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. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94 63 * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.17 2002/10/11 11:46:44 ume Exp $ 64 */ 65 66 #include "opt_ipsec.h" 67 #include "opt_inet.h" 68 #include "opt_inet6.h" 69 #include "opt_tcpdebug.h" 70 71 #include <sys/param.h> 72 #include <sys/systm.h> 73 #include <sys/kernel.h> 74 #include <sys/malloc.h> 75 #include <sys/sysctl.h> 76 #include <sys/globaldata.h> 77 #include <sys/thread.h> 78 79 #include <sys/mbuf.h> 80 #ifdef INET6 81 #include <sys/domain.h> 82 #endif /* INET6 */ 83 #include <sys/socket.h> 84 #include <sys/socketvar.h> 85 #include <sys/socketops.h> 86 #include <sys/protosw.h> 87 88 #include <sys/thread2.h> 89 #include <sys/msgport2.h> 90 #include <sys/socketvar2.h> 91 92 #include <net/if.h> 93 #include <net/netisr.h> 94 #include <net/route.h> 95 96 #include <net/netmsg2.h> 97 #include <net/netisr2.h> 98 99 #include <netinet/in.h> 100 #include <netinet/in_systm.h> 101 #ifdef INET6 102 #include <netinet/ip6.h> 103 #endif 104 #include <netinet/in_pcb.h> 105 #ifdef INET6 106 #include <netinet6/in6_pcb.h> 107 #endif 108 #include <netinet/in_var.h> 109 #include <netinet/ip_var.h> 110 #ifdef INET6 111 #include <netinet6/ip6_var.h> 112 #include <netinet6/tcp6_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_timer2.h> 119 #include <netinet/tcp_var.h> 120 #include <netinet/tcpip.h> 121 #ifdef TCPDEBUG 122 #include <netinet/tcp_debug.h> 123 #endif 124 125 #ifdef IPSEC 126 #include <netinet6/ipsec.h> 127 #endif /*IPSEC*/ 128 129 /* 130 * TCP protocol interface to socket abstraction. 131 */ 132 extern char *tcpstates[]; /* XXX ??? */ 133 134 static int tcp_attach (struct socket *, struct pru_attach_info *); 135 static void tcp_connect (netmsg_t msg); 136 #ifdef INET6 137 static void tcp6_connect (netmsg_t msg); 138 static int tcp6_connect_oncpu(struct tcpcb *tp, int flags, 139 struct mbuf **mp, 140 struct sockaddr_in6 *sin6, 141 struct in6_addr *addr6); 142 #endif /* INET6 */ 143 static struct tcpcb * 144 tcp_disconnect (struct tcpcb *); 145 static struct tcpcb * 146 tcp_usrclosed (struct tcpcb *); 147 148 #ifdef TCPDEBUG 149 #define TCPDEBUG0 int ostate = 0 150 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 151 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 152 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 153 #else 154 #define TCPDEBUG0 155 #define TCPDEBUG1() 156 #define TCPDEBUG2(req) 157 #endif 158 159 static int tcp_lport_extension = 1; 160 SYSCTL_INT(_net_inet_tcp, OID_AUTO, lportext, CTLFLAG_RW, 161 &tcp_lport_extension, 0, ""); 162 163 /* 164 * For some ill optimized programs, which try to use TCP_NOPUSH 165 * to improve performance, will have small amount of data sits 166 * in the sending buffer. These small amount of data will _not_ 167 * be pushed into the network until more data are written into 168 * the socket or the socket write side is shutdown. 169 */ 170 static int tcp_disable_nopush = 1; 171 SYSCTL_INT(_net_inet_tcp, OID_AUTO, disable_nopush, CTLFLAG_RW, 172 &tcp_disable_nopush, 0, "TCP_NOPUSH socket option will have no effect"); 173 174 /* 175 * TCP attaches to socket via pru_attach(), reserving space, 176 * and an internet control block. This is likely occuring on 177 * cpu0 and may have to move later when we bind/connect. 178 */ 179 static void 180 tcp_usr_attach(netmsg_t msg) 181 { 182 struct socket *so = msg->base.nm_so; 183 struct pru_attach_info *ai = msg->attach.nm_ai; 184 int error; 185 struct inpcb *inp; 186 struct tcpcb *tp = NULL; 187 TCPDEBUG0; 188 189 soreference(so); 190 inp = so->so_pcb; 191 TCPDEBUG1(); 192 if (inp) { 193 error = EISCONN; 194 goto out; 195 } 196 197 error = tcp_attach(so, ai); 198 if (error) 199 goto out; 200 201 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 202 so->so_linger = TCP_LINGERTIME; 203 tp = sototcpcb(so); 204 out: 205 sofree(so); /* from ref above */ 206 TCPDEBUG2(PRU_ATTACH); 207 lwkt_replymsg(&msg->lmsg, error); 208 } 209 210 /* 211 * pru_detach() detaches the TCP protocol from the socket. 212 * If the protocol state is non-embryonic, then can't 213 * do this directly: have to initiate a pru_disconnect(), 214 * which may finish later; embryonic TCB's can just 215 * be discarded here. 216 */ 217 static void 218 tcp_usr_detach(netmsg_t msg) 219 { 220 struct socket *so = msg->base.nm_so; 221 int error = 0; 222 struct inpcb *inp; 223 struct tcpcb *tp; 224 TCPDEBUG0; 225 226 inp = so->so_pcb; 227 228 /* 229 * If the inp is already detached it may have been due to an async 230 * close. Just return as if no error occured. 231 * 232 * It's possible for the tcpcb (tp) to disconnect from the inp due 233 * to tcp_drop()->tcp_close() being called. This may occur *after* 234 * the detach message has been queued so we may find a NULL tp here. 235 */ 236 if (inp) { 237 if ((tp = intotcpcb(inp)) != NULL) { 238 TCPDEBUG1(); 239 tp = tcp_disconnect(tp); 240 TCPDEBUG2(PRU_DETACH); 241 } 242 } 243 lwkt_replymsg(&msg->lmsg, error); 244 } 245 246 /* 247 * NOTE: ignore_error is non-zero for certain disconnection races 248 * which we want to silently allow, otherwise close() may return 249 * an unexpected error. 250 * 251 * NOTE: The variables (msg) and (tp) are assumed. 252 */ 253 #define COMMON_START(so, inp, ignore_error) \ 254 TCPDEBUG0; \ 255 \ 256 inp = so->so_pcb; \ 257 do { \ 258 if (inp == NULL) { \ 259 error = ignore_error ? 0 : EINVAL; \ 260 tp = NULL; \ 261 goto out; \ 262 } \ 263 tp = intotcpcb(inp); \ 264 TCPDEBUG1(); \ 265 } while(0) 266 267 #define COMMON_END1(req, noreply) \ 268 out: do { \ 269 TCPDEBUG2(req); \ 270 if (!