Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_usrreq.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94 30 * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.107.2.6 2005/06/14 12:01:03 rwatson Exp $ 31 */ 32 33 #include "opt_ipsec.h" 34 #include "opt_inet.h" 35 #include "opt_inet6.h" 36 #include "opt_tcpdebug.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/malloc.h> 41 #include <sys/kernel.h> 42 #include <sys/sysctl.h> 43 #include <sys/mbuf.h> 44 #ifdef INET6 45 #include <sys/domain.h> 46 #endif /* INET6 */ 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/protosw.h> 50 #include <sys/proc.h> 51 #include <sys/jail.h> 52 53 #include <net/if.h> 54 #include <net/route.h> 55 56 #include <netinet/in.h> 57 #include <netinet/in_systm.h> 58 #ifdef INET6 59 #include <netinet/ip6.h> 60 #endif 61 #include <netinet/in_pcb.h> 62 #ifdef INET6 63 #include <netinet6/in6_pcb.h> 64 #endif 65 #include <netinet/in_var.h> 66 #include <netinet/ip_var.h> 67 #ifdef INET6 68 #include <netinet6/ip6_var.h> 69 #endif 70 #include <netinet/tcp.h> 71 #include <netinet/tcp_fsm.h> 72 #include <netinet/tcp_seq.h> 73 #include <netinet/tcp_timer.h> 74 #include <netinet/tcp_var.h> 75 #include <netinet/tcpip.h> 76 #ifdef TCPDEBUG 77 #include <netinet/tcp_debug.h> 78 #endif 79 80 #ifdef IPSEC 81 #include <netinet6/ipsec.h> 82 #endif /*IPSEC*/ 83 84 /* 85 * TCP protocol interface to socket abstraction. 86 */ 87 extern char *tcpstates[]; /* XXX ??? */ 88 89 static int tcp_attach(struct socket *); 90 static int tcp_connect(struct tcpcb *, struct sockaddr *, 91 struct thread *td); 92 #ifdef INET6 93 static int tcp6_connect(struct tcpcb *, struct sockaddr *, 94 struct thread *td); 95 #endif /* INET6 */ 96 static struct tcpcb * 97 tcp_disconnect(struct tcpcb *); 98 static struct tcpcb * 99 tcp_usrclosed(struct tcpcb *); 100 101 #ifdef TCPDEBUG 102 #define TCPDEBUG0 int ostate = 0 103 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 104 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 105 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 106 #else 107 #define TCPDEBUG0 108 #define TCPDEBUG1() 109 #define TCPDEBUG2(req) 110 #endif 111 112 /* 113 * TCP attaches to socket via pru_attach(), reserving space, 114 * and an internet control block. 115 */ 116 static int 117 tcp_usr_attach(struct socket *so, int proto, struct thread *td) 118 { 119 int error; 120 struct inpcb *inp; 121 struct tcpcb *tp = 0; 122 TCPDEBUG0; 123 124 INP_INFO_WLOCK(&tcbinfo); 125 TCPDEBUG1(); 126 inp = sotoinpcb(so); 127 if (inp) { 128 error = EISCONN; 129 goto out; 130 } 131 132 error = tcp_attach(so); 133 if (error) 134 goto out; 135 136 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 137 so->so_linger = TCP_LINGERTIME; 138 139 inp = sotoinpcb(so); 140 tp = intotcpcb(inp); 141 out: 142 TCPDEBUG2(PRU_ATTACH); 143 INP_INFO_WUNLOCK(&tcbinfo); 144 return error; 145 } 146 147 /* 148 * pru_detach() detaches the TCP protocol from the socket. 149 * If the protocol state is non-embryonic, then can't 150 * do this directly: have to initiate a pru_disconnect(), 151 * which may finish later; embryonic TCB's can just 152 * be discarded here. 153 */ 154 static int 155 tcp_usr_detach(struct socket *so) 156 { 157 int error = 0; 158 struct inpcb *inp; 159 struct tcpcb *tp; 160 TCPDEBUG0; 161 162 INP_INFO_WLOCK(&tcbinfo); 163 inp = sotoinpcb(so); 164 if (inp == NULL) { 165 INP_INFO_WUNLOCK(&tcbinfo); 166 return error; 167 } 168 INP_LOCK(inp); 169 tp = intotcpcb(inp); 170 TCPDEBUG1(); 171 tp = tcp_disconnect(tp); 172 173 TCPDEBUG2(PRU_DETACH); 174 if (tp) 175 INP_UNLOCK(inp); 176 INP_INFO_WUNLOCK(&tcbinfo); 177 return error; 178 } 179 180 #define INI_NOLOCK 0 181 #define INI_READ 1 182 #define INI_WRITE 2 183 184 #define COMMON_START() \ 185 TCPDEBUG0; \ 186 do { \ 187 if (inirw == INI_READ) \ 188 INP_INFO_RLOCK(&tcbinfo); \ 189 else if (inirw == INI_WRITE) \ 190 INP_INFO_WLOCK(&tcbinfo); \ 191 inp = sotoinpcb(so); \ 192 if (inp == 0) { \ 193 if (inirw == INI_READ) \ 194 INP_INFO_RUNLOCK(&tcbinfo); \ 195 else if (inirw == INI_WRITE) \ 196 INP_INFO_WUNLOCK(&tcbinfo); \ 197 return EINVAL; \ 198 } \ 199 INP_LOCK(inp); \ 200 if (inirw == INI_READ) \ 201 INP_INFO_RUNLOCK(&tcbinfo); \ 202 tp = intotcpcb(inp); \ 203 TCPDEBUG1(); \ 204 } while(0) 205 206 #define COMMON_END(req) \ 207 out: TCPDEBUG2(req); \ 208 do { \ 209 if (tp) \ 210 INP_UNLOCK(inp); \ 211 if (inirw == INI_WRITE) \ 212 INP_INFO_WUNLOCK(&tcbinfo); \ 213 return error; \ 214 goto out; \ 215 } while(0) 216 217 /* 218 * Give the socket an address. 