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 * 4. 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; 389 390 COMMON_START(so, inp, 0); 391 392 if (tp->t_flags & TF_LISTEN) 393 goto out; 394 395 if (inp->inp_lport == 0) { 396 error = in_pcbbind(inp, NULL, td); 397 if (error) 398 goto out; 399 } 400 401 tp->t_state = TCPS_LISTEN; 402 tp->t_flags |= TF_LISTEN; 403 tp->tt_msg = NULL; /* Catch any invalid timer usage */ 404 405 if (ncpus > 1) { 406 /* 407 * We have to set the flag because we can't have other cpus 408 * messing with our inp's flags. 409 */ 410 KASSERT(!(inp->inp_flags & INP_CONNECTED), 411 ("already on connhash")); 412 KASSERT(!(inp->inp_flags & INP_WILDCARD), 413 ("already on wildcardhash")); 414 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP), 415 ("already on MP wildcardhash")); 416 inp->inp_flags |= INP_WILDCARD_MP; 417 418 KKASSERT(so->so_port == netisr_cpuport(0)); 419 KKASSERT(&curthread->td_msgport == netisr_cpuport(0)); 420 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]); 421 422 netmsg_init(&nm.base, NULL, &curthread->td_msgport, 423 MSGF_PRIORITY, in_pcbinswildcardhash_handler); 424 nm.nm_inp = inp; 425 lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0); 426 } 427 in_pcbinswildcardhash(inp); 428 COMMON_END(PRU_LISTEN); 429 } 430 431 #ifdef INET6 432 433 static void 434 tcp6_usr_listen(netmsg_t msg) 435 { 436 struct socket *so = msg->listen.base.nm_so; 437 struct thread *td = msg->listen.nm_td; 438 int error = 0; 439 struct inpcb *inp; 440 struct tcpcb *tp; 441 struct netmsg_inswildcard nm; 442 443 COMMON_START(so, inp, 0); 444 445 if (tp->t_flags & TF_LISTEN) 446 goto out; 447 448 if (inp->inp_lport == 0) { 449 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) 450 inp->inp_vflag |= INP_IPV4; 451 else 452 inp->inp_vflag &= ~INP_IPV4; 453 error = in6_pcbbind(inp, NULL, td); 454 if (error) 455 goto out; 456 } 457 458 tp->t_state = TCPS_LISTEN; 459 tp->t_flags |= TF_LISTEN; 460 tp->tt_msg = NULL; /* Catch any invalid timer usage */ 461 462 if (ncpus > 1) { 463 /* 464 * We have to set the flag because we can't have other cpus 465 * messing with our inp's flags. 466 */ 467 KASSERT(!(inp->inp_flags & INP_CONNECTED), 468 ("already on connhash")); 469 KASSERT(!(inp->inp_flags & INP_WILDCARD), 470 ("already on wildcardhash")); 471 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP), 472 ("already on MP wildcardhash")); 473 inp->inp_flags |= INP_WILDCARD_MP; 474 475 KKASSERT(so->so_port == netisr_cpuport(0)); 476 KKASSERT(&curthread->td_msgport == netisr_cpuport(0)); 477 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]); 478 479 netmsg_init(&nm.base, NULL, &curthread->td_msgport, 480 MSGF_PRIORITY, in_pcbinswildcardhash_handler); 481 nm.nm_inp = inp; 482 lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0); 483 } 484 in_pcbinswildcardhash(inp); 485 COMMON_END(PRU_LISTEN); 486 } 487 #endif /* INET6 */ 488 489 /* 490 * Initiate connection to peer. 491 * Create a template for use in transmissions on this connection. 492 * Enter SYN_SENT state, and mark socket as connecting. 493 * Start keep-alive timer, and seed output sequence space. 494 * Send initial segment on connection. 495 */ 496 static void 497 tcp_usr_connect(netmsg_t msg) 498 { 499 struct socket *so = msg->connect.base.nm_so; 500 struct sockaddr *nam = msg->connect.nm_nam; 501 struct thread *td = msg->connect.nm_td; 502 int error = 0; 503 struct inpcb *inp; 504 struct tcpcb *tp; 505 struct sockaddr_in *sinp; 506 507 COMMON_START(so, inp, 0); 508 509 /* 510 * Must disallow TCP ``connections'' to multicast addresses. 511 */ 512 sinp = (struct sockaddr_in *)nam; 513 if (sinp->sin_family == AF_INET 514 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 515 error = EAFNOSUPPORT; 516 goto out; 517 } 518 519 if (!prison_remote_ip(td, (struct sockaddr*)sinp)) { 520 error = EAFNOSUPPORT; /* IPv6 only jail */ 521 goto out; 522 } 523 524 tcp_connect(msg); 525 /* msg is invalid now */ 526 return; 527 out: 528 if (msg->connect.nm_m) { 529 m_freem(msg->connect.nm_m); 530 msg->connect.nm_m = NULL; 531 } 532 lwkt_replymsg(&msg->lmsg, error); 533 } 534 535 #ifdef INET6 536 537 static void 538 tcp6_usr_connect(netmsg_t msg) 539 { 540 struct socket *so = msg->connect.base.nm_so; 541 struct sockaddr *nam = msg->connect.nm_nam; 542 struct thread *td = msg->connect.nm_td; 543 int error = 0; 544 struct inpcb *inp; 545 struct tcpcb *tp; 546 struct sockaddr_in6 *sin6p; 547 548 COMMON_START(so, inp, 0); 549 550 /* 551 * Must disallow TCP ``connections'' to multicast addresses. 