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 inp->inp_vflag &= ~INP_IPV4; 336 inp->inp_vflag |= INP_IPV6; 337 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 338 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 339 inp->inp_vflag |= INP_IPV4; 340 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 341 struct sockaddr_in sin; 342 343 in6_sin6_2_sin(&sin, sin6p); 344 inp->inp_vflag |= INP_IPV4; 345 inp->inp_vflag &= ~INP_IPV6; 346 error = in_pcbbind(inp, (struct sockaddr *)&sin, td); 347 goto out; 348 } 349 } 350 error = in6_pcbbind(inp, nam, td); 351 if (error) 352 goto out; 353 COMMON_END(PRU_BIND); 354 } 355 #endif /* INET6 */ 356 357 struct netmsg_inswildcard { 358 struct netmsg_base base; 359 struct inpcb *nm_inp; 360 }; 361 362 static void 363 in_pcbinswildcardhash_handler(netmsg_t msg) 364 { 365 struct netmsg_inswildcard *nm = (struct netmsg_inswildcard *)msg; 366 int cpu = mycpuid, nextcpu; 367 368 in_pcbinswildcardhash_oncpu(nm->nm_inp, &tcbinfo[cpu]); 369 370 nextcpu = cpu + 1; 371 if (nextcpu < ncpus2) 372 lwkt_forwardmsg(netisr_cpuport(nextcpu), &nm->base.lmsg); 373 else 374 lwkt_replymsg(&nm->base.lmsg, 0); 375 } 376 377 static void 378 tcp_sosetport(struct lwkt_msg *msg, lwkt_port_t port) 379 { 380 sosetport(((struct netmsg_base *)msg)->nm_so, port); 381 } 382 383 /* 384 * Prepare to accept connections. 385 */ 386 static void 387 tcp_usr_listen(netmsg_t msg) 388 { 389 struct socket *so = msg->listen.base.nm_so; 390 struct thread *td = msg->listen.nm_td; 391 int error = 0; 392 struct inpcb *inp; 393 struct tcpcb *tp; 394 struct netmsg_inswildcard nm; 395 lwkt_port_t port0 = netisr_cpuport(0); 396 397 COMMON_START(so, inp, 0); 398 399 if (&curthread->td_msgport != port0) { 400 lwkt_msg_t lmsg = &msg->listen.base.lmsg; 401 402 KASSERT((msg->listen.nm_flags & PRUL_RELINK) == 0, 403 ("already asked to relink")); 404 405 in_pcbunlink(so->so_pcb, &tcbinfo[mycpuid]); 406 msg->listen.nm_flags |= PRUL_RELINK; 407 408 /* See the related comment in tcp_connect() */ 409 lwkt_setmsg_receipt(lmsg, tcp_sosetport); 410 lwkt_forwardmsg(port0, lmsg); 411 /* msg invalid now */ 412 return; 413 } 414 KASSERT(so->so_port == port0, ("so_port is not netisr0")); 415 416 if (msg->listen.nm_flags & PRUL_RELINK) { 417 msg->listen.nm_flags &= ~PRUL_RELINK; 418 in_pcblink(so->so_pcb, &tcbinfo[mycpuid]); 419 } 420 KASSERT(inp->inp_pcbinfo == &tcbinfo[0], ("pcbinfo is not tcbinfo0")); 421 422 if (tp->t_flags & TF_LISTEN) 423 goto out; 424 425 if (inp->inp_lport == 0) { 426 error = in_pcbbind(inp, NULL, td); 427 if (error) 428 goto out; 429 } 430 431 tp->t_state = TCPS_LISTEN; 432 tp->t_flags |= TF_LISTEN; 433 tp->tt_msg = NULL; /* Catch any invalid timer usage */ 434 435 if (ncpus2 > 1) { 436 /* 437 * Put this inpcb into wildcard hash on other cpus. 438 */ 439 ASSERT_INP_NOTINHASH(inp); 440 netmsg_init(&nm.base, NULL, &curthread->td_msgport, 441 MSGF_PRIORITY, in_pcbinswildcardhash_handler); 442 nm.nm_inp = inp; 443 lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0); 444 } 445 in_pcbinswildcardhash(inp); 446 COMMON_END(PRU_LISTEN); 447 } 448 449 #ifdef INET6 450 451 static void 452 tcp6_usr_listen(netmsg_t msg) 453 { 454 struct socket *so = msg->listen.base.nm_so; 455 struct thread *td = msg->listen.nm_td; 456 int error = 0; 457 struct inpcb *inp; 458 struct tcpcb *tp; 459 struct netmsg_inswildcard nm; 460 461 COMMON_START(so, inp, 0); 462 463 if (tp->t_flags & TF_LISTEN) 464 goto out; 465 466 if (inp->inp_lport == 0) { 467 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) 468 inp->inp_vflag |= INP_IPV4; 469 else 470 inp->inp_vflag &= ~INP_IPV4; 471 error = in6_pcbbind(inp, NULL, td); 472 if (error) 473 goto out; 474 } 475 476 tp->t_state = TCPS_LISTEN; 477 tp->t_flags |= TF_LISTEN; 478 tp->tt_msg = NULL; /* Catch any invalid timer usage */ 479 480 if (ncpus2 > 1) { 481 /* 482 * Put this inpcb into wildcard hash on other cpus. 483 */ 484 KKASSERT(so->so_port == netisr_cpuport(0)); 485 KKASSERT(&curthread->td_msgport == netisr_cpuport(0)); 486 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]); 487 ASSERT_INP_NOTINHASH(inp); 488 489 netmsg_init(&nm.base, NULL, &curthread->td_msgport, 490 MSGF_PRIORITY, in_pcbinswildcardhash_handler); 491 nm.nm_inp = inp; 492 lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0); 493 } 494 in_pcbinswildcardhash(inp); 495 COMMON_END(PRU_LISTEN); 496 } 497 #endif /* INET6 */ 498 499 /* 500 * Initiate connection to peer. 501 * Create a template for use in transmissions on this connection. 502 * Enter SYN_SENT state, and mark socket as connecting. 503 * Start keep-alive timer, and seed output sequence space. 504 * Send initial segment on connection. 505 */ 506 static void 507 tcp_usr_connect(netmsg_t msg) 508 { 509 struct socket *so = msg->connect.base.nm_so; 510 struct sockaddr *nam = msg->connect.nm_nam; 511 struct thread *td = msg->connect.nm_td; 512 int error = 0; 513 struct inpcb *inp; 514 struct tcpcb *tp; 515 struct sockaddr_in *sinp; 516 517 COMMON_START(so, inp, 0); 518 519 /* 520 * Must disallow TCP ``connections'' to multicast addresses. 