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: src/sys/netgraph/ng_socket.c,v 1.85 2008/03/11 21:58:48 mav Exp $ 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/domain.h> 53 #include <sys/kernel.h> 54 #include <sys/linker.h> 55 #include <sys/lock.h> 56 #include <sys/malloc.h> 57 #include <sys/mbuf.h> 58 #include <sys/msgport2.h> 59 /* 60 #include <sys/mutex.h> 61 */ 62 #include <sys/param.h> 63 #include <sys/priv.h> 64 #include <sys/proc.h> 65 #include <sys/protosw.h> 66 #include <sys/queue.h> 67 #include <sys/socket.h> 68 #include <sys/socketvar.h> 69 #include <sys/socketvar2.h> 70 /* 71 #include <sys/syscallsubr.h> 72 */ 73 #include <sys/sysctl.h> 74 #include <sys/thread2.h> 75 #ifdef NOTYET 76 #include <sys/vnode.h> 77 #endif 78 #include <netgraph7/ng_message.h> 79 #include <netgraph7/netgraph.h> 80 #include "ng_socketvar.h" 81 #include "ng_socket.h" 82 83 #ifdef NG_SEPARATE_MALLOC 84 MALLOC_DEFINE(M_NETGRAPH_PATH, "netgraph_path", "netgraph path info "); 85 MALLOC_DEFINE(M_NETGRAPH_SOCK, "netgraph_sock", "netgraph socket info "); 86 #else 87 #define M_NETGRAPH_PATH M_NETGRAPH 88 #define M_NETGRAPH_SOCK M_NETGRAPH 89 #endif 90 91 /* 92 * It's Ascii-art time! 93 * +-------------+ +-------------+ 94 * |socket (ctl)| |socket (data)| 95 * +-------------+ +-------------+ 96 * ^ ^ 97 * | | 98 * v v 99 * +-----------+ +-----------+ 100 * |pcb (ctl)| |pcb (data)| 101 * +-----------+ +-----------+ 102 * ^ ^ 103 * | | 104 * v v 105 * +--------------------------+ 106 * | Socket type private | 107 * | data | 108 * +--------------------------+ 109 * ^ 110 * | 111 * v 112 * +----------------+ 113 * | struct ng_node | 114 * +----------------+ 115 */ 116 117 /* Netgraph node methods */ 118 static ng_constructor_t ngs_constructor; 119 static ng_rcvmsg_t ngs_rcvmsg; 120 static ng_shutdown_t ngs_shutdown; 121 static ng_newhook_t ngs_newhook; 122 static ng_connect_t ngs_connect; 123 static ng_rcvdata_t ngs_rcvdata; 124 static ng_disconnect_t ngs_disconnect; 125 126 /* Internal methods */ 127 static int ng_attach_data(struct socket *so); 128 static int ng_attach_cntl(struct socket *so); 129 static int ng_attach_common(struct socket *so, int type); 130 static void ng_detach_common(struct ngpcb *pcbp, int type); 131 static void ng_socket_free_priv(struct ngsock *priv); 132 #ifdef NOTYET 133 static int ng_internalize(struct mbuf *m, struct thread *p); 134 #endif 135 static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp); 136 static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp); 137 138 static int ngs_mod_event(module_t mod, int event, void *data); 139 static void ng_socket_item_applied(void *context, int error); 140 141 /* Netgraph type descriptor */ 142 static struct ng_type typestruct = { 143 .version = NG_ABI_VERSION, 144 .name = NG_SOCKET_NODE_TYPE, 145 .mod_event = ngs_mod_event, 146 .constructor = ngs_constructor, 147 .rcvmsg = ngs_rcvmsg, 148 .shutdown = ngs_shutdown, 149 .newhook = ngs_newhook, 150 .connect = ngs_connect, 151 .rcvdata = ngs_rcvdata, 152 .disconnect = ngs_disconnect, 153 }; 154 NETGRAPH_INIT_ORDERED(socket, &typestruct, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 155 156 /* Buffer space */ 157 static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */ 158 SYSCTL_INT(_net_graph, OID_AUTO, maxdgram, CTLFLAG_RW, 159 &ngpdg_sendspace , 0, "Maximum outgoing Netgraph datagram size"); 160 static u_long ngpdg_recvspace = 20 * 1024; 161 SYSCTL_INT(_net_graph, OID_AUTO, recvspace, CTLFLAG_RW, 162 &ngpdg_recvspace , 0, "Maximum space for incoming Netgraph datagrams"); 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 void 176 ngc_attach(netmsg_t msg) 177 { 178 struct socket *so = msg->attach.base.nm_so; 179 struct pru_attach_info *ai = msg->attach.nm_ai; 180 struct ngpcb *const pcbp = sotongpcb(so); 181 int error; 182 183 if (priv_check_cred(ai->p_ucred, PRIV_ROOT, NULL_CRED_OKAY) != 0) 184 error = EPERM; 185 else if (pcbp != NULL) 186 error = EISCONN; 187 else 188 error = ng_attach_cntl(so); 189 lwkt_replymsg(&msg->attach.base.lmsg, error); 190 } 191 192 static void 193 ngc_detach(netmsg_t msg) 194 { 195 struct socket *so = msg->detach.base.nm_so; 196 struct ngpcb *const pcbp = sotongpcb(so); 197 198 KASSERT(pcbp != NULL, ("ngc_detach: pcbp == NULL")); 199 ng_detach_common(pcbp, NG_CONTROL); 200 lwkt_replymsg(&msg->detach.base.lmsg, 0); 201 } 202 203 static void 204 ngc_send(netmsg_t netmsg) 205 { 206 struct socket *so = netmsg->send.base.nm_so; 207 struct mbuf *m = netmsg->send.nm_m; 208 struct sockaddr *addr = netmsg->send.nm_addr; 209 struct mbuf *control = netmsg->send.nm_control; 210 struct ngpcb *const pcbp = sotongpcb(so); 211 struct ngsock *const priv = NG_NODE_PRIVATE(pcbp->sockdata->node); 212 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 213 struct ng_mesg *msg; 214 struct mbuf *m0; 215 item_p item; 216 char *path = NULL; 217 int len, error = 0; 218 struct ng_apply_info apply; 219 220 #ifdef NOTYET 221 if (control && (error = ng_internalize(control, td))) { 222 if (pcbp->sockdata == NULL) { 223 error = ENOTCONN; 224 goto release; 225 } 226 } 227 #else /* NOTYET */ 228 if (control) { 229 error = EINVAL; 230 goto release; 231 } 232 #endif /* NOTYET */ 233 234 /* Require destination as there may be >= 1 hooks on this node. */ 235 if (addr == NULL) { 236 error = EDESTADDRREQ; 237 goto release; 238 } 239 240 /* 241 * Allocate an expendable buffer for the path, chop off 242 * the sockaddr header, and make sure it's NUL terminated. 243 */ 244 len = sap->sg_len - 2; 245 path = kmalloc(len + 1, M_NETGRAPH_PATH, M_WAITOK); 246 bcopy(sap->sg_data, path, len); 247 path[len] = '\0'; 248 249 /* 250 * Move the actual message out of mbufs into a linear buffer. 251 * Start by adding up the size of the data. (could use mh_len?) 252 */ 253 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next) 254 len += m0->m_len; 255 256 /* 257 * Move the data into a linear buffer as well. 258 * Messages are not delivered in mbufs. 259 */ 260 msg = kmalloc(len + 1, M_NETGRAPH_MSG, M_WAITOK); 261 m_copydata(m, 0, len, (char *)msg); 262 263 if (msg->header.version != NG_VERSION) { 264 kfree(msg, M_NETGRAPH_MSG); 265 error = EINVAL; 266 goto release; 267 } 268 269 /* 270 * Hack alert! 271 * We look into the message and if it mkpeers a node of unknown type, we 272 * try to load it. We need to do this now, in syscall thread, because if 273 * message gets queued and applied later we will get panic. 274 */ 275 if (msg->header.typecookie == NGM_GENERIC_COOKIE && 276 msg->header.cmd == NGM_MKPEER) { 277 struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data; 278 struct ng_type *type; 279 280 if ((type = ng_findtype(mkp->type)) == NULL) { 281 char filename[NG_TYPESIZ + 3]; 282 linker_file_t fileid; 283 284 if (!linker_api_available()) { 285 error = ENXIO; 286 goto done; 287 } 288 289 /* Not found, try to load it as a loadable module. */ 290 snprintf(filename, sizeof(filename), "ng_%s.ko", 291 mkp->type); 292 error = linker_load_file(filename, &fileid); 293 if (error != 0) { 294 kfree(msg, M_NETGRAPH_MSG); 295 goto release; 296 } 297 298 /* See if type has been loaded successfully. */ 299 if ((type = ng_findtype(mkp->type)) == NULL) { 300 kfree(msg, M_NETGRAPH_MSG); 301 (void)linker_file_unload(fileid); 302 error = ENXIO; 303 goto release; 304 } 305 } 306 } 307 308 item = ng_package_msg(msg, NG_WAITOK); 309 if ((error = ng_address_path((pcbp->sockdata->node), item, path, 0)) 310 != 0) { 311 #ifdef TRACE_MESSAGES 312 printf("ng_address_path: errx=%d\n", error); 313 #endif 314 goto release; 315 } 316 317 #ifdef TRACE_MESSAGES 318 printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n", 319 item->el_dest->nd_ID, 320 msg->header.typecookie, 321 msg->header.cmd, 322 msg->header.cmdstr, 323 msg->header.flags, 324 msg->header.token, 325 item->el_dest->nd_type->name); 326 #endif 327 SAVE_LINE(item); 328 /* 329 * We do not want to return from syscall until the item 330 * is processed by destination node. We register callback 331 * on the item, which will update priv->error when item 332 * was applied. 