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sys/netinet/tcp_usrreq.c
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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 KASSERT(inp->inp_cpcbinfo == &tcbinfo[0], ("cpcbinfo is not tcbinfo0")); 413 414 if (tp->t_flags & TF_LISTEN) 415 goto out; 416 417 if (inp->inp_lport == 0) { 418 error = in_pcbbind(inp, NULL, td); 419 if (error) 420 goto out; 421 } 422 423 tp->t_state = TCPS_LISTEN; 424 tp->t_flags |= TF_LISTEN; 425 tp->tt_msg = NULL; /* Catch any invalid timer usage */ 426 427 if (ncpus > 1) { 428 /* 429 * We have to set the flag because we can't have other cpus 430 * messing with our inp's flags. 431 */ 432 KASSERT(!(inp->inp_flags & INP_CONNECTED), 433 ("already on connhash")); 434 KASSERT(!(inp->inp_flags & INP_WILDCARD), 435 ("already on wildcardhash")); 436 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP), 437 ("already on MP wildcardhash")); 438 inp->inp_flags |= INP_WILDCARD_MP; 439 440 netmsg_init(&nm.base, NULL, &curthread->td_msgport, 441 MSGF_PRIORITY, in_pcbinswildcardhash_handler); 442 nm.nm_inp = inp; 443 lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0); 444 } 445 in_pcbinswildcardhash(inp); 446 COMMON_END(PRU_LISTEN); 447 } 448 449 #ifdef INET6 450 451 static void 452 tcp6_usr_listen(netmsg_t msg) 453 { 454 struct socket *so = msg->listen.base.nm_so; 455 struct thread *td = msg->listen.nm_td; 456 int error = 0; 457 struct inpcb *inp; 458 struct tcpcb *tp; 459 struct netmsg_inswildcard nm; 460 461 COMMON_START(so, inp, 0); 462 463 if (tp->t_flags & TF_LISTEN) 464 goto out; 465 466 if (inp->inp_lport == 0) { 467 if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) 468 inp->inp_vflag |= INP_IPV4; 469 else 470 inp->inp_vflag &= ~INP_IPV4; 471 error = in6_pcbbind(inp, NULL, td); 472 if (error) 473 goto out; 474 } 475 476 tp->t_state = TCPS_LISTEN; 477 tp->t_flags |= TF_LISTEN; 478 tp->tt_msg = NULL; /* Catch any invalid timer usage */ 479 480 if (ncpus > 1) { 481 /* 482 * We have to set the flag because we can't have other cpus 483 * messing with our inp's flags. 484 */ 485 KASSERT(!(inp->inp_flags & INP_CONNECTED), 486 ("already on connhash")); 487 KASSERT(!(inp->inp_flags & INP_WILDCARD), 488 ("already on wildcardhash")); 489 KASSERT(!(inp->inp_flags & INP_WILDCARD_MP), 490 ("already on MP wildcardhash")); 491 inp->inp_flags |= INP_WILDCARD_MP; 492 493 KKASSERT(so->so_port == netisr_cpuport(0)); 494 KKASSERT(&curthread->td_msgport == netisr_cpuport(0)); 495 KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]); 496 497 netmsg_init(&nm.base, NULL, &curthread->td_msgport, 498 MSGF_PRIORITY, in_pcbinswildcardhash_handler); 499 nm.nm_inp = inp; 500 lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0); 501 } 502 in_pcbinswildcardhash(inp); 503 COMMON_END(PRU_LISTEN); 504 } 505 #endif /* INET6 */ 506 507 /* 508 * Initiate connection to peer. 509 * Create a template for use in transmissions on this connection. 510 * Enter SYN_SENT state, and mark socket as connecting. 511 * Start keep-alive timer, and seed output sequence space. 512 * Send initial segment on connection. 513 */ 514 static void 515 tcp_usr_connect(netmsg_t msg) 516 { 517 struct socket *so = msg->connect.base.nm_so; 518 struct sockaddr *nam = msg->connect.nm_nam; 519 struct thread *td = msg->connect.nm_td; 520 int error = 0; 521 struct inpcb *inp; 522 struct tcpcb *tp; 523 struct sockaddr_in *sinp; 524 525 COMMON_START(so, inp, 0); 526 527 /* 528 * Must disallow TCP ``connections'' to multicast addresses. 529 */ 530 sinp = (struct sockaddr_in *)nam; 531 if (sinp->sin_family == AF_INET 532 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 533 error = EAFNOSUPPORT; 534 goto out; 535 } 536 537 if (!prison_remote_ip(td, (struct sockaddr*)sinp)) { 538 error = EAFNOSUPPORT; /* IPv6 only jail */ 539 goto out; 540 } 541 542 tcp_connect(msg); 543 /* msg is invalid now */ 544 return; 545 out: 546 if (msg->connect.nm_m) { 547 m_freem(msg->connect.nm_m); 548 msg->connect.nm_m = NULL; 549 } 550 if (msg->connect.nm_flags & PRUC_HELDTD) 551 lwkt_rele(td); 552 if (error && (msg->connect.nm_flags & PRUC_ASYNC)) { 553 so->so_error = error; 554 soisdisconnected(so); 555 } 556 lwkt_replymsg(&msg->lmsg, error); 557 } 558 559 #ifdef INET6 560 561 static void 562 tcp6_usr_connect(netmsg_t msg) 563 { 564 struct socket *so = msg->connect.base.nm_so; 565 struct sockaddr *nam = msg->connect.nm_nam; 566 struct thread *td = msg->connect.nm_td; 567 int error = 0; 568 struct inpcb *inp; 569 struct tcpcb *tp; 570 struct sockaddr_in6 *sin6p; 571 572 COMMON_START(so, inp, 0); 573 574 /* 575 * Must disallow TCP ``connections'' to multicast addresses. 