The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_UI.c

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    1 
    2 /*
    3  * ng_UI.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/5.0/sys/netgraph/ng_UI.c 87599 2001-12-10 08:09:49Z obrien $
   40  * $Whistle: ng_UI.c,v 1.14 1999/11/01 09:24:51 julian Exp $
   41  */
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/errno.h>
   46 #include <sys/kernel.h>
   47 #include <sys/malloc.h>
   48 #include <sys/mbuf.h>
   49 #include <sys/errno.h>
   50 
   51 
   52 #include <netgraph/ng_message.h>
   53 #include <netgraph/netgraph.h>
   54 #include <netgraph/ng_UI.h>
   55 
   56 /*
   57  * DEFINITIONS
   58  */
   59 
   60 /* Everything, starting with sdlc on has defined UI as 0x03 */
   61 #define HDLC_UI 0x03
   62 
   63 /* Node private data */
   64 struct ng_UI_private {
   65         hook_p  downlink;
   66         hook_p  uplink;
   67 };
   68 typedef struct ng_UI_private *priv_p;
   69 
   70 /* Netgraph node methods */
   71 static ng_constructor_t ng_UI_constructor;
   72 static ng_rcvmsg_t      ng_UI_rcvmsg;
   73 static ng_shutdown_t    ng_UI_shutdown;
   74 static ng_newhook_t     ng_UI_newhook;
   75 static ng_rcvdata_t     ng_UI_rcvdata;
   76 static ng_disconnect_t  ng_UI_disconnect;
   77 
   78 /* Node type descriptor */
   79 static struct ng_type typestruct = {
   80         NG_ABI_VERSION,
   81         NG_UI_NODE_TYPE,
   82         NULL,
   83         ng_UI_constructor,
   84         ng_UI_rcvmsg,
   85         ng_UI_shutdown,
   86         ng_UI_newhook,
   87         NULL,
   88         NULL,
   89         ng_UI_rcvdata,
   90         ng_UI_disconnect,
   91         NULL
   92 };
   93 NETGRAPH_INIT(UI, &typestruct);
   94 
   95 /************************************************************************
   96                         NETGRAPH NODE STUFF
   97  ************************************************************************/
   98 
   99 /*
  100  * Create a newborn node. We start with an implicit reference.
  101  */
  102 
  103 static int
  104 ng_UI_constructor(node_p node)
  105 {
  106         priv_p  priv;
  107 
  108         /* Allocate private structure */
  109         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
  110         if (priv == NULL) {
  111                 return (ENOMEM);
  112         }
  113         NG_NODE_SET_PRIVATE(node, priv);
  114         return (0);
  115 }
  116 
  117 /*
  118  * Give our ok for a hook to be added
  119  */
  120 static int
  121 ng_UI_newhook(node_p node, hook_p hook, const char *name)
  122 {
  123         const priv_p priv = NG_NODE_PRIVATE(node);
  124 
  125         if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) {
  126                 if (priv->downlink)
  127                         return (EISCONN);
  128                 priv->downlink = hook;
  129         } else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) {
  130                 if (priv->uplink)
  131                         return (EISCONN);
  132                 priv->uplink = hook;
  133         } else
  134                 return (EINVAL);
  135         return (0);
  136 }
  137 
  138 /*
  139  * Receive a control message
  140  */
  141 static int
  142 ng_UI_rcvmsg(node_p node, item_p item, hook_p lasthook)
  143 {
  144         int     error;
  145         const priv_p priv = NG_NODE_PRIVATE(node);
  146         struct ng_mesg *msg;
  147 
  148         msg = NGI_MSG(item); /* only peeking */
  149         if ((msg->header.typecookie == NGM_FLOW_COOKIE) && lasthook)  {
  150                 if (lasthook == priv->downlink) {
  151                         if (priv->uplink) {
  152                                 NG_FWD_ITEM_HOOK(error, item, priv->uplink);
  153                                 return (error);
  154                         }
  155                 } else {
  156                         if (priv->downlink) {
  157                                 NG_FWD_ITEM_HOOK(error, item, priv->downlink);
  158                                 return (error);
  159                         }
  160                 }
  161         }
  162                 
  163         NG_FREE_ITEM(item);
  164         return (EINVAL);
  165 }
  166 
  167 #define MAX_ENCAPS_HDR  1
  168 #define ERROUT(x)       do { error = (x); goto done; } while (0)
  169 
  170 /*
  171  * Receive a data frame
  172  */
  173 static int
  174 ng_UI_rcvdata(hook_p hook, item_p item)
  175 {
  176         const node_p node = NG_HOOK_NODE(hook);
  177         const priv_p priv = NG_NODE_PRIVATE(node);
  178         struct mbuf *m;
  179         int error = 0;
  180 
  181         NGI_GET_M(item, m);
  182         if (hook == priv->downlink) {
  183                 u_char *start, *ptr;
  184 
  185                 if (!m || (m->m_len < MAX_ENCAPS_HDR
  186                     && !(m = m_pullup(m, MAX_ENCAPS_HDR))))
  187                         ERROUT(ENOBUFS);
  188                 ptr = start = mtod(m, u_char *);
  189 
  190                 /* Must be UI frame */
  191                 if (*ptr++ != HDLC_UI)
  192                         ERROUT(0);
  193 
  194                 m_adj(m, ptr - start);
  195                 NG_FWD_NEW_DATA(error, item, priv->uplink, m);  /* m -> NULL */
  196         } else if (hook == priv->uplink) {
  197                 M_PREPEND(m, 1, M_DONTWAIT);    /* Prepend IP NLPID */
  198                 if (!m)
  199                         ERROUT(ENOBUFS);
  200                 mtod(m, u_char *)[0] = HDLC_UI;
  201                 NG_FWD_NEW_DATA(error, item, priv->downlink, m);        /* m -> NULL */
  202         } else
  203                 panic(__func__);
  204 
  205 done:
  206         NG_FREE_M(m);   /* does nothing if m == NULL */
  207         if (item)
  208                 NG_FREE_ITEM(item);
  209         return (error);
  210 }
  211 
  212 /*
  213  * Shutdown node
  214  */
  215 static int
  216 ng_UI_shutdown(node_p node)
  217 {
  218         const priv_p priv = NG_NODE_PRIVATE(node);
  219 
  220         /* Take down netgraph node */
  221         FREE(priv, M_NETGRAPH);
  222         NG_NODE_SET_PRIVATE(node, NULL);
  223         NG_NODE_UNREF(node);
  224         return (0);
  225 }
  226 
  227 /*
  228  * Hook disconnection
  229  */
  230 static int
  231 ng_UI_disconnect(hook_p hook)
  232 {
  233         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  234 
  235         if (hook == priv->downlink)
  236                 priv->downlink = NULL;
  237         else if (hook == priv->uplink)
  238                 priv->uplink = NULL;
  239         else
  240                 panic(__func__);
  241         /*
  242          * If we are not already shutting down,
  243          * and we have no more hooks, then DO shut down.
  244          */
  245         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  246         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
  247                         ng_rmnode_self(NG_HOOK_NODE(hook));
  248         }
  249         return (0);
  250 }
  251 

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