1 2 /* 3 * ng_socket.c 4 * 5 * Copyright (c) 1996-1999 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Author: Julian Elischer <julian@freebsd.org> 38 * 39 * $FreeBSD$ 40 * $Whistle: ng_socket.c,v 1.28 1999/11/01 09:24:52 julian Exp $ 41 */ 42 43 /* 44 * Netgraph socket nodes 45 * 46 * There are two types of netgraph sockets, control and data. 47 * Control sockets have a netgraph node, but data sockets are 48 * parasitic on control sockets, and have no node of their own. 49 */ 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/domain.h> 54 #include <sys/errno.h> 55 #include <sys/kernel.h> 56 #include <sys/filedesc.h> 57 #include <sys/malloc.h> 58 #include <sys/queue.h> 59 #include <sys/mbuf.h> 60 #include <sys/protosw.h> 61 #include <sys/socket.h> 62 #include <sys/socketvar.h> 63 #include <sys/sysctl.h> 64 #ifdef NOTYET 65 #include <sys/vnode.h> 66 #endif 67 #include <netgraph/ng_message.h> 68 #include <netgraph/netgraph.h> 69 #include <netgraph/ng_socketvar.h> 70 #include <netgraph/ng_socket.h> 71 72 /* 73 * It's Ascii-art time! 74 * +-------------+ +-------------+ 75 * |socket (ctl)| |socket (data)| 76 * +-------------+ +-------------+ 77 * ^ ^ 78 * | | 79 * v v 80 * +-----------+ +-----------+ 81 * |pcb (ctl)| |pcb (data)| 82 * +-----------+ +-----------+ 83 * ^ ^ 84 * | | 85 * v v 86 * +--------------------------+ 87 * | Socket type private | 88 * | data | 89 * +--------------------------+ 90 * ^ 91 * | 92 * v 93 * +----------------+ 94 * | struct ng_node | 95 * +----------------+ 96 */ 97 98 /* Netgraph node methods */ 99 static ng_constructor_t ngs_constructor; 100 static ng_rcvmsg_t ngs_rcvmsg; 101 static ng_shutdown_t ngs_rmnode; 102 static ng_newhook_t ngs_newhook; 103 static ng_rcvdata_t ngs_rcvdata; 104 static ng_disconnect_t ngs_disconnect; 105 106 /* Internal methods */ 107 static int ng_attach_data(struct socket *so); 108 static int ng_attach_cntl(struct socket *so); 109 static int ng_attach_common(struct socket *so, int type); 110 static void ng_detach_common(struct ngpcb *pcbp, int type); 111 /*static int ng_internalize(struct mbuf *m, struct proc *p); */ 112 113 static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp); 114 static int ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp); 115 static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp); 116 117 static int ngs_mod_event(module_t mod, int event, void *data); 118 static int ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, 119 struct sockaddr_ng *addr); 120 121 /* Netgraph type descriptor */ 122 static struct ng_type typestruct = { 123 NG_VERSION, 124 NG_SOCKET_NODE_TYPE, 125 ngs_mod_event, 126 ngs_constructor, 127 ngs_rcvmsg, 128 ngs_rmnode, 129 ngs_newhook, 130 NULL, 131 NULL, 132 ngs_rcvdata, 133 ngs_rcvdata, 134 ngs_disconnect, 135 NULL 136 }; 137 NETGRAPH_INIT(socket, &typestruct); 138 139 /* Buffer space */ 140 static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */ 141 static u_long ngpdg_recvspace = 20 * 1024; 142 143 /* List of all sockets */ 144 LIST_HEAD(, ngpcb) ngsocklist; 145 146 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb) 147 148 /* If getting unexplained errors returned, set this to "Debugger("X"); */ 149 #ifndef TRAP_ERROR 150 #define TRAP_ERROR 151 #endif 152 153 /*************************************************************** 154 Control sockets 155 ***************************************************************/ 156 157 static int 158 ngc_attach(struct socket *so, int proto, struct proc *p) 159 { 160 struct ngpcb *const pcbp = sotongpcb(so); 161 162 if (suser(p)) 163 return (EPERM); 164 if (pcbp != NULL) 165 