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  * Copyright (c) 1996-1999 Whistle Communications, Inc.
    5  * All rights reserved.
    6  *
    7  * Subject to the following obligations and disclaimer of warranty, use and
    8  * redistribution of this software, in source or object code forms, with or
    9  * without modifications are expressly permitted by Whistle Communications;
   10  * provided, however, that:
   11  * 1. Any and all reproductions of the source or object code must include the
   12  *    copyright notice above and the following disclaimer of warranties; and
   13  * 2. No rights are granted, in any manner or form, to use Whistle
   14  *    Communications, Inc. trademarks, including the mark "WHISTLE
   15  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   16  *    such appears in the above copyright notice or in the software.
   17  *
   18  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   19  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   20  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   21  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   22  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   23  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   24  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   25  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   26  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   27  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   28  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   29  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   30  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   31  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   32  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   33  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   34  * OF SUCH DAMAGE.
   35  *
   36  * Author: Julian Elischer <julian@freebsd.org>
   37  *
   38  * $FreeBSD: releng/5.3/sys/netgraph/ng_socket.c 136588 2004-10-16 08:43:07Z cvs2svn $
   39  * $Whistle: ng_socket.c,v 1.28 1999/11/01 09:24:52 julian Exp $
   40  */
   41 
   42 /*
   43  * Netgraph socket nodes
   44  *
   45  * There are two types of netgraph sockets, control and data.
   46  * Control sockets have a netgraph node, but data sockets are
   47  * parasitic on control sockets, and have no node of their own.
   48  */
   49 
   50 #include <sys/param.h>
   51 #include <sys/domain.h>
   52 #include <sys/errno.h>
   53 #include <sys/kdb.h>
   54 #include <sys/kernel.h>
   55 #include <sys/linker.h>
   56 #include <sys/lock.h>
   57 #include <sys/malloc.h>
   58 #include <sys/mbuf.h>
   59 #include <sys/mutex.h>
   60 #include <sys/protosw.h>
   61 #include <sys/queue.h>
   62 #include <sys/signalvar.h>
   63 #include <sys/socket.h>
   64 #include <sys/socketvar.h>
   65 #include <sys/sx.h>
   66 #include <sys/sysctl.h>
   67 #include <sys/systm.h>
   68 #ifdef NOTYET
   69 #include <sys/vnode.h>
   70 #endif
   71 #include <netgraph/ng_message.h>
   72 #include <netgraph/netgraph.h>
   73 #include <netgraph/ng_socketvar.h>
   74 #include <netgraph/ng_socket.h>
   75 
   76 #ifdef NG_SEPARATE_MALLOC
   77 MALLOC_DEFINE(M_NETGRAPH_PATH, "netgraph_path", "netgraph path info ");
   78 MALLOC_DEFINE(M_NETGRAPH_SOCK, "netgraph_sock", "netgraph socket info ");
   79 #else
   80 #define M_NETGRAPH_PATH M_NETGRAPH
   81 #define M_NETGRAPH_SOCK M_NETGRAPH
   82 #endif
   83 
   84 /*
   85  * It's Ascii-art time!
   86  *   +-------------+   +-------------+
   87  *   |socket  (ctl)|   |socket (data)|
   88  *   +-------------+   +-------------+
   89  *          ^                 ^
   90  *          |                 |
   91  *          v                 v
   92  *    +-----------+     +-----------+
   93  *    |pcb   (ctl)|     |pcb  (data)|
   94  *    +-----------+     +-----------+
   95  *          ^                 ^
   96  *          |                 |
   97  *          v                 v
   98  *      +--------------------------+
   99  *      |   Socket type private    |
  100  *      |       data               |
  101  *      +--------------------------+
  102  *                   ^
  103  *                   |
  104  *                   v
  105  *           +----------------+
  106  *           | struct ng_node |
  107  *           +----------------+
  108  */
  109 
  110 /* Netgraph node methods */
  111 static ng_constructor_t ngs_constructor;
  112 static ng_rcvmsg_t      ngs_rcvmsg;
  113 static ng_shutdown_t    ngs_shutdown;
  114 static ng_newhook_t     ngs_newhook;
  115 static ng_connect_t     ngs_connect;
  116 static ng_rcvdata_t     ngs_rcvdata;
  117 static ng_disconnect_t  ngs_disconnect;
  118 
  119 /* Internal methods */
  120 static int      ng_attach_data(struct socket *so);
  121 static int      ng_attach_cntl(struct socket *so);
  122 static int      ng_attach_common(struct socket *so, int type);
  123 static void     ng_detach_common(struct ngpcb *pcbp, int type);
  124 /*static int    ng_internalize(struct mbuf *m, struct thread *p); */
  125 
  126 static int      ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp);
  127 static int      ng_bind(struct sockaddr *nam, struct ngpcb *pcbp);
  128 
  129 static int      ngs_mod_event(module_t mod, int event, void *data);
  130 static int      ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg,
  131                         struct sockaddr_ng *addr);
  132 
  133 /* Netgraph type descriptor */
  134 static struct ng_type typestruct = {
  135         .version =      NG_ABI_VERSION,
  136         .name =         NG_SOCKET_NODE_TYPE,
  137         .mod_event =    ngs_mod_event,
  138         .constructor =  ngs_constructor,
  139         .rcvmsg =       ngs_rcvmsg,
