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