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 /*
    3  * ng_socket.c
    4  *
    5  * Copyright (c) 1996-1999 Whistle Communications, Inc.
    6  * All rights reserved.
    7  *
    8  * Subject to the following obligations and disclaimer of warranty, use and
    9  * redistribution of this software, in source or object code forms, with or
   10  * without modifications are expressly permitted by Whistle Communications;
   11  * provided, however, that:
   12  * 1. Any and all reproductions of the source or object code must include the
   13  *    copyright notice above and the following disclaimer of warranties; and
   14  * 2. No rights are granted, in any manner or form, to use Whistle
   15  *    Communications, Inc. trademarks, including the mark "WHISTLE
   16  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   17  *    such appears in the above copyright notice or in the software.
   18  *
   19  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   20  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   21  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   22  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   23  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   24  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   25  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   26  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   27  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   28  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   29  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   30  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   31  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   34  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   35  * OF SUCH DAMAGE.
   36  *
   37  * Author: Julian Elischer <julian@freebsd.org>
   38  *
   39  * $FreeBSD: releng/5.1/sys/netgraph/ng_socket.c 111119 2003-02-19 05:47:46Z imp $
   40  * $Whistle: ng_socket.c,v 1.28 1999/11/01 09:24:52 julian Exp $
   41  */
   42 
   43 /*
   44  * Netgraph socket nodes
   45  *
   46  * There are two types of netgraph sockets, control and data.
   47  * Control sockets have a netgraph node, but data sockets are
   48  * parasitic on control sockets, and have no node of their own.
   49  */
   50 
   51 #include <sys/param.h>
   52 #include <sys/domain.h>
   53 #include <sys/errno.h>
   54 #include <sys/kernel.h>
   55 #include <sys/lock.h>
   56 #include <sys/malloc.h>
   57 #include <sys/mbuf.h>
   58 #include <sys/protosw.h>
   59 #include <sys/queue.h>
   60 #include <sys/signalvar.h>
   61 #include <sys/socket.h>
   62 #include <sys/socketvar.h>
   63 #include <sys/sx.h>
   64 #include <sys/sysctl.h>
   65 #include <sys/systm.h>
   66 #ifdef NOTYET
   67 #include <sys/vnode.h>
   68 #endif
   69 #include <netgraph/ng_message.h>
   70 #include <netgraph/netgraph.h>
   71 #include <netgraph/ng_socketvar.h>
   72 #include <netgraph/ng_socket.h>
   73 
   74 #ifdef NG_SEPARATE_MALLOC
   75 MALLOC_DEFINE(M_NETGRAPH_PATH, "netgraph_path", "netgraph path info ");
   76 MALLOC_DEFINE(M_NETGRAPH_SOCK, "netgraph_sock", "netgraph socket info ");
   77 #else
   78 #define M_NETGRAPH_PATH M_NETGRAPH
   79 #define M_NETGRAPH_SOCK M_NETGRAPH
   80 #endif
   81 
   82 /*
   83  * It's Ascii-art time!
   84  *   +-------------+   +-------------+
   85  *   |socket  (ctl)|   |socket (data)|
   86  *   +-------------+   +-------------+
   87  *          ^                 ^
   88  *          |                 |
   89  *          v                 v
   90  *    +-----------+     +-----------+
   91  *    |pcb   (ctl)|     |pcb  (data)|
   92  *    +-----------+     +-----------+
   93  *          ^                 ^
   94  *          |                 |
   95  *          v                 v
   96  *      +--------------------------+
   97  *      |   Socket type private    |
   98  *      |       data               |
   99  *      +--------------------------+
  100  *                   ^
  101  *                   |
  102  *                   v
  103  *           +----------------+
  104  *           | struct ng_node |
  105  *           +----------------+
  106  */
  107 
  108 /* Netgraph node methods */
  109 static ng_constructor_t ngs_constructor;
  110 static ng_rcvmsg_t      ngs_rcvmsg;
  111 static ng_shutdown_t    ngs_shutdown;
  112 static ng_newhook_t     ngs_newhook;
