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_inet.h" 73 #include "opt_inet6.h" 74 #include "opt_tcpdebug.h" 75 76 #include <sys/param.h> 77 #include <sys/systm.h> 78 #include <sys/kernel.h> 79 #include <sys/malloc.h> 80 #include <sys/sysctl.h> 81 #include <sys/globaldata.h> 82 #include <sys/thread.h> 83 84 #include <sys/mbuf.h> 85 #ifdef INET6 86 #include <sys/domain.h> 87 #endif /* INET6 */ 88 #include <sys/socket.h> 89 #include <sys/socketvar.h> 90 #include <sys/protosw.h> 91 92 #include <sys/thread2.h> 93 #include <sys/msgport2.h> 94 #include <sys/socketvar2.h> 95 96 #include <net/if.h> 97 #include <net/netisr.h> 98 #include <net/route.h> 99 100 #include <net/netmsg2.h> 101 102 #include <netinet/in.h> 103 #include <netinet/in_systm.h> 104 #ifdef INET6 105 #include <netinet/ip6.h> 106 #endif 107 #include <netinet/in_pcb.h> 108 #ifdef INET6 109 #include <netinet6/in6_pcb.h> 110 #endif 111 #include <netinet/in_var.h> 112 #include <netinet/ip_var.h> 113 #ifdef INET6 114 #include <netinet6/ip6_var.h> 115 #include <netinet6/tcp6_var.h> 116 #endif 117 #include <netinet/tcp.h> 118 #include <netinet/tcp_fsm.h> 119 #include <netinet/tcp_seq.h> 120 #include <netinet/tcp_timer.h> 121 #include <netinet/tcp_timer2.h> 122 #include <netinet/tcp_var.h> 123 #include <netinet/tcpip.h> 124 #ifdef TCPDEBUG 125 #include <netinet/tcp_debug.h> 126 #endif 127 128 #ifdef IPSEC 129 #include <netinet6/ipsec.h> 130 #endif /*IPSEC*/ 131 132 /* 133 * TCP protocol interface to socket abstraction. 134 */ 135 extern char *tcpstates[]; /* XXX ??? */ 136 137 static int tcp_attach (struct socket *, struct pru_attach_info *); 138 static int tcp_connect (struct tcpcb *, int flags, struct mbuf *m, 139 struct sockaddr *, struct thread *); 140 #ifdef INET6 141 static int tcp6_connect (struct tcpcb *, int flags, struct mbuf *m, 142 struct sockaddr *, struct thread *); 143 static int tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m, 144 struct sockaddr_in6 *sin6, 145 struct in6_addr *addr6); 146 #endif /* INET6 */ 147 static struct tcpcb * 148 tcp_disconnect (struct tcpcb *); 149 static struct tcpcb * 150 tcp_usrclosed (struct tcpcb *); 151 152 #ifdef TCPDEBUG 153 #define TCPDEBUG0 int ostate = 0 154 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 155 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 156 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 157 #else 158 #define TCPDEBUG0 159 #define TCPDEBUG1() 160 #define TCPDEBUG2(req) 161 #endif 162 163 /* 164 * TCP attaches to socket via pru_attach(), reserving space, 165 * and an internet control block. This is likely occuring on 166 * cpu0 and may have to move later when we bind/connect. 167 */ 168 static int 169 tcp_usr_attach(struct socket *so, int proto, struct pru_attach_info *ai) 170 { 171 int error; 172 struct inpcb *inp; 173 struct tcpcb *tp = 0; 174 TCPDEBUG0; 175 176 soreference(so); 177 inp = so->so_pcb; 178 TCPDEBUG1(); 179 if (inp) { 180 error = EISCONN; 181 goto out; 182 } 183 184 error = tcp_attach(so, ai); 185 if (error) 186 goto out; 187 188 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 189 so->so_linger = TCP_LINGERTIME; 190 tp = sototcpcb(so); 191 out: 192 sofree(so); /* from ref above */ 193 TCPDEBUG2(PRU_ATTACH); 194 return error; 195 } 196 197 /* 198 * pru_detach() detaches the TCP protocol from the socket. 199 * If the protocol state is non-embryonic, then can't 200 * do this directly: have to initiate a pru_disconnect(), 201 * which may finish later; embryonic TCB's can just 202 * be discarded here. 203 */ 204 static int 205 tcp_usr_detach(struct socket *so) 206 { 207 int error = 0; 208 struct inpcb *inp; 209 struct tcpcb *tp; 210 TCPDEBUG0; 211 212 inp = so->so_pcb; 213 214 /* 215 * If the inp is already detached it may have been due to an async 216 * close. Just return as if no error occured. 217 */ 218 if (inp == NULL) 219 return 0; 220 221 /* 222 * It's possible for the tcpcb (tp) to disconnect from the inp due 223 * to tcp_drop()->tcp_close() being called. This may occur *after* 224 * the detach message has been queued so we may find a NULL tp here. 225 */ 226 if ((tp = intotcpcb(inp)) != NULL) { 227 TCPDEBUG1(); 228 tp = tcp_disconnect(tp); 229 TCPDEBUG2(PRU_DETACH); 230 } 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 inp = so->so_pcb; \ 243 do { \ 244 if (inp == NULL) { \ 245 return (ignore_error ? 0 : EINVAL); \ 246 } \ 247 tp = intotcpcb(inp); \ 248 TCPDEBUG1(); \ 249 } while(0) 250 251 #define COMMON_END(req) out: TCPDEBUG2(req); return error; goto out 252 253 /* 254 * Give the socket an address. 