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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 * $FreeBSD$ 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 struct ng_apply_info apply; 212 213 #ifdef NOTYET 214 if (control && (error = ng_internalize(control, td))) { 215 if (pcbp->sockdata == NULL) { 216 error = ENOTCONN; 217 goto release; 218 } 219 } 220 #else /* NOTYET */ 221 if (control) { 222 error = EINVAL; 223 goto release; 224 } 225 #endif /* NOTYET */ 226 227 /* Require destination as there may be >= 1 hooks on this node */ 228 if (addr == NULL) { 229 error = EDESTADDRREQ; 230 goto release; 231 } 232 233 /* Allocate an expendable buffer for the path, chop off 234 * the sockaddr header, and make sure it's NUL terminated */ 235 len = sap->sg_len - 2; 236 MALLOC(path, char *, len + 1, M_NETGRAPH_PATH, M_WAITOK); 237 if (path == NULL) { 238 error = ENOMEM; 239 goto release; 240 } 241 bcopy(sap->sg_data, path, len); 242 path[len] = '\0'; 243 244 /* Move the actual message out of mbufs into a linear buffer. 245 * Start by adding up the size of the data. (could use mh_len?) */ 246 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next) 247 len += m0->m_len; 248 249 /* Move the data into a linear buffer as well. Messages are not 250 * delivered in mbufs. */ 251 MALLOC(msg, struct ng_mesg *, len + 1, M_NETGRAPH_MSG, M_WAITOK); 252 if (msg == NULL) { 253 error = ENOMEM; 254 goto release; 255 } 256 m_copydata(m, 0, len, (char *)msg); 257 258 if (msg->header.version != NG_VERSION) { 259 FREE(msg, M_NETGRAPH_MSG); 260 error = EINVAL; 261 goto release; 262 } 263 264 /* 265 * Hack alert! 266 * We look into the message and if it mkpeers a node of unknown type, we 267 * try to load it. We need to do this now, in syscall thread, because if 268 * message gets queued and applied later we will get panic. 269 */ 270 if (msg->header.typecookie == NGM_GENERIC_COOKIE && 271 msg->header.cmd == NGM_MKPEER) { 272 struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data; 273 struct ng_type *type; 274 275 if ((type = ng_findtype(mkp->type)) == NULL) { 276 char filename[NG_TYPESIZ + 3]; 277 linker_file_t lf; 278 279 /* Not found, try to load it as a loadable module. */ 280 snprintf(filename, sizeof(filename), "ng_%s", 281 mkp->type); 282 mtx_lock(&Giant); 283 error = linker_load_module(NULL, filename, NULL, NULL, 284 &lf); 285 mtx_unlock(&Giant); 286 if (error != 0) { 287 FREE(msg, M_NETGRAPH_MSG); 288 goto release; 289 } 290 lf->userrefs++; 291 292 /* See if type has been loaded successfully. */ 293 if ((type = ng_findtype(mkp->type)) == NULL) { 294 FREE(msg, M_NETGRAPH_MSG); 295 error = ENXIO; 296 goto release; 297 } 298 } 299 } 300 301 if ((item = ng_package_msg(msg, M_WAITOK)) == NULL) { 302 error = ENOMEM; 303 #ifdef TRACE_MESSAGES 304 printf("ng_package_msg: err=%d\n", error); 305 #endif 306 goto release; 307 } 308 if ((error = ng_address_path((pcbp->sockdata->node), item, 309 path, 0)) != 0) { 310 #ifdef TRACE_MESSAGES 311 printf("ng_address_path: errx=%d\n", error); 312 #endif 313 goto release; 314 } 315 316 #ifdef TRACE_MESSAGES 317 printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n", 318 item->el_dest->nd_ID, 319 msg->header.typecookie, 320 msg->header.cmd, 321 msg->header.cmdstr, 322 msg->header.flags, 323 msg->header.token, 324 item->el_dest->nd_type->name); 325 #endif 326 SAVE_LINE(item); 327 /* 328 * We do not want to return from syscall until the item 329 * is processed by destination node. We register callback 330 * on the item, which will update priv->error when item 331 * was applied. 