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: releng/5.4/sys/netgraph/ng_socket.c 141475 2005-02-07 19:50:34Z glebius $
   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         char *path = NULL;
  207         int len, error = 0;
  208 
  209         if (pcbp == NULL) {
  210                 error = EINVAL;
  211                 goto release;
  212         }
  213 #ifdef  NOTYET
  214         if (control && (error = ng_internalize(control, td))) {
  215                 if (pcbp->sockdata == NULL) {
  216                         error = ENOTCONN;
  217                         goto release;
  218                 }
  219         }
  220 #else   /* NOTYET */
  221         if (control) {
  222                 error = EINVAL;
  223                 goto release;
  224         }
  225 #endif  /* NOTYET */
  226 
  227         /* Require destination as there may be >= 1 hooks on this node */
  228         if (addr == NULL) {
  229                 error = EDESTADDRREQ;
  230                 goto release;
  231         }
  232 
  233         /* Allocate an expendable buffer for the path, chop off
  234          * the sockaddr header, and make sure it's NUL terminated */
  235         len = sap->sg_len - 2;
  236         MALLOC(path, char *, len + 1, M_NETGRAPH_PATH, M_WAITOK);
  237         if (path == NULL) {
  238                 error = ENOMEM;
  239                 goto release;
  240         }
  241         bcopy(sap->sg_data, path, len);
  242         path[len] = '\0';
  243 
  244         /* Move the actual message out of mbufs into a linear buffer.
  245          * Start by adding up the size of the data. (could use mh_len?) */
  246         for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next)
  247                 len += m0->m_len;
  248 
  249         /* Move the data into a linear buffer as well. Messages are not
  250          * delivered in mbufs. */
  251         MALLOC(msg, struct ng_mesg *, len + 1, M_NETGRAPH_MSG, M_WAITOK);
  252         if (msg == NULL) {
  253                 error = ENOMEM;
  254                 goto release;
  255         }
  256         m_copydata(m, 0, len, (char *)msg);
  257 
  258         if (msg->header.version != NG_VERSION &&
  259             msg->header.version != 0 ) {
  260                 error = EINVAL;
  261                 goto release;
  262         }
  263 
  264 #ifdef TRACE_MESSAGES
  265         do {                                                            
  266                 item_p item;                                            
  267                 if ((item = ng_package_msg(msg)) == NULL) {             
  268                         (msg) = NULL;                           
  269                         (error) = ENOMEM;                               
  270 printf("err=%d\n",error);
  271                         break;                                          
  272                 }                                                       
  273                 if (((error) = ng_address_path((pcbp->sockdata->node), (item),          
  274                                         (path), (NULL))) == 0) {        
  275 printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n",
  276 item->el_dest->nd_ID,
  277 msg->header.typecookie,
  278 msg->header.cmd,
  279 msg->header.cmdstr,
  280 msg->header.flags,
  281 msg->header.token,
  282 item->el_dest->nd_type->name); 
  283                         SAVE_LINE(item);                        
  284                         (error) = ng_snd_item((item), 0);               
  285                 }                                                       
  286 else {
  287 printf("errx=%d\n",error);
  288 }
  289                 (msg) = NULL;                                           
  290         } while (0);
  291 
  292 #else
  293         /*
  294          * Hack alert!
  295          * We look into the message and if it mkpeers a node of unknown type, we
  296          * try to load it. We need to do this now, in syscall thread, because if
  297          * message gets queued and applied later we will get panic.
