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  * $FreeBSD$
   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 #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         .version =      NG_ABI_VERSION,
   81         .name =         NG_UI_NODE_TYPE,
   82         .constructor =  ng_UI_constructor,
   83         .rcvmsg =       ng_UI_rcvmsg,
   84         .shutdown =     ng_UI_shutdown,
   85         .newhook =      ng_UI_newhook,
   86         .rcvdata =      ng_UI_rcvdata,
   87         .disconnect =   ng_UI_disconnect,
   88 };
   89 NETGRAPH_INIT(UI, &typestruct);
   90 
   91 /************************************************************************
   92                         NETGRAPH NODE STUFF
   93  ************************************************************************/
   94 
   95 /*
   96  * Create a newborn node. We start with an implicit reference.
   97  */
   98 
   99 static int
  100 ng_UI_constructor(node_p node)
  101 {
  102         priv_p  priv;
  103 
  104         /* Allocate private structure */
  105         priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
  106         NG_NODE_SET_PRIVATE(node, priv);
  107         return (0);
  108 }
  109 
  110 /*
  111  * Give our ok for a hook to be added
  112  */
  113 static int
  114 ng_UI_newhook(node_p node, hook_p hook, const char *name)
  115 {
  116         const priv_p priv = NG_NODE_PRIVATE(node);
  117 
  118         if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) {
  119                 if (priv->downlink)
  120                         return (EISCONN);
  121                 priv->downlink = hook;
  122         } else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) {
  123                 if (priv->uplink)
  124                         return (EISCONN);
  125                 priv->uplink = hook;
  126         } else
  127                 return (EINVAL);
  128         return (0);
  129 }
  130 
  131 /*
  132  * Receive a control message
  133  */
  134 static int
  135 ng_UI_rcvmsg(node_p node, item_p item, hook_p lasthook)
  136 {
  137         int     error;
  138         const priv_p priv = NG_NODE_PRIVATE(node);
  139         struct ng_mesg *msg;
  140 
  141         msg = NGI_MSG(item); /* only peeking */
  142         if ((msg->header.typecookie == NGM_FLOW_COOKIE) && lasthook)  {
  143                 if (lasthook == priv->downlink) {
  144                         if (priv->uplink) {
  145                                 NG_FWD_ITEM_HOOK(error, item, priv->uplink);
  146                                 return (error);
  147                         }
  148                 } else {
  149                         if (priv->downlink) {
  150                                 NG_FWD_ITEM_HOOK(error, item, priv->downlink);
  151                                 return (error);
  152                         }
  153                 }
  154         }
  155                 
  156         NG_FREE_ITEM(item);
  157         return (EINVAL);
  158 }
  159 
  160 #define MAX_ENCAPS_HDR  1
  161 #define ERROUT(x)       do { error = (x); goto done; } while (0)
  162 
  163 /*
  164  * Receive a data frame
  165  */
  166 static int
  167 ng_UI_rcvdata(hook_p hook, item_p item)
  168 {
  169         const node_p node = NG_HOOK_NODE(hook);
  170         const priv_p priv = NG_NODE_PRIVATE(node);
  171         struct mbuf *m;
  172         int error = 0;
  173 
  174         NGI_GET_M(item, m);
  175         if (hook == priv->downlink) {
  176                 u_char *start, *ptr;
  177 
  178                 if (m->m_len < MAX_ENCAPS_HDR
  179                     && !(m = m_pullup(m, MAX_ENCAPS_HDR)))
  180                         ERROUT(ENOBUFS);
  181                 ptr = start = mtod(m, u_char *);
  182 
  183                 /* Must be UI frame */
  184                 if (*ptr++ != HDLC_UI)
  185                         ERROUT(0);
  186 
  187                 m_adj(m, ptr - start);
  188                 NG_FWD_NEW_DATA(error, item, priv->uplink, m);  /* m -> NULL */
  189         } else if (hook == priv->uplink) {
  190                 M_PREPEND(m, 1, M_NOWAIT);      /* Prepend IP NLPID */
  191                 if (!m)
  192                         ERROUT(ENOBUFS);
  193                 mtod(m, u_char *)[0] = HDLC_UI;
  194                 NG_FWD_NEW_DATA(error, item, priv->downlink, m);        /* m -> NULL */
  195         } else
  196                 panic("%s", __func__);
  197 
  198 done:
  199         NG_FREE_M(m);   /* does nothing if m == NULL */
  200         if (item)
  201                 NG_FREE_ITEM(item);
  202         return (error);
  203 }
  204 
  205 /*
  206  * Shutdown node
  207  */
  208 static int
  209 ng_UI_shutdown(node_p node)
  210 {
  211         const priv_p priv = NG_NODE_PRIVATE(node);
  212 
  213         /* Take down netgraph node */
  214         free(priv, M_NETGRAPH);
  215         NG_NODE_SET_PRIVATE(node, NULL);
  216         NG_NODE_UNREF(node);
  217         return (0);
  218 }
  219 
  220 /*
  221  * Hook disconnection
  222  */
  223 static int
  224 ng_UI_disconnect(hook_p hook)
  225 {
  226         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  227 
  228         if (hook == priv->downlink)
  229                 priv->downlink = NULL;
  230         else if (hook == priv->uplink)
  231                 priv->uplink = NULL;
  232         else
  233                 panic("%s", __func__);
  234         /*
  235          * If we are not already shutting down,
  236          * and we have no more hooks, then DO shut down.
  237          */
  238         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  239         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
  240                         ng_rmnode_self(NG_HOOK_NODE(hook));
  241         }
  242         return (0);
  243 }

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

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