1 /* 2 * ng_socket.c 3 */ 4 5 /*- 6 * Copyright (c) 1996-1999 Whistle Communications, Inc. 7 * All rights reserved. 8 * 9 * Subject to the following obligations and disclaimer of warranty, use and 10 * redistribution of this software, in source or object code forms, with or 11 * without modifications are expressly permitted by Whistle Communications; 12 * provided, however, that: 13 * 1. Any and all reproductions of the source or object code must include the 14 * copyright notice above and the following disclaimer of warranties; and 15 * 2. No rights are granted, in any manner or form, to use Whistle 16 * Communications, Inc. trademarks, including the mark "WHISTLE 17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 18 * such appears in the above copyright notice or in the software. 19 * 20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 36 * OF SUCH DAMAGE. 37 * 38 * Author: Julian Elischer <julian@freebsd.org> 39 * 40 * $FreeBSD$ 41 * $Whistle: ng_socket.c,v 1.28 1999/11/01 09:24:52 julian Exp $ 42 */ 43 44 /* 45 * Netgraph socket nodes 46 * 47 * There are two types of netgraph sockets, control and data. 48 * Control sockets have a netgraph node, but data sockets are 49 * parasitic on control sockets, and have no node of their own. 50 */ 51 52 #include <sys/param.h> 53 #include <sys/domain.h> 54 #include <sys/errno.h> 55 #include <sys/kdb.h> 56 #include <sys/kernel.h> 57 #include <sys/linker.h> 58 #include <sys/lock.h> 59 #include <sys/malloc.h> 60 #include <sys/mbuf.h> 61 #include <sys/mutex.h> 62 #include <sys/protosw.h> 63 #include <sys/queue.h> 64 #include <sys/signalvar.h> 65 #include <sys/socket.h> 66 #include <sys/socketvar.h> 67 #include <sys/sx.h> 68 #include <sys/sysctl.h> 69 #include <sys/systm.h> 70 #ifdef NOTYET 71 #include <sys/vnode.h> 72 #endif 73 #include <netgraph/ng_message.h> 74 #include <netgraph/netgraph.h> 75 #include <netgraph/ng_socketvar.h> 76 #include <netgraph/ng_socket.h> 77 78 #ifdef NG_SEPARATE_MALLOC 79 MALLOC_DEFINE(M_NETGRAPH_PATH, "netgraph_path", "netgraph path info "); 80 MALLOC_DEFINE(M_NETGRAPH_SOCK, "netgraph_sock", "netgraph socket info "); 81 #else 82 #define M_NETGRAPH_PATH M_NETGRAPH 83 #define M_NETGRAPH_SOCK M_NETGRAPH 84 #endif 85 86 /* 87 * It's Ascii-art time! 88 * +-------------+ +-------------+ 89 * |socket (ctl)| |socket (data)| 90 * +-------------+ +-------------+ 91 * ^ ^ 92 * | | 93 * v v 94 * +-----------+ +-----------+ 95 * |pcb (ctl)| |pcb (data)| 96 * +-----------+ +-----------+ 97 * ^ ^ 98 * | | 99 * v v 100 * +--------------------------+ 101 * | Socket type private | 102 * | data | 103 * +--------------------------+ 104 * ^ 105 * | 106 * v 107 * +----------------+ 108 * | struct ng_node | 109 * +----------------+ 110 */ 111 112 /* Netgraph node methods */ 113 static ng_constructor_t ngs_constructor; 114 static ng_rcvmsg_t ngs_rcvmsg; 115 static ng_shutdown_t ngs_shutdown; 116 static ng_newhook_t ngs_newhook; 117 static ng_connect_t ngs_connect; 118 static ng_rcvdata_t ngs_rcvdata; 119 static ng_disconnect_t ngs_disconnect; 120 121 /* Internal methods */ 122 static int ng_attach_data(struct socket *so); 123 static int ng_attach_cntl(struct socket *so); 124 static int ng_attach_common(struct socket *so, int type); 125 static void ng_detach_common(node_p node, hook_p hook, void *arg1, int which); 126 /*static int ng_internalize(struct mbuf *m, struct thread *p); */ 127 128 static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp); 129 static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp); 130 131 static int ngs_mod_event(module_t mod, int event, void *data); 132 static int ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, 133 struct sockaddr_ng *addr); 134 135 /* Netgraph type descriptor */ 136 static struct ng_type typestruct = { 137 .version = NG_ABI_VERSION, 138 .name = NG_SOCKET_NODE_TYPE, 139 .mod_event = ngs_mod_event, 