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 * $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/caps.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 #ifdef NOTYET 67 #include <sys/vnode.h> 68 #endif 69 70 #include <sys/thread2.h> 71 #include <sys/socketvar2.h> 72 #include <sys/msgport2.h> 73 74 #include <netgraph/ng_message.h> 75 #include <netgraph/netgraph.h> 76 #include "ng_socketvar.h" 77 #include "ng_socket.h" 78 79 /* 80 * It's Ascii-art time! 81 * +-------------+ +-------------+ 82 * |socket (ctl)| |socket (data)| 83 * +-------------+ +-------------+ 84 * ^ ^ 85 * | | 86 * v v 87 * +-----------+ +-----------+ 88 * |pcb (ctl)| |pcb (data)| 89 * +-----------+ +-----------+ 90 * ^ ^ 91 * | | 92 * v v 93 * +--------------------------+ 94 * | Socket type private | 95 * | data | 96 * +--------------------------+ 97 * ^ 98 * | 99 * v 100 * +----------------+ 101 * | struct ng_node | 102 * +----------------+ 103 */ 104 105 /* Netgraph node methods */ 106 static ng_constructor_t ngs_constructor; 107 static ng_rcvmsg_t ngs_rcvmsg; 108 static ng_shutdown_t ngs_rmnode; 109 static ng_newhook_t ngs_newhook; 110 static ng_rcvdata_t ngs_rcvdata; 111 static ng_disconnect_t ngs_disconnect; 112 113 /* Internal methods */ 114 static int ng_attach_data(struct socket *so); 115 static int ng_attach_cntl(struct socket *so); 116 static int ng_attach_common(struct socket *so, int type); 117 static void ng_detach_common(struct ngpcb *pcbp, int type); 118 /*static int ng_internalize(struct mbuf *m, struct thread *td); */ 119 120 static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp); 121 static int ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp); 122 static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp); 123 124 static int ngs_mod_event(module_t mod, int event, void *data); 125 static int ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, 126 struct sockaddr_ng *addr); 127 128 /* Netgraph type descriptor */ 129 static struct ng_type typestruct = { 130 NG_VERSION, 131 NG_SOCKET_NODE_TYPE, 132 ngs_mod_event, 133 ngs_constructor, 134 ngs_rcvmsg, 135 ngs_rmnode, 136 ngs_newhook, 137 NULL, 138 NULL, 139 ngs_rcvdata, 140 ngs_rcvdata, 141 ngs_disconnect, 142 NULL 143 }; 144 NETGRAPH_INIT(socket, &typestruct); 145 146 /* Buffer space */ 147 static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */ 148 static u_long ngpdg_recvspace = 20 * 1024; 149 150 /* List of all sockets */ 151 LIST_HEAD(, ngpcb) ngsocklist; 152 153 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb) 154 155 /* If getting unexplained errors returned, set this to "Debugger("X"); */ 156 #ifndef TRAP_ERROR 157 #define TRAP_ERROR 158 #endif 159 160 /*************************************************************** 161 Control sockets 162 ***************************************************************/ 163 164 static void 165 ngc_attach(netmsg_t msg) 166 { 167 struct socket *so = msg->attach.base.nm_so; 168 struct pru_attach_info *ai = msg->attach.nm_ai; 169 struct ngpcb *const pcbp = sotongpcb(so); 170 int error; 171 172 if (caps_priv_check(ai->p_ucred, 173 SYSCAP_RESTRICTEDROOT | __SYSCAP_NULLCRED) != 0) 174 { 175 error = EPERM; 176 } 177 else if (pcbp != NULL) 178 error = EISCONN; 179 else 180 error = ng_attach_cntl(so); 181 lwkt_replymsg(&msg->attach.base.lmsg, error); 