420 * messing with our inp's flags. 421 */ 422 inp->inp_flags |= INP_WILDCARD_MP; 423 for (cpu = 0; cpu < ncpus2; cpu++) { 424 struct netmsg_inswildcard *msg; 425 426 if (cpu == mycpu->gd_cpuid) { 427 in_pcbinswildcardhash(inp); 428 continue; 429 } 430 431 msg = kmalloc(sizeof(struct netmsg_inswildcard), M_LWKTMSG, 432 M_INTWAIT); 433 netmsg_init(&msg->nm_netmsg, &netisr_afree_rport, 0, 434 in_pcbinswildcardhash_handler); 435 msg->nm_inp = inp; 436 msg->nm_pcbinfo = &tcbinfo[cpu]; 437 lwkt_sendmsg(tcp_cport(cpu), &msg->nm_netmsg.nm_lmsg); 438 } 439 #else 440 in_pcbinswildcardhash(inp); 441 #endif 442 COMMON_END(PRU_LISTEN); 443 } 444 #endif /* INET6 */ 445 446 #ifdef SMP 447 static void 448 tcp_output_dispatch(struct netmsg *nmsg) 449 { 450 struct lwkt_msg *msg = &nmsg->nm_lmsg; 451 struct tcpcb *tp = msg->u.ms_resultp; 452 int error; 453 454 error = tcp_output(tp); 455 lwkt_replymsg(msg, error); 456 } 457 #endif 458 459 static int 460 tcp_conn_output(struct tcpcb *tp) 461 { 462 int error; 463 #ifdef SMP 464 struct inpcb *inp = tp->t_inpcb; 465 lwkt_port_t port; 466 467 port = tcp_addrport(inp->inp_faddr.s_addr, inp->inp_fport, 468 inp->inp_laddr.s_addr, inp->inp_lport); 469 if (port != &curthread->td_msgport) { 470 struct netmsg nmsg; 471 struct lwkt_msg *msg; 472 473 netmsg_init(&nmsg, &curthread->td_msgport, 0, 474 tcp_output_dispatch); 475 msg = &nmsg.nm_lmsg; 476 msg->u.ms_resultp = tp; 477 478 error = lwkt_domsg(port, msg, 0); 479 } else 480 #endif 481 error = tcp_output(tp); 482 return error; 483 } 484 485 /* 486 * Initiate connection to peer. 487 * Create a template for use in transmissions on this connection. 488 * Enter SYN_SENT state, and mark socket as connecting. 489 * Start keep-alive timer, and seed output sequence space. 490 * Send initial segment on connection. 491 */ 492 static int 493 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 494 { 495 int error = 0; 496 struct inpcb *inp; 497 struct tcpcb *tp; 498 struct sockaddr_in *sinp; 499 500 COMMON_START(so, inp, 0); 501 502 /* 503 * Must disallow TCP ``connections'' to multicast addresses. 504 */ 505 sinp = (struct sockaddr_in *)nam; 506 if (sinp->sin_family == AF_INET 507 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 508 error = EAFNOSUPPORT; 509 goto out; 510 } 511 512 if (!prison_remote_ip(td, (struct sockaddr*)sinp)) { 513 error = EAFNOSUPPORT; /* IPv6 only jail */ 514 goto out; 515 } 516 517 if ((error = tcp_connect(tp, nam, td)) != 0) 518 goto out; 519 520 error = tcp_conn_output(tp); 521 522 COMMON_END(PRU_CONNECT); 523 } 524 525 #ifdef INET6 526 static int 527 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 528 { 529 int error = 0; 530 struct inpcb *inp; 531 struct tcpcb *tp; 532 struct sockaddr_in6 *sin6p; 533 534 COMMON_START(so, inp, 0); 535 536 /* 537 * Must disallow TCP ``connections'' to multicast addresses. 538 */ 539 sin6p = (struct sockaddr_in6 *)nam; 540 if (sin6p->sin6_family == AF_INET6 541 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 542 error = EAFNOSUPPORT; 543 goto out; 544 } 545 546 if (!prison_remote_ip(td, nam)) { 547 error = EAFNOSUPPORT; /* IPv4 only jail */ 548 goto out; 549 } 550 551 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 552 struct sockaddr_in sin; 553 554 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 555 error = EINVAL; 556 goto out; 557 } 558 559 in6_sin6_2_sin(&sin, sin6p); 560 inp->inp_vflag |= INP_IPV4; 561 inp->inp_vflag &= ~INP_IPV6; 562 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 563 goto out; 564 error = tcp_conn_output(tp); 565 goto out; 566 } 567 inp->inp_vflag &= ~INP_IPV4; 568 inp->inp_vflag |= INP_IPV6; 569 inp->inp_inc.inc_isipv6 = 1; 