333 * If ng_snd_item() has queued item, we sleep until 334 * callback wakes us up. 335 */ 336 bzero(&apply, sizeof(apply)); 337 apply.apply = ng_socket_item_applied; 338 apply.context = priv; 339 item->apply = &apply; 340 priv->error = -1; 341 342 error = ng_snd_item(item, 0); 343 344 mtx_lock(&priv->mtx); 345 if (priv->error == -1) 346 lock_sleep(priv, 0, "ngsock", 0, 347 (struct lock *)&priv->mtx); 348 mtx_unlock(&priv->mtx); 349 KASSERT(priv->error != -1, 350 ("ng_socket: priv->error wasn't updated")); 351 error = priv->error; 352 353 release: 354 if (path != NULL) 355 kfree(path, M_NETGRAPH_PATH); 356 if (control != NULL) 357 m_freem(control); 358 if (m != NULL) 359 m_freem(m); 360 done: 361 lwkt_replymsg(&netmsg->send.base.lmsg, error); 362 } 363 364 static void 365 ngc_bind(netmsg_t msg) 366 { 367 struct socket *so = msg->connect.base.nm_so; 368 struct sockaddr *nam = msg->connect.nm_nam; 369 struct ngpcb *const pcbp = sotongpcb(so); 370 int error; 371 372 if (pcbp == NULL) 373 error = EINVAL; 374 else 375 error = ng_bind(nam, pcbp); 376 lwkt_replymsg(&msg->connect.base.lmsg, error); 377 } 378 379 static void 380 ngc_connect(netmsg_t msg) 381 { 382 /* 383 * At this time refuse to do this.. it used to 384 * do something but it was undocumented and not used. 385 */ 386 printf("program tried to connect control socket to remote node\n"); 387 lwkt_replymsg(&msg->connect.base.lmsg, EINVAL); 388 } 389 390 /*************************************************************** 391 Data sockets 392 ***************************************************************/ 393 394 static void 395 ngd_attach(netmsg_t msg) 396 { 397 struct socket *so = msg->attach.base.nm_so; 398 struct ngpcb *const pcbp = sotongpcb(so); 399 int error; 400 401 if (pcbp != NULL) 402 error = EISCONN; 403 else 404 error = ng_attach_data(so); 405 lwkt_replymsg(&msg->connect.base.lmsg, error); 406 } 407 408 static void 409 ngd_detach(netmsg_t msg) 410 { 411 struct socket *so = msg->detach.base.nm_so; 412 struct ngpcb *const pcbp = sotongpcb(so); 413 414 KASSERT(pcbp != NULL, ("ngd_detach: pcbp == NULL")); 415 ng_detach_common(pcbp, NG_DATA); 416 lwkt_replymsg(&msg->detach.base.lmsg, 0); 417 } 418 419 static void 420 ngd_send(netmsg_t msg) 421 { 422 struct socket *so = msg->send.base.nm_so; 423 struct mbuf *m = msg->send.nm_m; 424 struct sockaddr *addr = msg->send.nm_addr; 425 struct mbuf *control = msg->send.nm_control; 426 struct ngpcb *const pcbp = sotongpcb(so); 427 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 428 int len, error; 429 hook_p hook = NULL; 430 char hookname[NG_HOOKSIZ]; 431 432 if ((pcbp == NULL) || (control != NULL)) { 433 error = EINVAL; 434 goto release; 435 } 436 if (pcbp->sockdata == NULL) { 437 error = ENOTCONN; 438 goto release; 439 } 440 441 if (sap == NULL) 442 len = 0; /* Make compiler happy. */ 443 else 444 len = sap->sg_len - 2; 445 446 /* 447 * If the user used any of these ways to not specify an address 448 * then handle specially. 449 */ 450 if ((sap == NULL) || (len <= 0) || (*sap->sg_data == '\0')) { 451 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) { 452 error = EDESTADDRREQ; 453 goto release; 454 } 455 /* 456 * If exactly one hook exists, just use it. 457 * Special case to allow write(2) to work on an ng_socket. 