182 } 183 184 static void 185 ngc_detach(netmsg_t msg) 186 { 187 struct socket *so = msg->detach.base.nm_so; 188 struct ngpcb *const pcbp = sotongpcb(so); 189 int error; 190 191 if (pcbp) { 192 ng_detach_common(pcbp, NG_CONTROL); 193 error = 0; 194 } else { 195 error = EINVAL; 196 } 197 lwkt_replymsg(&msg->detach.base.lmsg, error); 198 } 199 200 static void 201 ngc_send(netmsg_t msg) 202 { 203 struct socket *so = msg->send.base.nm_so; 204 struct mbuf *m = msg->send.nm_m; 205 struct sockaddr *addr = msg->send.nm_addr; 206 struct mbuf *control = msg->send.nm_control; 207 struct ngpcb *const pcbp = sotongpcb(so); 208 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 209 struct ng_mesg *resp; 210 struct mbuf *m0; 211 char *xmsg, *path = NULL; 212 int len; 213 int error = 0; 214 215 if (pcbp == NULL) { 216 error = EINVAL; 217 goto release; 218 } 219 #ifdef NOTYET 220 if (control && (error = ng_internalize(control, p))) { 221 if (pcbp->sockdata == NULL) { 222 error = ENOTCONN; 223 goto release; 224 } 225 } 226 #else /* NOTYET */ 227 if (control) { 228 error = EINVAL; 229 goto release; 230 } 231 #endif /* NOTYET */ 232 233 /* Require destination as there may be >= 1 hooks on this node */ 234 if (addr == NULL) { 235 error = EDESTADDRREQ; 236 goto release; 237 } 238 239 /* Allocate an expendable buffer for the path, chop off 240 * the sockaddr header, and make sure it's NUL terminated */ 241 len = sap->sg_len - 2; 242 path = kmalloc(len + 1, M_NETGRAPH, M_WAITOK); 243 bcopy(sap->sg_data, path, len); 244 path[len] = '\0'; 245 246 /* Move the actual message out of mbufs into a linear buffer. 247 * Start by adding up the size of the data. (could use mh_len?) */ 248 for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next) 249 len += m0->m_len; 250 251 /* Move the data into a linear buffer as well. Messages are not 252 * delivered in mbufs. */ 253 xmsg = kmalloc(len + 1, M_NETGRAPH, M_WAITOK); 254 m_copydata(m, 0, len, xmsg); 255 256 /* The callee will free the xmsg when done. The addr is our business. */ 257 error = ng_send_msg(pcbp->sockdata->node, 258 (struct ng_mesg *) xmsg, path, &resp); 259 260 /* If the callee responded with a synchronous response, then put it 261 * back on the receive side of the socket; sap is source address. */ 262 if (error == 0 && resp != NULL) 263 error = ship_msg(pcbp, resp, sap); 264 265 release: 266 if (path != NULL) 267 kfree(path, M_NETGRAPH); 268 if (control != NULL) 269 m_freem(control); 270 if (m != NULL) 271 m_freem(m); 272 lwkt_replymsg(&msg->send.base.lmsg, error); 273 } 274 275 static void 276 ngc_bind(netmsg_t msg) 277 { 278 struct socket *so = msg->bind.base.nm_so; 279 struct sockaddr *nam = msg->bind.nm_nam; 280 struct ngpcb *const pcbp = sotongpcb(so); 281 int error; 282 283 if (pcbp) 284 error = ng_bind(nam, pcbp); 285 else 286 error = EINVAL; 287 lwkt_replymsg(&msg->bind.base.lmsg, error); 288 } 289 290 static void 291 ngc_connect(netmsg_t msg) 292 { 293 struct socket *so = msg->connect.base.nm_so; 294 struct sockaddr *nam = msg->connect.nm_nam; 295 struct ngpcb *const pcbp = sotongpcb(so); 296 int error; 297 298 if (pcbp) 299 error = ng_connect_cntl(nam, pcbp); 300 else 301 error = EINVAL; 302 lwkt_replymsg(&msg->connect.base.lmsg, error); 303 } 304 305 /*************************************************************** 306 Data sockets 307 ***************************************************************/ 308 309 static void 310 ngd_attach(netmsg_t msg) 311 { 312 struct socket *so = msg->attach.base.nm_so; 313 struct ngpcb *const pcbp = sotongpcb(so); 314 int error; 315 316 if (pcbp) 317 error = EISCONN; 318 else 319 error = ng_attach_data(so); 320 lwkt_replymsg(&msg->connect.base.lmsg, error); 321 } 322 323 static void 324 ngd_detach(netmsg_t msg) 325 { 326 struct socket *so = msg->detach.base.nm_so; 327 struct ngpcb *const pcbp = sotongpcb(so); 328 int error; 329 330 if (pcbp) { 331 ng_detach_common(pcbp, NG_DATA); 332 error = 0; 333 } else { 334 error = EINVAL; 335 } 336 lwkt_replymsg(&msg->detach.base.lmsg, error); 337 } 338 339 static void 340 ngd_send(netmsg_t msg) 341 { 342 struct socket *so = msg->send.base.nm_so; 343 struct mbuf *m = msg->send.nm_m; 344 struct sockaddr *addr = msg->send.nm_addr; 345 struct mbuf *control = msg->send.nm_control; 346 struct ngpcb *const pcbp = sotongpcb(so); 347 struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; 348 meta_p mp = NULL; 349 int len, error; 350 hook_p hook = NULL; 351 char hookname[NG_HOOKSIZ]; 352 353 if ((pcbp == NULL) || (control != NULL)) { 354 error = EINVAL; 355 goto release; 356 } 357 if (pcbp->sockdata == NULL) { 358 error = ENOTCONN; 359 goto release; 360 } 361 /* 362 * If the user used any of these ways to not specify an address 363 * then handle specially. 364 */ 365 if ((sap == NULL) 366 || ((len = sap->sg_len - 2) <= 0) 367 || (*sap->sg_data == '\0')) { 368 if (pcbp->sockdata->node->numhooks != 1) { 369 error = EDESTADDRREQ; 370 goto release; 371 } 372 /* 373 * if exactly one hook exists, just use it. 374 * Special case to allow write(2) to work on an ng_socket. 375 */ 376 hook = LIST_FIRST(&pcbp->sockdata->node->hooks); 377 } else { 378 if (len >= NG_HOOKSIZ) { 379 error = EINVAL; 380 goto release; 381 } 382 383 /* 384 * chop off the sockaddr header, and make sure it's NUL 385 * terminated 386 */ 387 bcopy(sap->sg_data, hookname, len); 388 hookname[len] = '\0'; 389 390 /* Find the correct hook from 'hookname' */ 391 LIST_FOREACH(hook, &pcbp->sockdata->node->hooks, hooks) { 392 if (strcmp(hookname, hook->name) == 0) 393 break; 394 } 395 if (hook == NULL) 396 error = EHOSTUNREACH; 397 } 398 399 /* Send data (OK if hook is NULL) */ 400 NG_SEND_DATA(error, hook, m, mp); /* makes m NULL */ 401 402 release: 403 if (control != NULL) 404 m_freem(control); 405 if (m != NULL) 406 m_freem(m); 407 lwkt_replymsg(&msg->send.base.lmsg, error); 408 } 409 410 static void 411 ngd_connect(netmsg_t msg) 412 { 413 struct socket *so = msg->connect.base.nm_so; 414 struct sockaddr *nam = msg->connect.nm_nam; 415 struct ngpcb *const pcbp = sotongpcb(so); 416 int error; 417 418 if (pcbp) { 419 error = ng_connect_data(nam, pcbp); 420 } else { 421 error = EINVAL; 422 } 423 lwkt_replymsg(&msg->connect.base.lmsg, error); 424 } 425 426 /* 427 * Used for both data and control sockets 428 */ 429 static void 430 ng_setsockaddr(netmsg_t msg) 431 { 432 struct socket *so = msg->sockaddr.base.nm_so; 433 struct sockaddr **addr = msg->sockaddr.nm_nam; 434 struct ngpcb *pcbp; 435 struct sockaddr_ng *sg; 436 int sg_len, namelen; 437 int error; 438 439 /* Why isn't sg_data a `char[1]' ? :-( */ 440 