Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_socket.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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/proc.h> 54 #include <sys/domain.h> 55 #include <sys/errno.h> 56 #include <sys/kernel.h> 57 #include <sys/filedesc.h> 58 #include <sys/malloc.h> 59 #include <sys/queue.h> 60 #include <sys/mbuf.h> 61 #include <sys/protosw.h> 62 #include <sys/socket.h> 63 #include <sys/socketvar.h> 64 #include <sys/sysctl.h> 65 #ifdef NOTYET 66 #include <sys/vnode.h> 67 #endif 68 #include <netgraph/ng_message.h> 69 #include <netgraph/netgraph.h> 70 #include <netgraph/ng_socketvar.h> 71 #include <netgraph/ng_socket.h> 72 73 /* 74 * It's Ascii-art time! 75 * +-------------+ +-------------+ 76 * |socket (ctl)| |socket (data)| 77 * +-------------+ +-------------+ 78 * ^ ^ 79 * | | 80 * v v 81 * +-----------+ +-----------+ 82 * |pcb (ctl)| |pcb (data)| 83 * +-----------+ +-----------+ 84 * ^ ^ 85 * | | 86 * v v 87 * +--------------------------+ 88 * | Socket type private | 89 * | data | 90 * +--------------------------+ 91 * ^ 92 * | 93 * v 94 * +----------------+ 95 * | struct ng_node | 96 * +----------------+ 97 */ 98 99 /* Netgraph node methods */ 100 static ng_constructor_t ngs_constructor; 101 static ng_rcvmsg_t ngs_rcvmsg; 102 static ng_shutdown_t ngs_rmnode; 103 static ng_newhook_t ngs_newhook; 104 static ng_rcvdata_t ngs_rcvdata; 105 static ng_disconnect_t ngs_disconnect; 106 107 /* Internal methods */ 108 static int ng_attach_data(struct socket *so); 109 static int ng_attach_cntl(struct socket *so); 110 static int ng_attach_common(struct socket *so, int type); 111 static void ng_detach_common(struct ngpcb *pcbp, int type); 112 /*static int ng_internalize(struct mbuf *m, struct proc *p); */ 113 114 static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp); 115 static int ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp); 116 static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp); 117 118 static int ngs_mod_event(module_t mod, int event, void *data); 119 static int ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, 120 struct sockaddr_ng *addr); 121 122 /* Netgraph type descriptor */ 123 static struct ng_type typestruct = { 124 NG_VERSION, 125 NG_SOCKET_NODE_TYPE, 126 ngs_mod_event, 127 ngs_constructor, 128 ngs_rcvmsg, 129 ngs_rmnode, 130 ngs_newhook, 131 NULL, 132 NULL, 133 ngs_rcvdata, 134 ngs_rcvdata, 135 ngs_disconnect, 136 NULL 137 }; 138 NETGRAPH_INIT(socket, &typestruct); 139 140 /* Buffer space */ 141 static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */ 142 SYSCTL_INT(_net_graph, OID_AUTO, maxdgram, CTLFLAG_RW, 143 &ngpdg_sendspace , 0, "Maximum outgoing Netgraph datagram size"); 144 static u_long ngpdg_recvspace = 20 * 1024; 145 SYSCTL_INT(_net_graph, OID_AUTO, recvspace, CTLFLAG_RW, 146 &ngpdg_recvspace , 0, "Maximum space for incoming Netgraph datagrams"); 147 148 /* List of all sockets */ 149 LIST_HEAD(, ngpcb) ngsocklist; 150 151 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb) 152 153 /* If getting unexplained errors returned, set this to "Debugger("X"); */ 154 #ifndef TRAP_ERROR 155 #define TRAP_ERROR 156 #endif 157 158 /*************************************************************** 159 Control sockets 160 ***************************************************************/ 161 162 static int 163 ngc_attach(struct socket *so, int proto, struct proc *p) 164 { 165 struct ngpcb *const pcbp = sotongpcb(so); 166 167 if (suser(p)) 168 return (EPERM); 169 if (pcbp != NULL) 170 return (EISCONN); 171 return (ng_attach_cntl(so)); 172 } 173 174 static