  113 static ng_connect_t     ngs_connect;
  114 static ng_rcvdata_t     ngs_rcvdata;
  115 static ng_disconnect_t  ngs_disconnect;
  116 
  117 /* Internal methods */
  118 static int      ng_attach_data(struct socket *so);
  119 static int      ng_attach_cntl(struct socket *so);
  120 static int      ng_attach_common(struct socket *so, int type);
  121 static void     ng_detach_common(struct ngpcb *pcbp, int type);
  122 /*static int    ng_internalize(struct mbuf *m, struct thread *p); */
  123 
  124 static int      ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp);
  125 static int      ng_bind(struct sockaddr *nam, struct ngpcb *pcbp);
  126 
  127 static int      ngs_mod_event(module_t mod, int event, void *data);
  128 static int      ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg,
  129                         struct sockaddr_ng *addr);
  130 
  131 /* Netgraph type descriptor */
  132 static struct ng_type typestruct = {
  133         NG_ABI_VERSION,
  134         NG_SOCKET_NODE_TYPE,
  135         ngs_mod_event,
  136         ngs_constructor,
  137         ngs_rcvmsg,
  138         ngs_shutdown,
  139         ngs_newhook,
  140         NULL,
  141         ngs_connect,
  142         ngs_rcvdata,
  143         ngs_disconnect,
  144         NULL
  145 };
  146 NETGRAPH_INIT(socket, &typestruct);
  147 
  148 /* Buffer space */
  149 static u_long ngpdg_sendspace = 20 * 1024;      /* really max datagram size */
  150 static u_long ngpdg_recvspace = 20 * 1024;
  151 
  152 /* List of all sockets */
  153 static LIST_HEAD(, ngpcb) ngsocklist;
  154 
  155 #define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb)
  156 
  157 /* If getting unexplained errors returned, set this to "Debugger("X"); */
  158 #ifndef TRAP_ERROR
  159 #define TRAP_ERROR
  160 #endif
  161 
  162 /***************************************************************
  163         Control sockets
  164 ***************************************************************/
  165 
  166 static int
  167 ngc_attach(struct socket *so, int proto, struct thread *td)
  168 {
  169         struct ngpcb *const pcbp = sotongpcb(so);
  170 
  171         if (suser(td))
  172                 return (EPERM);
  173         if (pcbp != NULL)
  174                 return (EISCONN);
  175         return (ng_attach_cntl(so));
  176 }
  177 
  178 static int
  179 ngc_detach(struct socket *so)
  180 {
  181         struct ngpcb *const pcbp = sotongpcb(so);
  182 
  183         if (pcbp == NULL)
  184                 return (EINVAL);
  185         ng_detach_common(pcbp, NG_CONTROL);
  186         return (0);
  187 }
  188 
  189 static int
  190 ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  191          struct mbuf *control, struct thread *td)
  192 {
  193         struct ngpcb *const pcbp = sotongpcb(so);
  194         struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
  195         struct ng_mesg *msg;
  196         struct mbuf *m0;
  197         char *path = NULL;
  198         int len, error = 0;
  199 
  200         if (pcbp == NULL) {
  201                 error = EINVAL;
  202                 goto release;
  203         }
  204 #ifdef  NOTYET
  205         if (control && (error = ng_internalize(control, td))) {
  206                 if (pcbp->sockdata == NULL) {
  207                         error = ENOTCONN;
  208                         goto release;
  209                 }
  210         }
  211 #else   /* NOTYET */
  212         if (control) {
  213                 error = EINVAL;
  214                 goto release;
  215         }
  216 #endif  /* NOTYET */
  217 
  218         /* Require destination as there may be >= 1 hooks on this node */
  219         if (addr == NULL) {
  220                 error = EDESTADDRREQ;
  221                 goto release;
  222         }
  223 
  224         /* Allocate an expendable buffer for the path, chop off
  225          * the sockaddr header, and make sure it's NUL terminated */
  226         len = sap->sg_len - 2;
  227         MALLOC(path, char *, len + 1, M_NETGRAPH_PATH, M_WAITOK);
  228         if (path == NULL) {
  229                 error = ENOMEM;
  230                 goto release;
  231         }
  232         bcopy(sap->sg_data, path, len);
  233         path[len] = '\0';
  234 
  235         /* Move the actual message out of mbufs into a linear buffer.