  298          */
  299         if (msg->header.typecookie == NGM_GENERIC_COOKIE &&
  300             msg->header.cmd == NGM_MKPEER) {
  301                 struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data;
  302                 struct ng_type *type;
  303 
  304                 if ((type = ng_findtype(mkp->type)) == NULL) {
  305                         char filename[NG_TYPESIZ + 3];
  306                         linker_file_t lf;
  307                         int error;
  308 
  309                         /* Not found, try to load it as a loadable module */
  310                         snprintf(filename, sizeof(filename), "ng_%s", mkp->type);
  311                         mtx_lock(&Giant);
  312                         error = linker_load_module(NULL, filename, NULL, NULL, &lf);
  313                         mtx_unlock(&Giant);
  314                         if (error != 0) {
  315                                 FREE(msg, M_NETGRAPH_MSG);
  316                                 goto release;
  317                         }
  318                         lf->userrefs++;
  319 
  320                         /* Try again, as now the type should have linked itself in */
  321                         if ((type = ng_findtype(mkp->type)) == NULL) {
  322                                 FREE(msg, M_NETGRAPH_MSG);
  323                                 error =  ENXIO;
  324                                 goto release;
  325                         }
  326                 }
  327         }
  328 
  329         /* The callee will free the msg when done. The path is our business. */
  330         NG_SEND_MSG_PATH(error, pcbp->sockdata->node, msg, path, 0);
  331 #endif
  332 release:
  333         if (path != NULL)
  334                 FREE(path, M_NETGRAPH_PATH);
  335         if (control != NULL)
  336                 m_freem(control);
  337         if (m != NULL)
  338                 m_freem(m);
  339         return (error);
  340 }
  341 
  342 static int
  343 ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  344 {
  345         struct ngpcb *const pcbp = sotongpcb(so);
  346 
  347         if (pcbp == 0)
  348                 return (EINVAL);
  349         return (ng_bind(nam, pcbp));
  350 }
  351 
  352 static int
  353 ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  354 {
  355 printf(" program tried to connect control socket to remote node\n ");
  356         /*
  357          * At this time refuse to do this.. it used to
  358          * do something but it was undocumented and not used.
  359          */
  360         return (EINVAL);
  361 }
  362 
  363 /***************************************************************
  364         Data sockets
  365 ***************************************************************/
  366 
  367 static int
  368 ngd_attach(struct socket *so, int proto, struct thread *td)
  369 {
  370         struct ngpcb *const pcbp = sotongpcb(so);
  371 
  372         if (pcbp != NULL)
  373                 return (EISCONN);
  374         return (ng_attach_data(so));
  375 }
  376 
  377 static int
  378 ngd_detach(struct socket *so)
  379 {
  380         struct ngpcb *const pcbp = sotongpcb(so);
  381 
  382         if (pcbp == NULL)
  383                 return (EINVAL);
  384         ng_detach_common(pcbp, NG_DATA);
  385         return (0);
  386 }
  387 
  388 static int
  389 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  390          struct mbuf *control, struct thread *td)
  391 {
  392         struct ngpcb *const pcbp = sotongpcb(so);
  393         struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
  394         int     len, error;
  395         hook_p  hook = NULL;
  396         char    hookname[NG_HOOKSIZ];
  397 
  398         if ((pcbp == NULL) || (control != NULL)) {
  399                 error = EINVAL;
  400                 goto release;
  401         }
  402         if (pcbp->sockdata == NULL) {
  403                 error = ENOTCONN;
  404                 goto release;
  405         }
  406         /*
  407          * If the user used any of these ways to not specify an address
  408          * then handle specially.
  409          */
  410         if ((sap == NULL)
  411             || ((len = sap->sg_len - 2) <= 0)
  412             || (*sap->sg_data == '\0')) {
  413                 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) {
  414                         error = EDESTADDRREQ;
  415                         goto release;
  416                 }
  417                 /*
  418                  * if exactly one hook exists, just use it.
  419                  * Special case to allow write(2) to work on an ng_socket.