521 */ 522 sinp = (struct sockaddr_in *)nam; 523 if (sinp->sin_family == AF_INET 524 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 525 error = EAFNOSUPPORT; 526 goto out; 527 } 528 529 if (!prison_remote_ip(td, (struct sockaddr*)sinp)) { 530 error = EAFNOSUPPORT; /* IPv6 only jail */ 531 goto out; 532 } 533 534 tcp_connect(msg); 535 /* msg is invalid now */ 536 return; 537 out: 538 if (msg->connect.nm_m) { 539 m_freem(msg->connect.nm_m); 540 msg->connect.nm_m = NULL; 541 } 542 if (msg->connect.nm_flags & PRUC_HELDTD) 543 lwkt_rele(td); 544 if (error && (msg->connect.nm_flags & PRUC_ASYNC)) { 545 so->so_error = error; 546 soisdisconnected(so); 547 } 548 lwkt_replymsg(&msg->lmsg, error); 549 } 550 551 #ifdef INET6 552 553 static void 554 tcp6_usr_connect(netmsg_t msg) 555 { 556 struct socket *so = msg->connect.base.nm_so; 557 struct sockaddr *nam = msg->connect.nm_nam; 558 struct thread *td = msg->connect.nm_td; 559 int error = 0; 560 struct inpcb *inp; 561 struct tcpcb *tp; 562 struct sockaddr_in6 *sin6p; 563 564 COMMON_START(so, inp, 0); 565 566 /* 567 * Must disallow TCP ``connections'' to multicast addresses. 568 */ 569 sin6p = (struct sockaddr_in6 *)nam; 570 if (sin6p->sin6_family == AF_INET6 571 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 572 error = EAFNOSUPPORT; 573 goto out; 574 } 575 576 if (!prison_remote_ip(td, nam)) { 577 error = EAFNOSUPPORT; /* IPv4 only jail */ 578 goto out; 579 } 580 581 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 582 struct sockaddr_in *sinp; 583 584 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 585 error = EINVAL; 586 goto out; 587 } 588 sinp = kmalloc(sizeof(*sinp), M_LWKTMSG, M_INTWAIT); 589 in6_sin6_2_sin(sinp, sin6p); 590 inp->inp_vflag |= INP_IPV4; 591 inp->inp_vflag &= ~INP_IPV6; 592 msg->connect.nm_nam = (struct sockaddr *)sinp; 593 msg->connect.nm_flags |= PRUC_NAMALLOC; 594 tcp_connect(msg); 595 /* msg is invalid now */ 596 return; 597 } 598 inp->inp_vflag &= ~INP_IPV4; 599 inp->inp_vflag |= INP_IPV6; 600 inp->inp_inc.inc_isipv6 = 1; 601 602 msg->connect.nm_flags |= PRUC_FALLBACK; 603 tcp6_connect(msg); 604 /* msg is invalid now */ 605 return; 606 out: 607 if (msg->connect.nm_m) { 608 m_freem(msg->connect.nm_m); 609 msg->connect.nm_m = NULL; 610 } 611 lwkt_replymsg(&msg->lmsg, error); 612 } 613 614 #endif /* INET6 */ 615 616 /* 617 * Initiate disconnect from peer. 618 * If connection never passed embryonic stage, just drop; 619 * else if don't need to let data drain, then can just drop anyways, 620 * else have to begin TCP shutdown process: mark socket disconnecting, 621 * drain unread data, state switch to reflect user close, and 622 * send segment (e.g. FIN) to peer. Socket will be really disconnected 623 * when peer sends FIN and acks ours. 624 * 625 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 626 */ 627 static void 628 tcp_usr_disconnect(netmsg_t msg) 629 { 630 struct socket *so = msg->disconnect.base.nm_so; 631 int error = 0; 632 struct inpcb *inp; 633 struct tcpcb *tp; 634 635 COMMON_START(so, inp, 1); 636 tp = tcp_disconnect(tp); 637 COMMON_END(PRU_DISCONNECT); 638 } 639 640 /* 641 * Accept a connection. Essentially all the work is 642 * done at higher levels; just return the address 643 * of the peer, storing through addr. 644 */ 645 static void 646 tcp_usr_accept(netmsg_t msg) 647 { 648 struct socket *so = msg->accept.base.nm_so; 649 struct sockaddr **nam = msg->accept.nm_nam; 650 int error = 0; 651 struct inpcb *inp; 652 struct tcpcb *tp = NULL; 653 TCPDEBUG0; 654 655 inp = so->so_pcb; 656 if (so->so_state & SS_ISDISCONNECTED) { 657 error = ECONNABORTED; 658 goto out; 659 } 660 if (inp == 0) { 661 error = EINVAL; 662 goto out; 663 } 664 665 tp = intotcpcb(inp); 666 TCPDEBUG1(); 667 in_setpeeraddr(so, nam); 668 COMMON_END(PRU_ACCEPT); 669 } 670 671 #ifdef INET6 672 static void 673 tcp6_usr_accept(netmsg_t msg) 674 { 675 struct socket *so = msg->accept.base.nm_so; 676 struct sockaddr **nam = msg->accept.nm_nam; 677 int error = 0; 678 struct inpcb *inp; 679 struct tcpcb *tp = NULL; 680 TCPDEBUG0; 681 682 inp = so->so_pcb; 683 684 if (so->so_state & SS_ISDISCONNECTED) { 685 error = ECONNABORTED; 686 goto out; 687 } 688 if (inp == 0) { 689 error = EINVAL; 690 goto out; 691 } 692 tp = intotcpcb(inp); 693 TCPDEBUG1(); 694 in6_mapped_peeraddr(so, nam); 695 COMMON_END(PRU_ACCEPT); 696 } 697 #endif /* INET6 */ 698 /* 699 * Mark the connection as being incapable of further output. 