  236          * Start by adding up the size of the data. (could use mh_len?) */
  237         for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next)
  238                 len += m0->m_len;
  239 
  240         /* Move the data into a linear buffer as well. Messages are not
  241          * delivered in mbufs. */
  242         MALLOC(msg, struct ng_mesg *, len + 1, M_NETGRAPH_MSG, M_WAITOK);
  243         if (msg == NULL) {
  244                 error = ENOMEM;
  245                 goto release;
  246         }
  247         m_copydata(m, 0, len, (char *)msg);
  248 
  249 #ifdef TRACE_MESSAGES
  250         do {                                                            
  251                 item_p item;                                            
  252                 if ((item = ng_package_msg(msg)) == NULL) {             
  253                         (msg) = NULL;                           
  254                         (error) = ENOMEM;                               
  255 printf("err=%d\n",error);
  256                         break;                                          
  257                 }                                                       
  258                 if (((error) = ng_address_path((pcbp->sockdata->node), (item),          
  259                                         (path), (NULL))) == 0) {        
  260 printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n",
  261 item->el_dest->nd_ID,
  262 msg->header.typecookie,
  263 msg->header.cmd,
  264 msg->header.cmdstr,
  265 msg->header.flags,
  266 msg->header.token,
  267 item->el_dest->nd_type->name); 
  268                         SAVE_LINE(item);                        
  269                         (error) = ng_snd_item((item), 0);               
  270                 }                                                       
  271 else {
  272 printf("errx=%d\n",error);
  273 }
  274                 (msg) = NULL;                                           
  275         } while (0);
  276 
  277 #else
  278         /* The callee will free the msg when done. The path is our business. */
  279         NG_SEND_MSG_PATH(error, pcbp->sockdata->node, msg, path, 0);
  280 #endif
  281 release:
  282         if (path != NULL)
  283                 FREE(path, M_NETGRAPH_PATH);
  284         if (control != NULL)
  285                 m_freem(control);
  286         if (m != NULL)
  287                 m_freem(m);
  288         return (error);
  289 }
  290 
  291 static int
  292 ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  293 {
  294         struct ngpcb *const pcbp = sotongpcb(so);
  295 
  296         if (pcbp == 0)
  297                 return (EINVAL);
  298         return (ng_bind(nam, pcbp));
  299 }
  300 
  301 static int
  302 ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  303 {
  304 printf(" program tried to connect control socket to remote node\n ");
  305         /*
  306          * At this time refuse to do this.. it used to
  307          * do something but it was undocumented and not used.
  308          */
  309         return (EINVAL);
  310 }
  311 
  312 /***************************************************************
  313         Data sockets
  314 ***************************************************************/
  315 
  316 static int
  317 ngd_attach(struct socket *so, int proto, struct thread *td)
  318 {
  319         struct ngpcb *const pcbp = sotongpcb(so);
  320 
  321         if (pcbp != NULL)
  322                 return (EISCONN);
  323         return (ng_attach_data(so));
  324 }
  325 
  326 static int
  327 ngd_detach(struct socket *so)
  328 {
  329         struct ngpcb *const pcbp = sotongpcb(so);
  330 
  331         if (pcbp == NULL)
  332                 return (EINVAL);
  333         ng_detach_common(pcbp, NG_DATA);
  334         return (0);
  335 }
  336 
  337 static int
  338 ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
  339          struct mbuf *control, struct thread *td)
  340 {
  341         struct ngpcb *const pcbp = sotongpcb(so);
  342         struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
  343         int     len, error;
  344         hook_p  hook = NULL;
  345         char    hookname[NG_HOOKLEN + 1];
  346 
  347         if ((pcbp == NULL) || (control != NULL)) {
  348                 error = EINVAL;
  349                 goto release;
  350         }
  351         if (pcbp->sockdata == NULL) {
  352                 error = ENOTCONN;
  353                 goto release;
  354         }
  355         /*
  356          * If the user used any of these ways to not specify an address
  357          * then handle specially.
  358          */
  359         if ((sap == NULL)
  360             || ((len = sap->sg_len - 2) <= 0)
  361             || (*sap->sg_data == '\0')) {
  362                 if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) {
  363                         error = EDESTADDRREQ;
  364                         goto release;
  365                 }
  366                 /*
  367                  * if exactly one hook exists, just use it.
  368                  * Special case to allow write(2) to work on an ng_socket.
  369                  */
  370                 hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks);
  371         } else {
  372                 if (len > NG_HOOKLEN) {
  373                         error = EINVAL;
  374                         goto release;
  375                 }
  376 
  377                 /*
  378                  * chop off the sockaddr header, and make sure it's NUL
  379                  * terminated
  380                  */
  381                 bcopy(sap->sg_data, hookname, len);
  382                 hookname[len] = '\0';
  383 
  384                 /* Find the correct hook from 'hookname' */
  385                 LIST_FOREACH(hook, &pcbp->sockdata->node->nd_hooks, hk_hooks) {
  386                         if (strcmp(hookname, NG_HOOK_NAME(hook)) == 0) {
  387                                 break;
  388                         }
  389                 }
  390                 if (hook == NULL) {
  391                         error = EHOSTUNREACH;
  392                 }
  393         }
  394 
  395         /* Send data (OK if hook is NULL) */
  396         NG_SEND_DATA_ONLY(error, hook, m);      /* makes m NULL */
  397 
  398 release:
  399         if (control != NULL)
  400                 m_freem(control);
  401         if (m != NULL)
  402                 m_freem(m);
  403         return (error);
  404 }
  405 
  406 static int
  407 ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  408 {
  409         struct ngpcb *const pcbp = sotongpcb(so);
  410 
  411         if (pcbp == 0)
  412                 return (EINVAL);
  413         return (ng_connect_data(nam, pcbp));
  414 }
  415 
  416 /*
  417  * Used for both data and control sockets
  418  */
  419 static int
  420 ng_setsockaddr(struct socket *so, struct sockaddr **addr)
  421 {
  422         struct ngpcb *pcbp;
  423         struct sockaddr_ng *sg;
  424         int sg_len, namelen, s;
  425 
  426         /* Why isn't sg_data a `char[1]' ? :-( */
  427         sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1;
  428 
  429         s = splnet();
  430         pcbp = sotongpcb(so);
  431         if ((pcbp == NULL) || (pcbp->sockdata == NULL)) {
  432                 splx(s);
  433                 return (EINVAL);
  434         }
  435 
  436         namelen = 0;            /* silence compiler ! */
  437         if ( NG_NODE_HAS_NAME(pcbp->sockdata->node))
  438                 sg_len += namelen = strlen(NG_NODE_NAME(pcbp->sockdata->node));
  439 
  440         MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK | M_ZERO);
  441 
  442         if (NG_NODE_HAS_NAME(pcbp->sockdata->node))
  443                 bcopy(NG_NODE_NAME(pcbp->sockdata->node), sg->sg_data, namelen);
  444         splx(s);
  445 
  446         sg->sg_len = sg_len;
  447         sg->sg_family = AF_NETGRAPH;
  448         *addr = (struct sockaddr *)sg;
  449 
  450         return (0);
  451 }
  452 
  453 /*
  454  * Attach a socket to it's protocol specific partner.