570 if ((error = tcp6_connect(tp, nam, td)) != 0) 571 goto out; 572 error = tcp_output(tp); 573 COMMON_END(PRU_CONNECT); 574 } 575 #endif /* INET6 */ 576 577 /* 578 * Initiate disconnect from peer. 579 * If connection never passed embryonic stage, just drop; 580 * else if don't need to let data drain, then can just drop anyways, 581 * else have to begin TCP shutdown process: mark socket disconnecting, 582 * drain unread data, state switch to reflect user close, and 583 * send segment (e.g. FIN) to peer. Socket will be really disconnected 584 * when peer sends FIN and acks ours. 585 * 586 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 587 */ 588 static int 589 tcp_usr_disconnect(struct socket *so) 590 { 591 int error = 0; 592 struct inpcb *inp; 593 struct tcpcb *tp; 594 595 COMMON_START(so, inp, 1); 596 tp = tcp_disconnect(tp); 597 COMMON_END(PRU_DISCONNECT); 598 } 599 600 /* 601 * Accept a connection. Essentially all the work is 602 * done at higher levels; just return the address 603 * of the peer, storing through addr. 604 */ 605 static int 606 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 607 { 608 int error = 0; 609 struct inpcb *inp; 610 struct tcpcb *tp = NULL; 611 TCPDEBUG0; 612 613 crit_enter(); 614 inp = so->so_pcb; 615 if (so->so_state & SS_ISDISCONNECTED) { 616 error = ECONNABORTED; 617 goto out; 618 } 619 if (inp == 0) { 620 crit_exit(); 621 return (EINVAL); 622 } 623 tp = intotcpcb(inp); 624 TCPDEBUG1(); 625 in_setpeeraddr(so, nam); 626 COMMON_END(PRU_ACCEPT); 627 } 628 629 #ifdef INET6 630 static int 631 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 632 { 633 int error = 0; 634 struct inpcb *inp; 635 struct tcpcb *tp = NULL; 636 TCPDEBUG0; 637 638 crit_enter(); 639 inp = so->so_pcb; 640 641 if (so->so_state & SS_ISDISCONNECTED) { 642 error = ECONNABORTED; 643 goto out; 644 } 645 if (inp == 0) { 646 crit_exit(); 647 return (EINVAL); 648 } 649 tp = intotcpcb(inp); 650 TCPDEBUG1(); 651 in6_mapped_peeraddr(so, nam); 652 COMMON_END(PRU_ACCEPT); 653 } 654 #endif /* INET6 */ 655 /* 656 * Mark the connection as being incapable of further output. 657 */ 658 static int 659 tcp_usr_shutdown(struct socket *so) 660 { 661 int error = 0; 662 struct inpcb *inp; 663 struct tcpcb *tp; 664 665 COMMON_START(so, inp, 0); 666 socantsendmore(so); 667 tp = tcp_usrclosed(tp); 668 if (tp) 669 error = tcp_output(tp); 670 COMMON_END(PRU_SHUTDOWN); 671 } 672 673 /* 674 * After a receive, possibly send window update to peer. 675 */ 676 static int 677 tcp_usr_rcvd(struct socket *so, int flags) 678 { 679 int error = 0; 680 struct inpcb *inp; 681 struct tcpcb *tp; 682 683 COMMON_START(so, inp, 0); 684 tcp_output(tp); 685 COMMON_END(PRU_RCVD); 686 } 687 688 /* 689 * Do a send by putting data in output queue and updating urgent 690 * marker if URG set. Possibly send more data. Unlike the other 691 * pru_*() routines, the mbuf chains are our responsibility. We 692 * must either enqueue them or free them. The other pru_* routines 693 * generally are caller-frees. 694 */ 695 static int 696 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 697 struct sockaddr *nam, struct mbuf *control, struct thread *td) 698 { 699 int error = 0; 700 struct inpcb *inp; 701 struct tcpcb *tp; 702 #ifdef INET6 703 int isipv6; 704 #endif 705 TCPDEBUG0; 706 707 crit_enter(); 708 inp = so->so_pcb; 709 710 if (inp == NULL) { 711 /* 712 * OOPS! we lost a race, the TCP session got reset after 713 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a 714 * network interrupt in the non-critical section of sosend(). 