700 */ 701 static void 702 tcp_usr_shutdown(netmsg_t msg) 703 { 704 struct socket *so = msg->shutdown.base.nm_so; 705 int error = 0; 706 struct inpcb *inp; 707 struct tcpcb *tp; 708 709 COMMON_START(so, inp, 0); 710 socantsendmore(so); 711 tp = tcp_usrclosed(tp); 712 if (tp) 713 error = tcp_output(tp); 714 COMMON_END(PRU_SHUTDOWN); 715 } 716 717 /* 718 * After a receive, possibly send window update to peer. 719 */ 720 static void 721 tcp_usr_rcvd(netmsg_t msg) 722 { 723 struct socket *so = msg->rcvd.base.nm_so; 724 int error = 0, noreply = 0; 725 struct inpcb *inp; 726 struct tcpcb *tp; 727 728 COMMON_START(so, inp, 0); 729 730 if (msg->rcvd.nm_pru_flags & PRUR_ASYNC) { 731 noreply = 1; 732 so_async_rcvd_reply(so); 733 } 734 tcp_output(tp); 735 736 COMMON_END1(PRU_RCVD, noreply); 737 } 738 739 /* 740 * Do a send by putting data in output queue and updating urgent 741 * marker if URG set. Possibly send more data. Unlike the other 742 * pru_*() routines, the mbuf chains are our responsibility. We 743 * must either enqueue them or free them. The other pru_* routines 744 * generally are caller-frees. 745 */ 746 static void 747 tcp_usr_send(netmsg_t msg) 748 { 749 struct socket *so = msg->send.base.nm_so; 750 int flags = msg->send.nm_flags; 751 struct mbuf *m = msg->send.nm_m; 752 int error = 0; 753 struct inpcb *inp; 754 struct tcpcb *tp; 755 TCPDEBUG0; 756 757 KKASSERT(msg->send.nm_control == NULL); 758 KKASSERT(msg->send.nm_addr == NULL); 759 KKASSERT((flags & PRUS_FREEADDR) == 0); 760 761 inp = so->so_pcb; 762 763 if (inp == NULL) { 764 /* 765 * OOPS! we lost a race, the TCP session got reset after 766 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a 767 * network interrupt in the non-critical section of sosend(). 768 */ 769 m_freem(m); 770 error = ECONNRESET; /* XXX EPIPE? */ 771 tp = NULL; 772 TCPDEBUG1(); 773 goto out; 774 } 775 tp = intotcpcb(inp); 776 TCPDEBUG1(); 777 778 #ifdef foo 779 /* 780 * This is no longer necessary, since: 781 * - sosendtcp() has already checked it for us 782 * - It does not work with asynchronized send 783 */ 784 785 /* 786 * Don't let too much OOB data build up 787 */ 788 if (flags & PRUS_OOB) { 789 if (ssb_space(&so->so_snd) < -512) { 790 m_freem(m); 791 error = ENOBUFS; 792 goto out; 793 } 794 } 795 #endif 796 797 /* 798 * Pump the data into the socket. 799 */ 800 if (m) { 801 ssb_appendstream(&so->so_snd, m); 802 sowwakeup(so); 803 } 804 if (flags & PRUS_OOB) { 805 /* 806 * According to RFC961 (Assigned Protocols), 807 * the urgent pointer points to the last octet 808 * of urgent data. We continue, however, 809 * to consider it to indicate the first octet 810 * of data past the urgent section. 811 * Otherwise, snd_up should be one lower. 812 */ 813 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 814 tp->t_flags |= TF_FORCE; 815 error = tcp_output(tp); 816 tp->t_flags &= ~TF_FORCE; 817 } else { 818 if (flags & PRUS_EOF) { 819 /* 820 * Close the send side of the connection after 821 * the data is sent. 822 */ 823 socantsendmore(so); 824 tp = tcp_usrclosed(tp); 825 } 826 if (tp != NULL && !tcp_output_pending(tp)) { 827 if (flags & PRUS_MORETOCOME) 828 tp->t_flags |= TF_MORETOCOME; 829 error = tcp_output_fair(tp); 830 if (flags & PRUS_MORETOCOME) 831 tp->t_flags &= ~TF_MORETOCOME; 832 } 833 } 834 COMMON_END1((flags & PRUS_OOB) ? PRU_SENDOOB : 835 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND), 836 (flags & PRUS_NOREPLY)); 837 } 838 839 /* 840 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort() 841 * will sofree() it when we return. 842 */ 843 static void 844 tcp_usr_abort(netmsg_t msg) 845 { 846 struct socket *so = msg->abort.base.nm_so; 847 int error = 0; 848 struct inpcb *inp; 849 struct tcpcb *tp; 850 851 COMMON_START(so, inp, 1); 852 tp = tcp_drop(tp, ECONNABORTED); 853 COMMON_END(PRU_ABORT); 854 } 855 856 /* 857 * Receive out-of-band data. 858 */ 859 static void 860 tcp_usr_rcvoob(netmsg_t msg) 861 { 862 struct socket *so = msg->rcvoob.base.nm_so; 863 struct mbuf *m = msg->rcvoob.nm_m; 864 int flags = msg->rcvoob.nm_flags; 865 int error = 0; 866 struct inpcb *inp; 867 struct tcpcb *tp; 868 869 COMMON_START(so, inp, 0); 870 if ((so->so_oobmark == 0 && 871 (so->so_state & SS_RCVATMARK) == 0) || 872 so->so_options & SO_OOBINLINE || 873 tp->t_oobflags & TCPOOB_HADDATA) { 874 error = EINVAL; 875 goto out; 876 } 877 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 878 error = EWOULDBLOCK; 879 goto out; 880 } 881 m->m_len = 1; 882 *mtod(m, caddr_t) = tp->t_iobc; 883 if ((flags & MSG_PEEK) == 0) 884 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 885 COMMON_END(PRU_RCVOOB); 886 } 887 888 static void 889 tcp_usr_savefaddr(struct socket *so, const struct sockaddr *faddr) 890 { 891 in_savefaddr(so, faddr); 892 } 893 894 #ifdef INET6 895 static void 896 tcp6_usr_savefaddr(struct socket *so, const struct sockaddr *faddr) 897 { 898 in6_mapped_savefaddr(so, faddr); 899 } 900 #endif 901 902 static int 903 tcp_usr_preconnect(struct socket *so, const struct sockaddr *nam, 904 struct thread *td __unused) 905 { 906 const struct sockaddr_in *sinp; 907 908 sinp = (const struct sockaddr_in *)nam; 909 if (sinp->sin_family == AF_INET && 910 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 911 return EAFNOSUPPORT; 912 913 soisconnecting(so); 914 return 0; 915 } 916 917 /* xxx - should be const */ 918 struct pr_usrreqs tcp_usrreqs = { 919 .pru_abort = tcp_usr_abort, 920 .pru_accept = tcp_usr_accept, 921 .pru_attach = tcp_usr_attach, 922 .pru_bind = tcp_usr_bind, 923 .pru_connect = tcp_usr_connect, 924 .pru_connect2 = pr_generic_notsupp, 925 .pru_control = in_control_dispatch, 926 .pru_detach = tcp_usr_detach, 927 .pru_disconnect = tcp_usr_disconnect, 928 .pru_listen = tcp_usr_listen, 929 .pru_peeraddr = in_setpeeraddr_dispatch, 930 .pru_rcvd = tcp_usr_rcvd, 931 .pru_rcvoob = tcp_usr_rcvoob, 932 .pru_send = tcp_usr_send, 933 .pru_sense = pru_sense_null, 934 .pru_shutdown = tcp_usr_shutdown, 935 .pru_sockaddr = in_setsockaddr_dispatch, 936 .pru_sosend = sosendtcp, 937 .pru_soreceive = sorecvtcp, 938 .pru_savefaddr = tcp_usr_savefaddr, 939 .pru_preconnect = tcp_usr_preconnect 940 }; 941 942 #ifdef INET6 943 struct pr_usrreqs tcp6_usrreqs = { 944 .pru_abort = tcp_usr_abort, 945 .pru_accept = tcp6_usr_accept, 946 .pru_attach = tcp_usr_attach, 947 .pru_bind = tcp6_usr_bind, 948 .pru_connect = tcp6_usr_connect, 949 .pru_connect2 = pr_generic_notsupp, 950 .pru_control = in6_control_dispatch, 951 .pru_detach = tcp_usr_detach, 952 .pru_disconnect = tcp_usr_disconnect, 953 .pru_listen = tcp6_usr_listen, 954 .pru_peeraddr = in6_mapped_peeraddr_dispatch, 955 .pru_rcvd = tcp_usr_rcvd, 956 .pru_rcvoob = tcp_usr_rcvoob, 957 .pru_send = tcp_usr_send, 958 .pru_sense = pru_sense_null, 959 .pru_shutdown = tcp_usr_shutdown, 960 .pru_sockaddr = in6_mapped_sockaddr_dispatch, 961 .pru_sosend = sosendtcp, 962 .pru_soreceive = sorecvtcp, 963 .pru_savefaddr = tcp6_usr_savefaddr 964 }; 965 #endif /* INET6 */ 966 967 static int 968 tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m, 969 struct sockaddr_in *sin, struct sockaddr_in *if_sin) 970 { 971 struct inpcb *inp = tp->t_inpcb, *oinp; 972 struct socket *so = inp->inp_socket; 973 struct route *ro = &inp->inp_route; 974 975 KASSERT(inp->inp_pcbinfo == &tcbinfo[mycpu->gd_cpuid], 976 ("pcbinfo mismatch")); 977 978 oinp = in_pcblookup_hash(inp->inp_pcbinfo, 979 sin->sin_addr, sin->sin_port, 980 (inp->inp_laddr.s_addr != INADDR_ANY ? 981 inp->inp_laddr : if_sin->sin_addr), 982 inp->inp_lport, 0, NULL); 983 if (oinp != NULL) { 984 m_freem(m); 985 return (EADDRINUSE); 986 } 987 if (inp->inp_laddr.s_addr == INADDR_ANY) 988 inp->inp_laddr = if_sin->sin_addr; 989 inp->inp_faddr = sin->sin_addr; 990 inp->inp_fport = sin->sin_port; 991 in_pcbinsconnhash(inp); 992 993 /* 994 * We are now on the inpcb's owner CPU, if the cached route was 995 * freed because the rtentry's owner CPU is not the current CPU 996 * (e.g. in tcp_connect()), then we try to reallocate it here with 997 * the hope that a rtentry may be cloned from a RTF_PRCLONING 998 * rtentry. 999 */ 1000 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/ 1001 ro->ro_rt == NULL) { 1002 bzero(&ro->ro_dst, sizeof(struct sockaddr_in)); 1003 ro->ro_dst.sa_family = AF_INET; 1004 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 1005 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = 1006 sin->sin_addr; 1007 rtalloc(ro); 1008 } 1009 1010 /* 1011 * Now that no more errors can occur, change the protocol processing 1012 * port to the current thread (which is the correct thread). 1013 * 1014 * Create TCP timer message now; we are on the tcpcb's owner 1015 * CPU/thread. 1016 */ 1017 tcp_create_timermsg(tp, &curthread->td_msgport); 1018 1019 /* 1020 * Compute window scaling to request. Use a larger scaling then 1021 * needed for the initial receive buffer in case the receive buffer 1022 * gets expanded. 1023 */ 1024 if (tp->request_r_scale < TCP_MIN_WINSHIFT) 1025 tp->request_r_scale = TCP_MIN_WINSHIFT; 1026 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1027 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat 1028 ) { 1029 tp->request_r_scale++; 1030 } 1031 1032 soisconnecting(so); 1033 tcpstat.tcps_connattempt++; 1034 tp->t_state = TCPS_SYN_SENT; 1035 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep); 1036 tp->iss = tcp_new_isn(tp); 1037 tcp_sendseqinit(tp); 1038 if (m) { 1039 ssb_appendstream(&so->so_snd, m); 1040 m = NULL; 1041 if (flags & PRUS_OOB) 1042 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 1043 } 1044 1045 /* 1046 * Close the send side of the connection after 1047 * the data is sent if flagged. 1048 */ 1049 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) { 1050 socantsendmore(so); 1051 tp = tcp_usrclosed(tp); 1052 } 1053 return (tcp_output(tp)); 1054 } 1055 1056 /* 1057 * Common subroutine to open a TCP connection to remote host specified 1058 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1059 * port number if needed. Call in_pcbladdr to do the routing and to choose 1060 * a local host address (interface). 1061 * Initialize connection parameters and enter SYN-SENT state. 