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1; 441 442 crit_enter(); 443 pcbp = sotongpcb(so); 444 if ((pcbp == NULL) || (pcbp->sockdata == NULL)) { 445 crit_exit(); 446 error = EINVAL; 447 goto out; 448 } 449 450 namelen = 0; /* silence compiler ! */ 451 452 if (pcbp->sockdata->node->name != NULL) 453 sg_len += namelen = strlen(pcbp->sockdata->node->name); 454 455 sg = kmalloc(sg_len, M_SONAME, M_WAITOK | M_ZERO); 456 457 if (pcbp->sockdata->node->name != NULL) 458 bcopy(pcbp->sockdata->node->name, sg->sg_data, namelen); 459 crit_exit(); 460 461 sg->sg_len = sg_len; 462 sg->sg_family = AF_NETGRAPH; 463 *addr = (struct sockaddr *)sg; 464 error = 0; 465 out: 466 lwkt_replymsg(&msg->sockaddr.base.lmsg, error); 467 } 468 469 /* 470 * Attach a socket to it's protocol specific partner. 471 * For a control socket, actually create a netgraph node and attach 472 * to it as well. 473 */ 474 475 static int 476 ng_attach_cntl(struct socket *so) 477 { 478 struct ngsock *privdata; 479 struct ngpcb *pcbp; 480 int error; 481 482 /* Setup protocol control block */ 483 if ((error = ng_attach_common(so, NG_CONTROL)) != 0) 484 return (error); 485 pcbp = sotongpcb(so); 486 487 /* Allocate node private info */ 488 privdata = kmalloc(sizeof(*privdata), M_NETGRAPH, M_WAITOK | M_ZERO); 489 490 /* Make the generic node components */ 491 if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) { 492 kfree(privdata, M_NETGRAPH); 493 ng_detach_common(pcbp, NG_CONTROL); 494 return (error); 495 } 496 privdata->node->private = privdata; 497 498 /* Link the pcb and the node private data */ 499 privdata->ctlsock = pcbp; 500 pcbp->sockdata = privdata; 501 privdata->refs++; 502 return (0); 503 } 504 505 static int 506 ng_attach_data(struct socket *so) 507 { 508 return(ng_attach_common(so, NG_DATA)); 509 } 510 511 /* 512 * Set up a socket protocol control block. 513 * This code is shared between control and data sockets. 514 */ 515 static int 516 ng_attach_common(struct socket *so, int type) 517 { 518 struct ngpcb *pcbp; 519 int error; 520 521 /* Standard socket setup stuff */ 522 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace, NULL); 523 if (error) 524 return (error); 525 526 /* Allocate the pcb */ 527 pcbp = kmalloc(sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO); 528 pcbp->type = type; 529 530 /* Link the pcb and the socket */ 531 soreference(so); 532 so->so_pcb = (caddr_t) pcbp; 533 pcbp->ng_socket = so; 534 535 /* Add the socket to linked list */ 536 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks); 537 return (0); 538 } 539 540 /* 541 * Disassociate the socket from it's protocol specific 542 * partner. If it's attached to a node's private data structure, 543 * then unlink from that too. If we were the last socket attached to it, 544 * then shut down the entire node. Shared code for control and data sockets. 545 */ 546 static void 547 ng_detach_common(struct ngpcb *pcbp, int which) 548 { 549 struct ngsock *sockdata; 550 struct socket *so; 551 552 if (pcbp->sockdata) { 553 sockdata = pcbp->sockdata; 554 pcbp->sockdata = NULL; 555 switch (which) { 556 case NG_CONTROL: 557 sockdata->ctlsock = NULL; 558 break; 559 case NG_DATA: 560 sockdata->datasock = NULL; 561 break; 562 default: 563 panic(__func__); 564 } 565 if ((--sockdata->refs == 0) && (sockdata->node != NULL)) 566 ng_rmnode(sockdata->node); 567 } 568 so = pcbp->ng_socket; 569 so->so_pcb = NULL; 570 pcbp->ng_socket = NULL; 571 sofree(so); /* remove pcb ref */ 572 573 LIST_REMOVE(pcbp, socks); 574 kfree(pcbp, M_PCB); 575 } 576 577 #ifdef NOTYET 578 /* 579 * File descriptors can be passed into a AF_NETGRAPH socket. 