int 175 ngc_detach(struct socket *so) 176 { 177 struct ngpcb *const pcbp = sotongpcb(so); 178 179 if (pcbp == NULL) 180 return (EINVAL); 181 ng_detach_common(pcbp, NG_CONTROL); 182 return (0); 183 } 184 185 static int 186 ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 187 struct mbuf *control, struct proc *p) 188 { 189 struct ngpcb *const pcbp = sotongpcb(so); 190 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 191 struct ng_mesg *resp; 192 struct mbuf *m0; 193 char *msg, *path = NULL; 194 int len, error = 0; 195 196 if (pcbp == NULL) { 197 error = EINVAL; 198 goto release; 199 } 200 #ifdef NOTYET 201 if (control && (error = ng_internalize(control, p))) { 202 if (pcbp->sockdata == NULL) { 203 error = ENOTCONN; 204 goto release; 205 } 206 } 207 #else /* NOTYET */ 208 if (control) { 209 error = EINVAL; 210 goto release; 211 } 212 #endif /* NOTYET */ 213 214 /* Require destination as there may be >= 1 hooks on this node */ 215 if (addr == NULL) { 216 error = EDESTADDRREQ; 217 goto release; 218 } 219 220 /* Allocate an expendable buffer for the path, chop off 221 * the sockaddr header, and make sure it's NUL terminated */ 222 len = sap->sg_len - 2; 223 MALLOC(path, char *, len + 1, M_NETGRAPH, M_WAITOK); 224 if (path == NULL) { 225 error = ENOMEM; 226 goto release; 227 } 228 bcopy(sap->sg_data, path, len); 229 path[len] = '\0'; 230 231 /* Move the actual message out of mbufs into a linear buffer. 232 * Start by adding up the size of the data. (could use mh_len?) */ 233 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next) 234 len += m0->m_len; 235 236 /* Move the data into a linear buffer as well. Messages are not 237 * delivered in mbufs. */ 238 MALLOC(msg, char *, len + 1, M_NETGRAPH, M_WAITOK); 239 if (msg == NULL) { 240 error = ENOMEM; 241 goto release; 242 } 243 m_copydata(m, 0, len, msg); 244 245 /* The callee will free the msg when done. The addr is our business. */ 246 error = ng_send_msg(pcbp->sockdata->node, 247 (struct ng_mesg *) msg, path, &resp); 248 249 /* If the callee responded with a synchronous response, then put it 250 * back on the receive side of the socket; sap is source address. */ 251 if (error == 0 && resp != NULL) 252 error = ship_msg(pcbp, resp, sap); 253 254 release: 255 if (path != NULL) 256 FREE(path, M_NETGRAPH); 257 if (control != NULL) 258 m_freem(control); 259 if (m != NULL) 260 m_freem(m); 261 return (error); 262 } 263 264 static int 265 ngc_bind(struct socket *so, struct sockaddr *nam, struct proc *p) 266 { 267 struct ngpcb *const pcbp = sotongpcb(so); 268 269 if (pcbp == 0) 270 return (EINVAL); 271 return (ng_bind(nam, pcbp)); 272 } 273 274 static int 275 ngc_connect(struct socket *so, struct sockaddr *nam, struct proc *p) 276 { 277 struct ngpcb *const pcbp = sotongpcb(so); 278 279 if (pcbp == 0) 280 return (EINVAL); 281 return (ng_connect_cntl(nam, pcbp)); 282 } 283 284 /*************************************************************** 285 Data sockets 286 ***************************************************************/ 287 288 static int 289 ngd_attach(struct socket *so, int proto, struct proc *p) 290 { 291 struct ngpcb *const pcbp = sotongpcb(so); 292 293 if (pcbp != NULL) 294 return (EISCONN); 295 return (ng_attach_data(so)); 296 } 297 298 static int 299 ngd_detach(struct socket *so) 300 { 301 struct ngpcb *const pcbp = sotongpcb(so); 302 303 if (pcbp == NULL) 304 return (EINVAL); 305 ng_detach_common(pcbp, NG_DATA); 306 return (0); 307 } 308 309 static int 310 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, 311 struct mbuf *control, struct proc *p) 312 { 313 struct ngpcb *const pcbp = sotongpcb(so); 314 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 315 meta_p mp = NULL; 316 int len, error; 317 hook_p hook = NULL; 318 char hookname[NG_HOOKLEN + 1]; 319 320 if ((pcbp == NULL) || (control != NULL)) { 321 error = EINVAL; 322 goto release; 323 } 324 if (pcbp->sockdata == NULL) { 325 error = ENOTCONN; 326 goto release; 327 } 328 /* 329 * If the user used any of these ways to not specify an address 330 * then handle specially. 