The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_socket.c

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    1 /*
    2  * ng_socket.c
    3  */
    4 
    5 /*-
    6  * Copyright (c) 1996-1999 Whistle Communications, Inc.
    7  * All rights reserved.
    8  *
    9  * Subject to the following obligations and disclaimer of warranty, use and
   10  * redistribution of this software, in source or object code forms, with or
   11  * without modifications are expressly permitted by Whistle Communications;
   12  * provided, however, that:
   13  * 1. Any and all reproductions of the source or object code must include the
   14  *    copyright notice above and the following disclaimer of warranties; and
   15  * 2. No rights are granted, in any manner or form, to use Whistle
   16  *    Communications, Inc. trademarks, including the mark "WHISTLE
   17  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   18  *    such appears in the above copyright notice or in the software.
   19  *
   20  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   21  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   22  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   23  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   24  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   25  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   26  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   27  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   28  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   29  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   30  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   31  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   32  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   35  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   36  * OF SUCH DAMAGE.
   37  *
   38  * Author: Julian Elischer <julian@freebsd.org>
   39  *
   40  * $FreeBSD: src/sys/netgraph/ng_socket.c,v 1.53.2.4 2005/11/03 11:44:24 glebius Exp $
   41  * $Whistle: ng_socket.c,v 1.28 1999/11/01 09:24:52 julian Exp $
   42  */
   43 
   44 /*
   45  * Netgraph socket nodes
   46  *
   47  * There are two types of netgraph sockets, control and data.
   48  * Control sockets have a netgraph node, but data sockets are
   49  * parasitic on control sockets, and have no node of their own.
   50  */
   51 
   52 #include <sys/param.h>
   53 #include <sys/domain.h>
   54 #include <sys/errno.h>
   55 #include <sys/kdb.h>
   56 #include <sys/kernel.h>
   57 #include <sys/linker.h>
   58 #include <sys/lock.h>
   59 #include <sys/malloc.h>
   60 #include <sys/mbuf.h>
   61 #include <sys/mutex.h>
   62 #include <sys/protosw.h>
   63 #include <sys/queue.h>
   64 #include <sys/signalvar.h>
   65 #include <sys/socket.h>
   66 #include <sys/socketvar.h>
   67 #include <sys/sx.h>
   68 #include <sys/sysctl.h>
   69 #include <sys/systm.h>
   70 #ifdef NOTYET
   71 #include <sys/vnode.h>
   72 #endif
   73 #include <netgraph/ng_message.h>
   74 #include <netgraph/netgraph.h>
   75 #include <netgraph/ng_socketvar.h>
   76 #include <netgraph/ng_socket.h>
   77 
   78 #ifdef NG_SEPARATE_MALLOC
   79 MALLOC_DEFINE(M_NETGRAPH_PATH, "netgraph_path", "netgraph path info ");
   80 MALLOC_DEFINE(M_NETGRAPH_SOCK, "netgraph_sock", "netgraph socket info ");
   81 #else
   82 #define M_NETGRAPH_PATH M_NETGRAPH
   83 #define M_NETGRAPH_SOCK M_NETGRAPH
   84 #endif
   85 
   86 /*
   87  * It's Ascii-art time!
   88  *   +-------------+   +-------------+
   89  *   |socket  (ctl)|   |socket (data)|
   90  *   +-------------+   +-------------+
   91  *          ^                 ^
   92  *          |                 |
   93  *          v                 v
   94  *    +-----------+     +-----------+
   95  *    |pcb   (ctl)|     |pcb  (data)|
   96  *    +-----------+     +-----------+
   97  *          ^                 ^
   98  *          |                 |
   99  *          v                 v
  100  *      +--------------------------+
  101  *      |   Socket type private    |
  102  *      |       data               |
  103  *      +--------------------------+
  104  *                   ^
  105  *                   |
  106  *                   v
  107  *           +----------------+
  108  *           | struct ng_node |
  109  *           +----------------+
  110  */
  111 
  112 /* Netgraph node methods */
  113 static ng_constructor_t ngs_constructor;
  114 static ng_rcvmsg_t      ngs_rcvmsg;
  115 static ng_shutdown_t    ngs_shutdown;
  116 static ng_newhook_t     ngs_newhook;
  117 static ng_connect_t     ngs_connect;
  118 static ng_rcvdata_t     ngs_rcvdata;
  119 static ng_disconnect_t  ngs_disconnect;
  120 
  121 /* Internal methods */
  122 static int      ng_attach_data(struct socket *so);
  123 static int      ng_attach_cntl(struct socket *so);
  124 static int      ng_attach_common(struct socket *so, int type);
  125 static void     ng_detach_common(struct ngpcb *pcbp, int type);
  126 /*static int    ng_internalize(struct mbuf *m, struct thread *p); */
  127 
  128 static int      ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp);
  129 static int      ng_bind(struct sockaddr *nam, struct ngpcb *pcbp);
  130 
  131 static int      ngs_mod_event(module_t mod, int event, void *data);