552 */ 553 sin6p = (struct sockaddr_in6 *)nam; 554 if (sin6p->sin6_family == AF_INET6 555 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 556 error = EAFNOSUPPORT; 557 goto out; 558 } 559 560 if (!prison_remote_ip(td, nam)) { 561 error = EAFNOSUPPORT; /* IPv4 only jail */ 562 goto out; 563 } 564 565 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 566 struct sockaddr_in *sinp; 567 568 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 569 error = EINVAL; 570 goto out; 571 } 572 sinp = kmalloc(sizeof(*sinp), M_LWKTMSG, M_INTWAIT); 573 in6_sin6_2_sin(sinp, sin6p); 574 inp->inp_vflag |= INP_IPV4; 575 inp->inp_vflag &= ~INP_IPV6; 576 msg->connect.nm_nam = (struct sockaddr *)sinp; 577 msg->connect.nm_reconnect |= NMSG_RECONNECT_NAMALLOC; 578 tcp_connect(msg); 579 /* msg is invalid now */ 580 return; 581 } 582 inp->inp_vflag &= ~INP_IPV4; 583 inp->inp_vflag |= INP_IPV6; 584 inp->inp_inc.inc_isipv6 = 1; 585 586 msg->connect.nm_reconnect |= NMSG_RECONNECT_FALLBACK; 587 tcp6_connect(msg); 588 /* msg is invalid now */ 589 return; 590 out: 591 if (msg->connect.nm_m) { 592 m_freem(msg->connect.nm_m); 593 msg->connect.nm_m = NULL; 594 } 595 lwkt_replymsg(&msg->lmsg, error); 596 } 597 598 #endif /* INET6 */ 599 600 /* 601 * Initiate disconnect from peer. 602 * If connection never passed embryonic stage, just drop; 603 * else if don't need to let data drain, then can just drop anyways, 604 * else have to begin TCP shutdown process: mark socket disconnecting, 605 * drain unread data, state switch to reflect user close, and 606 * send segment (e.g. FIN) to peer. Socket will be really disconnected 607 * when peer sends FIN and acks ours. 608 * 609 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 610 */ 611 static void 612 tcp_usr_disconnect(netmsg_t msg) 613 { 614 struct socket *so = msg->disconnect.base.nm_so; 615 int error = 0; 616 struct inpcb *inp; 617 struct tcpcb *tp; 618 619 COMMON_START(so, inp, 1); 620 tp = tcp_disconnect(tp); 621 COMMON_END(PRU_DISCONNECT); 622 } 623 624 /* 625 * Accept a connection. Essentially all the work is 626 * done at higher levels; just return the address 627 * of the peer, storing through addr. 628 */ 629 static void 630 tcp_usr_accept(netmsg_t msg) 631 { 632 struct socket *so = msg->accept.base.nm_so; 633 struct sockaddr **nam = msg->accept.nm_nam; 634 int error = 0; 635 struct inpcb *inp; 636 struct tcpcb *tp = NULL; 637 TCPDEBUG0; 638 639 inp = so->so_pcb; 640 if (so->so_state & SS_ISDISCONNECTED) { 641 error = ECONNABORTED; 642 goto out; 643 } 644 if (inp == 0) { 645 error = EINVAL; 646 goto out; 647 } 648 649 tp = intotcpcb(inp); 650 TCPDEBUG1(); 651 in_setpeeraddr(so, nam); 652 COMMON_END(PRU_ACCEPT); 653 } 654 655 #ifdef INET6 656 static void 657 tcp6_usr_accept(netmsg_t msg) 658 { 659 struct socket *so = msg->accept.base.nm_so; 660 struct sockaddr **nam = msg->accept.nm_nam; 661 int error = 0; 662 struct inpcb *inp; 663 struct tcpcb *tp = NULL; 664 TCPDEBUG0; 665 666 inp = so->so_pcb; 667 668 if (so->so_state & SS_ISDISCONNECTED) { 669 error = ECONNABORTED; 670 goto out; 671 } 672 if (inp == 0) { 673 error = EINVAL; 674 goto out; 675 } 676 tp = intotcpcb(inp); 677 TCPDEBUG1(); 678 in6_mapped_peeraddr(so, nam); 679 COMMON_END(PRU_ACCEPT); 680 } 681 #endif /* INET6 */ 682 /* 683 * Mark the connection as being incapable of further output. 684 */ 685 static void 686 tcp_usr_shutdown(netmsg_t msg) 687 { 688 struct socket *so = msg->shutdown.base.nm_so; 689 int error = 0; 690 struct inpcb *inp; 691 struct tcpcb *tp; 692 693 COMMON_START(so, inp, 0); 694 socantsendmore(so); 695 tp = tcp_usrclosed(tp); 696 if (tp) 697 error = tcp_output(tp); 698 COMMON_END(PRU_SHUTDOWN); 699 } 700 701 /* 702 * After a receive, possibly send window update to peer. 703 */ 704 static void 705 tcp_usr_rcvd(netmsg_t msg) 706 { 707 struct socket *so = msg->rcvd.base.nm_so; 708 int error = 0, noreply = 0; 709 struct inpcb *inp; 710 struct tcpcb *tp; 711 712 COMMON_START(so, inp, 0); 713 714 if (msg->rcvd.nm_pru_flags & PRUR_ASYNC) { 715 noreply = 1; 716 so_async_rcvd_reply(so); 717 } 718 tcp_output(tp); 719 720 COMMON_END1(PRU_RCVD, noreply); 721 } 722 723 /* 724 * Do a send by putting data in output queue and updating urgent 725 * marker if URG set. Possibly send more data. Unlike the other 726 * pru_*() routines, the mbuf chains are our responsibility. We 727 * must either enqueue them or free them. The other pru_* routines 728 * generally are caller-frees. 