331 */ 332 if ((sap == NULL) 333 || ((len = sap->sg_len - 2) <= 0) 334 || (*sap->sg_data == '\0')) { 335 if (pcbp->sockdata->node->numhooks != 1) { 336 error = EDESTADDRREQ; 337 goto release; 338 } 339 /* 340 * if exactly one hook exists, just use it. 341 * Special case to allow write(2) to work on an ng_socket. 342 */ 343 hook = LIST_FIRST(&pcbp->sockdata->node->hooks); 344 } else { 345 if (len > NG_HOOKLEN) { 346 error = EINVAL; 347 goto release; 348 } 349 350 /* 351 * chop off the sockaddr header, and make sure it's NUL 352 * terminated 353 */ 354 bcopy(sap->sg_data, hookname, len); 355 hookname[len] = '\0'; 356 357 /* Find the correct hook from 'hookname' */ 358 LIST_FOREACH(hook, &pcbp->sockdata->node->hooks, hooks) { 359 if (strcmp(hookname, hook->name) == 0) 360 break; 361 } 362 if (hook == NULL) 363 error = EHOSTUNREACH; 364 } 365 366 /* Send data (OK if hook is NULL) */ 367 NG_SEND_DATA(error, hook, m, mp); /* makes m NULL */ 368 369 release: 370 if (control != NULL) 371 m_freem(control); 372 if (m != NULL) 373 m_freem(m); 374 return (error); 375 } 376 377 static int 378 ngd_connect(struct socket *so, struct sockaddr *nam, struct proc *p) 379 { 380 struct ngpcb *const pcbp = sotongpcb(so); 381 382 if (pcbp == 0) 383 return (EINVAL); 384 return (ng_connect_data(nam, pcbp)); 385 } 386 387 /* 388 * Used for both data and control sockets 389 */ 390 static int 391 ng_setsockaddr(struct socket *so, struct sockaddr **addr) 392 { 393 struct ngpcb *pcbp; 394 struct sockaddr_ng *sg; 395 int sg_len, namelen, s; 396 397 /* Why isn't sg_data a `char[1]' ? :-( */ 398 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1; 399 400 s = splnet(); 401 pcbp = sotongpcb(so); 402 if ((pcbp == 0) || (pcbp->sockdata == NULL)) { 403 splx(s); 404 return (EINVAL); 405 } 406 407 namelen = 0; /* silence compiler ! */ 408 409 if (pcbp->sockdata->node->name != NULL) 410 sg_len += namelen = strlen(pcbp->sockdata->node->name); 411 412 MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK); 413 bzero(sg, sg_len); 414 415 if (pcbp->sockdata->node->name != NULL) 416 bcopy(pcbp->sockdata->node->name, sg->sg_data, namelen); 417 splx(s); 418 419 sg->sg_len = sg_len; 420 sg->sg_family = AF_NETGRAPH; 421 *addr = (struct sockaddr *)sg; 422 423 return (0); 424 } 425 426 /* 427 * Attach a socket to it's protocol specific partner. 428 * For a control socket, actually create a netgraph node and attach 429 * to it as well. 430 */ 431 432 static int 433 ng_attach_cntl(struct socket *so) 434 { 435 struct ngsock *privdata; 436 struct ngpcb *pcbp; 437 int error; 438 439 /* Setup protocol control block */ 440 if ((error = ng_attach_common(so, NG_CONTROL)) != 0) 441 return (error); 442 pcbp = sotongpcb(so); 443 444 /* Allocate node private info */ 445 MALLOC(privdata, struct ngsock *, 446 sizeof(*privdata), M_NETGRAPH, M_WAITOK); 447 if (privdata == NULL) { 448 ng_detach_common(pcbp, NG_CONTROL); 449 return (ENOMEM); 450 } 451 bzero(privdata, sizeof(*privdata)); 452 453 /* Make the generic node components */ 454 if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) { 455 FREE(privdata, M_NETGRAPH); 456 ng_detach_common(pcbp, NG_CONTROL); 457 return (error); 458 } 459 privdata->node->private = privdata; 460 461 /* Link the pcb and the node private data */ 462 privdata->ctlsock = pcbp; 463 pcbp->sockdata = privdata; 464 privdata->refs++; 465 return (0); 466 } 467 468 static int 469 ng_attach_data(struct socket *so) 470 { 471 return(ng_attach_common(so, NG_DATA)); 472 } 473 474 /* 475 * Set up a socket protocol control block. 