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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/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(struct ngpcb *pcbp, int type); 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(socket, &typestruct); 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 MTX_SYSINIT(ngsocketlist, &ngsocketlist_mtx, "ng_socketlist", MTX_DEF); 163 164 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb) 165 166 /* If getting unexplained errors returned, set this to "kdb_enter("X"); */ 167 #ifndef TRAP_ERROR 168 #define TRAP_ERROR 169 #endif 170 171 /*************************************************************** 172 Control sockets 173 ***************************************************************/ 174 175 static int 176 ngc_attach(struct socket *so, int proto, struct thread *td) 177 { 178 struct ngpcb *const pcbp = sotongpcb(so); 179 180 if (suser(td)) 181 return (EPERM); 182 if (pcbp != NULL) 183 return (EISCONN); 184 return (ng_attach_cntl(so)); 185 } 186 187 static int 188 ngc_detach(struct socket *so) 189 { 190 struct ngpcb *const pcbp = sotongpcb(so); 191 192 if (pcbp == NULL) 193 return (EINVAL); 194 ng_detach_common(pcbp, NG_CONTROL); 195 return (0); 196 } 197 198 static int 199 ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 200 struct mbuf *control, struct thread *td) 201 { 202 struct ngpcb *const pcbp = sotongpcb(so); 203 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 204 struct ng_mesg *msg; 205 struct mbuf *m0; 206 item_p item; 207 char *path = NULL; 208 int len, error = 0; 209 210 if (pcbp == NULL) { 211 error = EINVAL; 212 goto release; 213 } 214 #ifdef NOTYET 215 if (control && (error = ng_internalize(control, td))) { 216 if (pcbp->sockdata == NULL) { 217 error = ENOTCONN; 218 goto release; 219 } 220 } 221 #else /* NOTYET */ 222 if (control) { 223 error = EINVAL; 224 goto release; 225 } 226 #endif /* NOTYET */ 227 228 /* Require destination as there may be >= 1 hooks on this node */ 229 if (addr == NULL) { 230 error = EDESTADDRREQ; 231 goto release; 232 } 233 234 /* Allocate an expendable buffer for the path, chop off 235 * the sockaddr header, and make sure it's NUL terminated */ 236 len = sap->sg_len - 2; 237 MALLOC(path, char *, len + 1, M_NETGRAPH_PATH, M_WAITOK); 238 if (path == NULL) { 239 error = ENOMEM; 240 goto release; 241 } 242 bcopy(sap->sg_data, path, len); 243 path[len] = '\0'; 244 245 /* Move the actual message out of mbufs into a linear buffer. 246 * Start by adding up the size of the data. (could use mh_len?) */ 247 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next) 248 len += m0->m_len; 249 250 /* Move the data into a linear buffer as well. Messages are not 251 * delivered in mbufs. */ 252 MALLOC(msg, struct ng_mesg *, len + 1, M_NETGRAPH_MSG, M_WAITOK); 253 if (msg == NULL) { 254 error = ENOMEM; 255 goto release; 256 } 257 m_copydata(m, 0, len, (char *)msg); 258 259 if (msg->header.version != NG_VERSION && 260 msg->header.version != 0 ) { 261 error = EINVAL; 262 goto release; 263 } 264 265 /* 266 * Hack alert! 267 * We look into the message and if it mkpeers a node of unknown type, we 268 * try to load it. We need to do this now, in syscall thread, because if 269 * message gets queued and applied later we will get panic. 