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 void tcp_connect (netmsg_t msg); 139 #ifdef INET6 140 static void tcp6_connect (netmsg_t msg); 141 static int tcp6_connect_oncpu(struct tcpcb *tp, int flags, 142 struct mbuf **mp, 143 struct sockaddr_in6 *sin6, 144 struct in6_addr *addr6); 145 #endif /* INET6 */ 146 static struct tcpcb * 147 tcp_disconnect (struct tcpcb *); 148 static struct tcpcb * 149 tcp_usrclosed (struct tcpcb *); 150 151 #ifdef TCPDEBUG 152 #define TCPDEBUG0 int ostate = 0 153 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 154 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 155 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 156 #else 157 #define TCPDEBUG0 158 #define TCPDEBUG1() 159 #define TCPDEBUG2(req) 160 #endif 161 162 /* 163 * TCP attaches to socket via pru_attach(), reserving space, 164 * and an internet control block. This is likely occuring on 165 * cpu0 and may have to move later when we bind/connect. 166 */ 167 static void 168 tcp_usr_attach(netmsg_t msg) 169 { 170 struct socket *so = msg->base.nm_so; 171 struct pru_attach_info *ai = msg->attach.nm_ai; 172 int error; 173 struct inpcb *inp; 174 struct tcpcb *tp = 0; 175 TCPDEBUG0; 176 177 soreference(so); 178 inp = so->so_pcb; 179 TCPDEBUG1(); 180 if (inp) { 181 error = EISCONN; 182 goto out; 183 } 184 185 error = tcp_attach(so, ai); 186 if (error) 187 goto out; 188 189 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 190 so->so_linger = TCP_LINGERTIME; 191 tp = sototcpcb(so); 192 out: 193 sofree(so); /* from ref above */ 194 TCPDEBUG2(PRU_ATTACH); 195 lwkt_replymsg(&msg->lmsg, error); 196 } 197 198 /* 199 * pru_detach() detaches the TCP protocol from the socket. 200 * If the protocol state is non-embryonic, then can't 201 * do this directly: have to initiate a pru_disconnect(), 202 * which may finish later; embryonic TCB's can just 203 * be discarded here. 204 */ 205 static void 206 tcp_usr_detach(netmsg_t msg) 207 { 208 struct socket *so = msg->base.nm_so; 209 int error = 0; 210 struct inpcb *inp; 211 struct tcpcb *tp; 212 TCPDEBUG0; 213 214 inp = so->so_pcb; 215 216 /* 217 * If the inp is already detached it may have been due to an async 218 * close. Just return as if no error occured. 219 * 220 * It's possible for the tcpcb (tp) to disconnect from the inp due 221 * to tcp_drop()->tcp_close() being called. This may occur *after* 222 * the detach message has been queued so we may find a NULL tp here. 223 */ 224 if (inp) { 225 if ((tp = intotcpcb(inp)) != NULL) { 226 TCPDEBUG1(); 227 tp = tcp_disconnect(tp); 228 TCPDEBUG2(PRU_DETACH); 229 } 230 } 231 lwkt_replymsg(&msg->lmsg, 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 * NOTE: The variables (msg) and (tp) are assumed. 240 */ 241 #define COMMON_START(so, inp, ignore_error) \ 242 TCPDEBUG0; \ 243 \ 244 inp = so->so_pcb; \ 245 do { \ 246 if (inp == NULL) { \ 247 error = ignore_error ? 0 : EINVAL; \ 248 tp = NULL; \ 249 goto out; \ 250 } \ 251 tp = intotcpcb(inp); \ 252 TCPDEBUG1(); \ 253 } while(0) 254 255 #define COMMON_END(req) \ 256 out: do { \ 257 TCPDEBUG2(req); \ 258 lwkt_replymsg(&msg->lmsg, error); \ 259 return; \ 260 } while(0) 261 262 /* 263 * Give the socket an address. 264 */ 265 static void 266 tcp_usr_bind(netmsg_t msg) 267 { 268 struct socket *so = msg->bind.base.nm_so; 269 struct sockaddr *nam = msg->bind.nm_nam; 270 struct thread *td = msg->bind.nm_td; 271 int error = 0; 272 struct inpcb *inp; 273 struct tcpcb *tp; 274 struct sockaddr_in *sinp; 275 276 COMMON_START(so, inp, 0); 277 278 /* 279 * Must check for multicast addresses and disallow binding 280 * to them. 281 */ 282 sinp = (struct sockaddr_in *)nam; 283 if (sinp->sin_family == AF_INET && 284 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 285 error = EAFNOSUPPORT; 286 goto out; 287 } 288 error = in_pcbbind(inp, nam, td); 289 if (error) 290 goto out; 291 COMMON_END(PRU_BIND); 292 293 } 294 295 #ifdef INET6 296 297 static void 298 tcp6_usr_bind(netmsg_t msg) 299 { 300 struct socket *so = msg->bind.base.nm_so; 301 struct sockaddr *nam = msg->bind.nm_nam; 302 struct thread *td = msg->bind.nm_td; 303 int error = 0; 304 struct inpcb *inp; 305 struct tcpcb *tp; 306 struct sockaddr_in6 *sin6p; 307 308 COMMON_START(so, inp, 0); 309 310 /* 311 * Must check for multicast addresses and disallow binding 312 * to them. 313 */ 314 sin6p = (struct sockaddr_in6 *)nam; 315 if (sin6p->sin6_family == AF_INET6 && 316 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 317 error = EAFNOSUPPORT; 318 goto out; 319 } 320 inp->inp_vflag &= ~INP_IPV4; 321 inp->inp_vflag |= INP_IPV6; 322 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 323 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 324 inp->inp_vflag |= INP_IPV4; 325 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 326 struct sockaddr_in sin; 327 328 