ng_socket.c revision 53498
1 2/* 3 * ng_socket.c 4 * 5 * Copyright (c) 1996-1999 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Author: Julian Elischer <julian@whistle.com> 38 * 39 * $FreeBSD: head/sys/netgraph/ng_socket.c 53498 1999-11-21 10:43:05Z 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/proc.h> 54#include <sys/domain.h> 55#include <sys/errno.h> 56#include <sys/kernel.h> 57#include <sys/file.h> 58#include <sys/filedesc.h> 59#include <sys/malloc.h> 60#include <sys/queue.h> 61#include <sys/mbuf.h> 62#include <sys/protosw.h> 63#include <sys/socket.h> 64#include <sys/socketvar.h> 65#include <sys/sysctl.h> 66#ifdef NOTYET 67#include <sys/vnode.h> 68#endif 69#include <netgraph/ng_message.h> 70#include <netgraph/netgraph.h> 71#include <netgraph/ng_socketvar.h> 72#include <netgraph/ng_socket.h> 73 74/* 75 * It's Ascii-art time! 76 * +-------------+ +-------------+ 77 * |socket (ctl)| |socket (data)| 78 * +-------------+ +-------------+ 79 * ^ ^ 80 * | | 81 * v v 82 * +-----------+ +-----------+ 83 * |pcb (ctl)| |pcb (data)| 84 * +-----------+ +-----------+ 85 * ^ ^ 86 * | | 87 * v v 88 * +--------------------------+ 89 * | Socket type private | 90 * | data | 91 * +--------------------------+ 92 * ^ 93 * | 94 * v 95 * +----------------+ 96 * | struct ng_node | 97 * +----------------+ 98 */ 99 100/* Netgraph node methods */ 101static ng_constructor_t ngs_constructor; 102static ng_rcvmsg_t ngs_rcvmsg; 103static ng_shutdown_t ngs_rmnode; 104static ng_newhook_t ngs_newhook; 105static ng_rcvdata_t ngs_rcvdata; 106static ng_disconnect_t ngs_disconnect; 107 108/* Internal methods */ 109static int ng_attach_data(struct socket *so); 110static int ng_attach_cntl(struct socket *so); 111static int ng_attach_common(struct socket *so, int type); 112static void ng_detach_common(struct ngpcb *pcbp, int type); 113/*static int ng_internalize(struct mbuf *m, struct proc *p); */ 114 115static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp); 116static int ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp); 117static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp); 118 119static int ngs_mod_event(module_t mod, int event, void *data); 120static int ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, 121 struct sockaddr_ng *addr); 122 123/* Netgraph type descriptor */ 124static struct ng_type typestruct = { 125 NG_VERSION, 126 NG_SOCKET_NODE_TYPE, 127 ngs_mod_event, 128 ngs_constructor, 129 ngs_rcvmsg, 130 ngs_rmnode, 131 ngs_newhook, 132 NULL, 133 NULL, 134 ngs_rcvdata, 135 ngs_rcvdata, 136 ngs_disconnect 137}; 138NETGRAPH_INIT(socket, &typestruct); 139 140/* Buffer space */ 141static u_long ngpdg_sendspace = 2 * 1024; /* really max datagram size */ 142static u_long ngpdg_recvspace = 20 * 1024; 143 144/* List of all sockets */ 145LIST_HEAD(, ngpcb) ngsocklist; 146 147#define sotongpcb(so) ((struct ngpcb *)so->so_pcb) 148 149/* If getting unexplained errors returned, set this to "Debugger("X"); */ 150#ifndef TRAP_ERROR 151#define TRAP_ERROR 152#endif 153 154/*************************************************************** 155 Control sockets 156***************************************************************/ 157 158static int 159ngc_attach(struct socket *so, int proto, struct proc *p) 160{ 161 struct ngpcb *const pcbp = sotongpcb(so); 162 163 if (pcbp != NULL) 164 return (EISCONN); 165 return (ng_attach_cntl(so)); 166} 167 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, &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 meta_p mp = NULL; 310 int len, error; 311 hook_p hook = NULL; 312 char hookname[NG_HOOKLEN + 1]; 313 314 if ((pcbp == NULL) || (control != NULL)) { 315 error = EINVAL; 316 goto release; 317 } 318 if (pcbp->sockdata == NULL) { 319 error = ENOTCONN; 320 goto release; 321 } 322 /* 323 * If the user used any of these ways to not specify an address 324 * then handle specially. 