  140         .shutdown =     ngs_shutdown,
  141         .newhook =      ngs_newhook,
  142         .connect =      ngs_connect,
  143         .rcvdata =      ngs_rcvdata,
  144         .disconnect =   ngs_disconnect,
  145 };
  146 NETGRAPH_INIT(socket, &typestruct);
  147 
  148 /* Buffer space */
  149 static u_long ngpdg_sendspace = 20 * 1024;      /* really max datagram size */
  150 SYSCTL_INT(_net_graph, OID_AUTO, maxdgram, CTLFLAG_RW,
  151     &ngpdg_sendspace , 0, "Maximum outgoing Netgraph datagram size");
  152 static u_long ngpdg_recvspace = 20 * 1024;
  153 SYSCTL_INT(_net_graph, OID_AUTO, recvspace, CTLFLAG_RW,
  154     &ngpdg_recvspace , 0, "Maximum space for incoming Netgraph datagrams");
  155 
  156 /* List of all sockets */
  157 static LIST_HEAD(, ngpcb) ngsocklist;
  158 
  159 static struct mtx       ngsocketlist_mtx;
  160 MTX_SYSINIT(ngsocketlist, &ngsocketlist_mtx, "ng_socketlist", MTX_DEF);
  161 
  162 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb)
  163 
  164 /* If getting unexplained errors returned, set this to "kdb_enter("X"); */
  165 #ifndef TRAP_ERROR
  166 #define TRAP_ERROR
  167 #endif
  168 
  169 /***************************************************************
  170         Control sockets
  171 ***************************************************************/
  172 
  173 static int
  174 ngc_attach(struct socket *so, int proto, struct thread *td)
  175 {
  176         struct ngpcb *const pcbp = sotongpcb(so);
  177 
  178         if (suser(td))
  179                 return (EPERM);
  180         if (pcbp != NULL)
  181                 return (EISCONN);
  182         return (ng_attach_cntl(so));
  183 }
  184 
  185 static int
  186 ngc_detach(struct socket *so)
  187 {
  188         struct ngpcb *const pcbp = sotongpcb(so);
  189 
  190         if (pcbp == NULL)
  191                 return (EINVAL);
  192         ng_detach_common(pcbp, NG_CONTROL);
  193         return (0);
  194 }
  195 
  196 static int
  197 ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  198          struct mbuf *control, struct thread *td)
  199 {
  200         struct ngpcb *const pcbp = sotongpcb(so);
  201         struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
  202         struct ng_mesg *msg;
  203         struct mbuf *m0;
  204         char *path = NULL;
  205         int len, error = 0;
  206 
  207         if (pcbp == NULL) {
  208                 error = EINVAL;
  209                 goto release;
  210         }
  211 #ifdef  NOTYET
  212         if (control && (error = ng_internalize(control, td))) {
  213                 if (pcbp->sockdata == NULL) {
  214                         error = ENOTCONN;
  215                         goto release;
  216                 }
  217         }
  218 #else   /* NOTYET */
  219         if (control) {
  220                 error = EINVAL;
  221                 goto release;
  222         }
  223 #endif  /* NOTYET */
  224 
  225         /* Require destination as there may be >= 1 hooks on this node */
  226         if (addr == NULL) {
  227                 error = EDESTADDRREQ;
  228                 goto release;
  229         }
  230 
  231         /* Allocate an expendable buffer for the path, chop off
  232          * the sockaddr header, and make sure it's NUL terminated */
  233         len = sap->sg_len - 2;
  234         MALLOC(path, char *, len + 1, M_NETGRAPH_PATH, M_WAITOK);
  235         if (path == NULL) {
  236                 error = ENOMEM;
  237                 goto release;
  238         }
  239         bcopy(sap->sg_data, path, len);
  240         path[len] = '\0';
  241 
  242         /* Move the actual message out of mbufs into a linear buffer.
  243          * Start by adding up the size of the data. (could use mh_len?) */
  244         for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next)
  245                 len += m0->m_len;
  246 
  247         /* Move the data into a linear buffer as well. Messages are not
  248          * delivered in mbufs. */
  249         MALLOC(msg, struct ng_mesg *, len + 1, M_NETGRAPH_MSG, M_WAITOK);
  250         if (msg == NULL) {
  251                 error = ENOMEM;
  252                 goto release;
  253         }
  254         m_copydata(m, 0, len, (char *)msg);
  255 
  256 #ifdef TRACE_MESSAGES
  257         do {                                                            
  258                 item_p item;                                            
  259                 if ((item = ng_package_msg(msg)) == NULL) {             
  260                         (msg) = NULL;                           
  261                         (error) = ENOMEM;                               
  262 printf("err=%d\n",error);
  263                         break;                                          
  264                 }                                                       
  265                 if (((error) = ng_address_path((pcbp->sockdata->node), (item),          
  266                                         (path), (NULL))) == 0) {        
  267 printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n",
  268 item->el_dest->nd_ID,
  269 msg->header.typecookie,
  270 msg->header.cmd,
  271 msg->header.cmdstr,
  272 msg->header.flags,
  273 msg->header.token,
  274 item->el_dest->nd_type->name); 
  275                         SAVE_LINE(item);                        
  276                         (error) = ng_snd_item((item), 0);               
  277                 }                                                       
  278 else {
  279 printf("errx=%d\n",error);
  280 }
  281                 (msg) = NULL;                                           
  282         } while (0);
  283 
  284 #else
  285         /*
  286          * Hack alert!
