tcp_usrreq.c (14546) | tcp_usrreq.c (17096) |
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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 --- 17 unchanged lines hidden (view full) --- 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 | 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 --- 17 unchanged lines hidden (view full) --- 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 * $Id: tcp_usrreq.c,v 1.21 1995/12/06 23:37:42 bde Exp $ | 34 * $Id: tcp_usrreq.c,v 1.22 1996/03/11 15:13:37 davidg Exp $ |
35 */ 36 37#include <sys/param.h> 38#include <sys/queue.h> 39#include <sys/systm.h> 40#include <sys/kernel.h> 41#include <sys/sysctl.h> 42#include <sys/malloc.h> --- 29 unchanged lines hidden (view full) --- 72extern char *tcpstates[]; 73 74static int tcp_attach __P((struct socket *)); 75static int tcp_connect __P((struct tcpcb *, struct mbuf *)); 76static struct tcpcb * 77 tcp_disconnect __P((struct tcpcb *)); 78static struct tcpcb * 79 tcp_usrclosed __P((struct tcpcb *)); | 35 */ 36 37#include <sys/param.h> 38#include <sys/queue.h> 39#include <sys/systm.h> 40#include <sys/kernel.h> 41#include <sys/sysctl.h> 42#include <sys/malloc.h> --- 29 unchanged lines hidden (view full) --- 72extern char *tcpstates[]; 73 74static int tcp_attach __P((struct socket *)); 75static int tcp_connect __P((struct tcpcb *, struct mbuf *)); 76static struct tcpcb * 77 tcp_disconnect __P((struct tcpcb *)); 78static struct tcpcb * 79 tcp_usrclosed __P((struct tcpcb *)); |
80 81#ifdef notdef |
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80/* 81 * Process a TCP user request for TCP tb. If this is a send request 82 * then m is the mbuf chain of send data. If this is a timer expiration 83 * (called from the software clock routine), then timertype tells which timer. 84 */ 85/*ARGSUSED*/ 86int 87tcp_usrreq(so, req, m, nam, control) --- 298 unchanged lines hidden (view full) --- 386 } 387#ifdef TCPDEBUG 388 if (tp && (so->so_options & SO_DEBUG)) 389 tcp_trace(TA_USER, ostate, tp, (struct tcpiphdr *)0, req); 390#endif 391 splx(s); 392 return (error); 393} | 82/* 83 * Process a TCP user request for TCP tb. If this is a send request 84 * then m is the mbuf chain of send data. If this is a timer expiration 85 * (called from the software clock routine), then timertype tells which timer. 86 */ 87/*ARGSUSED*/ 88int 89tcp_usrreq(so, req, m, nam, control) --- 298 unchanged lines hidden (view full) --- 388 } 389#ifdef TCPDEBUG 390 if (tp && (so->so_options & SO_DEBUG)) 391 tcp_trace(TA_USER, ostate, tp, (struct tcpiphdr *)0, req); 392#endif 393 splx(s); 394 return (error); 395} |
396#endif |
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394 | 397 |
398#ifdef TCPDEBUG 399#define TCPDEBUG0 int ostate 400#define TCPDEBUG1() ostate = tp ? tp->t_state : 0 401#define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) && \ 402 tcp_trace(TA_USER, ostate, tp, 0, req) 403#else 404#define TCPDEBUG0 405#define TCPDEBUG1() 406#define TCPDEBUG2(req) 407#endif 408 |
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395/* | 409/* |