325 */ 326 if ((sap == NULL) 327 || ((len = sap->sg_len) <= 2) 328 || (*sap->sg_data == '\0')) { 329 if (pcbp->sockdata->node->numhooks != 1) { 330 error = EDESTADDRREQ; 331 goto release; 332 } 333 /* 334 * if exactly one hook exists, just use it. 335 * Special case to allow write(2) to work on an ng_socket. 336 */ 337 hook = LIST_FIRST(&pcbp->sockdata->node->hooks); 338 } else { 339 if (len > NG_HOOKLEN) { 340 error = EINVAL; 341 goto release; 342 } 343 344 /* 345 * chop off the sockaddr header, and make sure it's NUL 346 * terminated 347 */ 348 bcopy(sap->sg_data, hookname, len); 349 hookname[len] = '\0'; 350 351 /* Find the correct hook from 'hookname' */ 352 LIST_FOREACH(hook, &pcbp->sockdata->node->hooks, hooks) { 353 if (strcmp(hookname, hook->name) == 0) 354 break; 355 } 356 if (hook == NULL) 357 error = EHOSTUNREACH; 358 } 359 360 /* Send data (OK if hook is NULL) */ 361 NG_SEND_DATA(error, hook, m, mp); /* makes m NULL */ 362 363release: 364 if (hookname != NULL) 365 FREE(hookname, M_NETGRAPH); 366 if (control != NULL) 367 m_freem(control); 368 if (m != NULL) 369 m_freem(m); 370 return (error); 371} 372 373static int 374ngd_connect(struct socket *so, struct sockaddr *nam, struct proc *p) 375{ 376 struct ngpcb *const pcbp = sotongpcb(so); 377 378 if (pcbp == 0) 379 return (EINVAL); 380 return (ng_connect_data(nam, pcbp)); 381} 382 383/* 384 * Used for both data and control sockets 385 */ 386static int 387ng_setsockaddr(struct socket *so, struct sockaddr **addr) 388{ 389 struct ngpcb *pcbp; 390 struct sockaddr_ng *sg; 391 int sg_len, namelen, s; 392 393 /* Why isn't sg_data a `char[1]' ? :-( */ 394 sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1; 395 396 s = splnet(); 397 pcbp = sotongpcb(so); 398 if (pcbp == 0) { 399 splx(s); 400 return (EINVAL); 401 } 402 403 namelen = 0; /* silence compiler ! */ 404 405 if (pcbp->sockdata->node->name != NULL) 406 sg_len += namelen = strlen(pcbp->sockdata->node->name); 407 408 MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK); 409 bzero(sg, sg_len); 410 411 if (pcbp->sockdata->node->name != NULL) 412 bcopy(pcbp->sockdata->node->name, sg->sg_data, namelen); 413 splx(s); 414 415 sg->sg_len = sg_len; 416 sg->sg_family = AF_NETGRAPH; 417 *addr = (struct sockaddr *)sg; 418 419 return (0); 420} 421 422/* 423 * Attach a socket to it's protocol specific partner. 424 * For a control socket, actually create a netgraph node and attach 425 * to it as well. 426 */ 427 428static int 429ng_attach_cntl(struct socket *so) 430{ 431 struct ngsock *privdata; 432 struct ngpcb *pcbp; 433 int error; 434 435 /* Setup protocol control block */ 436 if ((error = ng_attach_common(so, NG_CONTROL)) != 0) 437 return (error); 438 pcbp = (struct ngpcb *) so->so_pcb; 439 440 /* Allocate node private info */ 441 MALLOC(privdata, struct ngsock *, 442 sizeof(*privdata), M_NETGRAPH, M_WAITOK); 443 if (privdata == NULL) { 444 ng_detach_common(pcbp, NG_CONTROL); 445 return (ENOMEM); 446 } 447 bzero(privdata, sizeof(*privdata)); 448 449 /* Make the generic node components */ 450 if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) { 451 FREE(privdata, M_NETGRAPH); 452 ng_detach_common(pcbp, NG_CONTROL); 453 return (error); 454 } 455 privdata->node->private = privdata; 456 457 /* Link the pcb and the node private data */ 458 privdata->ctlsock = pcbp; 459 pcbp->sockdata = privdata; 460 privdata->refs++; 461 return (0); 462} 463 464static int 465ng_attach_data(struct socket *so) 466{ 467 return(ng_attach_common(so, NG_DATA)); 468} 469 470/* 471 * Set up a socket protocol control block. 