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