270 */ 271 if (msg->header.typecookie == NGM_GENERIC_COOKIE && 272 msg->header.cmd == NGM_MKPEER) { 273 struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data; 274 struct ng_type *type; 275 276 if ((type = ng_findtype(mkp->type)) == NULL) { 277 char filename[NG_TYPESIZ + 3]; 278 linker_file_t lf; 279 280 /* Not found, try to load it as a loadable module. */ 281 snprintf(filename, sizeof(filename), "ng_%s", 282 mkp->type); 283 mtx_lock(&Giant); 284 error = linker_load_module(NULL, filename, NULL, NULL, 285 &lf); 286 mtx_unlock(&Giant); 287 if (error != 0) { 288 FREE(msg, M_NETGRAPH_MSG); 289 goto release; 290 } 291 lf->userrefs++; 292 293 /* See if type has been loaded successfully. */ 294 if ((type = ng_findtype(mkp->type)) == NULL) { 295 FREE(msg, M_NETGRAPH_MSG); 296 error = ENXIO; 297 goto release; 298 } 299 } 300 } 301 302 if ((item = ng_package_msg(msg)) == NULL) { 303 error = ENOMEM; 304 #ifdef TRACE_MESSAGES 305 printf("ng_package_msg: err=%d\n", error); 306 #endif 307 goto release; 308 } 309 if ((error = ng_address_path((pcbp->sockdata->node), item, 310 path, 0)) != 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 error = ng_snd_item(item, 0); 329 330 release: 331 if (path != NULL) 332 FREE(path, M_NETGRAPH_PATH); 333 if (control != NULL) 334 m_freem(control); 335 if (m != NULL) 336 m_freem(m); 337 return (error); 338 } 339 340 static int 341 ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 342 { 343 struct ngpcb *const pcbp = sotongpcb(so); 344 345 if (pcbp == 0) 346 return (EINVAL); 347 return (ng_bind(nam, pcbp)); 348 } 349 350 static int 351 ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 352 { 353 printf(" program tried to connect control socket to remote node\n "); 354 /* 355 * At this time refuse to do this.. it used to 356 * do something but it was undocumented and not used. 357 */ 358 return (EINVAL); 359 } 360 361 /*************************************************************** 362 Data sockets 363 ***************************************************************/ 364 365 static int 366 ngd_attach(struct socket *so, int proto, struct thread *td) 367 { 368 struct ngpcb *const pcbp = sotongpcb(so); 369 370 if (pcbp != NULL) 371 return (EISCONN); 372 return (ng_attach_data(so)); 373 } 374 375 static int 376 ngd_detach(struct socket *so) 377 { 378 struct ngpcb *const pcbp = sotongpcb(so); 379 380 if (pcbp == NULL) 381 return (EINVAL); 382 ng_detach_common(pcbp, NG_DATA); 383 return (0); 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 the user used any of these ways to not specify an address 406 * then handle specially. 407 */ 408 if ((sap == NULL) 409 || ((len = sap->sg_len - 2) <= 0) 410 || (*sap->sg_data == '\0')) { 411 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) { 412 error = EDESTADDRREQ; 413 goto release; 414 } 415 /* 416 * if exactly one hook exists, just use it. 417 * Special case to allow write(2) to work on an ng_socket. 418 */ 419 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks); 420 } else { 421 if (len >= NG_HOOKSIZ) { 422 error = EINVAL; 423 goto release; 424 } 425 426 /* 427 * chop off the sockaddr header, and make sure it's NUL 428 * terminated 429 */ 430 bcopy(sap->sg_data, hookname, len); 431 hookname[len] = '\0'; 432 433 /* Find the correct hook from 'hookname' */ 434 LIST_FOREACH(hook, &pcbp->sockdata->node->nd_hooks, hk_hooks) { 435 if (strcmp(hookname, NG_HOOK_NAME(hook)) == 0) { 436 break; 437 } 438 } 439 if (hook == NULL) { 440 error = EHOSTUNREACH; 441 } 442 } 443 444 /* Send data (OK if hook is NULL) */ 445 NG_SEND_DATA_ONLY(error, hook, m); /* makes m NULL */ 446 447 release: 448 if (control != NULL) 449 m_freem(control); 450 if (m != NULL) 451 m_freem(m); 452 return (error); 453 } 454 455 static int 456 ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 457 { 458 struct ngpcb *const pcbp = sotongpcb(so); 459 460 if (pcbp == 0) 461 return (EINVAL); 462 return (ng_connect_data(nam, pcbp)); 463 } 464 465 /* 466 * Used for both data and control sockets 467 */ 468 static int 469 ng_setsockaddr(struct socket *so, struct sockaddr **addr) 470 { 471 struct ngpcb *pcbp; 472 struct sockaddr_ng *sg; 473 int sg_len, namelen, s; 474 475 /* Why isn't sg_data a `char[1]' ? :-( */ 476 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1; 477 478 s = splnet(); 479 pcbp = sotongpcb(so); 480 if ((pcbp == NULL) || (pcbp->sockdata == NULL)) { 481 splx(s); 482 return (EINVAL); 483 } 484 485 namelen = 0; /* silence compiler ! */ 486 if ( NG_NODE_HAS_NAME(pcbp->sockdata->node)) 487 sg_len += namelen = strlen(NG_NODE_NAME(pcbp->sockdata->node)); 488 489 MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK | M_ZERO); 490 491 if (NG_NODE_HAS_NAME(pcbp->sockdata->node)) 492 bcopy(NG_NODE_NAME(pcbp->sockdata->node), sg->sg_data, namelen); 493 splx(s); 494 495 sg->sg_len = sg_len; 496 sg->sg_family = AF_NETGRAPH; 497 *addr = (struct sockaddr *)sg; 498 499 return (0); 500 } 501 502 /* 503 * Attach a socket to it's protocol specific partner. 504 * For a control socket, actually create a netgraph node and attach 505 * to it as well. 506 */ 507 508 static int 509 ng_attach_cntl(struct socket *so) 510 { 511 struct ngsock *privdata; 512 struct ngpcb *pcbp; 513 int error; 514 515 /* Setup protocol control block */ 516 if ((error = ng_attach_common(so, NG_CONTROL)) != 0) 517 return (error); 518 pcbp = sotongpcb(so); 519 520 /* Allocate node private info */ 521 MALLOC(privdata, struct ngsock *, 522 sizeof(*privdata), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO); 523 if (privdata == NULL) { 524 ng_detach_common(pcbp, NG_CONTROL); 525 return (ENOMEM); 526 } 527 528 /* Make the generic node components */ 529 if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) { 530 FREE(privdata, M_NETGRAPH_SOCK); 531 ng_detach_common(pcbp, NG_CONTROL); 532 return (error); 533 } 534 NG_NODE_SET_PRIVATE(privdata->node, privdata); 535 536 /* Link the pcb and the node private data */ 537 privdata->ctlsock = pcbp; 538 pcbp->sockdata = privdata; 539 privdata->refs++; 540 return (0); 541 } 542 543 static int 544 ng_attach_data(struct socket *so) 545 { 546 return(ng_attach_common(so, NG_DATA)); 547 } 548 549 /* 550 * Set up a socket protocol control block. 551 * This code is shared between control and data sockets. 552 */ 553 static int 554 ng_attach_common(struct socket *so, int type) 555 { 556 struct ngpcb *pcbp; 557 int error; 558 559 /* Standard socket setup stuff */ 560 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace); 561 if (error) 562 return (error); 563 564 /* Allocate the pcb */ 565 MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO); 566 if (pcbp == NULL) 567 return (ENOMEM); 568 pcbp->type = type; 569 570 /* Link the pcb and the socket */ 571 so->so_pcb = (caddr_t) pcbp; 572 pcbp->ng_socket = so; 573 574 /* Add the socket to linked list */ 575 mtx_lock(&ngsocketlist_mtx); 576 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks); 577 mtx_unlock(&ngsocketlist_mtx); 578 return (0); 579 } 580 581 /* 582 * Disassociate the socket from it's protocol specific 583 * partner. If it's attached to a node's private data structure, 584 * then unlink from that too. If we were the last socket attached to it, 585 * then shut down the entire node. Shared code for control and data sockets. 