  455  * For a control socket, actually create a netgraph node and attach
  456  * to it as well.
  457  */
  458 
  459 static int
  460 ng_attach_cntl(struct socket *so)
  461 {
  462         struct ngsock *privdata;
  463         struct ngpcb *pcbp;
  464         int error;
  465 
  466         /* Setup protocol control block */
  467         if ((error = ng_attach_common(so, NG_CONTROL)) != 0)
  468                 return (error);
  469         pcbp = sotongpcb(so);
  470 
  471         /* Allocate node private info */
  472         MALLOC(privdata, struct ngsock *,
  473             sizeof(*privdata), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO);
  474         if (privdata == NULL) {
  475                 ng_detach_common(pcbp, NG_CONTROL);
  476                 return (ENOMEM);
  477         }
  478 
  479         /* Make the generic node components */
  480         if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) {
  481                 FREE(privdata, M_NETGRAPH_SOCK);
  482                 ng_detach_common(pcbp, NG_CONTROL);
  483                 return (error);
  484         }
  485         NG_NODE_SET_PRIVATE(privdata->node, privdata);
  486 
  487         /* Link the pcb and the node private data */
  488         privdata->ctlsock = pcbp;
  489         pcbp->sockdata = privdata;
  490         privdata->refs++;
  491         return (0);
  492 }
  493 
  494 static int
  495 ng_attach_data(struct socket *so)
  496 {
  497         return(ng_attach_common(so, NG_DATA));
  498 }
  499 
  500 /*
  501  * Set up a socket protocol control block.
  502  * This code is shared between control and data sockets.
  503  */
  504 static int
  505 ng_attach_common(struct socket *so, int type)
  506 {
  507         struct ngpcb *pcbp;
  508         int error;
  509 
  510         /* Standard socket setup stuff */
  511         error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace);
  512         if (error)
  513                 return (error);
  514 
  515         /* Allocate the pcb */
  516         MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK | M_ZERO);
  517         if (pcbp == NULL)
  518                 return (ENOMEM);
  519         pcbp->type = type;
  520 
  521         /* Link the pcb and the socket */
  522         so->so_pcb = (caddr_t) pcbp;
  523         pcbp->ng_socket = so;
  524 
  525         /* Add the socket to linked list */
  526         LIST_INSERT_HEAD(&ngsocklist, pcbp, socks);
  527         return (0);
  528 }
  529 
  530 /*
  531  * Disassociate the socket from it's protocol specific
  532  * partner. If it's attached to a node's private data structure,
  533  * then unlink from that too. If we were the last socket attached to it,
  534  * then shut down the entire node. Shared code for control and data sockets.
  535  */
  536 static void
  537 ng_detach_common(struct ngpcb *pcbp, int which)
  538 {
  539         struct ngsock *priv;
  540 
  541         if (pcbp->sockdata) {
  542                 priv = pcbp->sockdata;
  543                 pcbp->sockdata = NULL;
  544                 switch (which) {
  545                 case NG_CONTROL:
  546                         priv->ctlsock = NULL;
  547                         break;
  548                 case NG_DATA:
  549                         priv->datasock = NULL;
  550                         break;
  551                 default:
  552                         panic(__func__);
  553                 }
  554                 if ((--priv->refs == 0) && (priv->node != NULL))
  555                         ng_rmnode_self(priv->node);
  556         }
  557         pcbp->ng_socket->so_pcb = NULL;
  558         pcbp->ng_socket = NULL;
  559         LIST_REMOVE(pcbp, socks);
  560         FREE(pcbp, M_PCB);
  561 }
  562 
  563 #ifdef NOTYET
  564 /*
  565  * File descriptors can be passed into an AF_NETGRAPH socket.