729 */ 730 static void 731 tcp_usr_send(netmsg_t msg) 732 { 733 struct socket *so = msg->send.base.nm_so; 734 int flags = msg->send.nm_flags; 735 struct mbuf *m = msg->send.nm_m; 736 int error = 0; 737 struct inpcb *inp; 738 struct tcpcb *tp; 739 TCPDEBUG0; 740 741 KKASSERT(msg->send.nm_control == NULL); 742 KKASSERT(msg->send.nm_addr == NULL); 743 KKASSERT((flags & PRUS_FREEADDR) == 0); 744 745 inp = so->so_pcb; 746 747 if (inp == NULL) { 748 /* 749 * OOPS! we lost a race, the TCP session got reset after 750 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a 751 * network interrupt in the non-critical section of sosend(). 752 */ 753 m_freem(m); 754 error = ECONNRESET; /* XXX EPIPE? */ 755 tp = NULL; 756 TCPDEBUG1(); 757 goto out; 758 } 759 tp = intotcpcb(inp); 760 TCPDEBUG1(); 761 762 #ifdef foo 763 /* 764 * This is no longer necessary, since: 765 * - sosendtcp() has already checked it for us 766 * - It does not work with asynchronized send 767 */ 768 769 /* 770 * Don't let too much OOB data build up 771 */ 772 if (flags & PRUS_OOB) { 773 if (ssb_space(&so->so_snd) < -512) { 774 m_freem(m); 775 error = ENOBUFS; 776 goto out; 777 } 778 } 779 #endif 780 781 /* 782 * Pump the data into the socket. 783 */ 784 if (m) 785 ssb_appendstream(&so->so_snd, m); 786 if (flags & PRUS_OOB) { 787 /* 788 * According to RFC961 (Assigned Protocols), 789 * the urgent pointer points to the last octet 790 * of urgent data. We continue, however, 791 * to consider it to indicate the first octet 792 * of data past the urgent section. 793 * Otherwise, snd_up should be one lower. 794 */ 795 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 796 tp->t_flags |= TF_FORCE; 797 error = tcp_output(tp); 798 tp->t_flags &= ~TF_FORCE; 799 } else { 800 if (flags & PRUS_EOF) { 801 /* 802 * Close the send side of the connection after 803 * the data is sent. 804 */ 805 socantsendmore(so); 806 tp = tcp_usrclosed(tp); 807 } 808 if (tp != NULL && !tcp_output_pending(tp)) { 809 if (flags & PRUS_MORETOCOME) 810 tp->t_flags |= TF_MORETOCOME; 811 error = tcp_output_fair(tp); 812 if (flags & PRUS_MORETOCOME) 813 tp->t_flags &= ~TF_MORETOCOME; 814 } 815 } 816 COMMON_END1((flags & PRUS_OOB) ? PRU_SENDOOB : 817 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND), 818 (flags & PRUS_NOREPLY)); 819 } 820 821 /* 822 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort() 823 * will sofree() it when we return. 824 */ 825 static void 826 tcp_usr_abort(netmsg_t msg) 827 { 828 struct socket *so = msg->abort.base.nm_so; 829 int error = 0; 830 struct inpcb *inp; 831 struct tcpcb *tp; 832 833 COMMON_START(so, inp, 1); 834 tp = tcp_drop(tp, ECONNABORTED); 835 COMMON_END(PRU_ABORT); 836 } 837 838 /* 839 * Receive out-of-band data. 840 */ 841 static void 842 tcp_usr_rcvoob(netmsg_t msg) 843 { 844 struct socket *so = msg->rcvoob.base.nm_so; 845 struct mbuf *m = msg->rcvoob.nm_m; 846 int flags = msg->rcvoob.nm_flags; 847 int error = 0; 848 struct inpcb *inp; 849 struct tcpcb *tp; 850 851 COMMON_START(so, inp, 0); 852 if ((so->so_oobmark == 0 && 853 (so->so_state & SS_RCVATMARK) == 0) || 854 so->so_options & SO_OOBINLINE || 855 tp->t_oobflags & TCPOOB_HADDATA) { 856 error = EINVAL; 857 goto out; 858 } 859 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 860 error = EWOULDBLOCK; 861 goto out; 862 } 863 m->m_len = 1; 864 *mtod(m, caddr_t) = tp->t_iobc; 865 if ((flags & MSG_PEEK) == 0) 866 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 867 COMMON_END(PRU_RCVOOB); 868 } 869 870 static void 871 tcp_usr_savefaddr(struct socket *so, const struct sockaddr *faddr) 872 { 873 in_savefaddr(so, faddr); 874 } 875 876 #ifdef INET6 877 static void 878 tcp6_usr_savefaddr(struct socket *so, const struct sockaddr *faddr) 879 { 880 in6_mapped_savefaddr(so, faddr); 881 } 882 #endif 883 884 /* xxx - should be const */ 885 struct pr_usrreqs tcp_usrreqs = { 886 .pru_abort = tcp_usr_abort, 887 .pru_accept = tcp_usr_accept, 888 .pru_attach = tcp_usr_attach, 889 .pru_bind = tcp_usr_bind, 890 .pru_connect = tcp_usr_connect, 891 .pru_connect2 = pr_generic_notsupp, 892 .pru_control = in_control_dispatch, 893 .pru_detach = tcp_usr_detach, 894 .pru_disconnect = tcp_usr_disconnect, 895 .pru_listen = tcp_usr_listen, 896 .pru_peeraddr = in_setpeeraddr_dispatch, 897 .pru_rcvd = tcp_usr_rcvd, 898 .pru_rcvoob = tcp_usr_rcvoob, 899 .pru_send = tcp_usr_send, 900 .pru_sense = pru_sense_null, 901 .pru_shutdown = tcp_usr_shutdown, 902 .pru_sockaddr = in_setsockaddr_dispatch, 903 .pru_sosend = sosendtcp, 904 .pru_soreceive = sorecvtcp, 905 .pru_savefaddr = tcp_usr_savefaddr 906 }; 907 908 #ifdef INET6 909 struct pr_usrreqs tcp6_usrreqs = { 910 .pru_abort = tcp_usr_abort, 911 .pru_accept = tcp6_usr_accept, 912 .pru_attach = tcp_usr_attach, 913 .pru_bind = tcp6_usr_bind, 914 .pru_connect = tcp6_usr_connect, 915 .pru_connect2 = pr_generic_notsupp, 916 .pru_control = in6_control_dispatch, 917 .pru_detach = tcp_usr_detach, 918 .pru_disconnect = tcp_usr_disconnect, 919 .pru_listen = tcp6_usr_listen, 920 .pru_peeraddr = in6_mapped_peeraddr_dispatch, 921 .pru_rcvd = tcp_usr_rcvd, 922 .pru_rcvoob = tcp_usr_rcvoob, 923 .pru_send = tcp_usr_send, 924 .pru_sense = pru_sense_null, 925 .pru_shutdown = tcp_usr_shutdown, 926 .pru_sockaddr = in6_mapped_sockaddr_dispatch, 927 .pru_sosend = sosendtcp, 928 .pru_soreceive = sorecvtcp, 929 .pru_savefaddr = tcp6_usr_savefaddr 930 }; 931 #endif /* INET6 */ 932 933 static int 934 tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m, 935 struct sockaddr_in *sin, struct sockaddr_in *if_sin) 936 { 937 struct inpcb *inp = tp->t_inpcb, *oinp; 938 struct socket *so = inp->inp_socket; 939 struct route *ro = &inp->inp_route; 940 941 oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid], 942 sin->sin_addr, sin->sin_port, 943 (inp->inp_laddr.s_addr != INADDR_ANY ? 944 inp->inp_laddr : if_sin->sin_addr), 945 inp->inp_lport, 0, NULL); 946 if (oinp != NULL) { 947 m_freem(m); 948 return (EADDRINUSE); 949 } 950 if (inp->inp_laddr.s_addr == INADDR_ANY) 951 inp->inp_laddr = if_sin->sin_addr; 952 inp->inp_faddr = sin->sin_addr; 953 inp->inp_fport = sin->sin_port; 954 inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid]; 955 in_pcbinsconnhash(inp); 956 957 /* 958 * We are now on the inpcb's owner CPU, if the cached route was 959 * freed because the rtentry's owner CPU is not the current CPU 960 * (e.g. in tcp_connect()), then we try to reallocate it here with 961 * the hope that a rtentry may be cloned from a RTF_PRCLONING 962 * rtentry. 963 */ 964 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/ 965 ro->ro_rt == NULL) { 966 bzero(&ro->ro_dst, sizeof(struct sockaddr_in)); 967 ro->ro_dst.sa_family = AF_INET; 968 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 969 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = 970 sin->sin_addr; 971 rtalloc(ro); 972 } 973 974 /* 975 * Now that no more errors can occur, change the protocol processing 976 * port to the current thread (which is the correct thread). 977 * 978 * Create TCP timer message now; we are on the tcpcb's owner 979 * CPU/thread. 980 */ 981 tcp_create_timermsg(tp, &curthread->td_msgport); 982 983 /* 984 * Compute window scaling to request. Use a larger scaling then 985 * needed for the initial receive buffer in case the receive buffer 986 * gets expanded. 987 */ 988 if (tp->request_r_scale < TCP_MIN_WINSHIFT) 989 tp->request_r_scale = TCP_MIN_WINSHIFT; 990 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 991 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat 992 ) { 993 tp->request_r_scale++; 994 } 995 996 soisconnecting(so); 997 tcpstat.tcps_connattempt++; 998 tp->t_state = TCPS_SYN_SENT; 999 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep); 1000 tp->iss = tcp_new_isn(tp); 1001 tcp_sendseqinit(tp); 1002 if (m) { 1003 ssb_appendstream(&so->so_snd, m); 1004 m = NULL; 1005 if (flags & PRUS_OOB) 1006 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 1007 } 1008 1009 /* 1010 * Close the send side of the connection after 1011 * the data is sent if flagged. 1012 */ 1013 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) { 1014 socantsendmore(so); 1015 tp = tcp_usrclosed(tp); 1016 } 1017 return (tcp_output(tp)); 1018 } 1019 1020 /* 1021 * Common subroutine to open a TCP connection to remote host specified 1022 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1023 * port number if needed. Call in_pcbladdr to do the routing and to choose 1024 * a local host address (interface). 1025 * Initialize connection parameters and enter SYN-SENT state. 