(noreply)) \ 271 lwkt_replymsg(&msg->lmsg, error); \ 272 return; \ 273 } while(0) 274 275 #define COMMON_END(req) COMMON_END1((req), 0) 276 277 /* 278 * Give the socket an address. 279 */ 280 static void 281 tcp_usr_bind(netmsg_t msg) 282 { 283 struct socket *so = msg->bind.base.nm_so; 284 struct sockaddr *nam = msg->bind.nm_nam; 285 struct thread *td = msg->bind.nm_td; 286 int error = 0; 287 struct inpcb *inp; 288 struct tcpcb *tp; 289 struct sockaddr_in *sinp; 290 291 COMMON_START(so, inp, 0); 292 293 /* 294 * Must check for multicast addresses and disallow binding 295 * to them. 296 */ 297 sinp = (struct sockaddr_in *)nam; 298 if (sinp->sin_family == AF_INET && 299 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 300 error = EAFNOSUPPORT; 301 goto out; 302 } 303 error = in_pcbbind(inp, nam, td); 304 if (error) 305 goto out; 306 COMMON_END(PRU_BIND); 307 308 } 309 310 #ifdef INET6 311 312 static void 313 tcp6_usr_bind(netmsg_t msg) 314 { 315 struct socket *so = msg->bind.base.nm_so; 316 struct sockaddr *nam = msg->bind.nm_nam; 317 struct thread *td = msg->bind.nm_td; 318 int error = 0; 319 struct inpcb *inp; 320 struct tcpcb *tp; 321 struct sockaddr_in6 *sin6p; 322 323 COMMON_START(so, inp, 0); 324 325 /* 326 * Must check for multicast addresses and disallow binding 327 * to them. 328 */ 329 sin6p = (struct sockaddr_in6 *)nam; 330 if (sin6p->sin6_family == AF_INET6 && 331 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 332 error = EAFNOSUPPORT; 333 goto out; 334 } 335 error = in6_pcbbind(inp, nam, td); 336 if (error) 337 goto out; 338 COMMON_END(PRU_BIND); 339 } 340 #endif /* INET6 */ 341 342 struct netmsg_inswildcard { 343 struct netmsg_base base; 344 struct inpcb *nm_inp; 345 }; 346 347 static void 348 in_pcbinswildcardhash_handler(netmsg_t msg) 349 { 350 struct netmsg_inswildcard *nm = (struct netmsg_inswildcard *)msg; 351 int cpu = mycpuid, nextcpu; 352 353 in_pcbinswildcardhash_oncpu(nm->nm_inp, &tcbinfo[cpu]); 354 355 nextcpu = cpu + 1; 356 if (nextcpu < ncpus2) 357 lwkt_forwardmsg(netisr_cpuport(nextcpu), &nm->base.lmsg); 358 else 359 lwkt_replymsg(&nm->base.lmsg, 0); 360 } 361 362 static void 363 tcp_sosetport(struct lwkt_msg *msg, lwkt_port_t port) 364 { 365 sosetport(((struct netmsg_base *)msg)->nm_so, port); 366 } 367 368 /* 369 * Prepare to accept connections. 370 */ 371 static void 372 tcp_usr_listen(netmsg_t msg) 373 { 374 struct socket *so = msg->listen.base.nm_so; 375 struct thread *td = msg->listen.nm_td; 376 int error = 0; 377 struct inpcb *inp; 378 struct tcpcb *tp; 379 struct netmsg_inswildcard nm; 380 lwkt_port_t port0 = netisr_cpuport(0); 381 382 COMMON_START(so, inp, 0); 383 384 if (&curthread->td_msgport != port0) { 385 lwkt_msg_t lmsg = &msg->listen.base.lmsg; 386 387 KASSERT((msg->listen.nm_flags & PRUL_RELINK) == 0, 388 ("already asked to relink")); 389 390 in_pcbunlink(so->so_pcb, &tcbinfo[mycpuid]); 391 msg->listen.nm_flags |= PRUL_RELINK; 392 393 /* See the related comment in tcp_connect() */ 394 lwkt_setmsg_receipt(lmsg, tcp_sosetport); 395 lwkt_forwardmsg(port0, lmsg); 396 /* msg invalid now */ 397 return; 398 } 399 KASSERT(so->so_port == port0, ("so_port is not netisr0")); 400 401 if (msg->listen.nm_flags & PRUL_RELINK) { 402 msg->listen.nm_flags &= ~PRUL_RELINK; 403 in_pcblink(so->so_pcb, &tcbinfo[mycpuid]); 404 } 405 KASSERT(inp->inp_pcbinfo == &tcbinfo[0], ("pcbinfo is not tcbinfo0")); 406 407 if (tp->t_flags & TF_LISTEN) 408 goto out; 409 410 if (inp->inp_lport == 0) { 411 error = in_pcbbind(inp, NULL, td); 412 if (error) 413 goto out; 414 } 415 416 tp->t_state = TCPS_LISTEN; 417 tp->t_flags |= TF_LISTEN; 418 tp->tt_msg = NULL; /* Catch any invalid timer usage */ 419 420 if (ncpus2 > 1) { 421 /* 422 * Put this inpcb into wildcard hash on other cpus. 423 */ 424 ASSERT_INP_NOTINHASH(inp); 425 netmsg_init(&nm.base, NULL, &curthread->td_msgport, 426 MSGF_PRIORITY, in_pcbinswildcardhash_handler); 427 nm.nm_inp = inp; 428 lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0); 429 } 430 in_pcbinswildcardhash(inp); 431 COMMON_END(PRU_LISTEN); 432 } 433 434 #ifdef INET6 435 436 static void 437 tcp6_usr_listen(netmsg_t msg) 438 { 439 struct socket *so = msg->listen.base.nm_so; 440 struct thread *td = msg->listen.nm_td; 441 int error = 0; 442 struct inpcb *inp; 443 struct tcpcb *tp; 444 struct netmsg_inswildcard nm; 445 446 COMMON_START(so, inp, 0); 447 448 if (tp->t_flags & TF_LISTEN) 449 goto out; 450 451 if (inp->inp_lport == 0) { 452 error = in6_pcbbind(inp, NULL, td); 453 if (error) 454 goto out; 455 } 456 457 tp->t_state = TCPS_LISTEN; 458 tp->t_flags |= TF_LISTEN; 459 tp->tt_msg = NULL; /* Catch any invalid timer usage */ 460 461 if (ncpus2 > 1) { 462 /* 463 * Put this inpcb into wildcard hash on other cpus. 464 */ 465 KKASSERT(so->so_port == netisr_cpuport(0)); 466 ASSERT_IN_NETISR(0); 467 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]); 468 ASSERT_INP_NOTINHASH(inp); 469 470 netmsg_init(&nm.base, NULL, &curthread->td_msgport, 471 MSGF_PRIORITY, in_pcbinswildcardhash_handler); 472 nm.nm_inp = inp; 473 lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0); 474 } 475 in_pcbinswildcardhash(inp); 476 COMMON_END(PRU_LISTEN); 477 } 478 #endif /* INET6 */ 479 480 /* 481 * Initiate connection to peer. 482 * Create a template for use in transmissions on this connection. 483 * Enter SYN_SENT state, and mark socket as connecting. 484 * Start keep-alive timer, and seed output sequence space. 485 * Send initial segment on connection. 486 */ 487 static void 488 tcp_usr_connect(netmsg_t msg) 489 { 490 struct socket *so = msg->connect.base.nm_so; 491 struct sockaddr *nam = msg->connect.nm_nam; 492 struct thread *td = msg->connect.nm_td; 493 int error = 0; 494 struct inpcb *inp; 495 struct tcpcb *tp; 496 struct sockaddr_in *sinp; 497 498 COMMON_START(so, inp, 0); 499 500 /* 501 * Must disallow TCP ``connections'' to multicast addresses. 