332 * If ng_snd_item() has queued item, we sleep until 333 * callback wakes us up. 334 */ 335 bzero(&apply, sizeof(apply)); 336 apply.apply = ng_socket_item_applied; 337 apply.context = priv; 338 item->apply = &apply; 339 priv->error = -1; 340 341 error = ng_snd_item(item, 0); 342 343 mtx_lock(&priv->mtx); 344 if (priv->error == -1) 345 msleep(priv, &priv->mtx, 0, "ngsock", 0); 346 mtx_unlock(&priv->mtx); 347 KASSERT(priv->error != -1, 348 ("ng_socket: priv->error wasn't updated")); 349 error = priv->error; 350 351 release: 352 if (path != NULL) 353 FREE(path, M_NETGRAPH_PATH); 354 if (control != NULL) 355 m_freem(control); 356 if (m != NULL) 357 m_freem(m); 358 return (error); 359 } 360 361 static int 362 ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 363 { 364 struct ngpcb *const pcbp = sotongpcb(so); 365 366 if (pcbp == 0) 367 return (EINVAL); 368 return (ng_bind(nam, pcbp)); 369 } 370 371 static int 372 ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 373 { 374 printf(" program tried to connect control socket to remote node\n "); 375 /* 376 * At this time refuse to do this.. it used to 377 * do something but it was undocumented and not used. 378 */ 379 return (EINVAL); 380 } 381 382 /*************************************************************** 383 Data sockets 384 ***************************************************************/ 385 386 static int 387 ngd_attach(struct socket *so, int proto, struct thread *td) 388 { 389 struct ngpcb *const pcbp = sotongpcb(so); 390 391 if (pcbp != NULL) 392 return (EISCONN); 393 return (ng_attach_data(so)); 394 } 395 396 static int 397 ngd_detach(struct socket *so) 398 { 399 struct ngpcb *const pcbp = sotongpcb(so); 400 401 if (pcbp == NULL) 402 return (EINVAL); 403 ng_detach_common(pcbp, NG_DATA); 404 return (0); 405 } 406 407 static int 408 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 409 struct mbuf *control, struct thread *td) 410 { 411 struct ngpcb *const pcbp = sotongpcb(so); 412 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 413 int len, error; 414 hook_p hook = NULL; 415 char hookname[NG_HOOKSIZ]; 416 417 if ((pcbp == NULL) || (control != NULL)) { 418 error = EINVAL; 419 goto release; 420 } 421 if (pcbp->sockdata == NULL) { 422 error = ENOTCONN; 423 goto release; 424 } 425 426 if (sap == NULL) 427 len = 0; /* Make compiler happy. */ 428 else 429 len = sap->sg_len - 2; 430 431 /* 432 * If the user used any of these ways to not specify an address 433 * then handle specially. 434 */ 435 if ((sap == NULL) || (len <= 0) || (*sap->sg_data == '\0')) { 436 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) { 437 error = EDESTADDRREQ; 438 goto release; 439 } 440 /* 441 * if exactly one hook exists, just use it. 442 * Special case to allow write(2) to work on an ng_socket. 