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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/8.1/sys/netgraph/ng_socket.c 208690 2010-06-01 09:32:22Z attilio $ 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/kernel.h> 55 #include <sys/linker.h> 56 #include <sys/lock.h> 57 #include <sys/malloc.h> 58 #include <sys/mbuf.h> 59 #include <sys/mutex.h> 60 #include <sys/priv.h> 61 #include <sys/protosw.h> 62 #include <sys/queue.h> 63 #include <sys/socket.h> 64 #include <sys/socketvar.h> 65 #include <sys/syscallsubr.h> 66 #include <sys/sysctl.h> 67 #ifdef NOTYET 68 #include <sys/vnode.h> 69 #endif 70 71 #include <net/vnet.h> 72 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 #ifdef NOTYET 128 static int ng_internalize(struct mbuf *m, struct thread *p); 129 #endif 130 static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp); 131 static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp); 132 133 static int ngs_mod_event(module_t mod, int event, void *data); 134 static void ng_socket_item_applied(void *context, int error); 135 136 /* Netgraph type descriptor */ 137 static struct ng_type typestruct = { 138 .version = NG_ABI_VERSION, 139 .name = NG_SOCKET_NODE_TYPE, 140 .mod_event = ngs_mod_event, 141 .constructor = ngs_constructor, 142 .rcvmsg = ngs_rcvmsg, 143 .shutdown = ngs_shutdown, 144 .newhook = ngs_newhook, 145 .connect = ngs_connect, 146 .rcvdata = ngs_rcvdata, 147 .disconnect = ngs_disconnect, 148 }; 149 NETGRAPH_INIT_ORDERED(socket, &typestruct, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 150 151 /* Buffer space */ 152 static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */ 153 SYSCTL_INT(_net_graph, OID_AUTO, maxdgram, CTLFLAG_RW, 154 &ngpdg_sendspace , 0, "Maximum outgoing Netgraph datagram size"); 155 static u_long ngpdg_recvspace = 20 * 1024; 156 SYSCTL_INT(_net_graph, OID_AUTO, recvspace, CTLFLAG_RW, 157 &ngpdg_recvspace , 0, "Maximum space for incoming Netgraph datagrams"); 158 159 /* List of all sockets (for netstat -f netgraph) */ 160 static LIST_HEAD(, ngpcb) ngsocklist; 161 162 static struct mtx ngsocketlist_mtx; 163 164 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb) 165 166 /* If getting unexplained errors returned, set this to "kdb_enter("X"); */ 167 #ifndef TRAP_ERROR 168 #define TRAP_ERROR 169 #endif 170 171 /*************************************************************** 172 Control sockets 173 ***************************************************************/ 174 175 static int 176 ngc_attach(struct socket *so, int proto, struct thread *td) 177 { 178 struct ngpcb *const pcbp = sotongpcb(so); 179 int error; 180 181 error = priv_check(td, PRIV_NETGRAPH_CONTROL); 182 if (error) 183 return (error); 184 if (pcbp != NULL) 185 return (EISCONN); 186 return (ng_attach_cntl(so)); 187 } 188 189 static void 190 ngc_detach(struct socket *so) 191 { 192 struct ngpcb *const pcbp = sotongpcb(so); 193 194 KASSERT(pcbp != NULL, ("ngc_detach: pcbp == NULL")); 195 ng_detach_common(pcbp, NG_CONTROL); 196 } 197 198 static int 199 ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 200 struct mbuf *control, struct thread *td) 201 { 202 struct ngpcb *const pcbp = sotongpcb(so); 203 struct ngsock *const priv = NG_NODE_PRIVATE(pcbp->sockdata->node); 204 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 205 struct ng_mesg *msg; 206 struct mbuf *m0; 207 item_p item; 208 char *path = NULL; 209 int len, error = 0; 210 struct ng_apply_info apply; 211 212 #ifdef NOTYET 213 if (control && (error = ng_internalize(control, td))) { 214 if (pcbp->sockdata == NULL) { 215 error = ENOTCONN; 216 goto release; 217 } 218 } 219 #else /* NOTYET */ 220 if (control) { 221 error = EINVAL; 222 goto release; 223 } 224 #endif /* NOTYET */ 225 226 /* Require destination as there may be >= 1 hooks on this node. */ 227 if (addr == NULL) { 228 error = EDESTADDRREQ; 229 goto release; 230 } 231 232 /* 233 * Allocate an expendable buffer for the path, chop off 234 * the sockaddr header, and make sure it's NUL terminated. 