219 */ 220 static int 221 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 222 { 223 int error = 0; 224 struct inpcb *inp; 225 struct tcpcb *tp; 226 struct sockaddr_in *sinp; 227 const int inirw = INI_WRITE; 228 229 sinp = (struct sockaddr_in *)nam; 230 if (nam->sa_len != sizeof (*sinp)) 231 return (EINVAL); 232 /* 233 * Must check for multicast addresses and disallow binding 234 * to them. 235 */ 236 if (sinp->sin_family == AF_INET && 237 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 238 return (EAFNOSUPPORT); 239 240 COMMON_START(); 241 error = in_pcbbind(inp, nam, td->td_ucred); 242 if (error) 243 goto out; 244 COMMON_END(PRU_BIND); 245 } 246 247 #ifdef INET6 248 static int 249 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 250 { 251 int error = 0; 252 struct inpcb *inp; 253 struct tcpcb *tp; 254 struct sockaddr_in6 *sin6p; 255 const int inirw = INI_WRITE; 256 257 sin6p = (struct sockaddr_in6 *)nam; 258 if (nam->sa_len != sizeof (*sin6p)) 259 return (EINVAL); 260 /* 261 * Must check for multicast addresses and disallow binding 262 * to them. 263 */ 264 if (sin6p->sin6_family == AF_INET6 && 265 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 266 return (EAFNOSUPPORT); 267 268 COMMON_START(); 269 inp->inp_vflag &= ~INP_IPV4; 270 inp->inp_vflag |= INP_IPV6; 271 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 272 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 273 inp->inp_vflag |= INP_IPV4; 274 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 275 struct sockaddr_in sin; 276 277 in6_sin6_2_sin(&sin, sin6p); 278 inp->inp_vflag |= INP_IPV4; 279 inp->inp_vflag &= ~INP_IPV6; 280 error = in_pcbbind(inp, (struct sockaddr *)&sin, 281 td->td_ucred); 282 goto out; 283 } 284 } 285 error = in6_pcbbind(inp, nam, td->td_ucred); 286 if (error) 287 goto out; 288 COMMON_END(PRU_BIND); 289 } 290 #endif /* INET6 */ 291 292 /* 293 * Prepare to accept connections. 294 */ 295 static int 296 tcp_usr_listen(struct socket *so, struct thread *td) 297 { 298 int error = 0; 299 struct inpcb *inp; 300 struct tcpcb *tp; 301 const int inirw = INI_WRITE; 302 303 COMMON_START(); 304 SOCK_LOCK(so); 305 error = solisten_proto_check(so); 306 if (error == 0 && inp->inp_lport == 0) 307 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 308 if (error == 0) { 309 tp->t_state = TCPS_LISTEN; 310 solisten_proto(so); 311 } 312 SOCK_UNLOCK(so); 313 COMMON_END(PRU_LISTEN); 314 } 315 316 #ifdef INET6 317 static int 318 tcp6_usr_listen(struct socket *so, struct thread *td) 319 { 320 int error = 0; 321 struct inpcb *inp; 322 struct tcpcb *tp; 323 const int inirw = INI_WRITE; 324 325 COMMON_START(); 326 SOCK_LOCK(so); 327 error = solisten_proto_check(so); 328 if (error == 0 && inp->inp_lport == 0) { 329 inp->inp_vflag &= ~INP_IPV4; 330 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 331 inp->inp_vflag |= INP_IPV4; 332 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 333 } 334 if (error == 0) { 335 tp->t_state = TCPS_LISTEN; 336 solisten_proto(so); 337 } 338 SOCK_UNLOCK(so); 339 COMMON_END(PRU_LISTEN); 340 } 341 #endif /* INET6 */ 342 343 /* 344 * Initiate connection to peer. 345 * Create a template for use in transmissions on this connection. 346 * Enter SYN_SENT state, and mark socket as connecting. 347 * Start keep-alive timer, and seed output sequence space. 348 * Send initial segment on connection. 349 */ 350 static int 351 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 352 { 353 int error = 0; 354 struct inpcb *inp; 355 struct tcpcb *tp; 356 struct sockaddr_in *sinp; 357 const int inirw = INI_WRITE; 358 359 sinp = (struct sockaddr_in *)nam; 360 if (nam->sa_len != sizeof (*sinp)) 361 return (EINVAL); 362 /* 363 * Must disallow TCP ``connections'' to multicast addresses. 