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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/9.0/sys/netgraph/ng_socket.c 224778 2011-08-11 12:30:23Z rwatson $ 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_ULONG(_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_ULONG(_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 node_p node; 529 int error; 530 531 /* Setup protocol control block */ 532 if ((error = ng_attach_common(so, NG_CONTROL)) != 0) 533 return (error); 534 pcbp = sotongpcb(so); 535 536 /* Make the generic node components */ 537 if ((error = ng_make_node_common(&typestruct, &node)) != 0) { 538 ng_detach_common(pcbp, NG_CONTROL); 539 return (error); 540 } 541 542 /* Allocate node private info */ 543 priv = malloc(sizeof(*priv), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO); 544 545 /* Initialize mutex. */ 546 mtx_init(&priv->mtx, "ng_socket", NULL, MTX_DEF); 547 548 /* Link the pcb the private data. */ 549 priv->ctlsock = pcbp; 550 pcbp->sockdata = priv; 551 priv->refs++; 552 priv->node = node; 553 554 /* Store a hint for netstat(1). */ 555 priv->node_id = priv->node->nd_ID; 556 557 /* Link the node and the private data. */ 558 NG_NODE_SET_PRIVATE(priv->node, priv); 559 NG_NODE_REF(priv->node); 560 priv->refs++; 561 562 return (0); 563 } 564 565 static int 566 ng_attach_data(struct socket *so) 567 { 568 return (ng_attach_common(so, NG_DATA)); 569 } 570 571 /* 572 * Set up a socket protocol control block. 573 * This code is shared between control and data sockets. 574 */ 575 static int 576 ng_attach_common(struct socket *so, int type) 577 { 578 struct ngpcb *pcbp; 579 int error; 580 581 /* Standard socket setup stuff. */ 582 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace); 583 if (error) 584 return (error); 585 586 /* Allocate the pcb. */ 587 pcbp = malloc(sizeof(struct ngpcb), M_PCB, M_WAITOK | M_ZERO); 588 pcbp->type = type; 589 590 /* Link the pcb and the socket. */ 591 so->so_pcb = (caddr_t)pcbp; 592 pcbp->ng_socket = so; 593 594 /* Add the socket to linked list */ 595 mtx_lock(&ngsocketlist_mtx); 596 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks); 597 mtx_unlock(&ngsocketlist_mtx); 598 return (0); 599 } 600 601 /* 602 * Disassociate the socket from it's protocol specific 603 * partner. If it's attached to a node's private data structure, 604 * then unlink from that too. If we were the last socket attached to it, 605 * then shut down the entire node. Shared code for control and data sockets. 606 */ 607 static void 608 ng_detach_common(struct ngpcb *pcbp, int which) 609 { 610 struct ngsock *priv = pcbp->sockdata; 611 612 if (priv != NULL) { 613 mtx_lock(&priv->mtx); 614 615 switch (which) { 616 case NG_CONTROL: 617 priv->ctlsock = NULL; 618 break; 619 case NG_DATA: 620 priv->datasock = NULL; 621 break; 622 default: 623 panic("%s", __func__); 624 } 625 pcbp->sockdata = NULL; 626 627 ng_socket_free_priv(priv); 628 } 629 630 pcbp->ng_socket->so_pcb = NULL; 631 mtx_lock(&ngsocketlist_mtx); 632 LIST_REMOVE(pcbp, socks); 633 mtx_unlock(&ngsocketlist_mtx); 634 free(pcbp, M_PCB); 635 } 636 637 /* 638 * Remove a reference from node private data. 639 */ 640 static void 641 ng_socket_free_priv(struct ngsock *priv) 642 { 643 mtx_assert(&priv->mtx, MA_OWNED); 644 645 priv->refs--; 646 647 if (priv->refs == 0) { 648 mtx_destroy(&priv->mtx); 649 free(priv, M_NETGRAPH_SOCK); 650 return; 651 } 652 653 if ((priv->refs == 1) && (priv->node != NULL)) { 654 node_p node = priv->node; 655 656 priv->node = NULL; 657 mtx_unlock(&priv->mtx); 658 NG_NODE_UNREF(node); 659 ng_rmnode_self(node); 660 } else 661 mtx_unlock(&priv->mtx); 662 } 663 664 #ifdef NOTYET 665 /* 666 * File descriptors can be passed into an AF_NETGRAPH socket. 