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: stable/3/sys/netgraph/ng_UI.c 67532 2000-10-24 22:45:12Z julian $
   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_rmnode;
   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_VERSION,
   81         NG_UI_NODE_TYPE,
   82         NULL,
   83         ng_UI_constructor,
   84         ng_UI_rcvmsg,
   85         ng_UI_rmnode,
   86         ng_UI_newhook,
   87         NULL,
   88         NULL,
   89         ng_UI_rcvdata,
   90         ng_UI_rcvdata,
   91         ng_UI_disconnect,
   92         NULL
   93 };
   94 NETGRAPH_INIT(UI, &typestruct);
   95 
   96 /************************************************************************
   97                         NETGRAPH NODE STUFF
   98  ************************************************************************/
   99 
  100 /*
  101  * Create a newborn node. We start with an implicit reference.
  102  */
  103 
  104 static int
  105 ng_UI_constructor(node_p *nodep)
  106 {
  107         priv_p  priv;
  108         int     error;
  109 
  110         /* Allocate private structure */
  111         MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_WAITOK);
  112         if (priv == NULL)
  113                 return (ENOMEM);
  114         bzero(priv, sizeof(*priv));
  115 
  116         /* Call generic node constructor */
  117         if ((error = ng_make_node_common(&typestruct, nodep))) {
  118                 FREE(priv, M_NETGRAPH);
  119                 return (error);
  120         }
  121         (*nodep)->private = priv;
  122 
  123         /* Done */
  124         return (0);
  125 }
  126 
  127 /*
  128  * Give our ok for a hook to be added
  129  */
  130 static int
  131 ng_UI_newhook(node_p node, hook_p hook, const char *name)
  132 {
  133         const priv_p priv = node->private;
  134 
  135         if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) {
  136                 if (priv->downlink)
  137                         return (EISCONN);
  138                 priv->downlink = hook;
  139         } else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) {
  140                 if (priv->uplink)
  141                         return (EISCONN);
  142                 priv->uplink = hook;
  143         } else
  144                 return (EINVAL);
  145         return (0);
  146 }
  147 
  148 /*
  149  * Receive a control message
  150  */
  151 static int
  152 ng_UI_rcvmsg(node_p node, struct ng_mesg *msg,
  153              const char *raddr, struct ng_mesg **rp)
  154 {
  155         FREE(msg, M_NETGRAPH);
  156         return (EINVAL);
  157 }
  158 
  159 #define MAX_ENCAPS_HDR  1
  160 #define ERROUT(x)       do { error = (x); goto done; } while (0)
  161 
  162 /*
  163  * Receive a data frame
  164  */
  165 static int
  166 ng_UI_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
  167 {
  168         const node_p node = hook->node;
  169         const priv_p priv = node->private;
  170         int error = 0;
  171 
  172         if (hook == priv->downlink) {
  173                 u_char *start, *ptr;
  174 
  175                 if (!m || (m->m_len < MAX_ENCAPS_HDR
  176                     && !(m = m_pullup(m, MAX_ENCAPS_HDR))))
  177                         ERROUT(ENOBUFS);
  178                 ptr = start = mtod(m, u_char *);
  179 
  180                 /* Must be UI frame */
  181                 if (*ptr++ != HDLC_UI)
  182                         ERROUT(0);
  183 
  184                 m_adj(m, ptr - start);
  185                 NG_SEND_DATA(error, priv->uplink, m, meta);     /* m -> NULL */
  186         } else if (hook == priv->uplink) {
  187                 M_PREPEND(m, 1, M_DONTWAIT);    /* Prepend IP NLPID */
  188                 if (!m)
  189                         ERROUT(ENOBUFS);
  190                 mtod(m, u_char *)[0] = HDLC_UI;
  191                 NG_SEND_DATA(error, priv->downlink, m, meta);   /* m -> NULL */
  192         } else
  193                 panic(__FUNCTION__);
  194 
  195 done:
  196         NG_FREE_DATA(m, meta);  /* does nothing if m == NULL */
  197         return (error);
  198 }
  199 
  200 /*
  201  * Shutdown node
  202  */
  203 static int
  204 ng_UI_rmnode(node_p node)
  205 {
  206         const priv_p priv = node->private;
  207 
  208         /* Take down netgraph node */
  209         node->flags |= NG_INVALID;
  210         ng_cutlinks(node);
  211         ng_unname(node);
  212         bzero(priv, sizeof(*priv));
  213         FREE(priv, M_NETGRAPH);
  214         node->private = NULL;
  215         ng_unref(node);
  216         return (0);
  217 }
  218 
  219 /*
  220  * Hook disconnection
  221  */
  222 static int
  223 ng_UI_disconnect(hook_p hook)
  224 {
  225         const priv_p priv = hook->node->private;
  226 
  227         if (hook->node->numhooks == 0)
  228                 ng_rmnode(hook->node);
  229         else if (hook == priv->downlink)
  230                 priv->downlink = NULL;
  231         else if (hook == priv->uplink)
  232                 priv->uplink = NULL;
  233         else
  234                 panic(__FUNCTION__);
  235         return (0);
  236 }
  237 

Cache object: 2bd5aa08480057a4db70ef91a6aed6e3


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