458 */ 459 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks); 460 } else { 461 if (len >= NG_HOOKSIZ) { 462 error = EINVAL; 463 goto release; 464 } 465 466 /* 467 * chop off the sockaddr header, and make sure it's NUL 468 * terminated 469 */ 470 bcopy(sap->sg_data, hookname, len); 471 hookname[len] = '\0'; 472 473 /* Find the correct hook from 'hookname' */ 474 hook = ng_findhook(pcbp->sockdata->node, hookname); 475 if (hook == NULL) { 476 error = EHOSTUNREACH; 477 goto release; 478 } 479 } 480 481 /* Send data. */ 482 NG_SEND_DATA_FLAGS(error, hook, m, NG_WAITOK); 483 484 release: 485 if (control != NULL) 486 m_freem(control); 487 if (m != NULL) 488 m_freem(m); 489 lwkt_replymsg(&msg->send.base.lmsg, error); 490 } 491 492 static void 493 ngd_connect(netmsg_t msg) 494 { 495 struct socket *so = msg->connect.base.nm_so; 496 struct sockaddr *nam = msg->connect.nm_nam; 497 struct ngpcb *const pcbp = sotongpcb(so); 498 int error; 499 500 if (pcbp == NULL) 501 error = EINVAL; 502 else 503 error = ng_connect_data(nam, pcbp); 504 lwkt_replymsg(&msg->connect.base.lmsg, error); 505 } 506 507 /* 508 * Used for both data and control sockets 509 */ 510 static void 511 ng_getsockaddr(netmsg_t msg) 512 { 513 struct socket *so = msg->sockaddr.base.nm_so; 514 struct sockaddr **addr = msg->sockaddr.nm_nam; 515 struct ngpcb *pcbp; 516 struct sockaddr_ng *sg; 517 int sg_len; 518 int error = 0; 519 520 /* Why isn't sg_data a `char[1]' ? :-( */ 521 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1; 522 523 pcbp = sotongpcb(so); 524 if ((pcbp == NULL) || (pcbp->sockdata == NULL)) { 525 /* XXXGL: can this still happen? */ 526 error = EINVAL; 527 goto replymsg; 528 } 529 530 mtx_lock(&pcbp->sockdata->mtx); 531 if (pcbp->sockdata->node != NULL) { 532 node_p node = pcbp->sockdata->node; 533 int namelen = 0; /* silence compiler! */ 534 535 if (NG_NODE_HAS_NAME(node)) 536 sg_len += namelen = strlen(NG_NODE_NAME(node)); 537 538 sg = kmalloc(sg_len, M_SONAME, M_WAITOK | M_ZERO); 539 540 if (NG_NODE_HAS_NAME(node)) 541 bcopy(NG_NODE_NAME(node), sg->sg_data, namelen); 542 543 sg->sg_len = sg_len; 544 sg->sg_family = AF_NETGRAPH; 545 *addr = (struct sockaddr *)sg; 546 mtx_unlock(&pcbp->sockdata->mtx); 547 } else { 548 mtx_unlock(&pcbp->sockdata->mtx); 549 error = EINVAL; 550 } 551 552 replymsg: 553 lwkt_replymsg(&msg->sockaddr.base.lmsg, error); 554 } 555 556 /* 557 * Attach a socket to it's protocol specific partner. 558 * For a control socket, actually create a netgraph node and attach 559 * to it as well. 560 */ 561 562 static int 563 ng_attach_cntl(struct socket *so) 564 { 565 struct ngsock *priv; 566 struct ngpcb *pcbp; 567 int error; 568 569 /* Allocate node private info */ 570 priv = kmalloc(sizeof(*priv), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO); 571 572 /* Setup protocol control block */ 573 if ((error = ng_attach_common(so, NG_CONTROL)) != 0) { 574 kfree(priv, M_NETGRAPH_SOCK); 575 return (error); 576 } 577 pcbp = sotongpcb(so); 578 579 /* Link the pcb the private data. */ 580 priv->ctlsock = pcbp; 581 pcbp->sockdata = priv; 582 priv->refs++; 583 584 /* Initialize mutex. */ 585 mtx_init(&priv->mtx, "ng_socket", NULL, MTX_DEF); 586 587 /* Make the generic node components */ 588 if ((error = ng_make_node_common(&typestruct, &priv->node)) != 0) { 589 kfree(priv, M_NETGRAPH_SOCK); 590 ng_detach_common(pcbp, NG_CONTROL); 591 return (error); 592 } 593 594 /* Link the node and the private data. */ 595 NG_NODE_SET_PRIVATE(priv->node, priv); 596 NG_NODE_REF(priv->node); 597 priv->refs++; 598 599 return (0); 600 } 601 602 static int 603 ng_attach_data(struct socket *so) 604 { 605 return (ng_attach_common(so, NG_DATA)); 606 } 607 608 /* 609 * Set up a socket protocol control block. 