443 */ 444 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks); 445 } else { 446 if (len >= NG_HOOKSIZ) { 447 error = EINVAL; 448 goto release; 449 } 450 451 /* 452 * chop off the sockaddr header, and make sure it's NUL 453 * terminated 454 */ 455 bcopy(sap->sg_data, hookname, len); 456 hookname[len] = '\0'; 457 458 /* Find the correct hook from 'hookname' */ 459 LIST_FOREACH(hook, &pcbp->sockdata->node->nd_hooks, hk_hooks) { 460 if (strcmp(hookname, NG_HOOK_NAME(hook)) == 0) { 461 break; 462 } 463 } 464 if (hook == NULL) { 465 error = EHOSTUNREACH; 466 } 467 } 468 469 /* Send data (OK if hook is NULL) */ 470 NG_SEND_DATA_ONLY(error, hook, m); /* makes m NULL */ 471 472 release: 473 if (control != NULL) 474 m_freem(control); 475 if (m != NULL) 476 m_freem(m); 477 return (error); 478 } 479 480 static int 481 ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 482 { 483 struct ngpcb *const pcbp = sotongpcb(so); 484 485 if (pcbp == 0) 486 return (EINVAL); 487 return (ng_connect_data(nam, pcbp)); 488 } 489 490 /* 491 * Used for both data and control sockets 492 */ 493 static int 494 ng_setsockaddr(struct socket *so, struct sockaddr **addr) 495 { 496 struct ngpcb *pcbp; 497 struct sockaddr_ng *sg; 498 int sg_len; 499 int error = 0; 500 501 /* Why isn't sg_data a `char[1]' ? :-( */ 502 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1; 503 504 pcbp = sotongpcb(so); 505 if ((pcbp == NULL) || (pcbp->sockdata == NULL)) 506 /* XXXGL: can this still happen? */ 507 return (EINVAL); 508 509 mtx_lock(&pcbp->sockdata->mtx); 510 if (pcbp->sockdata->node != NULL) { 511 node_p node = pcbp->sockdata->node; 512 int namelen = 0; /* silence compiler! */ 513 514 if (NG_NODE_HAS_NAME(node)) 515 sg_len += namelen = strlen(NG_NODE_NAME(node)); 516 517 sg = malloc(sg_len, M_SONAME, M_WAITOK | M_ZERO); 518 519 if (NG_NODE_HAS_NAME(node)) 520 bcopy(NG_NODE_NAME(node), sg->sg_data, namelen); 521 522 sg->sg_len = sg_len; 523 sg->sg_family = AF_NETGRAPH; 524 *addr = (struct sockaddr *)sg; 525 mtx_unlock(&pcbp->sockdata->mtx); 526 } else { 527 mtx_unlock(&pcbp->sockdata->mtx); 528 error = EINVAL; 529 } 530 531 return (error); 532 } 533 534 /* 535 * Attach a socket to it's protocol specific partner. 536 * For a control socket, actually create a netgraph node and attach 537 * to it as well. 538 */ 539 540 static int 541 ng_attach_cntl(struct socket *so) 542 { 543 struct ngsock *priv; 544 struct ngpcb *pcbp; 545 int error; 546 547 /* Allocate node private info */ 548 MALLOC(priv, struct ngsock *, 549 sizeof(*priv), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO); 550 if (priv == NULL) 551 return (ENOMEM); 552 553 /* Setup protocol control block */ 554 if ((error = ng_attach_common(so, NG_CONTROL)) != 0) { 555 FREE(priv, M_NETGRAPH_SOCK); 556 return (error); 557 } 558 pcbp = sotongpcb(so); 559 560 /* Link the pcb the private data. */ 561 priv->ctlsock = pcbp; 562 pcbp->sockdata = priv; 563 priv->refs++; 564 565 /* Initialize mutex. */ 566 mtx_init(&priv->mtx, "ng_socket", NULL, MTX_DEF); 567 568 /* Make the generic node components */ 569 if ((error = ng_make_node_common(&typestruct, &priv->node)) != 0) { 570 FREE(priv, M_NETGRAPH_SOCK); 571 ng_detach_common(pcbp, NG_CONTROL); 572 return (error); 573 } 574 575 /* Link the node and the private data. */ 576 NG_NODE_SET_PRIVATE(priv->node, priv); 577 NG_NODE_REF(priv->node); 578 priv->refs++; 579 580 return (0); 581 } 582 583 static int 584 ng_attach_data(struct socket *so) 585 { 586 return(ng_attach_common(so, NG_DATA)); 587 } 588 589 /* 590 * Set up a socket protocol control block. 