  287          * We look into the message and if it mkpeers a node of unknown type, we
  288          * try to load it. We need to do this now, in syscall thread, because if
  289          * message gets queued and applied later we will get panic.
  290          */
  291         if (msg->header.typecookie == NGM_GENERIC_COOKIE &&
  292             msg->header.cmd == NGM_MKPEER) {
  293                 struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data;
  294                 struct ng_type *type;
  295 
  296                 if ((type = ng_findtype(mkp->type)) == NULL) {
  297                         char filename[NG_TYPESIZ + 3];
  298                         linker_file_t lf;
  299                         int error;
  300 
  301                         /* Not found, try to load it as a loadable module */
  302                         snprintf(filename, sizeof(filename), "ng_%s", mkp->type);
  303                         mtx_lock(&Giant);
  304                         error = linker_load_module(NULL, filename, NULL, NULL, &lf);
  305                         mtx_unlock(&Giant);
  306                         if (error != 0) {
  307                                 FREE(msg, M_NETGRAPH_MSG);
  308                                 goto release;
  309                         }
  310                         lf->userrefs++;
  311 
  312                         /* Try again, as now the type should have linked itself in */
  313                         if ((type = ng_findtype(mkp->type)) == NULL) {
  314                                 FREE(msg, M_NETGRAPH_MSG);
  315                                 error =  ENXIO;
  316                                 goto release;
  317                         }
  318                 }
  319         }
  320 
  321         /* The callee will free the msg when done. The path is our business. */
  322         NG_SEND_MSG_PATH(error, pcbp->sockdata->node, msg, path, 0);
  323 #endif
  324 release:
  325         if (path != NULL)
  326                 FREE(path, M_NETGRAPH_PATH);
  327         if (control != NULL)
  328                 m_freem(control);
  329         if (m != NULL)
  330                 m_freem(m);
  331         return (error);
  332 }
  333 
  334 static int
  335 ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  336 {
  337         struct ngpcb *const pcbp = sotongpcb(so);
  338 
  339         if (pcbp == 0)
  340                 return (EINVAL);
  341         return (ng_bind(nam, pcbp));
  342 }
  343 
  344 static int
  345 ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  346 {
  347 printf(" program tried to connect control socket to remote node\n ");
  348         /*
  349          * At this time refuse to do this.. it used to
  350          * do something but it was undocumented and not used.
  351          */
  352         return (EINVAL);
  353 }
  354 
  355 /***************************************************************
  356         Data sockets
  357 ***************************************************************/
  358 
  359 static int
  360 ngd_attach(struct socket *so, int proto, struct thread *td)
  361 {
  362         struct ngpcb *const pcbp = sotongpcb(so);
  363 
  364         if (pcbp != NULL)
  365                 return (EISCONN);
  366         return (ng_attach_data(so));
  367 }
  368 
  369 static int
  370 ngd_detach(struct socket *so)
  371 {
  372         struct ngpcb *const pcbp = sotongpcb(so);
  373 
  374         if (pcbp == NULL)
  375                 return (EINVAL);
  376         ng_detach_common(pcbp, NG_DATA);
  377         return (0);
  378 }
  379 
  380 static int
  381 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  382          struct mbuf *control, struct thread *td)
  383 {
  384         struct ngpcb *const pcbp = sotongpcb(so);
  385         struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
  386         int     len, error;
  387         hook_p  hook = NULL;
  388         char    hookname[NG_HOOKSIZ];
  389 
  390         if ((pcbp == NULL) || (control != NULL)) {
  391                 error = EINVAL;
  392                 goto release;
  393         }
  394         if (pcbp->sockdata == NULL) {
  395                 error = ENOTCONN;
  396                 goto release;
  397         }
  398         /*
  399          * If the user used any of these ways to not specify an address
  400          * then handle specially.
  401          */
  402         if ((sap == NULL)
  403             || ((len = sap->sg_len - 2) <= 0)
  404             || (*sap->sg_data == '\0')) {
  405                 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) {
  406                         error = EDESTADDRREQ;
  407                         goto release;
  408                 }
  409                 /*
  410                  * if exactly one hook exists, just use it.
  411                  * Special case to allow write(2) to work on an ng_socket.