1062 */ 1063 static void 1064 tcp_connect(netmsg_t msg) 1065 { 1066 struct socket *so = msg->connect.base.nm_so; 1067 struct sockaddr *nam = msg->connect.nm_nam; 1068 struct thread *td = msg->connect.nm_td; 1069 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 1070 struct sockaddr_in *if_sin = NULL; 1071 struct inpcb *inp; 1072 struct tcpcb *tp; 1073 int error; 1074 lwkt_port_t port; 1075 1076 COMMON_START(so, inp, 0); 1077 1078 /* 1079 * Reconnect our pcb if we have to 1080 */ 1081 if (msg->connect.nm_flags & PRUC_RECONNECT) { 1082 msg->connect.nm_flags &= ~PRUC_RECONNECT; 1083 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1084 } 1085 1086 /* 1087 * Bind if we have to 1088 */ 1089 if (inp->inp_lport == 0) { 1090 if (tcp_lport_extension) { 1091 KKASSERT(inp->inp_laddr.s_addr == INADDR_ANY); 1092 1093 error = in_pcbladdr(inp, nam, &if_sin, td); 1094 if (error) 1095 goto out; 1096 inp->inp_laddr.s_addr = if_sin->sin_addr.s_addr; 1097 1098 error = in_pcbbind_remote(inp, nam, td); 1099 if (error) 1100 goto out; 1101 1102 msg->connect.nm_flags |= PRUC_HASLADDR; 1103 } else { 1104 error = in_pcbbind(inp, NULL, td); 1105 if (error) 1106 goto out; 1107 } 1108 } 1109 1110 if ((msg->connect.nm_flags & PRUC_HASLADDR) == 0) { 1111 /* 1112 * Calculate the correct protocol processing thread. The 1113 * connect operation must run there. Set the forwarding 1114 * port before we forward the message or it will get bounced 1115 * right back to us. 1116 */ 1117 error = in_pcbladdr(inp, nam, &if_sin, td); 1118 if (error) 1119 goto out; 1120 } 1121 KKASSERT(inp->inp_socket == so); 1122 1123 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port, 1124 (inp->inp_laddr.s_addr != INADDR_ANY ? 1125 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr), 1126 inp->inp_lport); 1127 1128 if (port != &curthread->td_msgport) { 1129 lwkt_msg_t lmsg = &msg->connect.base.lmsg; 1130 1131 /* 1132 * in_pcbladdr() may have allocated a route entry for us 1133 * on the current CPU, but we need a route entry on the 1134 * inpcb's owner CPU, so free it here. 1135 */ 1136 in_pcbresetroute(inp); 1137 1138 /* 1139 * We are moving the protocol processing port the socket 1140 * is on, we have to unlink here and re-link on the 1141 * target cpu. 1142 */ 1143 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1144 msg->connect.nm_flags |= PRUC_RECONNECT; 1145 msg->connect.base.nm_dispatch = tcp_connect; 1146 1147 /* 1148 * Use message put done receipt to change this socket's 1149 * so_port, i.e. _after_ this message was put onto the 1150 * target netisr's msgport but _before_ the message could 1151 * be pulled from the target netisr's msgport, so that: 1152 * - The upper half (socket code) will not see the new 1153 * msgport before this message reaches the new msgport 1154 * and messages for this socket will be ordered. 1155 * - This message will see the new msgport, when its 1156 * handler is called in the target netisr. 1157 * 1158 * NOTE: 1159 * We MUST use messege put done receipt to change this 1160 * socket's so_port: 1161 * If we changed the so_port in this netisr after the 1162 * lwkt_forwardmsg (so messages for this socket will be 1163 * ordered) and changed the so_port in the target netisr 1164 * at the very beginning of this message's handler, we 1165 * would suffer so_port overwritten race, given this 1166 * message might be forwarded again. 1167 * 1168 * NOTE: 1169 * This mechanism depends on that the netisr's msgport 1170 * is spin msgport (currently it is :). 1171 * 1172 * If the upper half saw the new msgport before this 1173 * message reached the target netisr's msgport, the 1174 * messages sent from the upper half could reach the new 1175 * msgport before this message, thus there would be 1176 * message reordering. The worst case could be soclose() 1177 * saw the new msgport and the detach message could reach 1178 * the new msgport before this message, i.e. the inpcb 1179 * could have been destroyed when this message was still 1180 * pending on or on its way to the new msgport. Other 1181 * weird cases could also happen, e.g. inpcb->inp_pcbinfo, 1182 * since we have unlinked this inpcb from the current 1183 * pcbinfo first. 1184 */ 1185 lwkt_setmsg_receipt(lmsg, tcp_sosetport); 1186 lwkt_forwardmsg(port, lmsg); 1187 /* msg invalid now */ 1188 return; 1189 } else if (msg->connect.nm_flags & PRUC_HELDTD) { 1190 /* 1191 * The original thread is no longer needed; release it. 1192 */ 1193 lwkt_rele(td); 1194 msg->connect.nm_flags &= ~PRUC_HELDTD; 1195 } 1196 error = tcp_connect_oncpu(tp, msg->connect.nm_sndflags, 1197 msg->connect.nm_m, sin, if_sin); 1198 msg->connect.nm_m = NULL; 1199 out: 1200 if (msg->connect.nm_m) { 1201 m_freem(msg->connect.nm_m); 1202 msg->connect.nm_m = NULL; 1203 } 1204 if (msg->connect.nm_flags & PRUC_NAMALLOC) { 1205 kfree(msg->connect.nm_nam, M_LWKTMSG); 1206 msg->connect.nm_nam = NULL; 1207 } 1208 if (msg->connect.nm_flags & PRUC_HELDTD) 1209 lwkt_rele(td); 1210 if (error && (msg->connect.nm_flags & PRUC_ASYNC)) { 1211 so->so_error = error; 1212 soisdisconnected(so); 1213 } 1214 lwkt_replymsg(&msg->connect.base.lmsg, error); 1215 /* msg invalid now */ 1216 } 1217 1218 #ifdef INET6 1219 1220 static void 1221 tcp6_connect(netmsg_t msg) 1222 { 1223 struct tcpcb *tp; 1224 struct socket *so = msg->connect.base.nm_so; 1225 struct sockaddr *nam = msg->connect.nm_nam; 1226 struct thread *td = msg->connect.nm_td; 1227 struct inpcb *inp; 1228 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 1229 struct in6_addr *addr6; 1230 lwkt_port_t port; 1231 int error; 1232 1233 COMMON_START(so, inp, 0); 1234 1235 /* 1236 * Reconnect our pcb if we have to 1237 */ 1238 if (msg->connect.nm_flags & PRUC_RECONNECT) { 1239 msg->connect.nm_flags &= ~PRUC_RECONNECT; 1240 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1241 } 1242 1243 /* 1244 * Bind if we have to 1245 */ 1246 if (inp->inp_lport == 0) { 1247 error = in6_pcbbind(inp, NULL, td); 1248 if (error) 1249 goto out; 1250 } 1251 1252 /* 1253 * Cannot simply call in_pcbconnect, because there might be an 1254 * earlier incarnation of this same connection still in 1255 * TIME_WAIT state, creating an ADDRINUSE error. 