591 * This code is shared between control and data sockets. 592 */ 593 static int 594 ng_attach_common(struct socket *so, int type) 595 { 596 struct ngpcb *pcbp; 597 int error; 598 599 /* Standard socket setup stuff */ 600 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace); 601 if (error) 602 return (error); 603 604 /* Allocate the pcb */ 605 MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO); 606 if (pcbp == NULL) 607 return (ENOMEM); 608 pcbp->type = type; 609 610 /* Link the pcb and the socket */ 611 so->so_pcb = (caddr_t) pcbp; 612 pcbp->ng_socket = so; 613 614 /* Add the socket to linked list */ 615 mtx_lock(&ngsocketlist_mtx); 616 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks); 617 mtx_unlock(&ngsocketlist_mtx); 618 return (0); 619 } 620 621 /* 622 * Disassociate the socket from it's protocol specific 623 * partner. If it's attached to a node's private data structure, 624 * then unlink from that too. If we were the last socket attached to it, 625 * then shut down the entire node. Shared code for control and data sockets. 626 */ 627 static void 628 ng_detach_common(struct ngpcb *pcbp, int which) 629 { 630 struct ngsock *priv = pcbp->sockdata; 631 632 if (priv != NULL) { 633 mtx_lock(&priv->mtx); 634 635 switch (which) { 636 case NG_CONTROL: 637 priv->ctlsock = NULL; 638 break; 639 case NG_DATA: 640 priv->datasock = NULL; 641 break; 642 default: 643 panic(__func__); 644 } 645 pcbp->sockdata = NULL; 646 647 ng_socket_free_priv(priv); 648 } 649 650 pcbp->ng_socket->so_pcb = NULL; 651 mtx_lock(&ngsocketlist_mtx); 652 LIST_REMOVE(pcbp, socks); 653 mtx_unlock(&ngsocketlist_mtx); 654 FREE(pcbp, M_PCB); 655 } 656 657 /* 658 * Remove a reference from node private data. 659 */ 660 static void 661 ng_socket_free_priv(struct ngsock *priv) 662 { 663 mtx_assert(&priv->mtx, MA_OWNED); 664 665 priv->refs--; 666 667 if (priv->refs == 0) { 668 mtx_destroy(&priv->mtx); 669 FREE(priv, M_NETGRAPH_SOCK); 670 return; 671 } 672 673 if ((priv->refs == 1) && (priv->node != NULL)) { 674 node_p node = priv->node; 675 676 priv->node = NULL; 677 mtx_unlock(&priv->mtx); 678 NG_NODE_UNREF(node); 679 ng_rmnode_self(node); 680 } else 681 mtx_unlock(&priv->mtx); 682 } 683 684 #ifdef NOTYET 685 /* 686 * File descriptors can be passed into an AF_NETGRAPH socket. 687 * Note, that file descriptors cannot be passed OUT. 688 * Only character device descriptors are accepted. 689 * Character devices are useful to connect a graph to a device, 690 * which after all is the purpose of this whole system. 691 */ 692 static int 693 ng_internalize(struct mbuf *control, struct thread *td) 694 { 695 const struct cmsghdr *cm = mtod(control, const struct cmsghdr *); 696 struct file *fp; 697 struct vnode *vn; 698 int oldfds; 699 int fd; 700 701 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || 702 cm->cmsg_len != control->m_len) { 703 TRAP_ERROR; 704 return (EINVAL); 705 } 706 707 /* Check there is only one FD. XXX what would more than one signify? */ 708 oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int); 709 if (oldfds != 1) { 710 TRAP_ERROR; 711 return (EINVAL); 712 } 