  420                  */
  421                 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks);
  422         } else {
  423                 if (len >= NG_HOOKSIZ) {
  424                         error = EINVAL;
  425                         goto release;
  426                 }
  427 
  428                 /*
  429                  * chop off the sockaddr header, and make sure it's NUL
  430                  * terminated
  431                  */
  432                 bcopy(sap->sg_data, hookname, len);
  433                 hookname[len] = '\0';
  434 
  435                 /* Find the correct hook from 'hookname' */
  436                 LIST_FOREACH(hook, &pcbp->sockdata->node->nd_hooks, hk_hooks) {
  437                         if (strcmp(hookname, NG_HOOK_NAME(hook)) == 0) {
  438                                 break;
  439                         }
  440                 }
  441                 if (hook == NULL) {
  442                         error = EHOSTUNREACH;
  443                 }
  444         }
  445 
  446         /* Send data (OK if hook is NULL) */
  447         NG_SEND_DATA_ONLY(error, hook, m);      /* makes m NULL */
  448 
  449 release:
  450         if (control != NULL)
  451                 m_freem(control);
  452         if (m != NULL)
  453                 m_freem(m);
  454         return (error);
  455 }
  456 
  457 static int
  458 ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  459 {
  460         struct ngpcb *const pcbp = sotongpcb(so);
  461 
  462         if (pcbp == 0)
  463                 return (EINVAL);
  464         return (ng_connect_data(nam, pcbp));
  465 }
  466 
  467 /*
  468  * Used for both data and control sockets
  469  */
  470 static int
  471 ng_setsockaddr(struct socket *so, struct sockaddr **addr)
  472 {
  473         struct ngpcb *pcbp;
  474         struct sockaddr_ng *sg;
  475         int sg_len, namelen, s;
  476 
  477         /* Why isn't sg_data a `char[1]' ? :-( */
  478         sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1;
  479 
  480         s = splnet();
  481         pcbp = sotongpcb(so);
  482         if ((pcbp == NULL) || (pcbp->sockdata == NULL)) {
  483                 splx(s);
  484                 return (EINVAL);
  485         }
  486 
  487         namelen = 0;            /* silence compiler ! */
  488         if ( NG_NODE_HAS_NAME(pcbp->sockdata->node))
  489                 sg_len += namelen = strlen(NG_NODE_NAME(pcbp->sockdata->node));
  490 
  491         MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK | M_ZERO);
  492 
  493         if (NG_NODE_HAS_NAME(pcbp->sockdata->node))
  494                 bcopy(NG_NODE_NAME(pcbp->sockdata->node), sg->sg_data, namelen);
  495         splx(s);
  496 
  497         sg->sg_len = sg_len;
  498         sg->sg_family = AF_NETGRAPH;
  499         *addr = (struct sockaddr *)sg;
  500 
  501         return (0);
  502 }
  503 
  504 /*
  505  * Attach a socket to it's protocol specific partner.
  506  * For a control socket, actually create a netgraph node and attach
  507  * to it as well.
  508  */
  509 
  510 static int
  511 ng_attach_cntl(struct socket *so)
  512 {
  513         struct ngsock *privdata;
  514         struct ngpcb *pcbp;
  515         int error;
  516 
  517         /* Setup protocol control block */
  518         if ((error = ng_attach_common(so, NG_CONTROL)) != 0)
  519                 return (error);
  520         pcbp = sotongpcb(so);
  521 
  522         /* Allocate node private info */
  523         MALLOC(privdata, struct ngsock *,
  524             sizeof(*privdata), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO);
  525         if (privdata == NULL) {
  526                 ng_detach_common(pcbp, NG_CONTROL);
  527                 return (ENOMEM);
  528         }
  529 
  530         /* Make the generic node components */
  531         if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) {
  532                 FREE(privdata, M_NETGRAPH_SOCK);
  533                 ng_detach_common(pcbp, NG_CONTROL);
  534                 return (error);
  535         }
  536         NG_NODE_SET_PRIVATE(privdata->node, privdata);
  537 
  538         /* Link the pcb and the node private data */
  539         privdata->ctlsock = pcbp;
  540         pcbp->sockdata = privdata;
  541         privdata->refs++;
  542         return (0);
  543 }
  544 
  545 static int
  546 ng_attach_data(struct socket *so)
  547 {
  548         return(ng_attach_common(so, NG_DATA));
  549 }
  550 
  551 /*
  552  * Set up a socket protocol control block.
  553  * This code is shared between control and data sockets.
