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  * $FreeBSD$
   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 void     ng_socket_free_priv(struct ngsock *priv);
  127 /*static int    ng_internalize(struct mbuf *m, struct thread *p); */
  128 
  129 static int      ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp);
  130 static int      ng_bind(struct sockaddr *nam, struct ngpcb *pcbp);
  131 
  132 static int      ngs_mod_event(module_t mod, int event, void *data);
  133 static int      ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg,
  134                         struct sockaddr_ng *addr);
  135 static void     ng_socket_item_applied(void *context, int error);
  136 
  137 /* Netgraph type descriptor */
  138 static struct ng_type typestruct = {
  139         .version =      NG_ABI_VERSION,
  140         .name =         NG_SOCKET_NODE_TYPE,
  141         .mod_event =    ngs_mod_event,
  142         .constructor =  ngs_constructor,
  143         .rcvmsg =       ngs_rcvmsg,
  144         .shutdown =     ngs_shutdown,
  145         .newhook =      ngs_newhook,
  146         .connect =      ngs_connect,
  147         .rcvdata =      ngs_rcvdata,
  148         .disconnect =   ngs_disconnect,
  149 };
  150 NETGRAPH_INIT_ORDERED(socket, &typestruct, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
  151 
  152 /* Buffer space */
  153 static u_long ngpdg_sendspace = 20 * 1024;      /* really max datagram size */
  154 SYSCTL_INT(_net_graph, OID_AUTO, maxdgram, CTLFLAG_RW,
  155     &ngpdg_sendspace , 0, "Maximum outgoing Netgraph datagram size");
  156 static u_long ngpdg_recvspace = 20 * 1024;
  157 SYSCTL_INT(_net_graph, OID_AUTO, recvspace, CTLFLAG_RW,
  158     &ngpdg_recvspace , 0, "Maximum space for incoming Netgraph datagrams");
  159 
  160 /* List of all sockets */
  161 static LIST_HEAD(, ngpcb) ngsocklist;
  162 
  163 static struct mtx       ngsocketlist_mtx;
  164 
  165 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb)
  166 
  167 /* If getting unexplained errors returned, set this to "kdb_enter("X"); */
  168 #ifndef TRAP_ERROR
  169 #define TRAP_ERROR
  170 #endif
  171 
  172 /***************************************************************
  173         Control sockets
  174 ***************************************************************/
  175 
  176 static int
  177 ngc_attach(struct socket *so, int proto, struct thread *td)
  178 {
  179         struct ngpcb *const pcbp = sotongpcb(so);
  180 
  181         if (suser(td))
  182                 return (EPERM);
  183         if (pcbp != NULL)
  184                 return (EISCONN);
  185         return (ng_attach_cntl(so));
  186 }
  187 
  188 static int
  189 ngc_detach(struct socket *so)
  190 {
  191         struct ngpcb *const pcbp = sotongpcb(so);
  192 
  193         if (pcbp == NULL)
  194                 return (EINVAL);
  195         ng_detach_common(pcbp, NG_CONTROL);
  196         return (0);
  197 }
  198 
  199 static int
  200 ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  201          struct mbuf *control, struct thread *td)
  202 {
  203         struct ngpcb *const pcbp = sotongpcb(so);
  204         struct ngsock *const priv = NG_NODE_PRIVATE(pcbp->sockdata->node);
  205         struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
  206         struct ng_mesg *msg;
  207         struct mbuf *m0;
  208         item_p item;
  209         char *path = NULL;
  210         int len, error = 0;
  211         struct ng_apply_info apply;
  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                 FREE(msg, M_NETGRAPH_MSG);
  260                 error = EINVAL;
  261                 goto release;
  262         }
  263 
  264         /*
  265          * Hack alert!
  266          * We look into the message and if it mkpeers a node of unknown type, we
  267          * try to load it. We need to do this now, in syscall thread, because if
  268          * message gets queued and applied later we will get panic.
