ng_socket.c revision 70159
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: head/sys/netgraph/ng_socket.c 70159 2000-12-18 20:03:32Z julian $ 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 */ 99static ng_constructor_t ngs_constructor; 100static ng_rcvmsg_t ngs_rcvmsg; 101static ng_shutdown_t ngs_rmnode; 102static ng_newhook_t ngs_newhook; 103static ng_rcvdata_t ngs_rcvdata; 104static ng_disconnect_t ngs_disconnect; 105 106/* Internal methods */ 107static int ng_attach_data(struct socket *so); 108static int ng_attach_cntl(struct socket *so); 109static int ng_attach_common(struct socket *so, int type); 110static void ng_detach_common(struct ngpcb *pcbp, int type); 111/*static int ng_internalize(struct mbuf *m, struct proc *p); */ 112 113static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp); 114static int ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp); 115static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp); 116 117static int ngs_mod_event(module_t mod, int event, void *data); 118static int ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, 119 struct sockaddr_ng *addr); 120 121/* Netgraph type descriptor */ 122static struct ng_type typestruct = { 123 NG_ABI_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_disconnect, 134 NULL 135}; 136NETGRAPH_INIT(socket, &typestruct); 137 138/* Buffer space */ 139static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */ 140static u_long ngpdg_recvspace = 20 * 1024; 141 142/* List of all sockets */ 143LIST_HEAD(, ngpcb) ngsocklist; 144 145#define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb) 146 147/* If getting unexplained errors returned, set this to "Debugger("X"); */ 148#ifndef TRAP_ERROR 149#define TRAP_ERROR 150#endif 151 152/*************************************************************** 153 Control sockets 154***************************************************************/ 155 156static int 157ngc_attach(struct socket *so, int proto, struct proc *p) 158{ 159 struct ngpcb *const pcbp = sotongpcb(so); 160 161 if (suser(p)) 162 return (EPERM); 163 if (pcbp != NULL) 164 return (EISCONN); 165 return (ng_attach_cntl(so)); 166} 167 168static int 169ngc_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 179static int 180ngc_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, NULL, NULL, &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 248release: 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 258static int 259ngc_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 268static int 269ngc_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 282static int 283ngd_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 292static int 293ngd_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 303static int 304ngd_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 int len, error; 310 hook_p hook = NULL; 311 char hookname[NG_HOOKLEN + 1]; 312 313 if ((pcbp == NULL) || (control != NULL)) { 314 error = EINVAL; 315 goto release; 316 } 317 if (pcbp->sockdata == NULL) { 318 error = ENOTCONN; 319 goto release; 320 } 321 /* 322 * If the user used any of these ways to not specify an address 323 * then handle specially. 324 */ 325 if ((sap == NULL) 326 || ((len = sap->sg_len) <= 2) 327 || (*sap->sg_data == '\0')) { 328 if (pcbp->sockdata->node->numhooks != 1) { 329 error = EDESTADDRREQ; 330 goto release; 331 } 332 /* 333 * if exactly one hook exists, just use it. 334 * Special case to allow write(2) to work on an ng_socket. 