715 */ 716 if (m) 717 m_freem(m); 718 if (control) 719 m_freem(control); 720 error = ECONNRESET; /* XXX EPIPE? */ 721 tp = NULL; 722 TCPDEBUG1(); 723 goto out; 724 } 725 #ifdef INET6 726 isipv6 = nam && nam->sa_family == AF_INET6; 727 #endif /* INET6 */ 728 tp = intotcpcb(inp); 729 TCPDEBUG1(); 730 if (control) { 731 /* TCP doesn't do control messages (rights, creds, etc) */ 732 if (control->m_len) { 733 m_freem(control); 734 if (m) 735 m_freem(m); 736 error = EINVAL; 737 goto out; 738 } 739 m_freem(control); /* empty control, just free it */ 740 } 741 if(!(flags & PRUS_OOB)) { 742 ssb_appendstream(&so->so_snd, m); 743 if (nam && tp->t_state < TCPS_SYN_SENT) { 744 /* 745 * Do implied connect if not yet connected, 746 * initialize window to default value, and 747 * initialize maxseg/maxopd using peer's cached 748 * MSS. 749 */ 750 #ifdef INET6 751 if (isipv6) 752 error = tcp6_connect(tp, nam, td); 753 else 754 #endif /* INET6 */ 755 error = tcp_connect(tp, nam, td); 756 if (error) 757 goto out; 758 tp->snd_wnd = TTCP_CLIENT_SND_WND; 759 tcp_mss(tp, -1); 760 } 761 762 if (flags & PRUS_EOF) { 763 /* 764 * Close the send side of the connection after 765 * the data is sent. 766 */ 767 socantsendmore(so); 768 tp = tcp_usrclosed(tp); 769 } 770 if (tp != NULL) { 771 if (flags & PRUS_MORETOCOME) 772 tp->t_flags |= TF_MORETOCOME; 773 error = tcp_output(tp); 774 if (flags & PRUS_MORETOCOME) 775 tp->t_flags &= ~TF_MORETOCOME; 776 } 777 } else { 778 if (ssb_space(&so->so_snd) < -512) { 779 m_freem(m); 780 error = ENOBUFS; 781 goto out; 782 } 783 /* 784 * According to RFC961 (Assigned Protocols), 785 * the urgent pointer points to the last octet 786 * of urgent data. We continue, however, 787 * to consider it to indicate the first octet 788 * of data past the urgent section. 789 * Otherwise, snd_up should be one lower. 790 */ 791 ssb_appendstream(&so->so_snd, m); 792 if (nam && tp->t_state < TCPS_SYN_SENT) { 793 /* 794 * Do implied connect if not yet connected, 795 * initialize window to default value, and 796 * initialize maxseg/maxopd using peer's cached 797 * MSS. 798 */ 799 #ifdef INET6 800 if (isipv6) 801 error = tcp6_connect(tp, nam, td); 802 else 803 #endif /* INET6 */ 804 error = tcp_connect(tp, nam, td); 805 if (error) 806 goto out; 807 tp->snd_wnd = TTCP_CLIENT_SND_WND; 808 tcp_mss(tp, -1); 809 } 810 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 811 tp->t_flags |= TF_FORCE; 812 error = tcp_output(tp); 813 tp->t_flags &= ~TF_FORCE; 814 } 815 COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB : 816 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 817 } 818 819 /* 820 * Abort the TCP. 821 */ 822 static int 823 tcp_usr_abort(struct socket *so) 824 { 825 int error = 0; 826 struct inpcb *inp; 827 struct tcpcb *tp; 828 829 COMMON_START(so, inp, 1); 830 tp = tcp_drop(tp, ECONNABORTED); 831 COMMON_END(PRU_ABORT); 832 } 833 834 /* 835 * Receive out-of-band data. 836 */ 837 static int 838 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 839 { 840 int error = 0; 841 struct inpcb *inp; 842 struct tcpcb *tp; 843 844 COMMON_START(so, inp, 0); 845 if ((so->so_oobmark == 0 && 846 (so->so_state & SS_RCVATMARK) == 0) || 847 so->so_options & SO_OOBINLINE || 848 tp->t_oobflags & TCPOOB_HADDATA) { 849 error = EINVAL; 850 goto out; 851 } 852 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 853 error = EWOULDBLOCK; 854 goto out; 855 } 856 m->m_len = 1; 857 *mtod(m, caddr_t) = tp->t_iobc; 858 if ((flags & MSG_PEEK) == 0) 859 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 860 COMMON_END(PRU_RCVOOB); 861 } 862 863 /* xxx - should be const */ 864 struct pr_usrreqs tcp_usrreqs = { 865 .pru_abort = tcp_usr_abort, 866 .pru_accept = tcp_usr_accept, 867 .pru_attach = tcp_usr_attach, 868 .pru_bind = tcp_usr_bind, 869 .pru_connect = tcp_usr_connect, 870 .pru_connect2 = pru_connect2_notsupp, 871 .pru_control = in_control, 872 .pru_detach = tcp_usr_detach, 873 .pru_disconnect = tcp_usr_disconnect, 874 .pru_listen = tcp_usr_listen, 875 .pru_peeraddr = in_setpeeraddr, 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 = in_setsockaddr, 882 .pru_sosend = sosend, 883 .pru_soreceive = soreceive, 884 .pru_sopoll = sopoll 885 }; 886 887 #ifdef INET6 888 struct pr_usrreqs tcp6_usrreqs = { 889 .pru_abort = tcp_usr_abort, 890 .pru_accept = tcp6_usr_accept, 891 .pru_attach = tcp_usr_attach, 892 .pru_bind = tcp6_usr_bind, 893 .pru_connect = tcp6_usr_connect, 894 .pru_connect2 = pru_connect2_notsupp, 895 .pru_control = in6_control, 896 .pru_detach = tcp_usr_detach, 897 .pru_disconnect = tcp_usr_disconnect, 898 .pru_listen = tcp6_usr_listen, 899 .pru_peeraddr = in6_mapped_peeraddr, 900 .pru_rcvd = tcp_usr_rcvd, 901 .pru_rcvoob = tcp_usr_rcvoob, 902 .pru_send = tcp_usr_send, 903 .pru_sense = pru_sense_null, 904 .pru_shutdown = tcp_usr_shutdown, 905 .pru_sockaddr = in6_mapped_sockaddr, 906 .pru_sosend = sosend, 907 .pru_soreceive = soreceive, 908 .pru_sopoll = sopoll 909 }; 910 #endif /* INET6 */ 911 912 static int 913 tcp_connect_oncpu(struct tcpcb *tp, struct sockaddr_in *sin, 914 struct sockaddr_in *if_sin) 915 { 916 struct inpcb *inp = tp->t_inpcb, *oinp; 917 struct socket *so = inp->inp_socket; 918 struct route *ro = &inp->inp_route; 919 struct tcpcb *otp; 920 struct rmxp_tao *taop; 921 struct rmxp_tao tao_noncached; 922 923 oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid], 924 sin->sin_addr, sin->sin_port, 925 inp->inp_laddr.s_addr != INADDR_ANY ? 926 inp->inp_laddr : if_sin->sin_addr, 927 inp->inp_lport, 0, NULL); 928 if (oinp != NULL) { 929 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL && 930 otp->t_state == TCPS_TIME_WAIT && 931 (ticks - otp->t_starttime) < tcp_msl && 932 (otp->t_flags & TF_RCVD_CC)) 933 tcp_close(otp); 934 else 935 return (EADDRINUSE); 936 } 937 if (inp->inp_laddr.s_addr == INADDR_ANY) 938 inp->inp_laddr = if_sin->sin_addr; 939 inp->inp_faddr = sin->sin_addr; 940 inp->inp_fport = sin->sin_port; 941 inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid]; 942 in_pcbinsconnhash(inp); 943 944 /* 945 * We are now on the inpcb's owner CPU, if the cached route was 946 * freed because the rtentry's owner CPU is not the current CPU 947 * (e.g. in tcp_connect()), then we try to reallocate it here with 948 * the hope that a rtentry may be cloned from a RTF_PRCLONING 949 * rtentry. 950 */ 951 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/ 952 ro->ro_rt == NULL) { 953 bzero(&ro->ro_dst, sizeof(struct sockaddr_in)); 954 ro->ro_dst.sa_family = AF_INET; 955 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 956 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = 957 sin->sin_addr; 958 rtalloc(ro); 959 } 960 961 /* 962 * Create TCP timer message now; we are on the tcpcb's owner 963 * CPU/thread. 964 */ 965 tcp_create_timermsg(tp, &curthread->td_msgport); 966 967 /* 968 * Compute window scaling to request. Use a larger scaling then 969 * needed for the initial receive buffer in case the receive buffer 970 * gets expanded. 