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: stable/9/sys/netgraph/ng_UI.c 220768 2011-04-18 09:12:27Z glebius $
   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         priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
  107         NG_NODE_SET_PRIVATE(node, priv);
  108         return (0);
  109 }
  110 
  111 /*
  112  * Give our ok for a hook to be added
  113  */
  114 static int
  115 ng_UI_newhook(node_p node, hook_p hook, const char *name)
  116 {
  117         const priv_p priv = NG_NODE_PRIVATE(node);
  118 
  119         if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) {
  120                 if (priv->downlink)
  121                         return (EISCONN);
  122                 priv->downlink = hook;
  123         } else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) {
  124                 if (priv->uplink)
  125                         return (EISCONN);
  126                 priv->uplink = hook;
  127         } else
  128                 return (EINVAL);
  129         return (0);
  130 }
  131 
  132 /*
  133  * Receive a control message
  134  */
  135 static int
  136 ng_UI_rcvmsg(node_p node, item_p item, hook_p lasthook)
  137 {
  138         int     error;
  139         const priv_p priv = NG_NODE_PRIVATE(node);
  140         struct ng_mesg *msg;
  141 
  142         msg = NGI_MSG(item); /* only peeking */
  143         if ((msg->header.typecookie == NGM_FLOW_COOKIE) && lasthook)  {
  144                 if (lasthook == priv->downlink) {
  145                         if (priv->uplink) {
  146                                 NG_FWD_ITEM_HOOK(error, item, priv->uplink);
  147                                 return (error);
  148                         }
  149                 } else {
  150                         if (priv->downlink) {
  151                                 NG_FWD_ITEM_HOOK(error, item, priv->downlink);
  152                                 return (error);
  153                         }
  154                 }
  155         }
  156                 
  157         NG_FREE_ITEM(item);
  158         return (EINVAL);
  159 }
  160 
  161 #define MAX_ENCAPS_HDR  1
  162 #define ERROUT(x)       do { error = (x); goto done; } while (0)
  163 
  164 /*
  165  * Receive a data frame
  166  */
  167 static int
  168 ng_UI_rcvdata(hook_p hook, item_p item)
  169 {
  170         const node_p node = NG_HOOK_NODE(hook);
  171         const priv_p priv = NG_NODE_PRIVATE(node);
  172         struct mbuf *m;
  173         int error = 0;
  174 
  175         NGI_GET_M(item, m);
  176         if (hook == priv->downlink) {
  177                 u_char *start, *ptr;
  178 
  179                 if (m->m_len < MAX_ENCAPS_HDR
  180                     && !(m = m_pullup(m, MAX_ENCAPS_HDR)))
  181                         ERROUT(ENOBUFS);
  182                 ptr = start = mtod(m, u_char *);
  183 
  184                 /* Must be UI frame */
  185                 if (*ptr++ != HDLC_UI)
  186                         ERROUT(0);
  187 
  188                 m_adj(m, ptr - start);
  189                 NG_FWD_NEW_DATA(error, item, priv->uplink, m);  /* m -> NULL */
  190         } else if (hook == priv->uplink) {
  191                 M_PREPEND(m, 1, M_DONTWAIT);    /* Prepend IP NLPID */
  192                 if (!m)
  193                         ERROUT(ENOBUFS);
  194                 mtod(m, u_char *)[0] = HDLC_UI;
  195                 NG_FWD_NEW_DATA(error, item, priv->downlink, m);        /* m -> NULL */
  196         } else
  197                 panic("%s", __func__);
  198 
  199 done:
  200         NG_FREE_M(m);   /* does nothing if m == NULL */
  201         if (item)
  202                 NG_FREE_ITEM(item);
  203         return (error);
  204 }
  205 
  206 /*
  207  * Shutdown node
  208  */
  209 static int
  210 ng_UI_shutdown(node_p node)
  211 {
  212         const priv_p priv = NG_NODE_PRIVATE(node);
  213 
  214         /* Take down netgraph node */
  215         free(priv, M_NETGRAPH);
  216         NG_NODE_SET_PRIVATE(node, NULL);
  217         NG_NODE_UNREF(node);
  218         return (0);
  219 }
  220 
  221 /*
  222  * Hook disconnection
  223  */
  224 static int
  225 ng_UI_disconnect(hook_p hook)
  226 {
  227         const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
  228 
  229         if (hook == priv->downlink)
  230                 priv->downlink = NULL;
  231         else if (hook == priv->uplink)
  232                 priv->uplink = NULL;
  233         else
  234                 panic("%s", __func__);
  235         /*
  236          * If we are not already shutting down,
  237          * and we have no more hooks, then DO shut down.
  238          */
  239         if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  240         && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
  241                         ng_rmnode_self(NG_HOOK_NODE(hook));
  242         }
  243         return (0);
  244 }
  245 

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