580 * Note, that file descriptors cannot be passed OUT. 581 * Only character device descriptors are accepted. 582 * Character devices are useful to connect a graph to a device, 583 * which after all is the purpose of this whole system. 584 */ 585 static int 586 ng_internalize(struct mbuf *control, struct thread *td) 587 { 588 struct filedesc *fdp = p->p_fd; 589 const struct cmsghdr *cm = mtod(control, const struct cmsghdr *); 590 struct file *fp; 591 struct vnode *vn; 592 int oldfds; 593 int fd; 594 595 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || 596 cm->cmsg_len != control->m_len) { 597 TRAP_ERROR; 598 return (EINVAL); 599 } 600 601 /* Check there is only one FD. XXX what would more than one signify? */ 602 oldfds = (cm->cmsg_len - sizeof(*cm)) / sizeof(int); 603 if (oldfds != 1) { 604 TRAP_ERROR; 605 return (EINVAL); 606 } 607 608 /* Check that the FD given is legit. and change it to a pointer to a 609 * struct file. */ 610 fd = *(int *) (cm + 1); 611 if ((unsigned) fd >= fdp->fd_nfiles 612 || (fp = fdp->fd_files[fd].fp) == NULL) { 613 return (EBADF); 614 } 615 616 /* Depending on what kind of resource it is, act differently. For 617 * devices, we treat it as a file. For a AF_NETGRAPH socket, 618 * shortcut straight to the node. */ 619 switch (fp->f_type) { 620 case DTYPE_VNODE: 621 vn = (struct vnode *) fp->f_data; 622 if (vn && (vn->v_type == VCHR)) { 623 /* for a VCHR, actually reference the FILE */ 624 fhold(fp); 625 /* XXX then what :) */ 626 /* how to pass on to other modules? */ 627 } else { 628 TRAP_ERROR; 629 return (EINVAL); 630 } 631 break; 632 default: 633 TRAP_ERROR; 634 return (EINVAL); 635 } 636 return (0); 637 } 638 #endif /* NOTYET */ 639 640 /* 641 * Connect the data socket to a named control socket node. 642 */ 643 static int 644 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp) 645 { 646 struct sockaddr_ng *sap; 647 node_p farnode; 648 struct ngsock *sockdata; 649 int error; 650 651 /* If we are already connected, don't do it again */ 652 if (pcbp->sockdata != NULL) 653 return (EISCONN); 654 655 /* Find the target (victim) and check it doesn't already have a data 656 * socket. Also check it is a 'socket' type node. */ 657 sap = (struct sockaddr_ng *) nam; 658 if ((error = ng_path2node(NULL, sap->sg_data, &farnode, NULL))) 659 return (error); 660 661 if (strcmp(farnode->type->name, NG_SOCKET_NODE_TYPE) != 0) 662 return (EINVAL); 663 sockdata = farnode->private; 664 if (sockdata->datasock != NULL) 665 return (EADDRINUSE); 666 667 /* Link the PCB and the private data struct. and note the extra 668 * reference */ 669 sockdata->datasock = pcbp; 670 pcbp->sockdata = sockdata; 671 sockdata->refs++; 672 return (0); 673 } 674 675 /* 676 * Connect the existing control socket node to a named node:hook. 677 * The hook we use on this end is the same name as the remote node name. 678 */ 679 static int 680 ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp) 681 { 682 struct ngsock *const