576 */ 577 sin6p = (struct sockaddr_in6 *)nam; 578 if (sin6p->sin6_family == AF_INET6 579 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 580 error = EAFNOSUPPORT; 581 goto out; 582 } 583 584 if (!prison_remote_ip(td, nam)) { 585 error = EAFNOSUPPORT; /* IPv4 only jail */ 586 goto out; 587 } 588 589 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 590 struct sockaddr_in *sinp; 591 592 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 593 error = EINVAL; 594 goto out; 595 } 596 sinp = kmalloc(sizeof(*sinp), M_LWKTMSG, M_INTWAIT); 597 in6_sin6_2_sin(sinp, sin6p); 598 inp->inp_vflag |= INP_IPV4; 599 inp->inp_vflag &= ~INP_IPV6; 600 msg->connect.nm_nam = (struct sockaddr *)sinp; 601 msg->connect.nm_flags |= PRUC_NAMALLOC; 602 tcp_connect(msg); 603 /* msg is invalid now */ 604 return; 605 } 606 inp->inp_vflag &= ~INP_IPV4; 607 inp->inp_vflag |= INP_IPV6; 608 inp->inp_inc.inc_isipv6 = 1; 609 610 msg->connect.nm_flags |= PRUC_FALLBACK; 611 tcp6_connect(msg); 612 /* msg is invalid now */ 613 return; 614 out: 615 if (msg->connect.nm_m) { 616 m_freem(msg->connect.nm_m); 617 msg->connect.nm_m = NULL; 618 } 619 lwkt_replymsg(&msg->lmsg, error); 620 } 621 622 #endif /* INET6 */ 623 624 /* 625 * Initiate disconnect from peer. 626 * If connection never passed embryonic stage, just drop; 627 * else if don't need to let data drain, then can just drop anyways, 628 * else have to begin TCP shutdown process: mark socket disconnecting, 629 * drain unread data, state switch to reflect user close, and 630 * send segment (e.g. FIN) to peer. Socket will be really disconnected 631 * when peer sends FIN and acks ours. 632 * 633 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 634 */ 635 static void 636 tcp_usr_disconnect(netmsg_t msg) 637 { 638 struct socket *so = msg->disconnect.base.nm_so; 639 int error = 0; 640 struct inpcb *inp; 641 struct tcpcb *tp; 642 643 COMMON_START(so, inp, 1); 644 tp = tcp_disconnect(tp); 645 COMMON_END(PRU_DISCONNECT); 646 } 647 648 /* 649 * Accept a connection. Essentially all the work is 650 * done at higher levels; just return the address 651 * of the peer, storing through addr. 652 */ 653 static void 654 tcp_usr_accept(netmsg_t msg) 655 { 656 struct socket *so = msg->accept.base.nm_so; 657 struct sockaddr **nam = msg->accept.nm_nam; 658 int error = 0; 659 struct inpcb *inp; 660 struct tcpcb *tp = NULL; 661 TCPDEBUG0; 662 663 inp = so->so_pcb; 664 if (so->so_state & SS_ISDISCONNECTED) { 665 error = ECONNABORTED; 666 goto out; 667 } 668 if (inp == 0) { 669 error = EINVAL; 670 goto out; 671 } 672 673 tp = intotcpcb(inp); 674 TCPDEBUG1(); 675 in_setpeeraddr(so, nam); 676 COMMON_END(PRU_ACCEPT); 677 } 678 679 #ifdef INET6 680 static void 681 tcp6_usr_accept(netmsg_t msg) 682 { 683 struct socket *so = msg->accept.base.nm_so; 684 struct sockaddr **nam = msg->accept.nm_nam; 685 int error = 0; 686 struct inpcb *inp; 687 struct tcpcb *tp = NULL; 688 TCPDEBUG0; 689 690 inp = so->so_pcb; 691 692 if (so->so_state & SS_ISDISCONNECTED) { 693 error = ECONNABORTED; 694 goto out; 695 } 696 if (inp == 0) { 697 error = EINVAL; 698 goto out; 699 } 700 tp = intotcpcb(inp); 701 TCPDEBUG1(); 702 in6_mapped_peeraddr(so, nam); 703 COMMON_END(PRU_ACCEPT); 704 } 705 #endif /* INET6 */ 706 /* 707 * Mark the connection as being incapable of further output. 708 */ 709 static void 710 tcp_usr_shutdown(netmsg_t msg) 711 { 712 struct socket *so = msg->shutdown.base.nm_so; 713 int error = 0; 714 struct inpcb *inp; 715 struct tcpcb *tp; 716 717 COMMON_START(so, inp, 0); 718 socantsendmore(so); 719 tp = tcp_usrclosed(tp); 720 if (tp) 721 error = tcp_output(tp); 722 COMMON_END(PRU_SHUTDOWN); 723 } 724 725 /* 726 * After a receive, possibly send window update to peer. 727 */ 728 static void 729 tcp_usr_rcvd(netmsg_t msg) 730 { 731 struct socket *so = msg->rcvd.base.nm_so; 732 int error = 0, noreply = 0; 733 struct inpcb *inp; 734 struct tcpcb *tp; 735 736 COMMON_START(so, inp, 0); 737 738 if (msg->rcvd.nm_pru_flags & PRUR_ASYNC) { 739 noreply = 1; 740 so_async_rcvd_reply(so); 741 } 742 tcp_output(tp); 743 744 COMMON_END1(PRU_RCVD, noreply); 745 } 746 747 /* 748 * Do a send by putting data in output queue and updating urgent 749 * marker if URG set. Possibly send more data. Unlike the other 750 * pru_*() routines, the mbuf chains are our responsibility. We 751 * must either enqueue them or free them. The other pru_* routines 752 * generally are caller-frees. 