971 */ 972 if (tp->request_r_scale < TCP_MIN_WINSHIFT) 973 tp->request_r_scale = TCP_MIN_WINSHIFT; 974 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 975 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat 976 ) { 977 tp->request_r_scale++; 978 } 979 980 soisconnecting(so); 981 tcpstat.tcps_connattempt++; 982 tp->t_state = TCPS_SYN_SENT; 983 tcp_callout_reset(tp, tp->tt_keep, tcp_keepinit, tcp_timer_keep); 984 tp->iss = tcp_new_isn(tp); 985 tcp_sendseqinit(tp); 986 987 /* 988 * Generate a CC value for this connection and 989 * check whether CC or CCnew should be used. 990 */ 991 if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) { 992 taop = &tao_noncached; 993 bzero(taop, sizeof *taop); 994 } 995 996 tp->cc_send = CC_INC(tcp_ccgen); 997 if (taop->tao_ccsent != 0 && 998 CC_GEQ(tp->cc_send, taop->tao_ccsent)) { 999 taop->tao_ccsent = tp->cc_send; 1000 } else { 1001 taop->tao_ccsent = 0; 1002 tp->t_flags |= TF_SENDCCNEW; 1003 } 1004 1005 return (0); 1006 } 1007 1008 #ifdef SMP 1009 1010 struct netmsg_tcp_connect { 1011 struct netmsg nm_netmsg; 1012 struct tcpcb *nm_tp; 1013 struct sockaddr_in *nm_sin; 1014 struct sockaddr_in *nm_ifsin; 1015 }; 1016 1017 static void 1018 tcp_connect_handler(netmsg_t netmsg) 1019 { 1020 struct netmsg_tcp_connect *msg = (void *)netmsg; 1021 int error; 1022 1023 error = tcp_connect_oncpu(msg->nm_tp, msg->nm_sin, msg->nm_ifsin); 1024 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, error); 1025 } 1026 1027 struct netmsg_tcp6_connect { 1028 struct netmsg nm_netmsg; 1029 struct tcpcb *nm_tp; 1030 struct sockaddr_in6 *nm_sin6; 1031 struct in6_addr *nm_addr6; 1032 }; 1033 1034 static void 1035 tcp6_connect_handler(netmsg_t netmsg) 1036 { 1037 struct netmsg_tcp6_connect *msg = (void *)netmsg; 1038 int error; 1039 1040 error = tcp6_connect_oncpu(msg->nm_tp, msg->nm_sin6, msg->nm_addr6); 1041 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, error); 1042 } 1043 1044 #endif 1045 1046 /* 1047 * Common subroutine to open a TCP connection to remote host specified 1048 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1049 * port number if needed. Call in_pcbladdr to do the routing and to choose 1050 * a local host address (interface). If there is an existing incarnation 1051 * of the same connection in TIME-WAIT state and if the remote host was 1052 * sending CC options and if the connection duration was < MSL, then 1053 * truncate the previous TIME-WAIT state and proceed. 1054 * Initialize connection parameters and enter SYN-SENT state. 1055 */ 1056 static int 1057 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1058 { 1059 struct inpcb *inp = tp->t_inpcb; 1060 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 1061 struct sockaddr_in *if_sin; 1062 int error; 1063 #ifdef SMP 1064 lwkt_port_t port; 1065 #endif 1066 1067 if (inp->inp_lport == 0) { 1068 error = in_pcbbind(inp, NULL, td); 1069 if (error) 1070 return (error); 1071 } 1072 1073 /* 1074 * Cannot simply call in_pcbconnect, because there might be an 1075 * earlier incarnation of this same connection still in 1076 * TIME_WAIT state, creating an ADDRINUSE error. 1077 */ 1078 error = in_pcbladdr(inp, nam, &if_sin, td); 1079 if (error) 1080 return (error); 1081 1082 #ifdef SMP 1083 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port, 1084 inp->inp_laddr.s_addr ? 1085 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr, 1086 inp->inp_lport); 1087 1088 if (port != &curthread->td_msgport) { 1089 struct netmsg_tcp_connect msg; 1090 struct route *ro = &inp->inp_route; 1091 1092 /* 1093 * in_pcbladdr() may have allocated a route entry for us 1094 * on the current CPU, but we need a route entry on the 1095 * inpcb's owner CPU, so free it here. 1096 */ 1097 if (ro->ro_rt != NULL) 1098 RTFREE(ro->ro_rt); 1099 bzero(ro, sizeof(*ro)); 1100 1101 netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0, 1102 tcp_connect_handler); 1103 msg.nm_tp = tp; 1104 msg.nm_sin = sin; 1105 msg.nm_ifsin = if_sin; 1106 error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0); 1107 } else 1108 #endif 1109 error = tcp_connect_oncpu(tp, sin, if_sin); 1110 1111 return (error); 1112 } 1113 1114 #ifdef