235 */ 236 len = sap->sg_len - 2; 237 path = malloc(len + 1, M_NETGRAPH_PATH, M_WAITOK); 238 bcopy(sap->sg_data, path, len); 239 path[len] = '\0'; 240 241 /* 242 * Move the actual message out of mbufs into a linear buffer. 243 * Start by adding up the size of the data. (could use mh_len?) 244 */ 245 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next) 246 len += m0->m_len; 247 248 /* 249 * Move the data into a linear buffer as well. 250 * Messages are not delivered in mbufs. 251 */ 252 msg = malloc(len + 1, M_NETGRAPH_MSG, M_WAITOK); 253 m_copydata(m, 0, len, (char *)msg); 254 255 if (msg->header.version != NG_VERSION) { 256 free(msg, M_NETGRAPH_MSG); 257 error = EINVAL; 258 goto release; 259 } 260 261 /* 262 * Hack alert! 263 * We look into the message and if it mkpeers a node of unknown type, we 264 * try to load it. We need to do this now, in syscall thread, because if 265 * message gets queued and applied later we will get panic. 266 */ 267 if (msg->header.typecookie == NGM_GENERIC_COOKIE && 268 msg->header.cmd == NGM_MKPEER) { 269 struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data; 270 271 if (ng_findtype(mkp->type) == NULL) { 272 char filename[NG_TYPESIZ + 3]; 273 int fileid; 274 275 /* Not found, try to load it as a loadable module. */ 276 snprintf(filename, sizeof(filename), "ng_%s", 277 mkp->type); 278 error = kern_kldload(curthread, filename, &fileid); 279 if (error != 0) { 280 free(msg, M_NETGRAPH_MSG); 281 goto release; 282 } 283 284 /* See if type has been loaded successfully. */ 285 if (ng_findtype(mkp->type) == NULL) { 286 free(msg, M_NETGRAPH_MSG); 287 (void)kern_kldunload(curthread, fileid, 288 LINKER_UNLOAD_NORMAL); 289 error = ENXIO; 290 goto release; 291 } 292 } 293 } 294 295 item = ng_package_msg(msg, M_WAITOK); 296 if ((error = ng_address_path((pcbp->sockdata->node), item, path, 0)) 297 != 0) { 298 #ifdef TRACE_MESSAGES 299 printf("ng_address_path: errx=%d\n", error); 300 #endif 301 goto release; 302 } 303 304 #ifdef TRACE_MESSAGES 305 printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n", 306 item->el_dest->nd_ID, 307 msg->header.typecookie, 308 msg->header.cmd, 309 msg->header.cmdstr, 310 msg->header.flags, 311 msg->header.token, 312 item->el_dest->nd_type->name); 313 #endif 314 SAVE_LINE(item); 315 /* 316 * We do not want to return from syscall until the item 317 * is processed by destination node. We register callback 318 * on the item, which will update priv->error when item 319 * was applied. 320 * If ng_snd_item() has queued item, we sleep until 321 * callback wakes us up. 322 */ 323 bzero(&apply, sizeof(apply)); 324 apply.apply = ng_socket_item_applied; 325 apply.context = priv; 326 item->apply = &apply; 327 priv->error = -1; 328 329 error = ng_snd_item(item, 0); 330 331 mtx_lock(&priv->mtx); 332 if (priv->error == -1) 333 msleep(priv, &priv->mtx, 0, "ngsock", 0); 334 mtx_unlock(&priv->mtx); 335 KASSERT(priv->error != -1, 336 ("ng_socket: priv->error wasn't updated")); 337 error = priv->error; 338 339 release: 340 if (path != NULL) 341 free(path, M_NETGRAPH_PATH); 342 if (control != NULL) 343 m_freem(control); 344 if (m != NULL) 345 m_freem(m); 346 return (error); 347 } 