  554  */
  555 static int
  556 ng_attach_common(struct socket *so, int type)
  557 {
  558         struct ngpcb *pcbp;
  559         int error;
  560 
  561         /* Standard socket setup stuff */
  562         error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace);
  563         if (error)
  564                 return (error);
  565 
  566         /* Allocate the pcb */
  567         MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO);
  568         if (pcbp == NULL)
  569                 return (ENOMEM);
  570         pcbp->type = type;
  571 
  572         /* Link the pcb and the socket */
  573         so->so_pcb = (caddr_t) pcbp;
  574         pcbp->ng_socket = so;
  575 
  576         /* Add the socket to linked list */
  577         mtx_lock(&ngsocketlist_mtx);
  578         LIST_INSERT_HEAD(&ngsocklist, pcbp, socks);
  579         mtx_unlock(&ngsocketlist_mtx);
  580         return (0);
  581 }
  582 
  583 /*
  584  * Disassociate the socket from it's protocol specific
  585  * partner. If it's attached to a node's private data structure,
  586  * then unlink from that too. If we were the last socket attached to it,
  587  * then shut down the entire node. Shared code for control and data sockets.
  588  */
  589 static void
  590 ng_detach_common(struct ngpcb *pcbp, int which)
  591 {
  592         struct ngsock *priv;
  593 
  594         if (pcbp->sockdata) {
  595                 priv = pcbp->sockdata;
  596                 pcbp->sockdata = NULL;
  597                 switch (which) {
  598                 case NG_CONTROL:
  599                         priv->ctlsock = NULL;
  600                         break;
  601                 case NG_DATA:
  602                         priv->datasock = NULL;
  603                         break;
  604                 default:
  605                         panic(__func__);
  606                 }
  607                 if ((--priv->refs == 0) && (priv->node != NULL))
  608                         ng_rmnode_self(priv->node);
  609         }
  610         pcbp->ng_socket->so_pcb = NULL;
  611         pcbp->ng_socket = NULL;
  612         mtx_lock(&ngsocketlist_mtx);
  613         LIST_REMOVE(pcbp, socks);
  614         mtx_unlock(&ngsocketlist_mtx);
  615         FREE(pcbp, M_PCB);
  616 }
  617 
  618 #ifdef NOTYET
  619 /*
  620  * File descriptors can be passed into an AF_NETGRAPH socket.
  621  * Note, that file descriptors cannot be passed OUT.
  622  * Only character device descriptors are accepted.
  623  * Character devices are useful to connect a graph to a device,
  624  * which after all is the purpose of this whole system.
  625  */
  626 static int
  627 ng_internalize(struct mbuf *control, struct thread *td)
  628 {
  629         const struct cmsghdr *cm = mtod(control, const struct cmsghdr *);
  630         struct file *fp;
  631         struct vnode *vn;
  632         int oldfds;
  633         int fd;
  634 
  635         if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET ||
  636             cm->cmsg_len != control->m_len) {
  637                 TRAP_ERROR;
  638                 return (EINVAL);
  639         }
  640 
  641         /* Check there is only one FD. XXX what would more than one signify? */
  642         oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int);
  643         if (oldfds != 1) {
  644                 TRAP_ERROR;
  645                 return (EINVAL);
  646         }
  647 
  648         /* Check that the FD given is legit. and change it to a pointer to a
  649          * struct file. */
  650         fd = CMSG_DATA(cm);
  651         if ((error = fget(td, fd, &fp)) != 0)
  652                 return (error);
  653 
  654         /* Depending on what kind of resource it is, act differently. For
  655          * devices, we treat it as a file. For an AF_NETGRAPH socket,
  656          * shortcut straight to the node. */
  657         switch (fp->f_type) {
  658         case DTYPE_VNODE:
  659                 vn = fp->f_data;
  660                 if (vn && (vn->v_type == VCHR)) {
  661                         /* for a VCHR, actually reference the FILE */
  662                         fp->f_count++;
  663                         /* XXX then what :) */
  664                         /* how to pass on to other modules? */
  665                 } else {
  666                         fdrop(fp, td);
  667                         TRAP_ERROR;
  668                         return (EINVAL);
  669                 }
  670                 break;
  671         default:
  672                 fdrop(fp, td);
  673                 TRAP_ERROR;
  674                 return (EINVAL);
  675         }
  676         fdrop(fp, td);
  677         return (0);
  678 }
  679 #endif  /* NOTYET */
  680 
  681 /*
  682  * Connect the data socket to a named control socket node.