753 */ 754 static void 755 tcp_usr_send(netmsg_t msg) 756 { 757 struct socket *so = msg->send.base.nm_so; 758 int flags = msg->send.nm_flags; 759 struct mbuf *m = msg->send.nm_m; 760 int error = 0; 761 struct inpcb *inp; 762 struct tcpcb *tp; 763 TCPDEBUG0; 764 765 KKASSERT(msg->send.nm_control == NULL); 766 KKASSERT(msg->send.nm_addr == NULL); 767 KKASSERT((flags & PRUS_FREEADDR) == 0); 768 769 inp = so->so_pcb; 770 771 if (inp == NULL) { 772 /* 773 * OOPS! we lost a race, the TCP session got reset after 774 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a 775 * network interrupt in the non-critical section of sosend(). 776 */ 777 m_freem(m); 778 error = ECONNRESET; /* XXX EPIPE? */ 779 tp = NULL; 780 TCPDEBUG1(); 781 goto out; 782 } 783 tp = intotcpcb(inp); 784 TCPDEBUG1(); 785 786 #ifdef foo 787 /* 788 * This is no longer necessary, since: 789 * - sosendtcp() has already checked it for us 790 * - It does not work with asynchronized send 791 */ 792 793 /* 794 * Don't let too much OOB data build up 795 */ 796 if (flags & PRUS_OOB) { 797 if (ssb_space(&so->so_snd) < -512) { 798 m_freem(m); 799 error = ENOBUFS; 800 goto out; 801 } 802 } 803 #endif 804 805 /* 806 * Pump the data into the socket. 807 */ 808 if (m) 809 ssb_appendstream(&so->so_snd, m); 810 if (flags & PRUS_OOB) { 811 /* 812 * According to RFC961 (Assigned Protocols), 813 * the urgent pointer points to the last octet 814 * of urgent data. We continue, however, 815 * to consider it to indicate the first octet 816 * of data past the urgent section. 817 * Otherwise, snd_up should be one lower. 818 */ 819 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 820 tp->t_flags |= TF_FORCE; 821 error = tcp_output(tp); 822 tp->t_flags &= ~TF_FORCE; 823 } else { 824 if (flags & PRUS_EOF) { 825 /* 826 * Close the send side of the connection after 827 * the data is sent. 828 */ 829 socantsendmore(so); 830 tp = tcp_usrclosed(tp); 831 } 832 if (tp != NULL && !tcp_output_pending(tp)) { 833 if (flags & PRUS_MORETOCOME) 834 tp->t_flags |= TF_MORETOCOME; 835 error = tcp_output_fair(tp); 836 if (flags & PRUS_MORETOCOME) 837 tp->t_flags &= ~TF_MORETOCOME; 838 } 839 } 840 COMMON_END1((flags & PRUS_OOB) ? PRU_SENDOOB : 841 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND), 842 (flags & PRUS_NOREPLY)); 843 } 844 845 /* 846 * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort() 847 * will sofree() it when we return. 848 */ 849 static void 850 tcp_usr_abort(netmsg_t msg) 851 { 852 struct socket *so = msg->abort.base.nm_so; 853 int error = 0; 854 struct inpcb *inp; 855 struct tcpcb *tp; 856 857 COMMON_START(so, inp, 1); 858 tp = tcp_drop(tp, ECONNABORTED); 859 COMMON_END(PRU_ABORT); 860 } 861 862 /* 863 * Receive out-of-band data. 864 */ 865 static void 866 tcp_usr_rcvoob(netmsg_t msg) 867 { 868 struct socket *so = msg->rcvoob.base.nm_so; 869 struct mbuf *m = msg->rcvoob.nm_m; 870 int flags = msg->rcvoob.nm_flags; 871 int error = 0; 872 struct inpcb *inp; 873 struct tcpcb *tp; 874 875 COMMON_START(so, inp, 0); 876 if ((so->so_oobmark == 0 && 877 (so->so_state & SS_RCVATMARK) == 0) || 878 so->so_options & SO_OOBINLINE || 879 tp->t_oobflags & TCPOOB_HADDATA) { 880 error = EINVAL; 881 goto out; 882 } 883 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 884 error = EWOULDBLOCK; 885 goto out; 886 } 887 m->m_len = 1; 888 *mtod(m, caddr_t) = tp->t_iobc; 889 if ((flags & MSG_PEEK) == 0) 890 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 891 COMMON_END(PRU_RCVOOB); 892 } 893 894 static void 895 tcp_usr_savefaddr(struct socket *so, const struct sockaddr *faddr) 896 { 897 in_savefaddr(so, faddr); 898 } 899 900 #ifdef INET6 901 static void 902 tcp6_usr_savefaddr(struct socket *so, const struct sockaddr *faddr) 903 { 904 in6_mapped_savefaddr(so, faddr); 905 } 906 #endif 907 908 static int 909 tcp_usr_preconnect(struct socket *so, const struct sockaddr *nam, 910 struct thread *td __unused) 911 { 912 const struct sockaddr_in *sinp; 913 914 sinp = (const struct sockaddr_in *)nam; 915 if (sinp->sin_family == AF_INET && 916 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 917 return EAFNOSUPPORT; 918 919 soisconnecting(so); 920 return 0; 921 } 922 923 /* xxx - should be const */ 924 struct pr_usrreqs tcp_usrreqs = { 925 .pru_abort = tcp_usr_abort, 926 .pru_accept = tcp_usr_accept, 927 .pru_attach = tcp_usr_attach, 928 .pru_bind = tcp_usr_bind, 929 .pru_connect = tcp_usr_connect, 930 .pru_connect2 = pr_generic_notsupp, 931 .pru_control = in_control_dispatch, 932 .pru_detach = tcp_usr_detach, 933 .pru_disconnect = tcp_usr_disconnect, 934 .pru_listen = tcp_usr_listen, 935 .pru_peeraddr = in_setpeeraddr_dispatch, 936 .pru_rcvd = tcp_usr_rcvd, 937 .pru_rcvoob = tcp_usr_rcvoob, 938 .pru_send = tcp_usr_send, 939 .pru_sense = pru_sense_null, 940 .pru_shutdown = tcp_usr_shutdown, 941 .pru_sockaddr = in_setsockaddr_dispatch, 942 .pru_sosend = sosendtcp, 943 .pru_soreceive = sorecvtcp, 944 .pru_savefaddr = tcp_usr_savefaddr, 945 .pru_preconnect = tcp_usr_preconnect 946 }; 947 948 #ifdef INET6 949 struct pr_usrreqs tcp6_usrreqs = { 950 .pru_abort = tcp_usr_abort, 951 .pru_accept = tcp6_usr_accept, 952 .pru_attach = tcp_usr_attach, 953 .pru_bind = tcp6_usr_bind, 954 .pru_connect = tcp6_usr_connect, 955 .pru_connect2 = pr_generic_notsupp, 956 .pru_control = in6_control_dispatch, 957 .pru_detach = tcp_usr_detach, 958 .pru_disconnect = tcp_usr_disconnect, 959 .pru_listen = tcp6_usr_listen, 960 .pru_peeraddr = in6_mapped_peeraddr_dispatch, 961 .pru_rcvd = tcp_usr_rcvd, 962 .pru_rcvoob = tcp_usr_rcvoob, 963 .pru_send = tcp_usr_send, 964 .pru_sense = pru_sense_null, 965 .pru_shutdown = tcp_usr_shutdown, 966 .pru_sockaddr = in6_mapped_sockaddr_dispatch, 967 .pru_sosend = sosendtcp, 968 .pru_soreceive = sorecvtcp, 969 .pru_savefaddr = tcp6_usr_savefaddr 970 }; 971 #endif /* INET6 */ 972 973 static int 974 tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m, 975 struct sockaddr_in *sin, struct sockaddr_in *if_sin) 976 { 977 struct inpcb *inp = tp->t_inpcb, *oinp; 978 struct socket *so = inp->inp_socket; 979 struct route *ro = &inp->inp_route; 980 981 KASSERT(inp->inp_cpcbinfo == &tcbinfo[mycpu->gd_cpuid], 982 ("cpcbinfo mismatch")); 983 984 oinp = in_pcblookup_hash(inp->inp_cpcbinfo, 985 sin->sin_addr, sin->sin_port, 986 (inp->inp_laddr.s_addr != INADDR_ANY ? 987 inp->inp_laddr : if_sin->sin_addr), 988 inp->inp_lport, 0, NULL); 989 if (oinp != NULL) { 990 m_freem(m); 991 return (EADDRINUSE); 992 } 993 if (inp->inp_laddr.s_addr == INADDR_ANY) 994 inp->inp_laddr = if_sin->sin_addr; 995 inp->inp_faddr = sin->sin_addr; 996 inp->inp_fport = sin->sin_port; 997 in_pcbinsconnhash(inp); 998 999 /* 1000 * We are now on the inpcb's owner CPU, if the cached route was 1001 * freed because the rtentry's owner CPU is not the current CPU 1002 * (e.g. in tcp_connect()), then we try to reallocate it here with 1003 * the hope that a rtentry may be cloned from a RTF_PRCLONING 1004 * rtentry. 1005 */ 1006 if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/ 1007 ro->ro_rt == NULL) { 1008 bzero(&ro->ro_dst, sizeof(struct sockaddr_in)); 1009 ro->ro_dst.sa_family = AF_INET; 1010 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 1011 ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = 1012 sin->sin_addr; 1013 rtalloc(ro); 1014 } 1015 1016 /* 1017 * Now that no more errors can occur, change the protocol processing 1018 * port to the current thread (which is the correct thread). 1019 * 1020 * Create TCP timer message now; we are on the tcpcb's owner 1021 * CPU/thread. 1022 */ 1023 tcp_create_timermsg(tp, &curthread->td_msgport); 1024 1025 /* 1026 * Compute window scaling to request. Use a larger scaling then 1027 * needed for the initial receive buffer in case the receive buffer 1028 * gets expanded. 1029 */ 1030 if (tp->request_r_scale < TCP_MIN_WINSHIFT) 1031 tp->request_r_scale = TCP_MIN_WINSHIFT; 1032 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1033 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat 1034 ) { 1035 tp->request_r_scale++; 1036 } 1037 1038 soisconnecting(so); 1039 tcpstat.tcps_connattempt++; 1040 tp->t_state = TCPS_SYN_SENT; 1041 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep); 1042 tp->iss = tcp_new_isn(tp); 1043 tcp_sendseqinit(tp); 1044 if (m) { 1045 ssb_appendstream(&so->so_snd, m); 1046 m = NULL; 1047 if (flags & PRUS_OOB) 1048 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 1049 } 1050 1051 /* 1052 * Close the send side of the connection after 1053 * the data is sent if flagged. 1054 */ 1055 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) { 1056 socantsendmore(so); 1057 tp = tcp_usrclosed(tp); 1058 } 1059 return (tcp_output(tp)); 1060 } 1061 1062 /* 1063 * Common subroutine to open a TCP connection to remote host specified 1064 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1065 * port number if needed. Call in_pcbladdr to do the routing and to choose 1066 * a local host address (interface). 