713 714 /* Check that the FD given is legit. and change it to a pointer to a 715 * struct file. */ 716 fd = CMSG_DATA(cm); 717 if ((error = fget(td, fd, &fp)) != 0) 718 return (error); 719 720 /* Depending on what kind of resource it is, act differently. For 721 * devices, we treat it as a file. For an AF_NETGRAPH socket, 722 * shortcut straight to the node. */ 723 switch (fp->f_type) { 724 case DTYPE_VNODE: 725 vn = fp->f_data; 726 if (vn && (vn->v_type == VCHR)) { 727 /* for a VCHR, actually reference the FILE */ 728 fp->f_count++; 729 /* XXX then what :) */ 730 /* how to pass on to other modules? */ 731 } else { 732 fdrop(fp, td); 733 TRAP_ERROR; 734 return (EINVAL); 735 } 736 break; 737 default: 738 fdrop(fp, td); 739 TRAP_ERROR; 740 return (EINVAL); 741 } 742 fdrop(fp, td); 743 return (0); 744 } 745 #endif /* NOTYET */ 746 747 /* 748 * Connect the data socket to a named control socket node. 749 */ 750 static int 751 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp) 752 { 753 struct sockaddr_ng *sap; 754 node_p farnode; 755 struct ngsock *priv; 756 int error; 757 item_p item; 758 759 /* If we are already connected, don't do it again */ 760 if (pcbp->sockdata != NULL) 761 return (EISCONN); 762 763 /* Find the target (victim) and check it doesn't already have a data 764 * socket. Also check it is a 'socket' type node. 765 * Use ng_package_data() and address_path() to do this. 766 */ 767 768 sap = (struct sockaddr_ng *) nam; 769 /* The item will hold the node reference */ 770 item = ng_package_data(NULL, NG_WAITOK); 771 if (item == NULL) { 772 return (ENOMEM); 773 } 774 if ((error = ng_address_path(NULL, item, sap->sg_data, 0))) 775 return (error); /* item is freed on failure */ 776 777 /* 778 * Extract node from item and free item. Remember we now have 779 * a reference on the node. The item holds it for us. 780 * when we free the item we release the reference. 781 */ 782 farnode = item->el_dest; /* shortcut */ 783 if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) { 784 NG_FREE_ITEM(item); /* drop the reference to the node */ 785 return (EINVAL); 786 } 787 priv = NG_NODE_PRIVATE(farnode); 788 if (priv->datasock != NULL) { 789 NG_FREE_ITEM(item); /* drop the reference to the node */ 790 return (EADDRINUSE); 791 } 792 793 /* 794 * Link the PCB and the private data struct. and note the extra 795 * reference. Drop the extra reference on the node. 796 */ 797 mtx_lock(&priv->mtx); 798 priv->datasock = pcbp; 799 pcbp->sockdata = priv; 800 priv->refs++; 801 mtx_unlock(&priv->mtx); 802 NG_FREE_ITEM(item); /* drop the reference to the node */ 803 return (0); 804 } 805 806 /* 807 * Binding a socket means giving the corresponding node a name 808 */ 809 static int 810 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp) 811 { 812 struct ngsock *const priv = pcbp->sockdata; 813 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam; 814 815 if (priv == NULL) { 816 TRAP_ERROR; 817 return (EINVAL); 818 } 819 if ((sap->sg_len < 4) 820 || (sap->sg_len > (NG_NODESIZ + 2)) 821 || (sap->sg_data[0] == '\0') 822 || (sap->sg_data[sap->sg_len - 3] != '\0')) { 823 TRAP_ERROR; 824 return (EINVAL); 825 } 826 return (ng_name_node(priv->node, sap->sg_data)); 827 } 828 829 /* 830 * Take a message and pass it up to the