140 .constructor = ngs_constructor, 141 .rcvmsg = ngs_rcvmsg, 142 .shutdown = ngs_shutdown, 143 .newhook = ngs_newhook, 144 .connect = ngs_connect, 145 .rcvdata = ngs_rcvdata, 146 .disconnect = ngs_disconnect, 147 }; 148 NETGRAPH_INIT_ORDERED(socket, &typestruct, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 149 150 /* Buffer space */ 151 static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */ 152 SYSCTL_INT(_net_graph, OID_AUTO, maxdgram, CTLFLAG_RW, 153 &ngpdg_sendspace , 0, "Maximum outgoing Netgraph datagram size"); 154 static u_long ngpdg_recvspace = 20 * 1024; 155 SYSCTL_INT(_net_graph, OID_AUTO, recvspace, CTLFLAG_RW, 156 &ngpdg_recvspace , 0, "Maximum space for incoming Netgraph datagrams"); 157 158 /* List of all sockets */ 159 static LIST_HEAD(, ngpcb) ngsocklist; 160 161 static struct mtx ngsocketlist_mtx; 162 163 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb) 164 165 /* If getting unexplained errors returned, set this to "kdb_enter("X"); */ 166 #ifndef TRAP_ERROR 167 #define TRAP_ERROR 168 #endif 169 170 /*************************************************************** 171 Control sockets 172 ***************************************************************/ 173 174 static int 175 ngc_attach(struct socket *so, int proto, struct thread *td) 176 { 177 struct ngpcb *const pcbp = sotongpcb(so); 178 179 if (suser(td)) 180 return (EPERM); 181 if (pcbp != NULL) 182 return (EISCONN); 183 return (ng_attach_cntl(so)); 184 } 185 186 static int 187 ngc_detach(struct socket *so) 188 { 189 struct ngpcb *const pcbp = sotongpcb(so); 190 191 if (pcbp == NULL) 192 return (EINVAL); 193 194 /* 195 * If there is a node, then obtain netgraph locking first. 196 */ 197 if (pcbp->sockdata != NULL) 198 ng_send_fn1(pcbp->sockdata->node, NULL, &ng_detach_common, 199 pcbp, NG_CONTROL, NG_WAITOK); 200 else 201 ng_detach_common(NULL, NULL, pcbp, NG_CONTROL); 202 203 return (0); 204 } 205 206 static int 207 ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 208 struct mbuf *control, struct thread *td) 209 { 210 struct ngpcb *const pcbp = sotongpcb(so); 211 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 212 struct ng_mesg *msg; 213 struct mbuf *m0; 214 char *path = NULL; 215 int len, error = 0; 216 217 if (pcbp == NULL) { 218 error = EINVAL; 219 goto release; 220 } 221 #ifdef NOTYET 222 if (control && (error = ng_internalize(control, td))) { 223 if (pcbp->sockdata == NULL) { 224 error = ENOTCONN; 225 goto release; 226 } 227 } 228 #else /* NOTYET */ 229 if (control) { 230 error = EINVAL; 231 goto release; 232 } 233 #endif /* NOTYET */ 234 235 /* Require destination as there may be >= 1 hooks on this node */ 236 if (addr == NULL) { 237 error = EDESTADDRREQ; 238 goto release; 239 } 240 241 /* Allocate an expendable buffer for the path, chop off 242 * the sockaddr header, and make sure it's NUL terminated */ 243 len = sap->sg_len - 2; 244 MALLOC(path, char *, len + 1, M_NETGRAPH_PATH, M_WAITOK); 245 if (path == NULL) { 246 error = ENOMEM; 247 goto release; 248 } 249 bcopy(sap->sg_data, path, len); 250 path[len] = '\0'; 251 252 /* Move the actual message out of mbufs into a linear buffer. 253 * Start by adding up the size of the data. (could use mh_len?) */ 254 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next) 255 len += m0->m_len; 256 257 /* Move the data into a linear buffer as well. Messages are not 258 * delivered in mbufs. */ 259 MALLOC(msg, struct ng_mesg *, len + 1, M_NETGRAPH_MSG, M_WAITOK); 260 if (msg == NULL) { 261 error = ENOMEM; 262 goto release; 263 } 264 m_copydata(m, 0, len, (char *)msg); 265 266 if (msg->header.version != NG_VERSION) { 267 error = EINVAL; 268 goto release; 269 } 270 271 /* 272 * Hack alert! 273 * We look into the message and if it mkpeers a node of unknown type, we 274 * try to load it. We need to do this now, in syscall thread, because if 275 * message gets queued and applied later we will get panic. 