364 */ 365 if (sinp->sin_family == AF_INET 366 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 367 return (EAFNOSUPPORT); 368 if (td && jailed(td->td_ucred)) 369 prison_remote_ip(td->td_ucred, 0, &sinp->sin_addr.s_addr); 370 371 COMMON_START(); 372 if ((error = tcp_connect(tp, nam, td)) != 0) 373 goto out; 374 error = tcp_output(tp); 375 COMMON_END(PRU_CONNECT); 376 } 377 378 #ifdef INET6 379 static int 380 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 381 { 382 int error = 0; 383 struct inpcb *inp; 384 struct tcpcb *tp; 385 struct sockaddr_in6 *sin6p; 386 const int inirw = INI_WRITE; 387 388 sin6p = (struct sockaddr_in6 *)nam; 389 if (nam->sa_len != sizeof (*sin6p)) 390 return (EINVAL); 391 /* 392 * Must disallow TCP ``connections'' to multicast addresses. 393 */ 394 if (sin6p->sin6_family == AF_INET6 395 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 396 return (EAFNOSUPPORT); 397 398 COMMON_START(); 399 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 400 struct sockaddr_in sin; 401 402 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 403 error = EINVAL; 404 goto out; 405 } 406 407 in6_sin6_2_sin(&sin, sin6p); 408 inp->inp_vflag |= INP_IPV4; 409 inp->inp_vflag &= ~INP_IPV6; 410 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 411 goto out; 412 error = tcp_output(tp); 413 goto out; 414 } 415 inp->inp_vflag &= ~INP_IPV4; 416 inp->inp_vflag |= INP_IPV6; 417 inp->inp_inc.inc_isipv6 = 1; 418 if ((error = tcp6_connect(tp, nam, td)) != 0) 419 goto out; 420 error = tcp_output(tp); 421 COMMON_END(PRU_CONNECT); 422 } 423 #endif /* INET6 */ 424 425 /* 426 * Initiate disconnect from peer. 427 * If connection never passed embryonic stage, just drop; 428 * else if don't need to let data drain, then can just drop anyways, 429 * else have to begin TCP shutdown process: mark socket disconnecting, 430 * drain unread data, state switch to reflect user close, and 431 * send segment (e.g. FIN) to peer. Socket will be really disconnected 432 * when peer sends FIN and acks ours. 433 * 434 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 435 */ 436 static int 437 tcp_usr_disconnect(struct socket *so) 438 { 439 int error = 0; 440 struct inpcb *inp; 441 struct tcpcb *tp; 442 const int inirw = INI_WRITE; 443 444 COMMON_START(); 445 tp = tcp_disconnect(tp); 446 COMMON_END(PRU_DISCONNECT); 447 } 448 449 /* 450 * Accept a connection. Essentially all the work is 451 * done at higher levels; just return the address 452 * of the peer, storing through addr. 453 */ 454 static int 455 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 456 { 457 int error = 0; 458 struct inpcb *inp = NULL; 459 struct tcpcb *tp = NULL; 460 struct in_addr addr; 461 in_port_t port = 0; 462 TCPDEBUG0; 463 464 if (so->so_state & SS_ISDISCONNECTED) { 465 error = ECONNABORTED; 466 goto out; 467 } 468 469 INP_INFO_RLOCK(&tcbinfo); 470 inp = sotoinpcb(so); 471 if (!inp) { 472 INP_INFO_RUNLOCK(&tcbinfo); 473 return (EINVAL); 474 } 475 INP_LOCK(inp); 476 INP_INFO_RUNLOCK(&tcbinfo); 477 tp = intotcpcb(inp); 478 TCPDEBUG1(); 479 480 /* 481 * We inline in_setpeeraddr and COMMON_END here, so that we can 482 * copy the data of interest and defer the malloc until after we 483 * release the lock. 484 */ 485 port = inp->inp_fport; 486 addr = inp->inp_faddr; 487 488 out: TCPDEBUG2(PRU_ACCEPT); 489 if (tp) 490 INP_UNLOCK(inp); 491 if (error == 0) 492 *nam = in_sockaddr(port, &addr); 493 return error; 494 } 495 496 #ifdef INET6 497 static int 498 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 499 { 500 struct inpcb *inp = NULL; 501 int error = 0; 502 struct tcpcb *tp = NULL; 503 struct in_addr addr; 504 struct in6_addr addr6; 505 in_port_t port = 0; 506 int v4 = 0; 507 TCPDEBUG0; 508 509 if (so->so_state & SS_ISDISCONNECTED) { 510 error = ECONNABORTED; 511 goto out; 512 } 513 514 INP_INFO_RLOCK(&tcbinfo); 515 inp = sotoinpcb(so); 516 if (inp == 0) { 517 INP_INFO_RUNLOCK(&tcbinfo); 518 return (EINVAL); 519 } 520 INP_LOCK(inp); 521 INP_INFO_RUNLOCK(&tcbinfo); 522 tp = intotcpcb(inp); 523 TCPDEBUG1(); 524 /* 525 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 526 * copy the data of