410 * TCP attaches to socket via pru_attach(), reserving space, 411 * and an internet control block. 412 */ 413static int 414tcp_usr_attach(struct socket *so, int proto) 415{ 416 int s = splnet(); 417 int error; 418 struct inpcb *inp = sotoinpcb(so); 419 struct tcpcb *tp = 0; 420 TCPDEBUG0; 421 422 TCPDEBUG1(); 423 if (inp) { 424 error = EISCONN; 425 goto out; 426 } 427 428 error = tcp_attach(so); 429 if (error) 430 goto out; 431 432 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 433 so->so_linger = TCP_LINGERTIME * hz; 434 tp = sototcpcb(so); 435out: 436 TCPDEBUG2(PRU_ATTACH); 437 splx(s); 438 return error; 439} 440 441/* 442 * pru_detach() detaches the TCP protocol from the socket. 443 * If the protocol state is non-embryonic, then can't 444 * do this directly: have to initiate a pru_disconnect(), 445 * which may finish later; embryonic TCB's can just 446 * be discarded here. 447 */ 448static int 449tcp_usr_detach(struct socket *so) 450{ 451 int s = splnet(); 452 int error = 0; 453 struct inpcb *inp = sotoinpcb(so); 454 struct tcpcb *tp; 455 TCPDEBUG0; 456 457 if (inp == 0) { 458 splx(s); 459 return EINVAL; /* XXX */ 460 } 461 tp = intotcpcb(inp); 462 TCPDEBUG1(); 463 if (tp->t_state > TCPS_LISTEN) 464 tp = tcp_disconnect(tp); 465 else 466 tp = tcp_close(tp); 467 468 TCPDEBUG2(PRU_DETACH); 469 splx(s); 470 return error; 471} 472 473#define COMMON_START() TCPDEBUG0; \ 474 do { \ 475 if (inp == 0) { \ 476 splx(s); \ 477 return EINVAL; \ 478 } \ 479 tp = intotcpcb(inp); \ 480 TCPDEBUG1(); \ 481 } while(0) 482 483#define COMMON_END(req) out: TCPDEBUG2(req); splx(s); return error; goto out 484 485 486/* 487 * Give the socket an address. 488 */ 489static int 490tcp_usr_bind(struct socket *so, struct mbuf *nam) 491{ 492 int s = splnet(); 493 int error = 0; 494 struct inpcb *inp = sotoinpcb(so); 495 struct tcpcb *tp; 496 struct sockaddr_in *sinp; 497 498 COMMON_START(); 499 500 /* 501 * Must check for multicast addresses and disallow binding 502 * to them. 503 */ 504 sinp = mtod(nam, struct sockaddr_in *); 505 if (sinp->sin_family == AF_INET && 506 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 507 error = EAFNOSUPPORT; 508 goto out; 509 } 510 error = in_pcbbind(inp, nam); 511 if (error) 512 goto out; 513 COMMON_END(PRU_BIND); 514 515} 516 517/* 518 * Prepare to accept connections. 519 */ 520static int 521tcp_usr_listen(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 if (inp->inp_lport == 0) 530 error = in_pcbbind(inp, NULL); 531 if (error == 0) 532 tp->t_state = TCPS_LISTEN; 533 COMMON_END(PRU_LISTEN); 534} 535 536/* 537 * Initiate connection to peer. 538 * Create a template for use in transmissions on this connection. 539 * Enter SYN_SENT state, and mark socket as connecting. 540 * Start keep-alive timer, and seed output sequence space. 541 * Send initial segment on connection. 542 */ 543static int 544tcp_usr_connect(struct socket *so, struct mbuf *nam) 545{ 546 int s = splnet(); 547 int error = 0; 548 struct inpcb *inp = sotoinpcb(so); 549 struct tcpcb *tp; 550 struct sockaddr_in *sinp; 551 552 COMMON_START(); 553 554 /* 555 * Must disallow TCP ``connections'' to multicast addresses. 556 */ 557 sinp = mtod(nam, struct sockaddr_in *); 558 if (sinp->sin_family == AF_INET 559 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 560 error = EAFNOSUPPORT; 561 goto out; 562 } 563 564 if ((error = tcp_connect(tp, nam)) != 0) 565 goto out; 566 error = tcp_output(tp); 567 COMMON_END(PRU_CONNECT); 568} 569 570/* 571 * Initiate disconnect from peer. 572 * If connection never passed embryonic stage, just drop; 573 * else if don't need to let data drain, then can just drop anyways, 574 * else have to begin TCP shutdown process: mark socket disconnecting, 575 * drain unread data, state switch to reflect user close, and 576 * send segment (e.g. FIN) to peer. Socket will be really disconnected 577 * when peer sends FIN and acks ours. 578 * 579 