610 * This code is shared between control and data sockets. 611 */ 612 static int 613 ng_attach_common(struct socket *so, int type) 614 { 615 struct ngpcb *pcbp; 616 int error; 617 618 /* Standard socket setup stuff. */ 619 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace, NULL); 620 if (error) 621 return (error); 622 623 /* Allocate the pcb. */ 624 pcbp = kmalloc(sizeof(struct ngpcb), M_PCB, M_WAITOK | M_ZERO); 625 pcbp->type = type; 626 627 /* Link the pcb and the socket. */ 628 so->so_pcb = (caddr_t)pcbp; 629 pcbp->ng_socket = so; 630 631 return (0); 632 } 633 634 /* 635 * Disassociate the socket from it's protocol specific 636 * partner. If it's attached to a node's private data structure, 637 * then unlink from that too. If we were the last socket attached to it, 638 * then shut down the entire node. Shared code for control and data sockets. 639 */ 640 static void 641 ng_detach_common(struct ngpcb *pcbp, int which) 642 { 643 struct ngsock *priv = pcbp->sockdata; 644 645 if (priv != NULL) { 646 mtx_lock(&priv->mtx); 647 648 switch (which) { 649 case NG_CONTROL: 650 priv->ctlsock = NULL; 651 break; 652 case NG_DATA: 653 priv->datasock = NULL; 654 break; 655 default: 656 panic(__func__); 657 } 658 pcbp->sockdata = NULL; 659 660 ng_socket_free_priv(priv); 661 } 662 663 pcbp->ng_socket->so_pcb = NULL; 664 kfree(pcbp, M_PCB); 665 } 666 667 /* 668 * Remove a reference from node private data. 669 */ 670 static void 671 ng_socket_free_priv(struct ngsock *priv) 672 { 673 mtx_assert(&priv->mtx, MA_OWNED); 674 675 priv->refs--; 676 677 if (priv->refs == 0) { 678 mtx_destroy(&priv->mtx); 679 kfree(priv, M_NETGRAPH_SOCK); 680 return; 681 } 682 683 if ((priv->refs == 1) && (priv->node != NULL)) { 684 node_p node = priv->node; 685 686 priv->node = NULL; 687 mtx_unlock(&priv->mtx); 688 NG_NODE_UNREF(node); 689 ng_rmnode_self(node); 690 } else 691 mtx_unlock(&priv->mtx); 692 } 693 694 #ifdef NOTYET 695 /* 696 * File descriptors can be passed into an AF_NETGRAPH socket. 697 * Note, that file descriptors cannot be passed OUT. 698 * Only character device descriptors are accepted. 699 * Character devices are useful to connect a graph to a device, 700 * which after all is the purpose of this whole system. 701 */ 702 static int 703 ng_internalize(struct mbuf *control, struct thread *td) 704 { 705 const struct cmsghdr *cm = mtod(control, const struct cmsghdr *); 706 struct file *fp; 707 struct vnode *vn; 708 int oldfds; 709 int fd; 710 711 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || 712 cm->cmsg_len != control->m_len) { 713 TRAP_ERROR; 714 return (EINVAL); 715 } 716 717 /* Check there is only one FD. XXX what would more than one signify? */ 718 oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int); 719 if (oldfds != 1) { 720 TRAP_ERROR; 721 return (EINVAL); 722 } 723 724 /* Check that the FD given is legit. and change it to a pointer to a 725 * struct file. */ 726 fd = CMSG_DATA(cm); 727 if ((error = fget(td, fd, &fp)) != 0) 728 return (error); 729 730 /* Depending on what kind of resource it is, act differently. For 731 * devices, we treat it as a file. For an AF_NETGRAPH socket, 732 * shortcut straight to the node. */ 733 switch (fp->f_type) { 734 case DTYPE_VNODE: 735 vn = fp->f_data; 736 if (vn && (vn->v_type == VCHR)) { 737 /* for a VCHR, actually reference the FILE */ 738 fhold(fp); 739 /* XXX then what :) */ 740 /* how to pass on to other modules? */ 741 } else { 742 fdrop(fp, td); 743 TRAP_ERROR; 744 return (EINVAL); 745 } 746 break; 747 default: 748 fdrop(fp, td); 749 TRAP_ERROR; 750 return (EINVAL); 751 } 752 fdrop(fp, td); 753 return (0); 754 } 755 #endif /* NOTYET */ 756 757 /* 758 * Connect the data socket to a named control socket node. 759 */ 760 static int 761 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp) 