  566  * Note, that file descriptors cannot be passed OUT.
  567  * Only character device descriptors are accepted.
  568  * Character devices are useful to connect a graph to a device,
  569  * which after all is the purpose of this whole system.
  570  */
  571 static int
  572 ng_internalize(struct mbuf *control, struct thread *td)
  573 {
  574         const struct cmsghdr *cm = mtod(control, const struct cmsghdr *);
  575         struct file *fp;
  576         struct vnode *vn;
  577         int oldfds;
  578         int fd;
  579 
  580         if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET ||
  581             cm->cmsg_len != control->m_len) {
  582                 TRAP_ERROR;
  583                 return (EINVAL);
  584         }
  585 
  586         /* Check there is only one FD. XXX what would more than one signify? */
  587         oldfds = ((caddr_t)cm + cm->cmsg_len - (caddr_t)data) / sizeof (int);
  588         if (oldfds != 1) {
  589                 TRAP_ERROR;
  590                 return (EINVAL);
  591         }
  592 
  593         /* Check that the FD given is legit. and change it to a pointer to a
  594          * struct file. */
  595         fd = CMSG_DATA(cm);
  596         if ((error = fget(td, fd, &fp)) != 0)
  597                 return (error);
  598 
  599         /* Depending on what kind of resource it is, act differently. For
  600          * devices, we treat it as a file. For an AF_NETGRAPH socket,
  601          * shortcut straight to the node. */
  602         switch (fp->f_type) {
  603         case DTYPE_VNODE:
  604                 vn = fp->f_data;
  605                 if (vn && (vn->v_type == VCHR)) {
  606                         /* for a VCHR, actually reference the FILE */
  607                         fp->f_count++;
  608                         /* XXX then what :) */
  609                         /* how to pass on to other modules? */
  610                 } else {
  611                         fdrop(fp, td);
  612                         TRAP_ERROR;
  613                         return (EINVAL);
  614                 }
  615                 break;
  616         default:
  617                 fdrop(fp, td);
  618                 TRAP_ERROR;
  619                 return (EINVAL);
  620         }
  621         fdrop(fp, td);
  622         return (0);
  623 }
  624 #endif  /* NOTYET */
  625 
  626 /*
  627  * Connect the data socket to a named control socket node.
  628  */
  629 static int
  630 ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp)
  631 {
  632         struct sockaddr_ng *sap;
  633         node_p farnode;
  634         struct ngsock *priv;
  635         int error;
  636         item_p item;
  637 
  638         /* If we are already connected, don't do it again */
  639         if (pcbp->sockdata != NULL)
  640                 return (EISCONN);
  641 
  642         /* Find the target (victim) and check it doesn't already have a data
  643          * socket. Also check it is a 'socket' type node.
  644          * Use ng_package_data() and address_path() to do this.
  645          */
  646 
  647         sap = (struct sockaddr_ng *) nam;
  648         /* The item will hold the node reference */
  649         item = ng_package_data(NULL, NULL);
  650         if (item == NULL) {
  651                 return (ENOMEM);
  652         }
  653         if ((error = ng_address_path(NULL, item,  sap->sg_data, 0)))
  654                 return (error); /* item is freed on failure */
  655 
  656         /*
  657          * Extract node from item and free item. Remember we now have
  658          * a reference on the node. The item holds it for us.
  659          * when we free the item we release the reference.
  660          */
  661         farnode = item->el_dest; /* shortcut */
  662         if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) {
  663                 NG_FREE_ITEM(item); /* drop the reference to the node */
  664                 return (EINVAL);
  665         }
  666         priv = NG_NODE_PRIVATE(farnode);
  667         if (priv->datasock != NULL) {
  668                 NG_FREE_ITEM(item);     /* drop the reference to the node */
  669                 return (EADDRINUSE);
  670         }
  671 
  672         /*
  673          * Link the PCB and the private data struct. and note the extra
  674          * reference. Drop the extra reference on the node.
  675          */
  676         priv->datasock = pcbp;
  677         pcbp->sockdata = priv;
  678         priv->refs++; /* XXX possible race if it's being freed */
  679         NG_FREE_ITEM(item);     /* drop the reference to the node */
  680         return (0);
  681 }
  682 
  683 /*
  684  * Binding a socket means giving the corresponding node a name
  685  */
  686 static int
  687 ng_bind(struct sockaddr *nam, struct ngpcb *pcbp)
  688 {
  689         struct ngsock *const priv = pcbp->sockdata;
  690         struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam;
  691 
  692         if (priv == NULL) {
  693                 TRAP_ERROR;
  694                 return (EINVAL);
  695         }
  696         if ((sap->sg_len < 4)
  697         ||  (sap->sg_len > (NG_NODELEN + 3))
  698         ||  (sap->sg_data[0] == '\0')
  699         ||  (sap->sg_data[sap->sg_len - 3] != '\0')) {
  700                 TRAP_ERROR;
  701                 return (EINVAL);
  702         }
  703         return (ng_name_node(priv->node, sap->sg_data));
  704 }
  705 
  706 /*
  707  * Take a message and pass it up to the control socket associated
  708  * with the node.