502 */ 503 sinp = (struct sockaddr_in *)nam; 504 if (sinp->sin_family == AF_INET 505 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 506 error = EAFNOSUPPORT; 507 goto out; 508 } 509 510 if (!prison_remote_ip(td, (struct sockaddr*)sinp)) { 511 error = EAFNOSUPPORT; /* IPv6 only jail */ 512 goto out; 513 } 514 515 tcp_connect(msg); 516 /* msg is invalid now */ 517 return; 518 out: 519 if (msg->connect.nm_m) { 520 m_freem(msg->connect.nm_m); 521 msg->connect.nm_m = NULL; 522 } 523 if (msg->connect.nm_flags & PRUC_HELDTD) 524 lwkt_rele(td); 525 if (error && (msg->connect.nm_flags & PRUC_ASYNC)) { 526 so->so_error = error; 527 soisdisconnected(so); 528 } 529 lwkt_replymsg(&msg->lmsg, error); 530 } 531 532 #ifdef INET6 533 534 static void 535 tcp6_usr_connect(netmsg_t msg) 536 { 537 struct socket *so = msg->connect.base.nm_so; 538 struct sockaddr *nam = msg->connect.nm_nam; 539 struct thread *td = msg->connect.nm_td; 540 int error = 0; 541 struct inpcb *inp; 542 struct tcpcb *tp; 543 struct sockaddr_in6 *sin6p; 544 545 COMMON_START(so, inp, 0); 546 547 /* 548 * Must disallow TCP ``connections'' to multicast addresses. 549 */ 550 sin6p = (struct sockaddr_in6 *)nam; 551 if (sin6p->sin6_family == AF_INET6 552 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 553 error = EAFNOSUPPORT; 554 goto out; 555 } 556 557 if (!prison_remote_ip(td, nam)) { 558 error = EAFNOSUPPORT; /* IPv4 only jail */ 559 goto out; 560 } 561 562 /* Reject v4-mapped address */ 563 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 564 error = EADDRNOTAVAIL; 565 goto out; 566 } 567 568 inp->inp_inc.inc_isipv6 = 1; 569 tcp6_connect(msg); 570 /* msg is invalid now */ 571 return; 572 out: 573 if (msg->connect.nm_m) { 574 m_freem(msg->connect.nm_m); 575 msg->connect.nm_m = NULL; 576 } 577 lwkt_replymsg(&msg->lmsg, error); 578 } 579 580 #endif /* INET6 */ 581 582 /* 583 * Initiate disconnect from peer. 584 * If connection never passed embryonic stage, just drop; 585 * else if don't need to let data drain, then can just drop anyways, 586 * else have to begin TCP shutdown process: mark socket disconnecting, 587 * drain unread data, state switch to reflect user close, and 588 * send segment (e.g. FIN) to peer. Socket will be really disconnected 589 * when peer sends FIN and acks ours. 590 * 591 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 592 */ 593 static void 594 tcp_usr_disconnect(netmsg_t msg) 595 { 596 struct socket *so = msg->disconnect.base.nm_so; 597 int error = 0; 598 struct inpcb *inp; 599 struct tcpcb *tp; 600 601 COMMON_START(so, inp, 1); 602 tp = tcp_disconnect(tp); 603 COMMON_END(PRU_DISCONNECT); 604 } 605 606 /* 607 * Accept a connection. Essentially all the work is 608 * done at higher levels; just return the address 609 * of the peer, storing through addr. 610 */ 611 static void 612 tcp_usr_accept(netmsg_t msg) 613 { 614 struct socket *so = msg->accept.base.nm_so; 615 struct sockaddr **nam = msg->accept.nm_nam; 616 int error = 0; 617 struct inpcb *inp; 618 struct tcpcb *tp = NULL; 619 TCPDEBUG0; 620 621 inp = so->so_pcb; 622 if (so->so_state & SS_ISDISCONNECTED) { 623 error = ECONNABORTED; 624 goto out; 625 } 626 if (inp == 0) { 627 error = EINVAL; 628 goto out; 629 } 630 631 tp = intotcpcb(inp); 632 TCPDEBUG1(); 633 in_setpeeraddr(so, nam); 634 COMMON_END(PRU_ACCEPT); 635 } 636 637 #ifdef INET6 638 static void 639 tcp6_usr_accept(netmsg_t msg) 640 { 641 struct socket *so = msg->accept.base.nm_so; 642 struct sockaddr **nam = msg->accept.nm_nam; 643 int error = 0; 644 struct inpcb *inp; 645 struct tcpcb *tp = NULL; 646 TCPDEBUG0; 647 648 inp = so->so_pcb; 649 650 if (so->so_state & SS_ISDISCONNECTED) { 651 error = ECONNABORTED; 652 goto out; 653 } 654 if (inp == 0) { 655 error = EINVAL; 656 goto out; 657 } 658 tp = intotcpcb(inp); 659 TCPDEBUG1(); 660 in6_setpeeraddr(so, nam); 661 COMMON_END(PRU_ACCEPT); 662 } 663 #endif /* INET6 */ 664 /* 665 * Mark the connection as being incapable of further output. 666 */ 667 static void 668 tcp_usr_shutdown(netmsg_t msg) 669 { 670 struct socket *so = msg->shutdown.base.nm_so; 671 int error = 0; 672 struct inpcb *inp; 673 struct tcpcb *tp; 674 675 COMMON_START(so, inp, 0); 676 socantsendmore(so); 677 tp = tcp_usrclosed(tp); 678 if (tp) 679 error = tcp_output(tp); 680 COMMON_END(PRU_SHUTDOWN); 681 } 682 683 /* 684 * After a receive, possibly send window update to peer. 685 */ 686 static void 687 tcp_usr_rcvd(netmsg_t msg) 688 { 689 struct socket *so = msg->rcvd.base.nm_so; 690 int error = 0, noreply = 0; 691 struct inpcb *inp; 692 struct tcpcb *tp; 693 694 COMMON_START(so, inp, 0); 695 696 if (msg->rcvd.nm_pru_flags & PRUR_ASYNC) { 697 noreply = 1; 698 so_async_rcvd_reply(so); 699 } 700 tcp_output(tp); 701 702 COMMON_END1(PRU_RCVD, noreply); 703 } 704 705 /* 706 * Do a send by putting data in output queue and updating urgent 707 * marker if URG set. Possibly send more data. Unlike the other 708 * pru_*() routines, the mbuf chains are our responsibility. We 709 * must either enqueue them or free them. The other pru_* routines 710 * generally are caller-frees. 711 */ 712 static void 713 tcp_usr_send(netmsg_t msg) 714 { 715 struct socket *so = msg->send.base.nm_so; 716 int flags = msg->send.nm_flags; 717 struct mbuf *m = msg->send.nm_m; 718 int error = 0; 719 struct inpcb *inp; 720 struct tcpcb *tp; 721 TCPDEBUG0; 722 723 KKASSERT(msg->send.nm_control == NULL); 724 KKASSERT(msg->send.nm_addr == NULL); 725 KKASSERT((flags & PRUS_FREEADDR) == 0); 726 727 inp = so->so_pcb; 728 729 if (inp == NULL) { 730 /* 731 * OOPS! we lost a race, the TCP session got reset after 732 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a 733 * network interrupt in the non-critical section of sosend(). 