255 */ 256 static int 257 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 258 { 259 int error = 0; 260 struct inpcb *inp; 261 struct tcpcb *tp; 262 struct sockaddr_in *sinp; 263 264 COMMON_START(so, inp, 0); 265 266 /* 267 * Must check for multicast addresses and disallow binding 268 * to them. 269 */ 270 sinp = (struct sockaddr_in *)nam; 271 if (sinp->sin_family == AF_INET && 272 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 273 error = EAFNOSUPPORT; 274 goto out; 275 } 276 error = in_pcbbind(inp, nam, td); 277 if (error) 278 goto out; 279 COMMON_END(PRU_BIND); 280 281 } 282 283 #ifdef INET6 284 static int 285 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 286 { 287 int error = 0; 288 struct inpcb *inp; 289 struct tcpcb *tp; 290 struct sockaddr_in6 *sin6p; 291 292 COMMON_START(so, inp, 0); 293 294 /* 295 * Must check for multicast addresses and disallow binding 296 * to them. 297 */ 298 sin6p = (struct sockaddr_in6 *)nam; 299 if (sin6p->sin6_family == AF_INET6 && 300 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 301 error = EAFNOSUPPORT; 302 goto out; 303 } 304 inp->inp_vflag &= ~INP_IPV4; 305 inp->inp_vflag |= INP_IPV6; 306 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 307 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 308 inp->inp_vflag |= INP_IPV4; 309 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 310 struct sockaddr_in sin; 311 312 in6_sin6_2_sin(&sin, sin6p); 313 inp->inp_vflag |= INP_IPV4; 314 inp->inp_vflag &= ~INP_IPV6; 315 error = in_pcbbind(inp, (struct sockaddr *)&sin, td); 316 goto out; 317 } 318 } 319 error = in6_pcbbind(inp, nam, td); 320 if (error) 321 goto out; 322 COMMON_END(PRU_BIND); 323 } 324 #endif /* INET6 */ 325 326 #ifdef SMP 327 struct netmsg_inswildcard { 328 struct netmsg nm_netmsg; 329 struct inpcb *nm_inp; 330 struct inpcbinfo *nm_pcbinfo; 331 }; 332 333 static void 334 in_pcbinswildcardhash_handler(struct netmsg *msg0) 335 { 336 struct netmsg_inswildcard *msg = (struct netmsg_inswildcard *)msg0; 337 338 in_pcbinswildcardhash_oncpu(msg->nm_inp, msg->nm_pcbinfo); 339 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, 0); 340 } 341 #endif 342 343 /* 344 * Prepare to accept connections. 345 */ 346 static int 347 tcp_usr_listen(struct socket *so, struct thread *td) 348 { 349 int error = 0; 350 struct inpcb *inp; 351 struct tcpcb *tp; 352 #ifdef SMP 353 int cpu; 354 #endif 355 356 COMMON_START(so, inp, 0); 357 if (inp->inp_lport == 0) { 358 error = in_pcbbind(inp, NULL, td); 359 if (error != 0) 360 goto out; 361 } 362 363 tp->t_state = TCPS_LISTEN; 364 tp->tt_msg = NULL; /* Catch any invalid timer usage */ 365 #ifdef SMP 366 /* 367 * We have to set the flag because we can't have other cpus 368 * messing with our inp's flags. 369 */ 370 inp->inp_flags |= INP_WILDCARD_MP; 371 for (cpu = 0; cpu < ncpus2; cpu++) { 372 struct netmsg_inswildcard *msg; 373 374 if (cpu == mycpu->gd_cpuid) { 375 in_pcbinswildcardhash(inp); 376 continue; 377 } 378 379 msg = kmalloc(sizeof(struct netmsg_inswildcard), M_LWKTMSG, 380 M_INTWAIT); 381 netmsg_init(&msg->nm_netmsg, NULL, &netisr_afree_rport, 382 0, in_pcbinswildcardhash_handler); 383 msg->nm_inp = inp; 384 msg->nm_pcbinfo = &tcbinfo[cpu]; 385 lwkt_sendmsg(cpu_portfn(cpu), &msg->nm_netmsg.nm_lmsg); 386 } 387 #else 388 in_pcbinswildcardhash(inp); 389 #endif 390 COMMON_END(PRU_LISTEN); 391 } 392 393 #ifdef INET6 394 static int 395 tcp6_usr_listen(struct socket *so, struct thread *td) 396 { 397 int error = 0; 398 struct inpcb *inp; 399 struct tcpcb *tp; 400 #ifdef SMP 401 int cpu; 402 #endif 403 404 COMMON_START(so, inp, 0); 405 if (inp->inp_lport == 0) { 406 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) 407 inp->inp_vflag |= INP_IPV4; 408 else 409 inp->inp_vflag &= ~INP_IPV4; 410 error = in6_pcbbind(inp, NULL, td); 411 } 412 if (error == 0) 413 tp->t_state = TCPS_LISTEN; 414 #ifdef SMP 415 /* 416 * We have to set the flag because we can't have other cpus 417 * messing with our inp's flags. 418 */ 419 inp->inp_flags |= INP_WILDCARD_MP; 420 for (cpu = 0; cpu < ncpus2; cpu++) { 421 struct netmsg_inswildcard *msg; 422 423 if (cpu == mycpu->gd_cpuid) { 424 in_pcbinswildcardhash(inp); 425 continue; 426 } 427 428 msg = kmalloc(sizeof(struct netmsg_inswildcard), M_LWKTMSG, 429 M_INTWAIT); 430 netmsg_init(&msg->nm_netmsg, NULL, &netisr_afree_rport, 431 0, in_pcbinswildcardhash_handler); 432 msg->nm_inp = inp; 433 msg->nm_pcbinfo = &tcbinfo[cpu]; 434 lwkt_sendmsg(cpu_portfn(cpu), &msg->nm_netmsg.nm_lmsg); 435 } 436 #else 437 in_pcbinswildcardhash(inp); 438 #endif 439 COMMON_END(PRU_LISTEN); 440 } 441 #endif /* INET6 */ 442 443 /* 444 * Initiate connection to peer. 445 * Create a template for use in transmissions on this connection. 446 * Enter SYN_SENT state, and mark socket as connecting. 447 * Start keep-alive timer, and seed output sequence space. 448 * Send initial segment on connection. 