276 */ 277 if (msg->header.typecookie == NGM_GENERIC_COOKIE && 278 msg->header.cmd == NGM_MKPEER) { 279 struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data; 280 struct ng_type *type; 281 282 if ((type = ng_findtype(mkp->type)) == NULL) { 283 char filename[NG_TYPESIZ + 3]; 284 linker_file_t lf; 285 int error; 286 287 /* Not found, try to load it as a loadable module. */ 288 snprintf(filename, sizeof(filename), "ng_%s", 289 mkp->type); 290 mtx_lock(&Giant); 291 error = linker_load_module(NULL, filename, NULL, NULL, 292 &lf); 293 mtx_unlock(&Giant); 294 if (error != 0) { 295 FREE(msg, M_NETGRAPH_MSG); 296 goto release; 297 } 298 lf->userrefs++; 299 300 /* See if type has been loaded successfully. */ 301 if ((type = ng_findtype(mkp->type)) == NULL) { 302 FREE(msg, M_NETGRAPH_MSG); 303 error = ENXIO; 304 goto release; 305 } 306 } 307 } 308 309 #ifdef TRACE_MESSAGES 310 do { 311 item_p item; 312 if ((item = ng_package_msg(msg, M_WAITOK)) == NULL) { 313 (msg) = NULL; 314 (error) = ENOMEM; 315 printf("ng_package_msg: err=%d\n", error); 316 break; 317 } 318 if ((error = ng_address_path((pcbp->sockdata->node), (item), 319 (path), 0)) == 0) { 320 printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n", 321 item->el_dest->nd_ID, 322 msg->header.typecookie, 323 msg->header.cmd, 324 msg->header.cmdstr, 325 msg->header.flags, 326 msg->header.token, 327 item->el_dest->nd_type->name); 328 329 SAVE_LINE(item); 330 (error) = ng_snd_item((item), 0); 331 } else 332 printf("ng_address_path: errx=%d\n", error); 333 (msg) = NULL; 334 } while (0); 335 #else 336 /* The callee will free the msg when done. The path is our business. */ 337 NG_SEND_MSG_PATH(error, pcbp->sockdata->node, msg, path, 0); 338 #endif 339 340 release: 341 if (path != NULL) 342 FREE(path, M_NETGRAPH_PATH); 343 if (control != NULL) 344 m_freem(control); 345 if (m != NULL) 346 m_freem(m); 347 return (error); 348 } 349 350 static int 351 ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 352 { 353 struct ngpcb *const pcbp = sotongpcb(so); 354 355 if (pcbp == 0) 356 return (EINVAL); 357 return (ng_bind(nam, pcbp)); 358 } 359 360 static int 361 ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 362 { 363 printf(" program tried to connect control socket to remote node\n "); 364 /* 365 * At this time refuse to do this.. it used to 366 * do something but it was undocumented and not used. 367 */ 368 return (EINVAL); 369 } 370 371 /*************************************************************** 372 Data sockets 373 ***************************************************************/ 374 375 static int 376 ngd_attach(struct socket *so, int proto, struct thread *td) 377 { 378 struct ngpcb *const pcbp = sotongpcb(so); 379 380 if (pcbp != NULL) 381 return (EISCONN); 382 return (ng_attach_data(so)); 383 } 384 385 static int 386 ngd_detach(struct socket *so) 387 { 388 struct ngpcb *const pcbp = sotongpcb(so); 389 390 if (pcbp == NULL) 391 return (EINVAL); 392 393 /* 394 * If there is a node, then obtain netgraph locking first. 395 */ 396 if (pcbp->sockdata != NULL) 397 ng_send_fn1(pcbp->sockdata->node, NULL, &ng_detach_common, 398 pcbp, NG_DATA, NG_WAITOK); 399 else 400 ng_detach_common(NULL, NULL, pcbp, NG_DATA); 401 402 return (0); 403 } 404 405 static int 406 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 407 struct mbuf *control, struct thread *td) 408 { 409 struct ngpcb *const pcbp = sotongpcb(so); 410 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 411 int len, error; 412 hook_p hook = NULL; 413 char hookname[NG_HOOKSIZ]; 414 415 if ((pcbp == NULL) || (control != NULL)) { 416 error = EINVAL; 417 goto release; 418 } 419 if (pcbp->sockdata == NULL) { 420 error = ENOTCONN; 421 goto release; 422 } 423 /* 424 * If the user used any of these ways to not specify an address 425 * then handle specially. 