476 * This code is shared between control and data sockets. 477 */ 478 static int 479 ng_attach_common(struct socket *so, int type) 480 { 481 struct ngpcb *pcbp; 482 int error; 483 484 /* Standard socket setup stuff */ 485 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace); 486 if (error) 487 return (error); 488 489 /* Allocate the pcb */ 490 MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK); 491 if (pcbp == NULL) 492 return (ENOMEM); 493 bzero(pcbp, sizeof(*pcbp)); 494 pcbp->type = type; 495 496 /* Link the pcb and the socket */ 497 so->so_pcb = (caddr_t) pcbp; 498 pcbp->ng_socket = so; 499 500 /* Add the socket to linked list */ 501 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks); 502 return (0); 503 } 504 505 /* 506 * Disassociate the socket from it's protocol specific 507 * partner. If it's attached to a node's private data structure, 508 * then unlink from that too. If we were the last socket attached to it, 509 * then shut down the entire node. Shared code for control and data sockets. 510 */ 511 static void 512 ng_detach_common(struct ngpcb *pcbp, int which) 513 { 514 struct ngsock *sockdata; 515 516 if (pcbp->sockdata) { 517 sockdata = pcbp->sockdata; 518 pcbp->sockdata = NULL; 519 switch (which) { 520 case NG_CONTROL: 521 sockdata->ctlsock = NULL; 522 break; 523 case NG_DATA: 524 sockdata->datasock = NULL; 525 break; 526 default: 527 panic(__FUNCTION__); 528 } 529 if ((--sockdata->refs == 0) && (sockdata->node != NULL)) 530 ng_rmnode(sockdata->node); 531 } 532 pcbp->ng_socket->so_pcb = NULL; 533 pcbp->ng_socket = NULL; 534 LIST_REMOVE(pcbp, socks); 535 FREE(pcbp, M_PCB); 536 } 537 538 #ifdef NOTYET 539 /* 540 * File descriptors can be passed into a AF_NETGRAPH socket. 541 * Note, that file descriptors cannot be passed OUT. 542 * Only character device descriptors are accepted. 543 * Character devices are useful to connect a graph to a device, 544 * which after all is the purpose of this whole system. 545 */ 546 static int 547 ng_internalize(struct mbuf *control, struct proc *p) 548 { 549 struct filedesc *fdp = p->p_fd; 550 const struct cmsghdr *cm = mtod(control, const struct cmsghdr *); 551 struct file *fp; 552 struct vnode *vn; 553 int oldfds; 554 int fd; 555 556 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || 557 cm->cmsg_len != control->m_len) { 558 TRAP_ERROR; 559 return (EINVAL); 560 } 561 562 /* Check there is only one FD. XXX what would more than one signify? */ 563 oldfds = (cm->cmsg_len - sizeof(*cm)) / sizeof(int); 564 if (oldfds != 1) { 565 TRAP_ERROR; 566 return (EINVAL); 567 } 568 569 /* Check that the FD given is legit. and change it to a pointer to a 570 * struct file. */ 571 fd = *(int *) (cm + 1); 572 if ((unsigned) fd >= fdp->fd_nfiles 573 || (fp = fdp->fd_ofiles[fd]) == NULL) { 574 return (EBADF); 575 } 576 577 /* Depending on what kind of resource it is, act differently. For 578 * devices, we treat it as a file. For a AF_NETGRAPH socket, 579 * shortcut straight to the node. */ 580 switch (fp->f_type) { 581 case DTYPE_VNODE: 582 vn = (struct vnode *) fp->f_data; 583 if (vn && (vn->v_type == VCHR)) { 584 /* for a VCHR, actually reference the FILE */ 585 fp->f_count++; 586 /* XXX