1067 * Initialize connection parameters and enter SYN-SENT state. 1068 */ 1069 static void 1070 tcp_connect(netmsg_t msg) 1071 { 1072 struct socket *so = msg->connect.base.nm_so; 1073 struct sockaddr *nam = msg->connect.nm_nam; 1074 struct thread *td = msg->connect.nm_td; 1075 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 1076 struct sockaddr_in *if_sin; 1077 struct inpcb *inp; 1078 struct tcpcb *tp; 1079 int error, calc_laddr = 1; 1080 lwkt_port_t port; 1081 1082 COMMON_START(so, inp, 0); 1083 1084 /* 1085 * Reconnect our pcb if we have to 1086 */ 1087 if (msg->connect.nm_flags & PRUC_RECONNECT) { 1088 msg->connect.nm_flags &= ~PRUC_RECONNECT; 1089 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1090 } 1091 1092 /* 1093 * Bind if we have to 1094 */ 1095 if (inp->inp_lport == 0) { 1096 if (tcp_lport_extension) { 1097 KKASSERT(inp->inp_laddr.s_addr == INADDR_ANY); 1098 1099 error = in_pcbladdr(inp, nam, &if_sin, td); 1100 if (error) 1101 goto out; 1102 inp->inp_laddr.s_addr = if_sin->sin_addr.s_addr; 1103 1104 error = in_pcbconn_bind(inp, nam, td); 1105 if (error) 1106 goto out; 1107 1108 calc_laddr = 0; 1109 } else { 1110 error = in_pcbbind(inp, NULL, td); 1111 if (error) 1112 goto out; 1113 } 1114 } 1115 1116 if (calc_laddr) { 1117 /* 1118 * Calculate the correct protocol processing thread. The 1119 * connect operation must run there. Set the forwarding 1120 * port before we forward the message or it will get bounced 1121 * right back to us. 1122 */ 1123 error = in_pcbladdr(inp, nam, &if_sin, td); 1124 if (error) 1125 goto out; 1126 } 1127 KKASSERT(inp->inp_socket == so); 1128 1129 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port, 1130 (inp->inp_laddr.s_addr ? 1131 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr), 1132 inp->inp_lport); 1133 1134 if (port != &curthread->td_msgport) { 1135 struct route *ro = &inp->inp_route; 1136 1137 /* 1138 * in_pcbladdr() may have allocated a route entry for us 1139 * on the current CPU, but we need a route entry on the 1140 * inpcb's owner CPU, so free it here. 1141 */ 1142 if (ro->ro_rt != NULL) 1143 RTFREE(ro->ro_rt); 1144 bzero(ro, sizeof(*ro)); 1145 1146 /* 1147 * We are moving the protocol processing port the socket 1148 * is on, we have to unlink here and re-link on the 1149 * target cpu. 1150 */ 1151 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1152 sosetport(so, port); 1153 msg->connect.nm_flags |= PRUC_RECONNECT; 1154 msg->connect.base.nm_dispatch = tcp_connect; 1155 1156 lwkt_forwardmsg(port, &msg->connect.base.lmsg); 1157 /* msg invalid now */ 1158 return; 1159 } else if (msg->connect.nm_flags & PRUC_HELDTD) { 1160 /* 1161 * The original thread is no longer needed; release it. 1162 */ 1163 lwkt_rele(td); 1164 msg->connect.nm_flags &= ~PRUC_HELDTD; 1165 } 1166 error = tcp_connect_oncpu(tp, msg->connect.nm_sndflags, 1167 msg->connect.nm_m, sin, if_sin); 1168 msg->connect.nm_m = NULL; 1169 out: 1170 if (msg->connect.nm_m) { 1171 m_freem(msg->connect.nm_m); 1172 msg->connect.nm_m = NULL; 1173 } 1174 if (msg->connect.nm_flags & PRUC_NAMALLOC) { 1175 kfree(msg->connect.nm_nam, M_LWKTMSG); 1176 msg->connect.nm_nam = NULL; 1177 } 1178 if (msg->connect.nm_flags & PRUC_HELDTD) 1179 lwkt_rele(td); 1180 if (error && (msg->connect.nm_flags & PRUC_ASYNC)) { 1181 so->so_error = error; 1182 soisdisconnected(so); 1183 } 1184 lwkt_replymsg(&msg->connect.base.lmsg, error); 1185 /* msg invalid now */ 1186 } 1187 1188 #ifdef INET6 1189 1190 static void 1191 tcp6_connect(netmsg_t msg) 1192 { 1193 struct tcpcb *tp; 1194 struct socket *so = msg->connect.base.nm_so; 1195 struct sockaddr *nam = msg->connect.nm_nam; 1196 struct thread *td = msg->connect.nm_td; 1197 struct inpcb *inp; 1198 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 1199 struct in6_addr *addr6; 1200 lwkt_port_t port; 1201 int error; 1202 1203 COMMON_START(so, inp, 0); 1204 1205 /* 1206 * Reconnect our pcb if we have to 1207 */ 1208 if (msg->connect.nm_flags & PRUC_RECONNECT) { 1209 msg->connect.nm_flags &= ~PRUC_RECONNECT; 1210 in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1211 } 1212 1213 /* 1214 * Bind if we have to 1215 */ 1216 if (inp->inp_lport == 0) { 1217 error = in6_pcbbind(inp, NULL, td); 1218 if (error) 1219 goto out; 1220 } 1221 1222 /* 1223 * Cannot simply call in_pcbconnect, because there might be an 1224 * earlier incarnation of this same connection still in 1225 * TIME_WAIT state, creating an ADDRINUSE error. 