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: src/sys/netgraph/ng_socket.c,v 1.11.2.6 2002/07/02 22:17:18 archie Exp $ 40 * $DragonFly: src/sys/netgraph/socket/ng_socket.c,v 1.16 2008/01/06 16:55:52 swildner Exp $ 41 * $Whistle: ng_socket.c,v 1.28 1999/11/01 09:24:52 julian Exp $ 42 */ 43 44 /* 45 * Netgraph socket nodes 46 * 47 * There are two types of netgraph sockets, control and data. 48 * Control sockets have a netgraph node, but data sockets are 49 * parasitic on control sockets, and have no node of their own. 50 */ 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/proc.h> 55 #include <sys/domain.h> 56 #include <sys/errno.h> 57 #include <sys/kernel.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 #include <sys/thread2.h> 67 #ifdef NOTYET 68 #include <sys/vnode.h> 69 #endif 70 #include <netgraph/ng_message.h> 71 #include <netgraph/netgraph.h> 72 #include "ng_socketvar.h" 73 #include "ng_socket.h" 74 75 /* 76 * It's Ascii-art time! 77 * +-------------+ +-------------+ 78 * |socket (ctl)| |socket (data)| 79 * +-------------+ +-------------+ 80 * ^ ^ 81 * | | 82 * v v 83 * +-----------+ +-----------+ 84 * |pcb (ctl)| |pcb (data)| 85 * +-----------+ +-----------+ 86 * ^ ^ 87 * | | 88 * v v 89 * +--------------------------+ 90 * | Socket type private | 91 * | data | 92 * +--------------------------+ 93 * ^ 94 * | 95 * v 96 * +----------------+ 97 * | struct ng_node | 98 * +----------------+ 99 */ 100 101 /* Netgraph node methods */ 102 static ng_constructor_t ngs_constructor; 103 static ng_rcvmsg_t ngs_rcvmsg; 104 static ng_shutdown_t ngs_rmnode; 105 static ng_newhook_t ngs_newhook; 106 static ng_rcvdata_t ngs_rcvdata; 107 static ng_disconnect_t ngs_disconnect; 108 109 /* Internal methods */ 110 static int ng_attach_data(struct socket *so); 111 static int ng_attach_cntl(struct socket *so); 112 static int ng_attach_common(struct socket *so, int type); 113 static void ng_detach_common(struct ngpcb *pcbp, int type); 114 /*static int ng_internalize(struct mbuf *m, struct thread *td); */ 115 116 static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp); 117 static int ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp); 118 static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp); 119 120 static int ngs_mod_event(module_t mod, int event, void *data); 121 static int ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, 122 struct sockaddr_ng *addr); 123 124 /* Netgraph type descriptor */ 125 static struct ng_type typestruct = { 126 NG_VERSION, 127 NG_SOCKET_NODE_TYPE, 128 ngs_mod_event, 129 ngs_constructor, 130 ngs_rcvmsg, 131 ngs_rmnode, 132 ngs_newhook, 133 NULL, 134 NULL, 135 ngs_rcvdata, 136 ngs_rcvdata, 137 ngs_disconnect, 138 NULL 139 }; 140 NETGRAPH_INIT(socket, &typestruct); 141 142 /* Buffer space */ 143 static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */ 144 static u_long ngpdg_recvspace = 20 * 1024; 145 146 /* List of all sockets */ 147 LIST_HEAD(, ngpcb) ngsocklist; 148 149 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb) 150 151 /* If getting unexplained errors returned, set this to "Debugger("X"); */ 152 #ifndef TRAP_ERROR 153 #define TRAP_ERROR 154 #endif 155 156 /*************************************************************** 157 Control sockets 158 ***************************************************************/ 159 160 static int 161 ngc_attach(struct socket *so, int proto, struct pru_attach_info *ai) 162 { 163 struct ngpcb *const pcbp = sotongpcb(so); 164 165 if (suser_cred(ai->p_ucred, NULL_CRED_OKAY) != 0) 166 return (EPERM); 167 if (pcbp != NULL) 168 return (EISCONN); 169 return (ng_attach_cntl(so)); 170 } 171 172 static int 173 ngc_detach(struct socket *so) 174 { 175 struct ngpcb *const pcbp = sotongpcb(so); 176 177 if (pcbp == NULL) 178 return (EINVAL); 179 ng_detach_common(pcbp, NG_CONTROL); 180 return (0); 181 } 182 183 static int 184 ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 185 struct mbuf *control, struct thread *td) 186 { 187 struct ngpcb *const pcbp = sotongpcb(so); 188 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 189 struct ng_mesg *resp; 190 struct mbuf *m0; 191 char *msg, *path = NULL; 192 int len, error = 0; 193 194 if (pcbp == NULL) { 195 error = EINVAL; 196 goto release; 197 } 198 #ifdef NOTYET 199 if (control && (error = ng_internalize(control, p))) { 200 if (pcbp->sockdata == NULL) { 201 error = ENOTCONN; 202 goto release; 203 } 204 } 205 #else /* NOTYET */ 206 if (control) { 207 error = EINVAL; 208 goto release; 209 } 210 #endif /* NOTYET */ 211 212 /* Require destination as there may be >= 1 hooks on this node */ 213 if (addr == NULL) { 214 error = EDESTADDRREQ; 215 goto release; 216 } 217 218 /* Allocate an expendable buffer for the path, chop off 219 * the sockaddr header, and make sure it's NUL terminated */ 220 len = sap->sg_len - 2; 221 MALLOC(path, char *, len + 1, M_NETGRAPH, M_WAITOK); 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 m_copydata(m, 0, len, msg); 234 235 /* The callee will free the msg when done. The addr is our business. */ 236 error = ng_send_msg(pcbp->sockdata->node, 237 (struct ng_mesg *) msg, path, &resp); 238 239 /* If the callee responded with a synchronous response, then put it 240 * back on the receive side of the socket; sap is source address. */ 241 if (error == 0 && resp != NULL) 242 error = ship_msg(pcbp, resp, sap); 243 244 release: 245 if (path != NULL) 246 FREE(path, M_NETGRAPH); 247 if (control != NULL) 248 m_freem(control); 249 if (m != NULL) 250 m_freem(m); 251 return (error); 252 } 253 254 static int 255 ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 256 { 257 struct ngpcb *const pcbp = sotongpcb(so); 258 259 if (pcbp == 0) 260 return (EINVAL); 261 return (ng_bind(nam, pcbp)); 262 } 263 264 static int 265 ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 266 { 267 struct ngpcb *const pcbp = sotongpcb(so); 268 269 if (pcbp == 0) 270 return (EINVAL); 271 return (ng_connect_cntl(nam, pcbp)); 272 } 273 274 /*************************************************************** 275 Data sockets 276 ***************************************************************/ 277 278 static int 279 ngd_attach(struct socket *so, int proto, struct pru_attach_info *ai) 280 { 281 struct ngpcb *const pcbp = sotongpcb(so); 282 283 if (pcbp != NULL) 284 return (EISCONN); 285 return (ng_attach_data(so)); 286 } 287 288 static int 289 ngd_detach(struct socket *so) 290 { 291 struct ngpcb *const pcbp = sotongpcb(so); 292 293 if (pcbp == NULL) 294 return (EINVAL); 295 ng_detach_common(pcbp, NG_DATA); 296 return (0); 297 } 298 299 static int 300 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 301 struct mbuf *control, struct thread *td) 302 { 303 struct ngpcb *const pcbp = sotongpcb(so); 304 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 305 meta_p mp = NULL; 306 int len, error; 307 hook_p hook = NULL; 308 char hookname[NG_HOOKSIZ]; 309 310 if ((pcbp == NULL) || (control != NULL)) { 311 error = EINVAL; 312 goto release; 313 } 314 if (pcbp->sockdata == NULL) { 315 error = ENOTCONN; 316 goto release; 317 } 318 /* 319 * If the user used any of these ways to not specify an address 320 * then handle specially. 