1 /* 2 * Copyright (c) 2003-2004 Jeffrey M. Hsu. All rights reserved. 3 * Copyright (c) 1982, 1986, 1988, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94 35 * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.17 2002/10/11 11:46:44 ume Exp $ 36 * $DragonFly: src/sys/netinet/tcp_usrreq.c,v 1.24 2004/07/02 04:41:01 hsu Exp $ 37 */ 38 39 #include "opt_ipsec.h" 40 #include "opt_inet6.h" 41 #include "opt_tcpdebug.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/kernel.h> 46 #include <sys/malloc.h> 47 #include <sys/sysctl.h> 48 #include <sys/globaldata.h> 49 #include <sys/thread.h> 50 51 #include <sys/mbuf.h> 52 #ifdef INET6 53 #include <sys/domain.h> 54 #endif /* INET6 */ 55 #include <sys/socket.h> 56 #include <sys/socketvar.h> 57 #include <sys/protosw.h> 58 59 #include <sys/msgport2.h> 60 61 #include <net/if.h> 62 #include <net/netisr.h> 63 #include <net/route.h> 64 65 #include <netinet/in.h> 66 #include <netinet/in_systm.h> 67 #ifdef INET6 68 #include <netinet/ip6.h> 69 #endif 70 #include <netinet/in_pcb.h> 71 #ifdef INET6 72 #include <netinet6/in6_pcb.h> 73 #endif 74 #include <netinet/in_var.h> 75 #include <netinet/ip_var.h> 76 #ifdef INET6 77 #include <netinet6/ip6_var.h> 78 #endif 79 #include <netinet/tcp.h> 80 #include <netinet/tcp_fsm.h> 81 #include <netinet/tcp_seq.h> 82 #include <netinet/tcp_timer.h> 83 #include <netinet/tcp_var.h> 84 #include <netinet/tcpip.h> 85 #ifdef TCPDEBUG 86 #include <netinet/tcp_debug.h> 87 #endif 88 89 #ifdef IPSEC 90 #include <netinet6/ipsec.h> 91 #endif /*IPSEC*/ 92 93 /* 94 * TCP protocol interface to socket abstraction. 95 */ 96 extern char *tcpstates[]; /* XXX ??? */ 97 98 static int tcp_attach (struct socket *, struct pru_attach_info *); 99 static int tcp_connect (struct tcpcb *, struct sockaddr *, 100 struct thread *); 101 #ifdef INET6 102 static int tcp6_connect (struct tcpcb *, struct sockaddr *, 103 struct thread *); 104 #endif /* INET6 */ 105 static struct tcpcb * 106 tcp_disconnect (struct tcpcb *); 107 static struct tcpcb * 108 tcp_usrclosed (struct tcpcb *); 109 110 #ifdef TCPDEBUG 111 #define TCPDEBUG0 int ostate = 0 112 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 113 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 114 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 115 #else 116 #define TCPDEBUG0 117 #define TCPDEBUG1() 118 #define TCPDEBUG2(req) 119 #endif 120 121 /* 122 * TCP attaches to socket via pru_attach(), reserving space, 123 * and an internet control block. 124 */ 125 static int 126 tcp_usr_attach(struct socket *so, int proto, struct pru_attach_info *ai) 127 { 128 int s = splnet(); 129 int error; 130 struct inpcb *inp = sotoinpcb(so); 131 struct tcpcb *tp = 0; 132 TCPDEBUG0; 133 134 TCPDEBUG1(); 135 if (inp) { 136 error = EISCONN; 137 goto out; 138 } 139 140 error = tcp_attach(so, ai); 141 if (error) 142 goto out; 143 144 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 145 so->so_linger = TCP_LINGERTIME; 146 tp = sototcpcb(so); 147 out: 148 TCPDEBUG2(PRU_ATTACH); 149 splx(s); 150 return error; 151 } 152 153 /* 154 * pru_detach() detaches the TCP protocol from the socket. 155 * If the protocol state is non-embryonic, then can't 156 * do this directly: have to initiate a pru_disconnect(), 157 * which may finish later; embryonic TCB's can just 158 * be discarded here. 159 */ 160 static int 161 tcp_usr_detach(struct socket *so) 162 { 163 int s = splnet(); 164 int error = 0; 165 struct inpcb *inp = sotoinpcb(so); 166 struct tcpcb *tp; 167 TCPDEBUG0; 168 169 if (inp == 0) { 170 splx(s); 171 return EINVAL; /* XXX */ 172 } 173 tp = intotcpcb(inp); 174 TCPDEBUG1(); 175 tp = tcp_disconnect(tp); 176 177 TCPDEBUG2(PRU_DETACH); 178 splx(s); 179 return error; 180 } 181 182 #define COMMON_START() TCPDEBUG0; \ 183 do { \ 184 if (inp == 0) { \ 185 splx(s); \ 186 return EINVAL; \ 187 } \ 188 tp = intotcpcb(inp); \ 189 TCPDEBUG1(); \ 190 } while(0) 191 192 #define COMMON_END(req) out: TCPDEBUG2(req); splx(s); return error; goto out 193 194 195 /* 196 * Give the socket an address. 