interest and defer the malloc until after we 527 * release the lock. 528 */ 529 if (inp->inp_vflag & INP_IPV4) { 530 v4 = 1; 531 port = inp->inp_fport; 532 addr = inp->inp_faddr; 533 } else { 534 port = inp->inp_fport; 535 addr6 = inp->in6p_faddr; 536 } 537 538 out: TCPDEBUG2(PRU_ACCEPT); 539 if (tp) 540 INP_UNLOCK(inp); 541 if (error == 0) { 542 if (v4) 543 *nam = in6_v4mapsin6_sockaddr(port, &addr); 544 else 545 *nam = in6_sockaddr(port, &addr6); 546 } 547 return error; 548 } 549 #endif /* INET6 */ 550 551 /* 552 * This is the wrapper function for in_setsockaddr. We just pass down 553 * the pcbinfo for in_setsockaddr to lock. We don't want to do the locking 554 * here because in_setsockaddr will call malloc and can block. 555 */ 556 static int 557 tcp_sockaddr(struct socket *so, struct sockaddr **nam) 558 { 559 return (in_setsockaddr(so, nam, &tcbinfo)); 560 } 561 562 /* 563 * This is the wrapper function for in_setpeeraddr. We just pass down 564 * the pcbinfo for in_setpeeraddr to lock. 565 */ 566 static int 567 tcp_peeraddr(struct socket *so, struct sockaddr **nam) 568 { 569 return (in_setpeeraddr(so, nam, &tcbinfo)); 570 } 571 572 /* 573 * Mark the connection as being incapable of further output. 574 */ 575 static int 576 tcp_usr_shutdown(struct socket *so) 577 { 578 int error = 0; 579 struct inpcb *inp; 580 struct tcpcb *tp; 581 const int inirw = INI_WRITE; 582 583 COMMON_START(); 584 socantsendmore(so); 585 tp = tcp_usrclosed(tp); 586 if (tp) 587 error = tcp_output(tp); 588 COMMON_END(PRU_SHUTDOWN); 589 } 590 591 /* 592 * After a receive, possibly send window update to peer. 593 */ 594 static int 595 tcp_usr_rcvd(struct socket *so, int flags) 596 { 597 int error = 0; 598 struct inpcb *inp; 599 struct tcpcb *tp; 600 const int inirw = INI_READ; 601 602 COMMON_START(); 603 tcp_output(tp); 604 COMMON_END(PRU_RCVD); 605 } 606 607 /* 608 * Do a send by putting data in output queue and updating urgent 609 * marker if URG set. Possibly send more data. Unlike the other 610 * pru_*() routines, the mbuf chains are our responsibility. We 611 * must either enqueue them or free them. The other pru_* routines 612 * generally are caller-frees. 613 */ 614 static int 615 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 616 struct sockaddr *nam, struct mbuf *control, struct thread *td) 617 { 618 int error = 0; 619 struct inpcb *inp; 620 struct tcpcb *tp; 621 const int inirw = INI_WRITE; 622 #ifdef INET6 623 int isipv6; 624 #endif 625 TCPDEBUG0; 626 627 /* 628 * Need write lock here because this function might call 629 * tcp_connect or tcp_usrclosed. 630 * We really want to have to this function upgrade from read lock 631 * to write lock. XXX 632 */ 633 INP_INFO_WLOCK(&tcbinfo); 634 inp = sotoinpcb(so); 635 if (inp == NULL) { 636 /* 637 * OOPS! we lost a race, the TCP session got reset after 638 * we checked SBS_CANTSENDMORE, eg: while doing uiomove or a 639 * network interrupt in the non-splnet() section of sosend(). 640 */ 641 if (m) 642 m_freem(m); 643 if (control) 644 m_freem(control); 645 error = ECONNRESET; /* XXX EPIPE? */ 646 tp = NULL; 647 TCPDEBUG1(); 648 goto out; 649 } 650 INP_LOCK(inp); 651 #ifdef INET6 652 isipv6 = nam && nam->sa_family == AF_INET6; 653 #endif /* INET6 */ 654 tp = intotcpcb(inp); 655 TCPDEBUG1(); 656 if (control) { 657 /* TCP doesn't do control messages (rights, creds, etc) */ 658 if (control->m_len) { 659 m_freem(control); 660 if (m) 661 m_freem(m); 662 error = EINVAL; 663 goto out; 664 } 665 m_freem(control); /* empty control, just free it */ 666 } 667 if (!