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

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    1 /*
    2  * ng_hole.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 Elisher <julian@freebsd.org>
   39  *
   40  * $FreeBSD: stable/8/sys/netgraph/ng_hole.c 199583 2009-11-20 15:27:52Z jhb $
   41  * $Whistle: ng_hole.c,v 1.10 1999/11/01 09:24:51 julian Exp $
   42  */
   43 
   44 /*
   45  * This node is a 'black hole' that simply discards everything it receives
   46  */
   47 
   48 #include <sys/param.h>
   49 #include <sys/systm.h>
   50 #include <sys/kernel.h>
   51 #include <sys/malloc.h>
   52 #include <sys/mbuf.h>
   53 #include <netgraph/ng_message.h>
   54 #include <netgraph/netgraph.h>
   55 #include <netgraph/ng_parse.h>
   56 #include <netgraph/ng_hole.h>
   57 
   58 /* Per hook private info. */
   59 struct ng_hole_hookinfo {
   60         struct ng_hole_hookstat stats;
   61 };
   62 typedef struct ng_hole_hookinfo *hinfo_p;
   63 
   64 /* Parse type for struct ng_hole_hookstat. */
   65 static const struct ng_parse_struct_field ng_hole_hookstat_type_fields[] =
   66         NG_HOLE_HOOKSTAT_TYPE_INFO;
   67 static const struct ng_parse_type ng_hole_hookstat_type = {
   68         &ng_parse_struct_type,
   69         &ng_hole_hookstat_type_fields
   70 };
   71 
   72 /* List of commands and how to convert arguments to/from ASCII. */
   73 static const struct ng_cmdlist ng_hole_cmdlist[] = {
   74         {
   75           NGM_HOLE_COOKIE,
   76           NGM_HOLE_GET_STATS,
   77           "getstats",
   78           &ng_parse_hookbuf_type,
   79           &ng_hole_hookstat_type
   80         },
   81         {
   82           NGM_HOLE_COOKIE,
   83           NGM_HOLE_CLR_STATS,
   84           "clrstats",
   85           &ng_parse_hookbuf_type,
   86           NULL
   87         },
   88         {
   89           NGM_HOLE_COOKIE,
   90           NGM_HOLE_GETCLR_STATS,
   91           "getclrstats",
   92           &ng_parse_hookbuf_type,
   93           &ng_hole_hookstat_type
   94         },
   95         { 0 }
   96 };
   97 
   98 /* Netgraph methods */
   99 static ng_constructor_t ngh_cons;
  100 static ng_rcvmsg_t      ngh_rcvmsg;
  101 static ng_newhook_t     ngh_newhook;
  102 static ng_rcvdata_t     ngh_rcvdata;
  103 static ng_disconnect_t  ngh_disconnect;
  104 
  105 static struct ng_type typestruct = {
  106         .version =      NG_ABI_VERSION,
  107         .name =         NG_HOLE_NODE_TYPE,
  108         .constructor =  ngh_cons,
  109         .rcvmsg =       ngh_rcvmsg,
  110         .newhook =      ngh_newhook,
  111         .rcvdata =      ngh_rcvdata,
  112         .disconnect =   ngh_disconnect,
  113         .cmdlist =      ng_hole_cmdlist,
  114 };
  115 NETGRAPH_INIT(hole, &typestruct);
  116 
  117 /* 
  118  * Be obliging. but no work to do.
  119  */
  120 static int
  121 ngh_cons(node_p node)
  122 {
  123         return(0);
  124 }
  125 
  126 /*
  127  * Add a hook.
  128  */
  129 static int
  130 ngh_newhook(node_p node, hook_p hook, const char *name)
  131 {
  132         hinfo_p hip;
  133 
  134         /* Create hook private structure. */
  135         hip = malloc(sizeof(*hip), M_NETGRAPH, M_NOWAIT | M_ZERO);
  136         if (hip == NULL)
  137                 return (ENOMEM);
  138         NG_HOOK_SET_PRIVATE(hook, hip);
  139         return (0);
  140 }
  141 
  142 /*
  143  * Receive a control message.
  144  */
  145 static int
  146 ngh_rcvmsg(node_p node, item_p item, hook_p lasthook)
  147 {
  148         struct ng_mesg *msg;
  149         struct ng_mesg *resp = NULL;
  150         int error = 0;
  151         struct ng_hole_hookstat *stats;
  152         hook_p hook;
  153 
  154         NGI_GET_MSG(item, msg);
  155         switch (msg->header.typecookie) {
  156         case NGM_HOLE_COOKIE:
  157                 switch (msg->header.cmd) {
  158                 case NGM_HOLE_GET_STATS:
  159                 case NGM_HOLE_CLR_STATS:
  160                 case NGM_HOLE_GETCLR_STATS:
  161                         /* Sanity check. */
  162                         if (msg->header.arglen != NG_HOOKSIZ) {
  163                                 error = EINVAL;
  164                                 break;
  165                         }
  166                         /* Find hook. */
  167                         hook = ng_findhook(node, (char *)msg->data);
  168                         if (hook == NULL) {
  169                                 error = ENOENT;
  170                                 break;
  171                         }
  172                         stats = &((hinfo_p)NG_HOOK_PRIVATE(hook))->stats;
  173                         /* Build response (if desired). */
  174                         if (msg->header.cmd != NGM_HOLE_CLR_STATS) {
  175                                 NG_MKRESPONSE(resp, msg, sizeof(*stats),
  176                                     M_NOWAIT);
  177                                 if (resp == NULL) {
  178                                         error = ENOMEM;
  179                                         break;
  180                                 }
  181                                 bcopy(stats, resp->data, sizeof(*stats));
  182                         }
  183                         /* Clear stats (if desired). */
  184                         if (msg->header.cmd != NGM_HOLE_GET_STATS)
  185                                 bzero(stats, sizeof(*stats));
  186                         break;
  187                 default:                /* Unknown command. */
  188                         error = EINVAL;
  189                         break;
  190                 }
  191                 break;
  192         default:                        /* Unknown type cookie. */
  193                 error = EINVAL;
  194                 break;
  195         }
  196         NG_RESPOND_MSG(error, node, item, resp);
  197         NG_FREE_MSG(msg);
  198         return (error);
  199 }
  200 
  201 /*
  202  * Receive data
  203  */
  204 static int
  205 ngh_rcvdata(hook_p hook, item_p item)
  206 {
  207         const hinfo_p hip = NG_HOOK_PRIVATE(hook);
  208 
  209         hip->stats.frames++;
  210         hip->stats.octets += NGI_M(item)->m_pkthdr.len;
  211         NG_FREE_ITEM(item);
  212         return 0;
  213 }
  214 
  215 /*
  216  * Hook disconnection
  217  */
  218 static int
  219 ngh_disconnect(hook_p hook)
  220 {
  221 
  222         free(NG_HOOK_PRIVATE(hook), M_NETGRAPH);
  223         NG_HOOK_SET_PRIVATE(hook, NULL);
  224         if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  225                 ng_rmnode_self(NG_HOOK_NODE(hook));
  226         return (0);
  227 }

Cache object: 61eb800d43416ecd722c2b3a19450e0b


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