426 */ 427 if ((sap == NULL) 428 || ((len = sap->sg_len - 2) <= 0) 429 || (*sap->sg_data == '\0')) { 430 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) { 431 error = EDESTADDRREQ; 432 goto release; 433 } 434 /* 435 * if exactly one hook exists, just use it. 436 * Special case to allow write(2) to work on an ng_socket. 437 */ 438 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks); 439 } else { 440 if (len >= NG_HOOKSIZ) { 441 error = EINVAL; 442 goto release; 443 } 444 445 /* 446 * chop off the sockaddr header, and make sure it's NUL 447 * terminated 448 */ 449 bcopy(sap->sg_data, hookname, len); 450 hookname[len] = '\0'; 451 452 /* Find the correct hook from 'hookname' */ 453 LIST_FOREACH(hook, &pcbp->sockdata->node->nd_hooks, hk_hooks) { 454 if (strcmp(hookname, NG_HOOK_NAME(hook)) == 0) { 455 break; 456 } 457 } 458 if (hook == NULL) { 459 error = EHOSTUNREACH; 460 } 461 } 462 463 /* Send data (OK if hook is NULL) */ 464 NG_SEND_DATA_ONLY(error, hook, m); /* makes m NULL */ 465 466 release: 467 if (control != NULL) 468 m_freem(control); 469 if (m != NULL) 470 m_freem(m); 471 return (error); 472 } 473 474 static int 475 ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 476 { 477 struct ngpcb *const pcbp = sotongpcb(so); 478 479 if (pcbp == 0) 480 return (EINVAL); 481 return (ng_connect_data(nam, pcbp)); 482 } 483 484 /* 485 * Used for both data and control sockets 486 */ 487 static int 488 ng_setsockaddr(struct socket *so, struct sockaddr **addr) 489 { 490 struct ngpcb *pcbp; 491 struct sockaddr_ng *sg; 492 int sg_len, namelen, s; 493 494 /* Why isn't sg_data a `char[1]' ? :-( */ 495 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1; 496 497 s = splnet(); 498 pcbp = sotongpcb(so); 499 if ((pcbp == NULL) || (pcbp->sockdata == NULL)) { 500 splx(s); 501 return (EINVAL); 502 } 503 504 namelen = 0; /* silence compiler ! */ 505 if ( NG_NODE_HAS_NAME(pcbp->sockdata->node)) 506 sg_len += namelen = strlen(NG_NODE_NAME(pcbp->sockdata->node)); 507 508 MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK | M_ZERO); 509 510 if (NG_NODE_HAS_NAME(pcbp->sockdata->node)) 511 bcopy(NG_NODE_NAME(pcbp->sockdata->node), sg->sg_data, namelen); 512 splx(s); 513 514 sg->sg_len = sg_len; 515 sg->sg_family = AF_NETGRAPH; 516 *addr = (struct sockaddr *)sg; 517 518 return (0); 519 } 520 521 /* 522 * Attach a socket to it's protocol specific partner. 523 * For a control socket, actually create a netgraph node and attach 524 * to it as well. 525 */ 526 527 static int 528 ng_attach_cntl(struct socket *so) 529 { 530 struct ngsock *privdata; 531 struct ngpcb *pcbp; 532 int error; 533 534 /* Setup protocol control block */ 535 if ((error = ng_attach_common(so, NG_CONTROL)) != 0) 536 return (error); 537 pcbp = sotongpcb(so); 538 539 /* Allocate node private info */ 540 MALLOC(privdata, struct ngsock *, 541 sizeof(*privdata), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO); 542 if (privdata == NULL) { 543 ng_detach_common(NULL, NULL, pcbp, NG_CONTROL); 544 return (ENOMEM); 545 } 546 547 /* Make the generic node components */ 548 if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) { 549 FREE(privdata, M_NETGRAPH_SOCK); 550 ng_detach_common(NULL, NULL, pcbp, NG_CONTROL); 551 return (error); 552 } 553 NG_NODE_SET_PRIVATE(privdata->node, privdata); 554 555 /* Link the pcb and the node private data */ 556 privdata->ctlsock = pcbp; 557 pcbp->sockdata = privdata; 558 privdata->refs++; 559 return (0); 560 } 561 562 static int 563 ng_attach_data(struct socket *so) 564 { 565 return(ng_attach_common(so, NG_DATA)); 566 } 567 568 /* 569 * Set up a socket protocol control block. 570 * This code is shared between control and data sockets. 