  269          */
  270         if (msg->header.typecookie == NGM_GENERIC_COOKIE &&
  271             msg->header.cmd == NGM_MKPEER) {
  272                 struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data;
  273                 struct ng_type *type;
  274 
  275                 if ((type = ng_findtype(mkp->type)) == NULL) {
  276                         char filename[NG_TYPESIZ + 3];
  277                         linker_file_t lf;
  278 
  279                         /* Not found, try to load it as a loadable module. */
  280                         snprintf(filename, sizeof(filename), "ng_%s",
  281                             mkp->type);
  282                         mtx_lock(&Giant);
  283                         error = linker_load_module(NULL, filename, NULL, NULL,
  284                             &lf);
  285                         mtx_unlock(&Giant);
  286                         if (error != 0) {
  287                                 FREE(msg, M_NETGRAPH_MSG);
  288                                 goto release;
  289                         }
  290                         lf->userrefs++;
  291 
  292                         /* See if type has been loaded successfully. */
  293                         if ((type = ng_findtype(mkp->type)) == NULL) {
  294                                 FREE(msg, M_NETGRAPH_MSG);
  295                                 error =  ENXIO;
  296                                 goto release;
  297                         }
  298                 }
  299         }
  300 
  301         if ((item = ng_package_msg(msg, M_WAITOK)) == NULL) {
  302                 error = ENOMEM;
  303 #ifdef TRACE_MESSAGES
  304                 printf("ng_package_msg: err=%d\n", error);
  305 #endif
  306                 goto release;
  307         }
  308         if ((error = ng_address_path((pcbp->sockdata->node), item,
  309             path, 0)) != 0) {
  310 #ifdef TRACE_MESSAGES
  311                 printf("ng_address_path: errx=%d\n", error);
  312 #endif
  313                 goto release;
  314         }
  315 
  316 #ifdef TRACE_MESSAGES
  317         printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n",
  318                 item->el_dest->nd_ID,
  319                 msg->header.typecookie,
  320                 msg->header.cmd,
  321                 msg->header.cmdstr,
  322                 msg->header.flags,
  323                 msg->header.token,
  324                 item->el_dest->nd_type->name);
  325 #endif
  326         SAVE_LINE(item);
  327         /*
  328          * We do not want to return from syscall until the item
  329          * is processed by destination node. We register callback
  330          * on the item, which will update priv->error when item
  331          * was applied.
  332          * If ng_snd_item() has queued item, we sleep until
  333          * callback wakes us up.
  334          */
  335         bzero(&apply, sizeof(apply));
  336         apply.apply = ng_socket_item_applied;
  337         apply.context = priv;
  338         item->apply = &apply;
  339         priv->error = -1;
  340 
  341         error = ng_snd_item(item, 0);
  342 
  343         mtx_lock(&priv->mtx);
  344         if (priv->error == -1)
  345                 msleep(priv, &priv->mtx, 0, "ngsock", 0);
  346         mtx_unlock(&priv->mtx);
  347         KASSERT(priv->error != -1,
  348             ("ng_socket: priv->error wasn't updated"));
  349         error = priv->error;
  350 
  351 release:
  352         if (path != NULL)
  353                 FREE(path, M_NETGRAPH_PATH);
  354         if (control != NULL)
  355                 m_freem(control);
  356         if (m != NULL)
  357                 m_freem(m);
  358         return (error);
  359 }
  360 
  361 static int
  362 ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  363 {
  364         struct ngpcb *const pcbp = sotongpcb(so);
  365 
  366         if (pcbp == 0)
  367                 return (EINVAL);
  368         return (ng_bind(nam, pcbp));
  369 }
  370 
  371 static int
  372 ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  373 {
  374 printf(" program tried to connect control socket to remote node\n ");
  375         /*
  376          * At this time refuse to do this.. it used to
  377          * do something but it was undocumented and not used.
  378          */
  379         return (EINVAL);
  380 }
  381 
  382 /***************************************************************
  383         Data sockets
  384 ***************************************************************/
  385 
  386 static int
  387 ngd_attach(struct socket *so, int proto, struct thread *td)
  388 {
  389         struct ngpcb *const pcbp = sotongpcb(so);
  390 
  391         if (pcbp != NULL)
  392                 return (EISCONN);
  393         return (ng_attach_data(so));
  394 }
  395 
  396 static int
  397 ngd_detach(struct socket *so)
  398 {
  399         struct ngpcb *const pcbp = sotongpcb(so);
  400 
  401         if (pcbp == NULL)
  402                 return (EINVAL);
  403         ng_detach_common(pcbp, NG_DATA);
  404         return (0);
  405 }
  406 
  407 static int
  408 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  409          struct mbuf *control, struct thread *td)
  410 {
  411         struct ngpcb *const pcbp = sotongpcb(so);
  412         struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
  413         int     len, error;
  414         hook_p  hook = NULL;
  415         char    hookname[NG_HOOKSIZ];
  416 
  417         if ((pcbp == NULL) || (control != NULL)) {
  418                 error = EINVAL;
  419                 goto release;
  420         }
  421         if (pcbp->sockdata == NULL) {
  422                 error = ENOTCONN;
  423                 goto release;
  424         }
  425 
  426         if (sap == NULL)
  427                 len = 0;                /* Make compiler happy. */
  428         else
  429                 len = sap->sg_len - 2;
  430 
  431         /*
  432          * If the user used any of these ways to not specify an address
  433          * then handle specially.