321 */ 322 if ((sap == NULL) 323 || ((len = sap->sg_len - 2) <= 0) 324 || (*sap->sg_data == '\0')) { 325 if (pcbp->sockdata->node->numhooks != 1) { 326 error = EDESTADDRREQ; 327 goto release; 328 } 329 /* 330 * if exactly one hook exists, just use it. 331 * Special case to allow write(2) to work on an ng_socket. 332 */ 333 hook = LIST_FIRST(&pcbp->sockdata->node->hooks); 334 } else { 335 if (len >= NG_HOOKSIZ) { 336 error = EINVAL; 337 goto release; 338 } 339 340 /* 341 * chop off the sockaddr header, and make sure it's NUL 342 * terminated 343 */ 344 bcopy(sap->sg_data, hookname, len); 345 hookname[len] = '\0'; 346 347 /* Find the correct hook from 'hookname' */ 348 LIST_FOREACH(hook, &pcbp->sockdata->node->hooks, hooks) { 349 if (strcmp(hookname, hook->name) == 0) 350 break; 351 } 352 if (hook == NULL) 353 error = EHOSTUNREACH; 354 } 355 356 /* Send data (OK if hook is NULL) */ 357 NG_SEND_DATA(error, hook, m, mp); /* makes m NULL */ 358 359 release: 360 if (control != NULL) 361 m_freem(control); 362 if (m != NULL) 363 m_freem(m); 364 return (error); 365 } 366 367 static int 368 ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 369 { 370 struct ngpcb *const pcbp = sotongpcb(so); 371 372 if (pcbp == 0) 373 return (EINVAL); 374 return (ng_connect_data(nam, pcbp)); 375 } 376 377 /* 378 * Used for both data and control sockets 379 */ 380 static int 381 ng_setsockaddr(struct socket *so, struct sockaddr **addr) 382 { 383 struct ngpcb *pcbp; 384 struct sockaddr_ng *sg; 385 int sg_len, namelen; 386 387 /* Why isn't sg_data a `char[1]' ? :-( */ 388 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1; 389 390 crit_enter(); 391 pcbp = sotongpcb(so); 392 if ((pcbp == 0) || (pcbp->sockdata == NULL)) { 393 crit_exit(); 394 return (EINVAL); 395 } 396 397 namelen = 0; /* silence compiler ! */ 398 399 if (pcbp->sockdata->node->name != NULL) 400 sg_len += namelen = strlen(pcbp->sockdata->node->name); 401 402 MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK | M_ZERO); 403 404 if (pcbp->sockdata->node->name != NULL) 405 bcopy(pcbp->sockdata->node->name, sg->sg_data, namelen); 406 crit_exit(); 407 408 sg->sg_len = sg_len; 409 sg->sg_family = AF_NETGRAPH; 410 *addr = (struct sockaddr *)sg; 411 412 return (0); 413 } 414 415 /* 416 * Attach a socket to it's protocol specific partner. 417 * For a control socket, actually create a netgraph node and attach 418 * to it as well. 419 */ 420 421 static int 422 ng_attach_cntl(struct socket *so) 423 { 424 struct ngsock *privdata; 425 struct ngpcb *pcbp; 426 int error; 427 428 /* Setup protocol control block */ 429 if ((error = ng_attach_common(so, NG_CONTROL)) != 0) 430 return (error); 431 pcbp = sotongpcb(so); 432 433 /* Allocate node private info */ 434 MALLOC(privdata, struct ngsock *, 435 sizeof(*privdata), M_NETGRAPH, M_WAITOK | M_ZERO); 436 437 /* Make the generic node components */ 438 if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) { 439 FREE(privdata, M_NETGRAPH); 440 ng_detach_common(pcbp, NG_CONTROL); 441 return (error); 442 } 443 privdata->node->private = privdata; 444 445 /* Link the pcb and the node private data */ 446 privdata->ctlsock = pcbp; 447 pcbp->sockdata = privdata; 448 privdata->refs++; 449 return (0); 450 } 451 452 static int 453 ng_attach_data(struct socket *so) 454 { 455 return(ng_attach_common(so, NG_DATA)); 456 } 457 458 /* 459 * Set up a socket protocol control block. 460 * This code is shared between control and data sockets. 