control socket associated 831 * with the node. 832 */ 833 static int 834 ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr) 835 { 836 struct socket *const so = pcbp->ng_socket; 837 struct mbuf *mdata; 838 int msglen; 839 int error = 0; 840 841 /* Copy the message itself into an mbuf chain */ 842 msglen = sizeof(struct ng_mesg) + msg->header.arglen; 843 mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL); 844 845 /* Here we free the message, as we are the end of the line. 846 * We need to do that regardless of whether we got mbufs. */ 847 NG_FREE_MSG(msg); 848 849 if (mdata == NULL) { 850 TRAP_ERROR; 851 return (ENOBUFS); 852 } 853 854 /* Send it up to the socket */ 855 if (sbappendaddr(&so->so_rcv, 856 (struct sockaddr *) addr, mdata, NULL) == 0) { 857 TRAP_ERROR; 858 m_freem(mdata); 859 return (ENOBUFS); 860 } 861 sorwakeup(so); 862 return (error); 863 } 864 865 /*************************************************************** 866 Netgraph node 867 ***************************************************************/ 868 869 /* 870 * You can only create new nodes from the socket end of things. 871 */ 872 static int 873 ngs_constructor(node_p nodep) 874 { 875 return (EINVAL); 876 } 877 878 /* 879 * We allow any hook to be connected to the node. 880 * There is no per-hook private information though. 881 */ 882 static int 883 ngs_newhook(node_p node, hook_p hook, const char *name) 884 { 885 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node)); 886 return (0); 887 } 888 889 /* 890 * if only one hook, allow read(2) and write(2) to work. 891 */ 892 static int 893 ngs_connect(hook_p hook) 894 { 895 node_p node = NG_HOOK_NODE(hook); 896 struct ngsock *priv = NG_NODE_PRIVATE(node); 897 898 if ((priv->datasock) 899 && (priv->datasock->ng_socket)) { 900 if (NG_NODE_NUMHOOKS(node) == 1) { 901 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED; 902 } else { 903 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED; 904 } 905 } 906 return (0); 907 } 908 909 /* 910 * Incoming messages get passed up to the control socket. 911 * Unless they are for us specifically (socket_type) 912 */ 913 static int 914 ngs_rcvmsg(node_p node, item_p item, hook_p lasthook) 915 { 916 struct ngsock *const priv = NG_NODE_PRIVATE(node); 917 struct ngpcb *const pcbp = priv->ctlsock; 918 struct sockaddr_ng *addr; 919 int addrlen; 920 int error = 0; 921 struct ng_mesg *msg; 922 ng_ID_t retaddr = NGI_RETADDR(item); 923 char retabuf[32]; 924 925 NGI_GET_MSG(item, msg); 926 NG_FREE_ITEM(item); /* we have all we need */ 927 928 /* Only allow mesgs to be passed if we have the control socket. 929 * Data sockets can only support the generic messages. */ 930 if (pcbp == NULL) { 931 TRAP_ERROR; 932 return (EINVAL); 933 } 934 935 #ifdef TRACE_MESSAGES 936 printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n", 937 retaddr, 938 msg->header.typecookie, 939 msg->header.cmd, 940 msg->header.cmdstr, 941 msg->header.flags, 942 msg->header.token); 943 #endif 944 945 if (msg->header.typecookie == NGM_SOCKET_COOKIE) { 946 switch (msg->header.cmd) { 947 case NGM_SOCK_CMD_NOLINGER: 948 priv->flags |= NGS_FLAG_NOLINGER; 949 break; 950 case NGM_SOCK_CMD_LINGER: 951 priv->flags &= ~NGS_FLAG_NOLINGER; 952 break; 953 default: 954 error = EINVAL; /* unknown