  434          */
  435         if ((sap == NULL) || (len <= 0) || (*sap->sg_data == '\0')) {
  436                 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) {
  437                         error = EDESTADDRREQ;
  438                         goto release;
  439                 }
  440                 /*
  441                  * if exactly one hook exists, just use it.
  442                  * Special case to allow write(2) to work on an ng_socket.
  443                  */
  444                 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks);
  445         } else {
  446                 if (len >= NG_HOOKSIZ) {
  447                         error = EINVAL;
  448                         goto release;
  449                 }
  450 
  451                 /*
  452                  * chop off the sockaddr header, and make sure it's NUL
  453                  * terminated
  454                  */
  455                 bcopy(sap->sg_data, hookname, len);
  456                 hookname[len] = '\0';
  457 
  458                 /* Find the correct hook from 'hookname' */
  459                 LIST_FOREACH(hook, &pcbp->sockdata->node->nd_hooks, hk_hooks) {
  460                         if (strcmp(hookname, NG_HOOK_NAME(hook)) == 0) {
  461                                 break;
  462                         }
  463                 }
  464                 if (hook == NULL) {
  465                         error = EHOSTUNREACH;
  466                 }
  467         }
  468 
  469         /* Send data (OK if hook is NULL) */
  470         NG_SEND_DATA_ONLY(error, hook, m);      /* makes m NULL */
  471 
  472 release:
  473         if (control != NULL)
  474                 m_freem(control);
  475         if (m != NULL)
  476                 m_freem(m);
  477         return (error);
  478 }
  479 
  480 static int
  481 ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  482 {
  483         struct ngpcb *const pcbp = sotongpcb(so);
  484 
  485         if (pcbp == 0)
  486                 return (EINVAL);
  487         return (ng_connect_data(nam, pcbp));
  488 }
  489 
  490 /*
  491  * Used for both data and control sockets
  492  */
  493 static int
  494 ng_setsockaddr(struct socket *so, struct sockaddr **addr)
  495 {
  496         struct ngpcb *pcbp;
  497         struct sockaddr_ng *sg;
  498         int sg_len;
  499         int error = 0;
  500 
  501         /* Why isn't sg_data a `char[1]' ? :-( */
  502         sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1;
  503 
  504         pcbp = sotongpcb(so);
  505         if ((pcbp == NULL) || (pcbp->sockdata == NULL))
  506                 /* XXXGL: can this still happen? */
  507                 return (EINVAL);
  508 
  509         mtx_lock(&pcbp->sockdata->mtx);
  510         if (pcbp->sockdata->node != NULL) {
  511                 node_p node = pcbp->sockdata->node;
  512                 int namelen = 0;        /* silence compiler! */
  513 
  514                 if (NG_NODE_HAS_NAME(node))
  515                         sg_len += namelen = strlen(NG_NODE_NAME(node));
  516 
  517                 sg = malloc(sg_len, M_SONAME, M_WAITOK | M_ZERO);
  518 
  519                 if (NG_NODE_HAS_NAME(node))
  520                         bcopy(NG_NODE_NAME(node), sg->sg_data, namelen);
  521 
  522                 sg->sg_len = sg_len;
  523                 sg->sg_family = AF_NETGRAPH;
  524                 *addr = (struct sockaddr *)sg;
  525                 mtx_unlock(&pcbp->sockdata->mtx);
  526         } else {
  527                 mtx_unlock(&pcbp->sockdata->mtx);
  528                 error = EINVAL;
  529         }
  530 
  531         return (error);
  532 }
  533 
  534 /*
  535  * Attach a socket to it's protocol specific partner.
  536  * For a control socket, actually create a netgraph node and attach
  537  * to it as well.