sockdata = pcbp->sockdata; 683 struct sockaddr_ng *sap; 684 char *node, *hook; 685 node_p farnode; 686 int rtn, error; 687 688 sap = (struct sockaddr_ng *) nam; 689 rtn = ng_path_parse(sap->sg_data, &node, NULL, &hook); 690 if (rtn < 0 || node == NULL || hook == NULL) { 691 TRAP_ERROR; 692 return (EINVAL); 693 } 694 farnode = ng_findname(sockdata->node, node); 695 if (farnode == NULL) { 696 TRAP_ERROR; 697 return (EADDRNOTAVAIL); 698 } 699 700 /* Connect, using a hook name the same as the far node name. */ 701 error = ng_con_nodes(sockdata->node, node, farnode, hook); 702 return error; 703 } 704 705 /* 706 * Binding a socket means giving the corresponding node a name 707 */ 708 static int 709 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp) 710 { 711 struct ngsock *const sockdata = pcbp->sockdata; 712 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam; 713 714 if (sockdata == NULL) { 715 TRAP_ERROR; 716 return (EINVAL); 717 } 718 if (sap->sg_len < 3 || sap->sg_data[sap->sg_len - 3] != '\0') { 719 TRAP_ERROR; 720 return (EINVAL); 721 } 722 return (ng_name_node(sockdata->node, sap->sg_data)); 723 } 724 725 /* 726 * Take a message and pass it up to the control socket associated 727 * with the node. 728 */ 729 static int 730 ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr) 731 { 732 struct socket *const so = pcbp->ng_socket; 733 struct mbuf *mdata; 734 int msglen; 735 736 /* Copy the message itself into an mbuf chain */ 737 msglen = sizeof(struct ng_mesg) + msg->header.arglen; 738 mdata = m_devget(msg, msglen, 0, NULL); 739 740 /* Here we free the message, as we are the end of the line. 741 * We need to do that regardless of whether we got mbufs. */ 742 kfree(msg, M_NETGRAPH); 743 744 if (mdata == NULL) { 745 TRAP_ERROR; 746 return (ENOBUFS); 747 } 748 749 /* Send it up to the socket */ 750 lwkt_gettoken(&so->so_rcv.ssb_token); 751 if (ssb_appendaddr(&so->so_rcv, 752 (struct sockaddr *) addr, mdata, NULL) == 0) { 753 soroverflow(so); 754 lwkt_reltoken(&so->so_rcv.ssb_token); 755 TRAP_ERROR; 756 m_freem(mdata); 757 return (ENOBUFS); 758 } 759 sorwakeup(so); 760 lwkt_reltoken(&so->so_rcv.ssb_token); 761 return (0); 762 } 763 764 /* 765 * You can only create new nodes from the socket end of things. 766 */ 767 static int 768 ngs_constructor(node_p *nodep) 769 { 770 return (EINVAL); 771 } 772 773 /* 774 * We allow any hook to be connected to the node. 775 * There is no per-hook private information though. 776 */ 777 static int 778 ngs_newhook(node_p node, hook_p hook, const char *name) 779 { 780 hook->private = node->private; 781 return (0); 782 } 783 784 /* 785 * Incoming messages get passed up to the control socket. 786 * Unless they are for us specifically (socket_type) 787 */ 788 static int 789 ngs_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, 790 struct ng_mesg **resp) 791 { 792 struct ngsock *const sockdata = node->private; 793 struct ngpcb *const pcbp = sockdata->ctlsock; 794 struct sockaddr_ng *addr; 795 int addrlen; 796 int error = 0; 797 798 /* Only allow mesgs to be passed if we have the control socket. 