667 * Note, that file descriptors cannot be passed OUT. 668 * Only character device descriptors are accepted. 669 * Character devices are useful to connect a graph to a device, 670 * which after all is the purpose of this whole system. 671 */ 672 static int 673 ng_internalize(struct mbuf *control, struct thread *td) 674 { 675 const struct cmsghdr *cm = mtod(control, const struct cmsghdr *); 676 struct file *fp; 677 struct vnode *vn; 678 int oldfds; 679 int fd; 680 681 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || 682 cm->cmsg_len != control->m_len) { 683 TRAP_ERROR; 684 return (EINVAL); 685 } 686 687 /* Check there is only one FD. XXX what would more than one signify? */ 688 oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int); 689 if (oldfds != 1) { 690 TRAP_ERROR; 691 return (EINVAL); 692 } 693 694 /* Check that the FD given is legit. and change it to a pointer to a 695 * struct file. */ 696 fd = CMSG_DATA(cm); 697 if ((error = fget(td, fd, 0, &fp)) != 0) 698 return (error); 699 700 /* Depending on what kind of resource it is, act differently. For 701 * devices, we treat it as a file. For an AF_NETGRAPH socket, 702 * shortcut straight to the node. */ 703 switch (fp->f_type) { 704 case DTYPE_VNODE: 705 vn = fp->f_data; 706 if (vn && (vn->v_type == VCHR)) { 707 /* for a VCHR, actually reference the FILE */ 708 fhold(fp); 709 /* XXX then what :) */ 710 /* how to pass on to other modules? */ 711 } else { 712 fdrop(fp, td); 713 TRAP_ERROR; 714 return (EINVAL); 715 } 716 break; 717 default: 718 fdrop(fp, td); 719 TRAP_ERROR; 720 return (EINVAL); 721 } 722 fdrop(fp, td); 723 return (0); 724 } 725 #endif /* NOTYET */ 726 727 /* 728 * Connect the data socket to a named control socket node. 729 */ 730 static int 731 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp) 732 { 733 struct sockaddr_ng *sap; 734 node_p farnode; 735 struct ngsock *priv; 736 int error; 737 item_p item; 738 739 /* If we are already connected, don't do it again. */ 740 if (pcbp->sockdata != NULL) 741 return (EISCONN); 742 743 /* 744 * Find the target (victim) and check it doesn't already have 745 * a data socket. Also check it is a 'socket' type node. 746 * Use ng_package_data() and ng_address_path() to do this. 747 */ 748 749 sap = (struct sockaddr_ng *) nam; 750 /* The item will hold the node reference. */ 751 item = ng_package_data(NULL, NG_WAITOK); 752 753 if ((error = ng_address_path(NULL, item, sap->sg_data, 0))) 754 return (error); /* item is freed on failure */ 755 756 /* 757 * Extract node from item and free item. Remember we now have 758 * a reference on the node. The item holds it for us. 759 * when we free the item we release the reference. 760 */ 761 farnode = item->el_dest; /* shortcut */ 762 if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) { 763 NG_FREE_ITEM(item); /* drop the reference to the node */ 764 return (EINVAL); 765 } 766 priv = NG_NODE_PRIVATE(farnode); 767 if (priv->datasock != NULL) { 768 NG_FREE_ITEM(item); /* drop the reference to the node */ 769 return (EADDRINUSE); 770 } 771 772 /* 773 * Link the PCB and the private data struct. and note the extra 774 * reference. Drop the extra reference on the node. 775 */ 776 mtx_lock(&priv->mtx); 777 priv->datasock = pcbp; 778 