  538  */
  539 
  540 static int
  541 ng_attach_cntl(struct socket *so)
  542 {
  543         struct ngsock *priv;
  544         struct ngpcb *pcbp;
  545         int error;
  546 
  547         /* Allocate node private info */
  548         MALLOC(priv, struct ngsock *,
  549             sizeof(*priv), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO);
  550         if (priv == NULL)
  551                 return (ENOMEM);
  552 
  553         /* Setup protocol control block */
  554         if ((error = ng_attach_common(so, NG_CONTROL)) != 0) {
  555                 FREE(priv, M_NETGRAPH_SOCK);
  556                 return (error);
  557         }
  558         pcbp = sotongpcb(so);
  559 
  560         /* Link the pcb the private data. */
  561         priv->ctlsock = pcbp;
  562         pcbp->sockdata = priv;
  563         priv->refs++;
  564 
  565         /* Initialize mutex. */
  566         mtx_init(&priv->mtx, "ng_socket", NULL, MTX_DEF);
  567 
  568         /* Make the generic node components */
  569         if ((error = ng_make_node_common(&typestruct, &priv->node)) != 0) {
  570                 FREE(priv, M_NETGRAPH_SOCK);
  571                 ng_detach_common(pcbp, NG_CONTROL);
  572                 return (error);
  573         }
  574 
  575         /* Link the node and the private data. */
  576         NG_NODE_SET_PRIVATE(priv->node, priv);
  577         NG_NODE_REF(priv->node);
  578         priv->refs++;
  579 
  580         return (0);
  581 }
  582 
  583 static int
  584 ng_attach_data(struct socket *so)
  585 {
  586         return(ng_attach_common(so, NG_DATA));
  587 }
  588 
  589 /*
  590  * Set up a socket protocol control block.
  591  * This code is shared between control and data sockets.
  592  */
  593 static int
  594 ng_attach_common(struct socket *so, int type)
  595 {
  596         struct ngpcb *pcbp;
  597         int error;
  598 
  599         /* Standard socket setup stuff */
  600         error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace);
  601         if (error)
  602                 return (error);
  603 
  604         /* Allocate the pcb */
  605         MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO);
  606         if (pcbp == NULL)
  607                 return (ENOMEM);
  608         pcbp->type = type;
  609 
  610         /* Link the pcb and the socket */
  611         so->so_pcb = (caddr_t) pcbp;
  612         pcbp->ng_socket = so;
  613 
  614         /* Add the socket to linked list */
  615         mtx_lock(&ngsocketlist_mtx);
  616         LIST_INSERT_HEAD(&ngsocklist, pcbp, socks);
  617         mtx_unlock(&ngsocketlist_mtx);
  618         return (0);
  619 }
  620 
  621 /*
  622  * Disassociate the socket from it's protocol specific
  623  * partner. If it's attached to a node's private data structure,
  624  * then unlink from that too. If we were the last socket attached to it,
  625  * then shut down the entire node. Shared code for control and data sockets.
  626  */
  627 static void
  628 ng_detach_common(struct ngpcb *pcbp, int which)
  629 {
  630         struct ngsock *priv = pcbp->sockdata;
  631 
  632         if (priv != NULL) {
  633                 mtx_lock(&priv->mtx);
  634 
  635                 switch (which) {
  636                 case NG_CONTROL:
  637                         priv->ctlsock = NULL;
  638                         break;
  639                 case NG_DATA:
  640                         priv->datasock = NULL;
  641                         break;
  642                 default:
  643                         panic(__func__);
  644                 }
  645                 pcbp->sockdata = NULL;
  646 
  647                 ng_socket_free_priv(priv);
  648         }
  649 
  650         pcbp->ng_socket->so_pcb = NULL;
  651         mtx_lock(&ngsocketlist_mtx);
  652         LIST_REMOVE(pcbp, socks);
  653         mtx_unlock(&ngsocketlist_mtx);
  654         FREE(pcbp, M_PCB);
  655 }
  656 
  657 /*
  658  * Remove a reference from node private data.
  659  */
  660 static void
  661 ng_socket_free_priv(struct ngsock *priv)
  662 {
  663         mtx_assert(&priv->mtx, MA_OWNED);
  664 
  665         priv->refs--;
  666 
  667         if (priv->refs == 0) {
  668                 mtx_destroy(&priv->mtx);
  669                 FREE(priv, M_NETGRAPH_SOCK);
  670                 return;
  671         }
  672 
  673         if ((priv->refs == 1) && (priv->node != NULL)) {
  674                 node_p node = priv->node;
  675 
  676                 priv->node = NULL;
  677                 mtx_unlock(&priv->mtx);
  678                 NG_NODE_UNREF(node);
  679                 ng_rmnode_self(node);
  680         } else
  681                 mtx_unlock(&priv->mtx);
  682 }
  683 
  684 #ifdef NOTYET
  685 /*
  686  * File descriptors can be passed into an AF_NETGRAPH socket.
  687  * Note, that file descriptors cannot be passed OUT.
  688  * Only character device descriptors are accepted.
