ng_socket.c revision 147774
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: head/sys/netgraph/ng_socket.c 147774 2005-07-05 17:35:20Z glebius $ 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 79MALLOC_DEFINE(M_NETGRAPH_PATH, "netgraph_path", "netgraph path info "); 80MALLOC_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 */ 113static ng_constructor_t ngs_constructor; 114static ng_rcvmsg_t ngs_rcvmsg; 115static ng_shutdown_t ngs_shutdown; 116static ng_newhook_t ngs_newhook; 117static ng_connect_t ngs_connect; 118static ng_rcvdata_t ngs_rcvdata; 119static ng_disconnect_t ngs_disconnect; 120 121/* Internal methods */ 122static int ng_attach_data(struct socket *so); 123static int ng_attach_cntl(struct socket *so); 124static int ng_attach_common(struct socket *so, int type); 125static 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 128static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp); 129static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp); 130 131static int ngs_mod_event(module_t mod, int event, void *data); 132static int ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, 133 struct sockaddr_ng *addr); 134static void ng_socket_item_applied(void *context, int error); 135 136/* Netgraph type descriptor */ 137static struct ng_type typestruct = { 138 .version = NG_ABI_VERSION, 139 .name = NG_SOCKET_NODE_TYPE, 140 .mod_event = ngs_mod_event, 141 .constructor = ngs_constructor, 142 .rcvmsg = ngs_rcvmsg, 143 .shutdown = ngs_shutdown, 144 .newhook = ngs_newhook, 145 .connect = ngs_connect, 146 .rcvdata = ngs_rcvdata, 147 .disconnect = ngs_disconnect, 148}; 149NETGRAPH_INIT_ORDERED(socket, &typestruct, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY); 150 151/* Buffer space */ 152static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */ 153SYSCTL_INT(_net_graph, OID_AUTO, maxdgram, CTLFLAG_RW, 154 &ngpdg_sendspace , 0, "Maximum outgoing Netgraph datagram size"); 155static u_long ngpdg_recvspace = 20 * 1024; 156SYSCTL_INT(_net_graph, OID_AUTO, recvspace, CTLFLAG_RW, 157 &ngpdg_recvspace , 0, "Maximum space for incoming Netgraph datagrams"); 158 159/* List of all sockets */ 160static LIST_HEAD(, ngpcb) ngsocklist; 161 162static struct mtx ngsocketlist_mtx; 163 164#define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb) 165 166/* If getting unexplained errors returned, set this to "kdb_enter("X"); */ 167#ifndef TRAP_ERROR 168#define TRAP_ERROR 169#endif 170 171/*************************************************************** 172 Control sockets 173***************************************************************/ 174 175static int 176ngc_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 187static int 188ngc_detach(struct socket *so) 189{ 190 struct ngpcb *const pcbp = sotongpcb(so); 191 192 if (pcbp == NULL) 193 return (EINVAL); 194 195 /* 196 * If there is a node, then obtain netgraph locking first. 197 */ 198 if (pcbp->sockdata != NULL) 199 ng_send_fn1(pcbp->sockdata->node, NULL, &ng_detach_common, 200 pcbp, NG_CONTROL, NG_WAITOK); 201 else 202 ng_detach_common(NULL, NULL, pcbp, NG_CONTROL); 203 204 return (0); 205} 206 207static int 208ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 209 struct mbuf *control, struct thread *td) 210{ 211 struct ngpcb *const pcbp = sotongpcb(so); 212 struct ngsock *const priv = NG_NODE_PRIVATE(pcbp->sockdata->node); 213 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 214 struct ng_mesg *msg; 215 struct mbuf *m0; 216 item_p item; 217 char *path = NULL; 218 int len, error = 0; 219 220 if (pcbp == NULL) { 221 error = EINVAL; 222 goto release; 223 } 224#ifdef NOTYET 225 if (control && (error = ng_internalize(control, td))) { 