  683  */
  684 static int
  685 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp)
  686 {
  687         struct sockaddr_ng *sap;
  688         node_p farnode;
  689         struct ngsock *priv;
  690         int error;
  691         item_p item;
  692 
  693         /* If we are already connected, don't do it again */
  694         if (pcbp->sockdata != NULL)
  695                 return (EISCONN);
  696 
  697         /* Find the target (victim) and check it doesn't already have a data
  698          * socket. Also check it is a 'socket' type node.
  699          * Use ng_package_data() and address_path() to do this.
  700          */
  701 
  702         sap = (struct sockaddr_ng *) nam;
  703         /* The item will hold the node reference */
  704         item = ng_package_data(NULL, NULL);
  705         if (item == NULL) {
  706                 return (ENOMEM);
  707         }
  708         if ((error = ng_address_path(NULL, item,  sap->sg_data, 0)))
  709                 return (error); /* item is freed on failure */
  710 
  711         /*
  712          * Extract node from item and free item. Remember we now have
  713          * a reference on the node. The item holds it for us.
  714          * when we free the item we release the reference.
  715          */
  716         farnode = item->el_dest; /* shortcut */
  717         if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) {
  718                 NG_FREE_ITEM(item); /* drop the reference to the node */
  719                 return (EINVAL);
  720         }
  721         priv = NG_NODE_PRIVATE(farnode);
  722         if (priv->datasock != NULL) {
  723                 NG_FREE_ITEM(item);     /* drop the reference to the node */
  724                 return (EADDRINUSE);
  725         }
  726 
  727         /*
  728          * Link the PCB and the private data struct. and note the extra
  729          * reference. Drop the extra reference on the node.
  730          */
  731         priv->datasock = pcbp;
  732         pcbp->sockdata = priv;
  733         priv->refs++; /* XXX possible race if it's being freed */
  734         NG_FREE_ITEM(item);     /* drop the reference to the node */
  735         return (0);
  736 }
  737 
  738 /*
  739  * Binding a socket means giving the corresponding node a name
  740  */
  741 static int
  742 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp)
  743 {
  744         struct ngsock *const priv = pcbp->sockdata;
  745         struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam;
  746 
  747         if (priv == NULL) {
  748                 TRAP_ERROR;
  749                 return (EINVAL);
  750         }
  751         if ((sap->sg_len < 4)
  752         ||  (sap->sg_len > (NG_NODESIZ + 2))
  753         ||  (sap->sg_data[0] == '\0')
  754         ||  (sap->sg_data[sap->sg_len - 3] != '\0')) {
  755                 TRAP_ERROR;
  756                 return (EINVAL);
  757         }
  758         return (ng_name_node(priv->node, sap->sg_data));
  759 }
  760 
  761 /*
  762  * Take a message and pass it up to the control socket associated
  763  * with the node.
  764  */
  765 static int
  766 ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr)
  767 {
  768         struct socket *const so = pcbp->ng_socket;
  769         struct mbuf *mdata;
  770         int msglen;
  771 
  772         /* Copy the message itself into an mbuf chain */
  773         msglen = sizeof(struct ng_mesg) + msg->header.arglen;
  774         mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL);
  775 
  776         /* Here we free the message, as we are the end of the line.
  777          * We need to do that regardless of whether we got mbufs. */
  778         NG_FREE_MSG(msg);
  779 
  780         if (mdata == NULL) {
  781                 TRAP_ERROR;
  782                 return (ENOBUFS);
  783         }
  784 
  785         /* Send it up to the socket */
  786         if (sbappendaddr(&so->so_rcv,
  787             (struct sockaddr *) addr, mdata, NULL) == 0) {
  788                 TRAP_ERROR;
  789                 m_freem(mdata);
  790                 return (ENOBUFS);
  791         }
  792         sorwakeup(so);
  793         return (0);
  794 }
  795 
  796 /*
  797  * You can only create new nodes from the socket end of things.
  798  */
  799 static int
  800 ngs_constructor(node_p nodep)
  801 {
  802         return (EINVAL);
  803 }
  804 
  805 /*
  806  * We allow any hook to be connected to the node.
  807  * There is no per-hook private information though.
