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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 | /* * This module implements the (SPP-derived) Sequenced Packet eXchange * (SPX) protocol for Linux 2.1.X as specified in * NetWare SPX Services Specification, Semantics and API * Revision: 1.00 * Revision Date: February 9, 1993 * * Developers: * Jay Schulist <Jay.Schulist@spacs.k12.wi.us> * Jim Freeman <jfree@caldera.com> * * Changes: * Alan Cox : Fixed an skb_unshare check for NULL * that crashed it under load. Renamed and * made static the ipx ops. Removed the hack * ipx methods interface. Dropped AF_SPX - its * the wrong abstraction. * Eduardo Trapani : Added a check for the return value of * ipx_if_offset that crashed sock_alloc_send_skb. * Added spx_datagram_poll() so that select() * works now on SPX sockets. Added updating * of the alloc count to follow rmt_seq. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * None of the authors or maintainers or their employers admit * liability nor provide warranty for any of this software. * This material is provided "as is" and at no charge. */ #include <linux/config.h> #if defined(CONFIG_SPX) || defined(CONFIG_SPX_MODULE) #include <linux/module.h> #include <net/ipx.h> #include <net/spx.h> #include <net/sock.h> #include <asm/byteorder.h> #include <asm/uaccess.h> #include <linux/uio.h> #include <linux/unistd.h> #include <linux/poll.h> static struct proto_ops *ipx_operations; static struct proto_ops spx_ops; static __u16 connids; /* Functions needed for SPX connection start up */ static int spx_transmit(struct sock *sk,struct sk_buff *skb,int type,int len); static void spx_retransmit(unsigned long data); static void spx_watchdog(unsigned long data); void spx_rcv(struct sock *sk, int bytes); extern void ipx_remove_socket(struct sock *sk); /* Datagram poll: the same code as datagram_poll() in net/core but the right spx buffers are looked at and there is no question on the type of the socket */ static unsigned int spx_datagram_poll(struct file * file, struct socket *sock, poll_table *wait) { struct sock *sk = sock->sk; struct spx_opt *pdata = &sk->tp_pinfo.af_spx; unsigned int mask; poll_wait(file, sk->sleep, wait); mask = 0; /* exceptional events? */ if (sk->err || !skb_queue_empty(&sk->error_queue)) mask |= POLLERR; if (sk->shutdown & RCV_SHUTDOWN) mask |= POLLHUP; /* readable? */ if (!skb_queue_empty(&pdata->rcv_queue)) mask |= POLLIN | POLLRDNORM; /* Need to check for termination and startup */ if (sk->state==TCP_CLOSE) mask |= POLLHUP; /* connection hasn't started yet? */ if (sk->state == TCP_SYN_SENT) return mask; /* writable? */ if (sock_writeable(sk)) mask |= POLLOUT | POLLWRNORM | POLLWRBAND; else sk->socket->flags |= SO_NOSPACE; return mask; } /* Create the SPX specific data */ static int spx_sock_init(struct sock *sk) { struct spx_opt *pdata = &sk->tp_pinfo.af_spx; pdata->state = SPX_CLOSED; pdata->sequence = 0; pdata->acknowledge = 0; pdata->source_connid = htons(connids); pdata->rmt_seq = 0; connids++; pdata->owner = (void *)sk; pdata->sndbuf = sk->sndbuf; pdata->watchdog.function = spx_watchdog; pdata->watchdog.data = (unsigned long)sk; pdata->wd_interval = VERIFY_TIMEOUT; pdata->retransmit.function = spx_retransmit; pdata->retransmit.data = (unsigned long)sk; pdata->retransmits = 0; pdata->retries = 0; pdata->max_retries = RETRY_COUNT; skb_queue_head_init(&pdata->rcv_queue); skb_queue_head_init(&pdata->transmit_queue); skb_queue_head_init(&pdata->retransmit_queue); return (0); } static int spx_create(struct socket *sock, int protocol) { struct sock *sk; /* * Called on connection receive so cannot be GFP_KERNEL */ sk = sk_alloc(PF_IPX, GFP_ATOMIC, 1); if(sk == NULL) return (-ENOMEM); switch(sock->type) { case SOCK_SEQPACKET: sock->ops = &spx_ops; break; default: sk_free(sk); return (-ESOCKTNOSUPPORT); } sock_init_data(sock, sk); spx_sock_init(sk); sk->data_ready = spx_rcv; sk->destruct = NULL; sk->no_check = 1; MOD_INC_USE_COUNT; return (0); } void spx_close_socket(struct sock *sk) { struct spx_opt *pdata = &sk->tp_pinfo.af_spx; pdata->state = SPX_CLOSED; sk->state = TCP_CLOSE; del_timer(&pdata->retransmit); del_timer(&pdata->watchdog); } void spx_destroy_socket(struct sock *sk) { struct spx_opt *pdata = &sk->tp_pinfo.af_spx; struct sk_buff *skb; ipx_remove_socket(sk); while((skb = skb_dequeue(&sk->receive_queue)) != NULL) kfree_skb(skb); while((skb = skb_dequeue(&pdata->transmit_queue)) != NULL) kfree_skb(skb); while((skb = skb_dequeue(&pdata->retransmit_queue)) != NULL) kfree_skb(skb); while((skb = skb_dequeue(&pdata->rcv_queue)) != NULL) kfree_skb(skb); sk_free(sk); MOD_DEC_USE_COUNT; } /* Release an SPX socket */ static int spx_release(struct socket *sock) { struct sock *sk = sock->sk; struct spx_opt *pdata = &sk->tp_pinfo.af_spx; if(sk == NULL) return (0); if(!sk->dead) sk->state_change(sk); sk->dead = 1; if(pdata->state != SPX_CLOSED) { spx_transmit(sk, NULL, DISCON, 0); spx_close_socket(sk); } sock->sk = NULL; sk->socket = NULL; spx_destroy_socket(sk); return (0); } /* Move a socket into listening state. */ static int spx_listen(struct socket *sock, int backlog) { struct sock *sk = sock->sk; if(sock->state != SS_UNCONNECTED) return (-EINVAL); if(sock->type != SOCK_SEQPACKET) return (-EOPNOTSUPP); if(sk->zapped != 0) return (-EAGAIN); sk->max_ack_backlog = backlog; if(sk->state != TCP_LISTEN) { sk->ack_backlog = 0; sk->state = TCP_LISTEN; } sk->socket->flags |= SO_ACCEPTCON; return (0); } /* Accept a pending SPX connection */ static int spx_accept(struct socket *sock, struct socket *newsock, int flags) { struct sock *sk; struct sock *newsk; struct sk_buff *skb; int err; if(sock->sk == NULL) return (-EINVAL); sk = sock->sk; if((sock->state != SS_UNCONNECTED) || !(sock->flags & SO_ACCEPTCON)) return (-EINVAL); if(sock->type != SOCK_SEQPACKET) return (-EOPNOTSUPP); if(sk->state != TCP_LISTEN) return (-EINVAL); cli(); do { skb = skb_dequeue(&sk->receive_queue); if(skb == NULL) { if(flags & O_NONBLOCK) { sti(); return (-EWOULDBLOCK); } interruptible_sleep_on(sk->sleep); if(signal_pending(current)) { sti(); return (-ERESTARTSYS); } } } while (skb == NULL); newsk = skb->sk; newsk->pair = NULL; sti(); err = spx_transmit(newsk, skb, CONACK, 0); /* Connection ACK */ if(err) return (err); /* Now attach up the new socket */ sock->sk = NULL; sk->ack_backlog--; newsock->sk = newsk; newsk->state = TCP_ESTABLISHED; newsk->protinfo.af_ipx.dest_addr = newsk->tp_pinfo.af_spx.dest_addr; return (0); } /* Build a connection to an SPX socket */ static int spx_connect(struct socket *sock, struct sockaddr *uaddr, int addr_len, int flags) { struct sock *sk = sock->sk; struct spx_opt *pdata = &sk->tp_pinfo.af_spx; struct sockaddr_ipx src; struct sk_buff *skb; int size, err; size = sizeof(src); err = ipx_operations->getname(sock, (struct sockaddr *)&src, &size, 0); if(err) return (err); pdata->source_addr.net = src.sipx_network; memcpy(pdata->source_addr.node, src.sipx_node, IPX_NODE_LEN); pdata->source_addr.sock = (unsigned short)src.sipx_port; err = ipx_operations->connect(sock, uaddr, addr_len, flags); if(err) return (err); pdata->dest_addr = sk->protinfo.af_ipx.dest_addr; pdata->state = SPX_CONNECTING; sock->state = SS_CONNECTING; sk->state = TCP_SYN_SENT; /* Send Connection request */ err = spx_transmit(sk, NULL, CONREQ, 0); if(err) return (err); cli(); do { skb = skb_dequeue(&sk->receive_queue); if(skb == NULL) { if(flags & O_NONBLOCK) { sti(); return (-EWOULDBLOCK); } interruptible_sleep_on(sk->sleep); if(signal_pending(current)) { sti(); return (-ERESTARTSYS); } } } while (skb == NULL); if(pdata->state == SPX_CLOSED) { sti(); del_timer(&pdata->watchdog); return (-ETIMEDOUT); } sock->state = SS_CONNECTED; sk->state = TCP_ESTABLISHED; kfree_skb(skb); sti(); return (0); } /* * Calculate the timeout for a packet. Thankfully SPX has a large * fudge factor (3/4 secs) and does not pay much attention to RTT. * As we simply have a default retry time of 1*HZ and a max retry * time of 5*HZ. Between those values we increase the timeout based * on the number of retransmit tries. * * FixMe: This is quite fake, but will work for now. (JS) */ static inline unsigned long spx_calc_rtt(int tries) { if(tries < 1) return (RETRY_TIME); if(tries > 5) return (MAX_RETRY_DELAY); return (tries * HZ); } static int spx_route_skb(struct spx_opt *pdata, struct sk_buff *skb, int type) { struct sk_buff *skb2; int err = 0; skb = skb_unshare(skb, GFP_ATOMIC); if(skb == NULL) return (-ENOBUFS); switch(type) { case (CONREQ): case (DATA): if(!skb_queue_empty(&pdata->retransmit_queue)) { skb_queue_tail(&pdata->transmit_queue, skb); return 0; } case (TQUEUE): pdata->retransmit.expires = jiffies + spx_calc_rtt(0); add_timer(&pdata->retransmit); skb2 = skb_clone(skb, GFP_BUFFER); if(skb2 == NULL) return -ENOBUFS; skb_queue_tail(&pdata->retransmit_queue, skb2); case (ACK): case (CONACK): case (WDREQ): case (WDACK): case (DISCON): case (DISACK): case (RETRAN): default: /* Send data */ err = ipxrtr_route_skb(skb); if(err) kfree_skb(skb); } return (err); } /* SPX packet transmit engine */ static int spx_transmit(struct sock *sk, struct sk_buff *skb, int type, int len) { struct spx_opt *pdata = &sk->tp_pinfo.af_spx; struct ipxspxhdr *ipxh; unsigned long flags; int err; if(skb == NULL) { int offset = ipx_if_offset(pdata->dest_addr.net); int size = offset + sizeof(struct ipxspxhdr); if (offset < 0) /* ENETUNREACH */ return(-ENETUNREACH); save_flags(flags); cli(); skb = sock_alloc_send_skb(sk, size, 1, 0, &err); if(skb == NULL) return (-ENOMEM); skb_reserve(skb, offset); skb->h.raw = skb->nh.raw = skb_put(skb,sizeof(struct ipxspxhdr)); restore_flags(flags); } /* IPX header */ ipxh = (struct ipxspxhdr *)skb->nh.raw; ipxh->ipx.ipx_checksum = 0xFFFF; ipxh->ipx.ipx_pktsize = htons(SPX_SYS_PKT_LEN); ipxh->ipx.ipx_tctrl = 0; ipxh->ipx.ipx_type = IPX_TYPE_SPX; ipxh->ipx.ipx_dest = pdata->dest_addr; ipxh->ipx.ipx_source = pdata->source_addr; /* SPX header */ ipxh->spx.dtype = 0; ipxh->spx.sequence = htons(pdata->sequence); ipxh->spx.ackseq = htons(pdata->rmt_seq); ipxh->spx.sconn = pdata->source_connid; ipxh->spx.dconn = pdata->dest_connid; ipxh->spx.allocseq = htons(pdata->alloc); /* Reset/Set WD timer */ del_timer(&pdata->watchdog); pdata->watchdog.expires = jiffies + VERIFY_TIMEOUT; add_timer(&pdata->watchdog); switch(type) { case (DATA): /* Data */ ipxh->ipx.ipx_pktsize = htons(SPX_SYS_PKT_LEN + len); ipxh->spx.cctl = (CCTL_ACK | CCTL_EOM); pdata->sequence++; break; case (ACK): /* ACK */ pdata->rmt_seq++; case (WDACK): /* WD ACK */ case (CONACK): /* Connection ACK */ ipxh->spx.cctl = CCTL_SYS; ipxh->spx.ackseq = htons(pdata->rmt_seq); break; case (CONREQ): /* Connection Request */ del_timer(&pdata->watchdog); case (WDREQ): /* WD Request */ pdata->source_connid = htons(connids++); pdata->dest_connid = 0xFFFF; pdata->alloc = 3 + pdata->rmt_seq; ipxh->spx.cctl = (CCTL_ACK | CCTL_SYS); ipxh->spx.sconn = pdata->source_connid; ipxh->spx.dconn = pdata->dest_connid; ipxh->spx.allocseq = htons(pdata->alloc); break; case (DISCON): /* Informed Disconnect */ ipxh->spx.cctl = CCTL_ACK; ipxh->spx.dtype = SPX_DTYPE_ECONN; break; case (DISACK): /* Informed Disconnect ACK */ ipxh->spx.cctl = 0; ipxh->spx.dtype = SPX_DTYPE_ECACK; ipxh->spx.sequence = 0; ipxh->spx.ackseq = htons(pdata->rmt_seq++); break; default: return (-EOPNOTSUPP); } /* Send data */ return (spx_route_skb(pdata, skb, type)); } /* Check the state of the connection and send a WD request if needed. */ static void spx_watchdog(unsigned long data) { struct sock *sk = (struct sock*)data; struct spx_opt *pdata = &sk->tp_pinfo.af_spx; del_timer(&pdata->watchdog); if(pdata->state == SPX_CLOSED) return; if(pdata->retries > pdata->max_retries) { spx_close_socket(sk); /* Unilateral Abort */ return; } /* Send WD request */ spx_transmit(sk, NULL, WDREQ, 0); pdata->retries++; return; } static void spx_retransmit(unsigned long data) { struct sock *sk = (struct sock*)data; struct spx_opt *pdata = &sk->tp_pinfo.af_spx; struct sk_buff *skb; unsigned long flags; int err; del_timer(&pdata->retransmit); if(pdata->state == SPX_CLOSED) return; if(pdata->retransmits > RETRY_COUNT) { spx_close_socket(sk); /* Unilateral Abort */ return; } /* Need to leave skb on the queue, aye the fear */ save_flags(flags); cli(); skb = skb_peek(&pdata->retransmit_queue); if(skb_cloned(skb)) skb = skb_copy(skb, GFP_ATOMIC); else skb = skb_clone(skb, GFP_ATOMIC); restore_flags(flags); pdata->retransmit.expires = jiffies + spx_calc_rtt(pdata->retransmits); add_timer(&pdata->retransmit); err = spx_route_skb(pdata, skb, RETRAN); pdata->retransmits++; return; } /* Check packet for retransmission, ConReqAck aware */ static int spx_retransmit_chk(struct spx_opt *pdata, int ackseq, int type) { struct ipxspxhdr *ipxh; struct sk_buff *skb; skb = skb_dequeue(&pdata->retransmit_queue); if(!skb) return (-ENOENT); /* Check Data/ACK seq */ switch(type) { case ACK: /* Check Sequence, Should == 1 */ ipxh = (struct ipxspxhdr *)skb->nh.raw; if(!(ntohs(ipxh->spx.sequence) - htons(ackseq))) break; case CONACK: del_timer(&pdata->retransmit); pdata->retransmits = 0; kfree_skb(skb); if(skb_queue_empty(&pdata->retransmit_queue)) { skb = skb_dequeue(&pdata->transmit_queue); if(skb != NULL) spx_route_skb(pdata, skb, TQUEUE); } return (0); } skb_queue_head(&pdata->retransmit_queue, skb); return (-1); } /* SPX packet receive engine */ void spx_rcv(struct sock *sk, int bytes) { struct sk_buff *skb; struct ipxspxhdr *ipxh; struct spx_opt *pdata = &sk->tp_pinfo.af_spx; skb = skb_dequeue(&sk->receive_queue); if(skb == NULL) return; ipxh = (struct ipxspxhdr *)skb->nh.raw; /* Can't receive on a closed connection */ if((pdata->state == SPX_CLOSED) && (ipxh->spx.sequence != 0)) goto toss_skb; if(ntohs(ipxh->ipx.ipx_pktsize) < SPX_SYS_PKT_LEN) goto toss_skb; if(ipxh->ipx.ipx_type != IPX_TYPE_SPX) goto toss_skb; if(ntohs(ipxh->spx.ackseq) > pdata->sequence) goto toss_skb; /* Reset WD timer on any received packet */ del_timer(&pdata->watchdog); pdata->retries = 0; pdata->watchdog.expires = jiffies + ABORT_TIMEOUT; add_timer(&pdata->watchdog); switch(ipxh->spx.cctl) { case (CCTL_SYS | CCTL_ACK): if((ipxh->spx.sequence == 0) /* ConReq */ && (ipxh->spx.ackseq == 0) && (ipxh->spx.dconn == 0xFFFF)) { pdata->state = SPX_CONNECTED; pdata->dest_addr = ipxh->ipx.ipx_source; pdata->source_addr = ipxh->ipx.ipx_dest; pdata->dest_connid = ipxh->spx.sconn; pdata->alloc = 3 + ntohs(ipxh->spx.sequence); skb_queue_tail(&sk->receive_queue, skb); wake_up_interruptible(sk->sleep); } else /* WD Request */ spx_transmit(sk, skb, WDACK, 0); goto finish; case CCTL_SYS: /* ACK */ if((ipxh->spx.dtype == 0) /* ConReq ACK */ && (ipxh->spx.sconn != 0xFFFF) && (ipxh->spx.dconn != 0xFFFF) && (ipxh->spx.sequence == 0) && (ipxh->spx.ackseq == 0) && (pdata->state != SPX_CONNECTED)) { pdata->state = SPX_CONNECTED; pdata->dest_connid = ipxh->spx.sconn; if(spx_retransmit_chk(pdata, 0, CONACK) < 0) goto toss_skb; skb_queue_tail(&sk->receive_queue, skb); wake_up_interruptible(sk->sleep); goto finish; } spx_retransmit_chk(pdata, ipxh->spx.ackseq, ACK); goto toss_skb; case (CCTL_ACK): /* Informed Disconnect */ if(ipxh->spx.dtype == SPX_DTYPE_ECONN) { spx_transmit(sk, skb, DISACK, 0); spx_close_socket(sk); goto finish; } /* Fall through */ default: if(ntohs(ipxh->spx.sequence) == pdata->rmt_seq) { pdata->rmt_seq = ntohs(ipxh->spx.sequence); pdata->rmt_ack = ntohs(ipxh->spx.ackseq); pdata->alloc = pdata->rmt_seq + 3; if(pdata->rmt_ack > 0 || pdata->rmt_ack == 0) spx_retransmit_chk(pdata,pdata->rmt_ack, ACK); skb_queue_tail(&pdata->rcv_queue, skb); wake_up_interruptible(sk->sleep); if(ipxh->spx.cctl&CCTL_ACK) spx_transmit(sk, NULL, ACK, 0); goto finish; } if(ipxh->spx.dtype == SPX_DTYPE_ECACK) { if(pdata->state != SPX_CLOSED) spx_close_socket(sk); goto toss_skb; } } toss_skb: /* Catch All */ kfree_skb(skb); finish: return; } /* Get message/packet data from user-land */ static int spx_sendmsg(struct socket *sock, struct msghdr *msg, int len, struct scm_cookie *scm) { struct sock *sk = sock->sk; int flags = msg->msg_flags; struct sk_buff *skb; int err, offset, size; if(len > 534) return (-EMSGSIZE); if(sk->zapped) return (-ENOTCONN); /* Socket not bound */ if(flags&~MSG_DONTWAIT) return (-EINVAL); offset = ipx_if_offset(sk->tp_pinfo.af_spx.dest_addr.net); size = offset + sizeof(struct ipxspxhdr) + len; cli(); skb = sock_alloc_send_skb(sk, size, 0, flags&MSG_DONTWAIT, &err); if(skb == NULL) return (err); sti(); skb->sk = sk; skb_reserve(skb, offset); skb->h.raw = skb->nh.raw = skb_put(skb, sizeof(struct ipxspxhdr)); err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); if(err) { kfree_skb(skb); return (-EFAULT); } err = spx_transmit(sk, skb, DATA, len); if(err) return (-EAGAIN); return (len); } /* Send message/packet data to user-land */ static int spx_recvmsg(struct socket *sock, struct msghdr *msg, int size, int flags, struct scm_cookie *scm) { struct sk_buff *skb; struct ipxspxhdr *ispxh; struct sock *sk = sock->sk; struct spx_opt *pdata = &sk->tp_pinfo.af_spx; struct sockaddr_ipx *sipx = (struct sockaddr_ipx *)msg->msg_name; int copied, err; if(sk->zapped) return (-ENOTCONN); /* Socket not bound */ lock_sock(sk); restart: while(skb_queue_empty(&pdata->rcv_queue)) /* No data */ { /* Socket errors? */ err = sock_error(sk); if(err) return (err); /* Socket shut down? */ if(sk->shutdown & RCV_SHUTDOWN) return (-ESHUTDOWN); /* handle signals */ if(signal_pending(current)) return (-ERESTARTSYS); /* User doesn't want to wait */ if(flags&MSG_DONTWAIT) return (-EAGAIN); release_sock(sk); save_flags(flags); cli(); if(skb_peek(&pdata->rcv_queue) == NULL) interruptible_sleep_on(sk->sleep); restore_flags(flags); lock_sock(sk); } skb = skb_dequeue(&pdata->rcv_queue); if(skb == NULL) goto restart; ispxh = (struct ipxspxhdr *)skb->nh.raw; copied = ntohs(ispxh->ipx.ipx_pktsize) - SPX_SYS_PKT_LEN; if(copied > size) { copied = size; msg->msg_flags |= MSG_TRUNC; } err = memcpy_toiovec(msg->msg_iov, skb->nh.raw+SPX_SYS_PKT_LEN, copied); if(err) return (-EFAULT); msg->msg_namelen = sizeof(*sipx); if(sipx) { sipx->sipx_family = AF_IPX; sipx->sipx_port = ispxh->ipx.ipx_source.sock; memcpy(sipx->sipx_node,ispxh->ipx.ipx_source.node,IPX_NODE_LEN); sipx->sipx_network = ispxh->ipx.ipx_source.net; sipx->sipx_type = ispxh->ipx.ipx_type; } kfree_skb(skb); release_sock(sk); return (copied); } /* * Functions which just wrap their IPX cousins */ static int spx_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) { int err; err = ipx_operations->bind(sock, uaddr, addr_len); return (err); } static int spx_getname (struct socket *sock, struct sockaddr *uaddr, int *usockaddr_len, int peer) { int err; err = ipx_operations->getname(sock, uaddr, usockaddr_len, peer); return (err); } static int spx_ioctl (struct socket *sock, unsigned int cmd, unsigned long arg) { int err; err = ipx_operations->ioctl(sock, cmd, arg); return (err); } static int spx_setsockopt(struct socket *sock, int level, int optname, char *optval, int optlen) { int err; err = ipx_operations->setsockopt(sock, level, optname, optval, optlen); return (err); } static int spx_getsockopt(struct socket *sock, int level, int optname, char *optval, int *optlen) { int err; err = ipx_operations->getsockopt(sock, level, optname, optval, optlen); return (err); } static struct proto_ops SOCKOPS_WRAPPED(spx_ops) = { PF_IPX, spx_release, spx_bind, spx_connect, sock_no_socketpair, spx_accept, spx_getname, spx_datagram_poll, spx_ioctl, spx_listen, sock_no_shutdown, spx_setsockopt, spx_getsockopt, sock_no_fcntl, spx_sendmsg, spx_recvmsg, sock_no_mmap }; #include <linux/smp_lock.h> SOCKOPS_WRAP(spx, PF_IPX); static struct net_proto_family spx_family_ops= { PF_IPX, spx_create }; void spx_proto_init(void) { int error; connids = (__u16)jiffies; /* initalize random */ error = ipx_register_spx(&ipx_operations, &spx_family_ops); if (error) printk(KERN_ERR "SPX: unable to register with IPX.\n"); /* route socket(PF_IPX, SOCK_SEQPACKET) calls through spx_create() */ printk(KERN_INFO "NET4: Sequenced Packet eXchange (SPX) 0.02 for Linux NET4.0\n"); return; } void spx_proto_finito(void) { ipx_unregister_spx(); return; } #ifdef MODULE int init_module(void) { spx_proto_init(); return 0; } void cleanup_module(void) { spx_proto_finito(); return; } #endif /* MODULE */ #endif /* CONFIG_SPX || CONFIG_SPX_MODULE */ |