348 349 static int 350 ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 351 { 352 struct ngpcb *const pcbp = sotongpcb(so); 353 354 if (pcbp == 0) 355 return (EINVAL); 356 return (ng_bind(nam, pcbp)); 357 } 358 359 static int 360 ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 361 { 362 /* 363 * At this time refuse to do this.. it used to 364 * do something but it was undocumented and not used. 365 */ 366 printf("program tried to connect control socket to remote node\n"); 367 return (EINVAL); 368 } 369 370 /*************************************************************** 371 Data sockets 372 ***************************************************************/ 373 374 static int 375 ngd_attach(struct socket *so, int proto, struct thread *td) 376 { 377 struct ngpcb *const pcbp = sotongpcb(so); 378 379 if (pcbp != NULL) 380 return (EISCONN); 381 return (ng_attach_data(so)); 382 } 383 384 static void 385 ngd_detach(struct socket *so) 386 { 387 struct ngpcb *const pcbp = sotongpcb(so); 388 389 KASSERT(pcbp != NULL, ("ngd_detach: pcbp == NULL")); 390 ng_detach_common(pcbp, NG_DATA); 391 } 392 393 static int 394 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 395 struct mbuf *control, struct thread *td) 396 { 397 struct ngpcb *const pcbp = sotongpcb(so); 398 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 399 int len, error; 400 hook_p hook = NULL; 401 char hookname[NG_HOOKSIZ]; 402 403 if ((pcbp == NULL) || (control != NULL)) { 404 error = EINVAL; 405 goto release; 406 } 407 if (pcbp->sockdata == NULL) { 408 error = ENOTCONN; 409 goto release; 410 } 411 412 if (sap == NULL) 413 len = 0; /* Make compiler happy. */ 414 else 415 len = sap->sg_len - 2; 416 417 /* 418 * If the user used any of these ways to not specify an address 419 * then handle specially. 420 */ 421 if ((sap == NULL) || (len <= 0) || (*sap->sg_data == '\0')) { 422 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) { 423 error = EDESTADDRREQ; 424 goto release; 425 } 426 /* 427 * If exactly one hook exists, just use it. 428 * Special case to allow write(2) to work on an ng_socket. 429 */ 430 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks); 431 } else { 432 if (len >= NG_HOOKSIZ) { 433 error = EINVAL; 434 goto release; 435 } 436 437 /* 438 * chop off the sockaddr header, and make sure it's NUL 439 * terminated 440 */ 441 bcopy(sap->sg_data, hookname, len); 442 hookname[len] = '\0'; 443 444 /* Find the correct hook from 'hookname' */ 445 hook = ng_findhook(pcbp->sockdata->node, hookname); 446 if (hook == NULL) { 447 error = EHOSTUNREACH; 448 goto release; 449 } 450 } 451 452 /* Send data. */ 453 NG_SEND_DATA_FLAGS(error, hook, m, NG_WAITOK); 454 455 release: 456 if (control != NULL) 457 m_freem(control); 458 if (m != NULL) 459 m_freem(m); 460 return (error); 461 } 462 463 static int 464 ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 465 { 466 struct ngpcb *const pcbp = sotongpcb(so); 467 468 if (pcbp == 0) 469 return (EINVAL); 470 return (ng_connect_data(nam, pcbp)); 471 } 472 473 /* 474 * Used for both data and control sockets 475 */ 476 static int 477 ng_getsockaddr(struct socket *so, struct sockaddr **addr) 478 { 479 struct ngpcb *pcbp; 480 struct sockaddr_ng *sg; 481 int sg_len; 482 int error = 0; 483 484 /* Why isn't sg_data a `char[1]' ? :-( */ 485 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1; 486 487 pcbp = sotongpcb(so); 488 if ((pcbp == NULL) || (pcbp->sockdata == NULL)) 489 /* XXXGL: can this still happen? */ 490 return (EINVAL); 491 492 mtx_lock(&pcbp->sockdata->mtx); 493 if (pcbp->sockdata->node != NULL) { 494 node_p