return (EISCONN); 166 return (ng_attach_cntl(so)); 167 } 168 169 static int 170 ngc_detach(struct socket *so) 171 { 172 struct ngpcb *const pcbp = sotongpcb(so); 173 174 if (pcbp == NULL) 175 return (EINVAL); 176 ng_detach_common(pcbp, NG_CONTROL); 177 return (0); 178 } 179 180 static int 181 ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 182 struct mbuf *control, struct proc *p) 183 { 184 struct ngpcb *const pcbp = sotongpcb(so); 185 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 186 struct ng_mesg *resp; 187 struct mbuf *m0; 188 char *msg, *path = NULL; 189 int len, error = 0; 190 191 if (pcbp == NULL) { 192 error = EINVAL; 193 goto release; 194 } 195 #ifdef NOTYET 196 if (control && (error = ng_internalize(control, p))) { 197 if (pcbp->sockdata == NULL) { 198 error = ENOTCONN; 199 goto release; 200 } 201 } 202 #else /* NOTYET */ 203 if (control) { 204 error = EINVAL; 205 goto release; 206 } 207 #endif /* NOTYET */ 208 209 /* Require destination as there may be >= 1 hooks on this node */ 210 if (addr == NULL) { 211 error = EDESTADDRREQ; 212 goto release; 213 } 214 215 /* Allocate an expendable buffer for the path, chop off 216 * the sockaddr header, and make sure it's NUL terminated */ 217 len = sap->sg_len - 2; 218 MALLOC(path, char *, len + 1, M_NETGRAPH, M_WAITOK); 219 if (path == NULL) { 220 error = ENOMEM; 221 goto release; 222 } 223 bcopy(sap->sg_data, path, len); 224 path[len] = '\0'; 225 226 /* Move the actual message out of mbufs into a linear buffer. 227 * Start by adding up the size of the data. (could use mh_len?) */ 228 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next) 229 len += m0->m_len; 230 231 /* Move the data into a linear buffer as well. Messages are not 232 * delivered in mbufs. */ 233 MALLOC(msg, char *, len + 1, M_NETGRAPH, M_WAITOK); 234 if (msg == NULL) { 235 error = ENOMEM; 236 goto release; 237 } 238 m_copydata(m, 0, len, msg); 239 240 /* The callee will free the msg when done. The addr is our business. */ 241 error = ng_send_msg(pcbp->sockdata->node, 242 (struct ng_mesg *) msg, path, &resp); 243 244 /* If the callee responded with a synchronous response, then put it 245 * back on the receive side of the socket; sap is source address. */ 246 if (error == 0 && resp != NULL) 247 error = ship_msg(pcbp, resp, sap); 248 249 release: 250 if (path != NULL) 251 FREE(path, M_NETGRAPH); 252 if (control != NULL) 253 m_freem(control); 254 if (m != NULL) 255 m_freem(m); 256 return (error); 257 } 258 259 static int 260 ngc_bind(struct socket *so, struct sockaddr *nam, struct proc *p) 261 { 262 struct ngpcb *const pcbp = sotongpcb(so); 263 264 if (pcbp == 0) 265 return (EINVAL); 266 return (ng_bind(nam, pcbp)); 267 } 268 269 static int 270 ngc_connect(struct socket *so, struct sockaddr *nam, struct proc *p) 271 { 272 struct ngpcb *const pcbp = sotongpcb(so); 273 274 if (pcbp == 0) 275 return (EINVAL); 276 return (ng_connect_cntl(nam, pcbp)); 277 } 278 279 /*************************************************************** 280 Data sockets 281 ***************************************************************/ 282 283 static int 284 ngd_attach(struct socket *so, int proto, struct proc *p) 285 { 286 struct ngpcb *const pcbp = sotongpcb(so); 287 288 if (pcbp != NULL) 289 return (EISCONN); 290 return (ng_attach_data(so)); 291 } 292 293 static int 294 ngd_detach(struct socket *so) 295 { 296 struct ngpcb *const pcbp = sotongpcb(so); 297 298 if (pcbp == NULL) 299 return (EINVAL); 300 ng_detach_common(pcbp, NG_DATA); 301 return (0); 302 } 303 304 static int 305 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 306 struct mbuf *control, struct proc *p) 307 { 308 struct ngpcb *const pcbp = sotongpcb(so); 309 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 310 meta_p mp = NULL; 311 int len, error; 312 hook_p hook = NULL; 313 char hookname[NG_HOOKLEN + 1]; 314 315 if ((pcbp == NULL) || (control != NULL)) { 316 error = EINVAL; 317 goto release; 318 } 319 if (pcbp->sockdata == NULL) { 320 error = ENOTCONN; 321 goto release; 322 } 323 /* 324 * If the user used any of these ways to not specify an address 325 * then handle specially. 