  412                  */
  413                 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks);
  414         } else {
  415                 if (len >= NG_HOOKSIZ) {
  416                         error = EINVAL;
  417                         goto release;
  418                 }
  419 
  420                 /*
  421                  * chop off the sockaddr header, and make sure it's NUL
  422                  * terminated
  423                  */
  424                 bcopy(sap->sg_data, hookname, len);
  425                 hookname[len] = '\0';
  426 
  427                 /* Find the correct hook from 'hookname' */
  428                 LIST_FOREACH(hook, &pcbp->sockdata->node->nd_hooks, hk_hooks) {
  429                         if (strcmp(hookname, NG_HOOK_NAME(hook)) == 0) {
  430                                 break;
  431                         }
  432                 }
  433                 if (hook == NULL) {
  434                         error = EHOSTUNREACH;
  435                 }
  436         }
  437 
  438         /* Send data (OK if hook is NULL) */
  439         NG_SEND_DATA_ONLY(error, hook, m);      /* makes m NULL */
  440 
  441 release:
  442         if (control != NULL)
  443                 m_freem(control);
  444         if (m != NULL)
  445                 m_freem(m);
  446         return (error);
  447 }
  448 
  449 static int
  450 ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  451 {
  452         struct ngpcb *const pcbp = sotongpcb(so);
  453 
  454         if (pcbp == 0)
  455                 return (EINVAL);
  456         return (ng_connect_data(nam, pcbp));
  457 }
  458 
  459 /*
  460  * Used for both data and control sockets
  461  */
  462 static int
  463 ng_setsockaddr(struct socket *so, struct sockaddr **addr)
  464 {
  465         struct ngpcb *pcbp;
  466         struct sockaddr_ng *sg;
  467         int sg_len, namelen, s;
  468 
  469         /* Why isn't sg_data a `char[1]' ? :-( */
  470         sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1;
  471 
  472         s = splnet();
  473         pcbp = sotongpcb(so);
  474         if ((pcbp == NULL) || (pcbp->sockdata == NULL)) {
  475                 splx(s);
  476                 return (EINVAL);
  477         }
  478 
  479         namelen = 0;            /* silence compiler ! */
  480         if ( NG_NODE_HAS_NAME(pcbp->sockdata->node))
  481                 sg_len += namelen = strlen(NG_NODE_NAME(pcbp->sockdata->node));
  482 
  483         MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK | M_ZERO);
  484 
  485         if (NG_NODE_HAS_NAME(pcbp->sockdata->node))
  486                 bcopy(NG_NODE_NAME(pcbp->sockdata->node), sg->sg_data, namelen);
  487         splx(s);
  488 
  489         sg->sg_len = sg_len;
  490         sg->sg_family = AF_NETGRAPH;
  491         *addr = (struct sockaddr *)sg;
  492 
  493         return (0);
  494 }
  495 
  496 /*
  497  * Attach a socket to it's protocol specific partner.
  498  * For a control socket, actually create a netgraph node and attach
  499  * to it as well.
  500  */
  501 
  502 static int
  503 ng_attach_cntl(struct socket *so)
  504 {
  505         struct ngsock *privdata;
  506         struct ngpcb *pcbp;
  507         int error;
  508 
  509         /* Setup protocol control block */
  510         if ((error = ng_attach_common(so, NG_CONTROL)) != 0)
  511                 return (error);
  512         pcbp = sotongpcb(so);
  513 
  514         /* Allocate node private info */
  515         MALLOC(privdata, struct ngsock *,
  516             sizeof(*privdata), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO);
  517         if (privdata == NULL) {
  518                 ng_detach_common(pcbp, NG_CONTROL);
  519                 return (ENOMEM);
  520         }
  521 
  522         /* Make the generic node components */
  523         if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) {
  524                 FREE(privdata, M_NETGRAPH_SOCK);
  525                 ng_detach_common(pcbp, NG_CONTROL);
  526                 return (error);
  527         }
  528         NG_NODE_SET_PRIVATE(privdata->node, privdata);
  529 
  530         /* Link the pcb and the node private data */
  531         privdata->ctlsock = pcbp;
  532         pcbp->sockdata = privdata;
  533         privdata->refs++;
  534         return (0);
  535 }
  536 
  537 static int
  538 ng_attach_data(struct socket *so)
  539 {
  540         return(ng_attach_common(so, NG_DATA));
  541 }
  542 
  543 /*
  544  * Set up a socket protocol control block.
  545  * This code is shared between control and data sockets.
  546  */
  547 static int
  548 ng_attach_common(struct socket *so, int type)
  549 {
  550         struct ngpcb *pcbp;
  551         int error;
  552 
  553         /* Standard socket setup stuff */
  554         error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace);
  555         if (error)
  556                 return (error);
  557 
  558         /* Allocate the pcb */
  559         MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO);
  560         if (pcbp == NULL)
  561                 return (ENOMEM);
  562         pcbp->type = type;
  563 
  564         /* Link the pcb and the socket */
  565         so->so_pcb = (caddr_t) pcbp;
  566         pcbp->ng_socket = so;
  567 
  568         /* Add the socket to linked list */
  569         mtx_lock(&ngsocketlist_mtx);
  570         LIST_INSERT_HEAD(&ngsocklist, pcbp, socks);
  571         mtx_unlock(&ngsocketlist_mtx);
  572         return (0);
  573 }
  574 
  575 /*
  576  * Disassociate the socket from it's protocol specific
  577  * partner. If it's attached to a node's private data structure,
  578  * then unlink from that too. If we were the last socket attached to it,
  579  * then shut down the entire node. Shared code for control and data sockets.