(flags & PRUS_OOB)) { 668 sbappendstream(&so->so_snd, m); 669 if (nam && tp->t_state < TCPS_SYN_SENT) { 670 /* 671 * Do implied connect if not yet connected, 672 * initialize window to default value, and 673 * initialize maxseg/maxopd using peer's cached 674 * MSS. 675 */ 676 #ifdef INET6 677 if (isipv6) 678 error = tcp6_connect(tp, nam, td); 679 else 680 #endif /* INET6 */ 681 error = tcp_connect(tp, nam, td); 682 if (error) 683 goto out; 684 tp->snd_wnd = TTCP_CLIENT_SND_WND; 685 tcp_mss(tp, -1); 686 } 687 688 if (flags & PRUS_EOF) { 689 /* 690 * Close the send side of the connection after 691 * the data is sent. 692 */ 693 socantsendmore(so); 694 tp = tcp_usrclosed(tp); 695 } 696 if (tp != NULL) { 697 if (flags & PRUS_MORETOCOME) 698 tp->t_flags |= TF_MORETOCOME; 699 error = tcp_output(tp); 700 if (flags & PRUS_MORETOCOME) 701 tp->t_flags &= ~TF_MORETOCOME; 702 } 703 } else { 704 SOCKBUF_LOCK(&so->so_snd); 705 if (sbspace(&so->so_snd) < -512) { 706 SOCKBUF_UNLOCK(&so->so_snd); 707 m_freem(m); 708 error = ENOBUFS; 709 goto out; 710 } 711 /* 712 * According to RFC961 (Assigned Protocols), 713 * the urgent pointer points to the last octet 714 * of urgent data. We continue, however, 715 * to consider it to indicate the first octet 716 * of data past the urgent section. 717 * Otherwise, snd_up should be one lower. 718 */ 719 sbappendstream_locked(&so->so_snd, m); 720 SOCKBUF_UNLOCK(&so->so_snd); 721 if (nam && tp->t_state < TCPS_SYN_SENT) { 722 /* 723 * Do implied connect if not yet connected, 724 * initialize window to default value, and 725 * initialize maxseg/maxopd using peer's cached 726 * MSS. 727 */ 728 #ifdef INET6 729 if (isipv6) 730 error = tcp6_connect(tp, nam, td); 731 else 732 #endif /* INET6 */ 733 error = tcp_connect(tp, nam, td); 734 if (error) 735 goto out; 736 tp->snd_wnd = TTCP_CLIENT_SND_WND; 737 tcp_mss(tp, -1); 738 } 739 tp->snd_up = tp->snd_una + so->so_snd.sb_cc; 740 tp->t_force = 1; 741 error = tcp_output(tp); 742 tp->t_force = 0; 743 } 744 COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB : 745 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 746 } 747 748 /* 749 * Abort the TCP. 750 */ 751 static int 752 tcp_usr_abort(struct socket *so) 753 { 754 int error = 0; 755 struct inpcb *inp; 756 struct tcpcb *tp; 757 const int inirw = INI_WRITE; 758 759 COMMON_START(); 760 tp = tcp_drop(tp, ECONNABORTED); 761 COMMON_END(PRU_ABORT); 762 } 763 764 /* 765 * Receive out-of-band data. 766 */ 767 static int 768 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 769 { 770 int error = 0; 771 struct inpcb *inp; 772 struct tcpcb *tp; 773 const int inirw = INI_READ; 774 775 COMMON_START(); 776 if ((so->so_oobmark == 0 && 777 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 778 so->so_options & SO_OOBINLINE || 779 tp->t_oobflags & TCPOOB_HADDATA) { 780 error = EINVAL; 781 goto out; 782 } 783 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 784 error = EWOULDBLOCK; 785 goto out; 786 } 787 m->m_len = 1; 788 *mtod(m, caddr_t) = tp->t_iobc; 789 if ((flags & MSG_PEEK) == 0) 790 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 791 COMMON_END(PRU_RCVOOB); 792 } 793 794 /* xxx - should be const */ 795 struct pr_usrreqs tcp_usrreqs = { 796 tcp_usr_abort, tcp_usr_accept, tcp_usr_attach, tcp_usr_bind, 797 tcp_usr_connect, pru_connect2_notsupp, in_control, tcp_usr_detach, 798 tcp_usr_disconnect, tcp_usr_listen, tcp_peeraddr, tcp_usr_rcvd, 799 tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown, 800 tcp_sockaddr, sosend, soreceive, sopoll, in_pcbsosetlabel 801 }; 802 803 #ifdef INET6 804 struct pr_usrreqs tcp6_usrreqs = { 805 tcp_usr_abort, tcp6_usr_accept, tcp_usr_attach, tcp6_usr_bind, 806 tcp6_usr_connect, pru_connect2_notsupp, in6_control, tcp_usr_detach, 807 tcp_usr_disconnect, tcp6_usr_listen, in6_mapped_peeraddr, tcp_usr_rcvd, 808 tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown, 809 in6_mapped_sockaddr, sosend, soreceive, sopoll, in_pcbsosetlabel 810 }; 811 #endif /* INET6 */ 812 813 /* 814 * Common subroutine to open a TCP connection to remote host specified 815 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 816 * port number if needed. Call in_pcbconnect_setup to do the routing and 817 * to choose a local host address (interface). If there is an existing 818 * incarnation of the same connection in TIME-WAIT state and if the remote 819 * host was sending CC options and if the connection duration was < MSL, then 820 * truncate the previous TIME-WAIT state and proceed. 821 * Initialize connection parameters and enter SYN-SENT state. 