  709  */
  710 static int
  711 ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr)
  712 {
  713         struct socket *const so = pcbp->ng_socket;
  714         struct mbuf *mdata;
  715         int msglen;
  716 
  717         /* Copy the message itself into an mbuf chain */
  718         msglen = sizeof(struct ng_mesg) + msg->header.arglen;
  719         mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL);
  720 
  721         /* Here we free the message, as we are the end of the line.
  722          * We need to do that regardless of whether we got mbufs. */
  723         NG_FREE_MSG(msg);
  724 
  725         if (mdata == NULL) {
  726                 TRAP_ERROR;
  727                 return (ENOBUFS);
  728         }
  729 
  730         /* Send it up to the socket */
  731         if (sbappendaddr(&so->so_rcv,
  732             (struct sockaddr *) addr, mdata, NULL) == 0) {
  733                 TRAP_ERROR;
  734                 m_freem(mdata);
  735                 return (ENOBUFS);
  736         }
  737         sorwakeup(so);
  738         return (0);
  739 }
  740 
  741 /*
  742  * You can only create new nodes from the socket end of things.
  743  */
  744 static int
  745 ngs_constructor(node_p nodep)
  746 {
  747         return (EINVAL);
  748 }
  749 
  750 /*
  751  * We allow any hook to be connected to the node.
  752  * There is no per-hook private information though.
  753  */
  754 static int
  755 ngs_newhook(node_p node, hook_p hook, const char *name)
  756 {
  757         NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node));
  758         return (0);
  759 }
  760 
  761 /* 
  762  * if only one hook, allow read(2) and write(2) to work.
  763  */
  764 static int
  765 ngs_connect(hook_p hook)
  766 {
  767         node_p node = NG_HOOK_NODE(hook);
  768         struct ngsock *priv = NG_NODE_PRIVATE(node);
  769 
  770         if ((priv->datasock)
  771         &&  (priv->datasock->ng_socket)) {
  772                 if (NG_NODE_NUMHOOKS(node) == 1) {
  773                         priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
  774                 } else {
  775                         priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
  776                 }
  777         }
  778         return (0);
  779 }
  780 
  781 /*
  782  * Incoming messages get passed up to the control socket.
  783  * Unless they are for us specifically (socket_type)
  784  */
  785 static int
  786 ngs_rcvmsg(node_p node, item_p item, hook_p lasthook)
  787 {
  788         struct ngsock *const priv = NG_NODE_PRIVATE(node);
  789         struct ngpcb *const pcbp = priv->ctlsock;
  790         struct sockaddr_ng *addr;
  791         int addrlen;
  792         int error = 0;
  793         struct  ng_mesg *msg;
  794         ng_ID_t retaddr = NGI_RETADDR(item);
  795         char    retabuf[32];
  796 
  797         NGI_GET_MSG(item, msg);
  798         NG_FREE_ITEM(item); /* we have all we need */
  799 
  800         /* Only allow mesgs to be passed if we have the control socket.