226 if (pcbp->sockdata == NULL) { 227 error = ENOTCONN; 228 goto release; 229 } 230 } 231#else /* NOTYET */ 232 if (control) { 233 error = EINVAL; 234 goto release; 235 } 236#endif /* NOTYET */ 237 238 /* Require destination as there may be >= 1 hooks on this node */ 239 if (addr == NULL) { 240 error = EDESTADDRREQ; 241 goto release; 242 } 243 244 /* Allocate an expendable buffer for the path, chop off 245 * the sockaddr header, and make sure it's NUL terminated */ 246 len = sap->sg_len - 2; 247 MALLOC(path, char *, len + 1, M_NETGRAPH_PATH, M_WAITOK); 248 if (path == NULL) { 249 error = ENOMEM; 250 goto release; 251 } 252 bcopy(sap->sg_data, path, len); 253 path[len] = '\0'; 254 255 /* Move the actual message out of mbufs into a linear buffer. 256 * Start by adding up the size of the data. (could use mh_len?) */ 257 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next) 258 len += m0->m_len; 259 260 /* Move the data into a linear buffer as well. Messages are not 261 * delivered in mbufs. */ 262 MALLOC(msg, struct ng_mesg *, len + 1, M_NETGRAPH_MSG, M_WAITOK); 263 if (msg == NULL) { 264 error = ENOMEM; 265 goto release; 266 } 267 m_copydata(m, 0, len, (char *)msg); 268 269 if (msg->header.version != NG_VERSION) { 270 error = EINVAL; 271 goto release; 272 } 273 274 /* 275 * Hack alert! 276 * We look into the message and if it mkpeers a node of unknown type, we 277 * try to load it. We need to do this now, in syscall thread, because if 278 * message gets queued and applied later we will get panic. 279 */ 280 if (msg->header.typecookie == NGM_GENERIC_COOKIE && 281 msg->header.cmd == NGM_MKPEER) { 282 struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data; 283 struct ng_type *type; 284 285 if ((type = ng_findtype(mkp->type)) == NULL) { 286 char filename[NG_TYPESIZ + 3]; 287 linker_file_t lf; 288 289 /* Not found, try to load it as a loadable module. */ 290 snprintf(filename, sizeof(filename), "ng_%s", 291 mkp->type); 292 mtx_lock(&Giant); 293 error = linker_load_module(NULL, filename, NULL, NULL, 294 &lf); 295 mtx_unlock(&Giant); 296 if (error != 0) { 297 FREE(msg, M_NETGRAPH_MSG); 298 goto release; 299 } 300 lf->userrefs++; 301 302 /* See if type has been loaded successfully. */ 303 if ((type = ng_findtype(mkp->type)) == NULL) { 304 FREE(msg, M_NETGRAPH_MSG); 305 error = ENXIO; 306 goto release; 307 } 308 } 309 } 310 311 if ((item = ng_package_msg(msg, M_WAITOK)) == NULL) { 312 error = ENOMEM; 313#ifdef TRACE_MESSAGES 314 printf("ng_package_msg: err=%d\n", error); 315#endif 316 goto release; 317 } 318 if ((error = ng_address_path((pcbp->sockdata->node), item, 319 path, 0)) != 0) { 320#ifdef TRACE_MESSAGES 321 printf("ng_address_path: errx=%d\n", error); 322#endif 323 goto release; 324 } 325 326#ifdef TRACE_MESSAGES 327 printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n", 328 item->el_dest->nd_ID, 329 msg->header.typecookie, 330 msg->header.cmd, 331 msg->header.cmdstr, 332 msg->header.flags, 333 msg->header.token, 334 item->el_dest->nd_type->name); 335#endif 336 SAVE_LINE(item); 337 /* 338 * We do not want to return from syscall until the item 339 * is processed by destination node. We register callback 340 * on the item, which will update priv->error when item 341 * was applied. 