822 */ 823 static int 824 tcp_connect(tp, nam, td) 825 register struct tcpcb *tp; 826 struct sockaddr *nam; 827 struct thread *td; 828 { 829 struct inpcb *inp = tp->t_inpcb, *oinp; 830 struct socket *so = inp->inp_socket; 831 struct tcptw *otw; 832 struct rmxp_tao tao; 833 struct in_addr laddr; 834 u_short lport; 835 int error; 836 837 bzero(&tao, sizeof(tao)); 838 839 if (inp->inp_lport == 0) { 840 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 841 if (error) 842 return error; 843 } 844 845 /* 846 * Cannot simply call in_pcbconnect, because there might be an 847 * earlier incarnation of this same connection still in 848 * TIME_WAIT state, creating an ADDRINUSE error. 849 */ 850 laddr = inp->inp_laddr; 851 lport = inp->inp_lport; 852 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 853 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 854 if (error && oinp == NULL) 855 return error; 856 if (oinp) { 857 if (oinp != inp && 858 (oinp->inp_vflag & INP_TIMEWAIT) && 859 (ticks - (otw = intotw(oinp))->t_starttime) < tcp_msl && 860 otw->cc_recv != 0) { 861 inp->inp_faddr = oinp->inp_faddr; 862 inp->inp_fport = oinp->inp_fport; 863 (void) tcp_twclose(otw, 0); 864 } else 865 return EADDRINUSE; 866 } 867 inp->inp_laddr = laddr; 868 in_pcbrehash(inp); 869 870 /* Compute window scaling to request. */ 871 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 872 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat) 873 tp->request_r_scale++; 874 875 soisconnecting(so); 876 tcpstat.tcps_connattempt++; 877 tp->t_state = TCPS_SYN_SENT; 878 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp); 879 tp->iss = tcp_new_isn(tp); 880 tp->t_bw_rtseq = tp->iss; 881 tcp_sendseqinit(tp); 882 883 /* 884 * Generate a CC value for this connection and 885 * check whether CC or CCnew should be used. 886 */ 887 if (tcp_do_rfc1644) 888 tcp_hc_gettao(&inp->inp_inc, &tao); 889 890 tp->cc_send = CC_INC(tcp_ccgen); 891 if (tao.tao_ccsent != 0 && 892 CC_GEQ(tp->cc_send, tao.tao_ccsent)) { 893 tao.tao_ccsent = tp->cc_send; 894 } else { 895 tao.tao_ccsent = 0; 896 tp->t_flags |= TF_SENDCCNEW; 897 } 898 899 if (tcp_do_rfc1644) 900 tcp_hc_updatetao(&inp->inp_inc, TCP_HC_TAO_CCSENT, 901 tao.tao_ccsent, 0); 902 903 return 0; 904 } 905 906 #ifdef INET6 907 static int 908 tcp6_connect(tp, nam, td) 909 register struct tcpcb *tp; 910 struct sockaddr *nam; 911 struct thread *td; 912 { 913 struct inpcb *inp = tp->t_inpcb, *oinp; 914 struct socket *so = inp->inp_socket; 915 struct tcptw *otw; 916 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 917 struct in6_addr *addr6; 918 struct rmxp_tao tao; 919 int error; 920 921 bzero(&tao, sizeof(tao)); 922 923 if (inp->inp_lport == 0) { 924 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 925 if (error) 926 return error; 927 } 928 929 /* 930 * Cannot simply call in_pcbconnect, because there might be an 931 * earlier incarnation of this same connection still in 932 * TIME_WAIT state, creating an ADDRINUSE error. 933 */ 934 error = in6_pcbladdr(inp, nam, &addr6); 935 if (error) 936 return error; 937 oinp = in6_pcblookup_hash(inp->inp_pcbinfo, 938 &sin6->sin6_addr, sin6->sin6_port, 939 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 940 ? addr6 941 : &inp->in6p_laddr, 942 inp->inp_lport, 0, NULL); 943 if (oinp) { 944 if (oinp != inp && 945 (oinp->inp_vflag & INP_TIMEWAIT) && 946 (ticks - (otw = intotw(oinp))->t_starttime) < tcp_msl && 947 otw->cc_recv != 0) { 948 inp->inp_faddr = oinp->inp_faddr; 949 inp->inp_fport = oinp->inp_fport; 950 (void) tcp_twclose(otw, 0); 951 } else 952 return EADDRINUSE; 953 } 954 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 955 inp->in6p_laddr = *addr6; 956 inp->in6p_faddr = sin6->sin6_addr; 957 inp->inp_fport = sin6->sin6_port; 958 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 959 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 960 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 961 inp->in6p_flowinfo |= 962 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 963 in_pcbrehash(inp); 964 965 /* Compute window scaling to request. */ 966 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 967 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat) 968 tp->request_r_scale++; 969 970 soisconnecting(so); 971 tcpstat.tcps_connattempt++; 972 tp->t_state = TCPS_SYN_SENT; 