326 */ 327 if ((sap == NULL) 328 || ((len = sap->sg_len) <= 2) 329 || (*sap->sg_data == '\0')) { 330 if (pcbp->sockdata->node->numhooks != 1) { 331 error = EDESTADDRREQ; 332 goto release; 333 } 334 /* 335 * if exactly one hook exists, just use it. 336 * Special case to allow write(2) to work on an ng_socket. 337 */ 338 hook = LIST_FIRST(&pcbp->sockdata->node->hooks); 339 } else { 340 if (len > NG_HOOKLEN) { 341 error = EINVAL; 342 goto release; 343 } 344 345 /* 346 * chop off the sockaddr header, and make sure it's NUL 347 * terminated 348 */ 349 bcopy(sap->sg_data, hookname, len); 350 hookname[len] = '\0'; 351 352 /* Find the correct hook from 'hookname' */ 353 LIST_FOREACH(hook, &pcbp->sockdata->node->hooks, hooks) { 354 if (strcmp(hookname, hook->name) == 0) 355 break; 356 } 357 if (hook == NULL) 358 error = EHOSTUNREACH; 359 } 360 361 /* Send data (OK if hook is NULL) */ 362 NG_SEND_DATA(error, hook, m, mp); /* makes m NULL */ 363 364 release: 365 if (control != NULL) 366 m_freem(control); 367 if (m != NULL) 368 m_freem(m); 369 return (error); 370 } 371 372 static int 373 ngd_connect(struct socket *so, struct sockaddr *nam, struct proc *p) 374 { 375 struct ngpcb *const pcbp = sotongpcb(so); 376 377 if (pcbp == 0) 378 return (EINVAL); 379 return (ng_connect_data(nam, pcbp)); 380 } 381 382 /* 383 * Used for both data and control sockets 384 */ 385 static int 386 ng_setsockaddr(struct socket *so, struct sockaddr **addr) 387 { 388 struct ngpcb *pcbp; 389 struct sockaddr_ng *sg; 390 int sg_len, namelen, s; 391 392 /* Why isn't sg_data a `char[1]' ? :-( */ 393 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1; 394 395 s = splnet(); 396 pcbp = sotongpcb(so); 397 if (pcbp == 0) { 398 splx(s); 399 return (EINVAL); 400 } 401 402 namelen = 0; /* silence compiler ! */ 403 404 if (pcbp->sockdata->node->name != NULL) 405 sg_len += namelen = strlen(pcbp->sockdata->node->name); 406 407 MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK); 408 bzero(sg, sg_len); 409 410 if (pcbp->sockdata->node->name != NULL) 411 bcopy(pcbp->sockdata->node->name, sg->sg_data, namelen); 412 splx(s); 413 414 sg->sg_len = sg_len; 415 sg->sg_family = AF_NETGRAPH; 416 *addr = (struct sockaddr *)sg; 417 418 return (0); 419 } 420 421 /* 422 * Attach a socket to it's protocol specific partner. 423 * For a control socket, actually create a netgraph node and attach 424 * to it as well. 425 */ 426 427 static int 428 ng_attach_cntl(struct socket *so) 429 { 430 struct ngsock *privdata; 431 struct ngpcb *pcbp; 432 int error; 433 434 /* Setup protocol control block */ 435 if ((error = ng_attach_common(so, NG_CONTROL)) != 0) 436 return (error); 437 pcbp = sotongpcb(so); 438 439 /* Allocate node private info */ 440 MALLOC(privdata, struct ngsock *, 441 sizeof(*privdata), M_NETGRAPH, M_WAITOK); 442 if (privdata == NULL) { 443 ng_detach_common(pcbp, NG_CONTROL); 444 return (ENOMEM); 445 } 446 bzero(privdata, sizeof(*privdata)); 447 448 /* Make the generic node components */ 449 if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) { 450 FREE(privdata, M_NETGRAPH); 451 ng_detach_common(pcbp, NG_CONTROL); 452 return (error); 453 } 454 privdata->node->private = privdata; 455 456 /* Link the pcb and the node private data */ 457 privdata->ctlsock = pcbp; 458 pcbp->sockdata = privdata; 459 privdata->refs++; 460 return (0); 461 } 462 463 static int 464 ng_attach_data(struct socket *so) 465 { 466 return(ng_attach_common(so, NG_DATA)); 467 } 468 469 /* 470 * Set up a socket protocol control block. 