571 */ 572 static int 573 ng_attach_common(struct socket *so, int type) 574 { 575 struct ngpcb *pcbp; 576 int error; 577 578 /* Standard socket setup stuff */ 579 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace); 580 if (error) 581 return (error); 582 583 /* Allocate the pcb */ 584 MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO); 585 if (pcbp == NULL) 586 return (ENOMEM); 587 pcbp->type = type; 588 589 /* Link the pcb and the socket */ 590 so->so_pcb = (caddr_t) pcbp; 591 pcbp->ng_socket = so; 592 593 /* Add the socket to linked list */ 594 mtx_lock(&ngsocketlist_mtx); 595 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks); 596 mtx_unlock(&ngsocketlist_mtx); 597 return (0); 598 } 599 600 /* 601 * Disassociate the socket from it's protocol specific 602 * partner. If it's attached to a node's private data structure, 603 * then unlink from that too. If we were the last socket attached to it, 604 * then shut down the entire node. Shared code for control and data sockets. 605 */ 606 static void 607 ng_detach_common(node_p node, hook_p hook, void *arg1, int which) 608 { 609 struct ngpcb *pcbp = arg1; 610 611 if (pcbp->sockdata) { 612 struct ngsock *priv; 613 614 priv = pcbp->sockdata; 615 pcbp->sockdata = NULL; 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 if ((--priv->refs == 0) && (priv->node != NULL)) 627 ng_rmnode_self(priv->node); 628 } 629 pcbp->ng_socket->so_pcb = NULL; 630 pcbp->ng_socket = NULL; 631 mtx_lock(&ngsocketlist_mtx); 632 LIST_REMOVE(pcbp, socks); 633 mtx_unlock(&ngsocketlist_mtx); 634 FREE(pcbp, M_PCB); 635 } 636 637 #ifdef NOTYET 638 /* 639 * File descriptors can be passed into an AF_NETGRAPH socket. 640 * Note, that file descriptors cannot be passed OUT. 641 * Only character device descriptors are accepted. 642 * Character devices are useful to connect a graph to a device, 643 * which after all is the purpose of this whole system. 644 */ 645 static int 646 ng_internalize(struct mbuf *control, struct thread *td) 647 { 648 const struct cmsghdr *cm = mtod(control, const struct cmsghdr *); 649 struct file *fp; 650 struct vnode *vn; 651 int oldfds; 652 int fd; 653 654 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || 655 cm->cmsg_len != control->m_len) { 656 TRAP_ERROR; 657 return (EINVAL); 658 } 659 660 /* Check there is only one FD. XXX what would more than one signify? */ 661 oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int); 662 if (oldfds != 1) { 663 TRAP_ERROR; 664 return (EINVAL); 665 } 666 667 /* Check that the FD given is legit. and change it to a pointer to a 668 * struct file. */ 669 fd = CMSG_DATA(cm); 670 if ((error = fget(td, fd, &fp)) != 0) 671 return (error); 672 673 /* Depending on what kind of resource it is, act differently. For 674 * devices, we treat it as a file. For an AF_NETGRAPH socket, 675 * shortcut straight to the node. */ 676 switch (fp->f_type) { 677 case DTYPE_VNODE: 678 vn = fp->f_data; 679 if (vn && (vn->v_type == VCHR)) { 680 /* for a VCHR, actually reference the FILE */ 681 fp->f_count++; 682 /* XXX then what :) */ 683 /* how to pass on to other modules? */ 684 } else { 685 fdrop(fp, td); 686 TRAP_ERROR; 687 return (EINVAL); 688 } 689 break; 690 default: 691 fdrop(fp, td); 692 TRAP_ERROR; 693 return (EINVAL); 694 } 695 fdrop(fp, td); 696 return (0); 697 } 698 #endif /* NOTYET */ 699 700 /* 701 * Connect the data socket to a named control socket node. 702 */ 703 static int 704 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp) 705 { 706 struct sockaddr_ng *sap; 707 node_p farnode; 708 struct ngsock *priv; 709 int error; 710 item_p item; 711 712 /* If we are already connected, don't do it again */ 713 if (pcbp->sockdata != NULL) 714 return (EISCONN); 715 716 /* Find the target (victim) and check it doesn't already have a data 717 * socket. Also check it is a 'socket' type node. 718 * Use ng_package_data() and address_path() to do this. 719 */ 720 721 sap = (struct sockaddr_ng *) nam; 722 /* The item will hold the node reference */ 723 item = ng_package_data(NULL, NG_WAITOK); 724 if (item == NULL) { 725 return (ENOMEM); 726 } 727 if ((error = ng_address_path(NULL, item, sap->sg_data, 0))) 728 return (error); /* item is freed on failure */ 729 730 /* 731 * Extract node from item and free item. Remember we now have 732 * a reference on the node. The item holds it for us. 733 * when we free the item we release the reference. 