472 * This code is shared between control and data sockets. 473 */ 474static int 475ng_attach_common(struct socket *so, int type) 476{ 477 struct ngpcb *pcbp; 478 int error; 479 480 /* Standard socket setup stuff */ 481 error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace); 482 if (error) 483 return (error); 484 485 /* Allocate the pcb */ 486 MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK); 487 if (pcbp == NULL) 488 return (ENOMEM); 489 bzero(pcbp, sizeof(*pcbp)); 490 pcbp->type = type; 491 492 /* Link the pcb and the socket */ 493 so->so_pcb = (caddr_t) pcbp; 494 pcbp->ng_socket = so; 495 496 /* Add the socket to linked list */ 497 LIST_INSERT_HEAD(&ngsocklist, pcbp, socks); 498 return (0); 499} 500 501/* 502 * Disassociate the socket from it's protocol specific 503 * partner. If it's attached to a node's private data structure, 504 * then unlink from that too. If we were the last socket attached to it, 505 * then shut down the entire node. Shared code for control and data sockets. 506 */ 507static void 508ng_detach_common(struct ngpcb *pcbp, int which) 509{ 510 struct ngsock *sockdata; 511 512 if (pcbp->sockdata) { 513 sockdata = pcbp->sockdata; 514 pcbp->sockdata = NULL; 515 switch (which) { 516 case NG_CONTROL: 517 sockdata->ctlsock = NULL; 518 break; 519 case NG_DATA: 520 sockdata->datasock = NULL; 521 break; 522 default: 523 panic(__FUNCTION__); 524 } 525 if ((--sockdata->refs == 0) && (sockdata->node != NULL)) 526 ng_rmnode(sockdata->node); 527 } 528 pcbp->ng_socket->so_pcb = NULL; 529 pcbp->ng_socket = NULL; 530 LIST_REMOVE(pcbp, socks); 531 FREE(pcbp, M_PCB); 532} 533 534#ifdef NOTYET 535/* 536 * File descriptors can be passed into a AF_NETGRAPH socket. 537 * Note, that file descriptors cannot be passed OUT. 538 * Only character device descriptors are accepted. 539 * Character devices are useful to connect a graph to a device, 540 * which after all is the purpose of this whole system. 541 */ 542static int 543ng_internalize(struct mbuf *control, struct proc *p) 544{ 545 struct filedesc *fdp = p->p_fd; 546 struct cmsghdr *cm = mtod(control, struct cmsghdr *); 547 struct file *fp; 548 struct vnode *vn; 549 int oldfds; 550 int fd; 551 552 if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || 553 cm->cmsg_len != control->m_len) { 554 TRAP_ERROR; 555 return (EINVAL); 556 } 557 558 /* Check there is only one FD. XXX what would more than one signify? */ 559 oldfds = (cm->cmsg_len - sizeof(*cm)) / sizeof(int); 560 if (oldfds != 1) { 561 TRAP_ERROR; 562 return (EINVAL); 563 } 564 565 /* Check that the FD given is legit. and change it to a pointer to a 566 * struct file. */ 567 fd = *(int *) (cm + 1); 568 if ((unsigned) fd >= fdp->fd_nfiles 569 || (fp = fdp->fd_ofiles[fd]) == NULL) { 570 return (EBADF); 571 } 572 573 /* Depending on what kind of resource it is, act differently. For 574 * devices, we treat it as a file. For a AF_NETGRAPH socket, 575 * shortcut straight to the node. */ 576 switch (fp->f_type) { 577 case DTYPE_VNODE: 578 vn = (struct vnode *) fp->f_data; 579 if (vn && (vn->v_type == VCHR)) { 580 /* for a VCHR, actually reference the FILE */ 581 fp->f_count++; 582 /* XXX then what :) */ 583 /* how to pass on to other