335 */ 336 hook = LIST_FIRST(&pcbp->sockdata->node->hooks); 337 } else { 338 if (len > NG_HOOKLEN) { 339 error = EINVAL; 340 goto release; 341 } 342 343 /* 344 * chop off the sockaddr header, and make sure it's NUL 345 * terminated 346 */ 347 bcopy(sap->sg_data, hookname, len); 348 hookname[len] = '\0'; 349 350 /* Find the correct hook from 'hookname' */ 351 LIST_FOREACH(hook, &pcbp->sockdata->node->hooks, hooks) { 352 if (strcmp(hookname, hook->name) == 0) 353 break; 354 } 355 if (hook == NULL) 356 error = EHOSTUNREACH; 357 } 358 359 /* Send data (OK if hook is NULL) */ 360 NG_SEND_DATA_ONLY(error, hook, m); /* makes m NULL */ 361 362release: 363 if (control != NULL) 364 m_freem(control); 365 if (m != NULL) 366 m_freem(m); 367 return (error); 368} 369 370static int 371ngd_connect(struct socket *so, struct sockaddr *nam, struct proc *p) 372{ 373 struct ngpcb *const pcbp = sotongpcb(so); 374 375 if (pcbp == 0) 376 return (EINVAL); 377 return (ng_connect_data(nam, pcbp)); 378} 379 380/* 381 * Used for both data and control sockets 382 */ 383static int 384ng_setsockaddr(struct socket *so, struct sockaddr **addr) 385{ 386 struct ngpcb *pcbp; 387 struct sockaddr_ng *sg; 388 int sg_len, namelen, s; 389 390 /* Why isn't sg_data a `char[1]' ? :-( */ 391 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1; 392 393 s = splnet(); 394 pcbp = sotongpcb(so); 395 if ((pcbp == NULL) || (pcbp->sockdata == NULL)) { 396 splx(s); 397 return (EINVAL); 398 } 399 400 namelen = 0; /* silence compiler ! */ 401 402 if (pcbp->sockdata->node->name != NULL) 403 sg_len += namelen = strlen(pcbp->sockdata->node->name); 404 405 MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK | M_ZERO); 406 407 if (pcbp->sockdata->node->name != NULL) 408 bcopy(pcbp->sockdata->node->name, sg->sg_data, namelen); 409 splx(s); 410 411 sg->sg_len = sg_len; 412 sg->sg_family = AF_NETGRAPH; 413 *addr = (struct sockaddr *)sg; 414 415 return (0); 416} 417 418/* 419 * Attach a socket to it's protocol specific partner. 420 * For a control socket, actually create a netgraph node and attach 421 * to it as well. 422 */ 423 424static int 425ng_attach_cntl(struct socket *so) 426{ 427 struct ngsock *privdata; 428 struct ngpcb *pcbp; 429 int error; 430 431 /* Setup protocol control block */ 432 if ((error = ng_attach_common(so, NG_CONTROL)) != 0) 433 return (error); 434 pcbp = sotongpcb(so); 435 436 /* Allocate node private info */ 437 MALLOC(privdata, struct ngsock *, 438 sizeof(*privdata), M_NETGRAPH, M_WAITOK | M_ZERO); 439 if (privdata == NULL) { 440 ng_detach_common(pcbp, NG_CONTROL); 441 return (ENOMEM); 442 } 443 444 /* Make the generic node components */ 445 if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) { 446 FREE(privdata, M_NETGRAPH); 447 ng_detach_common(pcbp, NG_CONTROL); 448 return (error); 449 } 450 privdata->node->private = privdata; 451 452 /* Link the pcb and the node private data */ 453 privdata->ctlsock = pcbp; 454 pcbp->sockdata = privdata; 455 privdata->refs++; 456 return (0); 457} 458 459static int 460ng_attach_data(struct socket *so) 461{ 462 return(ng_attach_common(so, NG_DATA)); 463} 464 465/* 466 * Set up a socket protocol control block. 467 * This code is shared between control and data sockets. 