342 * If ng_snd_item() has queued item, we sleep until 343 * callback wakes us up. 344 */ 345 item->apply = ng_socket_item_applied; 346 item->context = priv; 347 priv->error = -1; 348 349 error = ng_snd_item(item, NG_PROGRESS); 350 351 if (error == EINPROGRESS) { 352 mtx_lock(&priv->mtx); 353 if (priv->error == -1) 354 msleep(priv, &priv->mtx, 0, "ngsock", 0); 355 mtx_unlock(&priv->mtx); 356 KASSERT(priv->error != -1, 357 ("ng_socket: priv->error wasn't updated")); 358 error = priv->error; 359 } 360 361release: 362 if (path != NULL) 363 FREE(path, M_NETGRAPH_PATH); 364 if (control != NULL) 365 m_freem(control); 366 if (m != NULL) 367 m_freem(m); 368 return (error); 369} 370 371static int 372ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 373{ 374 struct ngpcb *const pcbp = sotongpcb(so); 375 376 if (pcbp == 0) 377 return (EINVAL); 378 return (ng_bind(nam, pcbp)); 379} 380 381static int 382ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 383{ 384printf(" program tried to connect control socket to remote node\n "); 385 /* 386 * At this time refuse to do this.. it used to 387 * do something but it was undocumented and not used. 388 */ 389 return (EINVAL); 390} 391 392/*************************************************************** 393 Data sockets 394***************************************************************/ 395 396static int 397ngd_attach(struct socket *so, int proto, struct thread *td) 398{ 399 struct ngpcb *const pcbp = sotongpcb(so); 400 401 if (pcbp != NULL) 402 return (EISCONN); 403 return (ng_attach_data(so)); 404} 405 406static int 407ngd_detach(struct socket *so) 408{ 409 struct ngpcb *const pcbp = sotongpcb(so); 410 411 if (pcbp == NULL) 412 return (EINVAL); 413 414 /* 415 * If there is a node, then obtain netgraph locking first. 416 */ 417 if (pcbp->sockdata != NULL) 418 ng_send_fn1(pcbp->sockdata->node, NULL, &ng_detach_common, 419 pcbp, NG_DATA, NG_WAITOK); 420 else 421 ng_detach_common(NULL, NULL, pcbp, NG_DATA); 422 423 return (0); 424} 425 426static int 427ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 428 struct mbuf *control, struct thread *td) 429{ 430 struct ngpcb *const pcbp = sotongpcb(so); 431 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 432 int len, error; 433 hook_p hook = NULL; 434 char hookname[NG_HOOKSIZ]; 435 436 if ((pcbp == NULL) || (control != NULL)) { 437 error = EINVAL; 438 goto release; 439 } 440 if (pcbp->sockdata == NULL) { 441 error = ENOTCONN; 442 goto release; 443 } 444 445 if (sap == NULL) 446 len = 0; /* Make compiler happy. */ 447 else 448 len = sap->sg_len - 2; 449 450 /* 451 * If the user used any of these ways to not specify an address 452 * then handle specially. 453 */ 454 if ((sap == NULL) || (len <= 0) || (*sap->sg_data == '\0')) { 455 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) { 456 error = EDESTADDRREQ; 457 goto release; 458 } 459 /* 460 * if exactly one hook exists, just use it. 461 * Special case to allow write(2) to work on an ng_socket. 462 */ 463 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks); 464 } else { 465 if (len >= NG_HOOKSIZ) { 466 error = EINVAL; 467 goto release; 468 } 469 470 /* 471 * chop off the sockaddr header, and make sure it's NUL 472 * terminated 473 */ 474 bcopy(sap->sg_data, hookname, len); 475 hookname[len] = '\0'; 476 477 /* Find the correct hook from 'hookname' */ 478 LIST_FOREACH(hook, &pcbp->sockdata->node->nd_hooks, hk_hooks) { 479 if (strcmp(hookname, NG_HOOK_NAME(hook)) == 0) { 480 break; 481 } 482 } 483 if (hook == NULL) { 484 error = EHOSTUNREACH; 485 } 486 } 487 488 /* Send data (OK if hook is NULL) */ 489 NG_SEND_DATA_ONLY(error, hook, m); /* makes m NULL */ 490 491release: 492 if (control != NULL) 493 m_freem(control); 494 if (m != NULL) 495 m_freem(m); 496 return (error); 497} 498 499static int 500ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 501{ 502 struct ngpcb *const pcbp = sotongpcb(so); 503 504 if (pcbp == 0) 505 return (EINVAL); 506 return (ng_connect_data(nam, pcbp)); 507} 508 509/* 510 * Used for both data and control sockets 511 */ 512static int 513ng_setsockaddr(struct