modules? */ 584 } else { 585 TRAP_ERROR; 586 return (EINVAL); 587 } 588 break; 589 default: 590 TRAP_ERROR; 591 return (EINVAL); 592 } 593 return (0); 594} 595#endif /* NOTYET */ 596 597/* 598 * Connect the data socket to a named control socket node. 599 */ 600static int 601ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp) 602{ 603 struct sockaddr_ng *sap; 604 node_p farnode; 605 struct ngsock *sockdata; 606 int error; 607 608 /* If we are already connected, don't do it again */ 609 if (pcbp->sockdata != NULL) 610 return (EISCONN); 611 612 /* Find the target (victim) and check it doesn't already have a data 613 * socket. Also check it is a 'socket' type node. */ 614 sap = (struct sockaddr_ng *) nam; 615 if ((error = ng_path2node(NULL, sap->sg_data, &farnode, NULL))) 616 return (error); 617 618 if (strcmp(farnode->type->name, NG_SOCKET_NODE_TYPE) != 0) 619 return (EINVAL); 620 sockdata = farnode->private; 621 if (sockdata->datasock != NULL) 622 return (EADDRINUSE); 623 624 /* Link the PCB and the private data struct. and note the extra 625 * reference */ 626 sockdata->datasock = pcbp; 627 pcbp->sockdata = sockdata; 628 sockdata->refs++; 629 return (0); 630} 631 632/* 633 * Connect the existing control socket node to a named node:hook. 634 * The hook we use on this end is the same name as the remote node name. 635 */ 636static int 637ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp) 638{ 639 struct ngsock *const sockdata = pcbp->sockdata; 640 struct sockaddr_ng *sap; 641 char *node, *hook; 642 node_p farnode; 643 int rtn, error; 644 645 sap = (struct sockaddr_ng *) nam; 646 rtn = ng_path_parse(sap->sg_data, &node, NULL, &hook); 647 if (rtn < 0 || node == NULL || hook == NULL) { 648 TRAP_ERROR; 649 return (EINVAL); 650 } 651 farnode = ng_findname(sockdata->node, node); 652 if (farnode == NULL) { 653 TRAP_ERROR; 654 return (EADDRNOTAVAIL); 655 } 656 657 /* Connect, using a hook name the same as the far node name. */ 658 error = ng_con_nodes(sockdata->node, node, farnode, hook); 659 return error; 660} 661 662/* 663 * Binding a socket means giving the corresponding node a name 664 */ 665static int 666ng_bind(struct sockaddr *nam, struct ngpcb *pcbp) 667{ 668 struct ngsock *const sockdata = pcbp->sockdata; 669 struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam; 670 671 if (sockdata == NULL) { 672 TRAP_ERROR; 673 return (EINVAL); 674 } 675 if (sap->sg_len < 3 || sap->sg_data[sap->sg_len - 3] != '\0') { 676 TRAP_ERROR; 677 return (EINVAL); 678 } 679 return (ng_name_node(sockdata->node, sap->sg_data)); 680} 681 682/* 683 * Take a message and pass it up to the control socket associated 684 * with the node. 685 */ 686static int 687ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr) 688{ 689 struct socket *const so = pcbp->ng_socket; 690 struct mbuf *mdata; 691 int msglen; 692 693 /* Copy the message itself into an mbuf chain */ 694 msglen = sizeof(struct ng_mesg) + msg->header.arglen; 695 mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL); 696 697 /* Here we free the message, as we are the end of the line. 698 * We need to do that regardless of whether we got mbufs. */ 699 FREE(msg, M_NETGRAPH); 700 701 if (mdata == NULL) { 702 TRAP_ERROR; 703 return (ENOBUFS); 704 } 705 706 /* Send it up to the socket */ 707 if (sbappendaddr(&so->so_rcv, 708 (struct sockaddr *) addr, mdata, NULL) == 0) { 709 TRAP_ERROR; 710 m_freem(mdata); 711 return (ENOBUFS); 712 } 713 sorwakeup(so); 714 return (0); 715} 716 717/* 718 * You can only create new nodes from the socket end of things. 