762 { 763 struct sockaddr_ng *sap; 764 node_p farnode; 765 struct ngsock *priv; 766 int error; 767 item_p item; 768 769 /* If we are already connected, don't do it again. */ 770 if (pcbp->sockdata != NULL) 771 return (EISCONN); 772 773 /* 774 * Find the target (victim) and check it doesn't already have 775 * a data socket. Also check it is a 'socket' type node. 776 * Use ng_package_data() and ng_address_path() to do this. 777 */ 778 779 sap = (struct sockaddr_ng *) nam; 780 /* The item will hold the node reference. */ 781 item = ng_package_data(NULL, NG_WAITOK); 782 783 if ((error = ng_address_path(NULL, item, sap->sg_data, 0))) 784 return (error); /* item is freed on failure */ 785 786 /* 787 * Extract node from item and free item. Remember we now have 788 * a reference on the node. The item holds it for us. 789 * when we free the item we release the reference. 790 */ 791 farnode = item->el_dest; /* shortcut */ 792 if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) { 793 NG_FREE_ITEM(item); /* drop the reference to the node */ 794 return (EINVAL); 795 } 796 priv = NG_NODE_PRIVATE(farnode); 797 if (priv->datasock != NULL) { 798 NG_FREE_ITEM(item); /* drop the reference to the node */ 799 return (EADDRINUSE); 800 } 801 802 /* 803 * Link the PCB and the private data struct. and note the extra 804 * reference. Drop the extra reference on the node. 805 */ 806 mtx_lock(&priv->mtx); 807 priv->datasock = pcbp; 808 pcbp->sockdata = priv; 809 priv->refs++; 810 mtx_unlock(&priv->mtx); 811 NG_FREE_ITEM(item); /* drop the reference to the node */ 812 return (0); 813 } 814 815 /* 816 * Binding a socket means giving the corresponding node a name 817 */ 818 static int 819 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp) 820 { 821 struct ngsock *const priv = pcbp->sockdata; 822 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam; 823 824 if (priv == NULL) { 825 TRAP_ERROR; 826 return (EINVAL); 827 } 828 if ((sap->sg_len < 4) || (sap->sg_len > (NG_NODESIZ + 2)) || 829 (sap->sg_data[0] == '\0') || 830 (sap->sg_data[sap->sg_len - 3] != '\0')) { 831 TRAP_ERROR; 832 return (EINVAL); 833 } 834 return (ng_name_node(priv->node, sap->sg_data)); 835 } 836 837 /*************************************************************** 838 Netgraph node 839 ***************************************************************/ 840 841 /* 842 * You can only create new nodes from the socket end of things. 843 */ 844 static int 845 ngs_constructor(node_p nodep) 846 { 847 return (EINVAL); 848 } 849 850 /* 851 * We allow any hook to be connected to the node. 852 * There is no per-hook private information though. 853 */ 854 static int 855 ngs_newhook(node_p node, hook_p hook, const char *name) 856 { 857 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node)); 858 return (0); 859 } 860 861 /* 862 * If only one hook, allow read(2) and write(2) to work. 863 */ 864 static int 865 ngs_connect(hook_p hook) 866 { 867 node_p node = NG_HOOK_NODE(hook); 868 struct ngsock *priv = NG_NODE_PRIVATE(node); 869 870 if ((priv->datasock) && (priv->datasock->ng_socket)) { 871 if (NG_NODE_NUMHOOKS(node) == 1) 872 sosetstate(priv->datasock->ng_socket, SS_ISCONNECTED); 873 else 874 soclrstate(priv->datasock->ng_socket, SS_ISCONNECTED); 875 } 876 return (0); 877 } 878 879 /* 880 * Incoming messages get passed up to the control socket. 881 * Unless they are for us specifically (socket_type) 882 */ 883 static int 884 ngs_rcvmsg(node_p node, item_p item, hook_p lasthook) 885 { 886 struct ngsock *const priv = NG_NODE_PRIVATE(node); 887 struct ngpcb *const pcbp = priv->ctlsock; 888 struct socket *so; 889 struct sockaddr_ng addr; 890 struct ng_mesg *msg; 891 struct mbuf *m; 892 ng_ID_t retaddr = NGI_RETADDR(item); 893 int addrlen; 894 int error = 0; 895 896 NGI_GET_MSG(item, msg); 897 NG_FREE_ITEM(item); 898 899 /* 900 * Only allow mesgs to be passed if we have the control socket. 