468 */ 469static int 470ng_attach_common(struct socket *so, int type) 471{ 472 struct ngpcb *pcbp; 473 int error; 474 475 /* Standard socket setup stuff */ 476 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace); 477 if (error) 478 return (error); 479 480 /* Allocate the pcb */ 481 MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO); 482 if (pcbp == NULL) 483 return (ENOMEM); 484 pcbp->type = type; 485 486 /* Link the pcb and the socket */ 487 so->so_pcb = (caddr_t) pcbp; 488 pcbp->ng_socket = so; 489 490 /* Add the socket to linked list */ 491 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks); 492 return (0); 493} 494 495/* 496 * Disassociate the socket from it's protocol specific 497 * partner. If it's attached to a node's private data structure, 498 * then unlink from that too. If we were the last socket attached to it, 499 * then shut down the entire node. Shared code for control and data sockets. 500 */ 501static void 502ng_detach_common(struct ngpcb *pcbp, int which) 503{ 504 struct ngsock *sockdata; 505 506 if (pcbp->sockdata) { 507 sockdata = pcbp->sockdata; 508 pcbp->sockdata = NULL; 509 switch (which) { 510 case NG_CONTROL: 511 sockdata->ctlsock = NULL; 512 break; 513 case NG_DATA: 514 sockdata->datasock = NULL; 515 break; 516 default: 517 panic(__FUNCTION__); 518 } 519 if ((--sockdata->refs == 0) && (sockdata->node != NULL)) 520 ng_rmnode(sockdata->node); 521 } 522 pcbp->ng_socket->so_pcb = NULL; 523 pcbp->ng_socket = NULL; 524 LIST_REMOVE(pcbp, socks); 525 FREE(pcbp, M_PCB); 526} 527 528#ifdef NOTYET 529/* 530 * File descriptors can be passed into a AF_NETGRAPH socket. 531 * Note, that file descriptors cannot be passed OUT. 532 * Only character device descriptors are accepted. 533 * Character devices are useful to connect a graph to a device, 534 * which after all is the purpose of this whole system. 535 */ 536static int 537ng_internalize(struct mbuf *control, struct proc *p) 538{ 539 struct filedesc *fdp = p->p_fd; 540 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 541 struct file *fp; 542 struct vnode *vn; 543 int oldfds; 544 int fd; 545 546 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || 547 cm->cmsg_len != control->m_len) { 548 TRAP_ERROR; 549 return (EINVAL); 550 } 551 552 /* Check there is only one FD. XXX what would more than one signify? */ 553 oldfds = (cm->cmsg_len - sizeof(*cm)) / sizeof(int); 554 if (oldfds != 1) { 555 TRAP_ERROR; 556 return (EINVAL); 557 } 558 559 /* Check that the FD given is legit. and change it to a pointer to a 560 * struct file. */ 561 fd = *(int *) (cm + 1); 562 if ((unsigned) fd >= fdp->fd_nfiles 563 || (fp = fdp->fd_ofiles[fd]) == NULL) { 564 return (EBADF); 565 } 566 567 /* Depending on what kind of resource it is, act differently. For 568 * devices, we treat it as a file. For a AF_NETGRAPH socket, 569 * shortcut straight to the node. */ 570 switch (fp->f_type) { 571 case DTYPE_VNODE: 572 vn = (struct vnode *) fp->f_data; 573 if (vn && (vn->v_type == VCHR)) { 574 /* for a VCHR, actually reference the FILE */ 575 fp->f_count++; 576 /* XXX then what :) */ 577 /* how to pass on to other modules? */ 578 } else { 579 TRAP_ERROR; 580 return (EINVAL); 581 } 582 break; 583 default: 584 TRAP_ERROR; 585 return (EINVAL); 586 } 587 return (0); 588} 589#endif /* NOTYET */ 590 591/* 592 * Connect the data socket to a named control socket node. 593 */ 594static int 595ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp) 596{ 597 struct sockaddr_ng *sap; 598 node_p farnode; 599 struct ngsock *sockdata; 600 int error; 601 602 /* If we are already connected, don't do it again */ 603 if (pcbp->sockdata != NULL) 604 return (EISCONN); 605 606 /* Find the target (victim) and check it doesn't already have a data 607 * socket. Also check it is a 'socket' type node. */ 608 sap = (struct sockaddr_ng *) nam; 609 if ((error = ng_path2node(NULL, sap->sg_data, &farnode, NULL))) 610 return (error); 611 612 if (strcmp(farnode->type->name, NG_SOCKET_NODE_TYPE) != 0) 613 return (EINVAL); 614 sockdata = farnode->private; 615 if (sockdata->datasock != NULL) 616 return (EADDRINUSE); 617 618 /* Link the PCB and the private data struct. and note the extra 619 * reference */ 620 sockdata->datasock = pcbp; 621 pcbp->sockdata = sockdata; 622 sockdata->refs++; 623 return (0); 624} 625 626/* 627 * Connect the existing control socket node to a named node:hook. 628 * The hook we use on this end is the same name as the remote node name. 629 */ 630static int 631ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp) 632{ 633 struct ngsock *const sockdata = pcbp->sockdata; 634 struct sockaddr_ng *sap; 635 char *node, *hook; 636 node_p farnode; 637 int rtn, error; 638 639 sap = (struct sockaddr_ng *) nam; 640 rtn = ng_path_parse(sap->sg_data, &node, NULL, &hook); 641 if (rtn < 0 || node == NULL || hook == NULL) { 642 TRAP_ERROR; 643 return (EINVAL); 644 } 645 farnode = ng_findname(sockdata->node, node); 646 if (farnode == NULL) { 647 TRAP_ERROR; 648 return (EADDRNOTAVAIL); 649 } 650 651 /* Connect, using a hook name the same as the far node name. */ 652 error = ng_con_nodes(sockdata->node, node, farnode, hook); 653 return error; 654} 655 656/* 657 * Binding a socket means giving the corresponding node a name 658 */ 659static int 660ng_bind(struct sockaddr *nam, struct ngpcb *pcbp) 661{ 662 struct ngsock *const sockdata = pcbp->sockdata; 663 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam; 664 665 if (sockdata == NULL) { 666 TRAP_ERROR; 667 return (EINVAL); 668 } 669 if ((sap->sg_len < 4) 670 || (sap->sg_len > (NG_NODELEN + 3)) 671 || (sap->sg_data[0] == '\0') 672 || (sap->sg_data[sap->sg_len - 3] != '\0')) { 673 TRAP_ERROR; 674 return (EINVAL); 675 } 676 return (ng_name_node(sockdata->node, sap->sg_data)); 677} 678 679/* 680 * Take a message and pass it up to the control socket associated 681 * with the node. 682 */ 683static int 684ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr) 685{ 686 struct socket *const so = pcbp->ng_socket; 687 struct mbuf *mdata; 688 int msglen; 689 690 /* Copy the message itself into an mbuf chain */ 691 msglen = sizeof(struct ng_mesg) + msg->header.arglen; 692 mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL); 693 694 /* Here we free the message, as we are the end of the line. 695 * We need to do that regardless of whether we got mbufs. */ 696 FREE(msg, M_NETGRAPH); 697 698 if (mdata == NULL) { 699 TRAP_ERROR; 700 return (ENOBUFS); 701 } 702 703 /* Send it up to the socket */ 704 if (sbappendaddr(&so->so_rcv, 705 (struct sockaddr *) addr, mdata, NULL) == 0) { 706 TRAP_ERROR; 707 m_freem(mdata); 708 return (ENOBUFS); 709 } 710 sorwakeup(so); 711 return (0); 712} 713 714/* 715 * You can only create new nodes from the socket end of things. 716 */ 717static int 718ngs_constructor(node_p *nodep) 719{ 720 return (EINVAL); 721} 722 723/* 724 * We allow any hook to be connected to the node. 725 * There is no per-hook private information though. 