Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netipx/ipx_usrreq.c
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1 /*- 2 * Copyright (c) 2004-2005 Robert N. M. Watson 3 * Copyright (c) 1995, Mike Mitchell 4 * Copyright (c) 1984, 1985, 1986, 1987, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)ipx_usrreq.c 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD: releng/6.1/sys/netipx/ipx_usrreq.c 139930 2005-01-09 05:15:59Z rwatson $"); 40 41 #include "opt_ipx.h" 42 43 #include <sys/param.h> 44 #include <sys/kernel.h> 45 #include <sys/lock.h> 46 #include <sys/mbuf.h> 47 #include <sys/protosw.h> 48 #include <sys/signalvar.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/sx.h> 52 #include <sys/sysctl.h> 53 #include <sys/systm.h> 54 55 #include <net/if.h> 56 #include <net/route.h> 57 58 #include <netinet/in.h> 59 60 #include <netipx/ipx.h> 61 #include <netipx/ipx_if.h> 62 #include <netipx/ipx_ip.h> 63 #include <netipx/ipx_pcb.h> 64 #include <netipx/ipx_var.h> 65 66 /* 67 * IPX protocol implementation. 68 */ 69 70 static int ipxsendspace = IPXSNDQ; 71 SYSCTL_INT(_net_ipx_ipx, OID_AUTO, ipxsendspace, CTLFLAG_RW, 72 &ipxsendspace, 0, ""); 73 static int ipxrecvspace = IPXRCVQ; 74 SYSCTL_INT(_net_ipx_ipx, OID_AUTO, ipxrecvspace, CTLFLAG_RW, 75 &ipxrecvspace, 0, ""); 76 77 static int ipx_usr_abort(struct socket *so); 78 static int ipx_attach(struct socket *so, int proto, struct thread *td); 79 static int ipx_bind(struct socket *so, struct sockaddr *nam, struct thread *td); 80 static int ipx_connect(struct socket *so, struct sockaddr *nam, 81 struct thread *td); 82 static int ipx_detach(struct socket *so); 83 static int ipx_disconnect(struct socket *so); 84 static int ipx_send(struct socket *so, int flags, struct mbuf *m, 85 struct sockaddr *addr, struct mbuf *control, 86 struct thread *td); 87 static int ipx_shutdown(struct socket *so); 88 static int ripx_attach(struct socket *so, int proto, struct thread *td); 89 static int ipx_output(struct ipxpcb *ipxp, struct mbuf *m0); 90 91 struct pr_usrreqs ipx_usrreqs = { 92 .pru_abort = ipx_usr_abort, 93 .pru_attach = ipx_attach, 94 .pru_bind = ipx_bind, 95 .pru_connect = ipx_connect, 96 .pru_control = ipx_control, 97 .pru_detach = ipx_detach, 98 .pru_disconnect = ipx_disconnect, 99 .pru_peeraddr = ipx_peeraddr, 100 .pru_send = ipx_send, 101 .pru_shutdown = ipx_shutdown, 102 .pru_sockaddr = ipx_sockaddr, 103 }; 104 105 struct pr_usrreqs ripx_usrreqs = { 106 .pru_abort = ipx_usr_abort, 107 .pru_attach = ripx_attach, 108 .pru_bind = ipx_bind, 109 .pru_connect = ipx_connect, 110 .pru_control = ipx_control, 111 .pru_detach = ipx_detach, 112 .pru_disconnect = ipx_disconnect, 113 .pru_peeraddr = ipx_peeraddr, 114 .pru_send = ipx_send, 115 .pru_shutdown = ipx_shutdown, 116 .pru_sockaddr = ipx_sockaddr, 117 }; 118 119 /* 120 * This may also be called for raw listeners. 