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sys/netgraph/ng_socket.c
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1 /* 2 * ng_socket.c 3 */ 4 5 /*- 6 * Copyright (c) 1996-1999 Whistle Communications, Inc. 7 * All rights reserved. 8 * 9 * Subject to the following obligations and disclaimer of warranty, use and 10 * redistribution of this software, in source or object code forms, with or 11 * without modifications are expressly permitted by Whistle Communications; 12 * provided, however, that: 13 * 1. Any and all reproductions of the source or object code must include the 14 * copyright notice above and the following disclaimer of warranties; and 15 * 2. No rights are granted, in any manner or form, to use Whistle 16 * Communications, Inc. trademarks, including the mark "WHISTLE 17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 18 * such appears in the above copyright notice or in the software. 19 * 20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 36 * OF SUCH DAMAGE. 37 * 38 * Author: Julian Elischer <julian@freebsd.org> 39 * 40 * $FreeBSD: releng/6.1/sys/netgraph/ng_socket.c 152791 2005-11-25 14:26:40Z glebius $ 41 * $Whistle: ng_socket.c,v 1.28 1999/11/01 09:24:52 julian Exp $ 42 */ 43 44 /* 45 * Netgraph socket nodes 46 * 47 * There are two types of netgraph sockets, control and data. 48 * Control sockets have a netgraph node, but data sockets are 49 * parasitic on control sockets, and have no node of their own. 50 */ 51 52 #include <sys/param.h> 53 #include <sys/domain.h> 54 #include <sys/errno.h> 55 #include <sys/kdb.h> 56 #include <sys/kernel.h> 57 #include <sys/linker.h> 58 #include <sys/lock.h> 59 #include <sys/malloc.h> 60 #include <sys/mbuf.h> 61 #include <sys/mutex.h> 62 #include <sys/protosw.h> 63 #include <sys/queue.h> 64 #include <sys/signalvar.h> 65 #include <sys/socket.h> 66 #include <sys/socketvar.h> 67 #include <sys/sx.h> 68 #include <sys/sysctl.h> 69 #include <sys/systm.h> 70 #ifdef NOTYET 71 #include <sys/vnode.h> 72 #endif 73 #include <netgraph/ng_message.h> 74 #include <netgraph/netgraph.h> 75 #include <netgraph/ng_socketvar.h> 76 #include <netgraph/ng_socket.h> 77 78 #ifdef NG_SEPARATE_MALLOC 79 MALLOC_DEFINE(M_NETGRAPH_PATH, "netgraph_path", "netgraph path info "); 80 MALLOC_DEFINE(M_NETGRAPH_SOCK, "netgraph_sock", "netgraph socket info "); 81 #else 82 #define M_NETGRAPH_PATH M_NETGRAPH 83 #define M_NETGRAPH_SOCK M_NETGRAPH 84 #endif 85 86 /* 87 * It's Ascii-art time! 88 * +-------------+ +-------------+ 89 * |socket (ctl)| |socket (data)| 90 * +-------------+ +-------------+ 91 * ^ ^ 92 * | | 93 * v v 94 * +-----------+ +-----------+ 95 * |pcb (ctl)| |pcb (data)| 96 * +-----------+ +-----------+ 97 * ^ ^ 98 * | | 99 * v v 100 * +--------------------------+ 101 * | Socket type private | 102 * | data | 103 * +--------------------------+ 104 * ^ 105 * | 106 * v 107 * +----------------+ 108 * | struct ng_node | 109 * +----------------+ 110 */ 111 112 /* Netgraph node methods */ 113 static ng_constructor_t ngs_constructor; 114 static ng_rcvmsg_t ngs_rcvmsg; 115 static ng_shutdown_t ngs_shutdown; 116 static ng_newhook_t ngs_newhook; 117 static ng_connect_t ngs_connect; 118 static ng_rcvdata_t ngs_rcvdata; 119 static ng_disconnect_t ngs_disconnect; 120 121 /* Internal methods */ 122 static int ng_attach_data(struct socket *so); 123 static int ng_attach_cntl(struct socket *so); 124 static int ng_attach_common(struct socket *so, int type); 125 static void ng_detach_common(struct ngpcb *pcbp, int type); 126 static void ng_socket_free_priv(struct ngsock *priv); 127 /*static int ng_internalize(struct mbuf *m, struct thread *p); */ 128 129 static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp); 130 static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp); 131 132 static int ngs_mod_event(module_t mod, int event, void *data); 133 static int ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, 134 struct sockaddr_ng *addr); 135 static void ng_socket_item_applied(void *context, int error); 136 137 /* Netgraph type descriptor */ 138 static struct ng_type typestruct = { 139 .version = NG_ABI_VERSION, 140 .name = NG_SOCKET_NODE_TYPE, 141 .mod_event = ngs_mod_event, 142 .constructor = ngs_constructor, 143 .rcvmsg = ngs_rcvmsg, 144 .shutdown = ngs_shutdown, 145 .newhook = ngs_newhook, 146 .connect = ngs_connect, 147 .rcvdata = ngs_rcvdata, 148 .disconnect = ngs_disconnect, 149 }; 150 NETGRAPH_INIT_ORDERED(socket, &typestruct, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 151 152 /* Buffer space */ 153 static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */ 154 SYSCTL_INT(_net_graph, OID_AUTO, maxdgram, CTLFLAG_RW, 155 &ngpdg_sendspace , 0, "Maximum outgoing Netgraph datagram size"); 156 static u_long ngpdg_recvspace = 20 * 1024; 157 SYSCTL_INT(_net_graph, OID_AUTO, recvspace, CTLFLAG_RW, 158 &ngpdg_recvspace , 0, "Maximum space for incoming Netgraph datagrams"); 159 160 /* List of all sockets */ 161 static LIST_HEAD(, ngpcb) ngsocklist; 162 163 static struct mtx ngsocketlist_mtx; 164 165 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb) 166 167 /* If getting unexplained errors returned, set this to "kdb_enter("X"); */ 168 #ifndef TRAP_ERROR 169 #define TRAP_ERROR 170 #endif 171 172 /*************************************************************** 173 Control sockets 174 ***************************************************************/ 175 176 static int 177 ngc_attach(struct socket *so, int proto, struct thread *td) 178 { 179 struct ngpcb *const pcbp = sotongpcb(so); 180 181 if (suser(td)) 182 return (EPERM); 183 if (pcbp != NULL) 184 return (EISCONN); 185 return (ng_attach_cntl(so)); 186 } 187 188 static int 189 ngc_detach(struct socket *so) 190 { 191 struct ngpcb *const pcbp = sotongpcb(so); 192 193 if (pcbp == NULL) 194 return (EINVAL); 195 ng_detach_common(pcbp, NG_CONTROL); 196 return (0); 197 } 198 199 static int 200 ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 201 struct mbuf *control, struct thread *td) 202 { 203 struct ngpcb *const pcbp = sotongpcb(so); 204 struct ngsock *const priv = NG_NODE_PRIVATE(pcbp->sockdata->node); 205 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 206 struct ng_mesg *msg; 207 struct mbuf *m0; 208 item_p item; 209 char *path = NULL; 210 int len, error = 0; 211 212 if (pcbp == NULL) { 213 error = EINVAL; 214 goto release; 215 } 216 #ifdef NOTYET 217 if (control && (error = ng_internalize(control, td))) { 218 if (pcbp->sockdata == NULL) { 219 error = ENOTCONN; 220 goto release; 221 } 222 } 223 #else /* NOTYET */ 224 if (control) { 225 error = EINVAL; 226 goto release; 227 } 228 #endif /* NOTYET */ 229 230 /* Require destination as there may be >= 1 hooks on this node */ 231 if (addr == NULL) { 232 error = EDESTADDRREQ; 233 goto release; 234 } 235 236 /* Allocate an expendable buffer for the path, chop off 237 * the sockaddr header, and make sure it's NUL terminated */ 238 len = sap->sg_len - 2; 239 MALLOC(path, char *, len + 1, M_NETGRAPH_PATH, M_WAITOK); 240 if (path == NULL) { 241 error = ENOMEM; 242 goto release; 243 } 244 bcopy(sap->sg_data, path, len); 245 path[len] = '\0'; 246 247 /* Move the actual message out of mbufs into a linear buffer. 248 * Start by adding up the size of the data. (could use mh_len?) */ 249 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next) 250 len += m0->m_len; 251 252 /* Move the data into a linear buffer as well. Messages are not 253 * delivered in mbufs. */ 254 MALLOC(msg, struct ng_mesg *, len + 1, M_NETGRAPH_MSG, M_WAITOK); 255 if (msg == NULL) { 256 error = ENOMEM; 257 goto release; 258 } 259 m_copydata(m, 0, len, (char *)msg); 260 261 if (msg->header.version != NG_VERSION) { 262 error = EINVAL; 263 goto release; 264 } 265 266 /* 267 * Hack alert! 268 * We look into the message and if it mkpeers a node of unknown type, we 269 * try to load it. We need to do this now, in syscall thread, because if 270 * message gets queued and applied later we will get panic. 