  689  * Character devices are useful to connect a graph to a device,
  690  * which after all is the purpose of this whole system.
  691  */
  692 static int
  693 ng_internalize(struct mbuf *control, struct thread *td)
  694 {
  695         const struct cmsghdr *cm = mtod(control, const struct cmsghdr *);
  696         struct file *fp;
  697         struct vnode *vn;
  698         int oldfds;
  699         int fd;
  700 
  701         if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET ||
  702             cm->cmsg_len != control->m_len) {
  703                 TRAP_ERROR;
  704                 return (EINVAL);
  705         }
  706 
  707         /* Check there is only one FD. XXX what would more than one signify? */
  708         oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int);
  709         if (oldfds != 1) {
  710                 TRAP_ERROR;
  711                 return (EINVAL);
  712         }
  713 
  714         /* Check that the FD given is legit. and change it to a pointer to a
  715          * struct file. */
  716         fd = CMSG_DATA(cm);
  717         if ((error = fget(td, fd, &fp)) != 0)
  718                 return (error);
  719 
  720         /* Depending on what kind of resource it is, act differently. For
  721          * devices, we treat it as a file. For an AF_NETGRAPH socket,
  722          * shortcut straight to the node. */
  723         switch (fp->f_type) {
  724         case DTYPE_VNODE:
  725                 vn = fp->f_data;
  726                 if (vn && (vn->v_type == VCHR)) {
  727                         /* for a VCHR, actually reference the FILE */
  728                         fp->f_count++;
  729                         /* XXX then what :) */
  730                         /* how to pass on to other modules? */
  731                 } else {
  732                         fdrop(fp, td);
  733                         TRAP_ERROR;
  734                         return (EINVAL);
  735                 }
  736                 break;
  737         default:
  738                 fdrop(fp, td);
  739                 TRAP_ERROR;
  740                 return (EINVAL);
  741         }
  742         fdrop(fp, td);
  743         return (0);
  744 }
  745 #endif  /* NOTYET */
  746 
  747 /*
  748  * Connect the data socket to a named control socket node.
  749  */
  750 static int
  751 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp)
  752 {
  753         struct sockaddr_ng *sap;
  754         node_p farnode;
  755         struct ngsock *priv;
  756         int error;
  757         item_p item;
  758 
  759         /* If we are already connected, don't do it again */
  760         if (pcbp->sockdata != NULL)
  761                 return (EISCONN);
  762 
  763         /* Find the target (victim) and check it doesn't already have a data
  764          * socket. Also check it is a 'socket' type node.
  765          * Use ng_package_data() and address_path() to do this.
  766          */
  767 
  768         sap = (struct sockaddr_ng *) nam;
  769         /* The item will hold the node reference */
  770         item = ng_package_data(NULL, NG_WAITOK);
  771         if (item == NULL) {
  772                 return (ENOMEM);
  773         }
  774         if ((error = ng_address_path(NULL, item,  sap->sg_data, 0)))
  775                 return (error); /* item is freed on failure */
  776 
  777         /*
  778          * Extract node from item and free item. Remember we now have
  779          * a reference on the node. The item holds it for us.
  780          * when we free the item we release the reference.
  781          */
  782         farnode = item->el_dest; /* shortcut */
  783         if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) {
  784                 NG_FREE_ITEM(item); /* drop the reference to the node */
  785                 return (EINVAL);
  786         }
  787         priv = NG_NODE_PRIVATE(farnode);
  788         if (priv->datasock != NULL) {
  789                 NG_FREE_ITEM(item);     /* drop the reference to the node */
  790                 return (EADDRINUSE);
  791         }
  792 
  793         /*
  794          * Link the PCB and the private data struct. and note the extra
  795          * reference. Drop the extra reference on the node.
  796          */
  797         mtx_lock(&priv->mtx);
  798         priv->datasock = pcbp;
  799         pcbp->sockdata = priv;
  800         priv->refs++;
  801         mtx_unlock(&priv->mtx);
  802         NG_FREE_ITEM(item);     /* drop the reference to the node */
  803         return (0);
  804 }
  805 
  806 /*
  807  * Binding a socket means giving the corresponding node a name
  808  */
  809 static int
  810 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp)
  811 {
  812         struct ngsock *const priv = pcbp->sockdata;
  813         struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam;
  814 
  815         if (priv == NULL) {
  816                 TRAP_ERROR;
  817                 return (EINVAL);
  818         }
  819         if ((sap->sg_len < 4)
  820         ||  (sap->sg_len > (NG_NODESIZ + 2))
  821         ||  (sap->sg_data[0] == '\0')
  822         ||  (sap->sg_data[sap->sg_len - 3] != '\0')) {
  823                 TRAP_ERROR;
  824                 return (EINVAL);
  825         }
  826         return (ng_name_node(priv->node, sap->sg_data));
  827 }
  828 
  829 /*
  830  * Take a message and pass it up to the control socket associated
  831  * with the node.
