1 /* 2 * Copyright (c) 1982, 1986, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94 34 * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.17 2002/10/11 11:46:44 ume Exp $ 35 * $DragonFly: src/sys/netinet/tcp_usrreq.c,v 1.22 2004/05/08 02:38:36 dillon Exp $ 36 */ 37 38 #include "opt_ipsec.h" 39 #include "opt_inet6.h" 40 #include "opt_tcpdebug.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/malloc.h> 46 #include <sys/sysctl.h> 47 #include <sys/globaldata.h> 48 #include <sys/thread.h> 49 50 #include <sys/mbuf.h> 51 #ifdef INET6 52 #include <sys/domain.h> 53 #endif /* INET6 */ 54 #include <sys/socket.h> 55 #include <sys/socketvar.h> 56 #include <sys/protosw.h> 57 58 #include <sys/msgport2.h> 59 60 #include <net/if.h> 61 #include <net/netisr.h> 62 #include <net/route.h> 63 64 #include <netinet/in.h> 65 #include <netinet/in_systm.h> 66 #ifdef INET6 67 #include <netinet/ip6.h> 68 #endif 69 #include <netinet/in_pcb.h> 70 #ifdef INET6 71 #include <netinet6/in6_pcb.h> 72 #endif 73 #include <netinet/in_var.h> 74 #include <netinet/ip_var.h> 75 #ifdef INET6 76 #include <netinet6/ip6_var.h> 77 #endif 78 #include <netinet/tcp.h> 79 #include <netinet/tcp_fsm.h> 80 #include <netinet/tcp_seq.h> 81 #include <netinet/tcp_timer.h> 82 #include <netinet/tcp_var.h> 83 #include <netinet/tcpip.h> 84 #ifdef TCPDEBUG 85 #include <netinet/tcp_debug.h> 86 #endif 87 88 #ifdef IPSEC 89 #include <netinet6/ipsec.h> 90 #endif /*IPSEC*/ 91 92 /* 93 * TCP protocol interface to socket abstraction. 94 */ 95 extern char *tcpstates[]; /* XXX ??? */ 96 97 static int tcp_attach (struct socket *, struct pru_attach_info *); 98 static int tcp_connect (struct tcpcb *, struct sockaddr *, 99 struct thread *); 100 #ifdef INET6 101 static int tcp6_connect (struct tcpcb *, struct sockaddr *, 102 struct thread *); 103 #endif /* INET6 */ 104 static struct tcpcb * 105 tcp_disconnect (struct tcpcb *); 106 static struct tcpcb * 107 tcp_usrclosed (struct tcpcb *); 108 109 #ifdef TCPDEBUG 110 #define TCPDEBUG0 int ostate = 0 111 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 112 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 113 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 114 #else 115 #define TCPDEBUG0 116 #define TCPDEBUG1() 117 #define TCPDEBUG2(req) 118 #endif 119 120 /* 121 * TCP attaches to socket via pru_attach(), reserving space, 122 * and an internet control block. 123 */ 124 static int 125 tcp_usr_attach(struct socket *so, int proto, struct pru_attach_info *ai) 126 { 127 int s = splnet(); 128 int error; 129 struct inpcb *inp = sotoinpcb(so); 130 struct tcpcb *tp = 0; 131 TCPDEBUG0; 132 133 TCPDEBUG1(); 134 if (inp) { 135 error = EISCONN; 136 goto out; 137 } 138 139 error = tcp_attach(so, ai); 140 if (error) 141 goto out; 142 143 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 144 so->so_linger = TCP_LINGERTIME; 145 tp = sototcpcb(so); 146 out: 147 TCPDEBUG2(PRU_ATTACH); 148 splx(s); 149 return error; 150 } 151 152 /* 153 * pru_detach() detaches the TCP protocol from the socket. 154 * If the protocol state is non-embryonic, then can't 155 * do this directly: have to initiate a pru_disconnect(), 156 * which may finish later; embryonic TCB's can just 157 * be discarded here. 158 */ 159 static int 160 tcp_usr_detach(struct socket *so) 161 { 162 int s = splnet(); 163 int error = 0; 164 struct inpcb *inp = sotoinpcb(so); 165 struct tcpcb *tp; 166 TCPDEBUG0; 167 168 if (inp == 0) { 169 splx(s); 170 return EINVAL; /* XXX */ 171 } 172 tp = intotcpcb(inp); 173 TCPDEBUG1(); 174 tp = tcp_disconnect(tp); 175 176 TCPDEBUG2(PRU_DETACH); 177 splx(s); 178 return error; 179 } 180 181 #define COMMON_START() TCPDEBUG0; \ 182 do { \ 183 if (inp == 0) { \ 184 splx(s); \ 185 return EINVAL; \ 186 } \ 187 tp = intotcpcb(inp); \ 188 TCPDEBUG1(); \ 189 } while(0) 190 191 #define COMMON_END(req) out: TCPDEBUG2(req); splx(s); return error; goto out 192 193 194 /* 195 * Give the socket an address. 