node = pcbp->sockdata->node; 495 int namelen = 0; /* silence compiler! */ 496 497 if (NG_NODE_HAS_NAME(node)) 498 sg_len += namelen = strlen(NG_NODE_NAME(node)); 499 500 sg = malloc(sg_len, M_SONAME, M_WAITOK | M_ZERO); 501 502 if (NG_NODE_HAS_NAME(node)) 503 bcopy(NG_NODE_NAME(node), sg->sg_data, namelen); 504 505 sg->sg_len = sg_len; 506 sg->sg_family = AF_NETGRAPH; 507 *addr = (struct sockaddr *)sg; 508 mtx_unlock(&pcbp->sockdata->mtx); 509 } else { 510 mtx_unlock(&pcbp->sockdata->mtx); 511 error = EINVAL; 512 } 513 514 return (error); 515 } 516 517 /* 518 * Attach a socket to it's protocol specific partner. 519 * For a control socket, actually create a netgraph node and attach 520 * to it as well. 521 */ 522 523 static int 524 ng_attach_cntl(struct socket *so) 525 { 526 struct ngsock *priv; 527 struct ngpcb *pcbp; 528 int error; 529 530 /* Allocate node private info */ 531 priv = malloc(sizeof(*priv), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO); 532 533 /* Setup protocol control block */ 534 if ((error = ng_attach_common(so, NG_CONTROL)) != 0) { 535 free(priv, M_NETGRAPH_SOCK); 536 return (error); 537 } 538 pcbp = sotongpcb(so); 539 540 /* Link the pcb the private data. */ 541 priv->ctlsock = pcbp; 542 pcbp->sockdata = priv; 543 priv->refs++; 544 545 /* Initialize mutex. */ 546 mtx_init(&priv->mtx, "ng_socket", NULL, MTX_DEF); 547 548 /* Make the generic node components */ 549 if ((error = ng_make_node_common(&typestruct, &priv->node)) != 0) { 550 free(priv, M_NETGRAPH_SOCK); 551 ng_detach_common(pcbp, NG_CONTROL); 552 return (error); 553 } 554 555 /* Store a hint for netstat(1). */ 556 priv->node_id = priv->node->nd_ID; 557 558 /* Link the node and the private data. */ 559 NG_NODE_SET_PRIVATE(priv->node, priv); 560 NG_NODE_REF(priv->node); 561 priv->refs++; 562 563 return (0); 564 } 565 566 static int 567 ng_attach_data(struct socket *so) 568 { 569 return (ng_attach_common(so, NG_DATA)); 570 } 571 572 /* 573 * Set up a socket protocol control block. 574 * This code is shared between control and data sockets. 575 */ 576 static int 577 ng_attach_common(struct socket *so, int type) 578 { 579 struct ngpcb *pcbp; 580 int error; 581 582 /* Standard socket setup stuff. */ 583 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace); 584 if (error) 585 return (error); 586 587 /* Allocate the pcb. */ 588 pcbp = malloc(sizeof(struct ngpcb), M_PCB, M_WAITOK | M_ZERO); 589 pcbp->type = type; 590 591 /* Link the pcb and the socket. */ 592 so->so_pcb = (caddr_t)pcbp; 593 pcbp->ng_socket = so; 594 595 /* Add the socket to linked list */ 596 mtx_lock(&ngsocketlist_mtx); 597 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks); 598 mtx_unlock(&ngsocketlist_mtx); 599 return (0); 600 } 601 602 /* 603 * Disassociate the socket from it's protocol specific 604 * partner. If it's attached to a node's private data structure, 605 * then unlink from that too. If we were the last socket attached to it, 606 * then shut down the entire node. Shared code for control and data sockets. 607 */ 608 static void 609 ng_detach_common(struct ngpcb *pcbp, int which) 610 { 611 struct ngsock *priv = pcbp->sockdata; 612 613 if (priv != NULL) { 614 mtx_lock(&priv->mtx); 615 616 switch (which) { 617 case NG_CONTROL: 618 priv->ctlsock = NULL; 619 break; 620 case NG_DATA: 621 priv->datasock = NULL; 622 break; 623 default: 624 panic(__func__); 625 } 626 pcbp->sockdata = NULL; 627 628 ng_socket_free_priv(priv); 629 } 630 631 pcbp->ng_socket->so_pcb = NULL; 632 mtx_lock(&ngsocketlist_mtx); 633 LIST_REMOVE(pcbp, socks); 634 mtx_unlock(&ngsocketlist_mtx); 635 