  132 static int      ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg,
  133                         struct sockaddr_ng *addr);
  134 
  135 /* Netgraph type descriptor */
  136 static struct ng_type typestruct = {
  137         .version =      NG_ABI_VERSION,
  138         .name =         NG_SOCKET_NODE_TYPE,
  139         .mod_event =    ngs_mod_event,
  140         .constructor =  ngs_constructor,
  141         .rcvmsg =       ngs_rcvmsg,
  142         .shutdown =     ngs_shutdown,
  143         .newhook =      ngs_newhook,
  144         .connect =      ngs_connect,
  145         .rcvdata =      ngs_rcvdata,
  146         .disconnect =   ngs_disconnect,
  147 };
  148 NETGRAPH_INIT(socket, &typestruct);
  149 
  150 /* Buffer space */
  151 static u_long ngpdg_sendspace = 20 * 1024;      /* really max datagram size */
  152 SYSCTL_INT(_net_graph, OID_AUTO, maxdgram, CTLFLAG_RW,
  153     &ngpdg_sendspace , 0, "Maximum outgoing Netgraph datagram size");
  154 static u_long ngpdg_recvspace = 20 * 1024;
  155 SYSCTL_INT(_net_graph, OID_AUTO, recvspace, CTLFLAG_RW,
  156     &ngpdg_recvspace , 0, "Maximum space for incoming Netgraph datagrams");
  157 
  158 /* List of all sockets */
  159 static LIST_HEAD(, ngpcb) ngsocklist;
  160 
  161 static struct mtx       ngsocketlist_mtx;
  162 MTX_SYSINIT(ngsocketlist, &ngsocketlist_mtx, "ng_socketlist", MTX_DEF);
  163 
  164 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb)
  165 
  166 /* If getting unexplained errors returned, set this to "kdb_enter("X"); */
  167 #ifndef TRAP_ERROR
  168 #define TRAP_ERROR
  169 #endif
  170 
  171 /***************************************************************
  172         Control sockets
  173 ***************************************************************/
  174 
  175 static int
  176 ngc_attach(struct socket *so, int proto, struct thread *td)
  177 {
  178         struct ngpcb *const pcbp = sotongpcb(so);
  179 
  180         if (suser(td))
  181                 return (EPERM);
  182         if (pcbp != NULL)
  183                 return (EISCONN);
  184         return (ng_attach_cntl(so));
  185 }
  186 
  187 static int
  188 ngc_detach(struct socket *so)
  189 {
  190         struct ngpcb *const pcbp = sotongpcb(so);
  191 
  192         if (pcbp == NULL)
  193                 return (EINVAL);
  194         ng_detach_common(pcbp, NG_CONTROL);
  195         return (0);
  196 }
  197 
  198 static int
  199 ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  200          struct mbuf *control, struct thread *td)
  201 {
  202         struct ngpcb *const pcbp = sotongpcb(so);
  203         struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
  204         struct ng_mesg *msg;
  205         struct mbuf *m0;
  206         item_p item;
  207         char *path = NULL;
  208         int len, error = 0;
  209 
  210         if (pcbp == NULL) {
  211                 error = EINVAL;
  212                 goto release;
  213         }
  214 #ifdef  NOTYET
  215         if (control && (error = ng_internalize(control, td))) {
  216                 if (pcbp->sockdata == NULL) {
  217                         error = ENOTCONN;
  218                         goto release;
  219                 }
  220         }
  221 #else   /* NOTYET */
  222         if (control) {
  223                 error = EINVAL;
  224                 goto release;
  225         }
  226 #endif  /* NOTYET */
  227 
  228         /* Require destination as there may be >= 1 hooks on this node */
  229         if (addr == NULL) {
  230                 error = EDESTADDRREQ;
  231                 goto release;
  232         }
  233 
  234         /* Allocate an expendable buffer for the path, chop off
  235          * the sockaddr header, and make sure it's NUL terminated */
  236         len = sap->sg_len - 2;
  237         MALLOC(path, char *, len + 1, M_NETGRAPH_PATH, M_WAITOK);
  238         if (path == NULL) {
  239                 error = ENOMEM;
  240                 goto release;
  241         }
  242         bcopy(sap->sg_data, path, len);
  243         path[len] = '\0';
  244 
  245         /* Move the actual message out of mbufs into a linear buffer.
  246          * Start by adding up the size of the data. (could use mh_len?) */
  247         for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next)
  248                 len += m0->m_len;
  249 
  250         /* Move the data into a linear buffer as well. Messages are not
  251          * delivered in mbufs. */
  252         MALLOC(msg, struct ng_mesg *, len + 1, M_NETGRAPH_MSG, M_WAITOK);
  253         if (msg == NULL) {
  254                 error = ENOMEM;
  255                 goto release;
  256         }
  257         m_copydata(m, 0, len, (char *)msg);
  258 
  259         if (msg->header.version != NG_VERSION &&
  260             msg->header.version != 0 ) {
  261                 error = EINVAL;
  262                 goto release;
  263         }
  264 
  265         /*
  266          * Hack alert!
  267          * We look into the message and if it mkpeers a node of unknown type, we
  268          * try to load it. We need to do this now, in syscall thread, because if
  269          * message gets queued and applied later we will get panic.