then what :) */ 587 /* how to pass on to other modules? */ 588 } else { 589 TRAP_ERROR; 590 return (EINVAL); 591 } 592 break; 593 default: 594 TRAP_ERROR; 595 return (EINVAL); 596 } 597 return (0); 598 } 599 #endif /* NOTYET */ 600 601 /* 602 * Connect the data socket to a named control socket node. 603 */ 604 static int 605 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp) 606 { 607 struct sockaddr_ng *sap; 608 node_p farnode; 609 struct ngsock *sockdata; 610 int error; 611 612 /* If we are already connected, don't do it again */ 613 if (pcbp->sockdata != NULL) 614 return (EISCONN); 615 616 /* Find the target (victim) and check it doesn't already have a data 617 * socket. Also check it is a 'socket' type node. */ 618 sap = (struct sockaddr_ng *) nam; 619 if ((error = ng_path2node(NULL, sap->sg_data, &farnode, NULL))) 620 return (error); 621 622 if (strcmp(farnode->type->name, NG_SOCKET_NODE_TYPE) != 0) 623 return (EINVAL); 624 sockdata = farnode->private; 625 if (sockdata->datasock != NULL) 626 return (EADDRINUSE); 627 628 /* Link the PCB and the private data struct. and note the extra 629 * reference */ 630 sockdata->datasock = pcbp; 631 pcbp->sockdata = sockdata; 632 sockdata->refs++; 633 return (0); 634 } 635 636 /* 637 * Connect the existing control socket node to a named node:hook. 638 * The hook we use on this end is the same name as the remote node name. 639 */ 640 static int 641 ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp) 642 { 643 struct ngsock *const sockdata = pcbp->sockdata; 644 struct sockaddr_ng *sap; 645 char *node, *hook; 646 node_p farnode; 647 int rtn, error; 648 649 sap = (struct sockaddr_ng *) nam; 650 rtn = ng_path_parse(sap->sg_data, &node, NULL, &hook); 651 if (rtn < 0 || node == NULL || hook == NULL) { 652 TRAP_ERROR; 653 return (EINVAL); 654 } 655 farnode = ng_findname(sockdata->node, node); 656 if (farnode == NULL) { 657 TRAP_ERROR; 658 return (EADDRNOTAVAIL); 659 } 660 661 /* Connect, using a hook name the same as the far node name. */ 662 error = ng_con_nodes(sockdata->node, node, farnode, hook); 663 return error; 664 } 665 666 /* 667 * Binding a socket means giving the corresponding node a name 668 */ 669 static int 670 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp) 671 { 672 struct ngsock *const sockdata = pcbp->sockdata; 673 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam; 674 675 if (sockdata == NULL) { 676 TRAP_ERROR; 677 return (EINVAL); 678 } 679 if (sap->sg_len < 3 || sap->sg_data[sap->sg_len - 3] != '\0') { 680 TRAP_ERROR; 681 return (EINVAL); 682 } 683 return (ng_name_node(sockdata->node, sap->sg_data)); 684 } 685 686 /* 687 * Take a message and pass it up to the control socket associated 688 * with the node. 689 */ 690 static int 691 ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr) 692 { 693 struct socket *const so = pcbp->ng_socket; 694 struct mbuf *mdata; 695 int msglen; 696 697 /* Copy the message itself into an mbuf chain */ 698 msglen = sizeof(struct ng_mesg) + msg->header.arglen; 699 mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL); 700 701 /* Here we free the message, as we are the end of the line. 702 * We need to do that regardless of whether we got mbufs. */ 703 FREE(msg, M_NETGRAPH); 704 705 if (mdata == NULL) { 706 TRAP_ERROR; 707 return (ENOBUFS); 708 } 709 710 /* Send it up to the socket */ 711 if (sbappendaddr(&so->so_rcv, 712 (struct sockaddr *) addr, mdata, NULL) == 0) { 713 TRAP_ERROR; 714 m_freem(mdata); 715 return (ENOBUFS); 716 } 717 sorwakeup(so); 718 return (0); 719 } 720 721 /* 722 * You can only create new nodes from the socket end of things. 