  580  */
  581 static void
  582 ng_detach_common(struct ngpcb *pcbp, int which)
  583 {
  584         struct ngsock *priv;
  585 
  586         if (pcbp->sockdata) {
  587                 priv = pcbp->sockdata;
  588                 pcbp->sockdata = NULL;
  589                 switch (which) {
  590                 case NG_CONTROL:
  591                         priv->ctlsock = NULL;
  592                         break;
  593                 case NG_DATA:
  594                         priv->datasock = NULL;
  595                         break;
  596                 default:
  597                         panic(__func__);
  598                 }
  599                 if ((--priv->refs == 0) && (priv->node != NULL))
  600                         ng_rmnode_self(priv->node);
  601         }
  602         pcbp->ng_socket->so_pcb = NULL;
  603         pcbp->ng_socket = NULL;
  604         mtx_lock(&ngsocketlist_mtx);
  605         LIST_REMOVE(pcbp, socks);
  606         mtx_unlock(&ngsocketlist_mtx);
  607         FREE(pcbp, M_PCB);
  608 }
  609 
  610 #ifdef NOTYET
  611 /*
  612  * File descriptors can be passed into an AF_NETGRAPH socket.
  613  * Note, that file descriptors cannot be passed OUT.
  614  * Only character device descriptors are accepted.
  615  * Character devices are useful to connect a graph to a device,
  616  * which after all is the purpose of this whole system.
  617  */
  618 static int
  619 ng_internalize(struct mbuf *control, struct thread *td)
  620 {
  621         const struct cmsghdr *cm = mtod(control, const struct cmsghdr *);
  622         struct file *fp;
  623         struct vnode *vn;
  624         int oldfds;
  625         int fd;
  626 
  627         if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET ||
  628             cm->cmsg_len != control->m_len) {
  629                 TRAP_ERROR;
  630                 return (EINVAL);
  631         }
  632 
  633         /* Check there is only one FD. XXX what would more than one signify? */
  634         oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int);
  635         if (oldfds != 1) {
  636                 TRAP_ERROR;
  637                 return (EINVAL);
  638         }
  639 
  640         /* Check that the FD given is legit. and change it to a pointer to a
  641          * struct file. */
  642         fd = CMSG_DATA(cm);
  643         if ((error = fget(td, fd, &fp)) != 0)
  644                 return (error);
  645 
  646         /* Depending on what kind of resource it is, act differently. For
  647          * devices, we treat it as a file. For an AF_NETGRAPH socket,
  648          * shortcut straight to the node. */
  649         switch (fp->f_type) {
  650         case DTYPE_VNODE:
  651                 vn = fp->f_data;
  652                 if (vn && (vn->v_type == VCHR)) {
  653                         /* for a VCHR, actually reference the FILE */
  654                         fp->f_count++;
  655                         /* XXX then what :) */
  656                         /* how to pass on to other modules? */
  657                 } else {
  658                         fdrop(fp, td);
  659                         TRAP_ERROR;
  660                         return (EINVAL);
  661                 }
  662                 break;
  663         default:
  664                 fdrop(fp, td);
  665                 TRAP_ERROR;
  666                 return (EINVAL);
  667         }
  668         fdrop(fp, td);
  669         return (0);
  670 }
  671 #endif  /* NOTYET */
  672 
  673 /*
  674  * Connect the data socket to a named control socket node.
  675  */
  676 static int
  677 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp)
  678 {
  679         struct sockaddr_ng *sap;
  680         node_p farnode;
  681         struct ngsock *priv;
  682         int error;
  683         item_p item;
  684 
  685         /* If we are already connected, don't do it again */
  686         if (pcbp->sockdata != NULL)
  687                 return (EISCONN);
  688 
  689         /* Find the target (victim) and check it doesn't already have a data
  690          * socket. Also check it is a 'socket' type node.
  691          * Use ng_package_data() and address_path() to do this.
  692          */
  693 
  694         sap = (struct sockaddr_ng *) nam;
  695         /* The item will hold the node reference */
  696         item = ng_package_data(NULL, NULL);
  697         if (item == NULL) {
  698                 return (ENOMEM);
  699         }
  700         if ((error = ng_address_path(NULL, item,  sap->sg_data, 0)))
  701                 return (error); /* item is freed on failure */
  702 
  703         /*
  704          * Extract node from item and free item. Remember we now have
  705          * a reference on the node. The item holds it for us.
  706          * when we free the item we release the reference.
  707          */
  708         farnode = item->el_dest; /* shortcut */
  709         if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) {
  710                 NG_FREE_ITEM(item); /* drop the reference to the node */
  711                 return (EINVAL);
  712         }
  713         priv = NG_NODE_PRIVATE(farnode);
  714         if (priv->datasock != NULL) {
  715                 NG_FREE_ITEM(item);     /* drop the reference to the node */
  716                 return (EADDRINUSE);
  717         }
  718 
  719         /*
  720          * Link the PCB and the private data struct. and note the extra
  721          * reference. Drop the extra reference on the node.