pcbp->sockdata = priv; 779 priv->refs++; 780 mtx_unlock(&priv->mtx); 781 NG_FREE_ITEM(item); /* drop the reference to the node */ 782 return (0); 783 } 784 785 /* 786 * Binding a socket means giving the corresponding node a name 787 */ 788 static int 789 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp) 790 { 791 struct ngsock *const priv = pcbp->sockdata; 792 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam; 793 794 if (priv == NULL) { 795 TRAP_ERROR; 796 return (EINVAL); 797 } 798 if ((sap->sg_len < 4) || (sap->sg_len > (NG_NODESIZ + 2)) || 799 (sap->sg_data[0] == '\0') || 800 (sap->sg_data[sap->sg_len - 3] != '\0')) { 801 TRAP_ERROR; 802 return (EINVAL); 803 } 804 return (ng_name_node(priv->node, sap->sg_data)); 805 } 806 807 /*************************************************************** 808 Netgraph node 809 ***************************************************************/ 810 811 /* 812 * You can only create new nodes from the socket end of things. 813 */ 814 static int 815 ngs_constructor(node_p nodep) 816 { 817 return (EINVAL); 818 } 819 820 /* 821 * We allow any hook to be connected to the node. 822 * There is no per-hook private information though. 823 */ 824 static int 825 ngs_newhook(node_p node, hook_p hook, const char *name) 826 { 827 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node)); 828 return (0); 829 } 830 831 /* 832 * If only one hook, allow read(2) and write(2) to work. 833 */ 834 static int 835 ngs_connect(hook_p hook) 836 { 837 node_p node = NG_HOOK_NODE(hook); 838 struct ngsock *priv = NG_NODE_PRIVATE(node); 839 840 if ((priv->datasock) && (priv->datasock->ng_socket)) { 841 if (NG_NODE_NUMHOOKS(node) == 1) 842 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED; 843 else 844 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED; 845 } 846 return (0); 847 } 848 849 /* 850 * Incoming messages get passed up to the control socket. 851 * Unless they are for us specifically (socket_type) 852 */ 853 static int 854 ngs_rcvmsg(node_p node, item_p item, hook_p lasthook) 855 { 856 struct ngsock *const priv = NG_NODE_PRIVATE(node); 857 struct ngpcb *pcbp; 858 struct socket *so; 859 struct sockaddr_ng addr; 860 struct ng_mesg *msg; 861 struct mbuf *m; 862 ng_ID_t retaddr = NGI_RETADDR(item); 863 int addrlen; 864 int error = 0; 865 866 NGI_GET_MSG(item, msg); 867 NG_FREE_ITEM(item); 868 869 /* 870 * Grab priv->mtx here to prevent destroying of control socket 871 * after checking that priv->ctlsock is not NULL. 872 */ 873 mtx_lock(&priv->mtx); 874 pcbp = priv->ctlsock; 875 876 /* 877 * Only allow mesgs to be passed if we have the control socket. 878 * Data sockets can only support the generic messages. 879 */ 880 if (pcbp == NULL) { 881 mtx_unlock(&priv->mtx); 882 TRAP_ERROR; 883 NG_FREE_MSG(msg); 884 return (EINVAL); 885 } 886 so = pcbp->ng_socket; 887 SOCKBUF_LOCK(&so->so_rcv); 888 889 /* As long as the race is handled, priv->mtx may be unlocked now. */ 890 mtx_unlock(&priv->mtx); 891 892 #ifdef TRACE_MESSAGES 893 printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n", 894 retaddr, 895 msg->header.typecookie, 896 msg->header.cmd, 897 msg->header.cmdstr, 898 msg->header.flags, 899 msg->header.token); 900 #endif 901 902 if (msg->header.typecookie == NGM_SOCKET_COOKIE) { 903 switch (msg->header.cmd) { 904 case NGM_SOCK_CMD_NOLINGER: 905 priv->flags |= NGS_FLAG_NOLINGER; 906 break; 907 case NGM_SOCK_CMD_LINGER: 908 priv->flags &= ~NGS_FLAG_NOLINGER; 909 break; 910 default: 911 error = EINVAL; /* unknown command */ 912 } 913 SOCKBUF_UNLOCK(&so->so_rcv); 914 915 /* Free the message and return. */ 916 NG_FREE_MSG(msg); 917 return (error); 918 } 919 920 /* Get the return address into a sockaddr. */ 921 bzero(&addr, sizeof(addr)); 922 addr.sg_len = sizeof(addr); 923 addr.sg_family = AF_NETGRAPH; 924 addrlen = snprintf((char *)&addr.sg_data, sizeof(addr.sg_data), 925 "[%x]:", retaddr); 926 if (addrlen < 0 || addrlen > sizeof(addr.sg_data)) { 927 SOCKBUF_UNLOCK(&so->so_rcv); 928 printf("%s: snprintf([%x]) failed - %d\n", __func__, retaddr, 929 addrlen); 930 NG_FREE_MSG(msg); 931 return (EINVAL); 932 } 933 934 /* Copy the message itself into an mbuf chain. */ 935 m = m_devget((caddr_t)msg, sizeof(struct ng_mesg) + msg->header.arglen, 936 0, NULL, NULL); 937 938 /* 939 * Here we free the message. We need to do that 940 * regardless of whether we got mbufs. 941 */ 942 NG_FREE_MSG(msg); 943 944 if (m == NULL) { 945 SOCKBUF_UNLOCK(&so->so_rcv); 946 TRAP_ERROR; 947 return (ENOBUFS); 948 } 949 950 /* Send it up to the socket. */ 951 if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&addr, m, 952 NULL) == 0) { 953 SOCKBUF_UNLOCK(&so->so_rcv); 954 TRAP_ERROR; 955 m_freem(m); 956 return (ENOBUFS); 957 } 958 sorwakeup_locked(so); 959 960 return (error); 961 } 962 963 /* 964 * Receive data on a hook 965 */ 966 static int 967 ngs_rcvdata(hook_p hook, item_p item) 968 { 969 struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 970 struct ngpcb *const pcbp = priv->datasock; 971 struct socket *so; 972 struct sockaddr_ng *addr; 973 char *addrbuf[NG_HOOKSIZ + 4]; 974 int addrlen; 975 struct mbuf *m; 976 977 NGI_GET_M(item, m); 978 NG_FREE_ITEM(item); 979 980 /* If there is no data socket, black-hole it. */ 981 if (pcbp == NULL) { 982 NG_FREE_M(m); 983 return (0); 984 } 985 so = pcbp->ng_socket; 986 987 /* Get the return address into a sockaddr. */ 988 addrlen = strlen(NG_HOOK_NAME(hook)); /* <= NG_HOOKSIZ - 1 */ 989 addr = (struct sockaddr_ng *) addrbuf; 990 addr->sg_len = addrlen + 3; 991 addr->sg_family = AF_NETGRAPH; 992 bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen); 993 addr->sg_data[addrlen] = '\0'; 994 995 /* Try to tell the socket which hook it came in on. */ 996 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)addr, m, NULL) == 0) { 997 m_freem(m); 998 TRAP_ERROR; 999 return (ENOBUFS); 1000 } 1001 sorwakeup(so); 1002 return (0); 1003 } 1004 1005 /* 1006 * Hook disconnection 1007 * 1008 * For this type, removal of the last link destroys the node 1009 * if the NOLINGER flag is set. 1010 */ 1011 static int 1012 ngs_disconnect(hook_p hook) 1013 { 1014 node_p node = NG_HOOK_NODE(hook); 1015 struct ngsock *const priv = NG_NODE_PRIVATE(node); 1016 1017 if ((priv->datasock) && (priv->datasock->ng_socket)) { 1018 if (NG_NODE_NUMHOOKS(node) == 1) 1019 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED; 1020 else 1021 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED; 1022 } 1023 1024 if ((priv->flags & NGS_FLAG_NOLINGER) && 1025 (NG_NODE_NUMHOOKS(node) == 0) && (NG_NODE_IS_VALID(node))) 1026 ng_rmnode_self(node); 1027 1028 return (0); 1029 } 1030 1031 /* 1032 * Do local shutdown processing. 