command */ 955 } 956 /* Free the message and return */ 957 NG_FREE_MSG(msg); 958 return(error); 959 960 } 961 /* Get the return address into a sockaddr */ 962 sprintf(retabuf,"[%x]:", retaddr); 963 addrlen = strlen(retabuf); 964 MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH_PATH, M_NOWAIT); 965 if (addr == NULL) { 966 TRAP_ERROR; 967 return (ENOMEM); 968 } 969 addr->sg_len = addrlen + 3; 970 addr->sg_family = AF_NETGRAPH; 971 bcopy(retabuf, addr->sg_data, addrlen); 972 addr->sg_data[addrlen] = '\0'; 973 974 /* Send it up */ 975 error = ship_msg(pcbp, msg, addr); 976 FREE(addr, M_NETGRAPH_PATH); 977 return (error); 978 } 979 980 /* 981 * Receive data on a hook 982 */ 983 static int 984 ngs_rcvdata(hook_p hook, item_p item) 985 { 986 struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 987 struct ngpcb *const pcbp = priv->datasock; 988 struct socket *so; 989 struct sockaddr_ng *addr; 990 char *addrbuf[NG_HOOKSIZ + 4]; 991 int addrlen; 992 struct mbuf *m; 993 994 NGI_GET_M(item, m); 995 NG_FREE_ITEM(item); 996 /* If there is no data socket, black-hole it */ 997 if (pcbp == NULL) { 998 NG_FREE_M(m); 999 return (0); 1000 } 1001 so = pcbp->ng_socket; 1002 1003 /* Get the return address into a sockaddr. */ 1004 addrlen = strlen(NG_HOOK_NAME(hook)); /* <= NG_HOOKSIZ - 1 */ 1005 addr = (struct sockaddr_ng *) addrbuf; 1006 addr->sg_len = addrlen + 3; 1007 addr->sg_family = AF_NETGRAPH; 1008 bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen); 1009 addr->sg_data[addrlen] = '\0'; 1010 1011 /* Try to tell the socket which hook it came in on */ 1012 if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) { 1013 m_freem(m); 1014 TRAP_ERROR; 1015 return (ENOBUFS); 1016 } 1017 sorwakeup(so); 1018 return (0); 1019 } 1020 1021 /* 1022 * Hook disconnection 1023 * 1024 * For this type, removal of the last link destroys the node 1025 * if the NOLINGER flag is set. 1026 */ 1027 static int 1028 ngs_disconnect(hook_p hook) 1029 { 1030 node_p node = NG_HOOK_NODE(hook); 1031 struct ngsock *const priv = NG_NODE_PRIVATE(node); 1032 1033 if ((priv->datasock) 1034 && (priv->datasock->ng_socket)) { 1035 if (NG_NODE_NUMHOOKS(node) == 1) { 1036 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED; 1037 } else { 1038 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED; 1039 } 1040 } 1041 1042 if ((priv->flags & NGS_FLAG_NOLINGER ) 1043 && (NG_NODE_NUMHOOKS(node) == 0) 1044 && (NG_NODE_IS_VALID(node))) { 1045 ng_rmnode_self(node); 1046 } 1047 return (0); 1048 } 1049 1050 /* 1051 * Do local shutdown processing. 1052 * In this case, that involves making sure the socket 1053 * knows we should be shutting down. 1054 */ 1055 static int 1056 ngs_shutdown(node_p node) 1057 { 1058 struct ngsock *const priv = NG_NODE_PRIVATE(node); 1059 struct ngpcb *const dpcbp = priv->datasock; 1060 struct ngpcb *const pcbp = priv->ctlsock; 1061 1062 if (dpcbp != NULL) 1063 soisdisconnected(dpcbp->ng_socket); 1064 1065 if (pcbp != NULL) 1066 soisdisconnected(pcbp->ng_socket); 1067 1068 mtx_lock(&priv->mtx); 1069 priv->node = NULL; 1070 NG_NODE_SET_PRIVATE(node, NULL); 1071 ng_socket_free_priv(priv); 1072 1073 NG_NODE_UNREF(node); 1074 return (0); 1075 } 1076 1077 static void 1078 ng_socket_item_applied(void *context, int error) 