586 */ 587 static void 588 ng_detach_common(struct ngpcb *pcbp, int which) 589 { 590 struct ngsock *priv; 591 592 if (pcbp->sockdata) { 593 priv = pcbp->sockdata; 594 pcbp->sockdata = NULL; 595 switch (which) { 596 case NG_CONTROL: 597 priv->ctlsock = NULL; 598 break; 599 case NG_DATA: 600 priv->datasock = NULL; 601 break; 602 default: 603 panic(__func__); 604 } 605 if ((--priv->refs == 0) && (priv->node != NULL)) 606 ng_rmnode_self(priv->node); 607 } 608 pcbp->ng_socket->so_pcb = NULL; 609 pcbp->ng_socket = NULL; 610 mtx_lock(&ngsocketlist_mtx); 611 LIST_REMOVE(pcbp, socks); 612 mtx_unlock(&ngsocketlist_mtx); 613 FREE(pcbp, M_PCB); 614 } 615 616 #ifdef NOTYET 617 /* 618 * File descriptors can be passed into an AF_NETGRAPH socket. 619 * Note, that file descriptors cannot be passed OUT. 620 * Only character device descriptors are accepted. 621 * Character devices are useful to connect a graph to a device, 622 * which after all is the purpose of this whole system. 623 */ 624 static int 625 ng_internalize(struct mbuf *control, struct thread *td) 626 { 627 const struct cmsghdr *cm = mtod(control, const struct cmsghdr *); 628 struct file *fp; 629 struct vnode *vn; 630 int oldfds; 631 int fd; 632 633 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || 634 cm->cmsg_len != control->m_len) { 635 TRAP_ERROR; 636 return (EINVAL); 637 } 638 639 /* Check there is only one FD. XXX what would more than one signify? */ 640 oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int); 641 if (oldfds != 1) { 642 TRAP_ERROR; 643 return (EINVAL); 644 } 645 646 /* Check that the FD given is legit. and change it to a pointer to a 647 * struct file. */ 648 fd = CMSG_DATA(cm); 649 if ((error = fget(td, fd, &fp)) != 0) 650 return (error); 651 652 /* Depending on what kind of resource it is, act differently. For 653 * devices, we treat it as a file. For an AF_NETGRAPH socket, 654 * shortcut straight to the node. */ 655 switch (fp->f_type) { 656 case DTYPE_VNODE: 657 vn = fp->f_data; 658 if (vn && (vn->v_type == VCHR)) { 659 /* for a VCHR, actually reference the FILE */ 660 fp->f_count++; 661 /* XXX then what :) */ 662 /* how to pass on to other modules? */ 663 } else { 664 fdrop(fp, td); 665 TRAP_ERROR; 666 return (EINVAL); 667 } 668 break; 669 default: 670 fdrop(fp, td); 671 TRAP_ERROR; 672 return (EINVAL); 673 } 674 fdrop(fp, td); 675 return (0); 676 } 677 #endif /* NOTYET */ 678 679 /* 680 * Connect the data socket to a named control socket node. 681 */ 682 static int 683 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp) 684 { 685 struct sockaddr_ng *sap; 686 node_p farnode; 687 struct ngsock *priv; 688 int error; 689 item_p item; 690 691 /* If we are already connected, don't do it again */ 692 if (pcbp->sockdata != NULL) 693 return (EISCONN); 694 695 /* Find the target (victim) and check it doesn't already have a data 696 * socket. Also check it is a 'socket' type node. 697 * Use ng_package_data() and address_path() to do this. 698 */ 699 700 sap = (struct sockaddr_ng *) nam; 701 /* The item will hold the node reference */ 702 item = ng_package_data(NULL, NULL); 703 if (item == NULL) { 704 return (ENOMEM); 705 } 706 if ((error = ng_address_path(NULL, item, sap->sg_data, 0))) 707 return (error); /* item is freed on failure */ 708 709 /* 710 * Extract node from item and free item. Remember we now have 711 * a reference on the node. The item holds it for us. 712 * when we free the item we release the reference. 