121 */ 122 void 123 ipx_input(m, ipxp) 124 struct mbuf *m; 125 register struct ipxpcb *ipxp; 126 { 127 register struct ipx *ipx = mtod(m, struct ipx *); 128 struct ifnet *ifp = m->m_pkthdr.rcvif; 129 struct sockaddr_ipx ipx_ipx; 130 131 KASSERT(ipxp != NULL, ("ipx_input: NULL ipxpcb")); 132 IPX_LOCK_ASSERT(ipxp); 133 /* 134 * Construct sockaddr format source address. 135 * Stuff source address and datagram in user buffer. 136 */ 137 ipx_ipx.sipx_len = sizeof(ipx_ipx); 138 ipx_ipx.sipx_family = AF_IPX; 139 ipx_ipx.sipx_addr = ipx->ipx_sna; 140 ipx_ipx.sipx_zero[0] = '\0'; 141 ipx_ipx.sipx_zero[1] = '\0'; 142 if (ipx_neteqnn(ipx->ipx_sna.x_net, ipx_zeronet) && ifp != NULL) { 143 register struct ifaddr *ifa; 144 145 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa != NULL; 146 ifa = TAILQ_NEXT(ifa, ifa_link)) { 147 if (ifa->ifa_addr->sa_family == AF_IPX) { 148 ipx_ipx.sipx_addr.x_net = 149 IA_SIPX(ifa)->sipx_addr.x_net; 150 break; 151 } 152 } 153 } 154 ipxp->ipxp_rpt = ipx->ipx_pt; 155 if ((ipxp->ipxp_flags & IPXP_RAWIN) == 0) { 156 m->m_len -= sizeof(struct ipx); 157 m->m_pkthdr.len -= sizeof(struct ipx); 158 m->m_data += sizeof(struct ipx); 159 } 160 if (sbappendaddr(&ipxp->ipxp_socket->so_rcv, 161 (struct sockaddr *)&ipx_ipx, m, NULL) == 0) 162 m_freem(m); 163 else 164 sorwakeup(ipxp->ipxp_socket); 165 } 166 167 /* 168 * Drop connection, reporting 169 * the specified error. 170 */ 171 void 172 ipx_drop(ipxp, errno) 173 register struct ipxpcb *ipxp; 174 int errno; 175 { 176 struct socket *so = ipxp->ipxp_socket; 177 178 IPX_LIST_LOCK_ASSERT(); 179 IPX_LOCK_ASSERT(ipxp); 180 181 /* 182 * someday, in the IPX world 183 * we will generate error protocol packets 184 * announcing that the socket has gone away. 185 * 186 * XXX Probably never. IPX does not have error packets. 187 */ 188 /*if (TCPS_HAVERCVDSYN(tp->t_state)) { 189 tp->t_state = TCPS_CLOSED; 190 tcp_output(tp); 191 }*/ 192 so->so_error = errno; 193 ipx_pcbdisconnect(ipxp); 194 soisdisconnected(so); 195 } 196 197 static int 198 ipx_output(ipxp, m0) 199 struct ipxpcb *ipxp; 200 struct mbuf *m0; 201 { 202 register struct ipx *ipx; 203 register struct socket *so; 204 register int len = 0; 205 register struct route *ro; 206 struct mbuf *m; 207 struct mbuf *mprev = NULL; 208 209 IPX_LOCK_ASSERT(ipxp); 210 211 /* 212 * Calculate data length. 213 */ 214 for (m = m0; m != NULL; m = m->m_next) { 215 mprev = m; 216 len += m->m_len; 217 } 218 /* 219 * Make sure packet is actually of even length. 220 */ 221 222 if (len & 1) { 223 m = mprev; 224 if ((m->m_flags & M_EXT) == 0 && 225 (m->m_len + m->m_data < &m->m_dat[MLEN])) { 226 mtod(m, char*)[m->m_len++] = 0; 227 } else { 228 struct mbuf *m1 = m_get(M_DONTWAIT, MT_DATA); 229 230 if (m1 == NULL) { 231 m_freem(m0); 232 return (ENOBUFS); 233 } 234 m1->m_len = 1; 235 * mtod(m1, char *) = 0; 236 m->m_next = m1; 237 } 238 m0->m_pkthdr.len++; 239 } 240 241 /* 242 * Fill in mbuf with extended IPX header 243 * and addresses and length put into network format. 