799 * Data sockets can only support the generic messages. */ 800 if (pcbp == NULL) { 801 TRAP_ERROR; 802 return (EINVAL); 803 } 804 805 if (msg->header.typecookie == NGM_SOCKET_COOKIE) { 806 switch (msg->header.cmd) { 807 case NGM_SOCK_CMD_NOLINGER: 808 sockdata->flags |= NGS_FLAG_NOLINGER; 809 break; 810 case NGM_SOCK_CMD_LINGER: 811 sockdata->flags &= ~NGS_FLAG_NOLINGER; 812 break; 813 default: 814 error = EINVAL; /* unknown command */ 815 } 816 /* Free the message and return */ 817 kfree(msg, M_NETGRAPH); 818 return(error); 819 820 } 821 /* Get the return address into a sockaddr */ 822 if ((retaddr == NULL) || (*retaddr == '\0')) 823 retaddr = ""; 824 addrlen = strlen(retaddr); 825 addr = kmalloc(addrlen + 4, M_NETGRAPH, M_NOWAIT); 826 if (addr == NULL) { 827 TRAP_ERROR; 828 return (ENOMEM); 829 } 830 addr->sg_len = addrlen + 3; 831 addr->sg_family = AF_NETGRAPH; 832 bcopy(retaddr, addr->sg_data, addrlen); 833 addr->sg_data[addrlen] = '\0'; 834 835 /* Send it up */ 836 error = ship_msg(pcbp, msg, addr); 837 kfree(addr, M_NETGRAPH); 838 return (error); 839 } 840 841 /* 842 * Receive data on a hook 843 */ 844 static int 845 ngs_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 846 { 847 struct ngsock *const sockdata = hook->node->private; 848 struct ngpcb *const pcbp = sockdata->datasock; 849 struct socket *so; 850 struct sockaddr_ng *addr; 851 char *addrbuf[NG_HOOKSIZ + 4]; 852 int addrlen; 853 854 /* If there is no data socket, black-hole it */ 855 if (pcbp == NULL) { 856 NG_FREE_DATA(m, meta); 857 return (0); 858 } 859 so = pcbp->ng_socket; 860 861 /* Get the return address into a sockaddr. */ 862 addrlen = strlen(hook->name); /* <= NG_HOOKSIZ - 1 */ 863 addr = (struct sockaddr_ng *) addrbuf; 864 addr->sg_len = addrlen + 3; 865 addr->sg_family = AF_NETGRAPH; 866 bcopy(hook->name, addr->sg_data, addrlen); 867 addr->sg_data[addrlen] = '\0'; 868 869 /* We have no use for the meta data, free/clear it now. */ 870 NG_FREE_META(meta); 871 872 /* Try to tell the socket which hook it came in on */ 873 lwkt_gettoken(&so->so_rcv.ssb_token); 874 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) { 875 soroverflow(so); 876 lwkt_reltoken(&so->so_rcv.ssb_token); 877 m_freem(m); 878 TRAP_ERROR; 879 return (ENOBUFS); 880 } 881 sorwakeup(so); 882 lwkt_reltoken(&so->so_rcv.ssb_token); 883 return (0); 884 } 885 886 /* 887 * Hook disconnection 888 * 889 * For this type, removal of the last link destroys the node 890 * if the NOLINGER flag is set. 891 */ 892 static int 893 ngs_disconnect(hook_p hook) 894 { 895 struct ngsock *const sockdata = hook->node->private; 896 897 if ((sockdata->flags & NGS_FLAG_NOLINGER ) 898 && (hook->node->numhooks == 0)) { 899 ng_rmnode(hook->node); 900 } 901 return (0); 902 } 903 904 /* 905 * Do local shutdown processing. 906 * In this case, that involves making sure the socket 907 * knows we should be shutting down. 908 */ 909 static int 910 ngs_rmnode(node_p node) 911 { 912 struct ngsock *const sockdata = node->private; 913 struct ngpcb *const dpcbp = sockdata->datasock; 914 struct ngpcb *const pcbp = sockdata->ctlsock; 915 916 ng_cutlinks(node); 917 ng_unname(node); 918 919 if (dpcbp != NULL) { 920 soisdisconnected(dpcbp->ng_socket); 921 dpcbp->sockdata = NULL; 922 sockdata->datasock = NULL; 923 sockdata->refs--; 924 } 925 if (pcbp != NULL) { 926 soisdisconnected(pcbp->ng_socket); 927 pcbp->sockdata = NULL; 928 sockdata->ctlsock = NULL; 929 sockdata->refs--; 930 } 931 node->private = NULL; 932 ng_unref(node); 933 kfree(sockdata, M_NETGRAPH); 