734 */ 735 m_freem(m); 736 error = ECONNRESET; /* XXX EPIPE? */ 737 tp = NULL; 738 TCPDEBUG1(); 739 goto out; 740 } 741 tp = intotcpcb(inp); 742 TCPDEBUG1(); 743 744 #ifdef foo 745 /* 746 * This is no longer necessary, since: 747 * - sosendtcp() has already checked it for us 748 * - It does not work with asynchronized send 749 */ 750 751 /* 752 * Don't let too much OOB data build up 753 */ 754 if (flags & PRUS_OOB) { 755 if (ssb_space(&so->so_snd) < -512) { 756 m_freem(m); 757 error = ENOBUFS; 758 goto out; 759 } 760 } 761 #endif 762 763 /* 764 * Pump the data into the socket. 765 */ 766 if (m) { 767 ssb_appendstream(&so->so_snd, m); 768 sowwakeup(so); 769 } 770 if (flags & PRUS_OOB) { 771 /* 772 * According to RFC961 (Assigned Protocols), 773 * the urgent pointer points to the last octet 774 * of urgent data. We continue, however, 775 * to consider it to indicate the first octet 776 * of data past the urgent section. 777 * Otherwise, snd_up should be one lower. 778 */ 779 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 780 tp->t_flags |= TF_FORCE; 781 error = tcp_output(tp); 782 tp->t_flags &= ~TF_FORCE; 783 } else { 784 if (flags & PRUS_EOF) { 785 /* 786 * Close the send side of the connection after 787 * the data is sent. 788 */ 789 socantsendmore(so); 790 tp = tcp_usrclosed(tp); 791 } 792 if (tp != NULL && !tcp_output_pending(tp)) { 793 if (flags & PRUS_MORETOCOME) 794 tp->t_flags |= TF_MORETOCOME; 795 error = tcp_output_fair(tp); 796 if (flags & PRUS_MORETOCOME) 797 tp->t_flags &= ~TF_MORETOCOME; 798 } 799 } 800 COMMON_END1((flags & PRUS_OOB) ? PRU_SENDOOB : 801 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND), 802 (flags & PRUS_NOREPLY)); 803 } 804 805 /* 806 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort() 807 * will sofree() it when we return. 808 */ 809 static void 810 tcp_usr_abort(netmsg_t msg) 811 { 812 struct socket *so = msg->abort.base.nm_so; 813 int error = 0; 814 struct inpcb *inp; 815 struct tcpcb *tp; 816 817 COMMON_START(so, inp, 1); 818 tp = tcp_drop(tp, ECONNABORTED); 819 COMMON_END(PRU_ABORT); 820 } 821 822 /* 823 * Receive out-of-band data. 824 */ 825 static void 826 tcp_usr_rcvoob(netmsg_t msg) 827 { 828 struct socket *so = msg->rcvoob.base.nm_so; 829 struct mbuf *m = msg->rcvoob.nm_m; 830 int flags = msg->rcvoob.nm_flags; 831 int error = 0; 832 struct inpcb *inp; 833 struct tcpcb *tp; 834 835 COMMON_START(so, inp, 0); 836 if ((so->so_oobmark == 0 && 837 (so->so_state & SS_RCVATMARK) == 0) || 838 so->so_options & SO_OOBINLINE || 839 tp->t_oobflags & TCPOOB_HADDATA) { 840 error = EINVAL; 841 goto out; 842 } 843 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 844 error = EWOULDBLOCK; 845 goto out; 846 } 847 m->m_len = 1; 848 *mtod(m, caddr_t) = tp->t_iobc; 849 if ((flags & MSG_PEEK) == 0) 850 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 851 COMMON_END(PRU_RCVOOB); 852 } 853 854 static void 855 tcp_usr_savefaddr(struct socket *so, const struct sockaddr *faddr) 856 { 857 in_savefaddr(so, faddr); 858 } 859 860 #ifdef INET6 861 static void 862 tcp6_usr_savefaddr(struct socket *so, const struct sockaddr *faddr) 863 { 864 in6_savefaddr(so, faddr); 865 } 866 #endif 867 868 static int 869 tcp_usr_preconnect(struct socket *so, const struct sockaddr *nam, 870 struct thread *td __unused) 871 { 872 const struct sockaddr_in *sinp; 873 874 sinp = (const struct sockaddr_in *)nam; 875 if (sinp->sin_family == AF_INET && 876 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 877 return EAFNOSUPPORT; 878 879 soisconnecting(so); 880 return 0; 881 } 882 883 /* xxx - should be const */ 884 struct pr_usrreqs tcp_usrreqs = { 885 .pru_abort = tcp_usr_abort, 886 .pru_accept = tcp_usr_accept, 887 .pru_attach = tcp_usr_attach, 888 .pru_bind = tcp_usr_bind, 889 .pru_connect = tcp_usr_connect, 890 .pru_connect2 = pr_generic_notsupp, 891 .pru_control = in_control_dispatch, 892 .pru_detach = tcp_usr_detach, 893 .pru_disconnect = tcp_usr_disconnect, 894 .pru_listen = tcp_usr_listen, 895 .pru_peeraddr = in_setpeeraddr_dispatch, 896 .pru_rcvd = tcp_usr_rcvd, 897 .pru_rcvoob = tcp_usr_rcvoob, 898 .pru_send = tcp_usr_send, 899 .pru_sense = pru_sense_null, 900 .pru_shutdown = tcp_usr_shutdown, 901 .pru_sockaddr = in_setsockaddr_dispatch, 902 .pru_sosend = sosendtcp, 903 .pru_soreceive = sorecvtcp, 904 .pru_savefaddr = tcp_usr_savefaddr, 905 .pru_preconnect = tcp_usr_preconnect 906 }; 907 908 #ifdef INET6 909 struct pr_usrreqs tcp6_usrreqs = { 910 .pru_abort = tcp_usr_abort, 911 .pru_accept = tcp6_usr_accept, 912 .pru_attach = tcp_usr_attach, 913 .pru_bind = tcp6_usr_bind, 914 .pru_connect = tcp6_usr_connect, 915 .pru_connect2 = pr_generic_notsupp, 916 .pru_control = in6_control_dispatch, 917 .pru_detach = tcp_usr_detach, 918 .pru_disconnect = tcp_usr_disconnect, 919 .pru_listen = tcp6_usr_listen, 920 .pru_peeraddr = in6_setpeeraddr_dispatch, 921 .pru_rcvd = tcp_usr_rcvd, 922 .pru_rcvoob = tcp_usr_rcvoob, 923 .pru_send = tcp_usr_send, 924 .pru_sense = pru_sense_null, 925 .pru_shutdown = tcp_usr_shutdown, 926 .pru_sockaddr = in6_setsockaddr_dispatch, 927 .pru_sosend = sosendtcp, 928 .pru_soreceive = sorecvtcp, 929 .pru_savefaddr = tcp6_usr_savefaddr 930 }; 931 #endif /* INET6 */ 932 933 static int 934 tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m, 935 struct sockaddr_in *sin, struct sockaddr_in *if_sin) 936 { 937 struct inpcb *inp = tp->t_inpcb, *oinp; 938 struct socket *so = inp->inp_socket; 939 struct route *ro = &inp->inp_route; 940 941 KASSERT(inp->inp_pcbinfo == &tcbinfo[mycpu->gd_cpuid], 942 ("pcbinfo mismatch")); 943 944 oinp = in_pcblookup_hash(inp->inp_pcbinfo, 945 sin->sin_addr, sin->sin_port, 946 (inp->inp_laddr.s_addr != INADDR_ANY ? 