449 */ 450 static int 451 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 452 { 453 int error = 0; 454 struct inpcb *inp; 455 struct tcpcb *tp; 456 struct sockaddr_in *sinp; 457 458 COMMON_START(so, inp, 0); 459 460 /* 461 * Must disallow TCP ``connections'' to multicast addresses. 462 */ 463 sinp = (struct sockaddr_in *)nam; 464 if (sinp->sin_family == AF_INET 465 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 466 error = EAFNOSUPPORT; 467 goto out; 468 } 469 470 if (!prison_remote_ip(td, (struct sockaddr*)sinp)) { 471 error = EAFNOSUPPORT; /* IPv6 only jail */ 472 goto out; 473 } 474 475 if ((error = tcp_connect(tp, 0, NULL, nam, td)) != 0) 476 goto out; 477 COMMON_END(PRU_CONNECT); 478 } 479 480 #ifdef INET6 481 static int 482 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 483 { 484 int error = 0; 485 struct inpcb *inp; 486 struct tcpcb *tp; 487 struct sockaddr_in6 *sin6p; 488 489 COMMON_START(so, inp, 0); 490 491 /* 492 * Must disallow TCP ``connections'' to multicast addresses. 493 */ 494 sin6p = (struct sockaddr_in6 *)nam; 495 if (sin6p->sin6_family == AF_INET6 496 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 497 error = EAFNOSUPPORT; 498 goto out; 499 } 500 501 if (!prison_remote_ip(td, nam)) { 502 error = EAFNOSUPPORT; /* IPv4 only jail */ 503 goto out; 504 } 505 506 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 507 struct sockaddr_in sin; 508 509 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 510 error = EINVAL; 511 goto out; 512 } 513 514 in6_sin6_2_sin(&sin, sin6p); 515 inp->inp_vflag |= INP_IPV4; 516 inp->inp_vflag &= ~INP_IPV6; 517 error = tcp_connect(tp, 0, NULL, (struct sockaddr *)&sin, td); 518 if (error) 519 goto out; 520 goto out; 521 } 522 inp->inp_vflag &= ~INP_IPV4; 523 inp->inp_vflag |= INP_IPV6; 524 inp->inp_inc.inc_isipv6 = 1; 525 if ((error = tcp6_connect(tp, 0, NULL, nam, td)) != 0) 526 goto out; 527 error = tcp_output(tp); 528 COMMON_END(PRU_CONNECT); 529 } 530 #endif /* INET6 */ 531 532 /* 533 * Initiate disconnect from peer. 534 * If connection never passed embryonic stage, just drop; 535 * else if don't need to let data drain, then can just drop anyways, 536 * else have to begin TCP shutdown process: mark socket disconnecting, 537 * drain unread data, state switch to reflect user close, and 538 * send segment (e.g. FIN) to peer. Socket will be really disconnected 539 * when peer sends FIN and acks ours. 540 * 541 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 542 */ 543 static int 544 tcp_usr_disconnect(struct socket *so) 545 { 546 int error = 0; 547 struct inpcb *inp; 548 struct tcpcb *tp; 549 550 COMMON_START(so, inp, 1); 551 tp = tcp_disconnect(tp); 552 COMMON_END(PRU_DISCONNECT); 553 } 554 555 /* 556 * Accept a connection. Essentially all the work is 557 * done at higher levels; just return the address 558 * of the peer, storing through addr. 559 */ 560 static int 561 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 562 { 563 int error = 0; 564 struct inpcb *inp; 565 struct tcpcb *tp = NULL; 566 TCPDEBUG0; 567 568 inp = so->so_pcb; 569 if (so->so_state & SS_ISDISCONNECTED) { 570 error = ECONNABORTED; 571 goto out; 572 } 573 if (inp == 0) 574 return (EINVAL); 575 576 tp = intotcpcb(inp); 577 TCPDEBUG1(); 578 in_setpeeraddr(so, nam); 579 COMMON_END(PRU_ACCEPT); 580 } 581 582 #ifdef INET6 583 static int 584 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 585 { 586 int error = 0; 587 struct inpcb *inp; 588 struct tcpcb *tp = NULL; 589 TCPDEBUG0; 590 591 inp = so->so_pcb; 592 593 if (so->so_state & SS_ISDISCONNECTED) { 594 error = ECONNABORTED; 595 goto out; 596 } 597 if (inp == 0) 598 return (EINVAL); 599 tp = intotcpcb(inp); 600 TCPDEBUG1(); 601 in6_mapped_peeraddr(so, nam); 602 COMMON_END(PRU_ACCEPT); 603 } 604 #endif /* INET6 */ 605 /* 606 * Mark the connection as being incapable of further output. 607 */ 608 static int 609 tcp_usr_shutdown(struct socket *so) 610 { 611 int error = 0; 612 struct inpcb *inp; 613 struct tcpcb *tp; 614 615 COMMON_START(so, inp, 0); 616 socantsendmore(so); 617 tp = tcp_usrclosed(tp); 618 if (tp) 619 error = tcp_output(tp); 620 COMMON_END(PRU_SHUTDOWN); 621 } 622 623 /* 624 * After a receive, possibly send window update to peer. 625 */ 626 static int 627 tcp_usr_rcvd(struct socket *so, int flags) 628 { 629 int error = 0; 630 struct inpcb *inp; 631 struct tcpcb *tp; 632 633 COMMON_START(so, inp, 0); 634 tcp_output(tp); 635 COMMON_END(PRU_RCVD); 636 } 637 638 /* 639 * Do a send by putting data in output queue and updating urgent 640 * marker if URG set. Possibly send more data. Unlike the other 641 * pru_*() routines, the mbuf chains are our responsibility. We 642 * must either enqueue them or free them. The other pru_* routines 643 * generally are caller-frees. 