socket *so, struct sockaddr **addr) 514{ 515 struct ngpcb *pcbp; 516 struct sockaddr_ng *sg; 517 int sg_len, namelen, s; 518 519 /* Why isn't sg_data a `char[1]' ? :-( */ 520 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1; 521 522 s = splnet(); 523 pcbp = sotongpcb(so); 524 if ((pcbp == NULL) || (pcbp->sockdata == NULL)) { 525 splx(s); 526 return (EINVAL); 527 } 528 529 namelen = 0; /* silence compiler ! */ 530 if ( NG_NODE_HAS_NAME(pcbp->sockdata->node)) 531 sg_len += namelen = strlen(NG_NODE_NAME(pcbp->sockdata->node)); 532 533 MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK | M_ZERO); 534 535 if (NG_NODE_HAS_NAME(pcbp->sockdata->node)) 536 bcopy(NG_NODE_NAME(pcbp->sockdata->node), sg->sg_data, namelen); 537 splx(s); 538 539 sg->sg_len = sg_len; 540 sg->sg_family = AF_NETGRAPH; 541 *addr = (struct sockaddr *)sg; 542 543 return (0); 544} 545 546/* 547 * Attach a socket to it's protocol specific partner. 548 * For a control socket, actually create a netgraph node and attach 549 * to it as well. 550 */ 551 552static int 553ng_attach_cntl(struct socket *so) 554{ 555 struct ngsock *privdata; 556 struct ngpcb *pcbp; 557 int error; 558 559 /* Setup protocol control block */ 560 if ((error = ng_attach_common(so, NG_CONTROL)) != 0) 561 return (error); 562 pcbp = sotongpcb(so); 563 564 /* Allocate node private info */ 565 MALLOC(privdata, struct ngsock *, 566 sizeof(*privdata), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO); 567 if (privdata == NULL) { 568 ng_detach_common(NULL, NULL, pcbp, NG_CONTROL); 569 return (ENOMEM); 570 } 571 572 /* Make the generic node components */ 573 if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) { 574 FREE(privdata, M_NETGRAPH_SOCK); 575 ng_detach_common(NULL, NULL, pcbp, NG_CONTROL); 576 return (error); 577 } 578 NG_NODE_SET_PRIVATE(privdata->node, privdata); 579 580 mtx_init(&privdata->mtx, "ng_socket", NULL, MTX_DEF); 581 582 /* Link the pcb and the node private data */ 583 privdata->ctlsock = pcbp; 584 pcbp->sockdata = privdata; 585 privdata->refs++; 586 return (0); 587} 588 589static int 590ng_attach_data(struct socket *so) 591{ 592 return(ng_attach_common(so, NG_DATA)); 593} 594 595/* 596 * Set up a socket protocol control block. 597 * This code is shared between control and data sockets. 598 */ 599static int 600ng_attach_common(struct socket *so, int type) 601{ 602 struct ngpcb *pcbp; 603 int error; 604 605 /* Standard socket setup stuff */ 606 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace); 607 if (error) 608 return (error); 609 610 /* Allocate the pcb */ 611 MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO); 612 if (pcbp == NULL) 613 return (ENOMEM); 614 pcbp->type = type; 615 616 /* Link the pcb and the socket */ 617 so->so_pcb = (caddr_t) pcbp; 618 pcbp->ng_socket = so; 619 620 /* Add the socket to linked list */ 621 mtx_lock(&ngsocketlist_mtx); 622 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks); 623 mtx_unlock(&ngsocketlist_mtx); 624 return (0); 625} 626 627/* 628 * Disassociate the socket from it's protocol specific 629 * partner. If it's attached to a node's private data structure, 630 * then unlink from that too. If we were the last socket attached to it, 631 * then shut down the entire node. Shared code for control and data sockets. 