271 */ 272 if (msg->header.typecookie == NGM_GENERIC_COOKIE && 273 msg->header.cmd == NGM_MKPEER) { 274 struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data; 275 struct ng_type *type; 276 277 if ((type = ng_findtype(mkp->type)) == NULL) { 278 char filename[NG_TYPESIZ + 3]; 279 linker_file_t lf; 280 281 /* Not found, try to load it as a loadable module. */ 282 snprintf(filename, sizeof(filename), "ng_%s", 283 mkp->type); 284 mtx_lock(&Giant); 285 error = linker_load_module(NULL, filename, NULL, NULL, 286 &lf); 287 mtx_unlock(&Giant); 288 if (error != 0) { 289 FREE(msg, M_NETGRAPH_MSG); 290 goto release; 291 } 292 lf->userrefs++; 293 294 /* See if type has been loaded successfully. */ 295 if ((type = ng_findtype(mkp->type)) == NULL) { 296 FREE(msg, M_NETGRAPH_MSG); 297 error = ENXIO; 298 goto release; 299 } 300 } 301 } 302 303 if ((item = ng_package_msg(msg, M_WAITOK)) == NULL) { 304 error = ENOMEM; 305 #ifdef TRACE_MESSAGES 306 printf("ng_package_msg: err=%d\n", error); 307 #endif 308 goto release; 309 } 310 if ((error = ng_address_path((pcbp->sockdata->node), item, 311 path, 0)) != 0) { 312 #ifdef TRACE_MESSAGES 313 printf("ng_address_path: errx=%d\n", error); 314 #endif 315 goto release; 316 } 317 318 #ifdef TRACE_MESSAGES 319 printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n", 320 item->el_dest->nd_ID, 321 msg->header.typecookie, 322 msg->header.cmd, 323 msg->header.cmdstr, 324 msg->header.flags, 325 msg->header.token, 326 item->el_dest->nd_type->name); 327 #endif 328 SAVE_LINE(item); 329 /* 330 * We do not want to return from syscall until the item 331 * is processed by destination node. We register callback 332 * on the item, which will update priv->error when item 333 * was applied. 334 * If ng_snd_item() has queued item, we sleep until 335 * callback wakes us up. 336 */ 337 item->apply = ng_socket_item_applied; 338 item->context = priv; 339 priv->error = -1; 340 341 error = ng_snd_item(item, NG_PROGRESS); 342 343 if (error == EINPROGRESS) { 344 mtx_lock(&priv->mtx); 345 if (priv->error == -1) 346 msleep(priv, &priv->mtx, 0, "ngsock", 0); 347 mtx_unlock(&priv->mtx); 348 KASSERT(priv->error != -1, 349 ("ng_socket: priv->error wasn't updated")); 350 error = priv->error; 351 } 352 353 release: 354 if (path != NULL) 355 FREE(path, M_NETGRAPH_PATH); 356 if (control != NULL) 357 m_freem(control); 358 if (m != NULL) 359 m_freem(m); 360 return (error); 361 } 362 363 static int 364 ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 365 { 366 struct ngpcb *const pcbp = sotongpcb(so); 367 368 if (pcbp == 0) 369 return (EINVAL); 370 return (ng_bind(nam, pcbp)); 371 } 372 373 static int 374 ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 375 { 376 printf(" program tried to connect control socket to remote node\n "); 377 /* 378 * At this time refuse to do this.. it used to 379 * do something but it was undocumented and not used. 380 */ 381 return (EINVAL); 382 } 383 384 /*************************************************************** 385 Data sockets 386 ***************************************************************/ 387 388 static int 389 ngd_attach(struct socket *so, int proto, struct thread *td) 390 { 391 struct ngpcb *const pcbp = sotongpcb(so); 392 393 if (pcbp != NULL) 394 return (EISCONN); 395 return (ng_attach_data(so)); 396 } 397 398 static int 399 ngd_detach(struct socket *so) 400 { 401 struct ngpcb *const pcbp = sotongpcb(so); 402 403 if (pcbp == NULL) 404 return (EINVAL); 405 ng_detach_common(pcbp, NG_DATA); 406 return (0); 407 } 408 409 static int 410 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 411 struct mbuf *control, struct thread *td) 412 { 413 struct ngpcb *const pcbp = sotongpcb(so); 414 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 415 int len, error; 416 hook_p hook = NULL; 417 char hookname[NG_HOOKSIZ]; 418 419 if ((pcbp == NULL) || (control != NULL)) { 420 error = EINVAL; 421 goto release; 422 } 423 if (pcbp->sockdata == NULL) { 424 error = ENOTCONN; 425 goto release; 426 } 427 428 if (sap == NULL) 429 len = 0; /* Make compiler happy. */ 430 else 431 len = sap->sg_len - 2; 432 433 /* 434 * If the user used any of these ways to not specify an address 435 * then handle specially. 