in6_sin6_2_sin(&sin, sin6p); 329 inp->inp_vflag |= INP_IPV4; 330 inp->inp_vflag &= ~INP_IPV6; 331 error = in_pcbbind(inp, (struct sockaddr *)&sin, td); 332 goto out; 333 } 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 #ifdef SMP 343 344 struct netmsg_inswildcard { 345 struct netmsg_base base; 346 struct inpcb *nm_inp; 347 }; 348 349 static void 350 in_pcbinswildcardhash_handler(netmsg_t msg) 351 { 352 struct netmsg_inswildcard *nm = (struct netmsg_inswildcard *)msg; 353 int cpu = mycpuid, nextcpu; 354 355 in_pcbinswildcardhash_oncpu(nm->nm_inp, &tcbinfo[cpu]); 356 357 nextcpu = cpu + 1; 358 if (nextcpu < ncpus2) 359 lwkt_forwardmsg(cpu_portfn(nextcpu), &nm->base.lmsg); 360 else 361 lwkt_replymsg(&nm->base.lmsg, 0); 362 } 363 364 #endif 365 366 /* 367 * Prepare to accept connections. 368 */ 369 static void 370 tcp_usr_listen(netmsg_t msg) 371 { 372 struct socket *so = msg->listen.base.nm_so; 373 struct thread *td = msg->listen.nm_td; 374 int error = 0; 375 struct inpcb *inp; 376 struct tcpcb *tp; 377 #ifdef SMP 378 struct netmsg_inswildcard nm; 379 #endif 380 381 COMMON_START(so, inp, 0); 382 383 if (tp->t_flags & TF_LISTEN) 384 goto out; 385 386 if (inp->inp_lport == 0) { 387 error = in_pcbbind(inp, NULL, td); 388 if (error) 389 goto out; 390 } 391 392 tp->t_state = TCPS_LISTEN; 393 tp->t_flags |= TF_LISTEN; 394 tp->tt_msg = NULL; /* Catch any invalid timer usage */ 395 396 #ifdef SMP 397 if (ncpus > 1) { 398 /* 399 * We have to set the flag because we can't have other cpus 400 * messing with our inp's flags. 401 */ 402 KASSERT(!(inp->inp_flags & INP_CONNECTED), 403 ("already on connhash\n")); 404 KASSERT(!(inp->inp_flags & INP_WILDCARD), 405 ("already on wildcardhash\n")); 406 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP), 407 ("already on MP wildcardhash\n")); 408 inp->inp_flags |= INP_WILDCARD_MP; 409 410 KKASSERT(so->so_port == cpu_portfn(0)); 411 KKASSERT(&curthread->td_msgport == cpu_portfn(0)); 412 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]); 413 414 netmsg_init(&nm.base, NULL, &curthread->td_msgport, 415 MSGF_PRIORITY, in_pcbinswildcardhash_handler); 416 nm.nm_inp = inp; 417 lwkt_domsg(cpu_portfn(1), &nm.base.lmsg, 0); 418 } 419 #endif 420 in_pcbinswildcardhash(inp); 421 COMMON_END(PRU_LISTEN); 422 } 423 424 #ifdef INET6 425 426 static void 427 tcp6_usr_listen(netmsg_t msg) 428 { 429 struct socket *so = msg->listen.base.nm_so; 430 struct thread *td = msg->listen.nm_td; 431 int error = 0; 432 struct inpcb *inp; 433 struct tcpcb *tp; 434 #ifdef SMP 435 struct netmsg_inswildcard nm; 436 #endif 437 438 COMMON_START(so, inp, 0); 439 440 if (tp->t_flags & TF_LISTEN) 441 goto out; 442 443 if (inp->inp_lport == 0) { 444 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) 445 inp->inp_vflag |= INP_IPV4; 446 else 447 inp->inp_vflag &= ~INP_IPV4; 448 error = in6_pcbbind(inp, NULL, td); 449 if (error) 450 goto out; 451 } 452 453 tp->t_state = TCPS_LISTEN; 454 tp->t_flags |= TF_LISTEN; 455 tp->tt_msg = NULL; /* Catch any invalid timer usage */ 456 457 #ifdef SMP 458 if (ncpus > 1) { 459 /* 460 * We have to set the flag because we can't have other cpus 461 * messing with our inp's flags. 462 */ 463 KASSERT(!(inp->inp_flags & INP_CONNECTED), 464 ("already on connhash\n")); 465 KASSERT(!(inp->inp_flags & INP_WILDCARD), 466 ("already on wildcardhash\n")); 467 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP), 468 ("already on MP wildcardhash\n")); 469 inp->inp_flags |= INP_WILDCARD_MP; 470 471 KKASSERT(so->so_port == cpu_portfn(0)); 472 KKASSERT(&curthread->td_msgport == cpu_portfn(0)); 473 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]); 474 475 netmsg_init(&nm.base, NULL, &curthread->td_msgport, 476 MSGF_PRIORITY, in_pcbinswildcardhash_handler); 477 nm.nm_inp = inp; 478 lwkt_domsg(cpu_portfn(1), &nm.base.lmsg, 0); 479 } 480 #endif 481 in_pcbinswildcardhash(inp); 482 COMMON_END(PRU_LISTEN); 483 } 484 #endif /* INET6 */ 485 486 /* 487 * Initiate connection to peer. 488 * Create a template for use in transmissions on this connection. 489 * Enter SYN_SENT state, and mark socket as connecting. 490 * Start keep-alive timer, and seed output sequence space. 491 * Send initial segment on connection. 492 */ 493 static void 494 tcp_usr_connect(netmsg_t msg) 495 { 496 struct socket *so = msg->connect.base.nm_so; 497 struct sockaddr *nam = msg->connect.nm_nam; 498 struct thread *td = msg->connect.nm_td; 499 int error = 0; 500 struct inpcb *inp; 501 struct tcpcb *tp; 502 struct sockaddr_in *sinp; 503 504 COMMON_START(so, inp, 0); 505 506 /* 507 * Must disallow TCP ``connections'' to multicast addresses. 