197 */ 198 static int 199 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 200 { 201 int s = splnet(); 202 int error = 0; 203 struct inpcb *inp = sotoinpcb(so); 204 struct tcpcb *tp; 205 struct sockaddr_in *sinp; 206 207 COMMON_START(); 208 209 /* 210 * Must check for multicast addresses and disallow binding 211 * to them. 212 */ 213 sinp = (struct sockaddr_in *)nam; 214 if (sinp->sin_family == AF_INET && 215 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 216 error = EAFNOSUPPORT; 217 goto out; 218 } 219 error = in_pcbbind(inp, nam, td); 220 if (error) 221 goto out; 222 COMMON_END(PRU_BIND); 223 224 } 225 226 #ifdef INET6 227 static int 228 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 229 { 230 int s = splnet(); 231 int error = 0; 232 struct inpcb *inp = sotoinpcb(so); 233 struct tcpcb *tp; 234 struct sockaddr_in6 *sin6p; 235 236 COMMON_START(); 237 238 /* 239 * Must check for multicast addresses and disallow binding 240 * to them. 241 */ 242 sin6p = (struct sockaddr_in6 *)nam; 243 if (sin6p->sin6_family == AF_INET6 && 244 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 245 error = EAFNOSUPPORT; 246 goto out; 247 } 248 inp->inp_vflag &= ~INP_IPV4; 249 inp->inp_vflag |= INP_IPV6; 250 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 251 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 252 inp->inp_vflag |= INP_IPV4; 253 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 254 struct sockaddr_in sin; 255 256 in6_sin6_2_sin(&sin, sin6p); 257 inp->inp_vflag |= INP_IPV4; 258 inp->inp_vflag &= ~INP_IPV6; 259 error = in_pcbbind(inp, (struct sockaddr *)&sin, td); 260 goto out; 261 } 262 } 263 error = in6_pcbbind(inp, nam, td); 264 if (error) 265 goto out; 266 COMMON_END(PRU_BIND); 267 } 268 #endif /* INET6 */ 269 270 #ifdef SMP 271 struct netmsg_inswildcard { 272 struct lwkt_msg nm_lmsg; 273 struct inpcb *nm_inp; 274 struct inpcbinfo *nm_pcbinfo; 275 }; 276 277 static int 278 in_pcbinswildcardhash_handler(struct lwkt_msg *msg0) 279 { 280 struct netmsg_inswildcard *msg = (struct netmsg_inswildcard *)msg0; 281 282 in_pcbinswildcardhash_oncpu(msg->nm_inp, msg->nm_pcbinfo); 283 lwkt_replymsg(&msg->nm_lmsg, 0); 284 return (EASYNC); 285 } 286 #endif 287 288 /* 289 * Prepare to accept connections. 290 */ 291 static int 292 tcp_usr_listen(struct socket *so, struct thread *td) 293 { 294 int s = splnet(); 295 int error = 0; 296 struct inpcb *inp = sotoinpcb(so); 297 struct tcpcb *tp; 298 #ifdef SMP 299 int cpu; 300 #endif 301 302 COMMON_START(); 303 if (inp->inp_lport == 0) { 304 error = in_pcbbind(inp, NULL, td); 305 if (error != 0) 306 goto out; 307 } 308 309 tp->t_state = TCPS_LISTEN; 310 #ifdef SMP 311 for (cpu = 0; cpu < ncpus2; cpu++) { 312 struct netmsg_inswildcard *msg; 313 314 if (cpu == mycpu->gd_cpuid) { 315 in_pcbinswildcardhash_oncpu(inp, &tcbinfo[cpu]); 316 continue; 317 } 318 319 msg = malloc(sizeof(struct netmsg_inswildcard), M_LWKTMSG, 320 M_INTWAIT); 321 lwkt_initmsg(&msg->nm_lmsg, &netisr_afree_rport, 0, 322 lwkt_cmd_func(in_pcbinswildcardhash_handler), 323 lwkt_cmd_op_none); 324 msg->nm_inp = inp; 325 msg->nm_pcbinfo = &tcbinfo[cpu]; 326 lwkt_sendmsg(tcp_cport(cpu), &msg->nm_lmsg); 327 } 328 inp->inp_flags |= INP_WILDCARD_MP; 329 #else 330 in_pcbinswildcardhash(inp); 331 #endif 332 COMMON_END(PRU_LISTEN); 333 } 334 335 #ifdef INET6 336 static int 337 tcp6_usr_listen(struct socket *so, struct thread *td) 338 { 339 int s = splnet(); 340 int error = 0; 341 struct inpcb *inp = sotoinpcb(so); 342 struct tcpcb *tp; 343 344 COMMON_START(); 345 if (inp->inp_lport == 0) { 346 inp->inp_vflag &= ~INP_IPV4; 347 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 348 inp->inp_vflag |= INP_IPV4; 349 error = in6_pcbbind(inp, (struct sockaddr *)0, td); 350 } 351 if (error == 0) 352 tp->t_state = TCPS_LISTEN; 353 in_pcbinswildcardhash(inp); 354 COMMON_END(PRU_LISTEN); 355 } 356 #endif /* INET6 */ 357 358 /* 359 * Initiate connection to peer. 360 * Create a template for use in transmissions on this connection. 