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