508 */ 509 sinp = (struct sockaddr_in *)nam; 510 if (sinp->sin_family == AF_INET 511 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 512 error = EAFNOSUPPORT; 513 goto out; 514 } 515 516 if (!prison_remote_ip(td, (struct sockaddr*)sinp)) { 517 error = EAFNOSUPPORT; /* IPv6 only jail */ 518 goto out; 519 } 520 521 tcp_connect(msg); 522 /* msg is invalid now */ 523 return; 524 out: 525 if (msg->connect.nm_m) { 526 m_freem(msg->connect.nm_m); 527 msg->connect.nm_m = NULL; 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 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 563 struct sockaddr_in *sinp; 564 565 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 566 error = EINVAL; 567 goto out; 568 } 569 sinp = kmalloc(sizeof(*sinp), M_LWKTMSG, M_INTWAIT); 570 in6_sin6_2_sin(sinp, sin6p); 571 inp->inp_vflag |= INP_IPV4; 572 inp->inp_vflag &= ~INP_IPV6; 573 msg->connect.nm_nam = (struct sockaddr *)sinp; 574 msg->connect.nm_reconnect |= NMSG_RECONNECT_NAMALLOC; 575 tcp_connect(msg); 576 /* msg is invalid now */ 577 return; 578 } 579 inp->inp_vflag &= ~INP_IPV4; 580 inp->inp_vflag |= INP_IPV6; 581 inp->inp_inc.inc_isipv6 = 1; 582 583 msg->connect.nm_reconnect |= NMSG_RECONNECT_FALLBACK; 584 tcp6_connect(msg); 585 /* msg is invalid now */ 586 return; 587 out: 588 if (msg->connect.nm_m) { 589 m_freem(msg->connect.nm_m); 590 msg->connect.nm_m = NULL; 591 } 592 lwkt_replymsg(&msg->lmsg, error); 593 } 594 595 #endif /* INET6 */ 596 597 /* 598 * Initiate disconnect from peer. 599 * If connection never passed embryonic stage, just drop; 600 * else if don't need to let data drain, then can just drop anyways, 601 * else have to begin TCP shutdown process: mark socket disconnecting, 602 * drain unread data, state switch to reflect user close, and 603 * send segment (e.g. FIN) to peer. Socket will be really disconnected 604 * when peer sends FIN and acks ours. 605 * 606 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 607 */ 608 static void 609 tcp_usr_disconnect(netmsg_t msg) 610 { 611 struct socket *so = msg->disconnect.base.nm_so; 612 int error = 0; 613 struct inpcb *inp; 614 struct tcpcb *tp; 615 616 COMMON_START(so, inp, 1); 617 tp = tcp_disconnect(tp); 618 COMMON_END(PRU_DISCONNECT); 619 } 620 621 /* 622 * Accept a connection. Essentially all the work is 623 * done at higher levels; just return the address 624 * of the peer, storing through addr. 625 */ 626 static void 627 tcp_usr_accept(netmsg_t msg) 628 { 629 struct socket *so = msg->accept.base.nm_so; 630 struct sockaddr **nam = msg->accept.nm_nam; 631 int error = 0; 632 struct inpcb *inp; 633 struct tcpcb *tp = NULL; 634 TCPDEBUG0; 635 636 inp = so->so_pcb; 637 if (so->so_state & SS_ISDISCONNECTED) { 638 error = ECONNABORTED; 639 goto out; 640 } 641 if (inp == 0) { 642 error = EINVAL; 643 goto out; 644 } 645 646 tp = intotcpcb(inp); 647 TCPDEBUG1(); 648 in_setpeeraddr(so, nam); 649 COMMON_END(PRU_ACCEPT); 650 } 651 652 #ifdef INET6 653 static void 654 tcp6_usr_accept(netmsg_t msg) 655 { 656 struct socket *so = msg->accept.base.nm_so; 657 struct sockaddr **nam = msg->accept.nm_nam; 658 int error = 0; 659 struct inpcb *inp; 660 struct tcpcb *tp = NULL; 661 TCPDEBUG0; 662 663 inp = so->so_pcb; 664 665 if (so->so_state & SS_ISDISCONNECTED) { 666 error = ECONNABORTED; 667 goto out; 668 } 669 if (inp == 0) { 670 error = EINVAL; 671 goto out; 672 } 673 tp = intotcpcb(inp); 674 TCPDEBUG1(); 675 in6_mapped_peeraddr(so, nam); 676 COMMON_END(PRU_ACCEPT); 677 } 678 #endif /* INET6 */ 679 /* 680 * Mark the connection as being incapable of further output. 681 */ 682 static void 683 tcp_usr_shutdown(netmsg_t msg) 684 { 685 struct socket *so = msg->shutdown.base.nm_so; 686 int error = 0; 687 struct inpcb *inp; 688 struct tcpcb *tp; 689 690 COMMON_START(so, inp, 0); 691 socantsendmore(so); 692 tp = tcp_usrclosed(tp); 693 if (tp) 694 error = tcp_output(tp); 695 COMMON_END(PRU_SHUTDOWN); 696 } 697 698 /* 699 * After a receive, possibly send window update to peer. 700 */ 701 static void 702 tcp_usr_rcvd(netmsg_t msg) 703 { 704 struct socket *so = msg->rcvd.base.nm_so; 705 int error = 0; 706 struct inpcb *inp; 707 struct tcpcb *tp; 708 709 COMMON_START(so, inp, 0); 710 tcp_output(tp); 711 COMMON_END(PRU_RCVD); 712 } 713 714 /* 715 * Do a send by putting data in output queue and updating urgent 716 * marker if URG set. Possibly send more data. Unlike the other 717 * pru_*() routines, the mbuf chains are our responsibility. We 718 * must either enqueue them or free them. The other pru_* routines 719 * generally are caller-frees. 720 */ 721 static void 722 tcp_usr_send(netmsg_t msg) 723 { 724 struct socket *so = msg->send.base.nm_so; 725 int flags = msg->send.nm_flags; 726 struct mbuf *m = msg->send.nm_m; 727 struct sockaddr *nam = msg->send.nm_addr; 728 struct mbuf *control = msg->send.nm_control; 729 struct thread *td = msg->send.nm_td; 730 int error = 0; 731 struct inpcb *inp; 732 struct tcpcb *tp; 733 #ifdef INET6 734 int isipv6; 735 #endif 736 TCPDEBUG0; 737 738 inp = so->so_pcb; 739 740 if (inp == NULL) { 741 /* 742 * OOPS! we lost a race, the TCP session got reset after 743 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a 744 * network interrupt in the non-critical section of sosend(). 