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 580 */ 581static int 582tcp_usr_disconnect(struct socket *so) 583{ 584 int s = splnet(); 585 int error = 0; 586 struct inpcb *inp = sotoinpcb(so); 587 struct tcpcb *tp; 588 589 COMMON_START(); 590 tp = tcp_disconnect(tp); 591 COMMON_END(PRU_DISCONNECT); 592} 593 594/* 595 * Accept a connection. Essentially all the work is 596 * done at higher levels; just return the address 597 * of the peer, storing through addr. 598 */ 599static int 600tcp_usr_accept(struct socket *so, struct mbuf *nam) 601{ 602 int s = splnet(); 603 int error = 0; 604 struct inpcb *inp = sotoinpcb(so); 605 struct tcpcb *tp; 606 607 COMMON_START(); 608 in_setpeeraddr(inp, nam); 609 COMMON_END(PRU_ACCEPT); 610} 611 612/* 613 * Mark the connection as being incapable of further output. 614 */ 615static int 616tcp_usr_shutdown(struct socket *so) 617{ 618 int s = splnet(); 619 int error = 0; 620 struct inpcb *inp = sotoinpcb(so); 621 struct tcpcb *tp; 622 623 COMMON_START(); 624 socantsendmore(so); 625 tp = tcp_usrclosed(tp); 626 if (tp) 627 error = tcp_output(tp); 628 COMMON_END(PRU_SHUTDOWN); 629} 630 631/* 632 * After a receive, possibly send window update to peer. 633 */ 634static int 635tcp_usr_rcvd(struct socket *so, int flags) 636{ 637 int s = splnet(); 638 int error = 0; 639 struct inpcb *inp = sotoinpcb(so); 640 struct tcpcb *tp; 641 642 COMMON_START(); 643 tcp_output(tp); 644 COMMON_END(PRU_RCVD); 645} 646 647/* 648 * Do a send by putting data in output queue and updating urgent 649 * marker if URG set. Possibly send more data. 650 */ 651static int 652tcp_usr_send(struct socket *so, int flags, struct mbuf *m, struct mbuf *nam, 653 struct mbuf *control) 654{ 655 int s = splnet(); 656 int error = 0; 657 struct inpcb *inp = sotoinpcb(so); 658 struct tcpcb *tp; 659 660 COMMON_START(); 661 if (control && control->m_len) { 662 m_freem(control); /* XXX shouldn't caller do this??? */ 663 if (m) 664 m_freem(m); 665 return EINVAL; 666 } 667 668 if(!(flags & PRUS_OOB)) { 669 sbappend(&so->so_snd, m); 670 if (nam && tp->t_state < TCPS_SYN_SENT) { 671 /* 672 * Do implied connect if not yet connected, 673 * initialize window to default value, and 674 * initialize maxseg/maxopd using peer's cached 675 * MSS. 676 */ 677 error = tcp_connect(tp, nam); 678 if (error) 679 goto out; 680 tp->snd_wnd = TTCP_CLIENT_SND_WND; 681 tcp_mss(tp, -1); 682 } 683 684 if (flags & PRUS_EOF) { 685 /* 686 * Close the send side of the connection after 687 * the data is sent. 688 */ 689 socantsendmore(so); 690 tp = tcp_usrclosed(tp); 691 } 692 if (tp != NULL) 693 error = tcp_output(tp); 694 } else { 695 if (sbspace(&so->so_snd) < -512) { 696 m_freem(m); 697 error = ENOBUFS; 698 goto out; 699 } 700 /* 701 * According to RFC961 (Assigned Protocols), 702 * the urgent pointer points to the last octet 703 * of urgent data. We continue, however, 704 * to consider it to indicate the first octet 705 * of data past the urgent section. 706 * Otherwise, snd_up should be one lower. 707 */ 708 sbappend(&so->so_snd, m); 709 tp->snd_up = tp->snd_una + so->so_snd.sb_cc; 710 tp->t_force = 1; 711 error = tcp_output(tp); 712 tp->t_force = 0; 713 } 714 COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB : 715 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 716} 717 718/* 719 * Abort the TCP. 720 */ 721static int 722tcp_usr_abort(struct socket *so) 723{ 724 int s = splnet(); 725 int error = 0; 726 struct inpcb *inp = sotoinpcb(so); 727 struct tcpcb *tp; 728 729 COMMON_START(); 730 tp = tcp_drop(tp, ECONNABORTED); 731 COMMON_END(PRU_ABORT); 732} 733 734/* 735 * Fill in st_bklsize for fstat() operations on a socket. 