734 */ 735 farnode = item->el_dest; /* shortcut */ 736 if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) { 737 NG_FREE_ITEM(item); /* drop the reference to the node */ 738 return (EINVAL); 739 } 740 priv = NG_NODE_PRIVATE(farnode); 741 if (priv->datasock != NULL) { 742 NG_FREE_ITEM(item); /* drop the reference to the node */ 743 return (EADDRINUSE); 744 } 745 746 /* 747 * Link the PCB and the private data struct. and note the extra 748 * reference. Drop the extra reference on the node. 749 */ 750 priv->datasock = pcbp; 751 pcbp->sockdata = priv; 752 priv->refs++; /* XXX possible race if it's being freed */ 753 NG_FREE_ITEM(item); /* drop the reference to the node */ 754 return (0); 755 } 756 757 /* 758 * Binding a socket means giving the corresponding node a name 759 */ 760 static int 761 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp) 762 { 763 struct ngsock *const priv = pcbp->sockdata; 764 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam; 765 766 if (priv == NULL) { 767 TRAP_ERROR; 768 return (EINVAL); 769 } 770 if ((sap->sg_len < 4) 771 || (sap->sg_len > (NG_NODESIZ + 2)) 772 || (sap->sg_data[0] == '\0') 773 || (sap->sg_data[sap->sg_len - 3] != '\0')) { 774 TRAP_ERROR; 775 return (EINVAL); 776 } 777 return (ng_name_node(priv->node, sap->sg_data)); 778 } 779 780 /* 781 * Take a message and pass it up to the control socket associated 782 * with the node. 783 */ 784 static int 785 ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr) 786 { 787 struct socket *const so = pcbp->ng_socket; 788 struct mbuf *mdata; 789 int msglen; 790 791 /* Copy the message itself into an mbuf chain */ 792 msglen = sizeof(struct ng_mesg) + msg->header.arglen; 793 mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL); 794 795 /* Here we free the message, as we are the end of the line. 796 * We need to do that regardless of whether we got mbufs. */ 797 NG_FREE_MSG(msg); 798 799 if (mdata == NULL) { 800 TRAP_ERROR; 801 return (ENOBUFS); 802 } 803 804 /* Send it up to the socket */ 805 if (sbappendaddr(&so->so_rcv, 806 (struct sockaddr *) addr, mdata, NULL) == 0) { 807 TRAP_ERROR; 808 m_freem(mdata); 809 return (ENOBUFS); 810 } 811 sorwakeup(so); 812 return (0); 813 } 814 815 /* 816 * You can only create new nodes from the socket end of things. 817 */ 818 static int 819 ngs_constructor(node_p nodep) 820 { 821 return (EINVAL); 822 } 823 824 /* 825 * We allow any hook to be connected to the node. 826 * There is no per-hook private information though. 827 */ 828 static int 829 ngs_newhook(node_p node, hook_p hook, const char *name) 830 { 831 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node)); 832 return (0); 833 } 834 835 /* 836 * if only one hook, allow read(2) and write(2) to work. 837 */ 838 static int 839 ngs_connect(hook_p hook) 840 { 841 node_p node = NG_HOOK_NODE(hook); 842 struct ngsock *priv = NG_NODE_PRIVATE(node); 843 844 if ((priv->datasock) 845 && (priv->datasock->ng_socket)) { 846 if (NG_NODE_NUMHOOKS(node) == 1) { 847 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED; 848 } else { 849 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED; 850 } 851 } 852 return (0); 853 } 854 855 /* 856 * Incoming messages get passed up to the control socket. 857 * Unless they are for us specifically (socket_type) 858 */ 859 static int 860 ngs_rcvmsg(node_p node, item_p item, hook_p lasthook) 861 { 862 struct ngsock *const priv = NG_NODE_PRIVATE(node); 863 struct ngpcb *const pcbp = priv->ctlsock; 864 struct sockaddr_ng *addr; 865 int addrlen; 866 int error = 0; 867 struct ng_mesg *msg; 868 ng_ID_t retaddr = NGI_RETADDR(item); 869 char retabuf[32]; 870 871 NGI_GET_MSG(item, msg); 872 NG_FREE_ITEM(item); /* we have all we need */ 873 874 /* Only allow mesgs to be passed if we have the control socket. 