973 callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp); 974 tp->iss = tcp_new_isn(tp); 975 tp->t_bw_rtseq = tp->iss; 976 tcp_sendseqinit(tp); 977 978 /* 979 * Generate a CC value for this connection and 980 * check whether CC or CCnew should be used. 981 */ 982 if (tcp_do_rfc1644) 983 tcp_hc_gettao(&inp->inp_inc, &tao); 984 985 tp->cc_send = CC_INC(tcp_ccgen); 986 if (tao.tao_ccsent != 0 && 987 CC_GEQ(tp->cc_send, tao.tao_ccsent)) { 988 tao.tao_ccsent = tp->cc_send; 989 } else { 990 tao.tao_ccsent = 0; 991 tp->t_flags |= TF_SENDCCNEW; 992 } 993 if (tcp_do_rfc1644) 994 tcp_hc_updatetao(&inp->inp_inc, TCP_HC_TAO_CCSENT, 995 tao.tao_ccsent, 0); 996 997 return 0; 998 } 999 #endif /* INET6 */ 1000 1001 /* 1002 * The new sockopt interface makes it possible for us to block in the 1003 * copyin/out step (if we take a page fault). Taking a page fault at 1004 * splnet() is probably a Bad Thing. (Since sockets and pcbs both now 1005 * use TSM, there probably isn't any need for this function to run at 1006 * splnet() any more. This needs more examination.) 1007 */ 1008 int 1009 tcp_ctloutput(so, sopt) 1010 struct socket *so; 1011 struct sockopt *sopt; 1012 { 1013 int error, opt, optval; 1014 struct inpcb *inp; 1015 struct tcpcb *tp; 1016 1017 error = 0; 1018 INP_INFO_RLOCK(&tcbinfo); 1019 inp = sotoinpcb(so); 1020 if (inp == NULL) { 1021 INP_INFO_RUNLOCK(&tcbinfo); 1022 return (ECONNRESET); 1023 } 1024 INP_LOCK(inp); 1025 INP_INFO_RUNLOCK(&tcbinfo); 1026 if (sopt->sopt_level != IPPROTO_TCP) { 1027 INP_UNLOCK(inp); 1028 #ifdef INET6 1029 if (INP_CHECK_SOCKAF(so, AF_INET6)) 1030 error = ip6_ctloutput(so, sopt); 1031 else 1032 #endif /* INET6 */ 1033 error = ip_ctloutput(so, sopt); 1034 return (error); 1035 } 1036 tp = intotcpcb(inp); 1037 1038 switch (sopt->sopt_dir) { 1039 case SOPT_SET: 1040 switch (sopt->sopt_name) { 1041 #ifdef TCP_SIGNATURE 1042 case TCP_MD5SIG: 1043 error = sooptcopyin(sopt, &optval, sizeof optval, 1044 sizeof optval); 1045 if (error) 1046 break; 1047 1048 if (optval > 0) 1049 tp->t_flags |= TF_SIGNATURE; 1050 else 1051 tp->t_flags &= ~TF_SIGNATURE; 1052 break; 1053 #endif /* TCP_SIGNATURE */ 1054 case TCP_NODELAY: 1055 case TCP_NOOPT: 1056 error = sooptcopyin(sopt, &optval, sizeof optval, 1057 sizeof optval); 1058 if (error) 1059 break; 1060 1061 switch (sopt->sopt_name) { 1062 case TCP_NODELAY: 1063 opt = TF_NODELAY; 1064 break; 1065 case TCP_NOOPT: 1066 opt = TF_NOOPT; 1067 break; 1068 default: 1069 opt = 0; /* dead code to fool gcc */ 1070 break; 1071 } 1072 1073 if (optval) 1074 tp->t_flags |= opt; 1075 else 1076 tp->t_flags &= ~opt; 1077 break; 1078 1079 case TCP_NOPUSH: 1080 error = sooptcopyin(sopt, &optval, sizeof optval, 1081 sizeof optval); 1082 if (error) 1083 break; 1084 1085 if (optval) 1086 tp->t_flags |= TF_NOPUSH; 1087 else { 1088 tp->t_flags &= ~TF_NOPUSH; 1089 error = tcp_output(tp); 1090 } 1091 break; 1092 1093 case TCP_MAXSEG: 1094 error = sooptcopyin(sopt, &optval, sizeof optval, 1095 sizeof optval); 1096 if (error) 1097 break; 1098 1099 if (optval > 0 && optval <= tp->t_maxseg && 1100 optval + 40 >= tcp_minmss) 1101 tp->t_maxseg = optval; 1102 else 1103 error = EINVAL; 1104 break; 1105 1106 default: 1107 error = ENOPROTOOPT; 1108 break; 1109 } 1110 break; 1111 1112 case SOPT_GET: 1113 switch (sopt->sopt_name) { 1114 #ifdef TCP_SIGNATURE 1115 case TCP_MD5SIG: 1116 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; 1117 break; 1118 #endif 1119 case TCP_NODELAY: 1120 optval = tp->t_flags & TF_NODELAY; 1121 break; 1122 case TCP_MAXSEG: 1123 optval = tp->t_maxseg; 1124 break; 1125 case TCP_NOOPT: 1126 optval = tp->t_flags & TF_NOOPT; 1127 break; 1128 case TCP_NOPUSH: 1129 optval = tp->t_flags & TF_NOPUSH; 1130 break; 1131 default: 1132 error = ENOPROTOOPT; 1133 break; 1134 } 1135 if (error == 0) 1136 error = sooptcopyout(sopt, &optval, sizeof optval); 1137 break; 1138 } 1139 INP_UNLOCK(inp); 1140 return (error); 1141 } 1142 1143 /* 1144 * tcp_sendspace and tcp_recvspace are the default send and receive window 1145 * sizes, respectively. These are obsolescent (this information should 1146 * be set by the route). 