947 inp->inp_laddr : if_sin->sin_addr), 948 inp->inp_lport, 0, NULL); 949 if (oinp != NULL) { 950 m_freem(m); 951 return (EADDRINUSE); 952 } 953 if (inp->inp_laddr.s_addr == INADDR_ANY) 954 inp->inp_laddr = if_sin->sin_addr; 955 inp->inp_faddr = sin->sin_addr; 956 inp->inp_fport = sin->sin_port; 957 in_pcbinsconnhash(inp); 958 959 /* 960 * We are now on the inpcb's owner CPU, if the cached route was 961 * freed because the rtentry's owner CPU is not the current CPU 962 * (e.g. in tcp_connect()), then we try to reallocate it here with 963 * the hope that a rtentry may be cloned from a RTF_PRCLONING 964 * rtentry. 965 */ 966 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/ 967 ro->ro_rt == NULL) { 968 bzero(&ro->ro_dst, sizeof(struct sockaddr_in)); 969 ro->ro_dst.sa_family = AF_INET; 970 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 971 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = 972 sin->sin_addr; 973 rtalloc(ro); 974 } 975 976 /* 977 * Now that no more errors can occur, change the protocol processing 978 * port to the current thread (which is the correct thread). 979 * 980 * Create TCP timer message now; we are on the tcpcb's owner 981 * CPU/thread. 982 */ 983 tcp_create_timermsg(tp, &curthread->td_msgport); 984 985 /* 986 * Compute window scaling to request. Use a larger scaling then 987 * needed for the initial receive buffer in case the receive buffer 988 * gets expanded. 989 */ 990 if (tp->request_r_scale < TCP_MIN_WINSHIFT) 991 tp->request_r_scale = TCP_MIN_WINSHIFT; 992 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 993 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat 994 ) { 995 tp->request_r_scale++; 996 } 997 998 soisconnecting(so); 999 tcpstat.tcps_connattempt++; 1000 tp->t_state = TCPS_SYN_SENT; 1001 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep); 1002 tp->iss = tcp_new_isn(tp); 1003 tcp_sendseqinit(tp); 1004 if (m) { 1005 ssb_appendstream(&so->so_snd, m); 1006 m = NULL; 1007 if (flags & PRUS_OOB) 1008 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 1009 } 1010 1011 /* 1012 * Close the send side of the connection after 1013 * the data is sent if flagged. 1014 */ 1015 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) { 1016 socantsendmore(so); 1017 tp = tcp_usrclosed(tp); 1018 } 1019 return (tcp_output(tp)); 1020 } 1021 1022 /* 1023 * Common subroutine to open a TCP connection to remote host specified 1024 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1025 * port number if needed. Call in_pcbladdr to do the routing and to choose 1026 * a local host address (interface). 1027 * Initialize connection parameters and enter SYN-SENT state. 1028 */ 1029 static void 1030 tcp_connect(netmsg_t msg) 1031 { 1032 struct socket *so = msg->connect.base.nm_so; 1033 struct sockaddr *nam = msg->connect.nm_nam; 1034 struct thread *td = msg->connect.nm_td; 1035 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 1036 struct sockaddr_in *if_sin = NULL; 1037 struct inpcb *inp; 1038 struct tcpcb *tp; 1039 int error; 1040 lwkt_port_t port; 1041 1042 COMMON_START(so, inp, 0); 1043 1044 /* 1045 * Reconnect our pcb if we have to 1046 */ 1047 if (msg->connect.nm_flags & PRUC_RECONNECT) { 1048 msg->connect.nm_flags &= ~PRUC_RECONNECT; 1049 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1050 } 1051 1052 /* 1053 * Bind if we have to 1054 */ 1055 if (inp->inp_lport == 0) { 1056 if (tcp_lport_extension) { 1057 KKASSERT(inp->inp_laddr.s_addr == INADDR_ANY); 1058 1059 error = in_pcbladdr(inp, nam, &if_sin, td); 1060 if (error) 1061 goto out; 1062 inp->inp_laddr.s_addr = if_sin->sin_addr.s_addr; 1063 1064 error = in_pcbbind_remote(inp, nam, td); 1065 if (error) 1066 goto out; 1067 1068 msg->connect.nm_flags |= PRUC_HASLADDR; 1069 } else { 1070 error = in_pcbbind(inp, NULL, td); 1071 if (error) 1072 goto out; 1073 } 1074 } 1075 1076 if ((msg->connect.nm_flags & PRUC_HASLADDR) == 0) { 1077 /* 1078 * Calculate the correct protocol processing thread. The 1079 * connect operation must run there. Set the forwarding 1080 * port before we forward the message or it will get bounced 1081 * right back to us. 1082 */ 1083 error = in_pcbladdr(inp, nam, &if_sin, td); 1084 if (error) 1085 goto out; 1086 } 1087 KKASSERT(inp->inp_socket == so); 1088 1089 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port, 1090 (inp->inp_laddr.s_addr != INADDR_ANY ? 1091 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr), 1092 inp->inp_lport); 1093 1094 if (port != &curthread->td_msgport) { 1095 lwkt_msg_t lmsg = &msg->connect.base.lmsg; 1096 1097 /* 1098 * in_pcbladdr() may have allocated a route entry for us 1099 * on the current CPU, but we need a route entry on the 1100 * inpcb's owner CPU, so free it here. 1101 */ 1102 in_pcbresetroute(inp); 1103 1104 /* 1105 * We are moving the protocol processing port the socket 1106 * is on, we have to unlink here and re-link on the 1107 * target cpu. 1108 */ 1109 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1110 msg->connect.nm_flags |= PRUC_RECONNECT; 1111 msg->connect.base.nm_dispatch = tcp_connect; 1112 1113 /* 1114 * Use message put done receipt to change this socket's 1115 * so_port, i.e. _after_ this message was put onto the 1116 * target netisr's msgport but _before_ the message could 1117 * be pulled from the target netisr's msgport, so that: 1118 * - The upper half (socket code) will not see the new 1119 * msgport before this message reaches the new msgport 1120 * and messages for this socket will be ordered. 1121 * - This message will see the new msgport, when its 1122 * handler is called in the target netisr. 