726 */ 727static int 728ngs_newhook(node_p node, hook_p hook, const char *name) 729{ 730 hook->private = node->private; 731 return (0); 732} 733 734/* 735 * Incoming messages get passed up to the control socket. 736 * Unless they are for us specifically (socket_type) 737 */ 738static int 739ngs_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, 740 struct ng_mesg **resp, hook_p lasthook) 741{ 742 struct ngsock *const sockdata = node->private; 743 struct ngpcb *const pcbp = sockdata->ctlsock; 744 struct sockaddr_ng *addr; 745 int addrlen; 746 int error = 0; 747 748 /* Only allow mesgs to be passed if we have the control socket. 749 * Data sockets can only support the generic messages. */ 750 if (pcbp == NULL) { 751 TRAP_ERROR; 752 return (EINVAL); 753 } 754 755 if (msg->header.typecookie == NGM_SOCKET_COOKIE) { 756 switch (msg->header.cmd) { 757 case NGM_SOCK_CMD_NOLINGER: 758 sockdata->flags |= NGS_FLAG_NOLINGER; 759 break; 760 case NGM_SOCK_CMD_LINGER: 761 sockdata->flags &= ~NGS_FLAG_NOLINGER; 762 break; 763 default: 764 error = EINVAL; /* unknown command */ 765 } 766 /* Free the message and return */ 767 FREE(msg, M_NETGRAPH); 768 return(error); 769 770 } 771 /* Get the return address into a sockaddr */ 772 if ((retaddr == NULL) || (*retaddr == '\0')) 773 retaddr = ""; 774 addrlen = strlen(retaddr); 775 MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH, M_NOWAIT); 776 if (addr == NULL) { 777 TRAP_ERROR; 778 return (ENOMEM); 779 } 780 addr->sg_len = addrlen + 3; 781 addr->sg_family = AF_NETGRAPH; 782 bcopy(retaddr, addr->sg_data, addrlen); 783 addr->sg_data[addrlen] = '\0'; 784 785 /* Send it up */ 786 error = ship_msg(pcbp, msg, addr); 787 FREE(addr, M_NETGRAPH); 788 return (error); 789} 790 791/* 792 * Receive data on a hook 793 */ 794static int 795ngs_rcvdata(hook_p hook, struct mbuf *m, meta_p meta, 796 struct mbuf **ret_m, meta_p *ret_meta, struct ng_mesg **resp) 797{ 798 struct ngsock *const sockdata = hook->node->private; 799 struct ngpcb *const pcbp = sockdata->datasock; 800 struct socket *so; 801 struct sockaddr_ng *addr; 802 char *addrbuf[NG_HOOKLEN + 1 + 4]; 803 int addrlen; 804 805 /* If there is no data socket, black-hole it */ 806 if (pcbp == NULL) { 807 NG_FREE_DATA(m, meta); 808 return (0); 809 } 810 so = pcbp->ng_socket; 811 812 /* Get the return address into a sockaddr. */ 813 addrlen = strlen(hook->name); /* <= NG_HOOKLEN */ 814 addr = (struct sockaddr_ng *) addrbuf; 815 addr->sg_len = addrlen + 3; 816 addr->sg_family = AF_NETGRAPH; 817 bcopy(hook->name, addr->sg_data, addrlen); 818 addr->sg_data[addrlen] = '\0'; 819 820 /* We have no use for the meta data, free/clear it now. */ 821 NG_FREE_META(meta); 822 823 /* Try to tell the socket which hook it came in on */ 824 if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) { 825 m_freem(m); 826 TRAP_ERROR; 827 return (ENOBUFS); 828 } 829 sorwakeup(so); 830 return (0); 831} 832 833/* 834 * Hook disconnection 835 * 836 * For this type, removal of the last link destroys the node 837 * if the NOLINGER flag is set. 838 */ 839static int 840ngs_disconnect(hook_p hook) 841{ 842 struct ngsock *const sockdata = hook->node->private; 843 844 if ((sockdata->flags & NGS_FLAG_NOLINGER ) 845 && (hook->node->numhooks == 0)) { 846 ng_rmnode(hook->node); 847 } 848 return (0); 849} 850 851/* 852 * Do local shutdown processing. 