719 */ 720static int 721ngs_constructor(node_p *nodep) 722{ 723 return (EINVAL); 724} 725 726/* 727 * We allow any hook to be connected to the node. 728 * There is no per-hook private information though. 729 */ 730static int 731ngs_newhook(node_p node, hook_p hook, const char *name) 732{ 733 hook->private = node->private; 734 return (0); 735} 736 737/* 738 * Incoming messages get passed up to the control socket. 739 * Unless they are for us specifically (socket_type) 740 */ 741static int 742ngs_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, 743 struct ng_mesg **resp) 744{ 745 struct ngsock *const sockdata = node->private; 746 struct ngpcb *const pcbp = sockdata->ctlsock; 747 struct sockaddr_ng *addr; 748 int addrlen; 749 int error = 0; 750 751 /* Only allow mesgs to be passed if we have the control socket. 752 * Data sockets can only support the generic messages. */ 753 if (pcbp == NULL) { 754 TRAP_ERROR; 755 return (EINVAL); 756 } 757 758 if (msg->header.typecookie == NGM_SOCKET_COOKIE) { 759 switch (msg->header.cmd) { 760 case NGM_SOCK_CMD_NOLINGER: 761 sockdata->flags |= NGS_FLAG_NOLINGER; 762 break; 763 case NGM_SOCK_CMD_LINGER: 764 sockdata->flags &= ~NGS_FLAG_NOLINGER; 765 break; 766 default: 767 error = EINVAL; /* unknown command */ 768 } 769 /* Free the message and return */ 770 FREE(msg, M_NETGRAPH); 771 return(error); 772 773 } 774 /* Get the return address into a sockaddr */ 775 if ((retaddr == NULL) || (*retaddr == '\0')) 776 retaddr = ""; 777 addrlen = strlen(retaddr); 778 MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH, M_NOWAIT); 779 if (addr == NULL) { 780 TRAP_ERROR; 781 return (ENOMEM); 782 } 783 addr->sg_len = addrlen + 3; 784 addr->sg_family = AF_NETGRAPH; 785 bcopy(retaddr, addr->sg_data, addrlen); 786 addr->sg_data[addrlen] = '\0'; 787 788 /* Send it up */ 789 error = ship_msg(pcbp, msg, addr); 790 FREE(addr, M_NETGRAPH); 791 return (error); 792} 793 794/* 795 * Receive data on a hook 796 */ 797static int 798ngs_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 799{ 800 struct ngsock *const sockdata = hook->node->private; 801 struct ngpcb *const pcbp = sockdata->datasock; 802 struct socket *so; 803 struct sockaddr_ng *addr; 804 char *addrbuf[NG_HOOKLEN + 1 + 4]; 805 int addrlen; 806 807 /* If there is no data socket, black-hole it */ 808 if (pcbp == NULL) { 809 NG_FREE_DATA(m, meta); 810 return (0); 811 } 812 so = pcbp->ng_socket; 813 814 /* Get the return address into a sockaddr. */ 815 addrlen = strlen(hook->name); /* <= NG_HOOKLEN */ 816 addr = (struct sockaddr_ng *) addrbuf; 817 addr->sg_len = addrlen + 3; 818 addr->sg_family = AF_NETGRAPH; 819 bcopy(hook->name, addr->sg_data, addrlen); 820 addr->sg_data[addrlen] = '\0'; 821 822 /* We have no use for the meta data, free/clear it now. */ 823 NG_FREE_META(meta); 824 825 /* Try to tell the socket which hook it came in on */ 826 if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) { 827 m_freem(m); 828 TRAP_ERROR; 829 return (ENOBUFS); 830 } 831 sorwakeup(so); 832 return (0); 833} 834 835/* 836 * Hook disconnection 837 * 838 * For this type, removal of the last link destroys the node 839 * if the NOLINGER flag is set. 840 */ 841static int 842ngs_disconnect(hook_p hook) 843{ 844 struct ngsock *const sockdata = hook->node->private; 845 846 if ((sockdata->flags & NGS_FLAG_NOLINGER ) 847 && (hook->node->numhooks == 0)) { 848 ng_rmnode(hook->node); 849 } 850 return (0); 851} 852 853/* 854 * Do local shutdown processing. 