361 * Enter SYN_SENT state, and mark socket as connecting. 362 * Start keep-alive timer, and seed output sequence space. 363 * Send initial segment on connection. 364 */ 365 static int 366 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 367 { 368 int s = splnet(); 369 int error = 0; 370 struct inpcb *inp = sotoinpcb(so); 371 struct tcpcb *tp; 372 struct sockaddr_in *sinp; 373 374 COMMON_START(); 375 376 /* 377 * Must disallow TCP ``connections'' to multicast addresses. 378 */ 379 sinp = (struct sockaddr_in *)nam; 380 if (sinp->sin_family == AF_INET 381 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 382 error = EAFNOSUPPORT; 383 goto out; 384 } 385 386 prison_remote_ip(td, 0, &sinp->sin_addr.s_addr); 387 388 if ((error = tcp_connect(tp, nam, td)) != 0) 389 goto out; 390 error = tcp_output(tp); 391 COMMON_END(PRU_CONNECT); 392 } 393 394 #ifdef INET6 395 static int 396 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 397 { 398 int s = splnet(); 399 int error = 0; 400 struct inpcb *inp = sotoinpcb(so); 401 struct tcpcb *tp; 402 struct sockaddr_in6 *sin6p; 403 404 COMMON_START(); 405 406 /* 407 * Must disallow TCP ``connections'' to multicast addresses. 408 */ 409 sin6p = (struct sockaddr_in6 *)nam; 410 if (sin6p->sin6_family == AF_INET6 411 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 412 error = EAFNOSUPPORT; 413 goto out; 414 } 415 416 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 417 struct sockaddr_in sin; 418 419 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 420 error = EINVAL; 421 goto out; 422 } 423 424 in6_sin6_2_sin(&sin, sin6p); 425 inp->inp_vflag |= INP_IPV4; 426 inp->inp_vflag &= ~INP_IPV6; 427 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 428 goto out; 429 error = tcp_output(tp); 430 goto out; 431 } 432 inp->inp_vflag &= ~INP_IPV4; 433 inp->inp_vflag |= INP_IPV6; 434 inp->inp_inc.inc_isipv6 = 1; 435 if ((error = tcp6_connect(tp, nam, td)) != 0) 436 goto out; 437 error = tcp_output(tp); 438 COMMON_END(PRU_CONNECT); 439 } 440 #endif /* INET6 */ 441 442 /* 443 * Initiate disconnect from peer. 444 * If connection never passed embryonic stage, just drop; 445 * else if don't need to let data drain, then can just drop anyways, 446 * else have to begin TCP shutdown process: mark socket disconnecting, 447 * drain unread data, state switch to reflect user close, and 448 * send segment (e.g. FIN) to peer. Socket will be really disconnected 449 * when peer sends FIN and acks ours. 450 * 451 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 452 */ 453 static int 454 tcp_usr_disconnect(struct socket *so) 455 { 456 int s = splnet(); 457 int error = 0; 458 struct inpcb *inp = sotoinpcb(so); 459 struct tcpcb *tp; 460 461 COMMON_START(); 462 tp = tcp_disconnect(tp); 463 COMMON_END(PRU_DISCONNECT); 464 } 465 466 /* 467 * Accept a connection. Essentially all the work is 468 * done at higher levels; just return the address 469 * of the peer, storing through addr. 470 */ 471 static int 472 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 473 { 474 int s = splnet(); 475 int error = 0; 476 struct inpcb *inp = sotoinpcb(so); 477 struct tcpcb *tp = NULL; 478 TCPDEBUG0; 479 480 if (so->so_state & SS_ISDISCONNECTED) { 481 error = ECONNABORTED; 482 goto out; 483 } 484 if (inp == 0) { 485 splx(s); 486 return (EINVAL); 487 } 488 tp = intotcpcb(inp); 489 TCPDEBUG1(); 490 in_setpeeraddr(so, nam); 491 COMMON_END(PRU_ACCEPT); 492 } 493 494 #ifdef INET6 495 static int 496 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 497 { 498 int s = splnet(); 499 int error = 0; 500 struct inpcb *inp = sotoinpcb(so); 501 struct tcpcb *tp = NULL; 502 TCPDEBUG0; 503 504 if (so->so_state & SS_ISDISCONNECTED) { 505 error = ECONNABORTED; 506 goto out; 507 } 508 if (inp == 0) { 509 splx(s); 510 return (EINVAL); 511 } 512 tp = intotcpcb(inp); 513 TCPDEBUG1(); 514 in6_mapped_peeraddr(so, nam); 515 COMMON_END(PRU_ACCEPT); 516 } 517 #endif /* INET6 */ 518 /* 519 * Mark the connection as being incapable of further output. 