853 * In this case, that involves making sure the socket 854 * knows we should be shutting down. 855 */ 856static int 857ngs_rmnode(node_p node) 858{ 859 struct ngsock *const sockdata = node->private; 860 struct ngpcb *const dpcbp = sockdata->datasock; 861 struct ngpcb *const pcbp = sockdata->ctlsock; 862 863 ng_cutlinks(node); 864 ng_unname(node); 865 866 if (dpcbp != NULL) { 867 soisdisconnected(dpcbp->ng_socket); 868 dpcbp->sockdata = NULL; 869 sockdata->datasock = NULL; 870 sockdata->refs--; 871 } 872 if (pcbp != NULL) { 873 soisdisconnected(pcbp->ng_socket); 874 pcbp->sockdata = NULL; 875 sockdata->ctlsock = NULL; 876 sockdata->refs--; 877 } 878 node->private = NULL; 879 ng_unref(node); 880 FREE(sockdata, M_NETGRAPH); 881 return (0); 882} 883 884/* 885 * Control and data socket type descriptors 886 */ 887 888static struct pr_usrreqs ngc_usrreqs = { 889 NULL, /* abort */ 890 pru_accept_notsupp, 891 ngc_attach, 892 ngc_bind, 893 ngc_connect, 894 pru_connect2_notsupp, 895 pru_control_notsupp, 896 ngc_detach, 897 NULL, /* disconnect */ 898 pru_listen_notsupp, 899 NULL, /* setpeeraddr */ 900 pru_rcvd_notsupp, 901 pru_rcvoob_notsupp, 902 ngc_send, 903 pru_sense_null, 904 NULL, /* shutdown */ 905 ng_setsockaddr, 906 sosend, 907 soreceive, 908 sopoll 909}; 910 911static struct pr_usrreqs ngd_usrreqs = { 912 NULL, /* abort */ 913 pru_accept_notsupp, 914 ngd_attach, 915 NULL, /* bind */ 916 ngd_connect, 917 pru_connect2_notsupp, 918 pru_control_notsupp, 919 ngd_detach, 920 NULL, /* disconnect */ 921 pru_listen_notsupp, 922 NULL, /* setpeeraddr */ 923 pru_rcvd_notsupp, 924 pru_rcvoob_notsupp, 925 ngd_send, 926 pru_sense_null, 927 NULL, /* shutdown */ 928 ng_setsockaddr, 929 sosend, 930 soreceive, 931 sopoll 932}; 933 934/* 935 * Definitions of protocols supported in the NETGRAPH domain. 936 */ 937 938extern struct domain ngdomain; /* stop compiler warnings */ 939 940static struct protosw ngsw[] = { 941 { 942 SOCK_DGRAM, 943 &ngdomain, 944 NG_CONTROL, 945 PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, 946 0, 0, 0, 0, 947 NULL, 948 0, 0, 0, 0, 949 &ngc_usrreqs 950 }, 951 { 952 SOCK_DGRAM, 953 &ngdomain, 954 NG_DATA, 955 PR_ATOMIC | PR_ADDR, 956 0, 0, 0, 0, 957 NULL, 958 0, 0, 0, 0, 959 &ngd_usrreqs 960 } 961}; 962 963struct domain ngdomain = { 964 AF_NETGRAPH, 965 "netgraph", 966 0, 967 NULL, 968 NULL, 969 ngsw, 970 &ngsw[sizeof(ngsw) / sizeof(ngsw[0])], 971 0, 972 NULL, 973 0, 974 0 975}; 976 977/* 978 * Handle loading and unloading for this node type 979 * This is to handle auxiliary linkages (e.g protocol domain addition). 980 */ 981static int 982ngs_mod_event(module_t mod, int event, void *data) 983{ 984 int error = 0; 985 986 switch (event) { 987 case MOD_LOAD: 988 /* Register protocol domain */ 989 net_add_domain(&ngdomain); 990 break; 991 case MOD_UNLOAD: 992 /* Insure there are no open netgraph sockets */ 993 if (!LIST_EMPTY(&ngsocklist)) { 994 error = EBUSY; 995 break; 996 } 997 998#ifdef NOTYET 999 /* Unregister protocol domain XXX can't do this yet.. */ 1000 if ((error = net_rm_domain(&ngdomain)) != 0) 1001 break; 1002#else 1003 error = EBUSY; 1004#endif 1005 break; 1006 default: 1007 error = EOPNOTSUPP; 1008 break; 1009 } 1010 return (error); 1011} 1012 1013SYSCTL_NODE(_net, AF_NETGRAPH, graph, CTLFLAG_RW, 0, "netgraph Family"); 1014SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, ""); 1015SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA"); 1016SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, ""); 1017SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL"); 1018SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, ""); 1019 1020