901 * Data sockets can only support the generic messages. 902 */ 903 if (pcbp == NULL) { 904 TRAP_ERROR; 905 NG_FREE_MSG(msg); 906 return (EINVAL); 907 } 908 so = pcbp->ng_socket; 909 910 #ifdef TRACE_MESSAGES 911 printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n", 912 retaddr, 913 msg->header.typecookie, 914 msg->header.cmd, 915 msg->header.cmdstr, 916 msg->header.flags, 917 msg->header.token); 918 #endif 919 920 if (msg->header.typecookie == NGM_SOCKET_COOKIE) { 921 switch (msg->header.cmd) { 922 case NGM_SOCK_CMD_NOLINGER: 923 priv->flags |= NGS_FLAG_NOLINGER; 924 break; 925 case NGM_SOCK_CMD_LINGER: 926 priv->flags &= ~NGS_FLAG_NOLINGER; 927 break; 928 default: 929 error = EINVAL; /* unknown command */ 930 } 931 /* Free the message and return. */ 932 NG_FREE_MSG(msg); 933 return (error); 934 } 935 936 /* Get the return address into a sockaddr. */ 937 bzero(&addr, sizeof(addr)); 938 addr.sg_len = sizeof(addr); 939 addr.sg_family = AF_NETGRAPH; 940 addrlen = snprintf((char *)&addr.sg_data, sizeof(addr.sg_data), 941 "[%x]:", retaddr); 942 if (addrlen < 0 || addrlen > sizeof(addr.sg_data)) { 943 printf("%s: snprintf([%x]) failed - %d\n", __func__, retaddr, 944 addrlen); 945 NG_FREE_MSG(msg); 946 return (EINVAL); 947 } 948 949 /* Copy the message itself into an mbuf chain. */ 950 m = m_devget((caddr_t)msg, sizeof(struct ng_mesg) + msg->header.arglen, 951 0, NULL, NULL); 952 953 /* 954 * Here we free the message. We need to do that 955 * regardless of whether we got mbufs. 956 */ 957 NG_FREE_MSG(msg); 958 959 if (m == NULL) { 960 TRAP_ERROR; 961 return (ENOBUFS); 962 } 963 964 /* Send it up to the socket. */ 965 if (sbappendaddr((struct sockbuf *)&so->so_rcv, (struct sockaddr *)&addr, m, NULL) == 0) { 966 TRAP_ERROR; 967 m_freem(m); 968 return (ENOBUFS); 969 } 970 sorwakeup(so); 971 972 return (error); 973 } 974 975 /* 976 * Receive data on a hook 977 */ 978 static int 979 ngs_rcvdata(hook_p hook, item_p item) 980 { 981 struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 982 struct ngpcb *const pcbp = priv->datasock; 983 struct socket *so; 984 struct sockaddr_ng *addr; 985 char *addrbuf[NG_HOOKSIZ + 4]; 986 int addrlen; 987 struct mbuf *m; 988 989 NGI_GET_M(item, m); 990 NG_FREE_ITEM(item); 991 992 /* If there is no data socket, black-hole it. */ 993 if (pcbp == NULL) { 994 NG_FREE_M(m); 995 return (0); 996 } 997 so = pcbp->ng_socket; 998 999 /* Get the return address into a sockaddr. */ 1000 addrlen = strlen(NG_HOOK_NAME(hook)); /* <= NG_HOOKSIZ - 1 */ 1001 addr = (struct sockaddr_ng *) addrbuf; 1002 addr->sg_len = addrlen + 3; 1003 addr->sg_family = AF_NETGRAPH; 1004 bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen); 1005 addr->sg_data[addrlen] = '\0'; 1006 1007 /* Try to tell the socket which hook it came in on. */ 1008 if (sbappendaddr((struct sockbuf *)&so->so_rcv, (struct sockaddr *)addr, m, NULL) == 0) { 1009 m_freem(m); 1010 TRAP_ERROR; 1011 return (ENOBUFS); 1012 } 1013 sorwakeup(so); 1014 return (0); 1015 } 1016 1017 /* 1018 * Hook disconnection 1019 * 1020 * For this type, removal of the last link destroys the node 1021 * if the NOLINGER flag is set. 1022 */ 1023 static int 1024 ngs_disconnect(hook_p hook) 1025 { 1026 node_p node = NG_HOOK_NODE(hook); 1027 struct ngsock *const priv = NG_NODE_PRIVATE(node); 1028 1029 if ((priv->datasock) && (priv->datasock->ng_socket)) { 1030 if (NG_NODE_NUMHOOKS(node) == 1) 1031 sosetstate(priv->datasock->ng_socket, SS_ISCONNECTED); 1032 else 1033 soclrstate(priv->datasock->ng_socket, SS_ISCONNECTED); 1034 } 1035 1036 if ((priv->flags & NGS_FLAG_NOLINGER) && 1037 (NG_NODE_NUMHOOKS(node) == 0) && (NG_NODE_IS_VALID(node))) 1038 ng_rmnode_self(node); 1039 1040 return (0); 1041 } 1042 1043 /* 1044 * Do local shutdown processing. 