1256 */ 1257 error = in6_pcbladdr(inp, nam, &addr6, td); 1258 if (error) 1259 goto out; 1260 1261 port = tcp6_addrport(); /* XXX hack for now, always cpu0 */ 1262 1263 if (port != &curthread->td_msgport) { 1264 lwkt_msg_t lmsg = &msg->connect.base.lmsg; 1265 1266 /* 1267 * in_pcbladdr() may have allocated a route entry for us 1268 * on the current CPU, but we need a route entry on the 1269 * inpcb's owner CPU, so free it here. 1270 */ 1271 in_pcbresetroute(inp); 1272 1273 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1274 msg->connect.nm_flags |= PRUC_RECONNECT; 1275 msg->connect.base.nm_dispatch = tcp6_connect; 1276 1277 /* See the related comment in tcp_connect() */ 1278 lwkt_setmsg_receipt(lmsg, tcp_sosetport); 1279 lwkt_forwardmsg(port, lmsg); 1280 /* msg invalid now */ 1281 return; 1282 } 1283 error = tcp6_connect_oncpu(tp, msg->connect.nm_sndflags, 1284 &msg->connect.nm_m, sin6, addr6); 1285 /* nm_m may still be intact */ 1286 out: 1287 if (error && (msg->connect.nm_flags & PRUC_FALLBACK)) { 1288 tcp_connect(msg); 1289 /* msg invalid now */ 1290 } else { 1291 if (msg->connect.nm_m) { 1292 m_freem(msg->connect.nm_m); 1293 msg->connect.nm_m = NULL; 1294 } 1295 if (msg->connect.nm_flags & PRUC_NAMALLOC) { 1296 kfree(msg->connect.nm_nam, M_LWKTMSG); 1297 msg->connect.nm_nam = NULL; 1298 } 1299 lwkt_replymsg(&msg->connect.base.lmsg, error); 1300 /* msg invalid now */ 1301 } 1302 } 1303 1304 static int 1305 tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp, 1306 struct sockaddr_in6 *sin6, struct in6_addr *addr6) 1307 { 1308 struct mbuf *m = *mp; 1309 struct inpcb *inp = tp->t_inpcb; 1310 struct socket *so = inp->inp_socket; 1311 struct inpcb *oinp; 1312 1313 /* 1314 * Cannot simply call in_pcbconnect, because there might be an 1315 * earlier incarnation of this same connection still in 1316 * TIME_WAIT state, creating an ADDRINUSE error. 1317 */ 1318 oinp = in6_pcblookup_hash(inp->inp_pcbinfo, 1319 &sin6->sin6_addr, sin6->sin6_port, 1320 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ? 1321 addr6 : &inp->in6p_laddr), 1322 inp->inp_lport, 0, NULL); 1323 if (oinp) 1324 return (EADDRINUSE); 1325 1326 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1327 inp->in6p_laddr = *addr6; 1328 inp->in6p_faddr = sin6->sin6_addr; 1329 inp->inp_fport = sin6->sin6_port; 1330 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0) 1331 inp->in6p_flowinfo = sin6->sin6_flowinfo; 1332 in_pcbinsconnhash(inp); 1333 1334 /* 1335 * Now that no more errors can occur, change the protocol processing 1336 * port to the current thread (which is the correct thread). 1337 * 1338 * Create TCP timer message now; we are on the tcpcb's owner 1339 * CPU/thread. 1340 */ 1341 tcp_create_timermsg(tp, &curthread->td_msgport); 1342 1343 /* Compute window scaling to request. */ 1344 if (tp->request_r_scale < TCP_MIN_WINSHIFT) 1345 tp->request_r_scale = TCP_MIN_WINSHIFT; 1346 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1347 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) { 1348 tp->request_r_scale++; 1349 } 1350 1351 soisconnecting(so); 1352 tcpstat.tcps_connattempt++; 1353 tp->t_state = TCPS_SYN_SENT; 1354 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep); 1355 tp->iss = tcp_new_isn(tp); 1356 tcp_sendseqinit(tp); 1357 if (m) { 1358 ssb_appendstream(&so->so_snd, m); 1359 *mp = NULL; 1360 if (flags & PRUS_OOB) 1361 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 1362 } 1363 1364 /* 1365 * Close the send side of the connection after 1366 * the data is sent if flagged. 1367 */ 1368 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) { 1369 socantsendmore(so); 1370 tp = tcp_usrclosed(tp); 1371 } 1372 return (tcp_output(tp)); 1373 } 1374 1375 #endif /* INET6 */ 1376 1377 /* 1378 * The new sockopt interface makes it possible for us to block in the 1379 * copyin/out step (if we take a page fault). Taking a page fault while 1380 * in a critical section is probably a Bad Thing. (Since sockets and pcbs 1381 * both now use TSM, there probably isn't any need for this function to 1382 * run in a critical section any more. This needs more examination.) 