644 */ 645 static int 646 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 647 struct sockaddr *nam, struct mbuf *control, struct thread *td) 648 { 649 int error = 0; 650 struct inpcb *inp; 651 struct tcpcb *tp; 652 #ifdef INET6 653 int isipv6; 654 #endif 655 TCPDEBUG0; 656 657 inp = so->so_pcb; 658 659 if (inp == NULL) { 660 /* 661 * OOPS! we lost a race, the TCP session got reset after 662 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a 663 * network interrupt in the non-critical section of sosend(). 664 */ 665 m_freem(m); 666 if (control) 667 m_freem(control); 668 error = ECONNRESET; /* XXX EPIPE? */ 669 tp = NULL; 670 TCPDEBUG1(); 671 goto out; 672 } 673 #ifdef INET6 674 isipv6 = nam && nam->sa_family == AF_INET6; 675 #endif /* INET6 */ 676 tp = intotcpcb(inp); 677 TCPDEBUG1(); 678 if (control) { 679 /* TCP doesn't do control messages (rights, creds, etc) */ 680 if (control->m_len) { 681 m_freem(control); 682 m_freem(m); 683 error = EINVAL; 684 goto out; 685 } 686 m_freem(control); /* empty control, just free it */ 687 } 688 689 /* 690 * Don't let too much OOB data build up 691 */ 692 if (flags & PRUS_OOB) { 693 if (ssb_space(&so->so_snd) < -512) { 694 m_freem(m); 695 error = ENOBUFS; 696 goto out; 697 } 698 } 699 700 /* 701 * Do implied connect if not yet connected. Any data sent 702 * with the connect is handled by tcp_connect() and friends. 703 * 704 * NOTE! PROTOCOL THREAD MAY BE CHANGED BY THE CONNECT! 705 */ 706 if (nam && tp->t_state < TCPS_SYN_SENT) { 707 #ifdef INET6 708 if (isipv6) 709 error = tcp6_connect(tp, flags, m, nam, td); 710 else 711 #endif /* INET6 */ 712 error = tcp_connect(tp, flags, m, nam, td); 713 #if 0 714 /* WTF is this doing here? */ 715 tp->snd_wnd = TTCP_CLIENT_SND_WND; 716 tcp_mss(tp, -1); 717 #endif 718 goto out; 719 } 720 721 /* 722 * Pump the data into the socket. 723 */ 724 if (m) 725 ssb_appendstream(&so->so_snd, m); 726 if (flags & PRUS_OOB) { 727 /* 728 * According to RFC961 (Assigned Protocols), 729 * the urgent pointer points to the last octet 730 * of urgent data. We continue, however, 731 * to consider it to indicate the first octet 732 * of data past the urgent section. 733 * Otherwise, snd_up should be one lower. 734 */ 735 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 736 tp->t_flags |= TF_FORCE; 737 error = tcp_output(tp); 738 tp->t_flags &= ~TF_FORCE; 739 } else { 740 if (flags & PRUS_EOF) { 741 /* 742 * Close the send side of the connection after 743 * the data is sent. 744 */ 745 socantsendmore(so); 746 tp = tcp_usrclosed(tp); 747 } 748 if (tp != NULL) { 749 if (flags & PRUS_MORETOCOME) 750 tp->t_flags |= TF_MORETOCOME; 751 error = tcp_output(tp); 752 if (flags & PRUS_MORETOCOME) 753 tp->t_flags &= ~TF_MORETOCOME; 754 } 755 } 756 COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB : 757 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 758 } 759 760 /* 761 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort() 762 * will sofree() it when we return. 763 */ 764 static int 765 tcp_usr_abort(struct socket *so) 766 { 767 int error = 0; 768 struct inpcb *inp; 769 struct tcpcb *tp; 770 771 COMMON_START(so, inp, 1); 772 tp = tcp_drop(tp, ECONNABORTED); 773 COMMON_END(PRU_ABORT); 774 } 775 776 /* 777 * Receive out-of-band data. 778 */ 779 static int 780 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 781 { 782 int error = 0; 783 struct inpcb *inp; 784 struct tcpcb *tp; 785 786 COMMON_START(so, inp, 0); 787 if ((so->so_oobmark == 0 && 788 (so->so_state & SS_RCVATMARK) == 0) || 789 so->so_options & SO_OOBINLINE || 790 tp->t_oobflags & TCPOOB_HADDATA) { 791 error = EINVAL; 792 goto out; 793 } 794 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 795 error = EWOULDBLOCK; 796 goto out; 797 } 798 m->m_len = 1; 799 *mtod(m, caddr_t) = tp->t_iobc; 800 if ((flags & MSG_PEEK) == 0) 801 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 802 COMMON_END(PRU_RCVOOB); 803 } 804 805 /* xxx - should be const */ 806 struct pr_usrreqs tcp_usrreqs = { 807 .pru_abort = tcp_usr_abort, 808 .pru_accept = tcp_usr_accept, 809 .pru_attach = tcp_usr_attach, 810 .pru_bind = tcp_usr_bind, 811 .pru_connect = tcp_usr_connect, 812 .pru_connect2 = pru_connect2_notsupp, 813 .pru_control = in_control, 814 .pru_detach = tcp_usr_detach, 815 .pru_disconnect = tcp_usr_disconnect, 816 .pru_listen = tcp_usr_listen, 817 .pru_peeraddr = in_setpeeraddr, 818 .pru_rcvd = tcp_usr_rcvd, 819 .pru_rcvoob = tcp_usr_rcvoob, 820 .pru_send = tcp_usr_send, 821 .pru_sense = pru_sense_null, 822 .pru_shutdown = tcp_usr_shutdown, 823 .pru_sockaddr = in_setsockaddr, 824 .pru_sosend = sosend, 825 .pru_soreceive = soreceive 826 }; 827 828 #ifdef INET6 829 struct pr_usrreqs tcp6_usrreqs = { 830 .pru_abort = tcp_usr_abort, 831 .pru_accept = tcp6_usr_accept, 832 .pru_attach = tcp_usr_attach, 833 .pru_bind = tcp6_usr_bind, 834 .pru_connect = tcp6_usr_connect, 835 .pru_connect2 = pru_connect2_notsupp, 836 .pru_control = in6_control, 837 .pru_detach = tcp_usr_detach, 838 .pru_disconnect = tcp_usr_disconnect, 839 .pru_listen = tcp6_usr_listen, 840 .pru_peeraddr = in6_mapped_peeraddr, 841 .pru_rcvd = tcp_usr_rcvd, 842 .pru_rcvoob = tcp_usr_rcvoob, 843 .pru_send = tcp_usr_send, 844 .pru_sense = pru_sense_null, 845 .pru_shutdown = tcp_usr_shutdown, 846 .pru_sockaddr = in6_mapped_sockaddr, 847 .pru_sosend = sosend, 848 .pru_soreceive = soreceive 849 }; 850 #endif /* INET6 */ 851 852 static int 853 tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m, 854 struct sockaddr_in *sin, struct sockaddr_in *if_sin) 855 { 856 struct inpcb *inp = tp->t_inpcb, *oinp; 857 struct socket *so = inp->inp_socket; 858 struct route *ro = &inp->inp_route; 859 860 oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid], 861 sin->sin_addr, sin->sin_port, 862 inp->inp_laddr.s_addr != INADDR_ANY ? 863 inp->inp_laddr : if_sin->sin_addr, 864 inp->inp_lport, 0, NULL); 865 if (oinp != NULL) { 866 m_freem(m); 867 return (EADDRINUSE); 868 } 869 if (inp->inp_laddr.s_addr == INADDR_ANY) 870 inp->inp_laddr = if_sin->sin_addr; 871 inp->inp_faddr = sin->sin_addr; 872 inp->inp_fport = sin->sin_port; 873 inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid]; 874 in_pcbinsconnhash(inp); 875 876 /* 877 * We are now on the inpcb's owner CPU, if the cached route was 878 * freed because the rtentry's owner CPU is not the current CPU 879 * (e.g. in tcp_connect()), then we try to reallocate it here with 880 * the hope that a rtentry may be cloned from a RTF_PRCLONING 881 * rtentry. 882 */ 883 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/ 884 ro->ro_rt == NULL) { 885 bzero(&ro->ro_dst, sizeof(struct sockaddr_in)); 886 ro->ro_dst.sa_family = AF_INET; 887 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 888 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = 889 sin->sin_addr; 890 rtalloc(ro); 891 } 892 893 /* 894 * Now that no more errors can occur, change the protocol processing 895 * port to the current thread (which is the correct thread). 896 * 897 * Create TCP timer message now; we are on the tcpcb's owner 898 * CPU/thread. 899 */ 900 tcp_create_timermsg(tp, &curthread->td_msgport); 901 902 /* 903 * Compute window scaling to request. Use a larger scaling then 904 * needed for the initial receive buffer in case the receive buffer 905 * gets expanded. 906 */ 907 if (tp->request_r_scale < TCP_MIN_WINSHIFT) 908 tp->request_r_scale = TCP_MIN_WINSHIFT; 909 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 910 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat 911 ) { 912 tp->request_r_scale++; 913 } 914 915 soisconnecting(so); 916 tcpstat.tcps_connattempt++; 917 tp->t_state = TCPS_SYN_SENT; 918 tcp_callout_reset(tp, tp->tt_keep, tcp_keepinit, tcp_timer_keep); 919 tp->iss = tcp_new_isn(tp); 920 tcp_sendseqinit(tp); 921 if (m) { 922 ssb_appendstream(&so->so_snd, m); 923 m = NULL; 924 if (flags & PRUS_OOB) 925 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 926 } 927 928 /* 929 * Close the send side of the connection after 930 * the data is sent if flagged. 931 */ 932 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) { 933 socantsendmore(so); 934 tp = tcp_usrclosed(tp); 935 } 936 return (tcp_output(tp)); 937 } 938 939 #ifdef SMP 940 941 struct netmsg_tcp_connect { 942 struct netmsg nm_netmsg; 943 struct tcpcb *nm_tp; 944 struct sockaddr_in *nm_sin; 945 struct sockaddr_in *nm_ifsin; 946 int nm_flags; 947 struct mbuf *nm_m; 948 }; 949 950 /* 951 * This is called in the target protocol processing thread. We must 952 * re-link our pcb to the new tcpcb 953 */ 954 static void 955 tcp_connect_handler(netmsg_t netmsg) 956 { 957 struct netmsg_tcp_connect *msg = (void *)netmsg; 958 struct socket *so = netmsg->nm_so; 959 int error; 960 961 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 962 error = tcp_connect_oncpu(msg->nm_tp, msg->nm_flags, msg->nm_m, 963 msg->nm_sin, msg->nm_ifsin); 964 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, error); 965 } 966 967 struct netmsg_tcp6_connect { 968 struct netmsg nm_netmsg; 969 struct tcpcb *nm_tp; 970 struct sockaddr_in6 *nm_sin6; 971 struct in6_addr *nm_addr6; 972 int nm_flags; 973 struct mbuf *nm_m; 974 }; 975 976 #ifdef INET6 977 static void 978 tcp6_connect_handler(netmsg_t netmsg) 979 { 980 struct netmsg_tcp6_connect *msg = (void *)netmsg; 981 int error; 982 983 error = tcp6_connect_oncpu(msg->nm_tp, msg->nm_flags, msg->nm_m, 984 msg->nm_sin6, msg->nm_addr6); 985 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, error); 986 } 987 #endif 988 989 #endif /* SMP */ 990 991 /* 992 * Common subroutine to open a TCP connection to remote host specified 993 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 994 * port number if needed. Call in_pcbladdr to do the routing and to choose 995 * a local host address (interface). 