1226 */ 1227 error = in6_pcbladdr(inp, nam, &addr6, td); 1228 if (error) 1229 goto out; 1230 1231 port = tcp6_addrport(); /* XXX hack for now, always cpu0 */ 1232 1233 if (port != &curthread->td_msgport) { 1234 struct route *ro = &inp->inp_route; 1235 1236 /* 1237 * in_pcbladdr() may have allocated a route entry for us 1238 * on the current CPU, but we need a route entry on the 1239 * inpcb's owner CPU, so free it here. 1240 */ 1241 if (ro->ro_rt != NULL) 1242 RTFREE(ro->ro_rt); 1243 bzero(ro, sizeof(*ro)); 1244 1245 in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); 1246 sosetport(so, port); 1247 msg->connect.nm_flags |= PRUC_RECONNECT; 1248 msg->connect.base.nm_dispatch = tcp6_connect; 1249 1250 lwkt_forwardmsg(port, &msg->connect.base.lmsg); 1251 /* msg invalid now */ 1252 return; 1253 } 1254 error = tcp6_connect_oncpu(tp, msg->connect.nm_sndflags, 1255 &msg->connect.nm_m, sin6, addr6); 1256 /* nm_m may still be intact */ 1257 out: 1258 if (error && (msg->connect.nm_flags & PRUC_FALLBACK)) { 1259 tcp_connect(msg); 1260 /* msg invalid now */ 1261 } else { 1262 if (msg->connect.nm_m) { 1263 m_freem(msg->connect.nm_m); 1264 msg->connect.nm_m = NULL; 1265 } 1266 if (msg->connect.nm_flags & PRUC_NAMALLOC) { 1267 kfree(msg->connect.nm_nam, M_LWKTMSG); 1268 msg->connect.nm_nam = NULL; 1269 } 1270 lwkt_replymsg(&msg->connect.base.lmsg, error); 1271 /* msg invalid now */ 1272 } 1273 } 1274 1275 static int 1276 tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp, 1277 struct sockaddr_in6 *sin6, struct in6_addr *addr6) 1278 { 1279 struct mbuf *m = *mp; 1280 struct inpcb *inp = tp->t_inpcb; 1281 struct socket *so = inp->inp_socket; 1282 struct inpcb *oinp; 1283 1284 /* 1285 * Cannot simply call in_pcbconnect, because there might be an 1286 * earlier incarnation of this same connection still in 1287 * TIME_WAIT state, creating an ADDRINUSE error. 1288 */ 1289 oinp = in6_pcblookup_hash(inp->inp_cpcbinfo, 1290 &sin6->sin6_addr, sin6->sin6_port, 1291 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ? 1292 addr6 : &inp->in6p_laddr), 1293 inp->inp_lport, 0, NULL); 1294 if (oinp) 1295 return (EADDRINUSE); 1296 1297 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1298 inp->in6p_laddr = *addr6; 1299 inp->in6p_faddr = sin6->sin6_addr; 1300 inp->inp_fport = sin6->sin6_port; 1301 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0) 1302 inp->in6p_flowinfo = sin6->sin6_flowinfo; 1303 in_pcbinsconnhash(inp); 1304 1305 /* 1306 * Now that no more errors can occur, change the protocol processing 1307 * port to the current thread (which is the correct thread). 1308 * 1309 * Create TCP timer message now; we are on the tcpcb's owner 1310 * CPU/thread. 1311 */ 1312 tcp_create_timermsg(tp, &curthread->td_msgport); 1313 1314 /* Compute window scaling to request. */ 1315 if (tp->request_r_scale < TCP_MIN_WINSHIFT) 1316 tp->request_r_scale = TCP_MIN_WINSHIFT; 1317 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1318 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) { 1319 tp->request_r_scale++; 1320 } 1321 1322 soisconnecting(so); 1323 tcpstat.tcps_connattempt++; 1324 tp->t_state = TCPS_SYN_SENT; 1325 tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep); 1326 tp->iss = tcp_new_isn(tp); 1327 tcp_sendseqinit(tp); 1328 if (m) { 1329 ssb_appendstream(&so->so_snd, m); 1330 *mp = NULL; 1331 if (flags & PRUS_OOB) 1332 tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; 1333 } 1334 1335 /* 1336 * Close the send side of the connection after 1337 * the data is sent if flagged. 1338 */ 1339 if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) { 1340 socantsendmore(so); 1341 tp = tcp_usrclosed(tp); 1342 } 1343 return (tcp_output(tp)); 1344 } 1345 1346 #endif /* INET6 */ 1347 1348 /* 1349 * The new sockopt interface makes it possible for us to block in the 1350 * copyin/out step (if we take a page fault). Taking a page fault while 1351 * in a critical section is probably a Bad Thing. (Since sockets and pcbs 1352 * both now use TSM, there probably isn't any need for this function to 1353 * run in a critical section any more. This needs more examination.) 