436 */ 437 if ((sap == NULL) || (len <= 0) || (*sap->sg_data == '\0')) { 438 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) { 439 error = EDESTADDRREQ; 440 goto release; 441 } 442 /* 443 * if exactly one hook exists, just use it. 444 * Special case to allow write(2) to work on an ng_socket. 445 */ 446 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks); 447 } else { 448 if (len >= NG_HOOKSIZ) { 449 error = EINVAL; 450 goto release; 451 } 452 453 /* 454 * chop off the sockaddr header, and make sure it's NUL 455 * terminated 456 */ 457 bcopy(sap->sg_data, hookname, len); 458 hookname[len] = '\0'; 459 460 /* Find the correct hook from 'hookname' */ 461 LIST_FOREACH(hook, &pcbp->sockdata->node->nd_hooks, hk_hooks) { 462 if (strcmp(hookname, NG_HOOK_NAME(hook)) == 0) { 463 break; 464 } 465 } 466 if (hook == NULL) { 467 error = EHOSTUNREACH; 468 } 469 } 470 471 /* Send data (OK if hook is NULL) */ 472 NG_SEND_DATA_ONLY(error, hook, m); /* makes m NULL */ 473 474 release: 475 if (control != NULL) 476 m_freem(control); 477 if (m != NULL) 478 m_freem(m); 479 return (error); 480 } 481 482 static int 483 ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 484 { 485 struct ngpcb *const pcbp = sotongpcb(so); 486 487 if (pcbp == 0) 488 return (EINVAL); 489 return (ng_connect_data(nam, pcbp)); 490 } 491 492 /* 493 * Used for both data and control sockets 494 */ 495 static int 496 ng_setsockaddr(struct socket *so, struct sockaddr **addr) 497 { 498 struct ngpcb *pcbp; 499 struct sockaddr_ng *sg; 500 int sg_len; 501 int error = 0; 502 503 /* Why isn't sg_data a `char[1]' ? :-( */ 504 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1; 505 506 pcbp = sotongpcb(so); 507 if ((pcbp == NULL) || (pcbp->sockdata == NULL)) 508 /* XXXGL: can this still happen? */ 509 return (EINVAL); 510 511 mtx_lock(&pcbp->sockdata->mtx); 512 if (pcbp->sockdata->node != NULL) { 513 node_p node = pcbp->sockdata->node; 514 int namelen = 0; /* silence compiler! */ 515 516 if (NG_NODE_HAS_NAME(node)) 517 sg_len += namelen = strlen(NG_NODE_NAME(node)); 518 519 sg = malloc(sg_len, M_SONAME, M_WAITOK | M_ZERO); 520 521 if (NG_NODE_HAS_NAME(node)) 522 bcopy(NG_NODE_NAME(node), sg->sg_data, namelen); 523 524 sg->sg_len = sg_len; 525 sg->sg_family = AF_NETGRAPH; 526 *addr = (struct sockaddr *)sg; 527 mtx_unlock(&pcbp->sockdata->mtx); 528 } else { 529 mtx_unlock(&pcbp->sockdata->mtx); 530 error = EINVAL; 531 } 532 533 return (error); 534 } 535 536 /* 537 * Attach a socket to it's protocol specific partner. 538 * For a control socket, actually create a netgraph node and attach 539 * to it as well. 540 */ 541 542 static int 543 ng_attach_cntl(struct socket *so) 544 { 545 struct ngsock *priv; 546 struct ngpcb *pcbp; 547 int error; 548 549 /* Allocate node private info */ 550 MALLOC(priv, struct ngsock *, 551 sizeof(*priv), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO); 552 if (priv == NULL) 553 return (ENOMEM); 554 555 /* Setup protocol control block */ 556 if ((error = ng_attach_common(so, NG_CONTROL)) != 0) { 557 FREE(priv, M_NETGRAPH_SOCK); 558 return (error); 559 } 560 pcbp = sotongpcb(so); 561 562 /* Link the pcb the private data. */ 563 priv->ctlsock = pcbp; 564 pcbp->sockdata = priv; 565 priv->refs++; 566 567 /* Initialize mutex. */ 568 mtx_init(&priv->mtx, "ng_socket", NULL, MTX_DEF); 569 570 /* Make the generic node components */ 571 if ((error = ng_make_node_common(&typestruct, &priv->node)) != 0) { 572 FREE(priv, M_NETGRAPH_SOCK); 573 ng_detach_common(pcbp, NG_CONTROL); 574 return (error); 575 } 576 577 /* Link the node and the private data. */ 578 NG_NODE_SET_PRIVATE(priv->node, priv); 579 NG_NODE_REF(priv->node); 580 priv->refs++; 581 582 return (0); 583 } 584 585 static int 586 ng_attach_data(struct socket *so) 587 { 588 return(ng_attach_common(so, NG_DATA)); 589 } 590 591 /* 592 * Set up a socket protocol control block. 593 * This code is shared between control and data sockets. 