1123 * 1124 * NOTE: 1125 * We MUST use messege put done receipt to change this 1126 * socket's so_port: 1127 * If we changed the so_port in this netisr after the 1128 * lwkt_forwardmsg (so messages for this socket will be 1129 * ordered) and changed the so_port in the target netisr 1130 * at the very beginning of this message's handler, we 1131 * would suffer so_port overwritten race, given this 1132 * message might be forwarded again. 1133 * 1134 * NOTE: 1135 * This mechanism depends on that the netisr's msgport 1136 * is spin msgport (currently it is :). 1137 * 1138 * If the upper half saw the new msgport before this 1139 * message reached the target netisr's msgport, the 1140 * messages sent from the upper half could reach the new 1141 * msgport before this message, thus there would be 1142 * message reordering. The worst case could be soclose() 1143 * saw the new msgport and the detach message could reach 1144 * the new msgport before this message, i.e. the inpcb 1145 * could have been destroyed when this message was still 1146 * pending on or on its way to the new msgport. Other 1147 * weird cases could also happen, e.g. inpcb->inp_pcbinfo, 1148 * since we have unlinked this inpcb from the current 1149 * pcbinfo first. 1150 */ 1151 lwkt_setmsg_receipt(lmsg, tcp_sosetport); 1152 lwkt_forwardmsg(port, lmsg); 1153 /* msg invalid now */ 1154 return; 1155 } else if (msg->connect.nm_flags & PRUC_HELDTD) { 1156 /* 1157 * The original thread is no longer needed; release it. 1158 */ 1159 lwkt_rele(td); 1160 msg->connect.nm_flags &= ~PRUC_HELDTD; 1161 } 1162 error = tcp_connect_oncpu(tp, msg->connect.nm_sndflags, 1163 msg->connect.nm_m, sin, if_sin); 1164 msg->connect.nm_m = NULL; 1165 out: 1166 if (msg->connect.nm_m) { 1167 m_freem(msg->connect.nm_m); 1168 msg->connect.nm_m = NULL; 1169 } 1170 if (msg->connect.nm_flags & PRUC_HELDTD) 1171 lwkt_rele(td); 1172 if (error && (msg->connect.nm_flags & PRUC_ASYNC)) { 1173 so->so_error = error; 1174 soisdisconnected(so); 1175 } 1176 lwkt_replymsg(&msg->connect.base.lmsg, error); 1177 /* msg invalid now */ 1178 } 1179 1180 #ifdef INET6 1181 1182 static void 1183 tcp6_connect(netmsg_t msg) 1184 { 1185 struct tcpcb *tp; 1186 struct socket *so = msg->connect.base.nm_so; 1187 struct sockaddr *nam = msg->connect.nm_nam; 1188 struct thread *td = msg->connect.nm_td; 1189 struct inpcb *inp; 1190 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 1191 struct in6_addr *addr6; 1192 lwkt_port_t port; 1193 int error; 1194 1195 COMMON_START(so, inp, 0); 1196 1197 /* 1198 * Reconnect our pcb if we have to 1199 */ 1200 if (msg->connect.nm_flags & PRUC_RECONNECT) { 1201 msg->connect.nm_flags &= ~PRUC_RECONNECT; 1202 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1203 } 1204 1205 /* 1206 * Bind if we have to 1207 */ 1208 if (inp->inp_lport == 0) { 1209 error = in6_pcbbind(inp, NULL, td); 1210 if (error) 1211 goto out; 1212 } 1213 1214 /* 1215 * Cannot simply call in_pcbconnect, because there might be an 1216 * earlier incarnation of this same connection still in 1217 * TIME_WAIT state, creating an ADDRINUSE error. 1218 */ 1219 error = in6_pcbladdr(inp, nam, &addr6, td); 1220 if (error) 1221 goto out; 1222 1223 port = tcp6_addrport(); /* XXX hack for now, always cpu0 */ 1224 1225 if (port != &curthread->td_msgport) { 1226 lwkt_msg_t lmsg = &msg->connect.base.lmsg; 1227 1228 /* 1229 * in_pcbladdr() may have allocated a route entry for us 1230 * on the current CPU, but we need a route entry on the 1231 * inpcb's owner CPU, so free it here. 1232 */ 1233 in_pcbresetroute(inp); 1234 1235 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1236 msg->connect.nm_flags |= PRUC_RECONNECT; 1237 msg->connect.base.nm_dispatch = tcp6_connect; 1238 1239 /* See the related comment in tcp_connect() */ 1240 lwkt_setmsg_receipt(lmsg, tcp_sosetport); 1241 lwkt_forwardmsg(port, lmsg); 1242 /* msg invalid now */ 1243 return; 1244 } 1245 error = tcp6_connect_oncpu(tp, msg->connect.nm_sndflags, 1246 &msg->connect.nm_m, sin6, addr6); 1247 /* nm_m may still be intact */ 1248 out: 1249 if (msg->connect.nm_m) { 1250 m_freem(msg->connect.nm_m); 1251 msg->connect.nm_m = NULL; 1252 } 1253 lwkt_replymsg(&msg->connect.base.lmsg, error); 1254 /* msg invalid now */ 1255 } 1256 1257 static int 1258 tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp, 1259 struct sockaddr_in6 *sin6, struct in6_addr *addr6) 1260 { 1261 struct mbuf *m = *mp; 1262 struct inpcb *inp = tp->t_inpcb; 1263 struct socket *so = inp->inp_socket; 1264 struct inpcb *oinp; 1265 1266 /* 1267 * Cannot simply call in_pcbconnect, because there might be an 1268 * earlier incarnation of this same connection still in 1269 * TIME_WAIT state, creating an ADDRINUSE error. 1270 */ 1271 oinp = in6_pcblookup_hash(inp->inp_pcbinfo, 1272 &sin6->sin6_addr, sin6->sin6_port, 1273 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ? 1274 addr6 : &inp->in6p_laddr), 1275 inp->inp_lport, 0, NULL); 1276 if (oinp) 1277 return (EADDRINUSE); 1278 1279 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1280 inp->in6p_laddr = *addr6; 1281 inp->in6p_faddr = sin6->sin6_addr; 1282 inp->inp_fport = sin6->sin6_port; 1283 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0) 1284 inp->in6p_flowinfo = sin6->sin6_flowinfo; 1285 in_pcbinsconnhash(inp); 1286 1287 /* 1288 * Now that no more errors can occur, change the protocol processing 1289 * port to the current thread (which is the correct thread). 1290 * 1291 * Create TCP timer message now; we are on the tcpcb's owner 1292 * CPU/thread. 