INET6 1115 1116 static int 1117 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1118 { 1119 struct inpcb *inp = tp->t_inpcb; 1120 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 1121 struct in6_addr *addr6; 1122 #ifdef SMP 1123 lwkt_port_t port; 1124 #endif 1125 int error; 1126 1127 if (inp->inp_lport == 0) { 1128 error = in6_pcbbind(inp, NULL, td); 1129 if (error) 1130 return error; 1131 } 1132 1133 /* 1134 * Cannot simply call in_pcbconnect, because there might be an 1135 * earlier incarnation of this same connection still in 1136 * TIME_WAIT state, creating an ADDRINUSE error. 1137 */ 1138 error = in6_pcbladdr(inp, nam, &addr6, td); 1139 if (error) 1140 return error; 1141 1142 #ifdef SMP 1143 port = tcp6_addrport(); /* XXX hack for now, always cpu0 */ 1144 1145 if (port != &curthread->td_msgport) { 1146 struct netmsg_tcp6_connect msg; 1147 struct route *ro = &inp->inp_route; 1148 1149 /* 1150 * in_pcbladdr() may have allocated a route entry for us 1151 * on the current CPU, but we need a route entry on the 1152 * inpcb's owner CPU, so free it here. 1153 */ 1154 if (ro->ro_rt != NULL) 1155 RTFREE(ro->ro_rt); 1156 bzero(ro, sizeof(*ro)); 1157 1158 netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0, 1159 tcp6_connect_handler); 1160 msg.nm_tp = tp; 1161 msg.nm_sin6 = sin6; 1162 msg.nm_addr6 = addr6; 1163 error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0); 1164 } else 1165 #endif 1166 error = tcp6_connect_oncpu(tp, sin6, addr6); 1167 1168 return (error); 1169 } 1170 1171 static int 1172 tcp6_connect_oncpu(struct tcpcb *tp, struct sockaddr_in6 *sin6, 1173 struct in6_addr *addr6) 1174 { 1175 struct inpcb *inp = tp->t_inpcb; 1176 struct socket *so = inp->inp_socket; 1177 struct inpcb *oinp; 1178 struct tcpcb *otp; 1179 struct rmxp_tao *taop; 1180 struct rmxp_tao tao_noncached; 1181 1182 oinp = in6_pcblookup_hash(inp->inp_cpcbinfo, 1183 &sin6->sin6_addr, sin6->sin6_port, 1184 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ? 1185 addr6 : &inp->in6p_laddr, 1186 inp->inp_lport, 0, NULL); 1187 if (oinp) { 1188 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL && 1189 otp->t_state == TCPS_TIME_WAIT && 1190 (ticks - otp->t_starttime) < tcp_msl && 1191 (otp->t_flags & TF_RCVD_CC)) 1192 otp = tcp_close(otp); 1193 else 1194 return (EADDRINUSE); 1195 } 1196 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1197 inp->in6p_laddr = *addr6; 1198 inp->in6p_faddr = sin6->sin6_addr; 1199 inp->inp_fport = sin6->sin6_port; 1200 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0) 1201 inp->in6p_flowinfo = sin6->sin6_flowinfo; 1202 in_pcbinsconnhash(inp); 1203 1204 /* NOTE: must be done in tcpcb's owner thread */ 1205 tcp_create_timermsg(tp, &curthread->td_msgport); 1206 1207 /* Compute window scaling to request. */ 1208 if (tp->request_r_scale < TCP_MIN_WINSHIFT) 1209 tp->request_r_scale = TCP_MIN_WINSHIFT; 1210 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1211 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) { 1212 tp->request_r_scale++; 1213 } 1214 1215 soisconnecting(so); 1216 tcpstat.tcps_connattempt++; 1217 tp->t_state = TCPS_SYN_SENT; 1218 tcp_callout_reset(tp, tp->tt_keep, tcp_keepinit, tcp_timer_keep); 1219 tp->iss = tcp_new_isn(tp); 1220 tcp_sendseqinit(tp); 1221 1222 /* 1223 * Generate a CC value for this connection and 1224 * check whether CC or CCnew should be used. 1225 */ 1226 if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) { 1227 taop = &tao_noncached; 1228 bzero(taop, sizeof *taop); 1229 } 1230 1231 tp->cc_send = CC_INC(tcp_ccgen); 1232 if (taop->tao_ccsent != 0 && 1233 CC_GEQ(tp->cc_send, taop->tao_ccsent)) { 1234 taop->tao_ccsent = tp->cc_send; 1235 } else { 1236 taop->tao_ccsent = 0; 1237 tp->t_flags |= TF_SENDCCNEW; 1238 } 1239 1240 return (0); 1241 } 1242 1243 #endif /* INET6 */ 1244 1245 /* 1246 * The new sockopt interface makes it possible for us to block in the 1247 * copyin/out step (if we take a page fault). Taking a page fault while 1248 * in a critical section is probably a Bad Thing. (Since sockets and pcbs 1249 * both now use TSM, there probably isn't any need for this function to 1250 * run in a critical section any more. This needs more examination.) 