1026 */ 1027 static void 1028 tcp_connect(netmsg_t msg) 1029 { 1030 struct socket *so = msg->connect.base.nm_so; 1031 struct sockaddr *nam = msg->connect.nm_nam; 1032 struct thread *td = msg->connect.nm_td; 1033 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 1034 struct sockaddr_in *if_sin; 1035 struct inpcb *inp; 1036 struct tcpcb *tp; 1037 int error, calc_laddr = 1; 1038 lwkt_port_t port; 1039 1040 COMMON_START(so, inp, 0); 1041 1042 /* 1043 * Reconnect our pcb if we have to 1044 */ 1045 if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) { 1046 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT; 1047 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1048 } 1049 1050 /* 1051 * Bind if we have to 1052 */ 1053 if (inp->inp_lport == 0) { 1054 if (tcp_lport_extension) { 1055 KKASSERT(inp->inp_laddr.s_addr == INADDR_ANY); 1056 1057 error = in_pcbladdr(inp, nam, &if_sin, td); 1058 if (error) 1059 goto out; 1060 inp->inp_laddr.s_addr = if_sin->sin_addr.s_addr; 1061 1062 error = in_pcbconn_bind(inp, nam, td); 1063 if (error) 1064 goto out; 1065 1066 calc_laddr = 0; 1067 } else { 1068 error = in_pcbbind(inp, NULL, td); 1069 if (error) 1070 goto out; 1071 } 1072 } 1073 1074 if (calc_laddr) { 1075 /* 1076 * Calculate the correct protocol processing thread. The 1077 * connect operation must run there. Set the forwarding 1078 * port before we forward the message or it will get bounced 1079 * right back to us. 1080 */ 1081 error = in_pcbladdr(inp, nam, &if_sin, td); 1082 if (error) 1083 goto out; 1084 } 1085 KKASSERT(inp->inp_socket == so); 1086 1087 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port, 1088 (inp->inp_laddr.s_addr ? 1089 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr), 1090 inp->inp_lport); 1091 1092 if (port != &curthread->td_msgport) { 1093 struct route *ro = &inp->inp_route; 1094 1095 /* 1096 * in_pcbladdr() may have allocated a route entry for us 1097 * on the current CPU, but we need a route entry on the 1098 * inpcb's owner CPU, so free it here. 1099 */ 1100 if (ro->ro_rt != NULL) 1101 RTFREE(ro->ro_rt); 1102 bzero(ro, sizeof(*ro)); 1103 1104 /* 1105 * We are moving the protocol processing port the socket 1106 * is on, we have to unlink here and re-link on the 1107 * target cpu. 1108 */ 1109 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1110 sosetport(so, port); 1111 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT; 1112 msg->connect.base.nm_dispatch = tcp_connect; 1113 1114 lwkt_forwardmsg(port, &msg->connect.base.lmsg); 1115 /* msg invalid now */ 1116 return; 1117 } 1118 error = tcp_connect_oncpu(tp, msg->connect.nm_flags, 1119 msg->connect.nm_m, sin, if_sin); 1120 msg->connect.nm_m = NULL; 1121 out: 1122 if (msg->connect.nm_m) { 1123 m_freem(msg->connect.nm_m); 1124 msg->connect.nm_m = NULL; 1125 } 1126 if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) { 1127 kfree(msg->connect.nm_nam, M_LWKTMSG); 1128 msg->connect.nm_nam = NULL; 1129 } 1130 lwkt_replymsg(&msg->connect.base.lmsg, error); 1131 /* msg invalid now */ 1132 } 1133 1134 #ifdef INET6 1135 1136 static void 1137 tcp6_connect(netmsg_t msg) 1138 { 1139 struct tcpcb *tp; 1140 struct socket *so = msg->connect.base.nm_so; 1141 struct sockaddr *nam = msg->connect.nm_nam; 1142 struct thread *td = msg->connect.nm_td; 1143 struct inpcb *inp; 1144 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 1145 struct in6_addr *addr6; 1146 lwkt_port_t port; 1147 int error; 1148 1149 COMMON_START(so, inp, 0); 1150 1151 /* 1152 * Reconnect our pcb if we have to 1153 */ 1154 if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) { 1155 msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT; 1156 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1157 } 1158 1159 /* 1160 * Bind if we have to 1161 */ 1162 if (inp->inp_lport == 0) { 1163 error = in6_pcbbind(inp, NULL, td); 1164 if (error) 1165 goto out; 1166 } 1167 1168 /* 1169 * Cannot simply call in_pcbconnect, because there might be an 1170 * earlier incarnation of this same connection still in 1171 * TIME_WAIT state, creating an ADDRINUSE error. 