244 */ 245 m = m0; 246 if (ipxp->ipxp_flags & IPXP_RAWOUT) { 247 ipx = mtod(m, struct ipx *); 248 } else { 249 M_PREPEND(m, sizeof(struct ipx), M_DONTWAIT); 250 if (m == NULL) 251 return (ENOBUFS); 252 ipx = mtod(m, struct ipx *); 253 ipx->ipx_tc = 0; 254 ipx->ipx_pt = ipxp->ipxp_dpt; 255 ipx->ipx_sna = ipxp->ipxp_laddr; 256 ipx->ipx_dna = ipxp->ipxp_faddr; 257 len += sizeof(struct ipx); 258 } 259 260 ipx->ipx_len = htons((u_short)len); 261 262 if (ipxp->ipxp_flags & IPXP_CHECKSUM) { 263 ipx->ipx_sum = ipx_cksum(m, len); 264 } else 265 ipx->ipx_sum = 0xffff; 266 267 /* 268 * Output datagram. 269 */ 270 so = ipxp->ipxp_socket; 271 if (so->so_options & SO_DONTROUTE) 272 return (ipx_outputfl(m, (struct route *)NULL, 273 (so->so_options & SO_BROADCAST) | IPX_ROUTETOIF)); 274 /* 275 * Use cached route for previous datagram if 276 * possible. If the previous net was the same 277 * and the interface was a broadcast medium, or 278 * if the previous destination was identical, 279 * then we are ok. 280 * 281 * NB: We don't handle broadcasts because that 282 * would require 3 subroutine calls. 283 */ 284 ro = &ipxp->ipxp_route; 285 #ifdef ancient_history 286 /* 287 * I think that this will all be handled in ipx_pcbconnect! 288 */ 289 if (ro->ro_rt != NULL) { 290 if(ipx_neteq(ipxp->ipxp_lastdst, ipx->ipx_dna)) { 291 /* 292 * This assumes we have no GH type routes 293 */ 294 if (ro->ro_rt->rt_flags & RTF_HOST) { 295 if (!ipx_hosteq(ipxp->ipxp_lastdst, ipx->ipx_dna)) 296 goto re_route; 297 298 } 299 if ((ro->ro_rt->rt_flags & RTF_GATEWAY) == 0) { 300 register struct ipx_addr *dst = 301 &satoipx_addr(ro->ro_dst); 302 dst->x_host = ipx->ipx_dna.x_host; 303 } 304 /* 305 * Otherwise, we go through the same gateway 306 * and dst is already set up. 307 */ 308 } else { 309 re_route: 310 RTFREE(ro->ro_rt); 311 ro->ro_rt = NULL; 312 } 313 } 314 ipxp->ipxp_lastdst = ipx->ipx_dna; 315 #endif /* ancient_history */ 316 return (ipx_outputfl(m, ro, so->so_options & SO_BROADCAST)); 317 } 318 319 int 320 ipx_ctloutput(so, sopt) 321 struct socket *so; 322 struct sockopt *sopt; 323 { 324 struct ipxpcb *ipxp = sotoipxpcb(so); 325 int mask, error, optval; 326 short soptval; 327 struct ipx ioptval; 328 long seq; 329 330 error = 0; 331 if (ipxp == NULL) 332 return (EINVAL); 333 334 switch (sopt->sopt_dir) { 335 case SOPT_GET: 336 switch (sopt->sopt_name) { 337 case SO_ALL_PACKETS: 338 mask = IPXP_ALL_PACKETS; 339 goto get_flags; 340 341 case SO_HEADERS_ON_INPUT: 342 mask = IPXP_RAWIN; 343 goto get_flags; 344 345 case SO_IPX_CHECKSUM: 346 mask = IPXP_CHECKSUM; 347 goto get_flags; 348 349 case SO_HEADERS_ON_OUTPUT: 350 mask = IPXP_RAWOUT; 351 get_flags: 352 /* Unlocked read. */ 353 soptval = ipxp->ipxp_flags & mask; 354 error = sooptcopyout(sopt, &soptval, sizeof soptval); 355 break; 356 357 case SO_DEFAULT_HEADERS: 358 ioptval.ipx_len = 0; 359 ioptval.ipx_sum = 0; 360 ioptval.ipx_tc = 0; 361 IPX_LOCK(ipxp); 362 ioptval.ipx_pt = ipxp->ipxp_dpt; 363 ioptval.ipx_dna = ipxp->ipxp_faddr; 364 ioptval.ipx_sna = ipxp->ipxp_laddr; 365 IPX_UNLOCK(ipxp); 366 error = sooptcopyout(sopt, &soptval, sizeof soptval); 367 break; 368 369 case SO_SEQNO: 370 IPX_LIST_LOCK(); 371 seq = ipx_pexseq; 372 ipx_pexseq++; 373 IPX_LIST_UNLOCK(); 374 error = sooptcopyout(sopt, &seq, sizeof seq); 375 break; 376 377 default: 378 error = EINVAL; 379 } 380 break; 381 382 case SOPT_SET: 383 switch (sopt->sopt_name) { 384 case SO_ALL_PACKETS: 385 mask = IPXP_ALL_PACKETS; 386 goto set_head; 387 388 case SO_HEADERS_ON_INPUT: 389 mask = IPXP_RAWIN; 390 goto set_head; 391 392 case SO_IPX_CHECKSUM: 393 mask = IPXP_CHECKSUM; 394 395 case SO_HEADERS_ON_OUTPUT: 396 mask = IPXP_RAWOUT; 397 set_head: 398 error = sooptcopyin(sopt, &optval, sizeof optval, 399 sizeof optval); 400 if (error) 401 break; 402 IPX_LOCK(ipxp); 403 if (optval) 404 ipxp->ipxp_flags |= mask; 405 else 406 ipxp->ipxp_flags &= ~mask; 407 IPX_UNLOCK(ipxp); 408 break; 409 410 case SO_DEFAULT_HEADERS: 411 error = sooptcopyin(sopt, &ioptval, sizeof ioptval, 412 sizeof ioptval); 413 if (error) 414 break; 415 /* Unlocked write. */ 416 ipxp->ipxp_dpt = ioptval.ipx_pt; 417 break; 418 #ifdef IPXIP 419 case SO_IPXIP_ROUTE: 420 error = ipxip_route(so, sopt); 421 break; 422 #endif /* IPXIP */ 423 default: 424 error = EINVAL; 425 } 426 break; 427 } 428 return (error); 429 } 430 431 static int 432 ipx_usr_abort(so) 433 struct socket *so; 434 { 435 struct ipxpcb *ipxp = sotoipxpcb(so); 436 437 IPX_LIST_LOCK(); 438 IPX_LOCK(ipxp); 439 ipx_pcbdetach(ipxp); 440 IPX_LIST_UNLOCK(); 441 soisdisconnected(so); 442 ACCEPT_LOCK(); 443 SOCK_LOCK(so); 444 sotryfree(so); 445 return (0); 446 } 447 448 static int 449 ipx_attach(so, proto, td) 450 struct socket *so; 451 int proto; 452 struct thread *td; 453 { 454 struct ipxpcb *ipxp = sotoipxpcb(so); 455 int error; 456 457 if (ipxp != NULL) 458 return (EINVAL); 459 IPX_LIST_LOCK(); 460 error = ipx_pcballoc(so, &ipxpcb_list, td); 461 IPX_LIST_UNLOCK(); 462 if (error == 0) 463 error = soreserve(so, ipxsendspace, ipxrecvspace); 464 return (error); 465 } 466 467 static int 468 ipx_bind(so, nam, td) 469 struct socket *so; 470 struct sockaddr *nam; 471 struct thread *td; 472 { 473 struct ipxpcb *ipxp = sotoipxpcb(so); 474 int error; 475 476 IPX_LIST_LOCK(); 477 IPX_LOCK(ipxp); 478 error = ipx_pcbbind(ipxp, nam, td); 479 IPX_UNLOCK(ipxp); 480 IPX_LIST_UNLOCK(); 481 return (error); 482 } 483 484 static int 485 ipx_connect(so, nam, td) 486 struct socket *so; 487 struct sockaddr *nam; 488 struct thread *td; 489 { 490 struct ipxpcb *ipxp = sotoipxpcb(so); 491 int error; 492 493 IPX_LIST_LOCK(); 494 IPX_LOCK(ipxp); 495 if (!ipx_nullhost(ipxp->ipxp_faddr)) { 496 error = EISCONN; 497 goto out; 498 } 499 error = ipx_pcbconnect(ipxp, nam, td); 500 if (error == 0) 501 soisconnected(so); 502 out: 503 IPX_UNLOCK(ipxp); 504 IPX_LIST_UNLOCK(); 505 return (error); 506 } 507 508 static int 509 ipx_detach(so) 510 struct socket *so; 511 { 512 struct ipxpcb *ipxp = sotoipxpcb(so); 513 514 if (ipxp == NULL) 515 return (ENOTCONN); 516 IPX_LIST_LOCK(); 517 IPX_LOCK(ipxp); 518 ipx_pcbdetach(ipxp); 519 IPX_LIST_UNLOCK(); 520 return (0); 521 } 522 523 static int 524 ipx_disconnect(so) 525 struct socket *so; 526 { 527 struct ipxpcb *ipxp = sotoipxpcb(so); 528 int error; 529 530 IPX_LIST_LOCK(); 