  832  */
  833 static int
  834 ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr)
  835 {
  836         struct socket *const so = pcbp->ng_socket;
  837         struct mbuf *mdata;
  838         int msglen;
  839         int error = 0;
  840 
  841         /* Copy the message itself into an mbuf chain */
  842         msglen = sizeof(struct ng_mesg) + msg->header.arglen;
  843         mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL);
  844 
  845         /* Here we free the message, as we are the end of the line.
  846          * We need to do that regardless of whether we got mbufs. */
  847         NG_FREE_MSG(msg);
  848 
  849         if (mdata == NULL) {
  850                 TRAP_ERROR;
  851                 return (ENOBUFS);
  852         }
  853 
  854         /* Send it up to the socket */
  855         if (sbappendaddr(&so->so_rcv,
  856             (struct sockaddr *) addr, mdata, NULL) == 0) {
  857                 TRAP_ERROR;
  858                 m_freem(mdata);
  859                 return (ENOBUFS);
  860         }
  861         sorwakeup(so);
  862         return (error);
  863 }
  864 
  865 /***************************************************************
  866         Netgraph node
  867 ***************************************************************/
  868 
  869 /*
  870  * You can only create new nodes from the socket end of things.
  871  */
  872 static int
  873 ngs_constructor(node_p nodep)
  874 {
  875         return (EINVAL);
  876 }
  877 
  878 /*
  879  * We allow any hook to be connected to the node.
  880  * There is no per-hook private information though.
  881  */
  882 static int
  883 ngs_newhook(node_p node, hook_p hook, const char *name)
  884 {
  885         NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node));
  886         return (0);
  887 }
  888 
  889 /* 
  890  * if only one hook, allow read(2) and write(2) to work.
  891  */
  892 static int
  893 ngs_connect(hook_p hook)
  894 {
  895         node_p node = NG_HOOK_NODE(hook);
  896         struct ngsock *priv = NG_NODE_PRIVATE(node);
  897 
  898         if ((priv->datasock)
  899         &&  (priv->datasock->ng_socket)) {
  900                 if (NG_NODE_NUMHOOKS(node) == 1) {
  901                         priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
  902                 } else {
  903                         priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
  904                 }
  905         }
  906         return (0);
  907 }
  908 
  909 /*
  910  * Incoming messages get passed up to the control socket.
  911  * Unless they are for us specifically (socket_type)
  912  */
  913 static int
  914 ngs_rcvmsg(node_p node, item_p item, hook_p lasthook)
  915 {
  916         struct ngsock *const priv = NG_NODE_PRIVATE(node);
  917         struct ngpcb *const pcbp = priv->ctlsock;
  918         struct sockaddr_ng *addr;
  919         int addrlen;
  920         int error = 0;
  921         struct  ng_mesg *msg;
  922         ng_ID_t retaddr = NGI_RETADDR(item);
  923         char    retabuf[32];
  924 
  925         NGI_GET_MSG(item, msg);
  926         NG_FREE_ITEM(item); /* we have all we need */
  927 
  928         /* Only allow mesgs to be passed if we have the control socket.