1172 */ 1173 error = in6_pcbladdr(inp, nam, &addr6, td); 1174 if (error) 1175 goto out; 1176 1177 port = tcp6_addrport(); /* XXX hack for now, always cpu0 */ 1178 1179 if (port != &curthread->td_msgport) { 1180 struct route *ro = &inp->inp_route; 1181 1182 /* 1183 * in_pcbladdr() may have allocated a route entry for us 1184 * on the current CPU, but we need a route entry on the 1185 * inpcb's owner CPU, so free it here. 1186 */ 1187 if (ro->ro_rt != NULL) 1188 RTFREE(ro->ro_rt); 1189 bzero(ro, sizeof(*ro)); 1190 1191 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1192 sosetport(so, port); 1193 msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT; 1194 msg->connect.base.nm_dispatch = tcp6_connect; 1195 1196 lwkt_forwardmsg(port, &msg->connect.base.lmsg); 1197 /* msg invalid now */ 1198 return; 1199 } 1200 error = tcp6_connect_oncpu(tp, msg->connect.nm_flags, 1201 &msg->connect.nm_m, sin6, addr6); 1202 /* nm_m may still be intact */ 1203 out: 1204 if (error && (msg->connect.nm_reconnect & NMSG_RECONNECT_FALLBACK)) { 1205 tcp_connect(msg); 1206 /* msg invalid now */ 1207 } else { 1208 if (msg->connect.nm_m) { 1209 m_freem(msg->connect.nm_m); 1210 msg->connect.nm_m = NULL; 1211 } 1212 if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) { 1213 kfree(msg->connect.nm_nam, M_LWKTMSG); 1214 msg->connect.nm_nam = NULL; 1215 } 1216 lwkt_replymsg(&msg->connect.base.lmsg, error); 1217 /* msg invalid now */ 1218 } 1219 } 1220 1221 static int 1222 tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp, 1223 struct sockaddr_in6 *sin6, struct in6_addr *addr6) 1224 { 1225 struct mbuf *m = *mp; 1226 struct inpcb *inp = tp->t_inpcb; 1227 struct socket *so = inp->inp_socket; 1228 struct inpcb *oinp; 1229 1230 /* 1231 * Cannot simply call in_pcbconnect, because there might be an 1232 * earlier incarnation of this same connection still in 1233 * TIME_WAIT state, creating an ADDRINUSE error. 1234 */ 1235 oinp = in6_pcblookup_hash(inp->inp_cpcbinfo, 1236 &sin6->sin6_addr, sin6->sin6_port, 1237 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ? 1238 addr6 : &inp->in6p_laddr), 1239 inp->inp_lport, 0, NULL); 1240 if (oinp) 1241 return (EADDRINUSE); 1242 1243 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1244 inp->in6p_laddr = *addr6; 1245 inp->in6p_faddr = sin6->sin6_addr; 1246 inp->inp_fport = sin6->sin6_port; 1247 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0) 1248 inp->in6p_flowinfo = sin6->sin6_flowinfo; 1249 in_pcbinsconnhash(inp); 1250 1251 /* 1252 * Now that no more errors can occur, change the protocol processing 1253 * port to the current thread (which is the correct thread). 1254 * 1255 * Create TCP timer message now; we are on the tcpcb's owner 1256 * CPU/thread. 1257 */ 1258 tcp_create_timermsg(tp, &curthread->td_msgport); 1259 1260 /* Compute window scaling to request. */ 1261 if (tp->request_r_scale < TCP_MIN_WINSHIFT) 1262 tp->request_r_scale = TCP_MIN_WINSHIFT; 1263 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1264 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) { 1265 tp->request_r_scale++; 1266 } 1267 1268 soisconnecting(so); 1269 tcpstat.tcps_connattempt++; 1270 tp->t_state = TCPS_SYN_SENT; 1271 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep); 1272 tp->iss = tcp_new_isn(tp); 1273 tcp_sendseqinit(tp); 1274 if (m) { 1275 ssb_appendstream(&so->so_snd, m); 1276 *mp = NULL; 1277 if (flags & PRUS_OOB) 1278 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 1279 } 1280 1281 /* 1282 * Close the send side of the connection after 1283 * the data is sent if flagged. 1284 */ 1285 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) { 1286 socantsendmore(so); 1287 tp = tcp_usrclosed(tp); 1288 } 1289 return (tcp_output(tp)); 1290 } 1291 1292 #endif /* INET6 */ 1293 1294 /* 1295 * The new sockopt interface makes it possible for us to block in the 1296 * copyin/out step (if we take a page fault). Taking a page fault while 1297 * in a critical section is probably a Bad Thing. (Since sockets and pcbs 1298 * both now use TSM, there probably isn't any need for this function to 1299 * run in a critical section any more. This needs more examination.) 