745 */ 746 m_freem(m); 747 if (control) 748 m_freem(control); 749 error = ECONNRESET; /* XXX EPIPE? */ 750 tp = NULL; 751 TCPDEBUG1(); 752 goto out; 753 } 754 #ifdef INET6 755 isipv6 = nam && nam->sa_family == AF_INET6; 756 #endif /* INET6 */ 757 tp = intotcpcb(inp); 758 TCPDEBUG1(); 759 if (control) { 760 /* TCP doesn't do control messages (rights, creds, etc) */ 761 if (control->m_len) { 762 m_freem(control); 763 m_freem(m); 764 error = EINVAL; 765 goto out; 766 } 767 m_freem(control); /* empty control, just free it */ 768 } 769 770 /* 771 * Don't let too much OOB data build up 772 */ 773 if (flags & PRUS_OOB) { 774 if (ssb_space(&so->so_snd) < -512) { 775 m_freem(m); 776 error = ENOBUFS; 777 goto out; 778 } 779 } 780 781 /* 782 * Do implied connect if not yet connected. Any data sent 783 * with the connect is handled by tcp_connect() and friends. 784 * 785 * NOTE! PROTOCOL THREAD MAY BE CHANGED BY THE CONNECT! 786 */ 787 if (nam && tp->t_state < TCPS_SYN_SENT) { 788 kprintf("implied fallback\n"); 789 msg->connect.nm_nam = nam; 790 msg->connect.nm_td = td; 791 msg->connect.nm_m = m; 792 msg->connect.nm_flags = flags; 793 msg->connect.nm_reconnect = NMSG_RECONNECT_FALLBACK; 794 #ifdef INET6 795 if (isipv6) 796 tcp6_connect(msg); 797 else 798 #endif /* INET6 */ 799 tcp_connect(msg); 800 /* msg invalid now */ 801 return; 802 } 803 804 /* 805 * Pump the data into the socket. 806 */ 807 if (m) 808 ssb_appendstream(&so->so_snd, m); 809 if (flags & PRUS_OOB) { 810 /* 811 * According to RFC961 (Assigned Protocols), 812 * the urgent pointer points to the last octet 813 * of urgent data. We continue, however, 814 * to consider it to indicate the first octet 815 * of data past the urgent section. 816 * Otherwise, snd_up should be one lower. 817 */ 818 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 819 tp->t_flags |= TF_FORCE; 820 error = tcp_output(tp); 821 tp->t_flags &= ~TF_FORCE; 822 } else { 823 if (flags & PRUS_EOF) { 824 /* 825 * Close the send side of the connection after 826 * the data is sent. 827 */ 828 socantsendmore(so); 829 tp = tcp_usrclosed(tp); 830 } 831 if (tp != NULL) { 832 if (flags & PRUS_MORETOCOME) 833 tp->t_flags |= TF_MORETOCOME; 834 error = tcp_output(tp); 835 if (flags & PRUS_MORETOCOME) 836 tp->t_flags &= ~TF_MORETOCOME; 837 } 838 } 839 COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB : 840 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 841 } 842 843 /* 844 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort() 845 * will sofree() it when we return. 846 */ 847 static void 848 tcp_usr_abort(netmsg_t msg) 849 { 850 struct socket *so = msg->abort.base.nm_so; 851 int error = 0; 852 struct inpcb *inp; 853 struct tcpcb *tp; 854 855 COMMON_START(so, inp, 1); 856 tp = tcp_drop(tp, ECONNABORTED); 857 COMMON_END(PRU_ABORT); 858 } 859 860 /* 861 * Receive out-of-band data. 862 */ 863 static void 864 tcp_usr_rcvoob(netmsg_t msg) 865 { 866 struct socket *so = msg->rcvoob.base.nm_so; 867 struct mbuf *m = msg->rcvoob.nm_m; 868 int flags = msg->rcvoob.nm_flags; 869 int error = 0; 870 struct inpcb *inp; 871 struct tcpcb *tp; 872 873 COMMON_START(so, inp, 0); 874 if ((so->so_oobmark == 0 && 875 (so->so_state & SS_RCVATMARK) == 0) || 876 so->so_options & SO_OOBINLINE || 877 tp->t_oobflags & TCPOOB_HADDATA) { 878 error = EINVAL; 879 goto out; 880 } 881 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 882 error = EWOULDBLOCK; 883 goto out; 884 } 885 m->m_len = 1; 886 *mtod(m, caddr_t) = tp->t_iobc; 887 if ((flags & MSG_PEEK) == 0) 888 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 889 COMMON_END(PRU_RCVOOB); 890 } 891 892 /* xxx - should be const */ 893 struct pr_usrreqs tcp_usrreqs = { 894 .pru_abort = tcp_usr_abort, 895 .pru_accept = tcp_usr_accept, 896 .pru_attach = tcp_usr_attach, 897 .pru_bind = tcp_usr_bind, 898 .pru_connect = tcp_usr_connect, 899 .pru_connect2 = pr_generic_notsupp, 900 .pru_control = in_control_dispatch, 901 .pru_detach = tcp_usr_detach, 902 .pru_disconnect = tcp_usr_disconnect, 903 .pru_listen = tcp_usr_listen, 904 .pru_peeraddr = in_setpeeraddr_dispatch, 905 .pru_rcvd = tcp_usr_rcvd, 906 .pru_rcvoob = tcp_usr_rcvoob, 907 .pru_send = tcp_usr_send, 908 .pru_sense = pru_sense_null, 909 .pru_shutdown = tcp_usr_shutdown, 910 .pru_sockaddr = in_setsockaddr_dispatch, 911 .pru_sosend = sosend, 912 .pru_soreceive = soreceive 913 }; 914 915 #ifdef INET6 916 struct pr_usrreqs tcp6_usrreqs = { 917 .pru_abort = tcp_usr_abort, 918 .pru_accept = tcp6_usr_accept, 919 .pru_attach = tcp_usr_attach, 920 .pru_bind = tcp6_usr_bind, 921 .pru_connect = tcp6_usr_connect, 922 .pru_connect2 = pr_generic_notsupp, 923 .pru_control = in6_control_dispatch, 924 .pru_detach = tcp_usr_detach, 