196 */ 197 static int 198 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 199 { 200 int s = splnet(); 201 int error = 0; 202 struct inpcb *inp = sotoinpcb(so); 203 struct tcpcb *tp; 204 struct sockaddr_in *sinp; 205 206 COMMON_START(); 207 208 /* 209 * Must check for multicast addresses and disallow binding 210 * to them. 211 */ 212 sinp = (struct sockaddr_in *)nam; 213 if (sinp->sin_family == AF_INET && 214 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 215 error = EAFNOSUPPORT; 216 goto out; 217 } 218 error = in_pcbbind(inp, nam, td); 219 if (error) 220 goto out; 221 COMMON_END(PRU_BIND); 222 223 } 224 225 #ifdef INET6 226 static int 227 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 228 { 229 int s = splnet(); 230 int error = 0; 231 struct inpcb *inp = sotoinpcb(so); 232 struct tcpcb *tp; 233 struct sockaddr_in6 *sin6p; 234 235 COMMON_START(); 236 237 /* 238 * Must check for multicast addresses and disallow binding 239 * to them. 240 */ 241 sin6p = (struct sockaddr_in6 *)nam; 242 if (sin6p->sin6_family == AF_INET6 && 243 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 244 error = EAFNOSUPPORT; 245 goto out; 246 } 247 inp->inp_vflag &= ~INP_IPV4; 248 inp->inp_vflag |= INP_IPV6; 249 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 250 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 251 inp->inp_vflag |= INP_IPV4; 252 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 253 struct sockaddr_in sin; 254 255 in6_sin6_2_sin(&sin, sin6p); 256 inp->inp_vflag |= INP_IPV4; 257 inp->inp_vflag &= ~INP_IPV6; 258 error = in_pcbbind(inp, (struct sockaddr *)&sin, td); 259 goto out; 260 } 261 } 262 error = in6_pcbbind(inp, nam, td); 263 if (error) 264 goto out; 265 COMMON_END(PRU_BIND); 266 } 267 #endif /* INET6 */ 268 269 #ifdef SMP 270 struct netmsg_inswildcard { 271 struct lwkt_msg nm_lmsg; 272 struct inpcb *nm_inp; 273 struct inpcbinfo *nm_pcbinfo; 274 }; 275 276 static int 277 in_pcbinswildcardhash_handler(struct lwkt_msg *msg0) 278 { 279 struct netmsg_inswildcard *msg = (struct netmsg_inswildcard *)msg0; 280 281 in_pcbinswildcardhash_oncpu(msg->nm_inp, msg->nm_pcbinfo); 282 lwkt_replymsg(&msg->nm_lmsg, 0); 283 return (EASYNC); 284 } 285 #endif 286 287 /* 288 * Prepare to accept connections. 289 */ 290 static int 291 tcp_usr_listen(struct socket *so, struct thread *td) 292 { 293 int s = splnet(); 294 int error = 0; 295 struct inpcb *inp = sotoinpcb(so); 296 struct tcpcb *tp; 297 #ifdef SMP 298 int cpu; 299 #endif 300 301 COMMON_START(); 302 if (inp->inp_lport == 0) { 303 error = in_pcbbind(inp, NULL, td); 304 if (error != 0) 305 goto out; 306 } 307 308 tp->t_state = TCPS_LISTEN; 309 #ifdef SMP 310 for (cpu = 0; cpu < ncpus2; cpu++) { 311 struct netmsg_inswildcard *msg; 312 313 if (cpu == mycpu->gd_cpuid) { 314 in_pcbinswildcardhash_oncpu(inp, &tcbinfo[cpu]); 315 continue; 316 } 317 318 msg = malloc(sizeof(struct netmsg_inswildcard), M_LWKTMSG, 319 M_INTWAIT); 320 lwkt_initmsg(&msg->nm_lmsg, &netisr_afree_rport, 0, 321 lwkt_cmd_func(in_pcbinswildcardhash_handler), 322 lwkt_cmd_op_none); 323 msg->nm_inp = inp; 324 msg->nm_pcbinfo = &tcbinfo[cpu]; 325 lwkt_sendmsg(tcp_cport(cpu), &msg->nm_lmsg); 326 } 327 inp->inp_flags |= INP_WILDCARD_MP; 328 #else 329 in_pcbinswildcardhash(inp); 330 #endif 331 COMMON_END(PRU_LISTEN); 332 } 333 334 #ifdef INET6 335 static int 336 tcp6_usr_listen(struct socket *so, struct thread *td) 337 { 338 int s = splnet(); 339 int error = 0; 340 struct inpcb *inp = sotoinpcb(so); 341 struct tcpcb *tp; 342 343 COMMON_START(); 344 if (inp->inp_lport == 0) { 345 inp->inp_vflag &= ~INP_IPV4; 346 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 347 inp->inp_vflag |= INP_IPV4; 348 error = in6_pcbbind(inp, (struct sockaddr *)0, td); 349 } 350 if (error == 0) 351 tp->t_state = TCPS_LISTEN; 352 in_pcbinswildcardhash(inp); 353 COMMON_END(PRU_LISTEN); 354 } 355 #endif /* INET6 */ 356 357 /* 358 * Initiate connection to peer. 359 * Create a template for use in transmissions on this connection. 