471 * This code is shared between control and data sockets. 472 */ 473 static int 474 ng_attach_common(struct socket *so, int type) 475 { 476 struct ngpcb *pcbp; 477 int error; 478 479 /* Standard socket setup stuff */ 480 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace); 481 if (error) 482 return (error); 483 484 /* Allocate the pcb */ 485 MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK); 486 if (pcbp == NULL) 487 return (ENOMEM); 488 bzero(pcbp, sizeof(*pcbp)); 489 pcbp->type = type; 490 491 /* Link the pcb and the socket */ 492 so->so_pcb = (caddr_t) pcbp; 493 pcbp->ng_socket = so; 494 495 /* Add the socket to linked list */ 496 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks); 497 return (0); 498 } 499 500 /* 501 * Disassociate the socket from it's protocol specific 502 * partner. If it's attached to a node's private data structure, 503 * then unlink from that too. If we were the last socket attached to it, 504 * then shut down the entire node. Shared code for control and data sockets. 505 */ 506 static void 507 ng_detach_common(struct ngpcb *pcbp, int which) 508 { 509 struct ngsock *sockdata; 510 511 if (pcbp->sockdata) { 512 sockdata = pcbp->sockdata; 513 pcbp->sockdata = NULL; 514 switch (which) { 515 case NG_CONTROL: 516 sockdata->ctlsock = NULL; 517 break; 518 case NG_DATA: 519 sockdata->datasock = NULL; 520 break; 521 default: 522 panic(__FUNCTION__); 523 } 524 if ((--sockdata->refs == 0) && (sockdata->node != NULL)) 525 ng_rmnode(sockdata->node); 526 } 527 pcbp->ng_socket->so_pcb = NULL; 528 pcbp->ng_socket = NULL; 529 LIST_REMOVE(pcbp, socks); 530 FREE(pcbp, M_PCB); 531 } 532 533 #ifdef NOTYET 534 /* 535 * File descriptors can be passed into a AF_NETGRAPH socket. 536 * Note, that file descriptors cannot be passed OUT. 537 * Only character device descriptors are accepted. 538 * Character devices are useful to connect a graph to a device, 539 * which after all is the purpose of this whole system. 540 */ 541 static int 542 ng_internalize(struct mbuf *control, struct proc *p) 543 { 544 struct filedesc *fdp = p->p_fd; 545 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 546 struct file *fp; 547 struct vnode *vn; 548 int oldfds; 549 int fd; 550 551 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || 552 cm->cmsg_len != control->m_len) { 553 TRAP_ERROR; 554 return (EINVAL); 555 } 556 557 /* Check there is only one FD. XXX what would more than one signify? */ 558 oldfds = (cm->cmsg_len - sizeof(*cm)) / sizeof(int); 559 if (oldfds != 1) { 560 TRAP_ERROR; 561 return (EINVAL); 562 } 563 564 /* Check that the FD given is legit. and change it to a pointer to a 565 * struct file. */ 566 fd = *(int *) (cm + 1); 567 if ((unsigned) fd >= fdp->fd_nfiles 568 || (fp = fdp->fd_ofiles[fd]) == NULL) { 569 return (EBADF); 570 } 571 572 /* Depending on what kind of resource it is, act differently. For 573 * devices, we treat it as a file. For a AF_NETGRAPH socket, 574 * shortcut straight to the node. */ 575 switch (fp->f_type) { 576 case DTYPE_VNODE: 577 vn = (struct vnode *) fp->f_data; 578 if (vn && (vn->v_type == VCHR)) { 579 /* for a VCHR, actually reference the FILE */ 580 fp->f_count++; 581 /* XXX then