  929          * Data sockets can only support the generic messages. */
  930         if (pcbp == NULL) {
  931                 TRAP_ERROR;
  932                 return (EINVAL);
  933         }
  934 
  935 #ifdef TRACE_MESSAGES
  936         printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n",
  937                 retaddr,
  938                 msg->header.typecookie,
  939                 msg->header.cmd,
  940                 msg->header.cmdstr,
  941                 msg->header.flags,
  942                 msg->header.token);
  943 #endif
  944 
  945         if (msg->header.typecookie == NGM_SOCKET_COOKIE) {
  946                 switch (msg->header.cmd) {
  947                 case NGM_SOCK_CMD_NOLINGER:
  948                         priv->flags |= NGS_FLAG_NOLINGER;
  949                         break;
  950                 case NGM_SOCK_CMD_LINGER:
  951                         priv->flags &= ~NGS_FLAG_NOLINGER;
  952                         break;
  953                 default:
  954                         error = EINVAL;         /* unknown command */
  955                 }
  956                 /* Free the message and return */
  957                 NG_FREE_MSG(msg);
  958                 return(error);
  959 
  960         }
  961         /* Get the return address into a sockaddr */
  962         sprintf(retabuf,"[%x]:", retaddr);
  963         addrlen = strlen(retabuf);
  964         MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH_PATH, M_NOWAIT);
  965         if (addr == NULL) {
  966                 TRAP_ERROR;
  967                 return (ENOMEM);
  968         }
  969         addr->sg_len = addrlen + 3;
  970         addr->sg_family = AF_NETGRAPH;
  971         bcopy(retabuf, addr->sg_data, addrlen);
  972         addr->sg_data[addrlen] = '\0';
  973 
  974         /* Send it up */
  975         error = ship_msg(pcbp, msg, addr);
  976         FREE(addr, M_NETGRAPH_PATH);
  977         return (error);
  978 }
  979 
  980 /*
  981  * Receive data on a hook
  982  */
  983 static int
  984 ngs_rcvdata(hook_p hook, item_p item)
  985 {
  986         struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  987         struct ngpcb *const pcbp = priv->datasock;
  988         struct socket *so;
  989         struct sockaddr_ng *addr;
  990         char *addrbuf[NG_HOOKSIZ + 4];
  991         int addrlen;
  992         struct mbuf *m;
  993 
  994         NGI_GET_M(item, m);
  995         NG_FREE_ITEM(item);
  996         /* If there is no data socket, black-hole it */
  997         if (pcbp == NULL) {
  998                 NG_FREE_M(m);
  999                 return (0);
 1000         }
 1001         so = pcbp->ng_socket;
 1002 
 1003         /* Get the return address into a sockaddr. */
 1004         addrlen = strlen(NG_HOOK_NAME(hook));   /* <= NG_HOOKSIZ - 1 */
 1005         addr = (struct sockaddr_ng *) addrbuf;
 1006         addr->sg_len = addrlen + 3;
 1007         addr->sg_family = AF_NETGRAPH;
 1008         bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen);
 1009         addr->sg_data[addrlen] = '\0';
 1010 
 1011         /* Try to tell the socket which hook it came in on */
 1012         if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) {
 1013                 m_freem(m);
 1014                 TRAP_ERROR;
 1015                 return (ENOBUFS);
 1016         }
 1017         sorwakeup(so);
 1018         return (0);
 1019 }
 1020 
 1021 /*
 1022  * Hook disconnection
 1023  *
 1024  * For this type, removal of the last link destroys the node
 1025  * if the NOLINGER flag is set.
 1026  */
 1027 static int
 1028 ngs_disconnect(hook_p hook)
 1029 {
 1030         node_p node = NG_HOOK_NODE(hook);
 1031         struct ngsock *const priv = NG_NODE_PRIVATE(node);
 1032 
 1033         if ((priv->datasock)
 1034         &&  (priv->datasock->ng_socket)) {
 1035                 if (NG_NODE_NUMHOOKS(node) == 1) {
 1036                         priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
 1037                 } else {
 1038                         priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
 1039                 }
 1040         }
 1041 
 1042         if ((priv->flags & NGS_FLAG_NOLINGER )
 1043         && (NG_NODE_NUMHOOKS(node) == 0)
 1044         && (NG_NODE_IS_VALID(node))) {
 1045                 ng_rmnode_self(node);
 1046         }
 1047         return (0);
 1048 }
 1049 
 1050 /*
 1051  * Do local shutdown processing.
 1052  * In this case, that involves making sure the socket
 1053  * knows we should be shutting down.