520 */ 521 static int 522 tcp_usr_shutdown(struct socket *so) 523 { 524 int s = splnet(); 525 int error = 0; 526 struct inpcb *inp = sotoinpcb(so); 527 struct tcpcb *tp; 528 529 COMMON_START(); 530 socantsendmore(so); 531 tp = tcp_usrclosed(tp); 532 if (tp) 533 error = tcp_output(tp); 534 COMMON_END(PRU_SHUTDOWN); 535 } 536 537 /* 538 * After a receive, possibly send window update to peer. 539 */ 540 static int 541 tcp_usr_rcvd(struct socket *so, int flags) 542 { 543 int s = splnet(); 544 int error = 0; 545 struct inpcb *inp = sotoinpcb(so); 546 struct tcpcb *tp; 547 548 COMMON_START(); 549 tcp_output(tp); 550 COMMON_END(PRU_RCVD); 551 } 552 553 /* 554 * Do a send by putting data in output queue and updating urgent 555 * marker if URG set. Possibly send more data. Unlike the other 556 * pru_*() routines, the mbuf chains are our responsibility. We 557 * must either enqueue them or free them. The other pru_* routines 558 * generally are caller-frees. 559 */ 560 static int 561 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 562 struct sockaddr *nam, struct mbuf *control, struct thread *td) 563 { 564 int s = splnet(); 565 int error = 0; 566 struct inpcb *inp = sotoinpcb(so); 567 struct tcpcb *tp; 568 #ifdef INET6 569 int isipv6; 570 #endif 571 TCPDEBUG0; 572 573 if (inp == NULL) { 574 /* 575 * OOPS! we lost a race, the TCP session got reset after 576 * we checked SS_CANTSENDMORE, eg: while doing uiomove or a 577 * network interrupt in the non-splnet() section of sosend(). 578 */ 579 if (m) 580 m_freem(m); 581 if (control) 582 m_freem(control); 583 error = ECONNRESET; /* XXX EPIPE? */ 584 tp = NULL; 585 TCPDEBUG1(); 586 goto out; 587 } 588 #ifdef INET6 589 isipv6 = nam && nam->sa_family == AF_INET6; 590 #endif /* INET6 */ 591 tp = intotcpcb(inp); 592 TCPDEBUG1(); 593 if (control) { 594 /* TCP doesn't do control messages (rights, creds, etc) */ 595 if (control->m_len) { 596 m_freem(control); 597 if (m) 598 m_freem(m); 599 error = EINVAL; 600 goto out; 601 } 602 m_freem(control); /* empty control, just free it */ 603 } 604 if(!(flags & PRUS_OOB)) { 605 sbappend(&so->so_snd, m); 606 if (nam && tp->t_state < TCPS_SYN_SENT) { 607 /* 608 * Do implied connect if not yet connected, 609 * initialize window to default value, and 610 * initialize maxseg/maxopd using peer's cached 611 * MSS. 612 */ 613 #ifdef INET6 614 if (isipv6) 615 error = tcp6_connect(tp, nam, td); 616 else 617 #endif /* INET6 */ 618 error = tcp_connect(tp, nam, td); 619 if (error) 620 goto out; 621 tp->snd_wnd = TTCP_CLIENT_SND_WND; 622 tcp_mss(tp, -1); 623 } 624 625 if (flags & PRUS_EOF) { 626 /* 627 * Close the send side of the connection after 628 * the data is sent. 629 */ 630 socantsendmore(so); 631 tp = tcp_usrclosed(tp); 632 } 633 if (tp != NULL) { 634 if (flags & PRUS_MORETOCOME) 635 tp->t_flags |= TF_MORETOCOME; 636 error = tcp_output(tp); 637 if (flags & PRUS_MORETOCOME) 638 tp->t_flags &= ~TF_MORETOCOME; 639 } 640 } else { 641 if (sbspace(&so->so_snd) < -512) { 642 m_freem(m); 643 error = ENOBUFS; 644 goto out; 645 } 646 /* 647 * According to RFC961 (Assigned Protocols), 648 * the urgent pointer points to the last octet 649 * of urgent data. We continue, however, 650 * to consider it to indicate the first octet 651 * of data past the urgent section. 652 * Otherwise, snd_up should be one lower. 