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  * ng_UI.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: src/sys/netgraph/ng_UI.c,v 1.19.2.1 2005/01/31 23:26:28 imp Exp $
   41  * $Whistle: ng_UI.c,v 1.14 1999/11/01 09:24:51 julian Exp $
   42  */
   43 
   44 #include <sys/param.h>
   45 #include <sys/systm.h>
   46 #include <sys/errno.h>
   47 #include <sys/kernel.h>
   48 #include <sys/malloc.h>
   49 #include <sys/mbuf.h>
   50 #include <sys/errno.h>
   51 
   52 
   53 #include <netgraph/ng_message.h>
   54 #include <netgraph/netgraph.h>
   55 #include <netgraph/ng_UI.h>
   56 
   57 /*
   58  * DEFINITIONS
   59  */
   60 
   61 /* Everything, starting with sdlc on has defined UI as 0x03 */
   62 #define HDLC_UI 0x03
   63 
   64 /* Node private data */
   65 struct ng_UI_private {
   66         hook_p  downlink;
   67         hook_p  uplink;
   68 };
   69 typedef struct ng_UI_private *priv_p;
   70 
   71 /* Netgraph node methods */
   72 static ng_constructor_t ng_UI_constructor;
   73 static ng_rcvmsg_t      ng_UI_rcvmsg;
   74 static ng_shutdown_t    ng_UI_shutdown;
   75 static ng_newhook_t     ng_UI_newhook;
   76 static ng_rcvdata_t     ng_UI_rcvdata;
   77 static ng_disconnect_t  ng_UI_disconnect;
   78 
   79 /* Node type descriptor */
   80 static struct ng_type typestruct = {
   81         .version =      NG_ABI_VERSION,
   82         .name =         NG_UI_NODE_TYPE,
   83         .constructor =  ng_UI_constructor,
   84         .rcvmsg =       ng_UI_rcvmsg,
   85         .shutdown =     ng_UI_shutdown,
   86         .newhook =      ng_UI_newhook,
   87         .rcvdata =      ng_UI_rcvdata,
   88         .disconnect =   ng_UI_disconnect,
   89 };
   90 NETGRAPH_INIT(UI, &typestruct);
   91 
   92 /************************************************************************
   93                         NETGRAPH NODE STUFF
   94  ************************************************************************/
   95 
   96 /*
   97  * Create a newborn node. We start with an implicit reference.
   98  */
   99 
  100 static int
  101 ng_UI_constructor(node_p node)
  102 {
  103         priv_p  priv;
  104 
  105         /* Allocate private structure */
  106         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
  107         if (priv == NULL) {
  108                 return (ENOMEM);
  109         }
  110         NG_NODE_SET_PRIVATE(node, priv);
  111         return (0);
  112 }
  113 
  114 /*
  115  * Give our ok for a hook to be added
  116  */
  117 static int
  118 ng_UI_newhook(node_p node, hook_p hook, const char *name)
  119 {
  120         const priv_p priv = NG_NODE_PRIVATE(node);
  121 
  122         if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) {
  123                 if (priv->downlink)
  124                         return (EISCONN);
  125                 priv->downlink = hook;
  126         } else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) {
  127                 if (priv->uplink)
  128                         return (EISCONN);
  129                 priv->uplink = hook;
  130         } else
  131                 return (EINVAL);
  132         return (0);
  133 }
  134 
  135 /*
  136  * Receive a control message
  137  */
  138 static int
  139 ng_UI_rcvmsg(node_p node, item_p item, hook_p lasthook)
  140 {
  141         int     error;
  142         const priv_p priv = NG_NODE_PRIVATE(node);
  143         struct ng_mesg *msg;
  144 
  145         msg = NGI_MSG(item); /* only peeking */
  146         if ((msg->header.typecookie == NGM_FLOW_COOKIE) && lasthook)  {
  147                 if (lasthook == priv->downlink) {
  148                         if (priv->uplink) {
  149                                 NG_FWD_ITEM_HOOK(error, item, priv->uplink);
  150                                 return (error);
  151                         }
  152                 } else {
  153                         if (priv->downlink) {
  154                                 NG_FWD_ITEM_HOOK(error, item, priv->downlink);
  155                                 return (error);
  156                         }
  157                 }
  158         }
  159                 
  160         NG_FREE_ITEM(item);
  161         return (EINVAL);
  162 }
  163 
  164 #define MAX_ENCAPS_HDR  1
  165 #define ERROUT(x)       do { error = (x); goto done; } while (0)
  166 
  167 /*
  168  * Receive a data frame
  169  */
  170 static int
  171 ng_UI_rcvdata(hook_p hook, item_p item)
  172 {
  173         const node_p node = NG_HOOK_NODE(hook);
  174         const priv_p priv = NG_NODE_PRIVATE(node);
  175         struct mbuf *m;
  176         int error = 0;
  177 
  178         NGI_GET_M(item, m);
  179         if (hook == priv->downlink) {
  180                 u_char *start, *ptr;
  181 
  182                 if (m->m_len < MAX_ENCAPS_HDR
  183                     && !(m = m_pullup(m, MAX_ENCAPS_HDR)))
  184                         ERROUT(ENOBUFS);
  185                 ptr = start = mtod(m, u_char *);
  186 
  187                 /* Must be UI frame */
  188                 if (*ptr++ != HDLC_UI)
  189                         ERROUT(0);
  190 
  191                 m_adj(m, ptr - start);
  192                 NG_FWD_NEW_DATA(error, item, priv->uplink, m);  /* m -> NULL */
  193         } else if (hook == priv->uplink) {
  194                 M_PREPEND(m, 1, M_DONTWAIT);    /* Prepend IP NLPID */
  195                 if (!m)
  196                         ERROUT(ENOBUFS);
  197                 mtod(m, u_char *)[0] = HDLC_UI;
  198                 NG_FWD_NEW_DATA(error, item, priv->downlink, m);        /* m -> NULL */
  199         } else
  200                 panic(__func__);
  201 
  202 done:
  203         NG_FREE_M(m);   /* does nothing if m == NULL */
  204         if (item)
  205                 NG_FREE_ITEM(item);
  206         return (error);
  207 }
  208 
  209 /*
  210  * Shutdown node
  211  */
  212 static int
  213 ng_UI_shutdown(node_p node)
  214 {
  215         const priv_p priv = NG_NODE_PRIVATE(node);
  216 
  217         /* Take down netgraph node */
  218         FREE(priv, M_NETGRAPH);
  219         NG_NODE_SET_PRIVATE(node, NULL);
  220         NG_NODE_UNREF(node);
  221         return (0);
  222 }
  223 
  224 /*
  225  * Hook disconnection
  226  */
  227 static int
  228 ng_UI_disconnect(hook_p hook)
  229 {
  230         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  231 
  232         if (hook == priv->downlink)
  233                 priv->downlink = NULL;
  234         else if (hook == priv->uplink)
  235                 priv->uplink = NULL;
  236         else
  237                 panic(__func__);
  238         /*
  239          * If we are not already shutting down,
  240          * and we have no more hooks, then DO shut down.
  241          */
  242         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  243         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
  244                         ng_rmnode_self(NG_HOOK_NODE(hook));
  245         }
  246         return (0);
  247 }
  248 

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