1079 { 1080 struct ngsock *const priv = (struct ngsock *)context; 1081 1082 mtx_lock(&priv->mtx); 1083 priv->error = error; 1084 wakeup(priv); 1085 mtx_unlock(&priv->mtx); 1086 1087 } 1088 1089 static int 1090 dummy_disconnect(struct socket *so) 1091 { 1092 return (0); 1093 } 1094 /* 1095 * Control and data socket type descriptors 1096 */ 1097 1098 static struct pr_usrreqs ngc_usrreqs = { 1099 .pru_abort = NULL, 1100 .pru_attach = ngc_attach, 1101 .pru_bind = ngc_bind, 1102 .pru_connect = ngc_connect, 1103 .pru_detach = ngc_detach, 1104 .pru_disconnect = dummy_disconnect, 1105 .pru_peeraddr = NULL, 1106 .pru_send = ngc_send, 1107 .pru_shutdown = NULL, 1108 .pru_sockaddr = ng_setsockaddr, 1109 }; 1110 1111 static struct pr_usrreqs ngd_usrreqs = { 1112 .pru_abort = NULL, 1113 .pru_attach = ngd_attach, 1114 .pru_bind = NULL, 1115 .pru_connect = ngd_connect, 1116 .pru_detach = ngd_detach, 1117 .pru_disconnect = dummy_disconnect, 1118 .pru_peeraddr = NULL, 1119 .pru_send = ngd_send, 1120 .pru_shutdown = NULL, 1121 .pru_sockaddr = ng_setsockaddr, 1122 }; 1123 1124 /* 1125 * Definitions of protocols supported in the NETGRAPH domain. 1126 */ 1127 1128 extern struct domain ngdomain; /* stop compiler warnings */ 1129 1130 static struct protosw ngsw[] = { 1131 { 1132 .pr_type = SOCK_DGRAM, 1133 .pr_domain = &ngdomain, 1134 .pr_protocol = NG_CONTROL, 1135 .pr_flags = PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, 1136 .pr_usrreqs = &ngc_usrreqs 1137 }, 1138 { 1139 .pr_type = SOCK_DGRAM, 1140 .pr_domain = &ngdomain, 1141 .pr_protocol = NG_DATA, 1142 .pr_flags = PR_ATOMIC | PR_ADDR, 1143 .pr_usrreqs = &ngd_usrreqs 1144 } 1145 }; 1146 1147 struct domain ngdomain = { 1148 .dom_family = AF_NETGRAPH, 1149 .dom_name = "netgraph", 1150 .dom_protosw = ngsw, 1151 .dom_protoswNPROTOSW = &ngsw[sizeof(ngsw) / sizeof(ngsw[0])] 1152 }; 1153 1154 /* 1155 * Handle loading and unloading for this node type 1156 * This is to handle auxiliary linkages (e.g protocol domain addition). 1157 */ 1158 static int 1159 ngs_mod_event(module_t mod, int event, void *data) 1160 { 1161 int error = 0; 1162 1163 switch (event) { 1164 case MOD_LOAD: 1165 mtx_init(&ngsocketlist_mtx, "ng_socketlist", NULL, MTX_DEF); 1166 /* Register protocol domain */ 1167 net_add_domain(&ngdomain); 1168 break; 1169 case MOD_UNLOAD: 1170 /* Insure there are no open netgraph sockets */ 1171 if (!LIST_EMPTY(&ngsocklist)) { 1172 error = EBUSY; 1173 break; 1174 } 1175 1176 #ifdef NOTYET 1177 if ((LIST_EMPTY(&ngsocklist)) && (typestruct.refs == 0)) { 1178 /* Unregister protocol domain XXX can't do this yet.. */ 1179 if ((error = net_rm_domain(&ngdomain)) != 0) 1180 break; 1181 mtx_destroy(&ngsocketlist_mtx); 1182 } else 1183 #endif 1184 error = EBUSY; 1185 break; 1186 default: 1187 error = EOPNOTSUPP; 1188 break; 1189 } 1190 return (error); 1191 } 1192 1193 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, ""); 1194 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA"); 1195 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, ""); 1196 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL"); 1197 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, ""); 1198
Cache object: 5982a676dbcd10dda4262a50262c4068
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