1354 */ 1355 void 1356 tcp_ctloutput(netmsg_t msg) 1357 { 1358 struct socket *so = msg->base.nm_so; 1359 struct sockopt *sopt = msg->ctloutput.nm_sopt; 1360 int error, opt, optval, opthz; 1361 struct inpcb *inp; 1362 struct tcpcb *tp; 1363 1364 error = 0; 1365 inp = so->so_pcb; 1366 if (inp == NULL) { 1367 error = ECONNRESET; 1368 goto done; 1369 } 1370 1371 if (sopt->sopt_level != IPPROTO_TCP) { 1372 #ifdef INET6 1373 if (INP_CHECK_SOCKAF(so, AF_INET6)) 1374 ip6_ctloutput_dispatch(msg); 1375 else 1376 #endif /* INET6 */ 1377 ip_ctloutput(msg); 1378 /* msg invalid now */ 1379 return; 1380 } 1381 tp = intotcpcb(inp); 1382 1383 switch (sopt->sopt_dir) { 1384 case SOPT_SET: 1385 error = soopt_to_kbuf(sopt, &optval, sizeof optval, 1386 sizeof optval); 1387 if (error) 1388 break; 1389 switch (sopt->sopt_name) { 1390 case TCP_FASTKEEP: 1391 if (optval > 0) 1392 tp->t_keepidle = tp->t_keepintvl; 1393 else 1394 tp->t_keepidle = tcp_keepidle; 1395 tcp_timer_keep_activity(tp, 0); 1396 break; 1397 #ifdef TCP_SIGNATURE 1398 case TCP_SIGNATURE_ENABLE: 1399 if (tp->t_state == TCPS_CLOSED) { 1400 /* 1401 * This is the only safe state that this 1402 * option could be changed. Some segments 1403 * could already have been sent in other 1404 * states. 1405 */ 1406 if (optval > 0) 1407 tp->t_flags |= TF_SIGNATURE; 1408 else 1409 tp->t_flags &= ~TF_SIGNATURE; 1410 } else { 1411 error = EOPNOTSUPP; 1412 } 1413 break; 1414 #endif /* TCP_SIGNATURE */ 1415 case TCP_NODELAY: 1416 case TCP_NOOPT: 1417 switch (sopt->sopt_name) { 1418 case TCP_NODELAY: 1419 opt = TF_NODELAY; 1420 break; 1421 case TCP_NOOPT: 1422 opt = TF_NOOPT; 1423 break; 1424 default: 1425 opt = 0; /* dead code to fool gcc */ 1426 break; 1427 } 1428 1429 if (optval) 1430 tp->t_flags |= opt; 1431 else 1432 tp->t_flags &= ~opt; 1433 break; 1434 1435 case TCP_NOPUSH: 1436 if (tcp_disable_nopush) 1437 break; 1438 if (optval) 1439 tp->t_flags |= TF_NOPUSH; 1440 else { 1441 tp->t_flags &= ~TF_NOPUSH; 1442 error = tcp_output(tp); 1443 } 1444 break; 1445 1446 case TCP_MAXSEG: 1447 /* 1448 * Must be between 0 and maxseg. If the requested 1449 * maxseg is too small to satisfy the desired minmss, 1450 * pump it up (silently so sysctl modifications of 1451 * minmss do not create unexpected program failures). 1452 * Handle degenerate cases. 1453 */ 1454 if (optval > 0 && optval <= tp->t_maxseg) { 1455 if (optval + 40 < tcp_minmss) { 1456 optval = tcp_minmss - 40; 1457 if (optval < 0) 1458 optval = 1; 1459 } 1460 tp->t_maxseg = optval; 1461 } else { 1462 error = EINVAL; 1463 } 1464 break; 1465 1466 case TCP_KEEPINIT: 1467 opthz = ((int64_t)optval * hz) / 1000; 1468 if (opthz >= 1) 1469 tp->t_keepinit = opthz; 1470 else 1471 error = EINVAL; 1472 break; 1473 1474 case TCP_KEEPIDLE: 1475 opthz = ((int64_t)optval * hz) / 1000; 1476 if (opthz >= 1) { 1477 tp->t_keepidle = opthz; 1478 tcp_timer_keep_activity(tp, 0); 1479 } else { 1480 error = EINVAL; 1481 } 1482 break; 1483 1484 case TCP_KEEPINTVL: 1485 opthz = ((int64_t)optval * hz) / 1000; 1486 if (opthz >= 1) { 1487 tp->t_keepintvl = opthz; 1488 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt; 1489 } else { 1490 error = EINVAL; 1491 } 1492 break; 1493 1494 case TCP_KEEPCNT: 1495 if (optval > 0) { 1496 tp->t_keepcnt = optval; 1497 tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt; 1498 } else { 1499 error = EINVAL; 1500 } 1501 break; 1502 1503 default: 1504 error = ENOPROTOOPT; 1505 break; 1506 } 1507 break; 1508 1509 case SOPT_GET: 1510 switch (sopt->sopt_name) { 1511 #ifdef TCP_SIGNATURE 1512 case TCP_SIGNATURE_ENABLE: 1513 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; 1514 break; 1515 #endif /* TCP_SIGNATURE */ 1516 case TCP_NODELAY: 1517 optval = tp->t_flags & TF_NODELAY; 1518 break; 1519 case TCP_MAXSEG: 1520 optval = tp->t_maxseg; 1521 break; 1522 case TCP_NOOPT: 1523 optval = tp->t_flags & TF_NOOPT; 1524 break; 1525 case TCP_NOPUSH: 1526 optval = tp->t_flags & TF_NOPUSH; 1527 break; 1528 case TCP_KEEPINIT: 1529 optval = ((int64_t)tp->t_keepinit * 1000) / hz; 1530 break; 1531 case TCP_KEEPIDLE: 1532 optval = ((int64_t)tp->t_keepidle * 1000) / hz; 1533 break; 1534 case TCP_KEEPINTVL: 1535 optval = ((int64_t)tp->t_keepintvl * 1000) / hz; 1536 break; 1537 case TCP_KEEPCNT: 1538 optval = tp->t_keepcnt; 1539 break; 1540 default: 1541 error = ENOPROTOOPT; 1542 break; 1543 } 1544 if (error == 0) 1545 soopt_from_kbuf(sopt, &optval, sizeof optval); 1546 break; 1547 } 1548 done: 1549 lwkt_replymsg(&msg->lmsg, error); 1550 } 1551 1552 /* 1553 * tcp_sendspace and tcp_recvspace are the default send and receive window 1554 * sizes, respectively. These are obsolescent (this information should 1555 * be set by the route). 1556 * 1557 * Use a default that does not require tcp window scaling to be turned 1558 * on. Individual programs or the administrator can increase the default. 