1147 */ 1148 u_long tcp_sendspace = 1024*32; 1149 SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, 1150 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); 1151 u_long tcp_recvspace = 1024*64; 1152 SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 1153 &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); 1154 1155 /* 1156 * Attach TCP protocol to socket, allocating 1157 * internet protocol control block, tcp control block, 1158 * bufer space, and entering LISTEN state if to accept connections. 1159 */ 1160 static int 1161 tcp_attach(so) 1162 struct socket *so; 1163 { 1164 register struct tcpcb *tp; 1165 struct inpcb *inp; 1166 int error; 1167 #ifdef INET6 1168 int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0; 1169 #endif 1170 1171 INP_INFO_WLOCK_ASSERT(&tcbinfo); 1172 1173 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1174 error = soreserve(so, tcp_sendspace, tcp_recvspace); 1175 if (error) 1176 return (error); 1177 } 1178 error = in_pcballoc(so, &tcbinfo, "tcpinp"); 1179 if (error) 1180 return (error); 1181 inp = sotoinpcb(so); 1182 #ifdef INET6 1183 if (isipv6) { 1184 inp->inp_vflag |= INP_IPV6; 1185 inp->in6p_hops = -1; /* use kernel default */ 1186 } 1187 else 1188 #endif 1189 inp->inp_vflag |= INP_IPV4; 1190 tp = tcp_newtcpcb(inp); 1191 if (tp == 0) { 1192 int nofd = so->so_state & SS_NOFDREF; /* XXX */ 1193 1194 so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */ 1195 1196 INP_LOCK(inp); 1197 #ifdef INET6 1198 if (isipv6) 1199 in6_pcbdetach(inp); 1200 else 1201 #endif 1202 in_pcbdetach(inp); 1203 so->so_state |= nofd; 1204 return (ENOBUFS); 1205 } 1206 tp->t_state = TCPS_CLOSED; 1207 return (0); 1208 } 1209 1210 /* 1211 * Initiate (or continue) disconnect. 1212 * If embryonic state, just send reset (once). 1213 * If in ``let data drain'' option and linger null, just drop. 1214 * Otherwise (hard), mark socket disconnecting and drop 1215 * current input data; switch states based on user close, and 1216 * send segment to peer (with FIN). 1217 */ 1218 static struct tcpcb * 1219 tcp_disconnect(tp) 1220 register struct tcpcb *tp; 1221 { 1222 struct inpcb *inp = tp->t_inpcb; 1223 struct socket *so = inp->inp_socket; 1224 1225 INP_INFO_WLOCK_ASSERT(&tcbinfo); 1226 INP_LOCK_ASSERT(inp); 1227 1228 if (tp->t_state < TCPS_ESTABLISHED) 1229 tp = tcp_close(tp); 1230 else if ((so->so_options & SO_LINGER) && so->so_linger == 0) 1231 tp = tcp_drop(tp, 0); 1232 else { 1233 soisdisconnecting(so); 1234 sbflush(&so->so_rcv); 1235 tp = tcp_usrclosed(tp); 1236 if (tp) 1237 (void) tcp_output(tp); 1238 } 1239 return (tp); 1240 } 1241 1242 /* 1243 * User issued close, and wish to trail through shutdown states: 1244 * if never received SYN, just forget it. If got a SYN from peer, 1245 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1246 * If already got a FIN from peer, then almost done; go to LAST_ACK 1247 * state. In all other cases, have already sent FIN to peer (e.g. 1248 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1249 * for peer to send FIN or not respond to keep-alives, etc. 1250 * We can let the user exit from the close as soon as the FIN is acked. 1251 */ 1252 static struct tcpcb * 1253 tcp_usrclosed(tp) 1254 register struct tcpcb *tp; 1255 { 1256 1257 INP_INFO_WLOCK_ASSERT(&tcbinfo); 1258 INP_LOCK_ASSERT(tp->t_inpcb); 1259 1260 switch (tp->t_state) { 1261 1262 case TCPS_CLOSED: 1263 case TCPS_LISTEN: 1264 tp->t_state = TCPS_CLOSED; 1265 tp = tcp_close(tp); 1266 break; 1267 1268 case TCPS_SYN_SENT: 1269 case TCPS_SYN_RECEIVED: 1270 tp->t_flags |= TF_NEEDFIN; 1271 break; 1272 1273 case TCPS_ESTABLISHED: 1274 tp->t_state = TCPS_FIN_WAIT_1; 1275 break; 1276 1277 case TCPS_CLOSE_WAIT: 1278 tp->t_state = TCPS_LAST_ACK; 1279 break; 1280 } 1281 if (tp && tp->t_state >= TCPS_FIN_WAIT_2) { 1282 soisdisconnected(tp->t_inpcb->inp_socket); 1283 /* To prevent the connection hanging in FIN_WAIT_2 forever. */ 1284 if (tp->t_state == TCPS_FIN_WAIT_2) 1285 callout_reset(tp->tt_2msl, tcp_maxidle, 1286 tcp_timer_2msl, tp); 1287 } 1288 return (tp); 1289 } 1290
Cache object: e7bf585d5f1c7de37177b290dc6524aa
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]