1293 */ 1294 tcp_create_timermsg(tp, &curthread->td_msgport); 1295 1296 /* Compute window scaling to request. */ 1297 if (tp->request_r_scale < TCP_MIN_WINSHIFT) 1298 tp->request_r_scale = TCP_MIN_WINSHIFT; 1299 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1300 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) { 1301 tp->request_r_scale++; 1302 } 1303 1304 soisconnecting(so); 1305 tcpstat.tcps_connattempt++; 1306 tp->t_state = TCPS_SYN_SENT; 1307 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep); 1308 tp->iss = tcp_new_isn(tp); 1309 tcp_sendseqinit(tp); 1310 if (m) { 1311 ssb_appendstream(&so->so_snd, m); 1312 *mp = NULL; 1313 if (flags & PRUS_OOB) 1314 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 1315 } 1316 1317 /* 1318 * Close the send side of the connection after 1319 * the data is sent if flagged. 1320 */ 1321 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) { 1322 socantsendmore(so); 1323 tp = tcp_usrclosed(tp); 1324 } 1325 return (tcp_output(tp)); 1326 } 1327 1328 #endif /* INET6 */ 1329 1330 /* 1331 * The new sockopt interface makes it possible for us to block in the 1332 * copyin/out step (if we take a page fault). Taking a page fault while 1333 * in a critical section is probably a Bad Thing. (Since sockets and pcbs 1334 * both now use TSM, there probably isn't any need for this function to 1335 * run in a critical section any more. This needs more examination.) 1336 */ 1337 void 1338 tcp_ctloutput(netmsg_t msg) 1339 { 1340 struct socket *so = msg->base.nm_so; 1341 struct sockopt *sopt = msg->ctloutput.nm_sopt; 1342 int error, opt, optval, opthz; 1343 struct inpcb *inp; 1344 struct tcpcb *tp; 1345 1346 error = 0; 1347 inp = so->so_pcb; 1348 if (inp == NULL) { 1349 error = ECONNRESET; 1350 goto done; 1351 } 1352 tp = intotcpcb(inp); 1353 1354 /* Get socket's owner cpuid hint */ 1355 if (sopt->sopt_level == SOL_SOCKET && 1356 sopt->sopt_dir == SOPT_GET && 1357 sopt->sopt_name == SO_CPUHINT) { 1358 if (tp->t_flags & TF_LISTEN) { 1359 /* 1360 * Listen sockets owner cpuid is always 0, 1361 * which does not make sense if SO_REUSEPORT 1362 * is not set. 1363 */ 1364 if (so->so_options & SO_REUSEPORT) 1365 optval = (inp->inp_lgrpindex & ncpus2_mask); 1366 else 1367 optval = -1; /* no hint */ 1368 } else { 1369 optval = mycpuid; 1370 } 1371 soopt_from_kbuf(sopt, &optval, sizeof(optval)); 1372 goto done; 1373 } 1374 1375 if (sopt->sopt_level != IPPROTO_TCP) { 1376 if (sopt->sopt_level == IPPROTO_IP) { 1377 switch (sopt->sopt_name) { 1378 case IP_MULTICAST_IF: 1379 case IP_MULTICAST_VIF: 1380 case IP_MULTICAST_TTL: 1381 case IP_MULTICAST_LOOP: 1382 case IP_ADD_MEMBERSHIP: 1383 case IP_DROP_MEMBERSHIP: 1384 /* 1385 * Multicast does not make sense on 1386 * TCP sockets. 1387 */ 1388 error = EOPNOTSUPP; 1389 goto done; 1390 } 1391 } 1392 #ifdef INET6 1393 if (INP_CHECK_SOCKAF(so, AF_INET6)) 1394 ip6_ctloutput_dispatch(msg); 1395 else 1396 #endif /* INET6 */ 1397 ip_ctloutput(msg); 1398 /* msg invalid now */ 1399 return; 1400 } 1401 1402 switch (sopt->sopt_dir) { 1403 case SOPT_SET: 1404 error = soopt_to_kbuf(sopt, &optval, sizeof optval, 1405 sizeof optval); 1406 if (error) 1407 break; 1408 switch (sopt->sopt_name) { 1409 case TCP_FASTKEEP: 1410 if (optval > 0) 1411 tp->t_keepidle = tp->t_keepintvl; 1412 else 1413 tp->t_keepidle = tcp_keepidle; 1414 tcp_timer_keep_activity(tp, 0); 1415 break; 1416 #ifdef TCP_SIGNATURE 1417 case TCP_SIGNATURE_ENABLE: 1418 if (tp->t_state == TCPS_CLOSED) { 1419 /* 1420 * This is the only safe state that this 1421 * option could be changed. Some segments 1422 * could already have been sent in other 1423 * states. 1424 */ 1425 if (optval > 0) 1426 tp->t_flags |= TF_SIGNATURE; 1427 else 1428 tp->t_flags &= ~TF_SIGNATURE; 1429 } else { 1430 error = EOPNOTSUPP; 1431 } 1432 break; 1433 #endif /* TCP_SIGNATURE */ 1434 case TCP_NODELAY: 1435 case TCP_NOOPT: 1436 switch (sopt->sopt_name) { 1437 case TCP_NODELAY: 1438 opt = TF_NODELAY; 1439 break; 1440 case TCP_NOOPT: 1441 opt = TF_NOOPT; 1442 break; 1443 default: 1444 opt = 0; /* dead code to fool gcc */ 1445 break; 1446 } 1447 1448 if (optval) 1449 tp->t_flags |= opt; 1450 else 1451 tp->t_flags &= ~opt; 1452 break; 1453 1454 case TCP_NOPUSH: 1455 if (tcp_disable_nopush) 1456 break; 1457 if (optval) 1458 tp->t_flags |= TF_NOPUSH; 1459 else { 1460 tp->t_flags &= ~TF_NOPUSH; 1461 error = tcp_output(tp); 1462 } 1463 break; 1464 1465 case TCP_MAXSEG: 1466 /* 1467 * Must be between 0 and maxseg. If the requested 1468 * maxseg is too small to satisfy the desired minmss, 1469 * pump it up (silently so sysctl modifications of 1470 * minmss do not create unexpected program failures). 1471 * Handle degenerate cases. 1472 */ 1473 if (optval > 0 && optval <= tp->t_maxseg) { 1474 if (optval + 40 < tcp_minmss) { 1475 optval = tcp_minmss - 40; 1476 if (optval < 0) 1477 optval = 1; 1478 } 1479 tp->t_maxseg = optval; 1480 } else { 1481 error = EINVAL; 1482 } 1483 break; 1484 1485 case TCP_KEEPINIT: 1486 opthz = ((int64_t)optval * hz) / 1000; 1487 if (opthz >= 1) 1488 tp->t_keepinit = opthz; 1489 else 1490 error = EINVAL; 1491 break; 1492 1493 case TCP_KEEPIDLE: 1494 opthz = ((int64_t)optval * hz) / 1000; 1495 if (opthz >= 1) { 1496 tp->t_keepidle = opthz; 1497 tcp_timer_keep_activity(tp, 0); 1498 } else { 1499 error = EINVAL; 1500 } 1501 break; 1502 1503 case TCP_KEEPINTVL: 1504 opthz = ((int64_t)optval * hz) / 1000; 1505 if (opthz >= 1) { 1506 tp->t_keepintvl = opthz; 1507 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt; 1508 } else { 1509 error = EINVAL; 1510 } 1511 break; 1512 1513 case TCP_KEEPCNT: 1514 if (optval > 0) { 1515 tp->t_keepcnt = optval; 1516 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt; 1517 } else { 1518 error = EINVAL; 1519 } 1520 break; 1521 1522 default: 1523 error = ENOPROTOOPT; 1524 break; 1525 } 1526 break; 1527 1528 