  722          */
  723         priv->datasock = pcbp;
  724         pcbp->sockdata = priv;
  725         priv->refs++; /* XXX possible race if it's being freed */
  726         NG_FREE_ITEM(item);     /* drop the reference to the node */
  727         return (0);
  728 }
  729 
  730 /*
  731  * Binding a socket means giving the corresponding node a name
  732  */
  733 static int
  734 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp)
  735 {
  736         struct ngsock *const priv = pcbp->sockdata;
  737         struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam;
  738 
  739         if (priv == NULL) {
  740                 TRAP_ERROR;
  741                 return (EINVAL);
  742         }
  743         if ((sap->sg_len < 4)
  744         ||  (sap->sg_len > (NG_NODESIZ + 2))
  745         ||  (sap->sg_data[0] == '\0')
  746         ||  (sap->sg_data[sap->sg_len - 3] != '\0')) {
  747                 TRAP_ERROR;
  748                 return (EINVAL);
  749         }
  750         return (ng_name_node(priv->node, sap->sg_data));
  751 }
  752 
  753 /*
  754  * Take a message and pass it up to the control socket associated
  755  * with the node.
  756  */
  757 static int
  758 ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr)
  759 {
  760         struct socket *const so = pcbp->ng_socket;
  761         struct mbuf *mdata;
  762         int msglen;
  763 
  764         /* Copy the message itself into an mbuf chain */
  765         msglen = sizeof(struct ng_mesg) + msg->header.arglen;
  766         mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL);
  767 
  768         /* Here we free the message, as we are the end of the line.
  769          * We need to do that regardless of whether we got mbufs. */
  770         NG_FREE_MSG(msg);
  771 
  772         if (mdata == NULL) {
  773                 TRAP_ERROR;
  774                 return (ENOBUFS);
  775         }
  776 
  777         /* Send it up to the socket */
  778         if (sbappendaddr(&so->so_rcv,
  779             (struct sockaddr *) addr, mdata, NULL) == 0) {
  780                 TRAP_ERROR;
  781                 m_freem(mdata);
  782                 return (ENOBUFS);
  783         }
  784         sorwakeup(so);
  785         return (0);
  786 }
  787 
  788 /*
  789  * You can only create new nodes from the socket end of things.
  790  */
  791 static int
  792 ngs_constructor(node_p nodep)
  793 {
  794         return (EINVAL);
  795 }
  796 
  797 /*
  798  * We allow any hook to be connected to the node.
  799  * There is no per-hook private information though.
  800  */
  801 static int
  802 ngs_newhook(node_p node, hook_p hook, const char *name)
  803 {
  804         NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node));
  805         return (0);
  806 }
  807 
  808 /* 
  809  * if only one hook, allow read(2) and write(2) to work.
  810  */
  811 static int
  812 ngs_connect(hook_p hook)
  813 {
  814         node_p node = NG_HOOK_NODE(hook);
  815         struct ngsock *priv = NG_NODE_PRIVATE(node);
  816 
  817         if ((priv->datasock)
  818         &&  (priv->datasock->ng_socket)) {
  819                 if (NG_NODE_NUMHOOKS(node) == 1) {
  820                         priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
  821                 } else {
  822                         priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
  823                 }
  824         }
  825         return (0);
  826 }
  827 
  828 /*
  829  * Incoming messages get passed up to the control socket.
  830  * Unless they are for us specifically (socket_type)
  831  */
  832 static int
  833 ngs_rcvmsg(node_p node, item_p item, hook_p lasthook)
  834 {
  835         struct ngsock *const priv = NG_NODE_PRIVATE(node);
  836         struct ngpcb *const pcbp = priv->ctlsock;
  837         struct sockaddr_ng *addr;
  838         int addrlen;
  839         int error = 0;
  840         struct  ng_mesg *msg;
  841         ng_ID_t retaddr = NGI_RETADDR(item);
  842         char    retabuf[32];
  843 
  844         NGI_GET_MSG(item, msg);
  845         NG_FREE_ITEM(item); /* we have all we need */
  846 
  847         /* Only allow mesgs to be passed if we have the control socket.