  270          */
  271         if (msg->header.typecookie == NGM_GENERIC_COOKIE &&
  272             msg->header.cmd == NGM_MKPEER) {
  273                 struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data;
  274                 struct ng_type *type;
  275 
  276                 if ((type = ng_findtype(mkp->type)) == NULL) {
  277                         char filename[NG_TYPESIZ + 3];
  278                         linker_file_t lf;
  279 
  280                         /* Not found, try to load it as a loadable module. */
  281                         snprintf(filename, sizeof(filename), "ng_%s",
  282                             mkp->type);
  283                         mtx_lock(&Giant);
  284                         error = linker_load_module(NULL, filename, NULL, NULL,
  285                             &lf);
  286                         mtx_unlock(&Giant);
  287                         if (error != 0) {
  288                                 FREE(msg, M_NETGRAPH_MSG);
  289                                 goto release;
  290                         }
  291                         lf->userrefs++;
  292 
  293                         /* See if type has been loaded successfully. */
  294                         if ((type = ng_findtype(mkp->type)) == NULL) {
  295                                 FREE(msg, M_NETGRAPH_MSG);
  296                                 error =  ENXIO;
  297                                 goto release;
  298                         }
  299                 }
  300         }
  301 
  302         if ((item = ng_package_msg(msg)) == NULL) {
  303                 error = ENOMEM;
  304 #ifdef TRACE_MESSAGES
  305                 printf("ng_package_msg: err=%d\n", error);
  306 #endif
  307                 goto release;
  308         }
  309         if ((error = ng_address_path((pcbp->sockdata->node), item,
  310             path, 0)) != 0) {
  311 #ifdef TRACE_MESSAGES
  312                 printf("ng_address_path: errx=%d\n", error);
  313 #endif
  314                 goto release;
  315         }
  316 
  317 #ifdef TRACE_MESSAGES
  318         printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n",
  319                 item->el_dest->nd_ID,
  320                 msg->header.typecookie,
  321                 msg->header.cmd,
  322                 msg->header.cmdstr,
  323                 msg->header.flags,
  324                 msg->header.token,
  325                 item->el_dest->nd_type->name);
  326 #endif
  327         SAVE_LINE(item);
  328         error = ng_snd_item(item, 0);
  329 
  330 release:
  331         if (path != NULL)
  332                 FREE(path, M_NETGRAPH_PATH);
  333         if (control != NULL)
  334                 m_freem(control);
  335         if (m != NULL)
  336                 m_freem(m);
  337         return (error);
  338 }
  339 
  340 static int
  341 ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  342 {
  343         struct ngpcb *const pcbp = sotongpcb(so);
  344 
  345         if (pcbp == 0)
  346                 return (EINVAL);
  347         return (ng_bind(nam, pcbp));
  348 }
  349 
  350 static int
  351 ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  352 {
  353 printf(" program tried to connect control socket to remote node\n ");
  354         /*
  355          * At this time refuse to do this.. it used to
  356          * do something but it was undocumented and not used.
  357          */
  358         return (EINVAL);
  359 }
  360 
  361 /***************************************************************
  362         Data sockets
  363 ***************************************************************/
  364 
  365 static int
  366 ngd_attach(struct socket *so, int proto, struct thread *td)
  367 {
  368         struct ngpcb *const pcbp = sotongpcb(so);
  369 
  370         if (pcbp != NULL)
  371                 return (EISCONN);
  372         return (ng_attach_data(so));
  373 }
  374 
  375 static int
  376 ngd_detach(struct socket *so)
  377 {
  378         struct ngpcb *const pcbp = sotongpcb(so);
  379 
  380         if (pcbp == NULL)
  381                 return (EINVAL);
  382         ng_detach_common(pcbp, NG_DATA);
  383         return (0);
  384 }
  385 
  386 static int
  387 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  388          struct mbuf *control, struct thread *td)
  389 {
  390         struct ngpcb *const pcbp = sotongpcb(so);
  391         struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
  392         int     len, error;
  393         hook_p  hook = NULL;
  394         char    hookname[NG_HOOKSIZ];
  395 
  396         if ((pcbp == NULL) || (control != NULL)) {
  397                 error = EINVAL;
  398                 goto release;
  399         }
  400         if (pcbp->sockdata == NULL) {
  401                 error = ENOTCONN;
  402                 goto release;
  403         }
  404         /*
  405          * If the user used any of these ways to not specify an address
  406          * then handle specially.
  407          */
  408         if ((sap == NULL)
  409             || ((len = sap->sg_len - 2) <= 0)
  410             || (*sap->sg_data == '\0')) {
  411                 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) {
  412                         error = EDESTADDRREQ;
  413                         goto release;
  414                 }
  415                 /*
  416                  * if exactly one hook exists, just use it.
  417                  * Special case to allow write(2) to work on an ng_socket.