case SOPT_GET: 1529 switch (sopt->sopt_name) { 1530 #ifdef TCP_SIGNATURE 1531 case TCP_SIGNATURE_ENABLE: 1532 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; 1533 break; 1534 #endif /* TCP_SIGNATURE */ 1535 case TCP_NODELAY: 1536 optval = tp->t_flags & TF_NODELAY; 1537 break; 1538 case TCP_MAXSEG: 1539 optval = tp->t_maxseg; 1540 break; 1541 case TCP_NOOPT: 1542 optval = tp->t_flags & TF_NOOPT; 1543 break; 1544 case TCP_NOPUSH: 1545 optval = tp->t_flags & TF_NOPUSH; 1546 break; 1547 case TCP_KEEPINIT: 1548 optval = ((int64_t)tp->t_keepinit * 1000) / hz; 1549 break; 1550 case TCP_KEEPIDLE: 1551 optval = ((int64_t)tp->t_keepidle * 1000) / hz; 1552 break; 1553 case TCP_KEEPINTVL: 1554 optval = ((int64_t)tp->t_keepintvl * 1000) / hz; 1555 break; 1556 case TCP_KEEPCNT: 1557 optval = tp->t_keepcnt; 1558 break; 1559 default: 1560 error = ENOPROTOOPT; 1561 break; 1562 } 1563 if (error == 0) 1564 soopt_from_kbuf(sopt, &optval, sizeof optval); 1565 break; 1566 } 1567 done: 1568 lwkt_replymsg(&msg->lmsg, error); 1569 } 1570 1571 /* 1572 * tcp_sendspace and tcp_recvspace are the default send and receive window 1573 * sizes, respectively. These are obsolescent (this information should 1574 * be set by the route). 1575 * 1576 * Use a default that does not require tcp window scaling to be turned 1577 * on. Individual programs or the administrator can increase the default. 1578 */ 1579 u_long tcp_sendspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ 1580 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, 1581 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); 1582 u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ 1583 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 1584 &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); 1585 1586 /* 1587 * Attach TCP protocol to socket, allocating internet protocol control 1588 * block, tcp control block, buffer space, and entering CLOSED state. 1589 */ 1590 static int 1591 tcp_attach(struct socket *so, struct pru_attach_info *ai) 1592 { 1593 struct tcpcb *tp; 1594 struct inpcb *inp; 1595 int error; 1596 int cpu; 1597 #ifdef INET6 1598 boolean_t isipv6 = INP_CHECK_SOCKAF(so, AF_INET6); 1599 #endif 1600 1601 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) { 1602 lwkt_gettoken(&so->so_rcv.ssb_token); 1603 error = soreserve(so, tcp_sendspace, tcp_recvspace, 1604 ai->sb_rlimit); 1605 lwkt_reltoken(&so->so_rcv.ssb_token); 1606 if (error) 1607 return (error); 1608 } 1609 atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE | SSB_PREALLOC); 1610 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE | SSB_PREALLOC); 1611 cpu = mycpu->gd_cpuid; 1612 1613 /* 1614 * Set the default port for protocol processing. This will likely 1615 * change when we connect. 1616 */ 1617 error = in_pcballoc(so, &tcbinfo[cpu]); 1618 if (error) 1619 return (error); 1620 inp = so->so_pcb; 1621 #ifdef INET6 1622 if (isipv6) 1623 inp->in6p_hops = -1; /* use kernel default */ 1624 #endif 1625 tp = tcp_newtcpcb(inp); 1626 if (tp == NULL) { 1627 /* 1628 * Make sure the socket is destroyed by the pcbdetach. 1629 */ 1630 soreference(so); 1631 #ifdef INET6 1632 if (isipv6) 1633 in6_pcbdetach(inp); 1634 else 1635 #endif 1636 in_pcbdetach(inp); 1637 sofree(so); /* from ref above */ 1638 return (ENOBUFS); 1639 } 1640 tp->t_state = TCPS_CLOSED; 1641 /* Keep a reference for asynchronized pru_rcvd */ 1642 soreference(so); 1643 return (0); 1644 } 1645 1646 /* 1647 * Initiate (or continue) disconnect. 1648 * If embryonic state, just send reset (once). 1649 * If in ``let data drain'' option and linger null, just drop. 1650 * Otherwise (hard), mark socket disconnecting and drop 1651 * current input data; switch states based on user close, and 1652 * send segment to peer (with FIN). 1653 */ 1654 static struct tcpcb * 1655 tcp_disconnect(struct tcpcb *tp) 1656 { 1657 struct socket *so = tp->t_inpcb->inp_socket; 1658 1659 if (tp->t_state < TCPS_ESTABLISHED) { 1660 tp = tcp_close(tp); 1661 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1662 tp = tcp_drop(tp, 0); 1663 } else { 1664 lwkt_gettoken(&so->so_rcv.ssb_token); 1665 soisdisconnecting(so); 1666 sbflush(&so->so_rcv.sb); 1667 tp = tcp_usrclosed(tp); 1668 if (tp) 1669 tcp_output(tp); 1670 lwkt_reltoken(&so->so_rcv.ssb_token); 1671 } 1672 return (tp); 1673 } 1674 1675 /* 1676 * User issued close, and wish to trail through shutdown states: 1677 * if never received SYN, just forget it. If got a SYN from peer, 1678 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1679 * If already got a FIN from peer, then almost done; go to LAST_ACK 1680 * state. In all other cases, have already sent FIN to peer (e.g. 1681 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1682 * for peer to send FIN or not respond to keep-alives, etc. 1683 * We can let the user exit from the close as soon as the FIN is acked. 1684 */ 1685 static struct tcpcb * 1686 tcp_usrclosed(struct tcpcb *tp) 1687 { 1688 1689 switch (tp->t_state) { 1690 1691 case TCPS_CLOSED: 1692 case TCPS_LISTEN: 1693 tp->t_state = TCPS_CLOSED; 1694 tp = tcp_close(tp); 1695 break; 1696 1697 case TCPS_SYN_SENT: 1698 case TCPS_SYN_RECEIVED: 1699 tp->t_flags |= TF_NEEDFIN; 1700 break; 1701 1702 case TCPS_ESTABLISHED: 1703 tp->t_state = TCPS_FIN_WAIT_1; 1704 break; 1705 1706 case TCPS_CLOSE_WAIT: 1707 tp->t_state = TCPS_LAST_ACK; 1708 break; 1709 } 1710 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) { 1711 soisdisconnected(tp->t_inpcb->inp_socket); 1712 /* To prevent the connection hanging in FIN_WAIT_2 forever. */ 1713 if (tp->t_state == TCPS_FIN_WAIT_2) { 1714 tcp_callout_reset(tp, tp->tt_2msl, tp->t_maxidle, 1715 tcp_timer_2msl); 1716 } 1717 } 1718 return (tp); 1719 } 1720