free(pcbp, M_PCB); 636 } 637 638 /* 639 * Remove a reference from node private data. 640 */ 641 static void 642 ng_socket_free_priv(struct ngsock *priv) 643 { 644 mtx_assert(&priv->mtx, MA_OWNED); 645 646 priv->refs--; 647 648 if (priv->refs == 0) { 649 mtx_destroy(&priv->mtx); 650 free(priv, M_NETGRAPH_SOCK); 651 return; 652 } 653 654 if ((priv->refs == 1) && (priv->node != NULL)) { 655 node_p node = priv->node; 656 657 priv->node = NULL; 658 mtx_unlock(&priv->mtx); 659 NG_NODE_UNREF(node); 660 ng_rmnode_self(node); 661 } else 662 mtx_unlock(&priv->mtx); 663 } 664 665 #ifdef NOTYET 666 /* 667 * File descriptors can be passed into an AF_NETGRAPH socket. 668 * Note, that file descriptors cannot be passed OUT. 669 * Only character device descriptors are accepted. 670 * Character devices are useful to connect a graph to a device, 671 * which after all is the purpose of this whole system. 672 */ 673 static int 674 ng_internalize(struct mbuf *control, struct thread *td) 675 { 676 const struct cmsghdr *cm = mtod(control, const struct cmsghdr *); 677 struct file *fp; 678 struct vnode *vn; 679 int oldfds; 680 int fd; 681 682 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || 683 cm->cmsg_len != control->m_len) { 684 TRAP_ERROR; 685 return (EINVAL); 686 } 687 688 /* Check there is only one FD. XXX what would more than one signify? */ 689 oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int); 690 if (oldfds != 1) { 691 TRAP_ERROR; 692 return (EINVAL); 693 } 694 695 /* Check that the FD given is legit. and change it to a pointer to a 696 * struct file. */ 697 fd = CMSG_DATA(cm); 698 if ((error = fget(td, fd, &fp)) != 0) 699 return (error); 700 701 /* Depending on what kind of resource it is, act differently. For 702 * devices, we treat it as a file. For an AF_NETGRAPH socket, 703 * shortcut straight to the node. */ 704 switch (fp->f_type) { 705 case DTYPE_VNODE: 706 vn = fp->f_data; 707 if (vn && (vn->v_type == VCHR)) { 708 /* for a VCHR, actually reference the FILE */ 709 fhold(fp); 710 /* XXX then what :) */ 711 /* how to pass on to other modules? */ 712 } else { 713 fdrop(fp, td); 714 TRAP_ERROR; 715 return (EINVAL); 716 } 717 break; 718 default: 719 fdrop(fp, td); 720 TRAP_ERROR; 721 return (EINVAL); 722 } 723 fdrop(fp, td); 724 return (0); 725 } 726 #endif /* NOTYET */ 727 728 /* 729 * Connect the data socket to a named control socket node. 730 */ 731 static int 732 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp) 733 { 734 struct sockaddr_ng *sap; 735 node_p farnode; 736 struct ngsock *priv; 737 int error; 738 item_p item; 739 740 /* If we are already connected, don't do it again. */ 741 if (pcbp->sockdata != NULL) 742 return (EISCONN); 743 744 /* 745 * Find the target (victim) and check it doesn't already have 746 * a data socket. Also check it is a 'socket' type node. 747 * Use ng_package_data() and ng_address_path() to do this. 748 */ 749 750 sap = (struct sockaddr_ng *) nam; 751 /* The item will hold the node reference. */ 752 item = ng_package_data(NULL, NG_WAITOK); 753 754 if ((error = ng_address_path(NULL, item, sap->sg_data, 0))) 755 return (error); /* item is freed on failure */ 756 757 /* 758 * Extract node from item and free item. Remember we now have 759 * a reference on the node. The item holds it for us. 760 * when we free the item we release the reference. 