  808  */
  809 static int
  810 ngs_newhook(node_p node, hook_p hook, const char *name)
  811 {
  812         NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node));
  813         return (0);
  814 }
  815 
  816 /* 
  817  * if only one hook, allow read(2) and write(2) to work.
  818  */
  819 static int
  820 ngs_connect(hook_p hook)
  821 {
  822         node_p node = NG_HOOK_NODE(hook);
  823         struct ngsock *priv = NG_NODE_PRIVATE(node);
  824 
  825         if ((priv->datasock)
  826         &&  (priv->datasock->ng_socket)) {
  827                 if (NG_NODE_NUMHOOKS(node) == 1) {
  828                         priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
  829                 } else {
  830                         priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
  831                 }
  832         }
  833         return (0);
  834 }
  835 
  836 /*
  837  * Incoming messages get passed up to the control socket.
  838  * Unless they are for us specifically (socket_type)
  839  */
  840 static int
  841 ngs_rcvmsg(node_p node, item_p item, hook_p lasthook)
  842 {
  843         struct ngsock *const priv = NG_NODE_PRIVATE(node);
  844         struct ngpcb *const pcbp = priv->ctlsock;
  845         struct sockaddr_ng *addr;
  846         int addrlen;
  847         int error = 0;
  848         struct  ng_mesg *msg;
  849         ng_ID_t retaddr = NGI_RETADDR(item);
  850         char    retabuf[32];
  851 
  852         NGI_GET_MSG(item, msg);
  853         NG_FREE_ITEM(item); /* we have all we need */
  854 
  855         /* Only allow mesgs to be passed if we have the control socket.
  856          * Data sockets can only support the generic messages. */
  857         if (pcbp == NULL) {
  858                 TRAP_ERROR;
  859                 return (EINVAL);
  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 
  870 #endif
  871 
  872         if (msg->header.typecookie == NGM_SOCKET_COOKIE) {
  873                 switch (msg->header.cmd) {
  874                 case NGM_SOCK_CMD_NOLINGER:
  875                         priv->flags |= NGS_FLAG_NOLINGER;
  876                         break;
  877                 case NGM_SOCK_CMD_LINGER:
  878                         priv->flags &= ~NGS_FLAG_NOLINGER;
  879                         break;
  880                 default:
  881                         error = EINVAL;         /* unknown command */
  882                 }
  883                 /* Free the message and return */
  884                 NG_FREE_MSG(msg);
  885                 return(error);
  886 
  887         }
  888         /* Get the return address into a sockaddr */
  889         sprintf(retabuf,"[%x]:", retaddr);
  890         addrlen = strlen(retabuf);
  891         MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH_PATH, M_NOWAIT);
  892         if (addr == NULL) {
  893                 TRAP_ERROR;
  894                 return (ENOMEM);
  895         }
  896         addr->sg_len = addrlen + 3;
  897         addr->sg_family = AF_NETGRAPH;
  898         bcopy(retabuf, addr->sg_data, addrlen);
  899         addr->sg_data[addrlen] = '\0';
  900 
  901         /* Send it up */
  902         error = ship_msg(pcbp, msg, addr);
  903         FREE(addr, M_NETGRAPH_PATH);
  904         return (error);
  905 }
  906 
  907 /*
  908  * Receive data on a hook
  909  */
  910 static int
  911 ngs_rcvdata(hook_p hook, item_p item)
  912 {
  913         struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  914         struct ngpcb *const pcbp = priv->datasock;
  915         struct socket *so;
  916         struct sockaddr_ng *addr;
  917         char *addrbuf[NG_HOOKSIZ + 4];
  918         int addrlen;
  919         struct mbuf *m;
  920 
  921         NGI_GET_M(item, m);
  922         NG_FREE_ITEM(item);
  923         /* If there is no data socket, black-hole it */
  924         if (pcbp == NULL) {
  925                 NG_FREE_M(m);
  926                 return (0);
  927         }
  928         so = pcbp->ng_socket;
  929 
  930         /* Get the return address into a sockaddr. */
  931         addrlen = strlen(NG_HOOK_NAME(hook));   /* <= NG_HOOKSIZ - 1 */
  932         addr = (struct sockaddr_ng *) addrbuf;
  933         addr->sg_len = addrlen + 3;
  934         addr->sg_family = AF_NETGRAPH;
  935         bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen);
  936         addr->sg_data[addrlen] = '\0';
  937 
  938         /* Try to tell the socket which hook it came in on */
  939         if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) {
  940                 m_freem(m);
  941                 TRAP_ERROR;
  942                 return (ENOBUFS);
  943         }
  944         sorwakeup(so);
  945         return (0);
  946 }
  947 
  948 /*
  949  * Hook disconnection
  950  *
  951  * For this type, removal of the last link destroys the node
  952  * if the NOLINGER flag is set.