what :) */ 582 /* how to pass on to other modules? */ 583 } else { 584 TRAP_ERROR; 585 return (EINVAL); 586 } 587 break; 588 default: 589 TRAP_ERROR; 590 return (EINVAL); 591 } 592 return (0); 593 } 594 #endif /* NOTYET */ 595 596 /* 597 * Connect the data socket to a named control socket node. 598 */ 599 static int 600 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp) 601 { 602 struct sockaddr_ng *sap; 603 node_p farnode; 604 struct ngsock *sockdata; 605 int error; 606 607 /* If we are already connected, don't do it again */ 608 if (pcbp->sockdata != NULL) 609 return (EISCONN); 610 611 /* Find the target (victim) and check it doesn't already have a data 612 * socket. Also check it is a 'socket' type node. */ 613 sap = (struct sockaddr_ng *) nam; 614 if ((error = ng_path2node(NULL, sap->sg_data, &farnode, NULL, NULL))) 615 return (error); 616 617 if (strcmp(farnode->type->name, NG_SOCKET_NODE_TYPE) != 0) 618 return (EINVAL); 619 sockdata = farnode->private; 620 if (sockdata->datasock != NULL) 621 return (EADDRINUSE); 622 623 /* Link the PCB and the private data struct. and note the extra 624 * reference */ 625 sockdata->datasock = pcbp; 626 pcbp->sockdata = sockdata; 627 sockdata->refs++; 628 return (0); 629 } 630 631 /* 632 * Connect the existing control socket node to a named node:hook. 633 * The hook we use on this end is the same name as the remote node name. 634 */ 635 static int 636 ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp) 637 { 638 struct ngsock *const sockdata = pcbp->sockdata; 639 struct sockaddr_ng *sap; 640 char *node, *hook; 641 node_p farnode; 642 int rtn, error; 643 644 sap = (struct sockaddr_ng *) nam; 645 rtn = ng_path_parse(sap->sg_data, &node, NULL, &hook); 646 if (rtn < 0 || node == NULL || hook == NULL) { 647 TRAP_ERROR; 648 return (EINVAL); 649 } 650 farnode = ng_findname(sockdata->node, node); 651 if (farnode == NULL) { 652 TRAP_ERROR; 653 return (EADDRNOTAVAIL); 654 } 655 656 /* Connect, using a hook name the same as the far node name. */ 657 error = ng_con_nodes(sockdata->node, node, farnode, hook); 658 return error; 659 } 660 661 /* 662 * Binding a socket means giving the corresponding node a name 663 */ 664 static int 665 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp) 666 { 667 struct ngsock *const sockdata = pcbp->sockdata; 668 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam; 669 670 if (sockdata == NULL) { 671 TRAP_ERROR; 672 return (EINVAL); 673 } 674 if (sap->sg_len < 3 || sap->sg_data[sap->sg_len - 3] != '\0') { 675 TRAP_ERROR; 676 return (EINVAL); 677 } 678 return (ng_name_node(sockdata->node, sap->sg_data)); 679 } 680 681 /* 682 * Take a message and pass it up to the control socket associated 683 * with the node. 684 */ 685 static int 686 ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr) 687 { 688 struct socket *const so = pcbp->ng_socket; 689 struct mbuf *mdata; 690 int msglen; 691 692 /* Copy the message itself into an mbuf chain */ 693 msglen = sizeof(struct ng_mesg) + msg->header.arglen; 694 mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL); 695 696 /* Here we free the message, as we are the end of the line. 697 * We need to do that regardless of whether we got mbufs. */ 698 FREE(msg, M_NETGRAPH); 699 700 if (mdata == NULL) { 701 TRAP_ERROR; 702 return (ENOBUFS); 703 } 704 705 /* Send it up to the socket */ 706 if (sbappendaddr(&so->so_rcv, 707 (struct sockaddr *) addr, mdata, NULL) == 0) { 708 TRAP_ERROR; 709 m_freem(mdata); 710 return (ENOBUFS); 711 } 712 sorwakeup(so); 713 return (0); 714 } 715 716 /* 717 * You can only create new nodes from the socket end of things. 