855 * In this case, that involves making sure the socket 856 * knows we should be shutting down. 857 */ 858static int 859ngs_rmnode(node_p node) 860{ 861 struct ngsock *const sockdata = node->private; 862 struct ngpcb *const dpcbp = sockdata->datasock; 863 struct ngpcb *const pcbp = sockdata->ctlsock; 864 865 ng_cutlinks(node); 866 ng_unname(node); 867 868 if (dpcbp != NULL) { 869 soisdisconnected(dpcbp->ng_socket); 870 dpcbp->sockdata = NULL; 871 sockdata->datasock = NULL; 872 sockdata->refs--; 873 } 874 if (pcbp != NULL) { 875 soisdisconnected(pcbp->ng_socket); 876 pcbp->sockdata = NULL; 877 sockdata->ctlsock = NULL; 878 sockdata->refs--; 879 } 880 node->private = NULL; 881 ng_unref(node); 882 FREE(sockdata, M_NETGRAPH); 883 return (0); 884} 885 886/* 887 * Control and data socket type descriptors 888 */ 889 890static struct pr_usrreqs ngc_usrreqs = { 891 NULL, /* abort */ 892 pru_accept_notsupp, 893 ngc_attach, 894 ngc_bind, 895 ngc_connect, 896 pru_connect2_notsupp, 897 pru_control_notsupp, 898 ngc_detach, 899 NULL, /* disconnect */ 900 pru_listen_notsupp, 901 NULL, /* setpeeraddr */ 902 pru_rcvd_notsupp, 903 pru_rcvoob_notsupp, 904 ngc_send, 905 pru_sense_null, 906 NULL, /* shutdown */ 907 ng_setsockaddr, 908 sosend, 909 soreceive, 910 sopoll 911}; 912 913static struct pr_usrreqs ngd_usrreqs = { 914 NULL, /* abort */ 915 pru_accept_notsupp, 916 ngd_attach, 917 NULL, /* bind */ 918 ngd_connect, 919 pru_connect2_notsupp, 920 pru_control_notsupp, 921 ngd_detach, 922 NULL, /* disconnect */ 923 pru_listen_notsupp, 924 NULL, /* setpeeraddr */ 925 pru_rcvd_notsupp, 926 pru_rcvoob_notsupp, 927 ngd_send, 928 pru_sense_null, 929 NULL, /* shutdown */ 930 ng_setsockaddr, 931 sosend, 932 soreceive, 933 sopoll 934}; 935 936/* 937 * Definitions of protocols supported in the NETGRAPH domain. 938 */ 939 940extern struct domain ngdomain; /* stop compiler warnings */ 941 942static struct protosw ngsw[] = { 943 { 944 SOCK_DGRAM, 945 &ngdomain, 946 NG_CONTROL, 947 PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, 948 0, 0, 0, 0, 949 NULL, 950 0, 0, 0, 0, 951 &ngc_usrreqs 952 }, 953 { 954 SOCK_DGRAM, 955 &ngdomain, 956 NG_DATA, 957 PR_ATOMIC | PR_ADDR, 958 0, 0, 0, 0, 959 NULL, 960 0, 0, 0, 0, 961 &ngd_usrreqs 962 } 963}; 964 965struct domain ngdomain = { 966 AF_NETGRAPH, 967 "netgraph", 968 0, 969 NULL, 970 NULL, 971 ngsw, 972 &ngsw[sizeof(ngsw) / sizeof(ngsw[0])], 973 0, 974 NULL, 975 0, 976 0 977}; 978 979/* 980 * Handle loading and unloading for this node type 981 * This is to handle auxiliary linkages (e.g protocol domain addition). 982 */ 983static int 984ngs_mod_event(module_t mod, int event, void *data) 985{ 986 int error = 0; 987 988 switch (event) { 989 case MOD_LOAD: 990 /* Register protocol domain */ 991 net_add_domain(&ngdomain); 992 break; 993 case MOD_UNLOAD: 994 /* Insure there are no open netgraph sockets */ 995 if (!LIST_EMPTY(&ngsocklist)) { 996 error = EBUSY; 997 break; 998 } 999 1000#ifdef NOTYET 1001 /* Unregister protocol domain XXX can't do this yet.. */ 1002 if ((error = net_rm_domain(&ngdomain)) != 0) 1003 break; 1004#else 1005 error = EBUSY; 1006#endif 1007 break; 1008 default: 1009 error = EOPNOTSUPP; 1010 break; 1011 } 1012 return (error); 1013} 1014 1015SYSCTL_NODE(_net, AF_NETGRAPH, graph, CTLFLAG_RW, 0, "netgraph Family"); 1016SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, ""); 1017SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA"); 1018SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, ""); 1019SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL"); 1020SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, ""); 1021 1022