461 */ 462 static int 463 ng_attach_common(struct socket *so, int type) 464 { 465 struct ngpcb *pcbp; 466 int error; 467 468 /* Standard socket setup stuff */ 469 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace, NULL); 470 if (error) 471 return (error); 472 473 /* Allocate the pcb */ 474 MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO); 475 pcbp->type = type; 476 477 /* Link the pcb and the socket */ 478 so->so_pcb = (caddr_t) pcbp; 479 pcbp->ng_socket = so; 480 481 /* Add the socket to linked list */ 482 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks); 483 return (0); 484 } 485 486 /* 487 * Disassociate the socket from it's protocol specific 488 * partner. If it's attached to a node's private data structure, 489 * then unlink from that too. If we were the last socket attached to it, 490 * then shut down the entire node. Shared code for control and data sockets. 491 */ 492 static void 493 ng_detach_common(struct ngpcb *pcbp, int which) 494 { 495 struct ngsock *sockdata; 496 497 if (pcbp->sockdata) { 498 sockdata = pcbp->sockdata; 499 pcbp->sockdata = NULL; 500 switch (which) { 501 case NG_CONTROL: 502 sockdata->ctlsock = NULL; 503 break; 504 case NG_DATA: 505 sockdata->datasock = NULL; 506 break; 507 default: 508 panic(__func__); 509 } 510 if ((--sockdata->refs == 0) && (sockdata->node != NULL)) 511 ng_rmnode(sockdata->node); 512 } 513 pcbp->ng_socket->so_pcb = NULL; 514 pcbp->ng_socket = NULL; 515 LIST_REMOVE(pcbp, socks); 516 FREE(pcbp, M_PCB); 517 } 518 519 #ifdef NOTYET 520 /* 521 * File descriptors can be passed into a AF_NETGRAPH socket. 522 * Note, that file descriptors cannot be passed OUT. 523 * Only character device descriptors are accepted. 524 * Character devices are useful to connect a graph to a device, 525 * which after all is the purpose of this whole system. 526 */ 527 static int 528 ng_internalize(struct mbuf *control, struct thread *td) 529 { 530 struct filedesc *fdp = p->p_fd; 531 const struct cmsghdr *cm = mtod(control, const struct cmsghdr *); 532 struct file *fp; 533 struct vnode *vn; 534 int oldfds; 535 int fd; 536 537 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || 538 cm->cmsg_len != control->m_len) { 539 TRAP_ERROR; 540 return (EINVAL); 541 } 542 543 /* Check there is only one FD. XXX what would more than one signify? */ 544 oldfds = (cm->cmsg_len - sizeof(*cm)) / sizeof(int); 545 if (oldfds != 1) { 546 TRAP_ERROR; 547 return (EINVAL); 548 } 549 550 /* Check that the FD given is legit. and change it to a pointer to a 551 * struct file. */ 552 fd = *(int *) (cm + 1); 553 if ((unsigned) fd >= fdp->fd_nfiles 554 || (fp = fdp->fd_files[fd].fp) == NULL) { 555 return (EBADF); 556 } 557 558 /* Depending on what kind of resource it is, act differently. For 559 * devices, we treat it as a file. For a AF_NETGRAPH socket, 560 * shortcut straight to the node. */ 561 switch (fp->f_type) { 562 case DTYPE_VNODE: 563 vn = (struct vnode *) fp->f_data; 564 if (vn && (vn->v_type == VCHR)) { 565 /* for a VCHR, actually reference the FILE */ 566 fp->f_count++; 567 /* XXX then what :) */ 568 /* how to pass on to other modules? */ 569 } else { 570 TRAP_ERROR; 571 return (EINVAL); 572 } 573 break; 574 default: 575 TRAP_ERROR; 576 return (EINVAL); 577 } 578 return (0); 579 } 580 #endif /* NOTYET */ 581 582 /* 583 * Connect the data socket to a named control socket node. 584 */ 585 static int 586 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp) 587 { 588 struct sockaddr_ng *sap; 589 node_p farnode; 590 struct ngsock *sockdata; 