996 * Initialize connection parameters and enter SYN-SENT state. 997 */ 998 static int 999 tcp_connect(struct tcpcb *tp, int flags, struct mbuf *m, 1000 struct sockaddr *nam, struct thread *td) 1001 { 1002 struct inpcb *inp = tp->t_inpcb; 1003 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 1004 struct sockaddr_in *if_sin; 1005 struct socket *so; 1006 int error; 1007 #ifdef SMP 1008 lwkt_port_t port; 1009 #endif 1010 1011 /* 1012 * Bind if we have to 1013 */ 1014 if (inp->inp_lport == 0) { 1015 error = in_pcbbind(inp, NULL, td); 1016 if (error) { 1017 m_freem(m); 1018 return (error); 1019 } 1020 } 1021 so = inp->inp_socket; 1022 KKASSERT(so); 1023 1024 /* 1025 * Calculate the correct protocol processing thread. The connect 1026 * operation must run there. Set the forwarding port before we 1027 * forward the message or it will get bounced right back to us. 1028 */ 1029 error = in_pcbladdr(inp, nam, &if_sin, td); 1030 if (error) { 1031 m_freem(m); 1032 return (error); 1033 } 1034 1035 #ifdef SMP 1036 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port, 1037 inp->inp_laddr.s_addr ? 1038 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr, 1039 inp->inp_lport); 1040 1041 if (port != &curthread->td_msgport) { 1042 struct netmsg_tcp_connect msg; 1043 struct route *ro = &inp->inp_route; 1044 1045 /* 1046 * in_pcbladdr() may have allocated a route entry for us 1047 * on the current CPU, but we need a route entry on the 1048 * inpcb's owner CPU, so free it here. 1049 */ 1050 if (ro->ro_rt != NULL) 1051 RTFREE(ro->ro_rt); 1052 bzero(ro, sizeof(*ro)); 1053 1054 /* 1055 * We are moving the protocol processing port the socket 1056 * is on, we have to unlink here and re-link on the 1057 * target cpu. 1058 */ 1059 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1060 sosetport(so, port); 1061 1062 netmsg_init(&msg.nm_netmsg, so, &curthread->td_msgport, 1063 0, tcp_connect_handler); 1064 msg.nm_tp = tp; 1065 msg.nm_sin = sin; 1066 msg.nm_ifsin = if_sin; 1067 msg.nm_flags = flags; 1068 msg.nm_m = m; 1069 error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0); 1070 } else { 1071 error = tcp_connect_oncpu(tp, flags, m, sin, if_sin); 1072 } 1073 #else 1074 KKASSERT(so->so_port == &curthread->td_msgport); 1075 error = tcp_connect_oncpu(tp, flags, m, sin, if_sin); 1076 #endif 1077 return (error); 1078 } 1079 1080 #ifdef INET6 1081 1082 static int 1083 tcp6_connect(struct tcpcb *tp, int flags, struct mbuf *m, 1084 struct sockaddr *nam, struct thread *td) 1085 { 1086 struct inpcb *inp = tp->t_inpcb; 1087 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 1088 struct in6_addr *addr6; 1089 #ifdef SMP 1090 lwkt_port_t port; 1091 #endif 1092 int error; 1093 1094 if (inp->inp_lport == 0) { 1095 error = in6_pcbbind(inp, NULL, td); 1096 if (error) { 1097 m_freem(m); 1098 return (error); 1099 } 1100 } 1101 1102 /* 1103 * Cannot simply call in_pcbconnect, because there might be an 1104 * earlier incarnation of this same connection still in 1105 * TIME_WAIT state, creating an ADDRINUSE error. 1106 */ 1107 error = in6_pcbladdr(inp, nam, &addr6, td); 1108 if (error) { 1109 m_freem(m); 1110 return (error); 1111 } 1112 1113 #ifdef SMP 1114 port = tcp6_addrport(); /* XXX hack for now, always cpu0 */ 1115 1116 if (port != &curthread->td_msgport) { 1117 struct netmsg_tcp6_connect msg; 1118 struct route *ro = &inp->inp_route; 1119 1120 /* 1121 * in_pcbladdr() may have allocated a route entry for us 1122 * on the current CPU, but we need a route entry on the 1123 * inpcb's owner CPU, so free it here. 1124 */ 1125 if (ro->ro_rt != NULL) 1126 RTFREE(ro->ro_rt); 1127 bzero(ro, sizeof(*ro)); 1128 1129 netmsg_init(&msg.nm_netmsg, NULL, &curthread->td_msgport, 1130 0, tcp6_connect_handler); 1131 msg.nm_tp = tp; 1132 msg.nm_sin6 = sin6; 1133 msg.nm_addr6 = addr6; 1134 msg.nm_flags = flags; 1135 msg.nm_m = m; 1136 error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0); 1137 } else { 1138 error = tcp6_connect_oncpu(tp, flags, m, sin6, addr6); 1139 } 1140 #else 1141 error = tcp6_connect_oncpu(tp, flags, m, sin6, addr6); 1142 #endif 1143 return (error); 1144 } 1145 1146 static int 1147 tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m, 1148 struct sockaddr_in6 *sin6, struct in6_addr *addr6) 1149 { 1150 struct inpcb *inp = tp->t_inpcb; 1151 struct socket *so = inp->inp_socket; 1152 struct inpcb *oinp; 1153 1154 /* 1155 * Cannot simply call in_pcbconnect, because there might be an 1156 * earlier incarnation of this same connection still in 1157 * TIME_WAIT state, creating an ADDRINUSE error. 1158 */ 1159 oinp = in6_pcblookup_hash(inp->inp_cpcbinfo, 1160 &sin6->sin6_addr, sin6->sin6_port, 1161 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ? 