925 .pru_disconnect = tcp_usr_disconnect, 926 .pru_listen = tcp6_usr_listen, 927 .pru_peeraddr = in6_mapped_peeraddr_dispatch, 928 .pru_rcvd = tcp_usr_rcvd, 929 .pru_rcvoob = tcp_usr_rcvoob, 930 .pru_send = tcp_usr_send, 931 .pru_sense = pru_sense_null, 932 .pru_shutdown = tcp_usr_shutdown, 933 .pru_sockaddr = in6_mapped_sockaddr_dispatch, 934 .pru_sosend = sosend, 935 .pru_soreceive = soreceive 936 }; 937 #endif /* INET6 */ 938 939 static int 940 tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m, 941 struct sockaddr_in *sin, struct sockaddr_in *if_sin) 942 { 943 struct inpcb *inp = tp->t_inpcb, *oinp; 944 struct socket *so = inp->inp_socket; 945 struct route *ro = &inp->inp_route; 946 947 oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid], 948 sin->sin_addr, sin->sin_port, 949 (inp->inp_laddr.s_addr != INADDR_ANY ? 950 inp->inp_laddr : if_sin->sin_addr), 951 inp->inp_lport, 0, NULL); 952 if (oinp != NULL) { 953 m_freem(m); 954 return (EADDRINUSE); 955 } 956 if (inp->inp_laddr.s_addr == INADDR_ANY) 957 inp->inp_laddr = if_sin->sin_addr; 958 inp->inp_faddr = sin->sin_addr; 959 inp->inp_fport = sin->sin_port; 960 inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid]; 961 in_pcbinsconnhash(inp); 962 963 /* 964 * We are now on the inpcb's owner CPU, if the cached route was 965 * freed because the rtentry's owner CPU is not the current CPU 966 * (e.g. in tcp_connect()), then we try to reallocate it here with 967 * the hope that a rtentry may be cloned from a RTF_PRCLONING 968 * rtentry. 969 */ 970 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/ 971 ro->ro_rt == NULL) { 972 bzero(&ro->ro_dst, sizeof(struct sockaddr_in)); 973 ro->ro_dst.sa_family = AF_INET; 974 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 975 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = 976 sin->sin_addr; 977 rtalloc(ro); 978 } 979 980 /* 981 * Now that no more errors can occur, change the protocol processing 982 * port to the current thread (which is the correct thread). 983 * 984 * Create TCP timer message now; we are on the tcpcb's owner 985 * CPU/thread. 986 */ 987 tcp_create_timermsg(tp, &curthread->td_msgport); 988 989 /* 990 * Compute window scaling to request. Use a larger scaling then 991 * needed for the initial receive buffer in case the receive buffer 992 * gets expanded. 993 */ 994 if (tp->request_r_scale < TCP_MIN_WINSHIFT) 995 tp->request_r_scale = TCP_MIN_WINSHIFT; 996 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 997 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat 998 ) { 999 tp->request_r_scale++; 1000 } 1001 1002 soisconnecting(so); 1003 tcpstat.tcps_connattempt++; 1004 tp->t_state = TCPS_SYN_SENT; 1005 tcp_callout_reset(tp, tp->tt_keep, tcp_keepinit, tcp_timer_keep); 1006 tp->iss = tcp_new_isn(tp); 1007 tcp_sendseqinit(tp); 1008 if (m) { 1009 ssb_appendstream(&so->so_snd, m); 1010 m = NULL; 1011 if (flags & PRUS_OOB) 1012 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 1013 } 1014 1015 /* 1016 * Close the send side of the connection after 1017 * the data is sent if flagged. 1018 */ 1019 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) { 1020 socantsendmore(so); 1021 tp = tcp_usrclosed(tp); 1022 } 1023 return (tcp_output(tp)); 1024 } 1025 1026 /* 1027 * Common subroutine to open a TCP connection to remote host specified 1028 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1029 * port number if needed. Call in_pcbladdr to do the routing and to choose 1030 * a local host address (interface). 1031 * Initialize connection parameters and enter SYN-SENT state. 1032 */ 1033 static void 1034 tcp_connect(netmsg_t msg) 1035 { 1036 struct socket *so = msg->connect.base.nm_so; 1037 struct sockaddr *nam = msg->connect.nm_nam; 1038 struct thread *td = msg->connect.nm_td; 1039 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 1040 struct sockaddr_in *if_sin; 1041 struct inpcb *inp; 1042 struct tcpcb *tp; 1043 int error; 1044 #ifdef SMP 1045 lwkt_port_t port; 1046 #endif 1047 1048 COMMON_START(so, inp, 0); 1049 1050 /* 1051 * Reconnect our pcb if we have to 1052 */ 1053 if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) { 1054 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT; 1055 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1056 } 1057 1058 /* 1059 * Bind if we have to 1060 */ 1061 if (inp->inp_lport == 0) { 1062 error = in_pcbbind(inp, NULL, td); 1063 if (error) 1064 goto out; 1065 } 1066 so = inp->inp_socket; 1067 KKASSERT(so); 1068 1069 /* 1070 * Calculate the correct protocol processing thread. The connect 1071 * operation must run there. Set the forwarding port before we 1072 * forward the message or it will get bounced right back to us. 1073 */ 1074 error = in_pcbladdr(inp, nam, &if_sin, td); 1075 if (error) 1076 goto out; 1077 1078 #ifdef SMP 1079 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port, 1080 (inp->inp_laddr.s_addr ? 