632 */ 633static void 634ng_detach_common(node_p node, hook_p hook, void *arg1, int which) 635{ 636 struct ngpcb *pcbp = arg1; 637 638 if (pcbp->sockdata) { 639 struct ngsock *priv; 640 641 priv = pcbp->sockdata; 642 pcbp->sockdata = NULL; 643 switch (which) { 644 case NG_CONTROL: 645 priv->ctlsock = NULL; 646 break; 647 case NG_DATA: 648 priv->datasock = NULL; 649 break; 650 default: 651 panic(__func__); 652 } 653 if ((--priv->refs == 0) && (priv->node != NULL)) 654 ng_rmnode_self(priv->node); 655 } 656 pcbp->ng_socket->so_pcb = NULL; 657 pcbp->ng_socket = NULL; 658 mtx_lock(&ngsocketlist_mtx); 659 LIST_REMOVE(pcbp, socks); 660 mtx_unlock(&ngsocketlist_mtx); 661 FREE(pcbp, M_PCB); 662} 663 664#ifdef NOTYET 665/* 666 * File descriptors can be passed into an AF_NETGRAPH socket. 667 * Note, that file descriptors cannot be passed OUT. 668 * Only character device descriptors are accepted. 669 * Character devices are useful to connect a graph to a device, 670 * which after all is the purpose of this whole system. 671 */ 672static int 673ng_internalize(struct mbuf *control, struct thread *td) 674{ 675 const struct cmsghdr *cm = mtod(control, const struct cmsghdr *); 676 struct file *fp; 677 struct vnode *vn; 678 int oldfds; 679 int fd; 680 681 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || 682 cm->cmsg_len != control->m_len) { 683 TRAP_ERROR; 684 return (EINVAL); 685 } 686 687 /* Check there is only one FD. XXX what would more than one signify? */ 688 oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int); 689 if (oldfds != 1) { 690 TRAP_ERROR; 691 return (EINVAL); 692 } 693 694 /* Check that the FD given is legit. and change it to a pointer to a 695 * struct file. */ 696 fd = CMSG_DATA(cm); 697 if ((error = fget(td, fd, &fp)) != 0) 698 return (error); 699 700 /* Depending on what kind of resource it is, act differently. For 701 * devices, we treat it as a file. For an AF_NETGRAPH socket, 702 * shortcut straight to the node. */ 703 switch (fp->f_type) { 704 case DTYPE_VNODE: 705 vn = fp->f_data; 706 if (vn && (vn->v_type == VCHR)) { 707 /* for a VCHR, actually reference the FILE */ 708 fp->f_count++; 709 /* XXX then what :) */ 710 /* how to pass on to other modules? */ 711 } else { 712 fdrop(fp, td); 713 TRAP_ERROR; 714 return (EINVAL); 715 } 716 break; 717 default: 718 fdrop(fp, td); 719 TRAP_ERROR; 720 return (EINVAL); 721 } 722 fdrop(fp, td); 723 return (0); 724} 725#endif /* NOTYET */ 726 727/* 728 * Connect the data socket to a named control socket node. 729 */ 730static int 731ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp) 732{ 733 struct sockaddr_ng *sap; 734 node_p farnode; 735 struct ngsock *priv; 736 int error; 737 item_p item; 738 739 /* If we are already connected, don't do it again */ 740 if (pcbp->sockdata != NULL) 741 return (EISCONN); 742 743 /* Find the target (victim) and check it doesn't already have a data 744 * socket. Also check it is a 'socket' type node. 745 * Use ng_package_data() and address_path() to do this. 746 */ 747 748 sap = (struct sockaddr_ng *) nam; 749 /* The item will hold the node reference */ 750 item = ng_package_data(NULL, NG_WAITOK); 751 if (item == NULL) { 752 return (ENOMEM); 753 } 754 if ((error = ng_address_path(NULL, item, sap->sg_data, 0))) 755 return (error); /* item is freed on failure */ 756 757 /* 758 * Extract node from item and free item. Remember we now have 759 * a reference on the node. The item holds it for us. 760 * when we free the item we release the reference. 761 */ 762 farnode = item->el_dest; /* shortcut */ 763 if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) { 764 NG_FREE_ITEM(item); /* drop the reference to the node */ 765 return (EINVAL); 766 } 767 priv = NG_NODE_PRIVATE(farnode); 768 if (priv->datasock != NULL) { 769 NG_FREE_ITEM(item); /* drop the reference to the node */ 770 return (EADDRINUSE); 771 } 772 773 /* 774 * Link the PCB and the private data struct. and note the extra 775 * reference. Drop the extra reference on the node. 776 */ 777 priv->datasock = pcbp; 778 pcbp->sockdata = priv; 779 priv->refs++; /* XXX possible race if it's being freed */ 780 NG_FREE_ITEM(item); /* drop the reference to the node */ 781 return (0); 782} 783 784/* 785 * Binding a socket means giving the corresponding node a name 786 */ 787static int 788ng_bind(struct sockaddr *nam, struct ngpcb *pcbp) 789{ 790 struct ngsock *const priv = pcbp->sockdata; 791 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam; 792 793 if (priv == NULL) { 794 TRAP_ERROR; 795 return (EINVAL); 796 } 797 if ((sap->sg_len < 4) 798 || (sap->sg_len > (NG_NODESIZ + 2)) 799 || (sap->sg_data[0] == '\0') 800 || (sap->sg_data[sap->sg_len - 3] != '\0')) { 801 TRAP_ERROR; 802 return (EINVAL); 803 } 804 return (ng_name_node(priv->node, sap->sg_data)); 805} 806 807/* 808 * Take a message and pass it up to the control socket associated 809 * with the node. 810 */ 811static int 812ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr) 813{ 814 struct socket *const so = pcbp->ng_socket; 815 struct mbuf *mdata; 816 int msglen; 817 818 /* Copy the message itself into an mbuf chain */ 819 msglen = sizeof(struct ng_mesg) + msg->header.arglen; 820 mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL); 821 822 /* Here we free the message, as we are the end of the line. 823 * We need to do that regardless of whether we got mbufs. */ 824 NG_FREE_MSG(msg); 825 826 if (mdata == NULL) { 827 TRAP_ERROR; 828 return (ENOBUFS); 829 } 830 831 /* Send it up to the socket */ 832 if (sbappendaddr(&so->so_rcv, 833 (struct sockaddr *) addr, mdata, NULL) == 0) { 834 TRAP_ERROR; 835 m_freem(mdata); 836 return (ENOBUFS); 837 } 838 sorwakeup(so); 839 return (0); 840} 841 842/*************************************************************** 843 Netgraph node 844***************************************************************/ 845 846/* 847 * You can only create new nodes from the socket end of things. 848 */ 849static int 850ngs_constructor(node_p nodep) 851{ 852 return (EINVAL); 853} 854 855/* 856 * We allow any hook to be connected to the node. 857 * There is no per-hook private information though. 858 */ 859static int 860ngs_newhook(node_p node, hook_p hook, const char *name) 861{ 862 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node)); 863 return (0); 864} 865 866/* 867 * if only one hook, allow read(2) and write(2) to work. 868 */ 869static int 870ngs_connect(hook_p hook) 871{ 872 node_p node = NG_HOOK_NODE(hook); 873 struct ngsock *priv = NG_NODE_PRIVATE(node); 874 875 if ((priv->datasock) 876 && (priv->datasock->ng_socket)) { 877 if (NG_NODE_NUMHOOKS(node) == 1) { 878 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED; 879 } else { 880 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED; 881 } 882 } 883 return (0); 884} 885 886/* 887 * Incoming messages get passed up to the control socket. 888 * Unless they are for us specifically (socket_type) 889 */ 890static int 891ngs_rcvmsg(node_p node, item_p item, hook_p lasthook) 892{ 893 struct ngsock *const priv = NG_NODE_PRIVATE(node); 894 struct ngpcb *const pcbp = priv->ctlsock; 895 struct sockaddr_ng *addr; 896 int addrlen; 897 int error = 0; 898 struct ng_mesg *msg; 899 ng_ID_t retaddr = NGI_RETADDR(item); 900 char retabuf[32]; 901 902 NGI_GET_MSG(item, msg); 903 NG_FREE_ITEM(item); /* we have all we need */ 904 905 /* Only allow mesgs to be passed if we have the control socket. 