723 */ 724 static int 725 ngs_constructor(node_p *nodep) 726 { 727 return (EINVAL); 728 } 729 730 /* 731 * We allow any hook to be connected to the node. 732 * There is no per-hook private information though. 733 */ 734 static int 735 ngs_newhook(node_p node, hook_p hook, const char *name) 736 { 737 hook->private = node->private; 738 return (0); 739 } 740 741 /* 742 * Incoming messages get passed up to the control socket. 743 * Unless they are for us specifically (socket_type) 744 */ 745 static int 746 ngs_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, 747 struct ng_mesg **resp) 748 { 749 struct ngsock *const sockdata = node->private; 750 struct ngpcb *const pcbp = sockdata->ctlsock; 751 struct sockaddr_ng *addr; 752 int addrlen; 753 int error = 0; 754 755 /* Only allow mesgs to be passed if we have the control socket. 756 * Data sockets can only support the generic messages. */ 757 if (pcbp == NULL) { 758 TRAP_ERROR; 759 return (EINVAL); 760 } 761 762 if (msg->header.typecookie == NGM_SOCKET_COOKIE) { 763 switch (msg->header.cmd) { 764 case NGM_SOCK_CMD_NOLINGER: 765 sockdata->flags |= NGS_FLAG_NOLINGER; 766 break; 767 case NGM_SOCK_CMD_LINGER: 768 sockdata->flags &= ~NGS_FLAG_NOLINGER; 769 break; 770 default: 771 error = EINVAL; /* unknown command */ 772 } 773 /* Free the message and return */ 774 FREE(msg, M_NETGRAPH); 775 return(error); 776 777 } 778 /* Get the return address into a sockaddr */ 779 if ((retaddr == NULL) || (*retaddr == '\0')) 780 retaddr = ""; 781 addrlen = strlen(retaddr); 782 MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH, M_NOWAIT); 783 if (addr == NULL) { 784 TRAP_ERROR; 785 return (ENOMEM); 786 } 787 addr->sg_len = addrlen + 3; 788 addr->sg_family = AF_NETGRAPH; 789 bcopy(retaddr, addr->sg_data, addrlen); 790 addr->sg_data[addrlen] = '\0'; 791 792 /* Send it up */ 793 error = ship_msg(pcbp, msg, addr); 794 FREE(addr, M_NETGRAPH); 795 return (error); 796 } 797 798 /* 799 * Receive data on a hook 800 */ 801 static int 802 ngs_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 803 { 804 struct ngsock *const sockdata = hook->node->private; 805 struct ngpcb *const pcbp = sockdata->datasock; 806 struct socket *so; 807 struct sockaddr_ng *addr; 808 char *addrbuf[NG_HOOKLEN + 1 + 4]; 809 int addrlen; 810 811 /* If there is no data socket, black-hole it */ 812 if (pcbp == NULL) { 813 NG_FREE_DATA(m, meta); 814 return (0); 815 } 816 so = pcbp->ng_socket; 817 818 /* Get the return address into a sockaddr. */ 819 addrlen = strlen(hook->name); /* <= NG_HOOKLEN */ 820 addr = (struct sockaddr_ng *) addrbuf; 821 addr->sg_len = addrlen + 3; 822 addr->sg_family = AF_NETGRAPH; 823 bcopy(hook->name, addr->sg_data, addrlen); 824 addr->sg_data[addrlen] = '\0'; 825 826 /* We have no use for the meta data, free/clear it now. */ 827 NG_FREE_META(meta); 828 829 /* Try to tell the socket which hook it came in on */ 830 if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) { 831 m_freem(m); 832 TRAP_ERROR; 833 return (ENOBUFS); 834 } 835 sorwakeup(so); 836 return (0); 837 } 838 839 /* 840 * Hook disconnection 841 * 842 * For this type, removal of the last link destroys the node 843 * if the NOLINGER flag is set. 844 */ 845 static int 846 ngs_disconnect(hook_p hook) 847 { 848 struct ngsock *const sockdata = hook->node->private; 849 850 if ((sockdata->flags & NGS_FLAG_NOLINGER ) 851 && (hook->node->numhooks == 0)) { 852 ng_rmnode(hook->node); 853 } 854 return (0); 855 } 856 857 /* 858 * Do local shutdown processing. 