360 * Enter SYN_SENT state, and mark socket as connecting. 361 * Start keep-alive timer, and seed output sequence space. 362 * Send initial segment on connection. 363 */ 364 static int 365 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 366 { 367 int s = splnet(); 368 int error = 0; 369 struct inpcb *inp = sotoinpcb(so); 370 struct tcpcb *tp; 371 struct sockaddr_in *sinp; 372 373 COMMON_START(); 374 375 /* 376 * Must disallow TCP ``connections'' to multicast addresses. 377 */ 378 sinp = (struct sockaddr_in *)nam; 379 if (sinp->sin_family == AF_INET 380 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 381 error = EAFNOSUPPORT; 382 goto out; 383 } 384 385 prison_remote_ip(td, 0, &sinp->sin_addr.s_addr); 386 387 if ((error = tcp_connect(tp, nam, td)) != 0) 388 goto out; 389 error = tcp_output(tp); 390 COMMON_END(PRU_CONNECT); 391 } 392 393 #ifdef INET6 394 static int 395 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 396 { 397 int s = splnet(); 398 int error = 0; 399 struct inpcb *inp = sotoinpcb(so); 400 struct tcpcb *tp; 401 struct sockaddr_in6 *sin6p; 402 403 COMMON_START(); 404 405 /* 406 * Must disallow TCP ``connections'' to multicast addresses. 407 */ 408 sin6p = (struct sockaddr_in6 *)nam; 409 if (sin6p->sin6_family == AF_INET6 410 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 411 error = EAFNOSUPPORT; 412 goto out; 413 } 414 415 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 416 struct sockaddr_in sin; 417 418 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 419 error = EINVAL; 420 goto out; 421 } 422 423 in6_sin6_2_sin(&sin, sin6p); 424 inp->inp_vflag |= INP_IPV4; 425 inp->inp_vflag &= ~INP_IPV6; 426 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 427 goto out; 428 error = tcp_output(tp); 429 goto out; 430 } 431 inp->inp_vflag &= ~INP_IPV4; 432 inp->inp_vflag |= INP_IPV6; 433 inp->inp_inc.inc_isipv6 = 1; 434 if ((error = tcp6_connect(tp, nam, td)) != 0) 435 goto out; 436 error = tcp_output(tp); 437 COMMON_END(PRU_CONNECT); 438 } 439 #endif /* INET6 */ 440 441 /* 442 * Initiate disconnect from peer. 443 * If connection never passed embryonic stage, just drop; 444 * else if don't need to let data drain, then can just drop anyways, 445 * else have to begin TCP shutdown process: mark socket disconnecting, 446 * drain unread data, state switch to reflect user close, and 447 * send segment (e.g. FIN) to peer. Socket will be really disconnected 448 * when peer sends FIN and acks ours. 449 * 450 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 451 */ 452 static int 453 tcp_usr_disconnect(struct socket *so) 454 { 455 int s = splnet(); 456 int error = 0; 457 struct inpcb *inp = sotoinpcb(so); 458 struct tcpcb *tp; 459 460 COMMON_START(); 461 tp = tcp_disconnect(tp); 462 COMMON_END(PRU_DISCONNECT); 463 } 464 465 /* 466 * Accept a connection. Essentially all the work is 467 * done at higher levels; just return the address 468 * of the peer, storing through addr. 469 */ 470 static int 471 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 472 { 473 int s = splnet(); 474 int error = 0; 475 struct inpcb *inp = sotoinpcb(so); 476 struct tcpcb *tp = NULL; 477 TCPDEBUG0; 478 479 if (so->so_state & SS_ISDISCONNECTED) { 480 error = ECONNABORTED; 481 goto out; 482 } 483 if (inp == 0) { 484 splx(s); 485 return (EINVAL); 486 } 487 tp = intotcpcb(inp); 488 TCPDEBUG1(); 489 in_setpeeraddr(so, nam); 490 COMMON_END(PRU_ACCEPT); 491 } 492 493 #ifdef INET6 494 static int 495 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 496 { 497 int s = splnet(); 498 int error = 0; 499 struct inpcb *inp = sotoinpcb(so); 500 struct tcpcb *tp = NULL; 501 TCPDEBUG0; 502 503 if (so->so_state & SS_ISDISCONNECTED) { 504 error = ECONNABORTED; 505 goto out; 506 } 507 if (inp == 0) { 508 splx(s); 509 return (EINVAL); 510 } 511 tp = intotcpcb(inp); 512 TCPDEBUG1(); 513 in6_mapped_peeraddr(so, nam); 514 COMMON_END(PRU_ACCEPT); 515 } 516 #endif /* INET6 */ 517 /* 518 * Mark the connection as being incapable of further output. 