594 */ 595 static int 596 ng_attach_common(struct socket *so, int type) 597 { 598 struct ngpcb *pcbp; 599 int error; 600 601 /* Standard socket setup stuff */ 602 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace); 603 if (error) 604 return (error); 605 606 /* Allocate the pcb */ 607 MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO); 608 if (pcbp == NULL) 609 return (ENOMEM); 610 pcbp->type = type; 611 612 /* Link the pcb and the socket */ 613 so->so_pcb = (caddr_t) pcbp; 614 pcbp->ng_socket = so; 615 616 /* Add the socket to linked list */ 617 mtx_lock(&ngsocketlist_mtx); 618 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks); 619 mtx_unlock(&ngsocketlist_mtx); 620 return (0); 621 } 622 623 /* 624 * Disassociate the socket from it's protocol specific 625 * partner. If it's attached to a node's private data structure, 626 * then unlink from that too. If we were the last socket attached to it, 627 * then shut down the entire node. Shared code for control and data sockets. 628 */ 629 static void 630 ng_detach_common(struct ngpcb *pcbp, int which) 631 { 632 struct ngsock *priv = pcbp->sockdata; 633 634 if (priv != NULL) { 635 mtx_lock(&priv->mtx); 636 637 switch (which) { 638 case NG_CONTROL: 639 priv->ctlsock = NULL; 640 break; 641 case NG_DATA: 642 priv->datasock = NULL; 643 break; 644 default: 645 panic(__func__); 646 } 647 pcbp->sockdata = NULL; 648 649 ng_socket_free_priv(priv); 650 } 651 652 pcbp->ng_socket->so_pcb = NULL; 653 mtx_lock(&ngsocketlist_mtx); 654 LIST_REMOVE(pcbp, socks); 655 mtx_unlock(&ngsocketlist_mtx); 656 FREE(pcbp, M_PCB); 657 } 658 659 /* 660 * Remove a reference from node private data. 661 */ 662 static void 663 ng_socket_free_priv(struct ngsock *priv) 664 { 665 mtx_assert(&priv->mtx, MA_OWNED); 666 667 priv->refs--; 668 669 if (priv->refs == 0) { 670 mtx_destroy(&priv->mtx); 671 FREE(priv, M_NETGRAPH_SOCK); 672 return; 673 } 674 675 if ((priv->refs == 1) && (priv->node != NULL)) { 676 node_p node = priv->node; 677 678 priv->node = NULL; 679 mtx_unlock(&priv->mtx); 680 NG_NODE_UNREF(node); 681 ng_rmnode_self(node); 682 } else 683 mtx_unlock(&priv->mtx); 684 } 685 686 #ifdef NOTYET 687 /* 688 * File descriptors can be passed into an AF_NETGRAPH socket. 689 * Note, that file descriptors cannot be passed OUT. 690 * Only character device descriptors are accepted. 691 * Character devices are useful to connect a graph to a device, 692 * which after all is the purpose of this whole system. 693 */ 694 static int 695 ng_internalize(struct mbuf *control, struct thread *td) 696 { 697 const struct cmsghdr *cm = mtod(control, const struct cmsghdr *); 698 struct file *fp; 699 struct vnode *vn; 700 int oldfds; 701 int fd; 702 703 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || 704 cm->cmsg_len != control->m_len) { 705 TRAP_ERROR; 706 return (EINVAL); 707 } 708 709 /* Check there is only one FD. XXX what would more than one signify? */ 710 oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int); 711 if (oldfds != 1) { 712 TRAP_ERROR; 713 return (EINVAL); 714 } 715 716 /* Check that the FD given is legit. and change it to a pointer to a 717 * struct file. */ 718 fd = CMSG_DATA(cm); 719 if ((error = fget(td, fd, &fp)) != 0) 720 return (error); 721 722 /* Depending on what kind of resource it is, act differently. For 723 * devices, we treat it as a file. For an AF_NETGRAPH socket, 724 * shortcut straight to the node. */ 725 switch (fp->f_type) { 726 case DTYPE_VNODE: 727 vn = fp->f_data; 728 if (vn && (vn->v_type == VCHR)) { 729 /* for a VCHR, actually reference the FILE */ 730 fp->f_count++; 731 /* XXX then what :) */ 732 /* how to pass on to other modules? */ 733 } else { 734 fdrop(fp, td); 735 TRAP_ERROR; 736 return (EINVAL); 737 } 738 break; 739 default: 740 fdrop(fp, td); 741 TRAP_ERROR; 742 return (EINVAL); 743 } 744 fdrop(fp, td); 745 return (0); 746 } 747 #endif /* NOTYET */ 748 749 /* 750 * Connect the data socket to a named control socket node. 751 */ 752 static int 753 