761 */ 762 farnode = item->el_dest; /* shortcut */ 763 if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) { 764 NG_FREE_ITEM(item); /* drop the reference to the node */ 765 return (EINVAL); 766 } 767 priv = NG_NODE_PRIVATE(farnode); 768 if (priv->datasock != NULL) { 769 NG_FREE_ITEM(item); /* drop the reference to the node */ 770 return (EADDRINUSE); 771 } 772 773 /* 774 * Link the PCB and the private data struct. and note the extra 775 * reference. Drop the extra reference on the node. 776 */ 777 mtx_lock(&priv->mtx); 778 priv->datasock = pcbp; 779 pcbp->sockdata = priv; 780 priv->refs++; 781 mtx_unlock(&priv->mtx); 782 NG_FREE_ITEM(item); /* drop the reference to the node */ 783 return (0); 784 } 785 786 /* 787 * Binding a socket means giving the corresponding node a name 788 */ 789 static int 790 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp) 791 { 792 struct ngsock *const priv = pcbp->sockdata; 793 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam; 794 795 if (priv == NULL) { 796 TRAP_ERROR; 797 return (EINVAL); 798 } 799 if ((sap->sg_len < 4) || (sap->sg_len > (NG_NODESIZ + 2)) || 800 (sap->sg_data[0] == '\0') || 801 (sap->sg_data[sap->sg_len - 3] != '\0')) { 802 TRAP_ERROR; 803 return (EINVAL); 804 } 805 return (ng_name_node(priv->node, sap->sg_data)); 806 } 807 808 /*************************************************************** 809 Netgraph node 810 ***************************************************************/ 811 812 /* 813 * You can only create new nodes from the socket end of things. 814 */ 815 static int 816 ngs_constructor(node_p nodep) 817 { 818 return (EINVAL); 819 } 820 821 /* 822 * We allow any hook to be connected to the node. 823 * There is no per-hook private information though. 824 */ 825 static int 826 ngs_newhook(node_p node, hook_p hook, const char *name) 827 { 828 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node)); 829 return (0); 830 } 831 832 /* 833 * If only one hook, allow read(2) and write(2) to work. 834 */ 835 static int 836 ngs_connect(hook_p hook) 837 { 838 node_p node = NG_HOOK_NODE(hook); 839 struct ngsock *priv = NG_NODE_PRIVATE(node); 840 841 if ((priv->datasock) && (priv->datasock->ng_socket)) { 842 if (NG_NODE_NUMHOOKS(node) == 1) 843 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED; 844 else 845 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED; 846 } 847 return (0); 848 } 849 850 /* 851 * Incoming messages get passed up to the control socket. 852 * Unless they are for us specifically (socket_type) 853 */ 854 static int 855 ngs_rcvmsg(node_p node, item_p item, hook_p lasthook) 856 { 857 struct ngsock *const priv = NG_NODE_PRIVATE(node); 858 struct ngpcb *pcbp; 859 struct socket *so; 860 struct sockaddr_ng addr; 861 struct ng_mesg *msg; 862 struct mbuf *m; 863 ng_ID_t retaddr = NGI_RETADDR(item); 864 int addrlen; 865 int error = 0; 866 867 NGI_GET_MSG(item, msg); 868 NG_FREE_ITEM(item); 869 870 /* 871 * Grab priv->mtx here to prevent destroying of control socket 872 * after checking that priv->ctlsock is not NULL. 873 */ 874 mtx_lock(&priv->mtx); 875 pcbp = priv->ctlsock; 876 877 /* 878 * Only allow mesgs to be passed if we have the control socket. 879 * Data sockets can only support the generic messages. 880 */ 881 if (pcbp == NULL) { 882 mtx_unlock(&priv->mtx); 883 TRAP_ERROR; 884 NG_FREE_MSG(msg); 885 return (EINVAL); 886 } 887 so = pcbp->ng_socket; 888 SOCKBUF_LOCK(&so->so_rcv); 889 890 /* As long as the race is handled, priv->mtx may be unlocked now. */ 891 mtx_unlock(&priv->mtx); 892 893 #ifdef TRACE_MESSAGES 894 printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n", 895 retaddr, 896 msg->header.typecookie, 897 msg->header.cmd, 898 msg->header.cmdstr, 899 msg->header.flags, 900 msg->header.token); 901 #endif 902 903 if (msg->header.typecookie == NGM_SOCKET_COOKIE) { 904 switch (msg->header.cmd) { 905 case NGM_SOCK_CMD_NOLINGER: 906 priv->flags |= NGS_FLAG_NOLINGER; 907 break; 908 case NGM_SOCK_CMD_LINGER: 909 priv->flags &= ~NGS_FLAG_NOLINGER; 910 break; 911 default: 912 error = EINVAL; /* unknown command */ 913 } 914 SOCKBUF_UNLOCK(&so->so_rcv); 915 916 /* Free the message and return. */ 917 NG_FREE_MSG(msg); 918 return (error); 919 } 920 921 /* Get the return address into a sockaddr. */ 922 bzero(&addr, sizeof(addr)); 923 addr.sg_len = sizeof(addr); 924 addr.sg_family = AF_NETGRAPH; 925 addrlen = snprintf((char *)&addr.sg_data, sizeof(addr.sg_data), 926 "[%x]:", retaddr); 927 if (addrlen < 0 || addrlen > sizeof(addr.sg_data)) { 928 SOCKBUF_UNLOCK(&so->so_rcv); 929 printf("%s: snprintf([%x]) failed - %d\n", __func__, retaddr, 930 addrlen); 931 NG_FREE_MSG(msg); 932 return (EINVAL); 933 } 934 935 /* Copy the message itself into an mbuf chain. */ 936 m = m_devget((caddr_t)msg, sizeof(struct ng_mesg) + msg->header.arglen, 937 0, NULL, NULL); 938 939 /* 940 * Here we free the message. We need to do that 941 * regardless of whether we got mbufs. 942 */ 943 NG_FREE_MSG(msg); 944 945 if (m == NULL) { 946 SOCKBUF_UNLOCK(&so->so_rcv); 947 TRAP_ERROR; 948 return (ENOBUFS); 949 } 950 951 /* Send it up to the socket. */ 952 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&addr, m, 953 NULL) == 0) { 954 SOCKBUF_UNLOCK(&so->so_rcv); 955 TRAP_ERROR; 956 m_freem(m); 957 return (ENOBUFS); 958 } 959 sorwakeup_locked(so); 960 961 return (error); 962 } 963 964 /* 965 * Receive data on a hook 966 */ 967 static int 968 ngs_rcvdata(hook_p hook, item_p item) 969 { 970 struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 971 struct ngpcb *const pcbp = priv->datasock; 972 struct socket *so; 973 struct sockaddr_ng *addr; 974 char *addrbuf[NG_HOOKSIZ + 4]; 975 int addrlen; 976 struct mbuf *m; 977 978 NGI_GET_M(item, m); 979 NG_FREE_ITEM(item); 980 981 /* If there is no data socket, black-hole it. */ 982 if (pcbp == NULL) { 983 NG_FREE_M(m); 984 return (0); 985 } 986 so = pcbp->ng_socket; 987 988 /* Get the return address into a sockaddr. */ 989 addrlen = strlen(NG_HOOK_NAME(hook)); /* <= NG_HOOKSIZ - 1 */ 990 addr = (struct sockaddr_ng *) addrbuf; 991 addr->sg_len = addrlen + 3; 992 addr->sg_family = AF_NETGRAPH; 993 bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen); 994 addr->sg_data[addrlen] = '\0'; 995 996 /* Try to tell the socket which hook it came in on. */ 997 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)addr, m, NULL) == 0) { 998 m_freem(m); 999 TRAP_ERROR; 1000 return (ENOBUFS); 1001 } 1002 sorwakeup(so); 1003 return (0); 1004 } 1005 1006 /* 1007 * Hook disconnection 1008 * 1009 * For this type, removal of the last link destroys the node 1010 * if the NOLINGER flag is set. 1011 */ 1012 static int 1013 ngs_disconnect(hook_p hook) 1014 { 1015 node_p node = NG_HOOK_NODE(hook); 1016 struct ngsock *const priv = NG_NODE_PRIVATE(node); 1017 1018 if ((priv->datasock) && (priv->datasock->ng_socket)) { 1019 if (NG_NODE_NUMHOOKS(node) == 1) 1020 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED; 1021 else 1022 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED; 1023 } 1024 1025 if ((priv->flags & NGS_FLAG_NOLINGER) && 1026 (NG_NODE_NUMHOOKS(node) == 0) && (NG_NODE_IS_VALID(node))) 1027 ng_rmnode_self(node); 1028 1029 return (0); 1030 } 1031 1032 /* 1033 * Do local shutdown processing. 