718 */ 719 static int 720 ngs_constructor(node_p *nodep) 721 { 722 return (EINVAL); 723 } 724 725 /* 726 * We allow any hook to be connected to the node. 727 * There is no per-hook private information though. 728 */ 729 static int 730 ngs_newhook(node_p node, hook_p hook, const char *name) 731 { 732 hook->private = node->private; 733 return (0); 734 } 735 736 /* 737 * Incoming messages get passed up to the control socket. 738 * Unless they are for us specifically (socket_type) 739 */ 740 static int 741 ngs_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, 742 struct ng_mesg **resp, hook_p lasthook) 743 { 744 struct ngsock *const sockdata = node->private; 745 struct ngpcb *const pcbp = sockdata->ctlsock; 746 struct sockaddr_ng *addr; 747 int addrlen; 748 int error = 0; 749 750 /* Only allow mesgs to be passed if we have the control socket. 751 * Data sockets can only support the generic messages. */ 752 if (pcbp == NULL) { 753 TRAP_ERROR; 754 return (EINVAL); 755 } 756 757 if (msg->header.typecookie == NGM_SOCKET_COOKIE) { 758 switch (msg->header.cmd) { 759 case NGM_SOCK_CMD_NOLINGER: 760 sockdata->flags |= NGS_FLAG_NOLINGER; 761 break; 762 case NGM_SOCK_CMD_LINGER: 763 sockdata->flags &= ~NGS_FLAG_NOLINGER; 764 break; 765 default: 766 error = EINVAL; /* unknown command */ 767 } 768 /* Free the message and return */ 769 FREE(msg, M_NETGRAPH); 770 return(error); 771 772 } 773 /* Get the return address into a sockaddr */ 774 if ((retaddr == NULL) || (*retaddr == '\0')) 775 retaddr = ""; 776 addrlen = strlen(retaddr); 777 MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH, M_NOWAIT); 778 if (addr == NULL) { 779 TRAP_ERROR; 780 return (ENOMEM); 781 } 782 addr->sg_len = addrlen + 3; 783 addr->sg_family = AF_NETGRAPH; 784 bcopy(retaddr, addr->sg_data, addrlen); 785 addr->sg_data[addrlen] = '\0'; 786 787 /* Send it up */ 788 error = ship_msg(pcbp, msg, addr); 789 FREE(addr, M_NETGRAPH); 790 return (error); 791 } 792 793 /* 794 * Receive data on a hook 795 */ 796 static int 797 ngs_rcvdata(hook_p hook, struct mbuf *m, meta_p meta, 798 struct mbuf **ret_m, meta_p *ret_meta) 799 { 800 struct ngsock *const sockdata = hook->node->private; 801 struct ngpcb *const pcbp = sockdata->datasock; 802 struct socket *so; 803 struct sockaddr_ng *addr; 804 char *addrbuf[NG_HOOKLEN + 1 + 4]; 805 int addrlen; 806 807 /* If there is no data socket, black-hole it */ 808 if (pcbp == NULL) { 809 NG_FREE_DATA(m, meta); 810 return (0); 811 } 812 so = pcbp->ng_socket; 813 814 /* Get the return address into a sockaddr. */ 815 addrlen = strlen(hook->name); /* <= NG_HOOKLEN */ 816 addr = (struct sockaddr_ng *) addrbuf; 817 addr->sg_len = addrlen + 3; 818 addr->sg_family = AF_NETGRAPH; 819 bcopy(hook->name, addr->sg_data, addrlen); 820 addr->sg_data[addrlen] = '\0'; 821 822 /* We have no use for the meta data, free/clear it now. */ 823 NG_FREE_META(meta); 824 825 /* Try to tell the socket which hook it came in on */ 826 if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) { 827 m_freem(m); 828 TRAP_ERROR; 829 return (ENOBUFS); 830 } 831 sorwakeup(so); 832 return (0); 833 } 834 835 /* 836 * Hook disconnection 837 * 838 * For this type, removal of the last link destroys the node 839 * if the NOLINGER flag is set. 840 */ 841 static int 842 ngs_disconnect(hook_p hook) 843 { 844 struct ngsock *const sockdata = hook->node->private; 845 846 if ((sockdata->flags & NGS_FLAG_NOLINGER ) 847 && (hook->node->numhooks == 0)) { 848 ng_rmnode(hook->node); 849 } 850 return (0); 851 } 852 853 /* 854 * Do local shutdown processing. 