  418                  */
  419                 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks);
  420         } else {
  421                 if (len >= NG_HOOKSIZ) {
  422                         error = EINVAL;
  423                         goto release;
  424                 }
  425 
  426                 /*
  427                  * chop off the sockaddr header, and make sure it's NUL
  428                  * terminated
  429                  */
  430                 bcopy(sap->sg_data, hookname, len);
  431                 hookname[len] = '\0';
  432 
  433                 /* Find the correct hook from 'hookname' */
  434                 LIST_FOREACH(hook, &pcbp->sockdata->node->nd_hooks, hk_hooks) {
  435                         if (strcmp(hookname, NG_HOOK_NAME(hook)) == 0) {
  436                                 break;
  437                         }
  438                 }
  439                 if (hook == NULL) {
  440                         error = EHOSTUNREACH;
  441                 }
  442         }
  443 
  444         /* Send data (OK if hook is NULL) */
  445         NG_SEND_DATA_ONLY(error, hook, m);      /* makes m NULL */
  446 
  447 release:
  448         if (control != NULL)
  449                 m_freem(control);
  450         if (m != NULL)
  451                 m_freem(m);
  452         return (error);
  453 }
  454 
  455 static int
  456 ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  457 {
  458         struct ngpcb *const pcbp = sotongpcb(so);
  459 
  460         if (pcbp == 0)
  461                 return (EINVAL);
  462         return (ng_connect_data(nam, pcbp));
  463 }
  464 
  465 /*
  466  * Used for both data and control sockets
  467  */
  468 static int
  469 ng_setsockaddr(struct socket *so, struct sockaddr **addr)
  470 {
  471         struct ngpcb *pcbp;
  472         struct sockaddr_ng *sg;
  473         int sg_len, namelen, s;
  474 
  475         /* Why isn't sg_data a `char[1]' ? :-( */
  476         sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1;
  477 
  478         s = splnet();
  479         pcbp = sotongpcb(so);
  480         if ((pcbp == NULL) || (pcbp->sockdata == NULL)) {
  481                 splx(s);
  482                 return (EINVAL);
  483         }
  484 
  485         namelen = 0;            /* silence compiler ! */
  486         if ( NG_NODE_HAS_NAME(pcbp->sockdata->node))
  487                 sg_len += namelen = strlen(NG_NODE_NAME(pcbp->sockdata->node));
  488 
  489         MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK | M_ZERO);
  490 
  491         if (NG_NODE_HAS_NAME(pcbp->sockdata->node))
  492                 bcopy(NG_NODE_NAME(pcbp->sockdata->node), sg->sg_data, namelen);
  493         splx(s);
  494 
  495         sg->sg_len = sg_len;
  496         sg->sg_family = AF_NETGRAPH;
  497         *addr = (struct sockaddr *)sg;
  498 
  499         return (0);
  500 }
  501 
  502 /*
  503  * Attach a socket to it's protocol specific partner.
  504  * For a control socket, actually create a netgraph node and attach
  505  * to it as well.
  506  */
  507 
  508 static int
  509 ng_attach_cntl(struct socket *so)
  510 {
  511         struct ngsock *privdata;
  512         struct ngpcb *pcbp;
  513         int error;
  514 
  515         /* Setup protocol control block */
  516         if ((error = ng_attach_common(so, NG_CONTROL)) != 0)
  517                 return (error);
  518         pcbp = sotongpcb(so);
  519 
  520         /* Allocate node private info */
  521         MALLOC(privdata, struct ngsock *,
  522             sizeof(*privdata), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO);
  523         if (privdata == NULL) {
  524                 ng_detach_common(pcbp, NG_CONTROL);
  525                 return (ENOMEM);
  526         }
  527 
  528         /* Make the generic node components */
  529         if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) {
  530                 FREE(privdata, M_NETGRAPH_SOCK);
  531                 ng_detach_common(pcbp, NG_CONTROL);
  532                 return (error);
  533         }
  534         NG_NODE_SET_PRIVATE(privdata->node, privdata);
  535 
  536         /* Link the pcb and the node private data */
  537         privdata->ctlsock = pcbp;
  538         pcbp->sockdata = privdata;
  539         privdata->refs++;
  540         return (0);
  541 }
  542 
  543 static int
  544 ng_attach_data(struct socket *so)
  545 {
  546         return(ng_attach_common(so, NG_DATA));
  547 }
  548 
  549 /*
  550  * Set up a socket protocol control block.
  551  * This code is shared between control and data sockets.
  552  */
  553 static int
  554 ng_attach_common(struct socket *so, int type)
  555 {
  556         struct ngpcb *pcbp;
  557         int error;
  558 
  559         /* Standard socket setup stuff */
  560         error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace);
  561         if (error)
  562                 return (error);
  563 
  564         /* Allocate the pcb */
  565         MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO);
  566         if (pcbp == NULL)
  567                 return (ENOMEM);
  568         pcbp->type = type;
  569 
  570         /* Link the pcb and the socket */
  571         so->so_pcb = (caddr_t) pcbp;
  572         pcbp->ng_socket = so;
  573 
  574         /* Add the socket to linked list */
  575         mtx_lock(&ngsocketlist_mtx);
  576         LIST_INSERT_HEAD(&ngsocklist, pcbp, socks);
  577         mtx_unlock(&ngsocketlist_mtx);
  578         return (0);
  579 }
  580 
  581 /*
  582  * Disassociate the socket from it's protocol specific
  583  * partner. If it's attached to a node's private data structure,
  584  * then unlink from that too. If we were the last socket attached to it,
  585  * then shut down the entire node. Shared code for control and data sockets.