1251 */ 1252 int 1253 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1254 { 1255 int error, opt, optval; 1256 struct inpcb *inp; 1257 struct tcpcb *tp; 1258 1259 error = 0; 1260 crit_enter(); /* XXX */ 1261 inp = so->so_pcb; 1262 if (inp == NULL) { 1263 crit_exit(); 1264 return (ECONNRESET); 1265 } 1266 if (sopt->sopt_level != IPPROTO_TCP) { 1267 #ifdef INET6 1268 if (INP_CHECK_SOCKAF(so, AF_INET6)) 1269 error = ip6_ctloutput(so, sopt); 1270 else 1271 #endif /* INET6 */ 1272 error = ip_ctloutput(so, sopt); 1273 crit_exit(); 1274 return (error); 1275 } 1276 tp = intotcpcb(inp); 1277 1278 switch (sopt->sopt_dir) { 1279 case SOPT_SET: 1280 error = soopt_to_kbuf(sopt, &optval, sizeof optval, 1281 sizeof optval); 1282 if (error) 1283 break; 1284 switch (sopt->sopt_name) { 1285 case TCP_NODELAY: 1286 case TCP_NOOPT: 1287 switch (sopt->sopt_name) { 1288 case TCP_NODELAY: 1289 opt = TF_NODELAY; 1290 break; 1291 case TCP_NOOPT: 1292 opt = TF_NOOPT; 1293 break; 1294 default: 1295 opt = 0; /* dead code to fool gcc */ 1296 break; 1297 } 1298 1299 if (optval) 1300 tp->t_flags |= opt; 1301 else 1302 tp->t_flags &= ~opt; 1303 break; 1304 1305 case TCP_NOPUSH: 1306 if (optval) 1307 tp->t_flags |= TF_NOPUSH; 1308 else { 1309 tp->t_flags &= ~TF_NOPUSH; 1310 error = tcp_output(tp); 1311 } 1312 break; 1313 1314 case TCP_MAXSEG: 1315 /* 1316 * Must be between 0 and maxseg. If the requested 1317 * maxseg is too small to satisfy the desired minmss, 1318 * pump it up (silently so sysctl modifications of 1319 * minmss do not create unexpected program failures). 1320 * Handle degenerate cases. 1321 */ 1322 if (optval > 0 && optval <= tp->t_maxseg) { 1323 if (optval + 40 < tcp_minmss) { 1324 optval = tcp_minmss - 40; 1325 if (optval < 0) 1326 optval = 1; 1327 } 1328 tp->t_maxseg = optval; 1329 } else { 1330 error = EINVAL; 1331 } 1332 break; 1333 1334 default: 1335 error = ENOPROTOOPT; 1336 break; 1337 } 1338 break; 1339 1340 case SOPT_GET: 1341 switch (sopt->sopt_name) { 1342 case TCP_NODELAY: 1343 optval = tp->t_flags & TF_NODELAY; 1344 break; 1345 case TCP_MAXSEG: 1346 optval = tp->t_maxseg; 1347 break; 1348 case TCP_NOOPT: 1349 optval = tp->t_flags & TF_NOOPT; 1350 break; 1351 case TCP_NOPUSH: 1352 optval = tp->t_flags & TF_NOPUSH; 1353 break; 1354 default: 1355 error = ENOPROTOOPT; 1356 break; 1357 } 1358 if (error == 0) 1359 soopt_from_kbuf(sopt, &optval, sizeof optval); 1360 break; 1361 } 1362 crit_exit(); 1363 return (error); 1364 } 1365 1366 /* 1367 * tcp_sendspace and tcp_recvspace are the default send and receive window 1368 * sizes, respectively. These are obsolescent (this information should 1369 * be set by the route). 1370 * 1371 * Use a default that does not require tcp window scaling to be turned 1372 * on. Individual programs or the administrator can increase the default. 1373 */ 1374 u_long tcp_sendspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ 1375 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, 1376 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); 1377 u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ 1378 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 1379 &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); 1380 1381 /* 1382 * Attach TCP protocol to socket, allocating 1383 * internet protocol control block, tcp control block, 1384 * bufer space, and entering LISTEN state if to accept connections. 