713 */ 714 farnode = item->el_dest; /* shortcut */ 715 if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) { 716 NG_FREE_ITEM(item); /* drop the reference to the node */ 717 return (EINVAL); 718 } 719 priv = NG_NODE_PRIVATE(farnode); 720 if (priv->datasock != NULL) { 721 NG_FREE_ITEM(item); /* drop the reference to the node */ 722 return (EADDRINUSE); 723 } 724 725 /* 726 * Link the PCB and the private data struct. and note the extra 727 * reference. Drop the extra reference on the node. 728 */ 729 priv->datasock = pcbp; 730 pcbp->sockdata = priv; 731 priv->refs++; /* XXX possible race if it's being freed */ 732 NG_FREE_ITEM(item); /* drop the reference to the node */ 733 return (0); 734 } 735 736 /* 737 * Binding a socket means giving the corresponding node a name 738 */ 739 static int 740 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp) 741 { 742 struct ngsock *const priv = pcbp->sockdata; 743 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam; 744 745 if (priv == NULL) { 746 TRAP_ERROR; 747 return (EINVAL); 748 } 749 if ((sap->sg_len < 4) 750 || (sap->sg_len > (NG_NODESIZ + 2)) 751 || (sap->sg_data[0] == '\0') 752 || (sap->sg_data[sap->sg_len - 3] != '\0')) { 753 TRAP_ERROR; 754 return (EINVAL); 755 } 756 return (ng_name_node(priv->node, sap->sg_data)); 757 } 758 759 /* 760 * Take a message and pass it up to the control socket associated 761 * with the node. 762 */ 763 static int 764 ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr) 765 { 766 struct socket *const so = pcbp->ng_socket; 767 struct mbuf *mdata; 768 int msglen; 769 int error = 0; 770 771 /* Copy the message itself into an mbuf chain */ 772 msglen = sizeof(struct ng_mesg) + msg->header.arglen; 773 mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL); 774 775 /* Here we free the message, as we are the end of the line. 776 * We need to do that regardless of whether we got mbufs. */ 777 NG_FREE_MSG(msg); 778 779 if (mdata == NULL) { 780 TRAP_ERROR; 781 return (ENOBUFS); 782 } 783 784 /* Send it up to the socket */ 785 if (sbappendaddr(&so->so_rcv, 786 (struct sockaddr *) addr, mdata, NULL) == 0) { 787 TRAP_ERROR; 788 m_freem(mdata); 789 error = so->so_error = ENOBUFS; 790 } 791 sorwakeup(so); 792 return (error); 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) 825 && (priv->datasock->ng_socket)) { 826 if (NG_NODE_NUMHOOKS(node) == 1) { 827 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED; 828 } else { 829 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED; 830 } 831 } 832 return (0); 833 } 834 835 /* 836 * Incoming messages get passed up to the control socket. 837 * Unless they are for us specifically (socket_type) 838 */ 839 static int 840 ngs_rcvmsg(node_p node, item_p item, hook_p lasthook) 841 { 842 struct ngsock *const priv = NG_NODE_PRIVATE(node); 843 struct ngpcb *const pcbp = priv->ctlsock; 844 struct sockaddr_ng *addr; 845 int addrlen; 846 int error = 0; 847 struct ng_mesg *msg; 848 ng_ID_t retaddr = NGI_RETADDR(item); 849 char retabuf[32]; 850 851 NGI_GET_MSG(item, msg); 852 NG_FREE_ITEM(item); /* we have all we need */ 853 854 /* Only allow mesgs to be passed if we have the control socket. 