875 * Data sockets can only support the generic messages. */ 876 if (pcbp == NULL) { 877 TRAP_ERROR; 878 return (EINVAL); 879 } 880 881 #ifdef TRACE_MESSAGES 882 printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n", 883 retaddr, 884 msg->header.typecookie, 885 msg->header.cmd, 886 msg->header.cmdstr, 887 msg->header.flags, 888 msg->header.token); 889 #endif 890 891 if (msg->header.typecookie == NGM_SOCKET_COOKIE) { 892 switch (msg->header.cmd) { 893 case NGM_SOCK_CMD_NOLINGER: 894 priv->flags |= NGS_FLAG_NOLINGER; 895 break; 896 case NGM_SOCK_CMD_LINGER: 897 priv->flags &= ~NGS_FLAG_NOLINGER; 898 break; 899 default: 900 error = EINVAL; /* unknown command */ 901 } 902 /* Free the message and return */ 903 NG_FREE_MSG(msg); 904 return(error); 905 906 } 907 /* Get the return address into a sockaddr */ 908 sprintf(retabuf,"[%x]:", retaddr); 909 addrlen = strlen(retabuf); 910 MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH_PATH, M_NOWAIT); 911 if (addr == NULL) { 912 TRAP_ERROR; 913 return (ENOMEM); 914 } 915 addr->sg_len = addrlen + 3; 916 addr->sg_family = AF_NETGRAPH; 917 bcopy(retabuf, addr->sg_data, addrlen); 918 addr->sg_data[addrlen] = '\0'; 919 920 /* Send it up */ 921 error = ship_msg(pcbp, msg, addr); 922 FREE(addr, M_NETGRAPH_PATH); 923 return (error); 924 } 925 926 /* 927 * Receive data on a hook 928 */ 929 static int 930 ngs_rcvdata(hook_p hook, item_p item) 931 { 932 struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 933 struct ngpcb *const pcbp = priv->datasock; 934 struct socket *so; 935 struct sockaddr_ng *addr; 936 char *addrbuf[NG_HOOKSIZ + 4]; 937 int addrlen; 938 struct mbuf *m; 939 940 NGI_GET_M(item, m); 941 NG_FREE_ITEM(item); 942 /* If there is no data socket, black-hole it */ 943 if (pcbp == NULL) { 944 NG_FREE_M(m); 945 return (0); 946 } 947 so = pcbp->ng_socket; 948 949 /* Get the return address into a sockaddr. */ 950 addrlen = strlen(NG_HOOK_NAME(hook)); /* <= NG_HOOKSIZ - 1 */ 951 addr = (struct sockaddr_ng *) addrbuf; 952 addr->sg_len = addrlen + 3; 953 addr->sg_family = AF_NETGRAPH; 954 bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen); 955 addr->sg_data[addrlen] = '\0'; 956 957 /* Try to tell the socket which hook it came in on */ 958 if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) { 959 m_freem(m); 960 TRAP_ERROR; 961 return (ENOBUFS); 962 } 963 sorwakeup(so); 964 return (0); 965 } 966 967 /* 968 * Hook disconnection 969 * 970 * For this type, removal of the last link destroys the node 971 * if the NOLINGER flag is set. 972 */ 973 static int 974 ngs_disconnect(hook_p hook) 975 { 976 node_p node = NG_HOOK_NODE(hook); 977 struct ngsock *const priv = NG_NODE_PRIVATE(node); 978 979 if ((priv->datasock) 980 && (priv->datasock->ng_socket)) { 981 if (NG_NODE_NUMHOOKS(node) == 1) { 982 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED; 983 } else { 984 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED; 985 } 986 } 987 988 if ((priv->flags & NGS_FLAG_NOLINGER ) 989 && (NG_NODE_NUMHOOKS(node) == 0) 990 && (NG_NODE_IS_VALID(node))) { 991 ng_rmnode_self(node); 992 } 993 return (0); 994 } 995 996 /* 997 * Do local shutdown processing. 