591 int error; 592 593 /* If we are already connected, don't do it again */ 594 if (pcbp->sockdata != NULL) 595 return (EISCONN); 596 597 /* Find the target (victim) and check it doesn't already have a data 598 * socket. Also check it is a 'socket' type node. */ 599 sap = (struct sockaddr_ng *) nam; 600 if ((error = ng_path2node(NULL, sap->sg_data, &farnode, NULL))) 601 return (error); 602 603 if (strcmp(farnode->type->name, NG_SOCKET_NODE_TYPE) != 0) 604 return (EINVAL); 605 sockdata = farnode->private; 606 if (sockdata->datasock != NULL) 607 return (EADDRINUSE); 608 609 /* Link the PCB and the private data struct. and note the extra 610 * reference */ 611 sockdata->datasock = pcbp; 612 pcbp->sockdata = sockdata; 613 sockdata->refs++; 614 return (0); 615 } 616 617 /* 618 * Connect the existing control socket node to a named node:hook. 619 * The hook we use on this end is the same name as the remote node name. 620 */ 621 static int 622 ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp) 623 { 624 struct ngsock *const sockdata = pcbp->sockdata; 625 struct sockaddr_ng *sap; 626 char *node, *hook; 627 node_p farnode; 628 int rtn, error; 629 630 sap = (struct sockaddr_ng *) nam; 631 rtn = ng_path_parse(sap->sg_data, &node, NULL, &hook); 632 if (rtn < 0 || node == NULL || hook == NULL) { 633 TRAP_ERROR; 634 return (EINVAL); 635 } 636 farnode = ng_findname(sockdata->node, node); 637 if (farnode == NULL) { 638 TRAP_ERROR; 639 return (EADDRNOTAVAIL); 640 } 641 642 /* Connect, using a hook name the same as the far node name. */ 643 error = ng_con_nodes(sockdata->node, node, farnode, hook); 644 return error; 645 } 646 647 /* 648 * Binding a socket means giving the corresponding node a name 649 */ 650 static int 651 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp) 652 { 653 struct ngsock *const sockdata = pcbp->sockdata; 654 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam; 655 656 if (sockdata == NULL) { 657 TRAP_ERROR; 658 return (EINVAL); 659 } 660 if (sap->sg_len < 3 || sap->sg_data[sap->sg_len - 3] != '\0') { 661 TRAP_ERROR; 662 return (EINVAL); 663 } 664 return (ng_name_node(sockdata->node, sap->sg_data)); 665 } 666 667 /* 668 * Take a message and pass it up to the control socket associated 669 * with the node. 670 */ 671 static int 672 ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr) 673 { 674 struct socket *const so = pcbp->ng_socket; 675 struct mbuf *mdata; 676 int msglen; 677 678 /* Copy the message itself into an mbuf chain */ 679 msglen = sizeof(struct ng_mesg) + msg->header.arglen; 680 mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL); 681 682 /* Here we free the message, as we are the end of the line. 683 * We need to do that regardless of whether we got mbufs. */ 684 FREE(msg, M_NETGRAPH); 685 686 if (mdata == NULL) { 687 TRAP_ERROR; 688 return (ENOBUFS); 689 } 690 691 /* Send it up to the socket */ 692 if (ssb_appendaddr(&so->so_rcv, 693 (struct sockaddr *) addr, mdata, NULL) == 0) { 694 TRAP_ERROR; 695 m_freem(mdata); 696 return (ENOBUFS); 697 } 698 sorwakeup(so); 699 return (0); 700 } 701 702 /* 703 * You can only create new nodes from the socket end of things. 704 */ 705 static int 706 ngs_constructor(node_p *nodep) 707 { 708 return (EINVAL); 709 } 710 711 /* 712 * We allow any hook to be connected to the node. 713 * There is no per-hook private information though. 714 */ 715 static int 716 ngs_newhook(node_p node, hook_p hook, const char *name) 717 { 718 hook->private = node->private; 719 return (0); 720 } 721 722 /* 723 * Incoming messages get passed up to the control socket. 