653 */ 654 sbappend(&so->so_snd, m); 655 if (nam && tp->t_state < TCPS_SYN_SENT) { 656 /* 657 * Do implied connect if not yet connected, 658 * initialize window to default value, and 659 * initialize maxseg/maxopd using peer's cached 660 * MSS. 661 */ 662 #ifdef INET6 663 if (isipv6) 664 error = tcp6_connect(tp, nam, td); 665 else 666 #endif /* INET6 */ 667 error = tcp_connect(tp, nam, td); 668 if (error) 669 goto out; 670 tp->snd_wnd = TTCP_CLIENT_SND_WND; 671 tcp_mss(tp, -1); 672 } 673 tp->snd_up = tp->snd_una + so->so_snd.sb_cc; 674 tp->t_flags |= TF_FORCE; 675 error = tcp_output(tp); 676 tp->t_flags &= ~TF_FORCE; 677 } 678 COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB : 679 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 680 } 681 682 /* 683 * Abort the TCP. 684 */ 685 static int 686 tcp_usr_abort(struct socket *so) 687 { 688 int s = splnet(); 689 int error = 0; 690 struct inpcb *inp = sotoinpcb(so); 691 struct tcpcb *tp; 692 693 COMMON_START(); 694 tp = tcp_drop(tp, ECONNABORTED); 695 COMMON_END(PRU_ABORT); 696 } 697 698 /* 699 * Receive out-of-band data. 700 */ 701 static int 702 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 703 { 704 int s = splnet(); 705 int error = 0; 706 struct inpcb *inp = sotoinpcb(so); 707 struct tcpcb *tp; 708 709 COMMON_START(); 710 if ((so->so_oobmark == 0 && 711 (so->so_state & SS_RCVATMARK) == 0) || 712 so->so_options & SO_OOBINLINE || 713 tp->t_oobflags & TCPOOB_HADDATA) { 714 error = EINVAL; 715 goto out; 716 } 717 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 718 error = EWOULDBLOCK; 719 goto out; 720 } 721 m->m_len = 1; 722 *mtod(m, caddr_t) = tp->t_iobc; 723 if ((flags & MSG_PEEK) == 0) 724 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 725 COMMON_END(PRU_RCVOOB); 726 } 727 728 /* xxx - should be const */ 729 struct pr_usrreqs tcp_usrreqs = { 730 tcp_usr_abort, tcp_usr_accept, tcp_usr_attach, tcp_usr_bind, 731 tcp_usr_connect, pru_connect2_notsupp, in_control, tcp_usr_detach, 732 tcp_usr_disconnect, tcp_usr_listen, in_setpeeraddr, tcp_usr_rcvd, 733 tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown, 734 in_setsockaddr, sosend, soreceive, sopoll 735 }; 736 737 #ifdef INET6 738 struct pr_usrreqs tcp6_usrreqs = { 739 tcp_usr_abort, tcp6_usr_accept, tcp_usr_attach, tcp6_usr_bind, 740 tcp6_usr_connect, pru_connect2_notsupp, in6_control, tcp_usr_detach, 741 tcp_usr_disconnect, tcp6_usr_listen, in6_mapped_peeraddr, tcp_usr_rcvd, 742 tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown, 743 in6_mapped_sockaddr, sosend, soreceive, sopoll 744 }; 745 #endif /* INET6 */ 746 747 static int 748 tcp_connect_oncpu(struct tcpcb *tp, struct sockaddr_in *sin, 749 struct sockaddr_in *if_sin) 750 { 751 struct inpcb *inp = tp->t_inpcb, *oinp; 752 struct socket *so = inp->inp_socket; 753 struct tcpcb *otp; 754 struct rmxp_tao *taop; 755 struct rmxp_tao tao_noncached; 756 757 oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid], 758 sin->sin_addr, sin->sin_port, 759 inp->inp_laddr.s_addr != INADDR_ANY ? 760 inp->inp_laddr : if_sin->sin_addr, 761 inp->inp_lport, 0, NULL); 762 if (oinp != NULL) { 763 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL && 764 otp->t_state == TCPS_TIME_WAIT && 765 (ticks - otp->t_starttime) < tcp_msl && 766 (otp->t_flags & TF_RCVD_CC)) 767 (void) tcp_close(otp); 768 else 769 return (EADDRINUSE); 770 } 771 if (inp->inp_laddr.s_addr == INADDR_ANY) 772 inp->inp_laddr = if_sin->sin_addr; 773 inp->inp_faddr = sin->sin_addr; 774 inp->inp_fport = sin->sin_port; 775 inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid]; 776 in_pcbinsconnhash(inp); 777 778 /* Compute window scaling to request. */ 779 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 780 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat) 781 tp->request_r_scale++; 782 783 soisconnecting(so); 784 tcpstat.tcps_connattempt++; 785 tp->t_state = TCPS_SYN_SENT; 786 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp); 787 tp->iss = tcp_new_isn(tp); 788 tp->t_bw_rtseq = tp->iss; 789 tcp_sendseqinit(tp); 790 791 /* 792 * Generate a CC value for this connection and 793 * check whether CC or CCnew should be used. 794 */ 795 if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) { 796 taop = &tao_noncached; 797 bzero(taop, sizeof(*taop)); 798 } 799 800 