531 IPX_LOCK(ipxp); 532 error = 0; 533 if (ipx_nullhost(ipxp->ipxp_faddr)) { 534 error = ENOTCONN; 535 goto out; 536 } 537 ipx_pcbdisconnect(ipxp); 538 soisdisconnected(so); 539 out: 540 IPX_UNLOCK(ipxp); 541 IPX_LIST_UNLOCK(); 542 return (0); 543 } 544 545 int 546 ipx_peeraddr(so, nam) 547 struct socket *so; 548 struct sockaddr **nam; 549 { 550 struct ipxpcb *ipxp = sotoipxpcb(so); 551 552 ipx_setpeeraddr(ipxp, nam); 553 return (0); 554 } 555 556 static int 557 ipx_send(so, flags, m, nam, control, td) 558 struct socket *so; 559 int flags; 560 struct mbuf *m; 561 struct sockaddr *nam; 562 struct mbuf *control; 563 struct thread *td; 564 { 565 int error; 566 struct ipxpcb *ipxp = sotoipxpcb(so); 567 struct ipx_addr laddr; 568 569 /* 570 * Attempt to only acquire the necessary locks: if the socket is 571 * already connected, we don't need to hold the IPX list lock to be 572 * used by ipx_pcbconnect() and ipx_pcbdisconnect(), just the IPX 573 * pcb lock. 574 */ 575 if (nam != NULL) { 576 IPX_LIST_LOCK(); 577 IPX_LOCK(ipxp); 578 laddr = ipxp->ipxp_laddr; 579 if (!ipx_nullhost(ipxp->ipxp_faddr)) { 580 IPX_UNLOCK(ipxp); 581 IPX_LIST_UNLOCK(); 582 error = EISCONN; 583 goto send_release; 584 } 585 /* 586 * Must block input while temporarily connected. 587 */ 588 error = ipx_pcbconnect(ipxp, nam, td); 589 if (error) { 590 IPX_UNLOCK(ipxp); 591 IPX_LIST_UNLOCK(); 592 goto send_release; 593 } 594 } else { 595 IPX_LOCK(ipxp); 596 if (ipx_nullhost(ipxp->ipxp_faddr)) { 597 IPX_UNLOCK(ipxp); 598 error = ENOTCONN; 599 goto send_release; 600 } 601 } 602 error = ipx_output(ipxp, m); 603 m = NULL; 604 if (nam != NULL) { 605 ipx_pcbdisconnect(ipxp); 606 ipxp->ipxp_laddr = laddr; 607 IPX_UNLOCK(ipxp); 608 IPX_LIST_UNLOCK(); 609 } else 610 IPX_UNLOCK(ipxp); 611 612 send_release: 613 if (m != NULL) 614 m_freem(m); 615 return (error); 616 } 617 618 static int 619 ipx_shutdown(so) 620 struct socket *so; 621 { 622 socantsendmore(so); 623 return (0); 624 } 625 626 int 627 ipx_sockaddr(so, nam) 628 struct socket *so; 629 struct sockaddr **nam; 630 { 631 struct ipxpcb *ipxp = sotoipxpcb(so); 632 633 ipx_setsockaddr(ipxp, nam); 634 return (0); 635 } 636 637 static int 638 ripx_attach(so, proto, td) 639 struct socket *so; 640 int proto; 641 struct thread *td; 642 { 643 int error = 0; 644 struct ipxpcb *ipxp = sotoipxpcb(so); 645 646 if (td != NULL && (error = suser(td)) != 0) 647 return (error); 648 /* 649 * We hold the IPX list lock for the duration as address parameters 650 * of the IPX pcb are changed. Since no one else holds a reference 651 * to the ipxpcb yet, we don't need the ipxpcb lock here. 652 */ 653 IPX_LIST_LOCK(); 654 error = ipx_pcballoc(so, &ipxrawpcb_list, td); 655 if (error) 656 goto out; 657 ipxp = sotoipxpcb(so); 658 error = soreserve(so, ipxsendspace, ipxrecvspace); 659 if (error) 660 goto out; 661 ipxp->ipxp_faddr.x_host = ipx_broadhost; 662 ipxp->ipxp_flags = IPXP_RAWIN | IPXP_RAWOUT; 663 out: 664 IPX_LIST_UNLOCK(); 665 return (error); 666 }
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