  848          * Data sockets can only support the generic messages. */
  849         if (pcbp == NULL) {
  850                 TRAP_ERROR;
  851                 return (EINVAL);
  852         }
  853 #ifdef TRACE_MESSAGES
  854 printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n",
  855 retaddr,
  856 msg->header.typecookie,
  857 msg->header.cmd,
  858 msg->header.cmdstr,
  859 msg->header.flags,
  860 msg->header.token);
  861 
  862 #endif
  863 
  864         if (msg->header.typecookie == NGM_SOCKET_COOKIE) {
  865                 switch (msg->header.cmd) {
  866                 case NGM_SOCK_CMD_NOLINGER:
  867                         priv->flags |= NGS_FLAG_NOLINGER;
  868                         break;
  869                 case NGM_SOCK_CMD_LINGER:
  870                         priv->flags &= ~NGS_FLAG_NOLINGER;
  871                         break;
  872                 default:
  873                         error = EINVAL;         /* unknown command */
  874                 }
  875                 /* Free the message and return */
  876                 NG_FREE_MSG(msg);
  877                 return(error);
  878 
  879         }
  880         /* Get the return address into a sockaddr */
  881         sprintf(retabuf,"[%x]:", retaddr);
  882         addrlen = strlen(retabuf);
  883         MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH_PATH, M_NOWAIT);
  884         if (addr == NULL) {
  885                 TRAP_ERROR;
  886                 return (ENOMEM);
  887         }
  888         addr->sg_len = addrlen + 3;
  889         addr->sg_family = AF_NETGRAPH;
  890         bcopy(retabuf, addr->sg_data, addrlen);
  891         addr->sg_data[addrlen] = '\0';
  892 
  893         /* Send it up */
  894         error = ship_msg(pcbp, msg, addr);
  895         FREE(addr, M_NETGRAPH_PATH);
  896         return (error);
  897 }
  898 
  899 /*
  900  * Receive data on a hook
  901  */
  902 static int
  903 ngs_rcvdata(hook_p hook, item_p item)
  904 {
  905         struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  906         struct ngpcb *const pcbp = priv->datasock;
  907         struct socket *so;
  908         struct sockaddr_ng *addr;
  909         char *addrbuf[NG_HOOKSIZ + 4];
  910         int addrlen;
  911         struct mbuf *m;
  912 
  913         NGI_GET_M(item, m);
  914         NG_FREE_ITEM(item);
  915         /* If there is no data socket, black-hole it */
  916         if (pcbp == NULL) {
  917                 NG_FREE_M(m);
  918                 return (0);
  919         }
  920         so = pcbp->ng_socket;
  921 
  922         /* Get the return address into a sockaddr. */
  923         addrlen = strlen(NG_HOOK_NAME(hook));   /* <= NG_HOOKSIZ - 1 */
  924         addr = (struct sockaddr_ng *) addrbuf;
  925         addr->sg_len = addrlen + 3;
  926         addr->sg_family = AF_NETGRAPH;
  927         bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen);
  928         addr->sg_data[addrlen] = '\0';
  929 
  930         /* Try to tell the socket which hook it came in on */
  931         if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) {
  932                 m_freem(m);
  933                 TRAP_ERROR;
  934                 return (ENOBUFS);
  935         }
  936         sorwakeup(so);
  937         return (0);
  938 }
  939 
  940 /*
  941  * Hook disconnection
  942  *
  943  * For this type, removal of the last link destroys the node
  944  * if the NOLINGER flag is set.
  945  */
  946 static int
  947 ngs_disconnect(hook_p hook)
  948 {
  949         node_p node = NG_HOOK_NODE(hook);
  950         struct ngsock *const priv = NG_NODE_PRIVATE(node);
  951 
  952         if ((priv->datasock)
  953         &&  (priv->datasock->ng_socket)) {
  954                 if (NG_NODE_NUMHOOKS(node) == 1) {
  955                         priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
  956                 } else {
  957                         priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
  958                 }
  959         }
  960 
  961         if ((priv->flags & NGS_FLAG_NOLINGER )
  962         && (NG_NODE_NUMHOOKS(node) == 0)
  963         && (NG_NODE_IS_VALID(node))) {
  964                 ng_rmnode_self(node);
  965         }
  966         return (0);
  967 }
  968 
  969 /*
  970  * Do local shutdown processing.
  971  * In this case, that involves making sure the socket
  972  * knows we should be shutting down.
