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