  586  */
  587 static void
  588 ng_detach_common(struct ngpcb *pcbp, int which)
  589 {
  590         struct ngsock *priv;
  591 
  592         if (pcbp->sockdata) {
  593                 priv = pcbp->sockdata;
  594                 pcbp->sockdata = NULL;
  595                 switch (which) {
  596                 case NG_CONTROL:
  597                         priv->ctlsock = NULL;
  598                         break;
  599                 case NG_DATA:
  600                         priv->datasock = NULL;
  601                         break;
  602                 default:
  603                         panic(__func__);
  604                 }
  605                 if ((--priv->refs == 0) && (priv->node != NULL))
  606                         ng_rmnode_self(priv->node);
  607         }
  608         pcbp->ng_socket->so_pcb = NULL;
  609         pcbp->ng_socket = NULL;
  610         mtx_lock(&ngsocketlist_mtx);
  611         LIST_REMOVE(pcbp, socks);
  612         mtx_unlock(&ngsocketlist_mtx);
  613         FREE(pcbp, M_PCB);
  614 }
  615 
  616 #ifdef NOTYET
  617 /*
  618  * File descriptors can be passed into an AF_NETGRAPH socket.
  619  * Note, that file descriptors cannot be passed OUT.
  620  * Only character device descriptors are accepted.
  621  * Character devices are useful to connect a graph to a device,
  622  * which after all is the purpose of this whole system.
  623  */
  624 static int
  625 ng_internalize(struct mbuf *control, struct thread *td)
  626 {
  627         const struct cmsghdr *cm = mtod(control, const struct cmsghdr *);
  628         struct file *fp;
  629         struct vnode *vn;
  630         int oldfds;
  631         int fd;
  632 
  633         if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET ||
  634             cm->cmsg_len != control->m_len) {
  635                 TRAP_ERROR;
  636                 return (EINVAL);
  637         }
  638 
  639         /* Check there is only one FD. XXX what would more than one signify? */
  640         oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int);
  641         if (oldfds != 1) {
  642                 TRAP_ERROR;
  643                 return (EINVAL);
  644         }
  645 
  646         /* Check that the FD given is legit. and change it to a pointer to a
  647          * struct file. */
  648         fd = CMSG_DATA(cm);
  649         if ((error = fget(td, fd, &fp)) != 0)
  650                 return (error);
  651 
  652         /* Depending on what kind of resource it is, act differently. For
  653          * devices, we treat it as a file. For an AF_NETGRAPH socket,
  654          * shortcut straight to the node. */
  655         switch (fp->f_type) {
  656         case DTYPE_VNODE:
  657                 vn = fp->f_data;
  658                 if (vn && (vn->v_type == VCHR)) {
  659                         /* for a VCHR, actually reference the FILE */
  660                         fp->f_count++;
  661                         /* XXX then what :) */
  662                         /* how to pass on to other modules? */
  663                 } else {
  664                         fdrop(fp, td);
  665                         TRAP_ERROR;
  666                         return (EINVAL);
  667                 }
  668                 break;
  669         default:
  670                 fdrop(fp, td);
  671                 TRAP_ERROR;
  672                 return (EINVAL);
  673         }
  674         fdrop(fp, td);
  675         return (0);
  676 }
  677 #endif  /* NOTYET */
  678 
  679 /*
  680  * Connect the data socket to a named control socket node.
  681  */
  682 static int
  683 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp)
  684 {
  685         struct sockaddr_ng *sap;
  686         node_p farnode;
  687         struct ngsock *priv;
  688         int error;
  689         item_p item;
  690 
  691         /* If we are already connected, don't do it again */
  692         if (pcbp->sockdata != NULL)
  693                 return (EISCONN);
  694 
  695         /* Find the target (victim) and check it doesn't already have a data
  696          * socket. Also check it is a 'socket' type node.
  697          * Use ng_package_data() and address_path() to do this.
  698          */
  699 
  700         sap = (struct sockaddr_ng *) nam;
  701         /* The item will hold the node reference */
  702         item = ng_package_data(NULL, NULL);
  703         if (item == NULL) {
  704                 return (ENOMEM);
  705         }
  706         if ((error = ng_address_path(NULL, item,  sap->sg_data, 0)))
  707                 return (error); /* item is freed on failure */
  708 
  709         /*
  710          * Extract node from item and free item. Remember we now have
  711          * a reference on the node. The item holds it for us.
  712          * when we free the item we release the reference.
  713          */
  714         farnode = item->el_dest; /* shortcut */
  715         if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) {
  716                 NG_FREE_ITEM(item); /* drop the reference to the node */
  717                 return (EINVAL);
  718         }
  719         priv = NG_NODE_PRIVATE(farnode);
  720         if (priv->datasock != NULL) {
  721                 NG_FREE_ITEM(item);     /* drop the reference to the node */
  722                 return (EADDRINUSE);
  723         }
  724 
  725         /*
  726          * Link the PCB and the private data struct. and note the extra
  727          * reference. Drop the extra reference on the node.