1383 */ 1384 void 1385 tcp_ctloutput(netmsg_t msg) 1386 { 1387 struct socket *so = msg->base.nm_so; 1388 struct sockopt *sopt = msg->ctloutput.nm_sopt; 1389 int error, opt, optval, opthz; 1390 struct inpcb *inp; 1391 struct tcpcb *tp; 1392 1393 error = 0; 1394 inp = so->so_pcb; 1395 if (inp == NULL) { 1396 error = ECONNRESET; 1397 goto done; 1398 } 1399 tp = intotcpcb(inp); 1400 1401 /* Get socket's owner cpuid hint */ 1402 if (sopt->sopt_level == SOL_SOCKET && 1403 sopt->sopt_dir == SOPT_GET && 1404 sopt->sopt_name == SO_CPUHINT) { 1405 if (tp->t_flags & TF_LISTEN) { 1406 /* 1407 * Listen sockets owner cpuid is always 0, 1408 * which does not make sense if SO_REUSEPORT 1409 * is not set. 1410 */ 1411 if (so->so_options & SO_REUSEPORT) 1412 optval = (inp->inp_lgrpindex & ncpus2_mask); 1413 else 1414 optval = -1; /* no hint */ 1415 } else { 1416 optval = mycpuid; 1417 } 1418 soopt_from_kbuf(sopt, &optval, sizeof(optval)); 1419 goto done; 1420 } 1421 1422 if (sopt->sopt_level != IPPROTO_TCP) { 1423 if (sopt->sopt_level == IPPROTO_IP) { 1424 switch (sopt->sopt_name) { 1425 case IP_MULTICAST_IF: 1426 case IP_MULTICAST_VIF: 1427 case IP_MULTICAST_TTL: 1428 case IP_MULTICAST_LOOP: 1429 case IP_ADD_MEMBERSHIP: 1430 case IP_DROP_MEMBERSHIP: 1431 /* 1432 * Multicast does not make sense on 1433 * TCP sockets. 1434 */ 1435 error = EOPNOTSUPP; 1436 goto done; 1437 } 1438 } 1439 #ifdef INET6 1440 if (INP_CHECK_SOCKAF(so, AF_INET6)) 1441 ip6_ctloutput_dispatch(msg); 1442 else 1443 #endif /* INET6 */ 1444 ip_ctloutput(msg); 1445 /* msg invalid now */ 1446 return; 1447 } 1448 1449 switch (sopt->sopt_dir) { 1450 case SOPT_SET: 1451 error = soopt_to_kbuf(sopt, &optval, sizeof optval, 1452 sizeof optval); 1453 if (error) 1454 break; 1455 switch (sopt->sopt_name) { 1456 case TCP_FASTKEEP: 1457 if (optval > 0) 1458 tp->t_keepidle = tp->t_keepintvl; 1459 else 1460 tp->t_keepidle = tcp_keepidle; 1461 tcp_timer_keep_activity(tp, 0); 1462 break; 1463 #ifdef TCP_SIGNATURE 1464 case TCP_SIGNATURE_ENABLE: 1465 if (tp->t_state == TCPS_CLOSED) { 1466 /* 1467 * This is the only safe state that this 1468 * option could be changed. Some segments 1469 * could already have been sent in other 1470 * states. 1471 */ 1472 if (optval > 0) 1473 tp->t_flags |= TF_SIGNATURE; 1474 else 1475 tp->t_flags &= ~TF_SIGNATURE; 1476 } else { 1477 error = EOPNOTSUPP; 1478 } 1479 break; 1480 #endif /* TCP_SIGNATURE */ 1481 case TCP_NODELAY: 1482 case TCP_NOOPT: 1483 switch (sopt->sopt_name) { 1484 case TCP_NODELAY: 1485 opt = TF_NODELAY; 1486 break; 1487 case TCP_NOOPT: 1488 opt = TF_NOOPT; 1489 break; 1490 default: 1491 opt = 0; /* dead code to fool gcc */ 1492 break; 1493 } 1494 1495 if (optval) 1496 tp->t_flags |= opt; 1497 else 1498 tp->t_flags &= ~opt; 1499 break; 1500 1501 case TCP_NOPUSH: 1502 if (tcp_disable_nopush) 1503 break; 1504 if (optval) 1505 tp->t_flags |= TF_NOPUSH; 1506 else { 1507 tp->t_flags &= ~TF_NOPUSH; 1508 error = tcp_output(tp); 1509 } 1510 break; 1511 1512 case TCP_MAXSEG: 1513 /* 1514 * Must be between 0 and maxseg. If the requested 1515 * maxseg is too small to satisfy the desired minmss, 1516 * pump it up (silently so sysctl modifications of 1517 * minmss do not create unexpected program failures). 1518 * Handle degenerate cases. 1519 */ 1520 if (optval > 0 && optval <= tp->t_maxseg) { 1521 if (optval + 40 < tcp_minmss) { 1522 optval = tcp_minmss - 40; 1523 if (optval < 0) 1524 optval = 1; 1525 } 1526 tp->t_maxseg = optval; 1527 } else { 1528 error = EINVAL; 1529 } 1530 break; 1531 1532 case TCP_KEEPINIT: 1533 opthz = ((int64_t)optval * hz) / 1000; 1534 if (opthz >= 1) 1535 tp->t_keepinit = opthz; 1536 else 1537 error = EINVAL; 1538 break; 1539 1540 case TCP_KEEPIDLE: 1541 opthz = ((int64_t)optval * hz) / 1000; 1542 if (opthz >= 1) { 1543 tp->t_keepidle = opthz; 1544 tcp_timer_keep_activity(tp, 0); 1545 } else { 1546 error = EINVAL; 1547 } 1548 break; 1549 1550 case TCP_KEEPINTVL: 1551 opthz = ((int64_t)optval * hz) / 1000; 1552 if (opthz >= 1) { 1553 tp->t_keepintvl = opthz; 1554 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt; 1555 } else { 1556 error = EINVAL; 1557 } 1558 break; 1559 1560 case TCP_KEEPCNT: 1561 if (optval > 0) { 1562 tp->t_keepcnt = optval; 1563 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt; 1564 } else { 1565 error = EINVAL; 1566 } 1567 break; 1568 1569 default: 1570 error = ENOPROTOOPT; 1571 break; 1572 } 1573 break; 1574 1575 case SOPT_GET: 1576 switch (sopt->sopt_name) { 1577 #ifdef TCP_SIGNATURE 1578 case TCP_SIGNATURE_ENABLE: 1579 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; 1580 break; 1581 #endif /* TCP_SIGNATURE */ 1582 case TCP_NODELAY: 1583 optval = tp->t_flags & TF_NODELAY; 1584 break; 1585 case TCP_MAXSEG: 1586 optval = tp->t_maxseg; 1587 break; 1588 case TCP_NOOPT: 1589 optval = tp->t_flags & TF_NOOPT; 1590 break; 1591 case TCP_NOPUSH: 1592 optval = tp->t_flags & TF_NOPUSH; 1593 break; 1594 case TCP_KEEPINIT: 1595 optval = ((int64_t)tp->t_keepinit * 1000) / hz; 1596 break; 1597 case TCP_KEEPIDLE: 1598 optval = ((int64_t)tp->t_keepidle * 1000) / hz; 1599 break; 1600 case TCP_KEEPINTVL: 1601 optval = ((int64_t)tp->t_keepintvl * 1000) / hz; 1602 break; 1603 case TCP_KEEPCNT: 1604 optval = tp->t_keepcnt; 1605 break; 1606 default: 1607 error = ENOPROTOOPT; 1608 break; 1609 } 1610 if (error == 0) 1611 soopt_from_kbuf(sopt, &optval, sizeof optval); 1612 break; 1613 } 1614 done: 1615 lwkt_replymsg(&msg->lmsg, error); 1616 } 1617 1618 /* 1619 * tcp_sendspace and tcp_recvspace are the default send and receive window 1620 * sizes, respectively. These are obsolescent (this information should 1621 * be set by the route). 