906 * Data sockets can only support the generic messages. */ 907 if (pcbp == NULL) { 908 TRAP_ERROR; 909 return (EINVAL); 910 } 911 912#ifdef TRACE_MESSAGES 913 printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n", 914 retaddr, 915 msg->header.typecookie, 916 msg->header.cmd, 917 msg->header.cmdstr, 918 msg->header.flags, 919 msg->header.token); 920#endif 921 922 if (msg->header.typecookie == NGM_SOCKET_COOKIE) { 923 switch (msg->header.cmd) { 924 case NGM_SOCK_CMD_NOLINGER: 925 priv->flags |= NGS_FLAG_NOLINGER; 926 break; 927 case NGM_SOCK_CMD_LINGER: 928 priv->flags &= ~NGS_FLAG_NOLINGER; 929 break; 930 default: 931 error = EINVAL; /* unknown command */ 932 } 933 /* Free the message and return */ 934 NG_FREE_MSG(msg); 935 return(error); 936 937 } 938 /* Get the return address into a sockaddr */ 939 sprintf(retabuf,"[%x]:", retaddr); 940 addrlen = strlen(retabuf); 941 MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH_PATH, M_NOWAIT); 942 if (addr == NULL) { 943 TRAP_ERROR; 944 return (ENOMEM); 945 } 946 addr->sg_len = addrlen + 3; 947 addr->sg_family = AF_NETGRAPH; 948 bcopy(retabuf, addr->sg_data, addrlen); 949 addr->sg_data[addrlen] = '\0'; 950 951 /* Send it up */ 952 error = ship_msg(pcbp, msg, addr); 953 FREE(addr, M_NETGRAPH_PATH); 954 return (error); 955} 956 957/* 958 * Receive data on a hook 959 */ 960static int 961ngs_rcvdata(hook_p hook, item_p item) 962{ 963 struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 964 struct ngpcb *const pcbp = priv->datasock; 965 struct socket *so; 966 struct sockaddr_ng *addr; 967 char *addrbuf[NG_HOOKSIZ + 4]; 968 int addrlen; 969 struct mbuf *m; 970 971 NGI_GET_M(item, m); 972 NG_FREE_ITEM(item); 973 /* If there is no data socket, black-hole it */ 974 if (pcbp == NULL) { 975 NG_FREE_M(m); 976 return (0); 977 } 978 so = pcbp->ng_socket; 979 980 /* Get the return address into a sockaddr. */ 981 addrlen = strlen(NG_HOOK_NAME(hook)); /* <= NG_HOOKSIZ - 1 */ 982 addr = (struct sockaddr_ng *) addrbuf; 983 addr->sg_len = addrlen + 3; 984 addr->sg_family = AF_NETGRAPH; 985 bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen); 986 addr->sg_data[addrlen] = '\0'; 987 988 /* Try to tell the socket which hook it came in on */ 989 if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) { 990 m_freem(m); 991 TRAP_ERROR; 992 return (ENOBUFS); 993 } 994 sorwakeup(so); 995 return (0); 996} 997 998/* 999 * Hook disconnection 1000 * 1001 * For this type, removal of the last link destroys the node 1002 * if the NOLINGER flag is set. 1003 */ 1004static int 1005ngs_disconnect(hook_p hook) 1006{ 1007 node_p node = NG_HOOK_NODE(hook); 1008 struct ngsock *const priv = NG_NODE_PRIVATE(node); 1009 1010 if ((priv->datasock) 1011 && (priv->datasock->ng_socket)) { 1012 if (NG_NODE_NUMHOOKS(node) == 1) { 1013 priv->datasock->ng_socket->so_state |= SS_ISCONNECTED; 1014 } else { 1015 priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED; 1016 } 1017 } 1018 1019 if ((priv->flags & NGS_FLAG_NOLINGER ) 1020 && (NG_NODE_NUMHOOKS(node) == 0) 1021 && (NG_NODE_IS_VALID(node))) { 1022 ng_rmnode_self(node); 1023 } 1024 return (0); 1025} 1026 1027/* 1028 * Do local shutdown processing. 1029 * In this case, that involves making sure the socket 1030 * knows we should be shutting down. 1031 */ 1032static int 1033ngs_shutdown(node_p node) 1034{ 1035 struct ngsock *const priv = NG_NODE_PRIVATE(node); 1036 struct ngpcb *const dpcbp = priv->datasock; 1037 struct ngpcb *const pcbp = priv->ctlsock; 1038 1039 if (dpcbp != NULL) { 1040 soisdisconnected(dpcbp->ng_socket); 1041 dpcbp->sockdata = NULL; 1042 priv->datasock = NULL; 1043 priv->refs--; 1044 } 1045 if (pcbp != NULL) { 1046 soisdisconnected(pcbp->ng_socket); 1047 pcbp->sockdata = NULL; 1048 priv->ctlsock = NULL; 1049 priv->refs--; 1050 } 1051 NG_NODE_SET_PRIVATE(node, NULL); 1052 NG_NODE_UNREF(node); 1053 mtx_destroy(&priv->mtx); 1054 FREE(priv, M_NETGRAPH_SOCK); 1055 return (0); 1056} 1057 1058static void 1059ng_socket_item_applied(void *context, int