  728          */
  729         priv->datasock = pcbp;
  730         pcbp->sockdata = priv;
  731         priv->refs++; /* XXX possible race if it's being freed */
  732         NG_FREE_ITEM(item);     /* drop the reference to the node */
  733         return (0);
  734 }
  735 
  736 /*
  737  * Binding a socket means giving the corresponding node a name
  738  */
  739 static int
  740 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp)
  741 {
  742         struct ngsock *const priv = pcbp->sockdata;
  743         struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam;
  744 
  745         if (priv == NULL) {
  746                 TRAP_ERROR;
  747                 return (EINVAL);
  748         }
  749         if ((sap->sg_len < 4)
  750         ||  (sap->sg_len > (NG_NODESIZ + 2))
  751         ||  (sap->sg_data[0] == '\0')
  752         ||  (sap->sg_data[sap->sg_len - 3] != '\0')) {
  753                 TRAP_ERROR;
  754                 return (EINVAL);
  755         }
  756         return (ng_name_node(priv->node, sap->sg_data));
  757 }
  758 
  759 /*
  760  * Take a message and pass it up to the control socket associated
  761  * with the node.
  762  */
  763 static int
  764 ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr)
  765 {
  766         struct socket *const so = pcbp->ng_socket;
  767         struct mbuf *mdata;
  768         int msglen;
  769         int error = 0;
  770 
  771         /* Copy the message itself into an mbuf chain */
  772         msglen = sizeof(struct ng_mesg) + msg->header.arglen;
  773         mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL);
  774 
  775         /* Here we free the message, as we are the end of the line.
  776          * We need to do that regardless of whether we got mbufs. */
  777         NG_FREE_MSG(msg);
  778 
  779         if (mdata == NULL) {
  780                 TRAP_ERROR;
  781                 return (ENOBUFS);
  782         }
  783 
  784         /* Send it up to the socket */
  785         if (sbappendaddr(&so->so_rcv,
  786             (struct sockaddr *) addr, mdata, NULL) == 0) {
  787                 TRAP_ERROR;
  788                 m_freem(mdata);
  789                 error = so->so_error = ENOBUFS;
  790         }
  791         sorwakeup(so);
  792         return (error);
  793 }
  794 
  795 /*
  796  * You can only create new nodes from the socket end of things.
  797  */
  798 static int
  799 ngs_constructor(node_p nodep)
  800 {
  801         return (EINVAL);
  802 }
  803 
  804 /*
  805  * We allow any hook to be connected to the node.
  806  * There is no per-hook private information though.
  807  */
  808 static int
  809 ngs_newhook(node_p node, hook_p hook, const char *name)
  810 {
  811         NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node));
  812         return (0);
  813 }
  814 
  815 /* 
  816  * if only one hook, allow read(2) and write(2) to work.
  817  */
  818 static int
  819 ngs_connect(hook_p hook)
  820 {
  821         node_p node = NG_HOOK_NODE(hook);
  822         struct ngsock *priv = NG_NODE_PRIVATE(node);
  823 
  824         if ((priv->datasock)
  825         &&  (priv->datasock->ng_socket)) {
  826                 if (NG_NODE_NUMHOOKS(node) == 1) {
  827                         priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
  828                 } else {
  829                         priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
  830                 }
  831         }
  832         return (0);
  833 }
  834 
  835 /*
  836  * Incoming messages get passed up to the control socket.
  837  * Unless they are for us specifically (socket_type)
  838  */
  839 static int
  840 ngs_rcvmsg(node_p node, item_p item, hook_p lasthook)
  841 {
  842         struct ngsock *const priv = NG_NODE_PRIVATE(node);
  843         struct ngpcb *const pcbp = priv->ctlsock;
  844         struct sockaddr_ng *addr;
  845         int addrlen;
  846         int error = 0;
  847         struct  ng_mesg *msg;
  848         ng_ID_t retaddr = NGI_RETADDR(item);
  849         char    retabuf[32];
  850 
  851         NGI_GET_MSG(item, msg);
  852         NG_FREE_ITEM(item); /* we have all we need */
  853 
  854         /* Only allow mesgs to be passed if we have the control socket.