  973  */
  974 static int
  975 ngs_shutdown(node_p node)
  976 {
  977         struct ngsock *const priv = NG_NODE_PRIVATE(node);
  978         struct ngpcb *const dpcbp = priv->datasock;
  979         struct ngpcb *const pcbp = priv->ctlsock;
  980 
  981         if (dpcbp != NULL) {
  982                 soisdisconnected(dpcbp->ng_socket);
  983                 dpcbp->sockdata = NULL;
  984                 priv->datasock = NULL;
  985                 priv->refs--;
  986         }
  987         if (pcbp != NULL) {
  988                 soisdisconnected(pcbp->ng_socket);
  989                 pcbp->sockdata = NULL;
  990                 priv->ctlsock = NULL;
  991                 priv->refs--;
  992         }
  993         NG_NODE_SET_PRIVATE(node, NULL);
  994         NG_NODE_UNREF(node);
  995         FREE(priv, M_NETGRAPH_SOCK);
  996         return (0);
  997 }
  998 
  999 static  int
 1000 dummy_disconnect(struct socket *so)
 1001 {
 1002         return (0);
 1003 }
 1004 /*
 1005  * Control and data socket type descriptors
 1006  */
 1007 
 1008 static struct pr_usrreqs ngc_usrreqs = {
 1009         NULL,                   /* abort */
 1010         pru_accept_notsupp,
 1011         ngc_attach,
 1012         ngc_bind,
 1013         ngc_connect,
 1014         pru_connect2_notsupp,
 1015         pru_control_notsupp,
 1016         ngc_detach,
 1017         dummy_disconnect,       /* disconnect */
 1018         pru_listen_notsupp,
 1019         NULL,                   /* setpeeraddr */
 1020         pru_rcvd_notsupp,
 1021         pru_rcvoob_notsupp,
 1022         ngc_send,
 1023         pru_sense_null,
 1024         NULL,                   /* shutdown */
 1025         ng_setsockaddr,
 1026         sosend,
 1027         soreceive,
 1028         sopoll,
 1029         pru_sosetlabel_null
 1030 };
 1031 
 1032 static struct pr_usrreqs ngd_usrreqs = {
 1033         NULL,                   /* abort */
 1034         pru_accept_notsupp,
 1035         ngd_attach,
 1036         NULL,                   /* bind */
 1037         ngd_connect,
 1038         pru_connect2_notsupp,
 1039         pru_control_notsupp,
 1040         ngd_detach,
 1041         dummy_disconnect,       /* disconnect */
 1042         pru_listen_notsupp,
 1043         NULL,                   /* setpeeraddr */
 1044         pru_rcvd_notsupp,
 1045         pru_rcvoob_notsupp,
 1046         ngd_send,
 1047         pru_sense_null,
 1048         NULL,                   /* shutdown */
 1049         ng_setsockaddr,
 1050         sosend,
 1051         soreceive,
 1052         sopoll,
 1053         pru_sosetlabel_null
 1054 };
 1055 
 1056 /*
 1057  * Definitions of protocols supported in the NETGRAPH domain.
 1058  */
 1059 
 1060 extern struct domain ngdomain;          /* stop compiler warnings */
 1061 
 1062 static struct protosw ngsw[] = {
 1063         {
 1064                 SOCK_DGRAM,             /* protocol type */
 1065                 &ngdomain,              /* backpointer to domain */
 1066                 NG_CONTROL,
 1067                 PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */,  /* flags */
 1068                 0, 0, 0, 0,             /* input, output, ctlinput, ctloutput */
 1069                 NULL,                   /* ousrreq */
 1070                 0, 0, 0, 0,             /* init, fasttimeo, slowtimo, drain */
 1071                 &ngc_usrreqs,           /* usrreq table (above) */
 1072                 /*{NULL}*/              /* pffh (protocol filter head?) */
 1073         },
 1074         {
 1075                 SOCK_DGRAM,             /* protocol type */
 1076                 &ngdomain,              /* backpointer to domain */
 1077                 NG_DATA,
 1078                 PR_ATOMIC | PR_ADDR,    /* flags */
 1079                 0, 0, 0, 0,             /* input, output, ctlinput, ctloutput */
 1080                 NULL,                   /* ousrreq() */
 1081                 0, 0, 0, 0,             /* init, fasttimeo, slowtimo, drain */
 1082                 &ngd_usrreqs,           /* usrreq table (above) */
 1083                 /*{NULL}*/              /* pffh (protocol filter head?) */
 1084         }
 1085 };
 1086 
 1087 struct domain ngdomain = {
 1088         AF_NETGRAPH,
 1089         "netgraph",
 1090         NULL,                                   /* init() */
 1091         NULL,                                   /* externalise() */
 1092         NULL,                                   /* dispose() */
 1093         ngsw,                                   /* protosw entry */
 1094         &ngsw[sizeof(ngsw) / sizeof(ngsw[0])],  /* Number of protosw entries */
 1095         NULL,                                   /* next domain in list */
 1096         NULL,                                   /* rtattach() */
 1097         0,                                      /* arg to rtattach in bits */
 1098         0                                       /* maxrtkey */
 1099 };
 1100 
 1101 /*
 1102  * Handle loading and unloading for this node type
 1103  * This is to handle auxiliary linkages (e.g protocol domain addition).
 1104  */
 1105 static int
 1106 ngs_mod_event(module_t mod, int event, void *data)
 1107 {
 1108         int error = 0;
 1109 
 1110         switch (event) {
 1111         case MOD_LOAD:
 1112                 /* Register protocol domain */
 1113                 net_add_domain(&ngdomain);
 1114                 break;
 1115         case MOD_UNLOAD:
 1116                 /* Insure there are no open netgraph sockets */
 1117                 if (!LIST_EMPTY(&ngsocklist)) {
 1118                         error = EBUSY;
 1119                         break;
 1120                 }
 1121 
 1122 #ifdef NOTYET
 1123                 if ((LIST_EMPTY(&ngsocklist)) && (typestruct.refs == 0)) {
 1124                 /* Unregister protocol domain XXX can't do this yet.. */
 1125                         if ((error = net_rm_domain(&ngdomain)) != 0)
 1126                                 break;
 1127                 } else
 1128 #endif
 1129                         error = EBUSY;
 1130                 break;
 1131         default:
 1132                 error = EOPNOTSUPP;
 1133                 break;
 1134         }
 1135         return (error);
 1136 }
 1137 
 1138 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, "");
 1139 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA");
 1140 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, "");
 1141 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL");
 1142 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, "");
 1143 

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