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp) 754 { 755 struct sockaddr_ng *sap; 756 node_p farnode; 757 struct ngsock *priv; 758 int error; 759 item_p item; 760 761 /* If we are already connected, don't do it again */ 762 if (pcbp->sockdata != NULL) 763 return (EISCONN); 764 765 /* Find the target (victim) and check it doesn't already have a data 766 * socket. Also check it is a 'socket' type node. 767 * Use ng_package_data() and address_path() to do this. 768 */ 769 770 sap = (struct sockaddr_ng *) nam; 771 /* The item will hold the node reference */ 772 item = ng_package_data(NULL, NG_WAITOK); 773 if (item == NULL) { 774 return (ENOMEM); 775 } 776 if ((error = ng_address_path(NULL, item, sap->sg_data, 0))) 777 return (error); /* item is freed on failure */ 778 779 /* 780 * Extract node from item and free item. Remember we now have 781 * a reference on the node. The item holds it for us. 782 * when we free the item we release the reference. 783 */ 784 farnode = item->el_dest; /* shortcut */ 785 if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) { 786 NG_FREE_ITEM(item); /* drop the reference to the node */ 787 return (EINVAL); 788 } 789 priv = NG_NODE_PRIVATE(farnode); 790 if (priv->datasock != NULL) { 791 NG_FREE_ITEM(item); /* drop the reference to the node */ 792 return (EADDRINUSE); 793 } 794 795 /* 796 * Link the PCB and the private data struct. and note the extra 797 * reference. Drop the extra reference on the node. 798 */ 799 mtx_lock(&priv->mtx); 800 priv->datasock = pcbp; 801 pcbp->sockdata = priv; 802 priv->refs++; 803 mtx_unlock(&priv->mtx); 804 NG_FREE_ITEM(item); /* drop the reference to the node */ 805 return (0); 806 } 807 808 /* 809 * Binding a socket means giving the corresponding node a name 810 */ 811 static int 812 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp) 813 { 814 struct ngsock *const priv = pcbp->sockdata; 815 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam; 816 817 if (priv == NULL) { 818 TRAP_ERROR; 819 return (EINVAL); 820 } 821 if ((sap->sg_len < 4) 822 || (sap->sg_len > (NG_NODESIZ + 2)) 823 || (sap->sg_data[0] == '\0') 824 || (sap->sg_data[sap->sg_len - 3] != '\0')) { 825 TRAP_ERROR; 826 return (EINVAL); 827 } 828 return (ng_name_node(priv->node, sap->sg_data)); 829 } 830 831 /* 832 * Take a message and pass it up to the control socket associated 833 * with the node. 834 */ 835 static int 836 ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr) 837 { 838 struct socket *const so = pcbp->ng_socket; 839 struct mbuf *mdata; 840 int msglen; 841 int error = 0; 842 843 /* Copy the message itself into an mbuf chain */ 844 msglen = sizeof(struct ng_mesg) + msg->header.arglen; 845 mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL); 846 847 /* Here we free the message, as we are the end of the line. 848 * We need to do that regardless of whether we got mbufs. */ 849 NG_FREE_MSG(msg); 850 851 if (mdata == NULL) { 852 TRAP_ERROR; 853 return (ENOBUFS); 854 } 855 856 /* Send it up to the socket */ 857 if (sbappendaddr(&so->so_rcv, 858 (struct sockaddr *) addr, mdata, NULL) == 0) { 859 TRAP_ERROR; 860 m_freem(mdata); 861 error = so->so_error = ENOBUFS; 862 } 863 sorwakeup(so); 864 return (error); 865 } 866 867 /*************************************************************** 868 Netgraph node 869 ***************************************************************/ 870 871 /* 872 * You can only create new nodes from the socket end of things. 873 */ 874 static int 875 ngs_constructor(node_p nodep) 876 { 877 return (EINVAL); 878 } 879 880 /* 881 * We allow any hook to be connected to the node. 882 * There is no per-hook private information though. 883 */ 884 static int 885 ngs_newhook(node_p node, hook_p hook, const char *name) 886 { 887 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node)); 888 return (0); 889 } 890 891 /* 892 * if only one hook, allow read(2) and write(2) to work. 893 */ 894 static int 895 ngs_connect(hook_p hook) 896 { 897 node_p node = NG_HOOK_NODE(hook); 898 struct ngsock *priv = NG_NODE_PRIVATE(node); 899 900 if ((priv->datasock) 901 && (priv->datasock->ng_socket)) { 902 if (NG_NODE_NUMHOOKS(node) == 1) { 903 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED; 904 } else { 905 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED; 906 } 907 } 908 return (0); 909 } 910 911 /* 912 * Incoming messages get passed up to the control socket. 