855 * In this case, that involves making sure the socket 856 * knows we should be shutting down. 857 */ 858 static int 859 ngs_rmnode(node_p node) 860 { 861 struct ngsock *const sockdata = node->private; 862 struct ngpcb *const dpcbp = sockdata->datasock; 863 struct ngpcb *const pcbp = sockdata->ctlsock; 864 865 ng_cutlinks(node); 866 ng_unname(node); 867 868 if (dpcbp != NULL) { 869 soisdisconnected(dpcbp->ng_socket); 870 dpcbp->sockdata = NULL; 871 sockdata->datasock = NULL; 872 sockdata->refs--; 873 } 874 if (pcbp != NULL) { 875 soisdisconnected(pcbp->ng_socket); 876 pcbp->sockdata = NULL; 877 sockdata->ctlsock = NULL; 878 sockdata->refs--; 879 } 880 node->private = NULL; 881 ng_unref(node); 882 FREE(sockdata, M_NETGRAPH); 883 return (0); 884 } 885 886 /* 887 * Control and data socket type descriptors 888 */ 889 890 static struct pr_usrreqs ngc_usrreqs = { 891 NULL, /* abort */ 892 pru_accept_notsupp, 893 ngc_attach, 894 ngc_bind, 895 ngc_connect, 896 pru_connect2_notsupp, 897 pru_control_notsupp, 898 ngc_detach, 899 NULL, /* disconnect */ 900 pru_listen_notsupp, 901 NULL, /* setpeeraddr */ 902 pru_rcvd_notsupp, 903 pru_rcvoob_notsupp, 904 ngc_send, 905 pru_sense_null, 906 NULL, /* shutdown */ 907 ng_setsockaddr, 908 sosend, 909 soreceive, 910 sopoll 911 }; 912 913 static struct pr_usrreqs ngd_usrreqs = { 914 NULL, /* abort */ 915 pru_accept_notsupp, 916 ngd_attach, 917 NULL, /* bind */ 918 ngd_connect, 919 pru_connect2_notsupp, 920 pru_control_notsupp, 921 ngd_detach, 922 NULL, /* disconnect */ 923 pru_listen_notsupp, 924 NULL, /* setpeeraddr */ 925 pru_rcvd_notsupp, 926 pru_rcvoob_notsupp, 927 ngd_send, 928 pru_sense_null, 929 NULL, /* shutdown */ 930 ng_setsockaddr, 931 sosend, 932 soreceive, 933 sopoll 934 }; 935 936 /* 937 * Definitions of protocols supported in the NETGRAPH domain. 938 */ 939 940 extern struct domain ngdomain; /* stop compiler warnings */ 941 942 static struct protosw ngsw[] = { 943 { 944 SOCK_DGRAM, 945 &ngdomain, 946 NG_CONTROL, 947 PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, 948 0, 0, 0, 0, 949 NULL, 950 0, 0, 0, 0, 951 &ngc_usrreqs 952 }, 953 { 954 SOCK_DGRAM, 955 &ngdomain, 956 NG_DATA, 957 PR_ATOMIC | PR_ADDR, 958 0, 0, 0, 0, 959 NULL, 960 0, 0, 0, 0, 961 &ngd_usrreqs 962 } 963 }; 964 965 struct domain ngdomain = { 966 AF_NETGRAPH, 967 "netgraph", 968 0, 969 NULL, 970 NULL, 971 ngsw, 972 &ngsw[sizeof(ngsw) / sizeof(ngsw[0])], 973 0, 974 NULL, 975 0, 976 0 977 }; 978 979 /* 980 * Handle loading and unloading for this node type 981 * This is to handle auxiliary linkages (e.g protocol domain addition). 982 */ 983 static int 984 ngs_mod_event(module_t mod, int event, void *data) 985 { 986 int error = 0; 987 988 switch (event) { 989 case MOD_LOAD: 990 /* Register protocol domain */ 991 net_add_domain(&ngdomain); 992 break; 993 case MOD_UNLOAD: 994 /* Insure there are no open netgraph sockets */ 995 if (!LIST_EMPTY(&ngsocklist)) { 996 error = EBUSY; 997 break; 998 } 999 1000 #ifdef NOTYET 1001 /* Unregister protocol domain XXX can't do this yet.. */ 1002 if ((error = net_rm_domain(&ngdomain)) != 0) 1003 break; 1004 #else 1005 error = EBUSY; 1006 #endif 1007 break; 1008 default: 1009 error = EOPNOTSUPP; 1010 break; 1011 } 1012 return (error); 1013 } 1014 1015 SYSCTL_NODE(_net, AF_NETGRAPH, graph, CTLFLAG_RW, 0, "netgraph Family"); 1016 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, ""); 1017 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA"); 1018 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, ""); 1019 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL"); 1020 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, ""); 1021 1022