998 * In this case, that involves making sure the socket 999 * knows we should be shutting down. 1000 */ 1001 static int 1002 ngs_shutdown(node_p node) 1003 { 1004 struct ngsock *const priv = NG_NODE_PRIVATE(node); 1005 struct ngpcb *const dpcbp = priv->datasock; 1006 struct ngpcb *const pcbp = priv->ctlsock; 1007 1008 if (dpcbp != NULL) { 1009 soisdisconnected(dpcbp->ng_socket); 1010 dpcbp->sockdata = NULL; 1011 priv->datasock = NULL; 1012 priv->refs--; 1013 } 1014 if (pcbp != NULL) { 1015 soisdisconnected(pcbp->ng_socket); 1016 pcbp->sockdata = NULL; 1017 priv->ctlsock = NULL; 1018 priv->refs--; 1019 } 1020 NG_NODE_SET_PRIVATE(node, NULL); 1021 NG_NODE_UNREF(node); 1022 FREE(priv, M_NETGRAPH_SOCK); 1023 return (0); 1024 } 1025 1026 static int 1027 dummy_disconnect(struct socket *so) 1028 { 1029 return (0); 1030 } 1031 /* 1032 * Control and data socket type descriptors 1033 */ 1034 1035 static struct pr_usrreqs ngc_usrreqs = { 1036 .pru_abort = NULL, 1037 .pru_attach = ngc_attach, 1038 .pru_bind = ngc_bind, 1039 .pru_connect = ngc_connect, 1040 .pru_detach = ngc_detach, 1041 .pru_disconnect = dummy_disconnect, 1042 .pru_peeraddr = NULL, 1043 .pru_send = ngc_send, 1044 .pru_shutdown = NULL, 1045 .pru_sockaddr = ng_setsockaddr, 1046 }; 1047 1048 static struct pr_usrreqs ngd_usrreqs = { 1049 .pru_abort = NULL, 1050 .pru_attach = ngd_attach, 1051 .pru_bind = NULL, 1052 .pru_connect = ngd_connect, 1053 .pru_detach = ngd_detach, 1054 .pru_disconnect = dummy_disconnect, 1055 .pru_peeraddr = NULL, 1056 .pru_send = ngd_send, 1057 .pru_shutdown = NULL, 1058 .pru_sockaddr ng_setsockaddr, 1059 }; 1060 1061 /* 1062 * Definitions of protocols supported in the NETGRAPH domain. 1063 */ 1064 1065 extern struct domain ngdomain; /* stop compiler warnings */ 1066 1067 static struct protosw ngsw[] = { 1068 { 1069 SOCK_DGRAM, /* protocol type */ 1070 &ngdomain, /* backpointer to domain */ 1071 NG_CONTROL, 1072 PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, /* flags */ 1073 0, 0, 0, 0, /* input, output, ctlinput, ctloutput */ 1074 NULL, /* ousrreq */ 1075 0, 0, 0, 0, /* init, fasttimeo, slowtimo, drain */ 1076 &ngc_usrreqs, /* usrreq table (above) */ 1077 /*{NULL}*/ /* pffh (protocol filter head?) */ 1078 }, 1079 { 1080 SOCK_DGRAM, /* protocol type */ 1081 &ngdomain, /* backpointer to domain */ 1082 NG_DATA, 1083 PR_ATOMIC | PR_ADDR, /* flags */ 1084 0, 0, 0, 0, /* input, output, ctlinput, ctloutput */ 1085 NULL, /* ousrreq() */ 1086 0, 0, 0, 0, /* init, fasttimeo, slowtimo, drain */ 1087 &ngd_usrreqs, /* usrreq table (above) */ 1088 /*{NULL}*/ /* pffh (protocol filter head?) */ 1089 } 1090 }; 1091 1092 struct domain ngdomain = { 1093 AF_NETGRAPH, 1094 "netgraph", 1095 NULL, /* init() */ 1096 NULL, /* externalise() */ 1097 NULL, /* dispose() */ 1098 ngsw, /* protosw entry */ 1099 &ngsw[sizeof(ngsw) / sizeof(ngsw[0])], /* Number of protosw entries */ 1100 NULL, /* next domain in list */ 1101 NULL, /* rtattach() */ 1102 0, /* arg to rtattach in bits */ 1103 0 /* maxrtkey */ 1104 }; 1105 1106 /* 1107 * Handle loading and unloading for this node type 1108 * This is to handle auxiliary linkages (e.g protocol domain addition). 1109 */ 1110 static int 1111 ngs_mod_event(module_t mod, int event, void *data) 1112 { 1113 int error = 0; 1114 1115 switch (event) { 1116 case MOD_LOAD: 1117 mtx_init(&ngsocketlist_mtx, "ng_socketlist", NULL, MTX_DEF); 1118 /* Register protocol domain */ 1119 net_add_domain(&ngdomain); 1120 break; 1121 case MOD_UNLOAD: 1122 /* Insure there are no open netgraph sockets */ 1123 if (!LIST_EMPTY(&ngsocklist)) { 1124 error = EBUSY; 1125 break; 1126 } 1127 1128 #ifdef NOTYET 1129 if ((LIST_EMPTY(&ngsocklist)) && (typestruct.refs == 0)) { 1130 /* Unregister protocol domain XXX can't do this yet.. */ 1131 if ((error = net_rm_domain(&ngdomain)) != 0) 1132 break; 1133 mtx_destroy(&ngsocketlist_mtx); 1134 } else 1135 #endif 1136 error = EBUSY; 1137 break; 1138 default: 1139 error = EOPNOTSUPP; 1140 break; 1141 } 1142 return (error); 1143 } 1144 1145 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, ""); 1146 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA"); 1147 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, ""); 1148 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL"); 1149 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, ""); 1150 1151