1559 */ 1560 u_long tcp_sendspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ 1561 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, 1562 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); 1563 u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ 1564 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 1565 &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); 1566 1567 /* 1568 * Attach TCP protocol to socket, allocating internet protocol control 1569 * block, tcp control block, buffer space, and entering CLOSED state. 1570 */ 1571 static int 1572 tcp_attach(struct socket *so, struct pru_attach_info *ai) 1573 { 1574 struct tcpcb *tp; 1575 struct inpcb *inp; 1576 int error; 1577 int cpu; 1578 #ifdef INET6 1579 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0; 1580 #endif 1581 1582 if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) { 1583 lwkt_gettoken(&so->so_rcv.ssb_token); 1584 error = soreserve(so, tcp_sendspace, tcp_recvspace, 1585 ai->sb_rlimit); 1586 lwkt_reltoken(&so->so_rcv.ssb_token); 1587 if (error) 1588 return (error); 1589 } 1590 atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE); 1591 atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE); 1592 cpu = mycpu->gd_cpuid; 1593 1594 /* 1595 * Set the default port for protocol processing. This will likely 1596 * change when we connect. 1597 */ 1598 error = in_pcballoc(so, &tcbinfo[cpu]); 1599 if (error) 1600 return (error); 1601 inp = so->so_pcb; 1602 #ifdef INET6 1603 if (isipv6) { 1604 inp->inp_vflag |= INP_IPV6; 1605 inp->in6p_hops = -1; /* use kernel default */ 1606 } 1607 else 1608 #endif 1609 inp->inp_vflag |= INP_IPV4; 1610 tp = tcp_newtcpcb(inp); 1611 if (tp == NULL) { 1612 /* 1613 * Make sure the socket is destroyed by the pcbdetach. 1614 */ 1615 soreference(so); 1616 #ifdef INET6 1617 if (isipv6) 1618 in6_pcbdetach(inp); 1619 else 1620 #endif 1621 in_pcbdetach(inp); 1622 sofree(so); /* from ref above */ 1623 return (ENOBUFS); 1624 } 1625 tp->t_state = TCPS_CLOSED; 1626 /* Keep a reference for asynchronized pru_rcvd */ 1627 soreference(so); 1628 return (0); 1629 } 1630 1631 /* 1632 * Initiate (or continue) disconnect. 1633 * If embryonic state, just send reset (once). 1634 * If in ``let data drain'' option and linger null, just drop. 1635 * Otherwise (hard), mark socket disconnecting and drop 1636 * current input data; switch states based on user close, and 1637 * send segment to peer (with FIN). 1638 */ 1639 static struct tcpcb * 1640 tcp_disconnect(struct tcpcb *tp) 1641 { 1642 struct socket *so = tp->t_inpcb->inp_socket; 1643 1644 if (tp->t_state < TCPS_ESTABLISHED) { 1645 tp = tcp_close(tp); 1646 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1647 tp = tcp_drop(tp, 0); 1648 } else { 1649 lwkt_gettoken(&so->so_rcv.ssb_token); 1650 soisdisconnecting(so); 1651 sbflush(&so->so_rcv.sb); 1652 tp = tcp_usrclosed(tp); 1653 if (tp) 1654 tcp_output(tp); 1655 lwkt_reltoken(&so->so_rcv.ssb_token); 1656 } 1657 return (tp); 1658 } 1659 1660 /* 1661 * User issued close, and wish to trail through shutdown states: 1662 * if never received SYN, just forget it. If got a SYN from peer, 1663 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1664 * If already got a FIN from peer, then almost done; go to LAST_ACK 1665 * state. In all other cases, have already sent FIN to peer (e.g. 1666 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1667 * for peer to send FIN or not respond to keep-alives, etc. 1668 * We can let the user exit from the close as soon as the FIN is acked. 1669 */ 1670 static struct tcpcb * 1671 tcp_usrclosed(struct tcpcb *tp) 1672 { 1673 1674 switch (tp->t_state) { 1675 1676 case TCPS_CLOSED: 1677 case TCPS_LISTEN: 1678 tp->t_state = TCPS_CLOSED; 1679 tp = tcp_close(tp); 1680 break; 1681 1682 case TCPS_SYN_SENT: 1683 case TCPS_SYN_RECEIVED: 1684 tp->t_flags |= TF_NEEDFIN; 1685 break; 1686 1687 case TCPS_ESTABLISHED: 1688 tp->t_state = TCPS_FIN_WAIT_1; 1689 break; 1690 1691 case TCPS_CLOSE_WAIT: 1692 tp->t_state = TCPS_LAST_ACK; 1693 break; 1694 } 1695 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) { 1696 soisdisconnected(tp->t_inpcb->inp_socket); 1697 /* To prevent the connection hanging in FIN_WAIT_2 forever. */ 1698 if (tp->t_state == TCPS_FIN_WAIT_2) { 1699 tcp_callout_reset(tp, tp->tt_2msl, tp->t_maxidle, 1700 tcp_timer_2msl); 1701 } 1702 } 1703 return (tp); 1704 }
Cache object: bb40e172fab75e31e85c5beb0a914064
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