859 * In this case, that involves making sure the socket 860 * knows we should be shutting down. 861 */ 862 static int 863 ngs_rmnode(node_p node) 864 { 865 struct ngsock *const sockdata = node->private; 866 struct ngpcb *const dpcbp = sockdata->datasock; 867 struct ngpcb *const pcbp = sockdata->ctlsock; 868 869 ng_cutlinks(node); 870 ng_unname(node); 871 872 if (dpcbp != NULL) { 873 soisdisconnected(dpcbp->ng_socket); 874 dpcbp->sockdata = NULL; 875 sockdata->datasock = NULL; 876 sockdata->refs--; 877 } 878 if (pcbp != NULL) { 879 soisdisconnected(pcbp->ng_socket); 880 pcbp->sockdata = NULL; 881 sockdata->ctlsock = NULL; 882 sockdata->refs--; 883 } 884 node->private = NULL; 885 ng_unref(node); 886 FREE(sockdata, M_NETGRAPH); 887 return (0); 888 } 889 890 /* 891 * Control and data socket type descriptors 892 */ 893 894 static struct pr_usrreqs ngc_usrreqs = { 895 NULL, /* abort */ 896 pru_accept_notsupp, 897 ngc_attach, 898 ngc_bind, 899 ngc_connect, 900 pru_connect2_notsupp, 901 pru_control_notsupp, 902 ngc_detach, 903 NULL, /* disconnect */ 904 pru_listen_notsupp, 905 NULL, /* setpeeraddr */ 906 pru_rcvd_notsupp, 907 pru_rcvoob_notsupp, 908 ngc_send, 909 pru_sense_null, 910 NULL, /* shutdown */ 911 ng_setsockaddr, 912 sosend, 913 soreceive, 914 sopoll 915 }; 916 917 static struct pr_usrreqs ngd_usrreqs = { 918 NULL, /* abort */ 919 pru_accept_notsupp, 920 ngd_attach, 921 NULL, /* bind */ 922 ngd_connect, 923 pru_connect2_notsupp, 924 pru_control_notsupp, 925 ngd_detach, 926 NULL, /* disconnect */ 927 pru_listen_notsupp, 928 NULL, /* setpeeraddr */ 929 pru_rcvd_notsupp, 930 pru_rcvoob_notsupp, 931 ngd_send, 932 pru_sense_null, 933 NULL, /* shutdown */ 934 ng_setsockaddr, 935 sosend, 936 soreceive, 937 sopoll 938 }; 939 940 /* 941 * Definitions of protocols supported in the NETGRAPH domain. 942 */ 943 944 extern struct domain ngdomain; /* stop compiler warnings */ 945 946 static struct protosw ngsw[] = { 947 { 948 SOCK_DGRAM, 949 &ngdomain, 950 NG_CONTROL, 951 PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, 952 0, 0, 0, 0, 953 NULL, 954 0, 0, 0, 0, 955 &ngc_usrreqs 956 }, 957 { 958 SOCK_DGRAM, 959 &ngdomain, 960 NG_DATA, 961 PR_ATOMIC | PR_ADDR, 962 0, 0, 0, 0, 963 NULL, 964 0, 0, 0, 0, 965 &ngd_usrreqs 966 } 967 }; 968 969 struct domain ngdomain = { 970 AF_NETGRAPH, 971 "netgraph", 972 0, 973 NULL, 974 NULL, 975 ngsw, 976 &ngsw[sizeof(ngsw) / sizeof(ngsw[0])], 977 0, 978 NULL, 979 0, 980 0 981 }; 982 983 /* 984 * Handle loading and unloading for this node type 985 * This is to handle auxiliary linkages (e.g protocol domain addition). 986 */ 987 static int 988 ngs_mod_event(module_t mod, int event, void *data) 989 { 990 int error = 0; 991 992 switch (event) { 993 case MOD_LOAD: 994 /* Register protocol domain */ 995 net_add_domain(&ngdomain); 996 break; 997 case MOD_UNLOAD: 998 /* Insure there are no open netgraph sockets */ 999 if (!LIST_EMPTY(&ngsocklist)) { 1000 error = EBUSY; 1001 break; 1002 } 1003 1004 #ifdef NOTYET 1005 /* Unregister protocol domain XXX can't do this yet.. */ 1006 if ((error = net_rm_domain(&ngdomain)) != 0) 1007 break; 1008 #else 1009 error = EBUSY; 1010 #endif 1011 break; 1012 default: 1013 error = EOPNOTSUPP; 1014 break; 1015 } 1016 return (error); 1017 } 1018 1019 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, ""); 1020 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA"); 1021 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, ""); 1022 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL"); 1023 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, ""); 1024
Cache object: 719ea7ce4e23a16b21e2bb5f0aa8af38
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]