tp->cc_send = CC_INC(tcp_ccgen); 801 if (taop->tao_ccsent != 0 && 802 CC_GEQ(tp->cc_send, taop->tao_ccsent)) { 803 taop->tao_ccsent = tp->cc_send; 804 } else { 805 taop->tao_ccsent = 0; 806 tp->t_flags |= TF_SENDCCNEW; 807 } 808 809 return (0); 810 } 811 812 #ifdef SMP 813 814 struct netmsg_tcp_connect { 815 struct lwkt_msg nm_lmsg; 816 struct tcpcb *nm_tp; 817 struct sockaddr_in *nm_sin; 818 struct sockaddr_in *nm_ifsin; 819 }; 820 821 static int 822 tcp_connect_handler(lwkt_msg_t lmsg) 823 { 824 struct netmsg_tcp_connect *msg = (void *)lmsg; 825 int error; 826 827 error = tcp_connect_oncpu(msg->nm_tp, msg->nm_sin, msg->nm_ifsin); 828 lwkt_replymsg(lmsg, error); 829 return(EASYNC); 830 } 831 832 #endif 833 834 /* 835 * Common subroutine to open a TCP connection to remote host specified 836 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 837 * port number if needed. Call in_pcbladdr to do the routing and to choose 838 * a local host address (interface). If there is an existing incarnation 839 * of the same connection in TIME-WAIT state and if the remote host was 840 * sending CC options and if the connection duration was < MSL, then 841 * truncate the previous TIME-WAIT state and proceed. 842 * Initialize connection parameters and enter SYN-SENT state. 843 */ 844 static int 845 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 846 { 847 struct inpcb *inp = tp->t_inpcb; 848 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 849 struct sockaddr_in *if_sin; 850 int error; 851 #ifdef SMP 852 lwkt_port_t port; 853 #endif 854 855 if (inp->inp_lport == 0) { 856 error = in_pcbbind(inp, (struct sockaddr *)NULL, td); 857 if (error) 858 return (error); 859 } 860 861 /* 862 * Cannot simply call in_pcbconnect, because there might be an 863 * earlier incarnation of this same connection still in 864 * TIME_WAIT state, creating an ADDRINUSE error. 865 */ 866 error = in_pcbladdr(inp, nam, &if_sin); 867 if (error) 868 return (error); 869 870 #ifdef SMP 871 port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port, 872 inp->inp_laddr.s_addr ? 873 inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr, 874 inp->inp_lport); 875 876 if (port->mp_td != curthread) { 877 struct netmsg_tcp_connect msg; 878 879 lwkt_initmsg(&msg.nm_lmsg, &curthread->td_msgport, 0, 880 lwkt_cmd_func(tcp_connect_handler), lwkt_cmd_op_none); 881 msg.nm_tp = tp; 882 msg.nm_sin = sin; 883 msg.nm_ifsin = if_sin; 884 error = lwkt_domsg(port, &msg.nm_lmsg); 885 } else 886 #endif 887 error = tcp_connect_oncpu(tp, sin, if_sin); 888 889 return (error); 890 } 891 892 #ifdef INET6 893 static int 894 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 895 { 896 struct inpcb *inp = tp->t_inpcb, *oinp; 897 struct socket *so = inp->inp_socket; 898 struct tcpcb *otp; 899 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 900 struct in6_addr *addr6; 901 struct rmxp_tao *taop; 902 struct rmxp_tao tao_noncached; 903 int error; 904 905 if (inp->inp_lport == 0) { 906 error = in6_pcbbind(inp, (struct sockaddr *)0, td); 907 if (error) 908 return error; 909 } 910 911 /* 912 * Cannot simply call in_pcbconnect, because there might be an 913 * earlier incarnation of this same connection still in 914 * TIME_WAIT state, creating an ADDRINUSE error. 915 */ 916 error = in6_pcbladdr(inp, nam, &addr6); 917 if (error) 918 return error; 919 oinp = in6_pcblookup_hash(inp->inp_cpcbinfo, 920 &sin6->sin6_addr, sin6->sin6_port, 921 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ? 922 addr6 : &inp->in6p_laddr, 923 inp->inp_lport, 0, NULL); 924 if (oinp) { 925 if (oinp != inp && (otp = intotcpcb(oinp)) != NULL && 926 otp->t_state == TCPS_TIME_WAIT && 927 (ticks - otp->t_starttime) < tcp_msl && 928 (otp->t_flags & TF_RCVD_CC)) 929 otp = tcp_close(otp); 930 else 931 return (EADDRINUSE); 932 } 933 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 934 inp->in6p_laddr = *addr6; 935 inp->in6p_faddr = sin6->sin6_addr; 936 inp->inp_fport = sin6->sin6_port; 937 if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != NULL) 938 inp->in6p_flowinfo = sin6->sin6_flowinfo; 939 in_pcbinsconnhash(inp); 940 941 /* Compute window scaling to request. */ 942 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 943 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat) 944 tp->request_r_scale++; 945 946 soisconnecting(so); 947 tcpstat.tcps_connattempt++; 948 tp->t_state = TCPS_SYN_SENT; 949 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp); 950 tp->iss = tcp_new_isn(tp); 951 tp->t_bw_rtseq = tp->iss; 952 tcp_sendseqinit(tp); 953 954 /* 955 * Generate a CC value for this connection and 956 * check whether CC or CCnew should be used. 957 */ 958 if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) { 959 taop = &tao_noncached; 960 bzero(taop, sizeof(*taop)); 961 } 962 963 tp->cc_send = CC_INC(tcp_ccgen); 964 if (taop->tao_ccsent != 0 && 965 CC_GEQ(tp->cc_send, taop->tao_ccsent)) { 966 taop->tao_ccsent = tp->cc_send; 967 } else { 968 taop->tao_ccsent = 0; 969 tp->t_flags |= TF_SENDCCNEW; 970 } 971 972 return (0); 973 } 974 #endif /* INET6 */ 975 976 /* 977 * The new sockopt interface makes it possible for us to block in the 978 * copyin/out step (if we take a page fault). Taking a page fault at 979 * splnet() is probably a Bad Thing. (Since sockets and pcbs both now 980 * use TSM, there probably isn't any need for this function to run at 981 * splnet() any more. This needs more examination.) 982 */ 983 int 984 tcp_ctloutput(so, sopt) 985 struct socket *so; 986 struct sockopt *sopt; 987 { 988 int error, opt, optval, s; 989 struct inpcb *inp; 990 struct tcpcb *tp; 991 992 error = 0; 993 s = splnet(); /* XXX */ 994 inp = sotoinpcb(so); 995 if (inp == NULL) { 996 splx(s); 997 return (ECONNRESET); 998 } 999 if (sopt->sopt_level != IPPROTO_TCP) { 1000 #ifdef INET6 1001 if (INP_CHECK_SOCKAF(so, AF_INET6)) 1002 error = ip6_ctloutput(so, sopt); 1003 else 1004 #endif /* INET6 */ 1005 error = ip_ctloutput(so, sopt); 1006 splx(s); 1007 return (error); 1008 } 1009 tp = intotcpcb(inp); 1010 1011 switch (sopt->sopt_dir) { 1012 case SOPT_SET: 1013 switch (sopt->sopt_name) { 1014 case TCP_NODELAY: 1015 case TCP_NOOPT: 1016 error = sooptcopyin(sopt, &optval, sizeof optval, 1017 sizeof optval); 1018 if (error) 1019 break; 1020 1021 switch (sopt->sopt_name) { 1022 case TCP_NODELAY: 1023 opt = TF_NODELAY; 1024 break; 1025 case TCP_NOOPT: 1026 opt = TF_NOOPT; 1027 break; 1028 default: 1029 opt = 0; /* dead code to fool gcc */ 1030 break; 1031 } 1032 1033 if (optval) 1034 tp->t_flags |= opt; 1035 else 1036 tp->t_flags &= ~opt; 1037 break; 1038 1039 case TCP_NOPUSH: 1040 error = sooptcopyin(sopt, &optval, sizeof optval, 1041 sizeof optval); 1042 if (error) 1043 break; 1044 1045 if (optval) 1046 tp->t_flags |= TF_NOPUSH; 1047 else { 1048 tp->t_flags &= ~TF_NOPUSH; 1049 error = tcp_output(tp); 1050 } 1051 break; 1052 1053 case TCP_MAXSEG: 1054 error = sooptcopyin(sopt, &optval, sizeof optval, 1055 sizeof optval); 1056 if (error) 1057 break; 1058 1059 if (optval > 0 && optval <= tp->t_maxseg) 1060 tp->t_maxseg = optval; 1061 else 1062 error = EINVAL; 1063 break; 1064 1065 default: 1066 error = ENOPROTOOPT; 1067 break; 1068 } 1069 break; 1070 1071 case SOPT_GET: 1072 switch (sopt->sopt_name) { 1073 case TCP_NODELAY: 1074 optval = tp->t_flags & TF_NODELAY; 1075 break; 1076 case TCP_MAXSEG: 1077 optval = tp->t_maxseg; 1078 break; 1079 case TCP_NOOPT: 1080 optval = tp->t_flags & TF_NOOPT; 1081 break; 1082 case TCP_NOPUSH: 1083 optval = tp->t_flags & TF_NOPUSH; 1084 break; 1085 default: 1086 error = ENOPROTOOPT; 1087 break; 1088 } 1089 if (error == 0) 1090 error = sooptcopyout(sopt, &optval, sizeof optval); 1091 break; 1092 } 1093 splx(s); 1094 return (error); 1095 } 1096 1097 /* 1098 * tcp_sendspace and tcp_recvspace are the default send and receive window 1099 * sizes, respectively. These are obsolescent (this information should 1100 * be set by the route). 