913 * Unless they are for us specifically (socket_type) 914 */ 915 static int 916 ngs_rcvmsg(node_p node, item_p item, hook_p lasthook) 917 { 918 struct ngsock *const priv = NG_NODE_PRIVATE(node); 919 struct ngpcb *const pcbp = priv->ctlsock; 920 struct sockaddr_ng *addr; 921 int addrlen; 922 int error = 0; 923 struct ng_mesg *msg; 924 ng_ID_t retaddr = NGI_RETADDR(item); 925 char retabuf[32]; 926 927 NGI_GET_MSG(item, msg); 928 NG_FREE_ITEM(item); /* we have all we need */ 929 930 /* Only allow mesgs to be passed if we have the control socket. 931 * Data sockets can only support the generic messages. */ 932 if (pcbp == NULL) { 933 TRAP_ERROR; 934 return (EINVAL); 935 } 936 937 #ifdef TRACE_MESSAGES 938 printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n", 939 retaddr, 940 msg->header.typecookie, 941 msg->header.cmd, 942 msg->header.cmdstr, 943 msg->header.flags, 944 msg->header.token); 945 #endif 946 947 if (msg->header.typecookie == NGM_SOCKET_COOKIE) { 948 switch (msg->header.cmd) { 949 case NGM_SOCK_CMD_NOLINGER: 950 priv->flags |= NGS_FLAG_NOLINGER; 951 break; 952 case NGM_SOCK_CMD_LINGER: 953 priv->flags &= ~NGS_FLAG_NOLINGER; 954 break; 955 default: 956 error = EINVAL; /* unknown command */ 957 } 958 /* Free the message and return */ 959 NG_FREE_MSG(msg); 960 return(error); 961 962 } 963 /* Get the return address into a sockaddr */ 964 sprintf(retabuf,"[%x]:", retaddr); 965 addrlen = strlen(retabuf); 966 MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH_PATH, M_NOWAIT); 967 if (addr == NULL) { 968 TRAP_ERROR; 969 return (ENOMEM); 970 } 971 addr->sg_len = addrlen + 3; 972 addr->sg_family = AF_NETGRAPH; 973 bcopy(retabuf, addr->sg_data, addrlen); 974 addr->sg_data[addrlen] = '\0'; 975 976 /* Send it up */ 977 error = ship_msg(pcbp, msg, addr); 978 FREE(addr, M_NETGRAPH_PATH); 979 return (error); 980 } 981 982 /* 983 * Receive data on a hook 984 */ 985 static int 986 ngs_rcvdata(hook_p hook, item_p item) 987 { 988 struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 989 struct ngpcb *const pcbp = priv->datasock; 990 struct socket *so; 991 struct sockaddr_ng *addr; 992 char *addrbuf[NG_HOOKSIZ + 4]; 993 int addrlen; 994 struct mbuf *m; 995 996 NGI_GET_M(item, m); 997 NG_FREE_ITEM(item); 998 /* If there is no data socket, black-hole it */ 999 if (pcbp == NULL) { 1000 NG_FREE_M(m); 1001 return (0); 1002 } 1003 so = pcbp->ng_socket; 1004 1005 /* Get the return address into a sockaddr. */ 1006 addrlen = strlen(NG_HOOK_NAME(hook)); /* <= NG_HOOKSIZ - 1 */ 1007 addr = (struct sockaddr_ng *) addrbuf; 1008 addr->sg_len = addrlen + 3; 1009 addr->sg_family = AF_NETGRAPH; 1010 bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen); 1011 addr->sg_data[addrlen] = '\0'; 1012 1013 /* Try to tell the socket which hook it came in on */ 1014 if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) { 1015 m_freem(m); 1016 TRAP_ERROR; 1017 return (ENOBUFS); 1018 } 1019 sorwakeup(so); 1020 return (0); 1021 } 1022 1023 /* 1024 * Hook disconnection 1025 * 1026 * For this type, removal of the last link destroys the node 1027 * if the NOLINGER flag is set. 1028 */ 1029 static int 1030 ngs_disconnect(hook_p hook) 1031 { 1032 node_p node = NG_HOOK_NODE(hook); 1033 struct ngsock *const priv = NG_NODE_PRIVATE(node); 1034 1035 if ((priv->datasock) 1036 && (priv->datasock->ng_socket)) { 1037 if (NG_NODE_NUMHOOKS(node) == 1) { 1038 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED; 1039 } else { 1040 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED; 1041 } 1042 } 1043 1044 if ((priv->flags & NGS_FLAG_NOLINGER ) 1045 && (NG_NODE_NUMHOOKS(node) == 0) 1046 && (NG_NODE_IS_VALID(node))) { 1047 ng_rmnode_self(node); 1048 } 1049 return (0); 1050 } 1051 1052 /* 1053 * Do local shutdown processing. 