  953  */
  954 static int
  955 ngs_disconnect(hook_p hook)
  956 {
  957         node_p node = NG_HOOK_NODE(hook);
  958         struct ngsock *const priv = NG_NODE_PRIVATE(node);
  959 
  960         if ((priv->datasock)
  961         &&  (priv->datasock->ng_socket)) {
  962                 if (NG_NODE_NUMHOOKS(node) == 1) {
  963                         priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
  964                 } else {
  965                         priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
  966                 }
  967         }
  968 
  969         if ((priv->flags & NGS_FLAG_NOLINGER )
  970         && (NG_NODE_NUMHOOKS(node) == 0)
  971         && (NG_NODE_IS_VALID(node))) {
  972                 ng_rmnode_self(node);
  973         }
  974         return (0);
  975 }
  976 
  977 /*
  978  * Do local shutdown processing.
  979  * In this case, that involves making sure the socket
  980  * knows we should be shutting down.
  981  */
  982 static int
  983 ngs_shutdown(node_p node)
  984 {
  985         struct ngsock *const priv = NG_NODE_PRIVATE(node);
  986         struct ngpcb *const dpcbp = priv->datasock;
  987         struct ngpcb *const pcbp = priv->ctlsock;
  988 
  989         if (dpcbp != NULL) {
  990                 soisdisconnected(dpcbp->ng_socket);
  991                 dpcbp->sockdata = NULL;
  992                 priv->datasock = NULL;
  993                 priv->refs--;
  994         }
  995         if (pcbp != NULL) {
  996                 soisdisconnected(pcbp->ng_socket);
  997                 pcbp->sockdata = NULL;
  998                 priv->ctlsock = NULL;
  999                 priv->refs--;
 1000         }
 1001         NG_NODE_SET_PRIVATE(node, NULL);
 1002         NG_NODE_UNREF(node);
 1003         FREE(priv, M_NETGRAPH_SOCK);
 1004         return (0);
 1005 }
 1006 
 1007 static  int
 1008 dummy_disconnect(struct socket *so)
 1009 {
 1010         return (0);
 1011 }
 1012 /*
 1013  * Control and data socket type descriptors
 1014  */
 1015 
 1016 static struct pr_usrreqs ngc_usrreqs = {
 1017         NULL,                   /* abort */
 1018         pru_accept_notsupp,
 1019         ngc_attach,
 1020         ngc_bind,
 1021         ngc_connect,
 1022         pru_connect2_notsupp,
 1023         pru_control_notsupp,
 1024         ngc_detach,
 1025         dummy_disconnect,       /* disconnect */
 1026         pru_listen_notsupp,
 1027         NULL,                   /* setpeeraddr */
 1028         pru_rcvd_notsupp,
 1029         pru_rcvoob_notsupp,
 1030         ngc_send,
 1031         pru_sense_null,
 1032         NULL,                   /* shutdown */
 1033         ng_setsockaddr,
 1034         sosend,
 1035         soreceive,
 1036         sopoll,
 1037         pru_sosetlabel_null
 1038 };
 1039 
 1040 static struct pr_usrreqs ngd_usrreqs = {
 1041         NULL,                   /* abort */
 1042         pru_accept_notsupp,
 1043         ngd_attach,
 1044         NULL,                   /* bind */
 1045         ngd_connect,
 1046         pru_connect2_notsupp,
 1047         pru_control_notsupp,
 1048         ngd_detach,
 1049         dummy_disconnect,       /* disconnect */
 1050         pru_listen_notsupp,
 1051         NULL,                   /* setpeeraddr */
 1052         pru_rcvd_notsupp,
 1053         pru_rcvoob_notsupp,
 1054         ngd_send,
 1055         pru_sense_null,
 1056         NULL,                   /* shutdown */
 1057         ng_setsockaddr,
 1058         sosend,
 1059         soreceive,
 1060         sopoll,
 1061         pru_sosetlabel_null
 1062 };
 1063 
 1064 /*
 1065  * Definitions of protocols supported in the NETGRAPH domain.