724 * Unless they are for us specifically (socket_type) 725 */ 726 static int 727 ngs_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, 728 struct ng_mesg **resp) 729 { 730 struct ngsock *const sockdata = node->private; 731 struct ngpcb *const pcbp = sockdata->ctlsock; 732 struct sockaddr_ng *addr; 733 int addrlen; 734 int error = 0; 735 736 /* Only allow mesgs to be passed if we have the control socket. 737 * Data sockets can only support the generic messages. */ 738 if (pcbp == NULL) { 739 TRAP_ERROR; 740 return (EINVAL); 741 } 742 743 if (msg->header.typecookie == NGM_SOCKET_COOKIE) { 744 switch (msg->header.cmd) { 745 case NGM_SOCK_CMD_NOLINGER: 746 sockdata->flags |= NGS_FLAG_NOLINGER; 747 break; 748 case NGM_SOCK_CMD_LINGER: 749 sockdata->flags &= ~NGS_FLAG_NOLINGER; 750 break; 751 default: 752 error = EINVAL; /* unknown command */ 753 } 754 /* Free the message and return */ 755 FREE(msg, M_NETGRAPH); 756 return(error); 757 758 } 759 /* Get the return address into a sockaddr */ 760 if ((retaddr == NULL) || (*retaddr == '\0')) 761 retaddr = ""; 762 addrlen = strlen(retaddr); 763 MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH, M_NOWAIT); 764 if (addr == NULL) { 765 TRAP_ERROR; 766 return (ENOMEM); 767 } 768 addr->sg_len = addrlen + 3; 769 addr->sg_family = AF_NETGRAPH; 770 bcopy(retaddr, addr->sg_data, addrlen); 771 addr->sg_data[addrlen] = '\0'; 772 773 /* Send it up */ 774 error = ship_msg(pcbp, msg, addr); 775 FREE(addr, M_NETGRAPH); 776 return (error); 777 } 778 779 /* 780 * Receive data on a hook 781 */ 782 static int 783 ngs_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 784 { 785 struct ngsock *const sockdata = hook->node->private; 786 struct ngpcb *const pcbp = sockdata->datasock; 787 struct socket *so; 788 struct sockaddr_ng *addr; 789 char *addrbuf[NG_HOOKSIZ + 4]; 790 int addrlen; 791 792 /* If there is no data socket, black-hole it */ 793 if (pcbp == NULL) { 794 NG_FREE_DATA(m, meta); 795 return (0); 796 } 797 so = pcbp->ng_socket; 798 799 /* Get the return address into a sockaddr. */ 800 addrlen = strlen(hook->name); /* <= NG_HOOKSIZ - 1 */ 801 addr = (struct sockaddr_ng *) addrbuf; 802 addr->sg_len = addrlen + 3; 803 addr->sg_family = AF_NETGRAPH; 804 bcopy(hook->name, addr->sg_data, addrlen); 805 addr->sg_data[addrlen] = '\0'; 806 807 /* We have no use for the meta data, free/clear it now. */ 808 NG_FREE_META(meta); 809 810 /* Try to tell the socket which hook it came in on */ 811 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) { 812 m_freem(m); 813 TRAP_ERROR; 814 return (ENOBUFS); 815 } 816 sorwakeup(so); 817 return (0); 818 } 819 820 /* 821 * Hook disconnection 822 * 823 * For this type, removal of the last link destroys the node 824 * if the NOLINGER flag is set. 825 */ 826 static int 827 ngs_disconnect(hook_p hook) 828 { 829 struct ngsock *const sockdata = hook->node->private; 830 831 if ((sockdata->flags & NGS_FLAG_NOLINGER ) 832 && (hook->node->numhooks == 0)) { 833 ng_rmnode(hook->node); 834 } 835 return (0); 836 } 837 838 /* 839 * Do local shutdown processing. 