855 * Data sockets can only support the generic messages. */ 856 if (pcbp == NULL) { 857 TRAP_ERROR; 858 return (EINVAL); 859 } 860 861 #ifdef TRACE_MESSAGES 862 printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n", 863 retaddr, 864 msg->header.typecookie, 865 msg->header.cmd, 866 msg->header.cmdstr, 867 msg->header.flags, 868 msg->header.token); 869 #endif 870 871 if (msg->header.typecookie == NGM_SOCKET_COOKIE) { 872 switch (msg->header.cmd) { 873 case NGM_SOCK_CMD_NOLINGER: 874 priv->flags |= NGS_FLAG_NOLINGER; 875 break; 876 case NGM_SOCK_CMD_LINGER: 877 priv->flags &= ~NGS_FLAG_NOLINGER; 878 break; 879 default: 880 error = EINVAL; /* unknown command */ 881 } 882 /* Free the message and return */ 883 NG_FREE_MSG(msg); 884 return(error); 885 886 } 887 /* Get the return address into a sockaddr */ 888 sprintf(retabuf,"[%x]:", retaddr); 889 addrlen = strlen(retabuf); 890 MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH_PATH, M_NOWAIT); 891 if (addr == NULL) { 892 TRAP_ERROR; 893 return (ENOMEM); 894 } 895 addr->sg_len = addrlen + 3; 896 addr->sg_family = AF_NETGRAPH; 897 bcopy(retabuf, addr->sg_data, addrlen); 898 addr->sg_data[addrlen] = '\0'; 899 900 /* Send it up */ 901 error = ship_msg(pcbp, msg, addr); 902 FREE(addr, M_NETGRAPH_PATH); 903 return (error); 904 } 905 906 /* 907 * Receive data on a hook 908 */ 909 static int 910 ngs_rcvdata(hook_p hook, item_p item) 911 { 912 struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 913 struct ngpcb *const pcbp = priv->datasock; 914 struct socket *so; 915 struct sockaddr_ng *addr; 916 char *addrbuf[NG_HOOKSIZ + 4]; 917 int addrlen; 918 struct mbuf *m; 919 920 NGI_GET_M(item, m); 921 NG_FREE_ITEM(item); 922 /* If there is no data socket, black-hole it */ 923 if (pcbp == NULL) { 924 NG_FREE_M(m); 925 return (0); 926 } 927 so = pcbp->ng_socket; 928 929 /* Get the return address into a sockaddr. */ 930 addrlen = strlen(NG_HOOK_NAME(hook)); /* <= NG_HOOKSIZ - 1 */ 931 addr = (struct sockaddr_ng *) addrbuf; 932 addr->sg_len = addrlen + 3; 933 addr->sg_family = AF_NETGRAPH; 934 bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen); 935 addr->sg_data[addrlen] = '\0'; 936 937 /* Try to tell the socket which hook it came in on */ 938 if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) { 939 m_freem(m); 940 TRAP_ERROR; 941 return (ENOBUFS); 942 } 943 sorwakeup(so); 944 return (0); 945 } 946 947 /* 948 * Hook disconnection 949 * 950 * For this type, removal of the last link destroys the node 951 * if the NOLINGER flag is set. 952 */ 953 static int 954 ngs_disconnect(hook_p hook) 955 { 956 node_p node = NG_HOOK_NODE(hook); 957 struct ngsock *const priv = NG_NODE_PRIVATE(node); 958 959 if ((priv->datasock) 960 && (priv->datasock->ng_socket)) { 961 if (NG_NODE_NUMHOOKS(node) == 1) { 962 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED; 963 } else { 964 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED; 965 } 966 } 967 968 if ((priv->flags & NGS_FLAG_NOLINGER ) 969 && (NG_NODE_NUMHOOKS(node) == 0) 970 && (NG_NODE_IS_VALID(node))) { 971 ng_rmnode_self(node); 972 } 973 return (0); 974 } 975 976 /* 977 * Do local shutdown processing. 978 * In this case, that involves making sure the socket 979 * knows we should be shutting down. 980 */ 981 static int 982 ngs_shutdown(node_p node) 983 { 984 struct ngsock *const priv = NG_NODE_PRIVATE(node); 985 struct ngpcb *const dpcbp = priv->datasock; 986 struct ngpcb *const pcbp = priv->ctlsock; 987 988 if (dpcbp != NULL) { 989 soisdisconnected(dpcbp->ng_socket); 990 dpcbp->sockdata = NULL; 991 priv->datasock = NULL; 992 priv->refs--; 993 } 994 if (pcbp != NULL) { 995 soisdisconnected(pcbp->ng_socket); 996 pcbp->sockdata = NULL; 997 priv->ctlsock = NULL; 998 priv->refs--; 999 } 1000 NG_NODE_SET_PRIVATE(node, NULL); 1001 NG_NODE_UNREF(node); 1002 