1385 */ 1386 static int 1387 tcp_attach(struct socket *so, struct pru_attach_info *ai) 1388 { 1389 struct tcpcb *tp; 1390 struct inpcb *inp; 1391 int error; 1392 int cpu; 1393 #ifdef INET6 1394 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0; 1395 #endif 1396 1397 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) { 1398 error = soreserve(so, tcp_sendspace, tcp_recvspace, 1399 ai->sb_rlimit); 1400 if (error) 1401 return (error); 1402 } 1403 so->so_rcv.ssb_flags |= SSB_AUTOSIZE; 1404 so->so_snd.ssb_flags |= SSB_AUTOSIZE; 1405 cpu = mycpu->gd_cpuid; 1406 error = in_pcballoc(so, &tcbinfo[cpu]); 1407 if (error) 1408 return (error); 1409 inp = so->so_pcb; 1410 #ifdef INET6 1411 if (isipv6) { 1412 inp->inp_vflag |= INP_IPV6; 1413 inp->in6p_hops = -1; /* use kernel default */ 1414 } 1415 else 1416 #endif 1417 inp->inp_vflag |= INP_IPV4; 1418 tp = tcp_newtcpcb(inp); 1419 if (tp == 0) { 1420 int nofd = so->so_state & SS_NOFDREF; /* XXX */ 1421 1422 so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */ 1423 #ifdef INET6 1424 if (isipv6) 1425 in6_pcbdetach(inp); 1426 else 1427 #endif 1428 in_pcbdetach(inp); 1429 so->so_state |= nofd; 1430 return (ENOBUFS); 1431 } 1432 tp->t_state = TCPS_CLOSED; 1433 return (0); 1434 } 1435 1436 /* 1437 * Initiate (or continue) disconnect. 1438 * If embryonic state, just send reset (once). 1439 * If in ``let data drain'' option and linger null, just drop. 1440 * Otherwise (hard), mark socket disconnecting and drop 1441 * current input data; switch states based on user close, and 1442 * send segment to peer (with FIN). 1443 */ 1444 static struct tcpcb * 1445 tcp_disconnect(struct tcpcb *tp) 1446 { 1447 struct socket *so = tp->t_inpcb->inp_socket; 1448 1449 if (tp->t_state < TCPS_ESTABLISHED) 1450 tp = tcp_close(tp); 1451 else if ((so->so_options & SO_LINGER) && so->so_linger == 0) 1452 tp = tcp_drop(tp, 0); 1453 else { 1454 soisdisconnecting(so); 1455 sbflush(&so->so_rcv.sb); 1456 tp = tcp_usrclosed(tp); 1457 if (tp) 1458 tcp_output(tp); 1459 } 1460 return (tp); 1461 } 1462 1463 /* 1464 * User issued close, and wish to trail through shutdown states: 1465 * if never received SYN, just forget it. If got a SYN from peer, 1466 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1467 * If already got a FIN from peer, then almost done; go to LAST_ACK 1468 * state. In all other cases, have already sent FIN to peer (e.g. 1469 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1470 * for peer to send FIN or not respond to keep-alives, etc. 1471 * We can let the user exit from the close as soon as the FIN is acked. 1472 */ 1473 static struct tcpcb * 1474 tcp_usrclosed(struct tcpcb *tp) 1475 { 1476 1477 switch (tp->t_state) { 1478 1479 case TCPS_CLOSED: 1480 case TCPS_LISTEN: 1481 tp->t_state = TCPS_CLOSED; 1482 tp = tcp_close(tp); 1483 break; 1484 1485 case TCPS_SYN_SENT: 1486 case TCPS_SYN_RECEIVED: 1487 tp->t_flags |= TF_NEEDFIN; 1488 break; 1489 1490 case TCPS_ESTABLISHED: 1491 tp->t_state = TCPS_FIN_WAIT_1; 1492 break; 1493 1494 case TCPS_CLOSE_WAIT: 1495 tp->t_state = TCPS_LAST_ACK; 1496 break; 1497 } 1498 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) { 1499 soisdisconnected(tp->t_inpcb->inp_socket); 1500 /* To prevent the connection hanging in FIN_WAIT_2 forever. */ 1501 if (tp->t_state == TCPS_FIN_WAIT_2) { 1502 tcp_callout_reset(tp, tp->tt_2msl, tcp_maxidle, 1503 tcp_timer_2msl); 1504 } 1505 } 1506 return (tp); 1507 } 1508