1034 * In this case, that involves making sure the socket 1035 * knows we should be shutting down. 1036 */ 1037 static int 1038 ngs_shutdown(node_p node) 1039 { 1040 struct ngsock *const priv = NG_NODE_PRIVATE(node); 1041 struct ngpcb *dpcbp, *pcbp; 1042 1043 mtx_lock(&priv->mtx); 1044 dpcbp = priv->datasock; 1045 pcbp = priv->ctlsock; 1046 1047 if (dpcbp != NULL) 1048 soisdisconnected(dpcbp->ng_socket); 1049 1050 if (pcbp != NULL) 1051 soisdisconnected(pcbp->ng_socket); 1052 1053 priv->node = NULL; 1054 NG_NODE_SET_PRIVATE(node, NULL); 1055 ng_socket_free_priv(priv); 1056 1057 NG_NODE_UNREF(node); 1058 return (0); 1059 } 1060 1061 static void 1062 ng_socket_item_applied(void *context, int error) 1063 { 1064 struct ngsock *const priv = (struct ngsock *)context; 1065 1066 mtx_lock(&priv->mtx); 1067 priv->error = error; 1068 wakeup(priv); 1069 mtx_unlock(&priv->mtx); 1070 1071 } 1072 1073 static int 1074 dummy_disconnect(struct socket *so) 1075 { 1076 return (0); 1077 } 1078 /* 1079 * Control and data socket type descriptors 1080 * 1081 * XXXRW: Perhaps _close should do something? 1082 */ 1083 1084 static struct pr_usrreqs ngc_usrreqs = { 1085 .pru_abort = NULL, 1086 .pru_attach = ngc_attach, 1087 .pru_bind = ngc_bind, 1088 .pru_connect = ngc_connect, 1089 .pru_detach = ngc_detach, 1090 .pru_disconnect = dummy_disconnect, 1091 .pru_peeraddr = NULL, 1092 .pru_send = ngc_send, 1093 .pru_shutdown = NULL, 1094 .pru_sockaddr = ng_getsockaddr, 1095 .pru_close = NULL, 1096 }; 1097 1098 static struct pr_usrreqs ngd_usrreqs = { 1099 .pru_abort = NULL, 1100 .pru_attach = ngd_attach, 1101 .pru_bind = NULL, 1102 .pru_connect = ngd_connect, 1103 .pru_detach = ngd_detach, 1104 .pru_disconnect = dummy_disconnect, 1105 .pru_peeraddr = NULL, 1106 .pru_send = ngd_send, 1107 .pru_shutdown = NULL, 1108 .pru_sockaddr = ng_getsockaddr, 1109 .pru_close = NULL, 1110 }; 1111 1112 /* 1113 * Definitions of protocols supported in the NETGRAPH domain. 1114 */ 1115 1116 extern struct domain ngdomain; /* stop compiler warnings */ 1117 1118 static struct protosw ngsw[] = { 1119 { 1120 .pr_type = SOCK_DGRAM, 1121 .pr_domain = &ngdomain, 1122 .pr_protocol = NG_CONTROL, 1123 .pr_flags = PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, 1124 .pr_usrreqs = &ngc_usrreqs 1125 }, 1126 { 1127 .pr_type = SOCK_DGRAM, 1128 .pr_domain = &ngdomain, 1129 .pr_protocol = NG_DATA, 1130 .pr_flags = PR_ATOMIC | PR_ADDR, 1131 .pr_usrreqs = &ngd_usrreqs 1132 } 1133 }; 1134 1135 struct domain ngdomain = { 1136 .dom_family = AF_NETGRAPH, 1137 .dom_name = "netgraph", 1138 .dom_protosw = ngsw, 1139 .dom_protoswNPROTOSW = &ngsw[sizeof(ngsw) / sizeof(ngsw[0])] 1140 }; 1141 1142 /* 1143 * Handle loading and unloading for this node type. 1144 * This is to handle auxiliary linkages (e.g protocol domain addition). 1145 */ 1146 static int 1147 ngs_mod_event(module_t mod, int event, void *data) 1148 { 1149 int error = 0; 1150 1151 switch (event) { 1152 case MOD_LOAD: 1153 mtx_init(&ngsocketlist_mtx, "ng_socketlist", NULL, MTX_DEF); 1154 break; 1155 case MOD_UNLOAD: 1156 /* Ensure there are no open netgraph sockets. */ 1157 if (!LIST_EMPTY(&ngsocklist)) { 1158 error = EBUSY; 1159 break; 1160 } 1161 #ifdef NOTYET 1162 /* Unregister protocol domain XXX can't do this yet.. */ 1163 #endif 1164 error = EBUSY; 1165 break; 1166 default: 1167 error = EOPNOTSUPP; 1168 break; 1169 } 1170 return (error); 1171 } 1172 1173 VNET_DOMAIN_SET(ng); 1174 1175 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, ""); 1176 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA"); 1177 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, ""); 1178 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL"); 1179 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, ""); 1180
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