1054 * In this case, that involves making sure the socket 1055 * knows we should be shutting down. 1056 */ 1057 static int 1058 ngs_shutdown(node_p node) 1059 { 1060 struct ngsock *const priv = NG_NODE_PRIVATE(node); 1061 struct ngpcb *const dpcbp = priv->datasock; 1062 struct ngpcb *const pcbp = priv->ctlsock; 1063 1064 if (dpcbp != NULL) 1065 soisdisconnected(dpcbp->ng_socket); 1066 1067 if (pcbp != NULL) 1068 soisdisconnected(pcbp->ng_socket); 1069 1070 mtx_lock(&priv->mtx); 1071 priv->node = NULL; 1072 NG_NODE_SET_PRIVATE(node, NULL); 1073 ng_socket_free_priv(priv); 1074 1075 NG_NODE_UNREF(node); 1076 return (0); 1077 } 1078 1079 static void 1080 ng_socket_item_applied(void *context, int error) 1081 { 1082 struct ngsock *const priv = (struct ngsock *)context; 1083 1084 mtx_lock(&priv->mtx); 1085 priv->error = error; 1086 wakeup(priv); 1087 mtx_unlock(&priv->mtx); 1088 1089 } 1090 1091 static int 1092 dummy_disconnect(struct socket *so) 1093 { 1094 return (0); 1095 } 1096 /* 1097 * Control and data socket type descriptors 1098 */ 1099 1100 static struct pr_usrreqs ngc_usrreqs = { 1101 .pru_abort = NULL, 1102 .pru_attach = ngc_attach, 1103 .pru_bind = ngc_bind, 1104 .pru_connect = ngc_connect, 1105 .pru_detach = ngc_detach, 1106 .pru_disconnect = dummy_disconnect, 1107 .pru_peeraddr = NULL, 1108 .pru_send = ngc_send, 1109 .pru_shutdown = NULL, 1110 .pru_sockaddr = ng_setsockaddr, 1111 }; 1112 1113 static struct pr_usrreqs ngd_usrreqs = { 1114 .pru_abort = NULL, 1115 .pru_attach = ngd_attach, 1116 .pru_bind = NULL, 1117 .pru_connect = ngd_connect, 1118 .pru_detach = ngd_detach, 1119 .pru_disconnect = dummy_disconnect, 1120 .pru_peeraddr = NULL, 1121 .pru_send = ngd_send, 1122 .pru_shutdown = NULL, 1123 .pru_sockaddr = ng_setsockaddr, 1124 }; 1125 1126 /* 1127 * Definitions of protocols supported in the NETGRAPH domain. 1128 */ 1129 1130 extern struct domain ngdomain; /* stop compiler warnings */ 1131 1132 static struct protosw ngsw[] = { 1133 { 1134 .pr_type = SOCK_DGRAM, 1135 .pr_domain = &ngdomain, 1136 .pr_protocol = NG_CONTROL, 1137 .pr_flags = PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, 1138 .pr_usrreqs = &ngc_usrreqs 1139 }, 1140 { 1141 .pr_type = SOCK_DGRAM, 1142 .pr_domain = &ngdomain, 1143 .pr_protocol = NG_DATA, 1144 .pr_flags = PR_ATOMIC | PR_ADDR, 1145 .pr_usrreqs = &ngd_usrreqs 1146 } 1147 }; 1148 1149 struct domain ngdomain = { 1150 .dom_family = AF_NETGRAPH, 1151 .dom_name = "netgraph", 1152 .dom_protosw = ngsw, 1153 .dom_protoswNPROTOSW = &ngsw[sizeof(ngsw) / sizeof(ngsw[0])] 1154 }; 1155 1156 /* 1157 * Handle loading and unloading for this node type 1158 * This is to handle auxiliary linkages (e.g protocol domain addition). 1159 */ 1160 static int 1161 ngs_mod_event(module_t mod, int event, void *data) 1162 { 1163 int error = 0; 1164 1165 switch (event) { 1166 case MOD_LOAD: 1167 mtx_init(&ngsocketlist_mtx, "ng_socketlist", NULL, MTX_DEF); 1168 /* Register protocol domain */ 1169 net_add_domain(&ngdomain); 1170 break; 1171 case MOD_UNLOAD: 1172 /* Insure there are no open netgraph sockets */ 1173 if (!LIST_EMPTY(&ngsocklist)) { 1174 error = EBUSY; 1175 break; 1176 } 1177 1178 #ifdef NOTYET 1179 if ((LIST_EMPTY(&ngsocklist)) && (typestruct.refs == 0)) { 1180 /* Unregister protocol domain XXX can't do this yet.. */ 1181 if ((error = net_rm_domain(&ngdomain)) != 0) 1182 break; 1183 mtx_destroy(&ngsocketlist_mtx); 1184 } else 1185 #endif 1186 error = EBUSY; 1187 break; 1188 default: 1189 error = EOPNOTSUPP; 1190 break; 1191 } 1192 return (error); 1193 } 1194 1195 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, ""); 1196 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA"); 1197 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, ""); 1198 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL"); 1199 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, ""); 1200
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