1162 addr6 : &inp->in6p_laddr, 1163 inp->inp_lport, 0, NULL); 1164 if (oinp) { 1165 m_freem(m); 1166 return (EADDRINUSE); 1167 } 1168 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1169 inp->in6p_laddr = *addr6; 1170 inp->in6p_faddr = sin6->sin6_addr; 1171 inp->inp_fport = sin6->sin6_port; 1172 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0) 1173 inp->in6p_flowinfo = sin6->sin6_flowinfo; 1174 in_pcbinsconnhash(inp); 1175 1176 /* 1177 * Now that no more errors can occur, change the protocol processing 1178 * port to the current thread (which is the correct thread). 1179 * 1180 * Create TCP timer message now; we are on the tcpcb's owner 1181 * CPU/thread. 1182 */ 1183 tcp_create_timermsg(tp, &curthread->td_msgport); 1184 1185 /* Compute window scaling to request. */ 1186 if (tp->request_r_scale < TCP_MIN_WINSHIFT) 1187 tp->request_r_scale = TCP_MIN_WINSHIFT; 1188 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1189 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) { 1190 tp->request_r_scale++; 1191 } 1192 1193 soisconnecting(so); 1194 tcpstat.tcps_connattempt++; 1195 tp->t_state = TCPS_SYN_SENT; 1196 tcp_callout_reset(tp, tp->tt_keep, tcp_keepinit, tcp_timer_keep); 1197 tp->iss = tcp_new_isn(tp); 1198 tcp_sendseqinit(tp); 1199 if (m) { 1200 ssb_appendstream(&so->so_snd, m); 1201 m = NULL; 1202 if (flags & PRUS_OOB) 1203 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 1204 } 1205 1206 /* 1207 * Close the send side of the connection after 1208 * the data is sent if flagged. 1209 */ 1210 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) { 1211 socantsendmore(so); 1212 tp = tcp_usrclosed(tp); 1213 } 1214 return (tcp_output(tp)); 1215 } 1216 1217 #endif /* INET6 */ 1218 1219 /* 1220 * The new sockopt interface makes it possible for us to block in the 1221 * copyin/out step (if we take a page fault). Taking a page fault while 1222 * in a critical section is probably a Bad Thing. (Since sockets and pcbs 1223 * both now use TSM, there probably isn't any need for this function to 1224 * run in a critical section any more. This needs more examination.) 1225 */ 1226 int 1227 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1228 { 1229 int error, opt, optval; 1230 struct inpcb *inp; 1231 struct tcpcb *tp; 1232 1233 error = 0; 1234 inp = so->so_pcb; 1235 if (inp == NULL) 1236 return (ECONNRESET); 1237 1238 if (sopt->sopt_level != IPPROTO_TCP) { 1239 #ifdef INET6 1240 if (INP_CHECK_SOCKAF(so, AF_INET6)) 1241 error = ip6_ctloutput(so, sopt); 1242 else 1243 #endif /* INET6 */ 1244 error = ip_ctloutput(so, sopt); 1245 return (error); 1246 } 1247 tp = intotcpcb(inp); 1248 1249 switch (sopt->sopt_dir) { 1250 case SOPT_SET: 1251 error = soopt_to_kbuf(sopt, &optval, sizeof optval, 1252 sizeof optval); 1253 if (error) 1254 break; 1255 switch (sopt->sopt_name) { 1256 #ifdef TCP_SIGNATURE 1257 case TCP_SIGNATURE_ENABLE: 1258 if (optval > 0) 1259 tp->t_flags |= TF_SIGNATURE; 1260 else 1261 tp->t_flags &= ~TF_SIGNATURE; 1262 break; 1263 #endif /* TCP_SIGNATURE */ 1264 case TCP_NODELAY: 1265 case TCP_NOOPT: 1266 switch (sopt->sopt_name) { 1267 case TCP_NODELAY: 1268 opt = TF_NODELAY; 1269 break; 1270 case TCP_NOOPT: 1271 opt = TF_NOOPT; 1272 break; 1273 default: 1274 opt = 0; /* dead code to fool gcc */ 1275 break; 1276 } 1277 1278 if (optval) 1279 tp->t_flags |= opt; 1280 else 1281 tp->t_flags &= ~opt; 1282 break; 1283 1284 case TCP_NOPUSH: 1285 if (optval) 1286 tp->t_flags |= TF_NOPUSH; 1287 else { 1288 tp->t_flags &= ~TF_NOPUSH; 1289 error = tcp_output(tp); 1290 } 1291 break; 1292 1293 case TCP_MAXSEG: 1294 /* 1295 * Must be between 0 and maxseg. If the requested 1296 * maxseg is too small to satisfy the desired minmss, 1297 * pump it up (silently so sysctl modifications of 1298 * minmss do not create unexpected program failures). 1299 * Handle degenerate cases. 1300 */ 1301 if (optval > 0 && optval <= tp->t_maxseg) { 1302 if (optval + 40 < tcp_minmss) { 1303 optval = tcp_minmss - 40; 1304 if (optval < 0) 1305 optval = 1; 1306 } 1307 tp->t_maxseg = optval; 1308 } else { 1309 error = EINVAL; 1310 } 1311 break; 1312 1313 default: 1314 error = ENOPROTOOPT; 1315 break; 1316 } 1317 break; 1318 1319 case SOPT_GET: 1320 switch (sopt->sopt_name) { 1321 #ifdef TCP_SIGNATURE 1322 case TCP_SIGNATURE_ENABLE: 1323 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; 1324 break; 1325 #endif /* TCP_SIGNATURE */ 1326 case TCP_NODELAY: 1327 optval = tp->t_flags & TF_NODELAY; 1328 break; 1329 case TCP_MAXSEG: 1330 optval = tp->t_maxseg; 1331 break; 1332 case TCP_NOOPT: 1333 optval = tp->t_flags & TF_NOOPT; 1334 break; 1335 case TCP_NOPUSH: 1336 optval = tp->t_flags & TF_NOPUSH; 1337 break; 1338 default: 1339 error = ENOPROTOOPT; 1340 break; 1341 } 1342 if (error == 0) 1343 soopt_from_kbuf(sopt, &optval, sizeof optval); 1344 break; 1345 } 1346 return (error); 1347 } 1348 1349 /* 1350 * tcp_sendspace and tcp_recvspace are the default send and receive window 1351 * sizes, respectively. These are obsolescent (this information should 1352 * be set by the route). 