519 */ 520 static int 521 tcp_usr_shutdown(struct socket *so) 522 { 523 int s = splnet(); 524 int error = 0; 525 struct inpcb *inp = sotoinpcb(so); 526 struct tcpcb *tp; 527 528 COMMON_START(); 529 socantsendmore(so); 530 tp = tcp_usrclosed(tp); 531 if (tp) 532 error = tcp_output(tp); 533 COMMON_END(PRU_SHUTDOWN); 534 } 535 536 /* 537 * After a receive, possibly send window update to peer. 538 */ 539 static int 540 tcp_usr_rcvd(struct socket *so, int flags) 541 { 542 int s = splnet(); 543 int error = 0; 544 struct inpcb *inp = sotoinpcb(so); 545 struct tcpcb *tp; 546 547 COMMON_START(); 548 tcp_output(tp); 549 COMMON_END(PRU_RCVD); 550 } 551 552 /* 553 * Do a send by putting data in output queue and updating urgent 554 * marker if URG set. Possibly send more data. Unlike the other 555 * pru_*() routines, the mbuf chains are our responsibility. We 556 * must either enqueue them or free them. The other pru_* routines 557 * generally are caller-frees. 558 */ 559 static int 560 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 561 struct sockaddr *nam, struct mbuf *control, struct thread *td) 562 { 563 int s = splnet(); 564 int error = 0; 565 struct inpcb *inp = sotoinpcb(so); 566 struct tcpcb *tp; 567 #ifdef INET6 568 int isipv6; 569 #endif 570 TCPDEBUG0; 571 572 if (inp == NULL) { 573 /* 574 * OOPS! we lost a race, the TCP session got reset after 575 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a 576 * network interrupt in the non-splnet() section of sosend(). 577 */ 578 if (m) 579 m_freem(m); 580 if (control) 581 m_freem(control); 582 error = ECONNRESET; /* XXX EPIPE? */ 583 tp = NULL; 584 TCPDEBUG1(); 585 goto out; 586 } 587 #ifdef INET6 588 isipv6 = nam && nam->sa_family == AF_INET6; 589 #endif /* INET6 */ 590 tp = intotcpcb(inp); 591 TCPDEBUG1(); 592 if (control) { 593 /* TCP doesn't do control messages (rights, creds, etc) */ 594 if (control->m_len) { 595 m_freem(control); 596 if (m) 597 m_freem(m); 598 error = EINVAL; 599 goto out; 600 } 601 m_freem(control); /* empty control, just free it */ 602 } 603 if(!(flags & PRUS_OOB)) { 604 sbappend(&so->so_snd, m); 605 if (nam && tp->t_state < TCPS_SYN_SENT) { 606 /* 607 * Do implied connect if not yet connected, 608 * initialize window to default value, and 609 * initialize maxseg/maxopd using peer's cached 610 * MSS. 611 */ 612 #ifdef INET6 613 if (isipv6) 614 error = tcp6_connect(tp, nam, td); 615 else 616 #endif /* INET6 */ 617 error = tcp_connect(tp, nam, td); 618 if (error) 619 goto out; 620 tp->snd_wnd = TTCP_CLIENT_SND_WND; 621 tcp_mss(tp, -1); 622 } 623 624 if (flags & PRUS_EOF) { 625 /* 626 * Close the send side of the connection after 627 * the data is sent. 628 */ 629 socantsendmore(so); 630 tp = tcp_usrclosed(tp); 631 } 632 if (tp != NULL) { 633 if (flags & PRUS_MORETOCOME) 634 tp->t_flags |= TF_MORETOCOME; 635 error = tcp_output(tp); 636 if (flags & PRUS_MORETOCOME) 637 tp->t_flags &= ~TF_MORETOCOME; 638 } 639 } else { 640 if (sbspace(&so->so_snd) < -512) { 641 m_freem(m); 642 error = ENOBUFS; 643 goto out; 644 } 645 /* 646 * According to RFC961 (Assigned Protocols), 647 * the urgent pointer points to the last octet 648 * of urgent data. We continue, however, 649 * to consider it to indicate the first octet 650 * of data past the urgent section. 651 * Otherwise, snd_up should be one lower. 