1622 * 1623 * Use a default that does not require tcp window scaling to be turned 1624 * on. Individual programs or the administrator can increase the default. 1625 */ 1626 u_long tcp_sendspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ 1627 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, 1628 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); 1629 u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ 1630 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 1631 &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); 1632 1633 /* 1634 * Attach TCP protocol to socket, allocating internet protocol control 1635 * block, tcp control block, buffer space, and entering CLOSED state. 1636 */ 1637 static int 1638 tcp_attach(struct socket *so, struct pru_attach_info *ai) 1639 { 1640 struct tcpcb *tp; 1641 struct inpcb *inp; 1642 int error; 1643 int cpu; 1644 #ifdef INET6 1645 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0; 1646 #endif 1647 1648 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) { 1649 lwkt_gettoken(&so->so_rcv.ssb_token); 1650 error = soreserve(so, tcp_sendspace, tcp_recvspace, 1651 ai->sb_rlimit); 1652 lwkt_reltoken(&so->so_rcv.ssb_token); 1653 if (error) 1654 return (error); 1655 } 1656 atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE | SSB_PREALLOC); 1657 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE | SSB_PREALLOC); 1658 cpu = mycpu->gd_cpuid; 1659 1660 /* 1661 * Set the default port for protocol processing. This will likely 1662 * change when we connect. 1663 */ 1664 error = in_pcballoc(so, &tcbinfo[cpu]); 1665 if (error) 1666 return (error); 1667 inp = so->so_pcb; 1668 #ifdef INET6 1669 if (isipv6) { 1670 inp->inp_vflag |= INP_IPV6; 1671 inp->in6p_hops = -1; /* use kernel default */ 1672 } 1673 else 1674 #endif 1675 inp->inp_vflag |= INP_IPV4; 1676 tp = tcp_newtcpcb(inp); 1677 if (tp == NULL) { 1678 /* 1679 * Make sure the socket is destroyed by the pcbdetach. 1680 */ 1681 soreference(so); 1682 #ifdef INET6 1683 if (isipv6) 1684 in6_pcbdetach(inp); 1685 else 1686 #endif 1687 in_pcbdetach(inp); 1688 sofree(so); /* from ref above */ 1689 return (ENOBUFS); 1690 } 1691 tp->t_state = TCPS_CLOSED; 1692 /* Keep a reference for asynchronized pru_rcvd */ 1693 soreference(so); 1694 return (0); 1695 } 1696 1697 /* 1698 * Initiate (or continue) disconnect. 1699 * If embryonic state, just send reset (once). 1700 * If in ``let data drain'' option and linger null, just drop. 1701 * Otherwise (hard), mark socket disconnecting and drop 1702 * current input data; switch states based on user close, and 1703 * send segment to peer (with FIN). 1704 */ 1705 static struct tcpcb * 1706 tcp_disconnect(struct tcpcb *tp) 1707 { 1708 struct socket *so = tp->t_inpcb->inp_socket; 1709 1710 if (tp->t_state < TCPS_ESTABLISHED) { 1711 tp = tcp_close(tp); 1712 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1713 tp = tcp_drop(tp, 0); 1714 } else { 1715 lwkt_gettoken(&so->so_rcv.ssb_token); 1716 soisdisconnecting(so); 1717 sbflush(&so->so_rcv.sb); 1718 tp = tcp_usrclosed(tp); 1719 if (tp) 1720 tcp_output(tp); 1721 lwkt_reltoken(&so->so_rcv.ssb_token); 1722 } 1723 return (tp); 1724 } 1725 1726 /* 1727 * User issued close, and wish to trail through shutdown states: 1728 * if never received SYN, just forget it. If got a SYN from peer, 1729 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1730 * If already got a FIN from peer, then almost done; go to LAST_ACK 1731 * state. In all other cases, have already sent FIN to peer (e.g. 1732 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1733 * for peer to send FIN or not respond to keep-alives, etc. 1734 * We can let the user exit from the close as soon as the FIN is acked. 1735 */ 1736 static struct tcpcb * 1737 tcp_usrclosed(struct tcpcb *tp) 1738 { 1739 1740 switch (tp->t_state) { 1741 1742 case TCPS_CLOSED: 1743 case TCPS_LISTEN: 1744 tp->t_state = TCPS_CLOSED; 1745 tp = tcp_close(tp); 1746 break; 1747 1748 case TCPS_SYN_SENT: 1749 case TCPS_SYN_RECEIVED: 1750 tp->t_flags |= TF_NEEDFIN; 1751 break; 1752 1753 case TCPS_ESTABLISHED: 1754 tp->t_state = TCPS_FIN_WAIT_1; 1755 break; 1756 1757 case TCPS_CLOSE_WAIT: 1758 tp->t_state = TCPS_LAST_ACK; 1759 break; 1760 } 1761 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) { 1762 soisdisconnected(tp->t_inpcb->inp_socket); 1763 /* To prevent the connection hanging in FIN_WAIT_2 forever. */ 1764 if (tp->t_state == TCPS_FIN_WAIT_2) { 1765 tcp_callout_reset(tp, tp->tt_2msl, tp->t_maxidle, 1766 tcp_timer_2msl); 1767 } 1768 } 1769 return (tp); 1770 } 1771