1353 * 1354 * Use a default that does not require tcp window scaling to be turned 1355 * on. Individual programs or the administrator can increase the default. 1356 */ 1357 u_long tcp_sendspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ 1358 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, 1359 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); 1360 u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ 1361 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 1362 &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); 1363 1364 /* 1365 * Attach TCP protocol to socket, allocating internet protocol control 1366 * block, tcp control block, bufer space, and entering LISTEN state 1367 * if to accept connections. 1368 */ 1369 static int 1370 tcp_attach(struct socket *so, struct pru_attach_info *ai) 1371 { 1372 struct tcpcb *tp; 1373 struct inpcb *inp; 1374 int error; 1375 int cpu; 1376 #ifdef INET6 1377 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0; 1378 #endif 1379 1380 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) { 1381 lwkt_gettoken(&so->so_rcv.ssb_token); 1382 error = soreserve(so, tcp_sendspace, tcp_recvspace, 1383 ai->sb_rlimit); 1384 lwkt_reltoken(&so->so_rcv.ssb_token); 1385 if (error) 1386 return (error); 1387 } 1388 atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE); 1389 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE); 1390 cpu = mycpu->gd_cpuid; 1391 1392 /* 1393 * Set the default port for protocol processing. This will likely 1394 * change when we connect. 1395 */ 1396 error = in_pcballoc(so, &tcbinfo[cpu]); 1397 if (error) 1398 return (error); 1399 inp = so->so_pcb; 1400 #ifdef INET6 1401 if (isipv6) { 1402 inp->inp_vflag |= INP_IPV6; 1403 inp->in6p_hops = -1; /* use kernel default */ 1404 } 1405 else 1406 #endif 1407 inp->inp_vflag |= INP_IPV4; 1408 tp = tcp_newtcpcb(inp); 1409 if (tp == NULL) { 1410 /* 1411 * Make sure the socket is destroyed by the pcbdetach. 1412 */ 1413 soreference(so); 1414 #ifdef INET6 1415 if (isipv6) 1416 in6_pcbdetach(inp); 1417 else 1418 #endif 1419 in_pcbdetach(inp); 1420 sofree(so); /* from ref above */ 1421 return (ENOBUFS); 1422 } 1423 tp->t_state = TCPS_CLOSED; 1424 return (0); 1425 } 1426 1427 /* 1428 * Initiate (or continue) disconnect. 1429 * If embryonic state, just send reset (once). 1430 * If in ``let data drain'' option and linger null, just drop. 1431 * Otherwise (hard), mark socket disconnecting and drop 1432 * current input data; switch states based on user close, and 1433 * send segment to peer (with FIN). 1434 */ 1435 static struct tcpcb * 1436 tcp_disconnect(struct tcpcb *tp) 1437 { 1438 struct socket *so = tp->t_inpcb->inp_socket; 1439 1440 if (tp->t_state < TCPS_ESTABLISHED) { 1441 tp = tcp_close(tp); 1442 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1443 tp = tcp_drop(tp, 0); 1444 } else { 1445 lwkt_gettoken(&so->so_rcv.ssb_token); 1446 soisdisconnecting(so); 1447 sbflush(&so->so_rcv.sb); 1448 tp = tcp_usrclosed(tp); 1449 if (tp) 1450 tcp_output(tp); 1451 lwkt_reltoken(&so->so_rcv.ssb_token); 1452 } 1453 return (tp); 1454 } 1455 1456 /* 1457 * User issued close, and wish to trail through shutdown states: 1458 * if never received SYN, just forget it. If got a SYN from peer, 1459 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1460 * If already got a FIN from peer, then almost done; go to LAST_ACK 1461 * state. In all other cases, have already sent FIN to peer (e.g. 1462 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1463 * for peer to send FIN or not respond to keep-alives, etc. 1464 * We can let the user exit from the close as soon as the FIN is acked. 1465 */ 1466 static struct tcpcb * 1467 tcp_usrclosed(struct tcpcb *tp) 1468 { 1469 1470 switch (tp->t_state) { 1471 1472 case TCPS_CLOSED: 1473 case TCPS_LISTEN: 1474 tp->t_state = TCPS_CLOSED; 1475 tp = tcp_close(tp); 1476 break; 1477 1478 case TCPS_SYN_SENT: 1479 case TCPS_SYN_RECEIVED: 1480 tp->t_flags |= TF_NEEDFIN; 1481 break; 1482 1483 case TCPS_ESTABLISHED: 1484 tp->t_state = TCPS_FIN_WAIT_1; 1485 break; 1486 1487 case TCPS_CLOSE_WAIT: 1488 tp->t_state = TCPS_LAST_ACK; 1489 break; 1490 } 1491 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) { 1492 soisdisconnected(tp->t_inpcb->inp_socket); 1493 /* To prevent the connection hanging in FIN_WAIT_2 forever. */ 1494 if (tp->t_state == TCPS_FIN_WAIT_2) { 1495 tcp_callout_reset(tp, tp->tt_2msl, tcp_maxidle, 1496 tcp_timer_2msl); 1497 } 1498 } 1499 return (tp); 1500 } 1501