1101 */ 1102 u_long tcp_sendspace = 1024*32; 1103 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, 1104 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); 1105 u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ 1106 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 1107 &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); 1108 1109 /* 1110 * Attach TCP protocol to socket, allocating 1111 * internet protocol control block, tcp control block, 1112 * bufer space, and entering LISTEN state if to accept connections. 1113 */ 1114 static int 1115 tcp_attach(struct socket *so, struct pru_attach_info *ai) 1116 { 1117 struct tcpcb *tp; 1118 struct inpcb *inp; 1119 int error; 1120 int cpu; 1121 #ifdef INET6 1122 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != NULL; 1123 #endif 1124 1125 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1126 error = soreserve(so, tcp_sendspace, tcp_recvspace, 1127 ai->sb_rlimit); 1128 if (error) 1129 return (error); 1130 } 1131 cpu = mycpu->gd_cpuid; 1132 error = in_pcballoc(so, &tcbinfo[cpu]); 1133 if (error) 1134 return (error); 1135 inp = sotoinpcb(so); 1136 #ifdef INET6 1137 if (isipv6) { 1138 inp->inp_vflag |= INP_IPV6; 1139 inp->in6p_hops = -1; /* use kernel default */ 1140 } 1141 else 1142 #endif 1143 inp->inp_vflag |= INP_IPV4; 1144 tp = tcp_newtcpcb(inp); 1145 if (tp == 0) { 1146 int nofd = so->so_state & SS_NOFDREF; /* XXX */ 1147 1148 so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */ 1149 #ifdef INET6 1150 if (isipv6) 1151 in6_pcbdetach(inp); 1152 else 1153 #endif 1154 in_pcbdetach(inp); 1155 so->so_state |= nofd; 1156 return (ENOBUFS); 1157 } 1158 tp->t_state = TCPS_CLOSED; 1159 return (0); 1160 } 1161 1162 /* 1163 * Initiate (or continue) disconnect. 1164 * If embryonic state, just send reset (once). 1165 * If in ``let data drain'' option and linger null, just drop. 1166 * Otherwise (hard), mark socket disconnecting and drop 1167 * current input data; switch states based on user close, and 1168 * send segment to peer (with FIN). 1169 */ 1170 static struct tcpcb * 1171 tcp_disconnect(tp) 1172 struct tcpcb *tp; 1173 { 1174 struct socket *so = tp->t_inpcb->inp_socket; 1175 1176 if (tp->t_state < TCPS_ESTABLISHED) 1177 tp = tcp_close(tp); 1178 else if ((so->so_options & SO_LINGER) && so->so_linger == 0) 1179 tp = tcp_drop(tp, 0); 1180 else { 1181 soisdisconnecting(so); 1182 sbflush(&so->so_rcv); 1183 tp = tcp_usrclosed(tp); 1184 if (tp) 1185 (void) tcp_output(tp); 1186 } 1187 return (tp); 1188 } 1189 1190 /* 1191 * User issued close, and wish to trail through shutdown states: 1192 * if never received SYN, just forget it. If got a SYN from peer, 1193 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1194 * If already got a FIN from peer, then almost done; go to LAST_ACK 1195 * state. In all other cases, have already sent FIN to peer (e.g. 1196 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1197 * for peer to send FIN or not respond to keep-alives, etc. 1198 * We can let the user exit from the close as soon as the FIN is acked. 1199 */ 1200 static struct tcpcb * 1201 tcp_usrclosed(tp) 1202 struct tcpcb *tp; 1203 { 1204 1205 switch (tp->t_state) { 1206 1207 case TCPS_CLOSED: 1208 case TCPS_LISTEN: 1209 tp->t_state = TCPS_CLOSED; 1210 tp = tcp_close(tp); 1211 break; 1212 1213 case TCPS_SYN_SENT: 1214 case TCPS_SYN_RECEIVED: 1215 tp->t_flags |= TF_NEEDFIN; 1216 break; 1217 1218 case TCPS_ESTABLISHED: 1219 tp->t_state = TCPS_FIN_WAIT_1; 1220 break; 1221 1222 case TCPS_CLOSE_WAIT: 1223 tp->t_state = TCPS_LAST_ACK; 1224 break; 1225 } 1226 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) { 1227 soisdisconnected(tp->t_inpcb->inp_socket); 1228 /* To prevent the connection hanging in FIN_WAIT_2 forever. */ 1229 if (tp->t_state == TCPS_FIN_WAIT_2) 1230 callout_reset(tp->tt_2msl, tcp_maxidle, 1231 tcp_timer_2msl, tp); 1232 } 1233 return (tp); 1234 } 1235