1081 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr), 1082 inp->inp_lport); 1083 1084 if (port != &curthread->td_msgport) { 1085 struct route *ro = &inp->inp_route; 1086 1087 /* 1088 * in_pcbladdr() may have allocated a route entry for us 1089 * on the current CPU, but we need a route entry on the 1090 * inpcb's owner CPU, so free it here. 1091 */ 1092 if (ro->ro_rt != NULL) 1093 RTFREE(ro->ro_rt); 1094 bzero(ro, sizeof(*ro)); 1095 1096 /* 1097 * We are moving the protocol processing port the socket 1098 * is on, we have to unlink here and re-link on the 1099 * target cpu. 1100 */ 1101 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1102 sosetport(so, port); 1103 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT; 1104 msg->connect.base.nm_dispatch = tcp_connect; 1105 1106 lwkt_forwardmsg(port, &msg->connect.base.lmsg); 1107 /* msg invalid now */ 1108 return; 1109 } 1110 #else 1111 KKASSERT(so->so_port == &curthread->td_msgport); 1112 #endif 1113 error = tcp_connect_oncpu(tp, msg->connect.nm_flags, 1114 msg->connect.nm_m, sin, if_sin); 1115 msg->connect.nm_m = NULL; 1116 out: 1117 if (msg->connect.nm_m) { 1118 m_freem(msg->connect.nm_m); 1119 msg->connect.nm_m = NULL; 1120 } 1121 if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) { 1122 kfree(msg->connect.nm_nam, M_LWKTMSG); 1123 msg->connect.nm_nam = NULL; 1124 } 1125 lwkt_replymsg(&msg->connect.base.lmsg, error); 1126 /* msg invalid now */ 1127 } 1128 1129 #ifdef INET6 1130 1131 static void 1132 tcp6_connect(netmsg_t msg) 1133 { 1134 struct tcpcb *tp; 1135 struct socket *so = msg->connect.base.nm_so; 1136 struct sockaddr *nam = msg->connect.nm_nam; 1137 struct thread *td = msg->connect.nm_td; 1138 struct inpcb *inp; 1139 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 1140 struct in6_addr *addr6; 1141 #ifdef SMP 1142 lwkt_port_t port; 1143 #endif 1144 int error; 1145 1146 COMMON_START(so, inp, 0); 1147 1148 /* 1149 * Reconnect our pcb if we have to 1150 */ 1151 if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) { 1152 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT; 1153 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1154 } 1155 1156 /* 1157 * Bind if we have to 1158 */ 1159 if (inp->inp_lport == 0) { 1160 error = in6_pcbbind(inp, NULL, td); 1161 if (error) 1162 goto out; 1163 } 1164 1165 /* 1166 * Cannot simply call in_pcbconnect, because there might be an 1167 * earlier incarnation of this same connection still in 1168 * TIME_WAIT state, creating an ADDRINUSE error. 1169 */ 1170 error = in6_pcbladdr(inp, nam, &addr6, td); 1171 if (error) 1172 goto out; 1173 1174 #ifdef SMP 1175 port = tcp6_addrport(); /* XXX hack for now, always cpu0 */ 1176 1177 if (port != &curthread->td_msgport) { 1178 struct route *ro = &inp->inp_route; 1179 1180 /* 1181 * in_pcbladdr() may have allocated a route entry for us 1182 * on the current CPU, but we need a route entry on the 1183 * inpcb's owner CPU, so free it here. 1184 */ 1185 if (ro->ro_rt != NULL) 1186 RTFREE(ro->ro_rt); 1187 bzero(ro, sizeof(*ro)); 1188 1189 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1190 sosetport(so, port); 1191 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT; 1192 msg->connect.base.nm_dispatch = tcp6_connect; 1193 1194 lwkt_forwardmsg(port, &msg->connect.base.lmsg); 1195 /* msg invalid now */ 1196 return; 1197 } 1198 #endif 1199 error = tcp6_connect_oncpu(tp, msg->connect.nm_flags, 1200 &msg->connect.nm_m, sin6, addr6); 1201 /* nm_m may still be intact */ 1202 out: 1203 if (error && (msg->connect.nm_reconnect & NMSG_RECONNECT_FALLBACK)) { 1204 tcp_connect(msg); 1205 /* msg invalid now */ 1206 } else { 1207 if (msg->connect.nm_m) { 1208 m_freem(msg->connect.nm_m); 1209 msg->connect.nm_m = NULL; 1210 } 1211 if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) { 1212 kfree(msg->connect.nm_nam, M_LWKTMSG); 1213 msg->connect.nm_nam = NULL; 1214 } 1215 lwkt_replymsg(&msg->connect.base.lmsg, error); 1216 /* msg invalid now */ 1217 } 1218 } 1219 1220 static int 1221 tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp, 1222 struct sockaddr_in6 *sin6, struct in6_addr *addr6) 1223 { 1224 struct mbuf *m = *mp; 1225 struct inpcb *inp = tp->t_inpcb; 1226 struct socket *so = inp->inp_socket; 1227 struct inpcb *oinp; 1228 1229 /* 1230 * Cannot simply call in_pcbconnect, because there might be an 1231 * earlier incarnation of this same connection still in 1232 * TIME_WAIT state, creating an ADDRINUSE error. 1233 */ 1234 oinp = in6_pcblookup_hash(inp->inp_cpcbinfo, 1235 &sin6->sin6_addr, sin6->sin6_port, 1236 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ? 