1300 */ 1301 void 1302 tcp_ctloutput(netmsg_t msg) 1303 { 1304 struct socket *so = msg->base.nm_so; 1305 struct sockopt *sopt = msg->ctloutput.nm_sopt; 1306 int error, opt, optval, opthz; 1307 struct inpcb *inp; 1308 struct tcpcb *tp; 1309 1310 error = 0; 1311 inp = so->so_pcb; 1312 if (inp == NULL) { 1313 error = ECONNRESET; 1314 goto done; 1315 } 1316 1317 if (sopt->sopt_level != IPPROTO_TCP) { 1318 #ifdef INET6 1319 if (INP_CHECK_SOCKAF(so, AF_INET6)) 1320 ip6_ctloutput_dispatch(msg); 1321 else 1322 #endif /* INET6 */ 1323 ip_ctloutput(msg); 1324 /* msg invalid now */ 1325 return; 1326 } 1327 tp = intotcpcb(inp); 1328 1329 switch (sopt->sopt_dir) { 1330 case SOPT_SET: 1331 error = soopt_to_kbuf(sopt, &optval, sizeof optval, 1332 sizeof optval); 1333 if (error) 1334 break; 1335 switch (sopt->sopt_name) { 1336 case TCP_FASTKEEP: 1337 if (optval > 0) 1338 tp->t_keepidle = tp->t_keepintvl; 1339 else 1340 tp->t_keepidle = tcp_keepidle; 1341 tcp_timer_keep_activity(tp, 0); 1342 break; 1343 #ifdef TCP_SIGNATURE 1344 case TCP_SIGNATURE_ENABLE: 1345 if (tp->t_state == TCPS_CLOSED) { 1346 /* 1347 * This is the only safe state that this 1348 * option could be changed. Some segments 1349 * could already have been sent in other 1350 * states. 1351 */ 1352 if (optval > 0) 1353 tp->t_flags |= TF_SIGNATURE; 1354 else 1355 tp->t_flags &= ~TF_SIGNATURE; 1356 } else { 1357 error = EOPNOTSUPP; 1358 } 1359 break; 1360 #endif /* TCP_SIGNATURE */ 1361 case TCP_NODELAY: 1362 case TCP_NOOPT: 1363 switch (sopt->sopt_name) { 1364 case TCP_NODELAY: 1365 opt = TF_NODELAY; 1366 break; 1367 case TCP_NOOPT: 1368 opt = TF_NOOPT; 1369 break; 1370 default: 1371 opt = 0; /* dead code to fool gcc */ 1372 break; 1373 } 1374 1375 if (optval) 1376 tp->t_flags |= opt; 1377 else 1378 tp->t_flags &= ~opt; 1379 break; 1380 1381 case TCP_NOPUSH: 1382 if (tcp_disable_nopush) 1383 break; 1384 if (optval) 1385 tp->t_flags |= TF_NOPUSH; 1386 else { 1387 tp->t_flags &= ~TF_NOPUSH; 1388 error = tcp_output(tp); 1389 } 1390 break; 1391 1392 case TCP_MAXSEG: 1393 /* 1394 * Must be between 0 and maxseg. If the requested 1395 * maxseg is too small to satisfy the desired minmss, 1396 * pump it up (silently so sysctl modifications of 1397 * minmss do not create unexpected program failures). 1398 * Handle degenerate cases. 1399 */ 1400 if (optval > 0 && optval <= tp->t_maxseg) { 1401 if (optval + 40 < tcp_minmss) { 1402 optval = tcp_minmss - 40; 1403 if (optval < 0) 1404 optval = 1; 1405 } 1406 tp->t_maxseg = optval; 1407 } else { 1408 error = EINVAL; 1409 } 1410 break; 1411 1412 case TCP_KEEPINIT: 1413 opthz = ((int64_t)optval * hz) / 1000; 1414 if (opthz >= 1) 1415 tp->t_keepinit = opthz; 1416 else 1417 error = EINVAL; 1418 break; 1419 1420 case TCP_KEEPIDLE: 1421 opthz = ((int64_t)optval * hz) / 1000; 1422 if (opthz >= 1) { 1423 tp->t_keepidle = opthz; 1424 tcp_timer_keep_activity(tp, 0); 1425 } else { 1426 error = EINVAL; 1427 } 1428 break; 1429 1430 case TCP_KEEPINTVL: 1431 opthz = ((int64_t)optval * hz) / 1000; 1432 if (opthz >= 1) { 1433 tp->t_keepintvl = opthz; 1434 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt; 1435 } else { 1436 error = EINVAL; 1437 } 1438 break; 1439 1440 case TCP_KEEPCNT: 1441 if (optval > 0) { 1442 tp->t_keepcnt = optval; 1443 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt; 1444 } else { 1445 error = EINVAL; 1446 } 1447 break; 1448 1449 default: 1450 error = ENOPROTOOPT; 1451 break; 1452 } 1453 break; 1454 1455 case SOPT_GET: 1456 switch (sopt->sopt_name) { 1457 #ifdef TCP_SIGNATURE 1458 case TCP_SIGNATURE_ENABLE: 1459 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; 1460 break; 1461 #endif /* TCP_SIGNATURE */ 1462 case TCP_NODELAY: 1463 optval = tp->t_flags & TF_NODELAY; 1464 break; 1465 case TCP_MAXSEG: 1466 optval = tp->t_maxseg; 1467 break; 1468 case TCP_NOOPT: 1469 optval = tp->t_flags & TF_NOOPT; 1470 break; 1471 case TCP_NOPUSH: 1472 optval = tp->t_flags & TF_NOPUSH; 1473 break; 1474 case TCP_KEEPINIT: 1475 optval = ((int64_t)tp->t_keepinit * 1000) / hz; 1476 break; 1477 case TCP_KEEPIDLE: 1478 optval = ((int64_t)tp->t_keepidle * 1000) / hz; 1479 break; 1480 case TCP_KEEPINTVL: 1481 optval = ((int64_t)tp->t_keepintvl * 1000) / hz; 1482 break; 1483 case TCP_KEEPCNT: 1484 optval = tp->t_keepcnt; 1485 break; 1486 default: 1487 error = ENOPROTOOPT; 1488 break; 1489 } 1490 if (error == 0) 1491 soopt_from_kbuf(sopt, &optval, sizeof optval); 1492 break; 1493 } 1494 done: 1495 lwkt_replymsg(&msg->lmsg, error); 1496 } 1497 1498 /* 1499 * tcp_sendspace and tcp_recvspace are the default send and receive window 1500 * sizes, respectively. These are obsolescent (this information should 1501 * be set by the route). 1502 * 1503 * Use a default that does not require tcp window scaling to be turned 1504 * on. Individual programs or the administrator can increase the default. 