ng_hole.c

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    1 
    2 /*
    3  * ng_hole.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 Elisher <julian@freebsd.org>
   38  *
   39  * $FreeBSD$
   40  * $Whistle: ng_hole.c,v 1.10 1999/11/01 09:24:51 julian Exp $
   41  */
   42 
   43 /*
   44  * This node is a 'black hole' that simply discards everything it receives
   45  */
   46 
   47 #include <sys/param.h>
   48 #include <sys/systm.h>
   49 #include <sys/kernel.h>
   50 #include <sys/malloc.h>
   51 #include <sys/mbuf.h>
   52 #include <netgraph/ng_message.h>
   53 #include <netgraph/netgraph.h>
   54 #include <netgraph/ng_parse.h>
   55 #include <netgraph/ng_hole.h>
   56 
   57 /* Per hook private info. */
   58 struct ng_hole_hookinfo {
   59         struct ng_hole_hookstat stats;
   60 };
   61 typedef struct ng_hole_hookinfo *hinfo_p;
   62 
   63 /* Parse type for struct ng_hole_hookstat. */
   64 static const struct ng_parse_struct_field ng_hole_hookstat_type_fields[] =
   65         NG_HOLE_HOOKSTAT_TYPE_INFO;
   66 static const struct ng_parse_type ng_hole_hookstat_type = {
   67         &ng_parse_struct_type,
   68         &ng_hole_hookstat_type_fields
   69 };
   70 
   71 /* List of commands and how to convert arguments to/from ASCII. */
   72 static const struct ng_cmdlist ng_hole_cmdlist[] = {
   73         {
   74           NGM_HOLE_COOKIE,
   75           NGM_HOLE_GET_STATS,
   76           "getstats",
   77           &ng_parse_hookbuf_type,
   78           &ng_hole_hookstat_type
   79         },
   80         {
   81           NGM_HOLE_COOKIE,
   82           NGM_HOLE_CLR_STATS,
   83           "clrstats",
   84           &ng_parse_hookbuf_type,
   85           NULL
   86         },
   87         {
   88           NGM_HOLE_COOKIE,
   89           NGM_HOLE_GETCLR_STATS,
   90           "getclrstats",
   91           &ng_parse_hookbuf_type,
   92           &ng_hole_hookstat_type
   93         },
   94         { 0 }
   95 };
   96 
   97 /* Netgraph methods */
   98 static ng_rcvmsg_t      ngh_rcvmsg;
   99 static ng_newhook_t     ngh_newhook;
  100 static ng_rcvdata_t     ngh_rcvdata;
  101 static ng_disconnect_t  ngh_disconnect;
  102 
  103 static struct ng_type typestruct = {
  104         NG_VERSION,
  105         NG_HOLE_NODE_TYPE,
  106         NULL,
  107         NULL,
  108         ngh_rcvmsg,
  109         NULL,
  110         ngh_newhook,
  111         NULL,
  112         NULL,
  113         ngh_rcvdata,
  114         ngh_rcvdata,
  115         ngh_disconnect,
  116         ng_hole_cmdlist
  117 };
  118 NETGRAPH_INIT(hole, &typestruct);
  119 
  120 /*
  121  * Add a hook.
  122  */
  123 static int
  124 ngh_newhook(node_p node, hook_p hook, const char *name)
  125 {
  126         hinfo_p hip;
  127 
  128         /* Create hook private structure. */
  129         MALLOC(hip, hinfo_p, sizeof(*hip), M_NETGRAPH, M_NOWAIT | M_ZERO);
  130         if (hip == NULL)
  131                 return (ENOMEM);
  132         NG_HOOK_SET_PRIVATE(hook, hip);
  133         return (0);
  134 }
  135 
  136 /*
  137  * Receive a control message.
  138  */
  139 static int
  140 ngh_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr,
  141     struct ng_mesg **rptr)
  142 {
  143         struct ng_mesg *resp = NULL;
  144         int error = 0;
  145         struct ng_hole_hookstat *stats;
  146         hook_p hook;
  147 
  148         switch (msg->header.typecookie) {
  149         case NGM_HOLE_COOKIE:
  150                 switch (msg->header.cmd) {
  151                 case NGM_HOLE_GET_STATS:
  152                 case NGM_HOLE_CLR_STATS:
  153                 case NGM_HOLE_GETCLR_STATS:
  154                         /* Sanity check. */
  155                         if (msg->header.arglen != NG_HOOKLEN + 1) {
  156                                 error = EINVAL;
  157                                 break;
  158                         }
  159                         /* Find hook. */
  160                         hook = ng_findhook(node, (char *)msg->data);
  161                         if (hook == NULL) {
  162                                 error = ENOENT;
  163                                 break;
  164                         }
  165                         stats = &((hinfo_p)NG_HOOK_PRIVATE(hook))->stats;
  166                         /* Build response (if desired). */
  167                         if (msg->header.cmd != NGM_HOLE_CLR_STATS) {
  168                                 NG_MKRESPONSE(resp, msg, sizeof(*stats),
  169                                     M_NOWAIT);
  170                                 if (resp == NULL) {
  171                                         error = ENOMEM;
  172                                         break;
  173                                 }
  174                                 bcopy(stats, resp->data, sizeof(*stats));
  175                         }
  176                         /* Clear stats (if desired). */
  177                         if (msg->header.cmd != NGM_HOLE_GET_STATS)
  178                                 bzero(stats, sizeof(*stats));
  179                         break;
  180                 default:                /* Unknown command. */
  181                         error = EINVAL;
  182                         break;
  183                 }
  184                 break;
  185         default:                        /* Unknown type cookie. */
  186                 error = EINVAL;
  187                 break;
  188         }
  189         NG_RESPOND_MSG(error, node, retaddr, resp, rptr);
  190         NG_FREE_MSG(msg);
  191         return (error);
  192 }
  193 
  194 /*
  195  * Receive data
  196  */
  197 static int
  198 ngh_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
  199 {
  200         const hinfo_p hip = NG_HOOK_PRIVATE(hook);
  201 
  202         hip->stats.frames++;
  203         hip->stats.octets += m->m_pkthdr.len;
  204         NG_FREE_DATA(m, meta);
  205         return 0;
  206 }
  207 
  208 /*
  209  * Hook disconnection
  210  */
  211 static int
  212 ngh_disconnect(hook_p hook)
  213 {
  214 
  215         FREE(NG_HOOK_PRIVATE(hook), M_NETGRAPH);
  216         NG_HOOK_SET_PRIVATE(hook, NULL);
  217         if (hook->node->numhooks == 0)
  218                 ng_rmnode(hook->node);
  219         return (0);
  220 }

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

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