1237 addr6 : &inp->in6p_laddr), 1238 inp->inp_lport, 0, NULL); 1239 if (oinp) 1240 return (EADDRINUSE); 1241 1242 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1243 inp->in6p_laddr = *addr6; 1244 inp->in6p_faddr = sin6->sin6_addr; 1245 inp->inp_fport = sin6->sin6_port; 1246 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0) 1247 inp->in6p_flowinfo = sin6->sin6_flowinfo; 1248 in_pcbinsconnhash(inp); 1249 1250 /* 1251 * Now that no more errors can occur, change the protocol processing 1252 * port to the current thread (which is the correct thread). 1253 * 1254 * Create TCP timer message now; we are on the tcpcb's owner 1255 * CPU/thread. 1256 */ 1257 tcp_create_timermsg(tp, &curthread->td_msgport); 1258 1259 /* Compute window scaling to request. */ 1260 if (tp->request_r_scale < TCP_MIN_WINSHIFT) 1261 tp->request_r_scale = TCP_MIN_WINSHIFT; 1262 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1263 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) { 1264 tp->request_r_scale++; 1265 } 1266 1267 soisconnecting(so); 1268 tcpstat.tcps_connattempt++; 1269 tp->t_state = TCPS_SYN_SENT; 1270 tcp_callout_reset(tp, tp->tt_keep, tcp_keepinit, tcp_timer_keep); 1271 tp->iss = tcp_new_isn(tp); 1272 tcp_sendseqinit(tp); 1273 if (m) { 1274 ssb_appendstream(&so->so_snd, m); 1275 *mp = NULL; 1276 if (flags & PRUS_OOB) 1277 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 1278 } 1279 1280 /* 1281 * Close the send side of the connection after 1282 * the data is sent if flagged. 1283 */ 1284 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) { 1285 socantsendmore(so); 1286 tp = tcp_usrclosed(tp); 1287 } 1288 return (tcp_output(tp)); 1289 } 1290 1291 #endif /* INET6 */ 1292 1293 /* 1294 * The new sockopt interface makes it possible for us to block in the 1295 * copyin/out step (if we take a page fault). Taking a page fault while 1296 * in a critical section is probably a Bad Thing. (Since sockets and pcbs 1297 * both now use TSM, there probably isn't any need for this function to 1298 * run in a critical section any more. This needs more examination.) 1299 */ 1300 void 1301 tcp_ctloutput(netmsg_t msg) 1302 { 1303 struct socket *so = msg->base.nm_so; 1304 struct sockopt *sopt = msg->ctloutput.nm_sopt; 1305 int error, opt, optval; 1306 struct inpcb *inp; 1307 struct tcpcb *tp; 1308 1309 error = 0; 1310 inp = so->so_pcb; 1311 if (inp == NULL) { 1312 error = ECONNRESET; 1313 goto done; 1314 } 1315 1316 if (sopt->sopt_level != IPPROTO_TCP) { 1317 #ifdef INET6 1318 if (INP_CHECK_SOCKAF(so, AF_INET6)) 1319 ip6_ctloutput_dispatch(msg); 1320 else 1321 #endif /* INET6 */ 1322 ip_ctloutput(msg); 1323 /* msg invalid now */ 1324 return; 1325 } 1326 tp = intotcpcb(inp); 1327 1328 switch (sopt->sopt_dir) { 1329 case SOPT_SET: 1330 error = soopt_to_kbuf(sopt, &optval, sizeof optval, 1331 sizeof optval); 1332 if (error) 1333 break; 1334 switch (sopt->sopt_name) { 1335 case TCP_FASTKEEP: 1336 if (optval > 0) { 1337 if ((tp->t_flags & TF_FASTKEEP) == 0) { 1338 tp->t_flags |= TF_FASTKEEP; 1339 tcp_timer_keep_activity(tp, 0); 1340 } 1341 } else { 1342 tp->t_flags &= ~TF_FASTKEEP; 1343 } 1344 break; 1345 #ifdef TCP_SIGNATURE 1346 case TCP_SIGNATURE_ENABLE: 1347 if (optval > 0) 1348 tp->t_flags |= TF_SIGNATURE; 1349 else 1350 tp->t_flags &= ~TF_SIGNATURE; 1351 break; 1352 #endif /* TCP_SIGNATURE */ 1353 case TCP_NODELAY: 1354 case TCP_NOOPT: 1355 switch (sopt->sopt_name) { 1356 case TCP_NODELAY: 1357 opt = TF_NODELAY; 1358 break; 1359 case TCP_NOOPT: 1360 opt = TF_NOOPT; 1361 break; 1362 default: 1363 opt = 0; /* dead code to fool gcc */ 1364 break; 1365 } 1366 1367 if (optval) 1368 tp->t_flags |= opt; 1369 else 1370 tp->t_flags &= ~opt; 1371 break; 1372 1373 case TCP_NOPUSH: 1374 if (optval) 1375 tp->t_flags |= TF_NOPUSH; 1376 else { 1377 tp->t_flags &= ~TF_NOPUSH; 1378 error = tcp_output(tp); 1379 } 1380 break; 1381 1382 case TCP_MAXSEG: 1383 /* 1384 * Must be between 0 and maxseg. If the requested 1385 * maxseg is too small to satisfy the desired minmss, 1386 * pump it up (silently so sysctl modifications of 1387 * minmss do not create unexpected program failures). 1388 * Handle degenerate cases. 1389 */ 1390 if (optval > 0 && optval <= tp->t_maxseg) { 1391 if (optval + 40 < tcp_minmss) { 1392 optval = tcp_minmss - 40; 1393 if (optval < 0) 1394 optval = 1; 1395 } 1396 tp->t_maxseg = optval; 1397 } else { 1398 error = EINVAL; 1399 } 1400 break; 1401 1402 default: 1403 error = ENOPROTOOPT; 1404 break; 1405 } 1406 break; 1407 1408 case SOPT_GET: 1409 switch (sopt->sopt_name) { 1410 #ifdef TCP_SIGNATURE 1411 case TCP_SIGNATURE_ENABLE: 1412 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; 1413 break; 1414 #endif /* TCP_SIGNATURE */ 1415 case TCP_NODELAY: 1416 optval = tp->t_flags & TF_NODELAY; 1417 break; 1418 case TCP_MAXSEG: 1419 optval = tp->t_maxseg; 1420 break; 1421 case TCP_NOOPT: 1422 optval = tp->t_flags & TF_NOOPT; 1423 break; 1424 case TCP_NOPUSH: 1425 optval = tp->t_flags & TF_NOPUSH; 1426 break; 1427 default: 1428 error = ENOPROTOOPT; 1429 break; 1430 } 1431 if (error == 0) 1432 soopt_from_kbuf(sopt, &optval, sizeof optval); 1433 break; 1434 } 1435 done: 1436 lwkt_replymsg(&msg->lmsg, error); 1437 } 1438 1439 /* 1440 * tcp_sendspace and tcp_recvspace are the default send and receive window 1441 * sizes, respectively. These are obsolescent (this information should 1442 * be set by the route). 