1033 * In this case, that involves making sure the socket 1034 * knows we should be shutting down. 1035 */ 1036 static int 1037 ngs_shutdown(node_p node) 1038 { 1039 struct ngsock *const priv = NG_NODE_PRIVATE(node); 1040 struct ngpcb *dpcbp, *pcbp; 1041 1042 mtx_lock(&priv->mtx); 1043 dpcbp = priv->datasock; 1044 pcbp = priv->ctlsock; 1045 1046 if (dpcbp != NULL) 1047 soisdisconnected(dpcbp->ng_socket); 1048 1049 if (pcbp != NULL) 1050 soisdisconnected(pcbp->ng_socket); 1051 1052 priv->node = NULL; 1053 NG_NODE_SET_PRIVATE(node, NULL); 1054 ng_socket_free_priv(priv); 1055 1056 NG_NODE_UNREF(node); 1057 return (0); 1058 } 1059 1060 static void 1061 ng_socket_item_applied(void *context, int error) 1062 { 1063 struct ngsock *const priv = (struct ngsock *)context; 1064 1065 mtx_lock(&priv->mtx); 1066 priv->error = error; 1067 wakeup(priv); 1068 mtx_unlock(&priv->mtx); 1069 1070 } 1071 1072 static int 1073 dummy_disconnect(struct socket *so) 1074 { 1075 return (0); 1076 } 1077 /* 1078 * Control and data socket type descriptors 1079 * 1080 * XXXRW: Perhaps _close should do something? 1081 */ 1082 1083 static struct pr_usrreqs ngc_usrreqs = { 1084 .pru_abort = NULL, 1085 .pru_attach = ngc_attach, 1086 .pru_bind = ngc_bind, 1087 .pru_connect = ngc_connect, 1088 .pru_detach = ngc_detach, 1089 .pru_disconnect = dummy_disconnect, 1090 .pru_peeraddr = NULL, 1091 .pru_send = ngc_send, 1092 .pru_shutdown = NULL, 1093 .pru_sockaddr = ng_getsockaddr, 1094 .pru_close = NULL, 1095 }; 1096 1097 static struct pr_usrreqs ngd_usrreqs = { 1098 .pru_abort = NULL, 1099 .pru_attach = ngd_attach, 1100 .pru_bind = NULL, 1101 .pru_connect = ngd_connect, 1102 .pru_detach = ngd_detach, 1103 .pru_disconnect = dummy_disconnect, 1104 .pru_peeraddr = NULL, 1105 .pru_send = ngd_send, 1106 .pru_shutdown = NULL, 1107 .pru_sockaddr = ng_getsockaddr, 1108 .pru_close = NULL, 1109 }; 1110 1111 /* 1112 * Definitions of protocols supported in the NETGRAPH domain. 1113 */ 1114 1115 extern struct domain ngdomain; /* stop compiler warnings */ 1116 1117 static struct protosw ngsw[] = { 1118 { 1119 .pr_type = SOCK_DGRAM, 1120 .pr_domain = &ngdomain, 1121 .pr_protocol = NG_CONTROL, 1122 .pr_flags = PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, 1123 .pr_usrreqs = &ngc_usrreqs 1124 }, 1125 { 1126 .pr_type = SOCK_DGRAM, 1127 .pr_domain = &ngdomain, 1128 .pr_protocol = NG_DATA, 1129 .pr_flags = PR_ATOMIC | PR_ADDR, 1130 .pr_usrreqs = &ngd_usrreqs 1131 } 1132 }; 1133 1134 struct domain ngdomain = { 1135 .dom_family = AF_NETGRAPH, 1136 .dom_name = "netgraph", 1137 .dom_protosw = ngsw, 1138 .dom_protoswNPROTOSW = &ngsw[sizeof(ngsw) / sizeof(ngsw[0])] 1139 }; 1140 1141 /* 1142 * Handle loading and unloading for this node type. 1143 * This is to handle auxiliary linkages (e.g protocol domain addition). 1144 */ 1145 static int 1146 ngs_mod_event(module_t mod, int event, void *data) 1147 { 1148 int error = 0; 1149 1150 switch (event) { 1151 case MOD_LOAD: 1152 mtx_init(&ngsocketlist_mtx, "ng_socketlist", NULL, MTX_DEF); 1153 break; 1154 case MOD_UNLOAD: 1155 /* Ensure there are no open netgraph sockets. */ 1156 if (!LIST_EMPTY(&ngsocklist)) { 1157 error = EBUSY; 1158 break; 1159 } 1160 #ifdef NOTYET 1161 /* Unregister protocol domain XXX can't do this yet.. */ 1162 #endif 1163 error = EBUSY; 1164 break; 1165 default: 1166 error = EOPNOTSUPP; 1167 break; 1168 } 1169 return (error); 1170 } 1171 1172 VNET_DOMAIN_SET(ng); 1173 1174 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, ""); 1175 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA"); 1176 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, ""); 1177 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL"); 1178 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, ""); 1179
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