  801          * Data sockets can only support the generic messages. */
  802         if (pcbp == NULL) {
  803                 TRAP_ERROR;
  804                 return (EINVAL);
  805         }
  806 #ifdef TRACE_MESSAGES
  807 printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n",
  808 retaddr,
  809 msg->header.typecookie,
  810 msg->header.cmd,
  811 msg->header.cmdstr,
  812 msg->header.flags,
  813 msg->header.token);
  814 
  815 #endif
  816 
  817         if (msg->header.typecookie == NGM_SOCKET_COOKIE) {
  818                 switch (msg->header.cmd) {
  819                 case NGM_SOCK_CMD_NOLINGER:
  820                         priv->flags |= NGS_FLAG_NOLINGER;
  821                         break;
  822                 case NGM_SOCK_CMD_LINGER:
  823                         priv->flags &= ~NGS_FLAG_NOLINGER;
  824                         break;
  825                 default:
  826                         error = EINVAL;         /* unknown command */
  827                 }
  828                 /* Free the message and return */
  829                 NG_FREE_MSG(msg);
  830                 return(error);
  831 
  832         }
  833         /* Get the return address into a sockaddr */
  834         sprintf(retabuf,"[%x]:", retaddr);
  835         addrlen = strlen(retabuf);
  836         MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH_PATH, M_NOWAIT);
  837         if (addr == NULL) {
  838                 TRAP_ERROR;
  839                 return (ENOMEM);
  840         }
  841         addr->sg_len = addrlen + 3;
  842         addr->sg_family = AF_NETGRAPH;
  843         bcopy(retabuf, addr->sg_data, addrlen);
  844         addr->sg_data[addrlen] = '\0';
  845 
  846         /* Send it up */
  847         error = ship_msg(pcbp, msg, addr);
  848         FREE(addr, M_NETGRAPH_PATH);
  849         return (error);
  850 }
  851 
  852 /*
  853  * Receive data on a hook
  854  */
  855 static int
  856 ngs_rcvdata(hook_p hook, item_p item)
  857 {
  858         struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  859         struct ngpcb *const pcbp = priv->datasock;
  860         struct socket *so;
  861         struct sockaddr_ng *addr;
  862         char *addrbuf[NG_HOOKLEN + 1 + 4];
  863         int addrlen;
  864         struct mbuf *m;
  865 
  866         NGI_GET_M(item, m);
  867         NG_FREE_ITEM(item);
  868         /* If there is no data socket, black-hole it */
  869         if (pcbp == NULL) {
  870                 NG_FREE_M(m);
  871                 return (0);
  872         }
  873         so = pcbp->ng_socket;
  874 
  875         /* Get the return address into a sockaddr. */
  876         addrlen = strlen(NG_HOOK_NAME(hook));   /* <= NG_HOOKLEN */
  877         addr = (struct sockaddr_ng *) addrbuf;
  878         addr->sg_len = addrlen + 3;
  879         addr->sg_family = AF_NETGRAPH;
  880         bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen);
  881         addr->sg_data[addrlen] = '\0';
  882 
  883         /* Try to tell the socket which hook it came in on */
  884         if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) {
  885                 m_freem(m);
  886                 TRAP_ERROR;
  887                 return (ENOBUFS);
  888         }
  889         sorwakeup(so);
  890         return (0);
  891 }
  892 
  893 /*
  894  * Hook disconnection
  895  *
  896  * For this type, removal of the last link destroys the node
  897  * if the NOLINGER flag is set.
  898  */
  899 static int
  900 ngs_disconnect(hook_p hook)
  901 {
  902         node_p node = NG_HOOK_NODE(hook);
  903         struct ngsock *const priv = NG_NODE_PRIVATE(node);
  904 
  905         if ((priv->datasock)
  906         &&  (priv->datasock->ng_socket)) {
  907                 if (NG_NODE_NUMHOOKS(node) == 1) {
  908                         priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
  909                 } else {
  910                         priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
  911                 }
  912         }
  913 
  914         if ((priv->flags & NGS_FLAG_NOLINGER )
  915         && (NG_NODE_NUMHOOKS(node) == 0)
  916         && (NG_NODE_IS_VALID(node))) {
  917                 ng_rmnode_self(node);
  918         }
  919         return (0);
  920 }
  921 
  922 /*
  923  * Do local shutdown processing.
  924  * In this case, that involves making sure the socket
  925  * knows we should be shutting down.
  926  */
  927 static int
  928 ngs_shutdown(node_p node)
  929 {
  930         struct ngsock *const priv = NG_NODE_PRIVATE(node);
  931         struct ngpcb *const dpcbp = priv->datasock;
  932         struct ngpcb *const pcbp = priv->ctlsock;
  933 
  934         if (dpcbp != NULL) {
  935                 soisdisconnected(dpcbp->ng_socket);
  936                 dpcbp->sockdata = NULL;
  937                 priv->datasock = NULL;
  938                 priv->refs--;
  939         }
  940         if (pcbp != NULL) {
  941                 soisdisconnected(pcbp->ng_socket);
  942                 pcbp->sockdata = NULL;
  943                 priv->ctlsock = NULL;
  944                 priv->refs--;
  945         }
  946         NG_NODE_SET_PRIVATE(node, NULL);
  947         NG_NODE_UNREF(node);
  948         FREE(priv, M_NETGRAPH_SOCK);
  949         return (0);
  950 }
  951 
  952 static  int
  953 dummy_disconnect(struct socket *so)
  954 {
  955         return (0);
  956 }
  957 /*
  958  * Control and data socket type descriptors
  959  */
  960 
  961 static struct pr_usrreqs ngc_usrreqs = {
  962         NULL,                   /* abort */
  963         pru_accept_notsupp,
  964         ngc_attach,
  965         ngc_bind,
  966         ngc_connect,
  967         pru_connect2_notsupp,
  968         pru_control_notsupp,
  969         ngc_detach,
  970         dummy_disconnect,       /* disconnect */
  971         pru_listen_notsupp,
  972         NULL,                   /* setpeeraddr */
  973         pru_rcvd_notsupp,
  974         pru_rcvoob_notsupp,
  975         ngc_send,
  976         pru_sense_null,
  977         NULL,                   /* shutdown */
  978         ng_setsockaddr,
  979         sosend,
  980         soreceive,
  981         sopoll
  982 };
  983 
  984 static struct pr_usrreqs ngd_usrreqs = {
  985         NULL,                   /* abort */
  986         pru_accept_notsupp,
  987         ngd_attach,
  988         NULL,                   /* bind */
  989         ngd_connect,
  990         pru_connect2_notsupp,
  991         pru_control_notsupp,
  992         ngd_detach,
  993         dummy_disconnect,       /* disconnect */
  994         pru_listen_notsupp,
  995         NULL,                   /* setpeeraddr */
  996         pru_rcvd_notsupp,
  997         pru_rcvoob_notsupp,
  998         ngd_send,
  999         pru_sense_null,
 1000         NULL,                   /* shutdown */
 1001         ng_setsockaddr,
 1002         sosend,
 1003         soreceive,
 1004         sopoll
 1005 };
 1006 
 1007 /*
 1008  * Definitions of protocols supported in the NETGRAPH domain.