error) 1060{ 1061 struct ngsock *const priv = (struct ngsock *)context; 1062 1063 mtx_lock(&priv->mtx); 1064 priv->error = error; 1065 wakeup(priv); 1066 mtx_unlock(&priv->mtx); 1067 1068} 1069 1070static int 1071dummy_disconnect(struct socket *so) 1072{ 1073 return (0); 1074} 1075/* 1076 * Control and data socket type descriptors 1077 */ 1078 1079static struct pr_usrreqs ngc_usrreqs = { 1080 .pru_abort = NULL, 1081 .pru_attach = ngc_attach, 1082 .pru_bind = ngc_bind, 1083 .pru_connect = ngc_connect, 1084 .pru_detach = ngc_detach, 1085 .pru_disconnect = dummy_disconnect, 1086 .pru_peeraddr = NULL, 1087 .pru_send = ngc_send, 1088 .pru_shutdown = NULL, 1089 .pru_sockaddr = ng_setsockaddr, 1090}; 1091 1092static struct pr_usrreqs ngd_usrreqs = { 1093 .pru_abort = NULL, 1094 .pru_attach = ngd_attach, 1095 .pru_bind = NULL, 1096 .pru_connect = ngd_connect, 1097 .pru_detach = ngd_detach, 1098 .pru_disconnect = dummy_disconnect, 1099 .pru_peeraddr = NULL, 1100 .pru_send = ngd_send, 1101 .pru_shutdown = NULL, 1102 .pru_sockaddr ng_setsockaddr, 1103}; 1104 1105/* 1106 * Definitions of protocols supported in the NETGRAPH domain. 1107 */ 1108 1109extern struct domain ngdomain; /* stop compiler warnings */ 1110 1111static struct protosw ngsw[] = { 1112 { 1113 SOCK_DGRAM, /* protocol type */ 1114 &ngdomain, /* backpointer to domain */ 1115 NG_CONTROL, 1116 PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, /* flags */ 1117 0, 0, 0, 0, /* input, output, ctlinput, ctloutput */ 1118 NULL, /* ousrreq */ 1119 0, 0, 0, 0, /* init, fasttimeo, slowtimo, drain */ 1120 &ngc_usrreqs, /* usrreq table (above) */ 1121 /*{NULL}*/ /* pffh (protocol filter head?) */ 1122 }, 1123 { 1124 SOCK_DGRAM, /* protocol type */ 1125 &ngdomain, /* backpointer to domain */ 1126 NG_DATA, 1127 PR_ATOMIC | PR_ADDR, /* flags */ 1128 0, 0, 0, 0, /* input, output, ctlinput, ctloutput */ 1129 NULL, /* ousrreq() */ 1130 0, 0, 0, 0, /* init, fasttimeo, slowtimo, drain */ 1131 &ngd_usrreqs, /* usrreq table (above) */ 1132 /*{NULL}*/ /* pffh (protocol filter head?) */ 1133 } 1134}; 1135 1136struct domain ngdomain = { 1137 AF_NETGRAPH, 1138 "netgraph", 1139 NULL, /* init() */ 1140 NULL, /* externalise() */ 1141 NULL, /* dispose() */ 1142 ngsw, /* protosw entry */ 1143 &ngsw[sizeof(ngsw) / sizeof(ngsw[0])], /* Number of protosw entries */ 1144 NULL, /* next domain in list */ 1145 NULL, /* rtattach() */ 1146 0, /* arg to rtattach in bits */ 1147 0 /* maxrtkey */ 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 */ 1154static int 1155ngs_mod_event(module_t mod, int event, void *data) 1156{ 1157 int error = 0; 1158 1159 switch (event) { 1160 case MOD_LOAD: 1161 mtx_init(&ngsocketlist_mtx, "ng_socketlist", NULL, MTX_DEF); 1162 /* Register protocol domain */ 1163 net_add_domain(&ngdomain); 1164 break; 1165 case MOD_UNLOAD: 1166 /* Insure there are no open netgraph sockets */ 1167 if (!LIST_EMPTY(&ngsocklist)) { 1168 error = EBUSY; 1169 break; 1170 } 1171 1172#ifdef NOTYET 1173 if ((LIST_EMPTY(&ngsocklist)) && (typestruct.refs == 0)) { 1174 /* Unregister protocol domain XXX can't do this yet.. */ 1175 if ((error = net_rm_domain(&ngdomain)) != 0) 1176 break; 1177 mtx_destroy(&ngsocketlist_mtx); 1178 } else 1179#endif 1180 error = EBUSY; 1181 break; 1182 default: 1183 error = EOPNOTSUPP; 1184 break; 1185 } 1186 return (error); 1187} 1188 1189SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, ""); 1190SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA"); 1191SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, ""); 1192SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL"); 1193SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, ""); 1194 1195