1505 */ 1506 u_long tcp_sendspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ 1507 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, 1508 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); 1509 u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ 1510 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 1511 &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); 1512 1513 /* 1514 * Attach TCP protocol to socket, allocating internet protocol control 1515 * block, tcp control block, bufer space, and entering LISTEN state 1516 * if to accept connections. 1517 */ 1518 static int 1519 tcp_attach(struct socket *so, struct pru_attach_info *ai) 1520 { 1521 struct tcpcb *tp; 1522 struct inpcb *inp; 1523 int error; 1524 int cpu; 1525 #ifdef INET6 1526 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0; 1527 #endif 1528 1529 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) { 1530 lwkt_gettoken(&so->so_rcv.ssb_token); 1531 error = soreserve(so, tcp_sendspace, tcp_recvspace, 1532 ai->sb_rlimit); 1533 lwkt_reltoken(&so->so_rcv.ssb_token); 1534 if (error) 1535 return (error); 1536 } 1537 atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE); 1538 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE); 1539 cpu = mycpu->gd_cpuid; 1540 1541 /* 1542 * Set the default port for protocol processing. This will likely 1543 * change when we connect. 1544 */ 1545 error = in_pcballoc(so, &tcbinfo[cpu]); 1546 if (error) 1547 return (error); 1548 inp = so->so_pcb; 1549 #ifdef INET6 1550 if (isipv6) { 1551 inp->inp_vflag |= INP_IPV6; 1552 inp->in6p_hops = -1; /* use kernel default */ 1553 } 1554 else 1555 #endif 1556 inp->inp_vflag |= INP_IPV4; 1557 tp = tcp_newtcpcb(inp); 1558 if (tp == NULL) { 1559 /* 1560 * Make sure the socket is destroyed by the pcbdetach. 1561 */ 1562 soreference(so); 1563 #ifdef INET6 1564 if (isipv6) 1565 in6_pcbdetach(inp); 1566 else 1567 #endif 1568 in_pcbdetach(inp); 1569 sofree(so); /* from ref above */ 1570 return (ENOBUFS); 1571 } 1572 tp->t_state = TCPS_CLOSED; 1573 /* Keep a reference for asynchronized pru_rcvd */ 1574 soreference(so); 1575 return (0); 1576 } 1577 1578 /* 1579 * Initiate (or continue) disconnect. 1580 * If embryonic state, just send reset (once). 1581 * If in ``let data drain'' option and linger null, just drop. 1582 * Otherwise (hard), mark socket disconnecting and drop 1583 * current input data; switch states based on user close, and 1584 * send segment to peer (with FIN). 1585 */ 1586 static struct tcpcb * 1587 tcp_disconnect(struct tcpcb *tp) 1588 { 1589 struct socket *so = tp->t_inpcb->inp_socket; 1590 1591 if (tp->t_state < TCPS_ESTABLISHED) { 1592 tp = tcp_close(tp); 1593 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1594 tp = tcp_drop(tp, 0); 1595 } else { 1596 lwkt_gettoken(&so->so_rcv.ssb_token); 1597 soisdisconnecting(so); 1598 sbflush(&so->so_rcv.sb); 1599 tp = tcp_usrclosed(tp); 1600 if (tp) 1601 tcp_output(tp); 1602 lwkt_reltoken(&so->so_rcv.ssb_token); 1603 } 1604 return (tp); 1605 } 1606 1607 /* 1608 * User issued close, and wish to trail through shutdown states: 1609 * if never received SYN, just forget it. If got a SYN from peer, 1610 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1611 * If already got a FIN from peer, then almost done; go to LAST_ACK 1612 * state. In all other cases, have already sent FIN to peer (e.g. 1613 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1614 * for peer to send FIN or not respond to keep-alives, etc. 1615 * We can let the user exit from the close as soon as the FIN is acked. 1616 */ 1617 static struct tcpcb * 1618 tcp_usrclosed(struct tcpcb *tp) 1619 { 1620 1621 switch (tp->t_state) { 1622 1623 case TCPS_CLOSED: 1624 case TCPS_LISTEN: 1625 tp->t_state = TCPS_CLOSED; 1626 tp = tcp_close(tp); 1627 break; 1628 1629 case TCPS_SYN_SENT: 1630 case TCPS_SYN_RECEIVED: 1631 tp->t_flags |= TF_NEEDFIN; 1632 break; 1633 1634 case TCPS_ESTABLISHED: 1635 tp->t_state = TCPS_FIN_WAIT_1; 1636 break; 1637 1638 case TCPS_CLOSE_WAIT: 1639 tp->t_state = TCPS_LAST_ACK; 1640 break; 1641 } 1642 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) { 1643 soisdisconnected(tp->t_inpcb->inp_socket); 1644 /* To prevent the connection hanging in FIN_WAIT_2 forever. */ 1645 if (tp->t_state == TCPS_FIN_WAIT_2) { 1646 tcp_callout_reset(tp, tp->tt_2msl, tp->t_maxidle, 1647 tcp_timer_2msl); 1648 } 1649 } 1650 return (tp); 1651 } 1652