934 return (0); 935 } 936 937 /* 938 * Control and data socket type descriptors 939 */ 940 941 static struct pr_usrreqs ngc_usrreqs = { 942 .pru_abort = NULL, 943 .pru_accept = pr_generic_notsupp, 944 .pru_attach = ngc_attach, 945 .pru_bind = ngc_bind, 946 .pru_connect = ngc_connect, 947 .pru_connect2 = pr_generic_notsupp, 948 .pru_control = pr_generic_notsupp, 949 .pru_detach = ngc_detach, 950 .pru_disconnect = NULL, 951 .pru_listen = pr_generic_notsupp, 952 .pru_peeraddr = NULL, 953 .pru_rcvd = pr_generic_notsupp, 954 .pru_rcvoob = pr_generic_notsupp, 955 .pru_send = ngc_send, 956 .pru_sense = pru_sense_null, 957 .pru_shutdown = NULL, 958 .pru_sockaddr = ng_setsockaddr, 959 .pru_sosend = sosend, 960 .pru_soreceive = soreceive 961 }; 962 963 static struct pr_usrreqs ngd_usrreqs = { 964 .pru_abort = NULL, 965 .pru_accept = pr_generic_notsupp, 966 .pru_attach = ngd_attach, 967 .pru_bind = NULL, 968 .pru_connect = ngd_connect, 969 .pru_connect2 = pr_generic_notsupp, 970 .pru_control = pr_generic_notsupp, 971 .pru_detach = ngd_detach, 972 .pru_disconnect = NULL, 973 .pru_listen = pr_generic_notsupp, 974 .pru_peeraddr = NULL, 975 .pru_rcvd = pr_generic_notsupp, 976 .pru_rcvoob = pr_generic_notsupp, 977 .pru_send = ngd_send, 978 .pru_sense = pru_sense_null, 979 .pru_shutdown = NULL, 980 .pru_sockaddr = ng_setsockaddr, 981 .pru_sosend = sosend, 982 .pru_soreceive = soreceive 983 }; 984 985 /* 986 * Definitions of protocols supported in the NETGRAPH domain. 987 */ 988 989 extern struct domain ngdomain; /* stop compiler warnings */ 990 991 static struct protosw ngsw[] = { 992 { 993 .pr_type = SOCK_DGRAM, 994 .pr_domain = &ngdomain, 995 .pr_protocol = NG_CONTROL, 996 .pr_flags = PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, 997 .pr_usrreqs = &ngc_usrreqs 998 }, 999 { 1000 .pr_type = SOCK_DGRAM, 1001 .pr_domain = &ngdomain, 1002 .pr_protocol = NG_DATA, 1003 .pr_flags = PR_ATOMIC | PR_ADDR, 1004 .pr_usrreqs = &ngd_usrreqs 1005 } 1006 }; 1007 1008 struct domain ngdomain = { 1009 .dom_family = AF_NETGRAPH, 1010 .dom_name = "netgraph", 1011 .dom_protosw = ngsw, 1012 .dom_protoswNPROTOSW = &ngsw[NELEM(ngsw)], 1013 }; 1014 1015 /* 1016 * Handle loading and unloading for this node type 1017 * This is to handle auxiliary linkages (e.g protocol domain addition). 1018 */ 1019 static int 1020 ngs_mod_event(module_t mod, int event, void *data) 1021 { 1022 int error = 0; 1023 1024 switch (event) { 1025 case MOD_LOAD: 1026 /* Register protocol domain */ 1027 net_add_domain(&ngdomain); 1028 break; 1029 case MOD_UNLOAD: 1030 /* Insure there are no open netgraph sockets */ 1031 if (!LIST_EMPTY(&ngsocklist)) { 1032 error = EBUSY; 1033 break; 1034 } 1035 1036 #ifdef NOTYET 1037 /* Unregister protocol domain XXX can't do this yet.. */ 1038 if ((error = net_rm_domain(&ngdomain)) != 0) 1039 break; 1040 #else 1041 error = EBUSY; 1042 #endif 1043 break; 1044 default: 1045 error = EOPNOTSUPP; 1046 break; 1047 } 1048 return (error); 1049 } 1050 1051 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, ""); 1052 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA"); 1053 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, ""); 1054 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL"); 1055 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, ""); 1056 1057