 1066  */
 1067 
 1068 extern struct domain ngdomain;          /* stop compiler warnings */
 1069 
 1070 static struct protosw ngsw[] = {
 1071         {
 1072                 SOCK_DGRAM,             /* protocol type */
 1073                 &ngdomain,              /* backpointer to domain */
 1074                 NG_CONTROL,
 1075                 PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */,  /* flags */
 1076                 0, 0, 0, 0,             /* input, output, ctlinput, ctloutput */
 1077                 NULL,                   /* ousrreq */
 1078                 0, 0, 0, 0,             /* init, fasttimeo, slowtimo, drain */
 1079                 &ngc_usrreqs,           /* usrreq table (above) */
 1080                 /*{NULL}*/              /* pffh (protocol filter head?) */
 1081         },
 1082         {
 1083                 SOCK_DGRAM,             /* protocol type */
 1084                 &ngdomain,              /* backpointer to domain */
 1085                 NG_DATA,
 1086                 PR_ATOMIC | PR_ADDR,    /* flags */
 1087                 0, 0, 0, 0,             /* input, output, ctlinput, ctloutput */
 1088                 NULL,                   /* ousrreq() */
 1089                 0, 0, 0, 0,             /* init, fasttimeo, slowtimo, drain */
 1090                 &ngd_usrreqs,           /* usrreq table (above) */
 1091                 /*{NULL}*/              /* pffh (protocol filter head?) */
 1092         }
 1093 };
 1094 
 1095 struct domain ngdomain = {
 1096         AF_NETGRAPH,
 1097         "netgraph",
 1098         NULL,                                   /* init() */
 1099         NULL,                                   /* externalise() */
 1100         NULL,                                   /* dispose() */
 1101         ngsw,                                   /* protosw entry */
 1102         &ngsw[sizeof(ngsw) / sizeof(ngsw[0])],  /* Number of protosw entries */
 1103         NULL,                                   /* next domain in list */
 1104         NULL,                                   /* rtattach() */
 1105         0,                                      /* arg to rtattach in bits */
 1106         0                                       /* maxrtkey */
 1107 };
 1108 
 1109 /*
 1110  * Handle loading and unloading for this node type
 1111  * This is to handle auxiliary linkages (e.g protocol domain addition).
 1112  */
 1113 static int
 1114 ngs_mod_event(module_t mod, int event, void *data)
 1115 {
 1116         int error = 0;
 1117 
 1118         switch (event) {
 1119         case MOD_LOAD:
 1120                 /* Register protocol domain */
 1121                 net_add_domain(&ngdomain);
 1122                 break;
 1123         case MOD_UNLOAD:
 1124                 /* Insure there are no open netgraph sockets */
 1125                 if (!LIST_EMPTY(&ngsocklist)) {
 1126                         error = EBUSY;
 1127                         break;
 1128                 }
 1129 
 1130 #ifdef NOTYET
 1131                 if ((LIST_EMPTY(&ngsocklist)) && (typestruct.refs == 0)) {
 1132                 /* Unregister protocol domain XXX can't do this yet.. */
 1133                         if ((error = net_rm_domain(&ngdomain)) != 0)
 1134                                 break;
 1135                 } else
 1136 #endif
 1137                         error = EBUSY;
 1138                 break;
 1139         default:
 1140                 error = EOPNOTSUPP;
 1141                 break;
 1142         }
 1143         return (error);
 1144 }
 1145 
 1146 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, "");
 1147 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA");
 1148 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, "");
 1149 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL");
 1150 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, "");
 1151 

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