FREE(priv, M_NETGRAPH_SOCK); 1003 return (0); 1004 } 1005 1006 static int 1007 dummy_disconnect(struct socket *so) 1008 { 1009 return (0); 1010 } 1011 /* 1012 * Control and data socket type descriptors 1013 */ 1014 1015 static struct pr_usrreqs ngc_usrreqs = { 1016 NULL, /* abort */ 1017 pru_accept_notsupp, 1018 ngc_attach, 1019 ngc_bind, 1020 ngc_connect, 1021 pru_connect2_notsupp, 1022 pru_control_notsupp, 1023 ngc_detach, 1024 dummy_disconnect, /* disconnect */ 1025 pru_listen_notsupp, 1026 NULL, /* setpeeraddr */ 1027 pru_rcvd_notsupp, 1028 pru_rcvoob_notsupp, 1029 ngc_send, 1030 pru_sense_null, 1031 NULL, /* shutdown */ 1032 ng_setsockaddr, 1033 sosend, 1034 soreceive, 1035 sopoll, 1036 pru_sosetlabel_null 1037 }; 1038 1039 static struct pr_usrreqs ngd_usrreqs = { 1040 NULL, /* abort */ 1041 pru_accept_notsupp, 1042 ngd_attach, 1043 NULL, /* bind */ 1044 ngd_connect, 1045 pru_connect2_notsupp, 1046 pru_control_notsupp, 1047 ngd_detach, 1048 dummy_disconnect, /* disconnect */ 1049 pru_listen_notsupp, 1050 NULL, /* setpeeraddr */ 1051 pru_rcvd_notsupp, 1052 pru_rcvoob_notsupp, 1053 ngd_send, 1054 pru_sense_null, 1055 NULL, /* shutdown */ 1056 ng_setsockaddr, 1057 sosend, 1058 soreceive, 1059 sopoll, 1060 pru_sosetlabel_null 1061 }; 1062 1063 /* 1064 * Definitions of protocols supported in the NETGRAPH domain. 1065 */ 1066 1067 extern struct domain ngdomain; /* stop compiler warnings */ 1068 1069 static struct protosw ngsw[] = { 1070 { 1071 SOCK_DGRAM, /* protocol type */ 1072 &ngdomain, /* backpointer to domain */ 1073 NG_CONTROL, 1074 PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, /* flags */ 1075 0, 0, 0, 0, /* input, output, ctlinput, ctloutput */ 1076 NULL, /* ousrreq */ 1077 0, 0, 0, 0, /* init, fasttimeo, slowtimo, drain */ 1078 &ngc_usrreqs, /* usrreq table (above) */ 1079 /*{NULL}*/ /* pffh (protocol filter head?) */ 1080 }, 1081 { 1082 SOCK_DGRAM, /* protocol type */ 1083 &ngdomain, /* backpointer to domain */ 1084 NG_DATA, 1085 PR_ATOMIC | PR_ADDR, /* flags */ 1086 0, 0, 0, 0, /* input, output, ctlinput, ctloutput */ 1087 NULL, /* ousrreq() */ 1088 0, 0, 0, 0, /* init, fasttimeo, slowtimo, drain */ 1089 &ngd_usrreqs, /* usrreq table (above) */ 1090 /*{NULL}*/ /* pffh (protocol filter head?) */ 1091 } 1092 }; 1093 1094 struct domain ngdomain = { 1095 AF_NETGRAPH, 1096 "netgraph", 1097 NULL, /* init() */ 1098 NULL, /* externalise() */ 1099 NULL, /* dispose() */ 1100 ngsw, /* protosw entry */ 1101 &ngsw[sizeof(ngsw) / sizeof(ngsw[0])], /* Number of protosw entries */ 1102 NULL, /* next domain in list */ 1103 NULL, /* rtattach() */ 1104 0, /* arg to rtattach in bits */ 1105 0 /* maxrtkey */ 1106 }; 1107 1108 /* 1109 * Handle loading and unloading for this node type 1110 * This is to handle auxiliary linkages (e.g protocol domain addition). 1111 */ 1112 static int 1113 ngs_mod_event(module_t mod, int event, void *data) 1114 { 1115 int error = 0; 1116 1117 switch (event) { 1118 case MOD_LOAD: 1119 /* Register protocol domain */ 1120 net_add_domain(&ngdomain); 1121 break; 1122 case MOD_UNLOAD: 1123 /* Insure there are no open netgraph sockets */ 1124 if (!LIST_EMPTY(&ngsocklist)) { 1125 error = EBUSY; 1126 break; 1127 } 1128 1129 #ifdef NOTYET 1130 if ((LIST_EMPTY(&ngsocklist)) && (typestruct.refs == 0)) { 1131 /* Unregister protocol domain XXX can't do this yet.. */ 1132 if ((error = net_rm_domain(&ngdomain)) != 0) 1133 break; 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
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