1443 * 1444 * Use a default that does not require tcp window scaling to be turned 1445 * on. Individual programs or the administrator can increase the default. 1446 */ 1447 u_long tcp_sendspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ 1448 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, 1449 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); 1450 u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ 1451 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 1452 &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); 1453 1454 /* 1455 * Attach TCP protocol to socket, allocating internet protocol control 1456 * block, tcp control block, bufer space, and entering LISTEN state 1457 * if to accept connections. 1458 */ 1459 static int 1460 tcp_attach(struct socket *so, struct pru_attach_info *ai) 1461 { 1462 struct tcpcb *tp; 1463 struct inpcb *inp; 1464 int error; 1465 int cpu; 1466 #ifdef INET6 1467 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0; 1468 #endif 1469 1470 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) { 1471 lwkt_gettoken(&so->so_rcv.ssb_token); 1472 error = soreserve(so, tcp_sendspace, tcp_recvspace, 1473 ai->sb_rlimit); 1474 lwkt_reltoken(&so->so_rcv.ssb_token); 1475 if (error) 1476 return (error); 1477 } 1478 atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE); 1479 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE); 1480 cpu = mycpu->gd_cpuid; 1481 1482 /* 1483 * Set the default port for protocol processing. This will likely 1484 * change when we connect. 1485 */ 1486 error = in_pcballoc(so, &tcbinfo[cpu]); 1487 if (error) 1488 return (error); 1489 inp = so->so_pcb; 1490 #ifdef INET6 1491 if (isipv6) { 1492 inp->inp_vflag |= INP_IPV6; 1493 inp->in6p_hops = -1; /* use kernel default */ 1494 } 1495 else 1496 #endif 1497 inp->inp_vflag |= INP_IPV4; 1498 tp = tcp_newtcpcb(inp); 1499 if (tp == NULL) { 1500 /* 1501 * Make sure the socket is destroyed by the pcbdetach. 1502 */ 1503 soreference(so); 1504 #ifdef INET6 1505 if (isipv6) 1506 in6_pcbdetach(inp); 1507 else 1508 #endif 1509 in_pcbdetach(inp); 1510 sofree(so); /* from ref above */ 1511 return (ENOBUFS); 1512 } 1513 tp->t_state = TCPS_CLOSED; 1514 return (0); 1515 } 1516 1517 /* 1518 * Initiate (or continue) disconnect. 1519 * If embryonic state, just send reset (once). 1520 * If in ``let data drain'' option and linger null, just drop. 1521 * Otherwise (hard), mark socket disconnecting and drop 1522 * current input data; switch states based on user close, and 1523 * send segment to peer (with FIN). 1524 */ 1525 static struct tcpcb * 1526 tcp_disconnect(struct tcpcb *tp) 1527 { 1528 struct socket *so = tp->t_inpcb->inp_socket; 1529 1530 if (tp->t_state < TCPS_ESTABLISHED) { 1531 tp = tcp_close(tp); 1532 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1533 tp = tcp_drop(tp, 0); 1534 } else { 1535 lwkt_gettoken(&so->so_rcv.ssb_token); 1536 soisdisconnecting(so); 1537 sbflush(&so->so_rcv.sb); 1538 tp = tcp_usrclosed(tp); 1539 if (tp) 1540 tcp_output(tp); 1541 lwkt_reltoken(&so->so_rcv.ssb_token); 1542 } 1543 return (tp); 1544 } 1545 1546 /* 1547 * User issued close, and wish to trail through shutdown states: 1548 * if never received SYN, just forget it. If got a SYN from peer, 1549 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1550 * If already got a FIN from peer, then almost done; go to LAST_ACK 1551 * state. In all other cases, have already sent FIN to peer (e.g. 1552 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1553 * for peer to send FIN or not respond to keep-alives, etc. 1554 * We can let the user exit from the close as soon as the FIN is acked. 1555 */ 1556 static struct tcpcb * 1557 tcp_usrclosed(struct tcpcb *tp) 1558 { 1559 1560 switch (tp->t_state) { 1561 1562 case TCPS_CLOSED: 1563 case TCPS_LISTEN: 1564 tp->t_state = TCPS_CLOSED; 1565 tp = tcp_close(tp); 1566 break; 1567 1568 case TCPS_SYN_SENT: 1569 case TCPS_SYN_RECEIVED: 1570 tp->t_flags |= TF_NEEDFIN; 1571 break; 1572 1573 case TCPS_ESTABLISHED: 1574 tp->t_state = TCPS_FIN_WAIT_1; 1575 break; 1576 1577 case TCPS_CLOSE_WAIT: 1578 tp->t_state = TCPS_LAST_ACK; 1579 break; 1580 } 1581 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) { 1582 soisdisconnected(tp->t_inpcb->inp_socket); 1583 /* To prevent the connection hanging in FIN_WAIT_2 forever. */ 1584 if (tp->t_state == TCPS_FIN_WAIT_2) { 1585 tcp_callout_reset(tp, tp->tt_2msl, tcp_maxidle, 1586 tcp_timer_2msl); 1587 } 1588 } 1589 return (tp); 1590 } 1591