736 */ 737static int 738tcp_usr_sense(struct socket *so, struct stat *sb) 739{ 740 int s = splnet(); 741 742 sb->st_blksize = so->so_snd.sb_hiwat; 743 splx(s); 744 return 0; 745} 746 747/* 748 * Receive out-of-band data. 749 */ 750static int 751tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 752{ 753 int s = splnet(); 754 int error = 0; 755 struct inpcb *inp = sotoinpcb(so); 756 struct tcpcb *tp; 757 758 COMMON_START(); 759 if ((so->so_oobmark == 0 && 760 (so->so_state & SS_RCVATMARK) == 0) || 761 so->so_options & SO_OOBINLINE || 762 tp->t_oobflags & TCPOOB_HADDATA) { 763 error = EINVAL; 764 goto out; 765 } 766 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 767 error = EWOULDBLOCK; 768 goto out; 769 } 770 m->m_len = 1; 771 *mtod(m, caddr_t) = tp->t_iobc; 772 if ((flags & MSG_PEEK) == 0) 773 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 774 COMMON_END(PRU_RCVOOB); 775} 776 777static int 778tcp_usr_sockaddr(struct socket *so, struct mbuf *nam) 779{ 780 int s = splnet(); 781 int error = 0; 782 struct inpcb *inp = sotoinpcb(so); 783 struct tcpcb *tp; 784 785 COMMON_START(); 786 in_setsockaddr(inp, nam); 787 COMMON_END(PRU_SOCKADDR); 788} 789 790static int 791tcp_usr_peeraddr(struct socket *so, struct mbuf *nam) 792{ 793 int s = splnet(); 794 int error = 0; 795 struct inpcb *inp = sotoinpcb(so); 796 struct tcpcb *tp; 797 798 COMMON_START(); 799 in_setpeeraddr(inp, nam); 800 COMMON_END(PRU_PEERADDR); 801} 802 803/* 804 * XXX - this should just be a call to in_control, but we need to get 805 * the types worked out. 806 */ 807static int 808tcp_usr_control(struct socket *so, int cmd, caddr_t arg, struct ifnet *ifp) 809{ 810 return in_control(so, cmd, arg, ifp); 811} 812 813/* xxx - should be const */ 814struct pr_usrreqs tcp_usrreqs = { 815 tcp_usr_abort, tcp_usr_accept, tcp_usr_attach, tcp_usr_bind, 816 tcp_usr_connect, pru_connect2_notsupp, tcp_usr_control, tcp_usr_detach, 817 tcp_usr_disconnect, tcp_usr_listen, tcp_usr_peeraddr, tcp_usr_rcvd, 818 tcp_usr_rcvoob, tcp_usr_send, tcp_usr_sense, tcp_usr_shutdown, 819 tcp_usr_sockaddr 820}; 821 822/* |
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396 * Common subroutine to open a TCP connection to remote host specified 397 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 398 * port number if needed. Call in_pcbladdr to do the routing and to choose 399 * a local host address (interface). If there is an existing incarnation 400 * of the same connection in TIME-WAIT state and if the remote host was 401 * sending CC options and if the connection duration was < MSL, then 402 * truncate the previous TIME-WAIT state and proceed. 403 * Initialize connection parameters and enter SYN-SENT state. --- 311 unchanged lines hidden --- | 823 * Common subroutine to open a TCP connection to remote host specified 824 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 825 * port number if needed. Call in_pcbladdr to do the routing and to choose 826 * a local host address (interface). If there is an existing incarnation 827 * of the same connection in TIME-WAIT state and if the remote host was 828 * sending CC options and if the connection duration was < MSL, then 829 * truncate the previous TIME-WAIT state and proceed. 830 * Initialize connection parameters and enter SYN-SENT state. --- 311 unchanged lines hidden --- |