652 */ 653 sbappend(&so->so_snd, m); 654 if (nam && tp->t_state < TCPS_SYN_SENT) { 655 /* 656 * Do implied connect if not yet connected, 657 * initialize window to default value, and 658 * initialize maxseg/maxopd using peer's cached 659 * MSS. 660 */ 661 #ifdef INET6 662 if (isipv6) 663 error = tcp6_connect(tp, nam, td); 664 else 665 #endif /* INET6 */ 666 error = tcp_connect(tp, nam, td); 667 if (error) 668 goto out; 669 tp->snd_wnd = TTCP_CLIENT_SND_WND; 670 tcp_mss(tp, -1); 671 } 672 tp->snd_up = tp->snd_una + so->so_snd.sb_cc; 673 tp->t_force = 1; 674 error = tcp_output(tp); 675 tp->t_force = 0; 676 } 677 COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB : 678 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 679 } 680 681 /* 682 * Abort the TCP. 683 */ 684 static int 685 tcp_usr_abort(struct socket *so) 686 { 687 int s = splnet(); 688 int error = 0; 689 struct inpcb *inp = sotoinpcb(so); 690 struct tcpcb *tp; 691 692 COMMON_START(); 693 tp = tcp_drop(tp, ECONNABORTED); 694 COMMON_END(PRU_ABORT); 695 } 696 697 /* 698 * Receive out-of-band data. 699 */ 700 static int 701 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 702 { 703 int s = splnet(); 704 int error = 0; 705 struct inpcb *inp = sotoinpcb(so); 706 struct tcpcb *tp; 707 708 COMMON_START(); 709 if ((so->so_oobmark == 0 && 710 (so->so_state & SS_RCVATMARK) == 0) || 711 so->so_options & SO_OOBINLINE || 712 tp->t_oobflags & TCPOOB_HADDATA) { 713 error = EINVAL; 714 goto out; 715 } 716 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 717 error = EWOULDBLOCK; 718 goto out; 719 } 720 m->m_len = 1; 721 *mtod(m, caddr_t) = tp->t_iobc; 722 if ((flags & MSG_PEEK) == 0) 723 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 724 COMMON_END(PRU_RCVOOB); 725 } 726 727 /* xxx - should be const */ 728 struct pr_usrreqs tcp_usrreqs = { 729 tcp_usr_abort, tcp_usr_accept, tcp_usr_attach, tcp_usr_bind, 730 tcp_usr_connect, pru_connect2_notsupp, in_control, tcp_usr_detach, 731 tcp_usr_disconnect, tcp_usr_listen, in_setpeeraddr, tcp_usr_rcvd, 732 tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown, 733 in_setsockaddr, sosend, soreceive, sopoll 734 }; 735 736 #ifdef INET6 737 struct pr_usrreqs tcp6_usrreqs = { 738 tcp_usr_abort, tcp6_usr_accept, tcp_usr_attach, tcp6_usr_bind, 739 tcp6_usr_connect, pru_connect2_notsupp, in6_control, tcp_usr_detach, 740 tcp_usr_disconnect, tcp6_usr_listen, in6_mapped_peeraddr, tcp_usr_rcvd, 741 tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown, 742 in6_mapped_sockaddr, sosend, soreceive, sopoll 743 }; 744 #endif /* INET6 */ 745 746 static int 747 tcp_connect_oncpu(struct tcpcb *tp, struct sockaddr_in *sin, 748 struct sockaddr_in *if_sin) 749 { 750 struct inpcb *inp = tp->t_inpcb, *oinp; 751 struct socket *so = inp->inp_socket; 752 struct tcpcb *otp; 753 struct rmxp_tao *taop; 754 struct rmxp_tao tao_noncached; 755 756 oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid], 757 sin->sin_addr, sin->sin_port, 758 inp->inp_laddr.s_addr != INADDR_ANY ? 759 inp->inp_laddr : if_sin->sin_addr, 760 inp->inp_lport, 0, NULL); 761 if (oinp != NULL) { 762 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL && 763 otp->t_state == TCPS_TIME_WAIT && 764 (ticks - otp->t_starttime) < tcp_msl && 765 (otp->t_flags & TF_RCVD_CC)) 766 (void) tcp_close(otp); 767 else 768 return (EADDRINUSE); 769 } 770 if (inp->inp_laddr.s_addr == INADDR_ANY) 771 inp->inp_laddr = if_sin->sin_addr; 772 inp->inp_faddr = sin->sin_addr; 773 inp->inp_fport = sin->sin_port; 774 inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid]; 775 in_pcbinsconnhash(inp); 776 777 /* Compute window scaling to request. */ 778 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 779 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat) 780 tp->request_r_scale++; 781 782 soisconnecting(so); 783 tcpstat.tcps_connattempt++; 784 tp->t_state = TCPS_SYN_SENT; 785 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp); 786 tp->iss = tcp_new_isn(tp); 787 tp->t_bw_rtseq = tp->iss; 788 tcp_sendseqinit(tp); 789 790 /* 791 * Generate a CC value for this connection and 792 * check whether CC or CCnew should be used. 793 */ 794 if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) { 795 taop = &tao_noncached; 796 bzero(taop, sizeof(*taop)); 797 } 798 799 tp->cc_send = CC_INC(tcp_ccgen); 800 if (taop->tao_ccsent != 0 && 801 CC_GEQ(tp->cc_send, taop->tao_ccsent)) { 802 taop->tao_ccsent = tp->cc_send; 803 } else { 804 taop->tao_ccsent = 0; 805 tp->t_flags |= TF_SENDCCNEW; 806 } 807 808 return (0); 809 } 810 811 #ifdef SMP 812 813 struct netmsg_tcp_connect { 814 struct lwkt_msg nm_lmsg; 815 struct tcpcb *nm_tp; 816 struct sockaddr_in *nm_sin; 817 struct sockaddr_in *nm_ifsin; 818 }; 819 820 static int 821 tcp_connect_handler(lwkt_msg_t lmsg) 822 { 823 struct netmsg_tcp_connect *msg = (void *)lmsg; 824 int error; 825 826 error = tcp_connect_oncpu(msg->nm_tp, msg->nm_sin, msg->nm_ifsin); 827 lwkt_replymsg(lmsg, error); 828 return(EASYNC); 829 } 830 831 #endif 832 833 /* 834 * Common subroutine to open a TCP connection to remote host specified 835 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 836 * port number if needed. Call in_pcbladdr to do the routing and to choose 837 * a local host address (interface). If there is an existing incarnation 838 * of the same connection in TIME-WAIT state and if the remote host was 839 * sending CC options and if the connection duration was < MSL, then 840 * truncate the previous TIME-WAIT state and proceed. 841 * Initialize connection parameters and enter SYN-SENT state. 842 */ 843 static int 844 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 845 { 846 struct inpcb *inp = tp->t_inpcb; 847 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 848 struct sockaddr_in *if_sin; 849 int error; 850 #ifdef SMP 851 lwkt_port_t port; 852 #endif 853 854 if (inp->inp_lport == 0) { 855 error = in_pcbbind(inp, (struct sockaddr *)NULL, td); 856 if (error) 857 return (error); 858 } 859 860 /* 861 * Cannot simply call in_pcbconnect, because there might be an 862 * earlier incarnation of this same connection still in 863 * TIME_WAIT state, creating an ADDRINUSE error. 864 */ 865 error = in_pcbladdr(inp, nam, &if_sin); 866 if (error) 867 return (error); 868 869 #ifdef SMP 870 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port, 871 inp->inp_laddr.s_addr ? 872 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr, 873 inp->inp_lport); 874 875 if (port->mp_td != curthread) { 876 struct netmsg_tcp_connect msg; 877 878 lwkt_initmsg(&msg.nm_lmsg, &curthread->td_msgport, 0, 879 lwkt_cmd_func(tcp_connect_handler), lwkt_cmd_op_none); 880 msg.nm_tp = tp; 881 msg.nm_sin = sin; 882 msg.nm_ifsin = if_sin; 883 error = lwkt_domsg(port, &msg.nm_lmsg); 884 } else 885 #endif 886 error = tcp_connect_oncpu(tp, sin, if_sin); 887 888 return (error); 889 } 890 891 #ifdef INET6 892 static int 893 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 894 { 895 struct inpcb *inp = tp->t_inpcb, *oinp; 896 struct socket *so = inp->inp_socket; 897 struct tcpcb *otp; 898 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 899 struct in6_addr *addr6; 900 struct rmxp_tao *taop; 901 struct rmxp_tao tao_noncached; 902 int error; 903 904 if (inp->inp_lport == 0) { 905 error = in6_pcbbind(inp, (struct sockaddr *)0, td); 906 if (error) 907 return error; 908 } 909 910 /* 911 * Cannot simply call in_pcbconnect, because there might be an 912 * earlier incarnation of this same connection still in 913 * TIME_WAIT state, creating an ADDRINUSE error. 914 */ 915 error = in6_pcbladdr(inp, nam, &addr6); 916 if (error) 917 return error; 918 oinp = in6_pcblookup_hash(inp->inp_cpcbinfo, 919 &sin6->sin6_addr, sin6->sin6_port, 920 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ? 921 addr6 : &inp->in6p_laddr, 922 inp->inp_lport, 0, NULL); 923 if (oinp) { 924 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL && 925 otp->t_state == TCPS_TIME_WAIT && 926 (ticks - otp->t_starttime) < tcp_msl && 927 (otp->t_flags & TF_RCVD_CC)) 928 otp = tcp_close(otp); 929 else 930 return (EADDRINUSE); 931 } 932 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 933 inp->in6p_laddr = *addr6; 934 inp->in6p_faddr = sin6->sin6_addr; 935 inp->inp_fport = sin6->sin6_port; 936 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != NULL) 937 inp->in6p_flowinfo = sin6->sin6_flowinfo; 938 in_pcbinsconnhash(inp); 939 940 /* Compute window scaling to request. */ 941 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 942 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat) 943 tp->request_r_scale++; 944 945 soisconnecting(so); 946 tcpstat.tcps_connattempt++; 947 tp->t_state = TCPS_SYN_SENT; 948 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp); 949 tp->iss = tcp_new_isn(tp); 950 tp->t_bw_rtseq = tp->iss; 951 tcp_sendseqinit(tp); 952 953 /* 954 * Generate a CC value for this connection and 955 * check whether CC or CCnew should be used. 956 */ 957 if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) { 958 taop = &tao_noncached; 959 bzero(taop, sizeof(*taop)); 960 } 961 962 tp->cc_send = CC_INC(tcp_ccgen); 963 if (taop->tao_ccsent != 0 && 964 CC_GEQ(tp->cc_send, taop->tao_ccsent)) { 965 taop->tao_ccsent = tp->cc_send; 966 } else { 967 taop->tao_ccsent = 0; 968 tp->t_flags |= TF_SENDCCNEW; 969 } 970 971 return (0); 972 } 973 #endif /* INET6 */ 974 975 /* 976 * The new sockopt interface makes it possible for us to block in the 977 * copyin/out step (if we take a page fault). Taking a page fault at 978 * splnet() is probably a Bad Thing. (Since sockets and pcbs both now 979 * use TSM, there probably isn't any need for this function to run at 980 * splnet() any more. This needs more examination.) 981 */ 982 int 983 tcp_ctloutput(so, sopt) 984 struct socket *so; 985 struct sockopt *sopt; 986 { 987 int error, opt, optval, s; 988 struct inpcb *inp; 989 struct tcpcb *tp; 990 991 error = 0; 992 s = splnet(); /* XXX */ 993 inp = sotoinpcb(so); 994 if (inp == NULL) { 995 splx(s); 996 return (ECONNRESET); 997 } 998 if (sopt->sopt_level != IPPROTO_TCP) { 999 #ifdef INET6 1000 if (INP_CHECK_SOCKAF(so, AF_INET6)) 1001 error = ip6_ctloutput(so, sopt); 1002 else 1003 #endif /* INET6 */ 1004 error = ip_ctloutput(so, sopt); 1005 splx(s); 1006 return (error); 1007 } 1008 tp = intotcpcb(inp); 1009 1010 switch (sopt->sopt_dir) { 1011 case SOPT_SET: 1012 switch (sopt->sopt_name) { 1013 case TCP_NODELAY: 1014 case TCP_NOOPT: 1015 error = sooptcopyin(sopt, &optval, sizeof optval, 1016 sizeof optval); 1017 if (error) 1018 break; 1019 1020 switch (sopt->sopt_name) { 1021 case TCP_NODELAY: 1022 opt = TF_NODELAY; 1023 break; 1024 case TCP_NOOPT: 1025 opt = TF_NOOPT; 1026 break; 1027 default: 1028 opt = 0; /* dead code to fool gcc */ 1029 break; 1030 } 1031 1032 if (optval) 1033 tp->t_flags |= opt; 1034 else 1035 tp->t_flags &= ~opt; 1036 break; 1037 1038 case TCP_NOPUSH: 1039 error = sooptcopyin(sopt, &optval, sizeof optval, 1040 sizeof optval); 1041 if (error) 1042 break; 1043 1044 if (optval) 1045 tp->t_flags |= TF_NOPUSH; 1046 else { 1047 tp->t_flags &= ~TF_NOPUSH; 1048 error = tcp_output(tp); 1049 } 1050 break; 1051 1052 case TCP_MAXSEG: 1053 error = sooptcopyin(sopt, &optval, sizeof optval, 1054 sizeof optval); 1055 if (error) 1056 break; 1057 1058 if (optval > 0 && optval <= tp->t_maxseg) 1059 tp->t_maxseg = optval; 1060 else 1061 error = EINVAL; 1062 break; 1063 1064 default: 1065 error = ENOPROTOOPT; 1066 break; 1067 } 1068 break; 1069 1070 case SOPT_GET: 1071 switch (sopt->sopt_name) { 1072 case TCP_NODELAY: 1073 optval = tp->t_flags & TF_NODELAY; 1074 break; 1075 case TCP_MAXSEG: 1076 optval = tp->t_maxseg; 1077 break; 1078 case TCP_NOOPT: 1079 optval = tp->t_flags & TF_NOOPT; 1080 break; 1081 case TCP_NOPUSH: 1082 optval = tp->t_flags & TF_NOPUSH; 1083 break; 1084 default: 1085 error = ENOPROTOOPT; 1086 break; 1087 } 1088 if (error == 0) 1089 error = sooptcopyout(sopt, &optval, sizeof optval); 1090 break; 1091 } 1092 splx(s); 1093 return (error); 1094 } 1095 1096 /* 1097 * tcp_sendspace and tcp_recvspace are the default send and receive window 1098 * sizes, respectively. These are obsolescent (this information should 1099 * be set by the route). 