  855          * Data sockets can only support the generic messages. */
  856         if (pcbp == NULL) {
  857                 TRAP_ERROR;
  858                 return (EINVAL);
  859         }
  860 
  861 #ifdef TRACE_MESSAGES
  862         printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n",
  863                 retaddr,
  864                 msg->header.typecookie,
  865                 msg->header.cmd,
  866                 msg->header.cmdstr,
  867                 msg->header.flags,
  868                 msg->header.token);
  869 #endif
  870 
  871         if (msg->header.typecookie == NGM_SOCKET_COOKIE) {
  872                 switch (msg->header.cmd) {
  873                 case NGM_SOCK_CMD_NOLINGER:
  874                         priv->flags |= NGS_FLAG_NOLINGER;
  875                         break;
  876                 case NGM_SOCK_CMD_LINGER:
  877                         priv->flags &= ~NGS_FLAG_NOLINGER;
  878                         break;
  879                 default:
  880                         error = EINVAL;         /* unknown command */
  881                 }
  882                 /* Free the message and return */
  883                 NG_FREE_MSG(msg);
  884                 return(error);
  885 
  886         }
  887         /* Get the return address into a sockaddr */
  888         sprintf(retabuf,"[%x]:", retaddr);
  889         addrlen = strlen(retabuf);
  890         MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH_PATH, M_NOWAIT);
  891         if (addr == NULL) {
  892                 TRAP_ERROR;
  893                 return (ENOMEM);
  894         }
  895         addr->sg_len = addrlen + 3;
  896         addr->sg_family = AF_NETGRAPH;
  897         bcopy(retabuf, addr->sg_data, addrlen);
  898         addr->sg_data[addrlen] = '\0';
  899 
  900         /* Send it up */
  901         error = ship_msg(pcbp, msg, addr);
  902         FREE(addr, M_NETGRAPH_PATH);
  903         return (error);
  904 }
  905 
  906 /*
  907  * Receive data on a hook
  908  */
  909 static int
  910 ngs_rcvdata(hook_p hook, item_p item)
  911 {
  912         struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  913         struct ngpcb *const pcbp = priv->datasock;
  914         struct socket *so;
  915         struct sockaddr_ng *addr;
  916         char *addrbuf[NG_HOOKSIZ + 4];
  917         int addrlen;
  918         struct mbuf *m;
  919 
  920         NGI_GET_M(item, m);
  921         NG_FREE_ITEM(item);
  922         /* If there is no data socket, black-hole it */
  923         if (pcbp == NULL) {
  924                 NG_FREE_M(m);
  925                 return (0);
  926         }
  927         so = pcbp->ng_socket;
  928 
  929         /* Get the return address into a sockaddr. */
  930         addrlen = strlen(NG_HOOK_NAME(hook));   /* <= NG_HOOKSIZ - 1 */
  931         addr = (struct sockaddr_ng *) addrbuf;
  932         addr->sg_len = addrlen + 3;
  933         addr->sg_family = AF_NETGRAPH;
  934         bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen);
  935         addr->sg_data[addrlen] = '\0';
  936 
  937         /* Try to tell the socket which hook it came in on */
  938         if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) {
  939                 m_freem(m);
  940                 TRAP_ERROR;
  941                 return (ENOBUFS);
  942         }
  943         sorwakeup(so);
  944         return (0);
  945 }
  946 
  947 /*
  948  * Hook disconnection
  949  *
  950  * For this type, removal of the last link destroys the node
  951  * if the NOLINGER flag is set.
  952  */
  953 static int
  954 ngs_disconnect(hook_p hook)
  955 {
  956         node_p node = NG_HOOK_NODE(hook);
  957         struct ngsock *const priv = NG_NODE_PRIVATE(node);
  958 
  959         if ((priv->datasock)
  960         &&  (priv->datasock->ng_socket)) {
  961                 if (NG_NODE_NUMHOOKS(node) == 1) {
  962                         priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
  963                 } else {
  964                         priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
  965                 }
  966         }
  967 
  968         if ((priv->flags & NGS_FLAG_NOLINGER )
  969         && (NG_NODE_NUMHOOKS(node) == 0)
  970         && (NG_NODE_IS_VALID(node))) {
  971                 ng_rmnode_self(node);
  972         }
  973         return (0);
  974 }
  975 
  976 /*
  977  * Do local shutdown processing.
  978  * In this case, that involves making sure the socket
  979  * knows we should be shutting down.