 1009  */
 1010 
 1011 extern struct domain ngdomain;          /* stop compiler warnings */
 1012 
 1013 static struct protosw ngsw[] = {
 1014         {
 1015                 SOCK_DGRAM,             /* protocol type */
 1016                 &ngdomain,              /* backpointer to domain */
 1017                 NG_CONTROL,
 1018                 PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */,  /* flags */
 1019                 0, 0, 0, 0,             /* input, output, ctlinput, ctloutput */
 1020                 NULL,                   /* ousrreq */
 1021                 0, 0, 0, 0,             /* init, fasttimeo, slowtimo, drain */
 1022                 &ngc_usrreqs,           /* usrreq table (above) */
 1023                 /*{NULL}*/              /* pffh (protocol filter head?) */
 1024         },
 1025         {
 1026                 SOCK_DGRAM,             /* protocol type */
 1027                 &ngdomain,              /* backpointer to domain */
 1028                 NG_DATA,
 1029                 PR_ATOMIC | PR_ADDR,    /* flags */
 1030                 0, 0, 0, 0,             /* input, output, ctlinput, ctloutput */
 1031                 NULL,                   /* ousrreq() */
 1032                 0, 0, 0, 0,             /* init, fasttimeo, slowtimo, drain */
 1033                 &ngd_usrreqs,           /* usrreq table (above) */
 1034                 /*{NULL}*/              /* pffh (protocol filter head?) */
 1035         }
 1036 };
 1037 
 1038 struct domain ngdomain = {
 1039         AF_NETGRAPH,
 1040         "netgraph",
 1041         NULL,                                   /* init() */
 1042         NULL,                                   /* externalise() */
 1043         NULL,                                   /* dispose() */
 1044         ngsw,                                   /* protosw entry */
 1045         &ngsw[sizeof(ngsw) / sizeof(ngsw[0])],  /* Number of protosw entries */
 1046         NULL,                                   /* next domain in list */
 1047         NULL,                                   /* rtattach() */
 1048         0,                                      /* arg to rtattach in bits */
 1049         0                                       /* maxrtkey */
 1050 };
 1051 
 1052 /*
 1053  * Handle loading and unloading for this node type
 1054  * This is to handle auxiliary linkages (e.g protocol domain addition).
 1055  */
 1056 static int
 1057 ngs_mod_event(module_t mod, int event, void *data)
 1058 {
 1059         int error = 0;
 1060 
 1061         switch (event) {
 1062         case MOD_LOAD:
 1063                 /* Register protocol domain */
 1064                 net_add_domain(&ngdomain);
 1065                 break;
 1066         case MOD_UNLOAD:
 1067                 /* Insure there are no open netgraph sockets */
 1068                 if (!LIST_EMPTY(&ngsocklist)) {
 1069                         error = EBUSY;
 1070                         break;
 1071                 }
 1072 
 1073 #ifdef NOTYET
 1074                 if ((LIST_EMPTY(&ngsocklist)) && (typestruct.refs == 0)) {
 1075                 /* Unregister protocol domain XXX can't do this yet.. */
 1076                         if ((error = net_rm_domain(&ngdomain)) != 0)
 1077                                 break;
 1078                 } else
 1079 #endif
 1080                         error = EBUSY;
 1081                 break;
 1082         default:
 1083                 error = EOPNOTSUPP;
 1084                 break;
 1085         }
 1086         return (error);
 1087 }
 1088 
 1089 SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, "");
 1090 SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA");
 1091 SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, "");
 1092 SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL");
 1093 SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, "");
 1094 

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