1100 */ 1101 u_long tcp_sendspace = 1024*32; 1102 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, 1103 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); 1104 u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ 1105 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 1106 &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); 1107 1108 /* 1109 * Attach TCP protocol to socket, allocating 1110 * internet protocol control block, tcp control block, 1111 * bufer space, and entering LISTEN state if to accept connections. 1112 */ 1113 static int 1114 tcp_attach(struct socket *so, struct pru_attach_info *ai) 1115 { 1116 struct tcpcb *tp; 1117 struct inpcb *inp; 1118 int error; 1119 int cpu; 1120 #ifdef INET6 1121 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != NULL; 1122 #endif 1123 1124 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1125 error = soreserve(so, tcp_sendspace, tcp_recvspace, 1126 ai->sb_rlimit); 1127 if (error) 1128 return (error); 1129 } 1130 cpu = mycpu->gd_cpuid; 1131 error = in_pcballoc(so, &tcbinfo[cpu]); 1132 if (error) 1133 return (error); 1134 inp = sotoinpcb(so); 1135 #ifdef INET6 1136 if (isipv6) { 1137 inp->inp_vflag |= INP_IPV6; 1138 inp->in6p_hops = -1; /* use kernel default */ 1139 } 1140 else 1141 #endif 1142 inp->inp_vflag |= INP_IPV4; 1143 tp = tcp_newtcpcb(inp); 1144 if (tp == 0) { 1145 int nofd = so->so_state & SS_NOFDREF; /* XXX */ 1146 1147 so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */ 1148 #ifdef INET6 1149 if (isipv6) 1150 in6_pcbdetach(inp); 1151 else 1152 #endif 1153 in_pcbdetach(inp); 1154 so->so_state |= nofd; 1155 return (ENOBUFS); 1156 } 1157 tp->t_state = TCPS_CLOSED; 1158 return (0); 1159 } 1160 1161 /* 1162 * Initiate (or continue) disconnect. 1163 * If embryonic state, just send reset (once). 1164 * If in ``let data drain'' option and linger null, just drop. 1165 * Otherwise (hard), mark socket disconnecting and drop 1166 * current input data; switch states based on user close, and 1167 * send segment to peer (with FIN). 1168 */ 1169 static struct tcpcb * 1170 tcp_disconnect(tp) 1171 struct tcpcb *tp; 1172 { 1173 struct socket *so = tp->t_inpcb->inp_socket; 1174 1175 if (tp->t_state < TCPS_ESTABLISHED) 1176 tp = tcp_close(tp); 1177 else if ((so->so_options & SO_LINGER) && so->so_linger == 0) 1178 tp = tcp_drop(tp, 0); 1179 else { 1180 soisdisconnecting(so); 1181 sbflush(&so->so_rcv); 1182 tp = tcp_usrclosed(tp); 1183 if (tp) 1184 (void) tcp_output(tp); 1185 } 1186 return (tp); 1187 } 1188 1189 /* 1190 * User issued close, and wish to trail through shutdown states: 1191 * if never received SYN, just forget it. If got a SYN from peer, 1192 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1193 * If already got a FIN from peer, then almost done; go to LAST_ACK 1194 * state. In all other cases, have already sent FIN to peer (e.g. 1195 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1196 * for peer to send FIN or not respond to keep-alives, etc. 1197 * We can let the user exit from the close as soon as the FIN is acked. 1198 */ 1199 static struct tcpcb * 1200 tcp_usrclosed(tp) 1201 struct tcpcb *tp; 1202 { 1203 1204 switch (tp->t_state) { 1205 1206 case TCPS_CLOSED: 1207 case TCPS_LISTEN: 1208 tp->t_state = TCPS_CLOSED; 1209 tp = tcp_close(tp); 1210 break; 1211 1212 case TCPS_SYN_SENT: 1213 case TCPS_SYN_RECEIVED: 1214 tp->t_flags |= TF_NEEDFIN; 1215 break; 1216 1217 case TCPS_ESTABLISHED: 1218 tp->t_state = TCPS_FIN_WAIT_1; 1219 break; 1220 1221 case TCPS_CLOSE_WAIT: 1222 tp->t_state = TCPS_LAST_ACK; 1223 break; 1224 } 1225 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) { 1226 soisdisconnected(tp->t_inpcb->inp_socket); 1227 /* To prevent the connection hanging in FIN_WAIT_2 forever. */ 1228 if (tp->t_state == TCPS_FIN_WAIT_2) 1229 callout_reset(tp->tt_2msl, tcp_maxidle, 1230 tcp_timer_2msl, tp); 1231 } 1232 return (tp); 1233 } 1234