 1054  */
 1055 static int
 1056 ngs_shutdown(node_p node)
 1057 {
 1058         struct ngsock *const priv = NG_NODE_PRIVATE(node);
 1059         struct ngpcb *const dpcbp = priv->datasock;
 1060         struct ngpcb *const pcbp = priv->ctlsock;
 1061 
 1062         if (dpcbp != NULL)
 1063                 soisdisconnected(dpcbp->ng_socket);
 1064 
 1065         if (pcbp != NULL)
 1066                 soisdisconnected(pcbp->ng_socket);
 1067 
 1068         mtx_lock(&priv->mtx);
 1069         priv->node = NULL;
 1070         NG_NODE_SET_PRIVATE(node, NULL);
 1071         ng_socket_free_priv(priv);
 1072 
 1073         NG_NODE_UNREF(node);
 1074         return (0);
 1075 }
 1076 
 1077 static void
 1078 ng_socket_item_applied(void *context, int error)
 1079 {
 1080         struct ngsock *const priv = (struct ngsock *)context;
 1081 
 1082         mtx_lock(&priv->mtx);
 1083         priv->error = error;
 1084         wakeup(priv);
 1085         mtx_unlock(&priv->mtx);
 1086 
 1087 }
 1088 
 1089 static  int
 1090 dummy_disconnect(struct socket *so)
 1091 {
 1092         return (0);
 1093 }
 1094 /*
 1095  * Control and data socket type descriptors
 1096  */
 1097 
 1098 static struct pr_usrreqs ngc_usrreqs = {
 1099         .pru_abort =            NULL,
 1100         .pru_attach =           ngc_attach,
 1101         .pru_bind =             ngc_bind,
 1102         .pru_connect =          ngc_connect,
 1103         .pru_detach =           ngc_detach,
 1104         .pru_disconnect =       dummy_disconnect,
 1105         .pru_peeraddr =         NULL,
 1106         .pru_send =             ngc_send,
 1107         .pru_shutdown =         NULL,
 1108         .pru_sockaddr =         ng_setsockaddr,
 1109 };
 1110 
 1111 static struct pr_usrreqs ngd_usrreqs = {
 1112         .pru_abort =            NULL,
 1113         .pru_attach =           ngd_attach,
 1114         .pru_bind =             NULL,
 1115         .pru_connect =          ngd_connect,
 1116         .pru_detach =           ngd_detach,
 1117         .pru_disconnect =       dummy_disconnect,
 1118         .pru_peeraddr =         NULL,
 1119         .pru_send =             ngd_send,
 1120         .pru_shutdown =         NULL,
 1121         .pru_sockaddr =         ng_setsockaddr,
 1122 };
 1123 
 1124 /*
 1125  * Definitions of protocols supported in the NETGRAPH domain.
 1126  */
 1127 
 1128 extern struct domain ngdomain;          /* stop compiler warnings */
 1129 
 1130 static struct protosw ngsw[] = {
 1131 {
 1132         .pr_type =              SOCK_DGRAM,
 1133         .pr_domain =            &ngdomain,
 1134         .pr_protocol =          NG_CONTROL,
 1135         .pr_flags =             PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */,
 1136         .pr_usrreqs =           &ngc_usrreqs
 1137 },
 1138 {
 1139         .pr_type =              SOCK_DGRAM,
 1140         .pr_domain =            &ngdomain,
 1141         .pr_protocol =          NG_DATA,
 1142         .pr_flags =             PR_ATOMIC | PR_ADDR,
 1143         .pr_usrreqs =           &ngd_usrreqs
 1144 }
 1145 };
 1146 
 1147 struct domain ngdomain = {
 1148         .dom_family =           AF_NETGRAPH,
 1149         .dom_name =             "netgraph",
 1150         .dom_protosw =          ngsw,
 1151         .dom_protoswNPROTOSW =  &ngsw[sizeof(ngsw) / sizeof(ngsw[0])]
 1152 };
 1153 
 1154 /*
 1155  * Handle loading and unloading for this node type
 1156  * This is to handle auxiliary linkages (e.g protocol domain addition).
 1157  */
 1158 static int
 1159 ngs_mod_event(module_t mod, int event, void *data)
 1160 {
 1161         int error = 0;
 1162 
 1163         switch (event) {
 1164         case MOD_LOAD:
 1165                 mtx_init(&ngsocketlist_mtx, "ng_socketlist", NULL, MTX_DEF);
 1166                 /* Register protocol domain */
 1167                 net_add_domain(&ngdomain);
 1168                 break;
 1169         case MOD_UNLOAD:
 1170                 /* Insure there are no open netgraph sockets */
 1171                 if (!LIST_EMPTY(&ngsocklist)) {
 1172                         error = EBUSY;
 1173                         break;
 1174                 }
 1175 
 1176 #ifdef NOTYET
 1177                 if ((LIST_EMPTY(&ngsocklist)) && (typestruct.refs == 0)) {
 1178                 /* Unregister protocol domain XXX can't do this yet.. */
 1179                         if ((error = net_rm_domain(&ngdomain)) != 0)
 1180                                 break;
 1181                         mtx_destroy(&ngsocketlist_mtx);
 1182                 } else
 1183 #endif
 1184                         error = EBUSY;
 1185                 break;
 1186         default:
 1187                 error = EOPNOTSUPP;
 1188                 break;
 1189         }
 1190         return (error);
 1191 }
 1192 
 1193 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, "");
 1194 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA");
 1195 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, "");
 1196 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL");
 1197 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, "");
 1198 

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