840 * In this case, that involves making sure the socket 841 * knows we should be shutting down. 842 */ 843 static int 844 ngs_rmnode(node_p node) 845 { 846 struct ngsock *const sockdata = node->private; 847 struct ngpcb *const dpcbp = sockdata->datasock; 848 struct ngpcb *const pcbp = sockdata->ctlsock; 849 850 ng_cutlinks(node); 851 ng_unname(node); 852 853 if (dpcbp != NULL) { 854 soisdisconnected(dpcbp->ng_socket); 855 dpcbp->sockdata = NULL; 856 sockdata->datasock = NULL; 857 sockdata->refs--; 858 } 859 if (pcbp != NULL) { 860 soisdisconnected(pcbp->ng_socket); 861 pcbp->sockdata = NULL; 862 sockdata->ctlsock = NULL; 863 sockdata->refs--; 864 } 865 node->private = NULL; 866 ng_unref(node); 867 FREE(sockdata, M_NETGRAPH); 868 return (0); 869 } 870 871 /* 872 * Control and data socket type descriptors 873 */ 874 875 static struct pr_usrreqs ngc_usrreqs = { 876 .pru_abort = NULL, 877 .pru_accept = pru_accept_notsupp, 878 .pru_attach = ngc_attach, 879 .pru_bind = ngc_bind, 880 .pru_connect = ngc_connect, 881 .pru_connect2 = pru_connect2_notsupp, 882 .pru_control = pru_control_notsupp, 883 .pru_detach = ngc_detach, 884 .pru_disconnect = NULL, 885 .pru_listen = pru_listen_notsupp, 886 .pru_peeraddr = NULL, 887 .pru_rcvd = pru_rcvd_notsupp, 888 .pru_rcvoob = pru_rcvoob_notsupp, 889 .pru_send = ngc_send, 890 .pru_sense = pru_sense_null, 891 .pru_shutdown = NULL, 892 .pru_sockaddr = ng_setsockaddr, 893 .pru_sosend = sosend, 894 .pru_soreceive = soreceive, 895 .pru_sopoll = sopoll 896 }; 897 898 static struct pr_usrreqs ngd_usrreqs = { 899 .pru_abort = NULL, 900 .pru_accept = pru_accept_notsupp, 901 .pru_attach = ngd_attach, 902 .pru_bind = NULL, 903 .pru_connect = ngd_connect, 904 .pru_connect2 = pru_connect2_notsupp, 905 .pru_control = pru_control_notsupp, 906 .pru_detach = ngd_detach, 907 .pru_disconnect = NULL, 908 .pru_listen = pru_listen_notsupp, 909 .pru_peeraddr = NULL, 910 .pru_rcvd = pru_rcvd_notsupp, 911 .pru_rcvoob = pru_rcvoob_notsupp, 912 .pru_send = ngd_send, 913 .pru_sense = pru_sense_null, 914 .pru_shutdown = NULL, 915 .pru_sockaddr = ng_setsockaddr, 916 .pru_sosend = sosend, 917 .pru_soreceive = soreceive, 918 .pru_sopoll = sopoll 919 }; 920 921 /* 922 * Definitions of protocols supported in the NETGRAPH domain. 923 */ 924 925 extern struct domain ngdomain; /* stop compiler warnings */ 926 927 static struct protosw ngsw[] = { 928 { 929 SOCK_DGRAM, 930 &ngdomain, 931 NG_CONTROL, 932 PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, 933 0, 0, 0, 0, 934 cpu0_soport, 935 0, 0, 0, 0, 936 &ngc_usrreqs 937 }, 938 { 939 SOCK_DGRAM, 940 &ngdomain, 941 NG_DATA, 942 PR_ATOMIC | PR_ADDR, 943 0, 0, 0, 0, 944 cpu0_soport, 945 0, 0, 0, 0, 946 &ngd_usrreqs 947 } 948 }; 949 950 struct domain ngdomain = { 951 AF_NETGRAPH, "netgraph", NULL, NULL, NULL, 952 ngsw, &ngsw[sizeof(ngsw) / sizeof(ngsw[0])], 953 }; 954 955 /* 956 * Handle loading and unloading for this node type 957 * This is to handle auxiliary linkages (e.g protocol domain addition). 958 */ 959 static int 960 ngs_mod_event(module_t mod, int event, void *data) 961 { 962 int error = 0; 963 964 switch (event) { 965 case MOD_LOAD: 966 /* Register protocol domain */ 967 net_add_domain(&ngdomain); 968 break; 969 case MOD_UNLOAD: 970 /* Insure there are no open netgraph sockets */ 971 if (!LIST_EMPTY(&ngsocklist)) { 972 error = EBUSY; 973 break; 974 } 975 976 #ifdef NOTYET 977 /* Unregister protocol domain XXX can't do this yet.. */ 978 if ((error = net_rm_domain(&ngdomain)) != 0) 979 break; 980 #else 981 error = EBUSY; 982 #endif 983 break; 984 default: 985 error = EOPNOTSUPP; 986 break; 987 } 988 return (error); 989 } 990 991 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, ""); 992 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA"); 993 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, ""); 994 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL"); 995 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, ""); 996 997