  980  */
  981 static int
  982 ngs_shutdown(node_p node)
  983 {
  984         struct ngsock *const priv = NG_NODE_PRIVATE(node);
  985         struct ngpcb *const dpcbp = priv->datasock;
  986         struct ngpcb *const pcbp = priv->ctlsock;
  987 
  988         if (dpcbp != NULL) {
  989                 soisdisconnected(dpcbp->ng_socket);
  990                 dpcbp->sockdata = NULL;
  991                 priv->datasock = NULL;
  992                 priv->refs--;
  993         }
  994         if (pcbp != NULL) {
  995                 soisdisconnected(pcbp->ng_socket);
  996                 pcbp->sockdata = NULL;
  997                 priv->ctlsock = NULL;
  998                 priv->refs--;
  999         }
 1000         NG_NODE_SET_PRIVATE(node, NULL);
 1001         NG_NODE_UNREF(node);
 1002         FREE(priv, M_NETGRAPH_SOCK);
 1003         return (0);
 1004 }
 1005 
 1006 static  int
 1007 dummy_disconnect(struct socket *so)
 1008 {
 1009         return (0);
 1010 }
 1011 /*
 1012  * Control and data socket type descriptors
 1013  */
 1014 
 1015 static struct pr_usrreqs ngc_usrreqs = {
 1016         NULL,                   /* abort */
 1017         pru_accept_notsupp,
 1018         ngc_attach,
 1019         ngc_bind,
 1020         ngc_connect,
 1021         pru_connect2_notsupp,
 1022         pru_control_notsupp,
 1023         ngc_detach,
 1024         dummy_disconnect,       /* disconnect */
 1025         pru_listen_notsupp,
 1026         NULL,                   /* setpeeraddr */
 1027         pru_rcvd_notsupp,
 1028         pru_rcvoob_notsupp,
 1029         ngc_send,
 1030         pru_sense_null,
 1031         NULL,                   /* shutdown */
 1032         ng_setsockaddr,
 1033         sosend,
 1034         soreceive,
 1035         sopoll,
 1036         pru_sosetlabel_null
 1037 };
 1038 
 1039 static struct pr_usrreqs ngd_usrreqs = {
 1040         NULL,                   /* abort */
 1041         pru_accept_notsupp,
 1042         ngd_attach,
 1043         NULL,                   /* bind */
 1044         ngd_connect,
 1045         pru_connect2_notsupp,
 1046         pru_control_notsupp,
 1047         ngd_detach,
 1048         dummy_disconnect,       /* disconnect */
 1049         pru_listen_notsupp,
 1050         NULL,                   /* setpeeraddr */
 1051         pru_rcvd_notsupp,
 1052         pru_rcvoob_notsupp,
 1053         ngd_send,
 1054         pru_sense_null,
 1055         NULL,                   /* shutdown */
 1056         ng_setsockaddr,
 1057         sosend,
 1058         soreceive,
 1059         sopoll,
 1060         pru_sosetlabel_null
 1061 };
 1062 
 1063 /*
 1064  * Definitions of protocols supported in the NETGRAPH domain.
 1065  */
 1066 
 1067 extern struct domain ngdomain;          /* stop compiler warnings */
 1068 
 1069 static struct protosw ngsw[] = {
 1070         {
 1071                 SOCK_DGRAM,             /* protocol type */
 1072                 &ngdomain,              /* backpointer to domain */
 1073                 NG_CONTROL,
 1074                 PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */,  /* flags */
 1075                 0, 0, 0, 0,             /* input, output, ctlinput, ctloutput */
 1076                 NULL,                   /* ousrreq */
 1077                 0, 0, 0, 0,             /* init, fasttimeo, slowtimo, drain */
 1078                 &ngc_usrreqs,           /* usrreq table (above) */
 1079                 /*{NULL}*/              /* pffh (protocol filter head?) */
 1080         },
 1081         {
 1082                 SOCK_DGRAM,             /* protocol type */
 1083                 &ngdomain,              /* backpointer to domain */
 1084                 NG_DATA,
 1085                 PR_ATOMIC | PR_ADDR,    /* flags */
 1086                 0, 0, 0, 0,             /* input, output, ctlinput, ctloutput */
 1087                 NULL,                   /* ousrreq() */
 1088                 0, 0, 0, 0,             /* init, fasttimeo, slowtimo, drain */
 1089                 &ngd_usrreqs,           /* usrreq table (above) */
 1090                 /*{NULL}*/              /* pffh (protocol filter head?) */
 1091         }
 1092 };
 1093 
 1094 struct domain ngdomain = {
 1095         AF_NETGRAPH,
 1096         "netgraph",
 1097         NULL,                                   /* init() */
 1098         NULL,                                   /* externalise() */
 1099         NULL,                                   /* dispose() */
 1100         ngsw,                                   /* protosw entry */
 1101         &ngsw[sizeof(ngsw) / sizeof(ngsw[0])],  /* Number of protosw entries */
 1102         NULL,                                   /* next domain in list */
 1103         NULL,                                   /* rtattach() */
 1104         0,                                      /* arg to rtattach in bits */
 1105         0                                       /* maxrtkey */
 1106 };
 1107 
 1108 /*
 1109  * Handle loading and unloading for this node type
 1110  * This is to handle auxiliary linkages (e.g protocol domain addition).
 1111  */
 1112 static int
 1113 ngs_mod_event(module_t mod, int event, void *data)
 1114 {
 1115         int error = 0;
 1116 
 1117         switch (event) {
 1118         case MOD_LOAD:
 1119                 /* Register protocol domain */
 1120                 net_add_domain(&ngdomain);
 1121                 break;
 1122         case MOD_UNLOAD:
 1123                 /* Insure there are no open netgraph sockets */
 1124                 if (!LIST_EMPTY(&ngsocklist)) {
 1125                         error = EBUSY;
 1126                         break;
 1127                 }
 1128 
 1129 #ifdef NOTYET
 1130                 if ((LIST_EMPTY(&ngsocklist)) && (typestruct.refs == 0)) {
 1131                 /* Unregister protocol domain XXX can't do this yet.. */
 1132                         if ((error = net_rm_domain(&ngdomain)) != 0)
 1133                                 break;
 1134                 } else
 1135 #endif
 1136                         error = EBUSY;
 1137                 break;
 1138         default:
 1139                 error = EOPNOTSUPP;
 1140                 break;
 1141         }
 1142         return (error);
 1143 }
 1144 
 1145 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, "");
 1146 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA");
 1147 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, "");
 1148 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL");
 1149 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, "");
 1150 

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