1045 * In this case, that involves making sure the socket 1046 * knows we should be shutting down. 1047 */ 1048 static int 1049 ngs_shutdown(node_p node) 1050 { 1051 struct ngsock *const priv = NG_NODE_PRIVATE(node); 1052 struct ngpcb *const dpcbp = priv->datasock; 1053 struct ngpcb *const pcbp = priv->ctlsock; 1054 1055 if (dpcbp != NULL) 1056 soisdisconnected(dpcbp->ng_socket); 1057 1058 if (pcbp != NULL) 1059 soisdisconnected(pcbp->ng_socket); 1060 1061 mtx_lock(&priv->mtx); 1062 priv->node = NULL; 1063 NG_NODE_SET_PRIVATE(node, NULL); 1064 ng_socket_free_priv(priv); 1065 1066 NG_NODE_UNREF(node); 1067 return (0); 1068 } 1069 1070 static void 1071 ng_socket_item_applied(void *context, int error) 1072 { 1073 struct ngsock *const priv = (struct ngsock *)context; 1074 1075 mtx_lock(&priv->mtx); 1076 priv->error = error; 1077 wakeup(priv); 1078 mtx_unlock(&priv->mtx); 1079 1080 } 1081 1082 /* 1083 * Control and data socket type descriptors 1084 * 1085 * XXXRW: Perhaps _close should do something? 1086 */ 1087 1088 static struct pr_usrreqs ngc_usrreqs = { 1089 .pru_abort = NULL, 1090 .pru_attach = ngc_attach, 1091 .pru_bind = ngc_bind, 1092 .pru_connect = ngc_connect, 1093 .pru_detach = ngc_detach, 1094 .pru_disconnect = NULL, 1095 .pru_peeraddr = NULL, 1096 .pru_send = ngc_send, 1097 .pru_shutdown = NULL, 1098 .pru_sockaddr = ng_getsockaddr, 1099 .pru_sosend = sosend, 1100 .pru_soreceive = soreceive, 1101 /* .pru_close = NULL, */ 1102 }; 1103 1104 static struct pr_usrreqs ngd_usrreqs = { 1105 .pru_abort = NULL, 1106 .pru_attach = ngd_attach, 1107 .pru_bind = NULL, 1108 .pru_connect = ngd_connect, 1109 .pru_detach = ngd_detach, 1110 .pru_disconnect = NULL, 1111 .pru_peeraddr = NULL, 1112 .pru_send = ngd_send, 1113 .pru_shutdown = NULL, 1114 .pru_sockaddr = ng_getsockaddr, 1115 .pru_sosend = sosend, 1116 .pru_soreceive = soreceive, 1117 /* .pru_close = NULL, */ 1118 }; 1119 1120 /* 1121 * Definitions of protocols supported in the NETGRAPH domain. 1122 */ 1123 1124 extern struct domain ngdomain; /* stop compiler warnings */ 1125 1126 static struct protosw ngsw[] = { 1127 { 1128 .pr_type = SOCK_DGRAM, 1129 .pr_domain = &ngdomain, 1130 .pr_protocol = NG_CONTROL, 1131 .pr_flags = PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, 1132 .pr_usrreqs = &ngc_usrreqs 1133 }, 1134 { 1135 .pr_type = SOCK_DGRAM, 1136 .pr_domain = &ngdomain, 1137 .pr_protocol = NG_DATA, 1138 .pr_flags = PR_ATOMIC | PR_ADDR, 1139 .pr_usrreqs = &ngd_usrreqs 1140 } 1141 }; 1142 1143 struct domain ngdomain = { 1144 .dom_family = AF_NETGRAPH, 1145 .dom_name = "netgraph", 1146 .dom_protosw = ngsw, 1147 .dom_protoswNPROTOSW = &ngsw[NELEM(ngsw)] 1148 }; 1149 1150 /* 1151 * Handle loading and unloading for this node type. 1152 * This is to handle auxiliary linkages (e.g protocol domain addition). 1153 */ 1154 static int 1155 ngs_mod_event(module_t mod, int event, void *data) 1156 { 1157 int error = 0; 1158 1159 switch (event) { 1160 case MOD_LOAD: 1161 /* Register protocol domain. */ 1162 net_add_domain(&ngdomain); 1163 break; 1164 case MOD_UNLOAD: 1165 #ifdef NOTYET 1166 /* Unregister protocol domain XXX can't do this yet.. */ 1167 if ((error = net_rm_domain(&ngdomain)) != 0) 1168 break; 1169 else 1170 #endif 1171 error = EBUSY; 1172 break; 1173 default: 1174 error = EOPNOTSUPP; 1175 break; 1176 } 1177 return (error); 1178 } 1179 1180 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, ""); 1181 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA"); 1182 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, ""); 1183 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL"); 1184 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, ""); 1185 1186