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

     /*
      * ng_ip_input.c
      *
      * Copyright 2001 The Aerospace Corporation.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      *
     * 1.  Redistributions of source code must retain the above copyright
     *     notice, this list of conditions, and the following disclaimer.
     * 2.  Redistributions in binary form must reproduce the above copyright
     *     notice, this list of conditions, and the following disclaimer in the
     *     documentation and/or other materials provided with the distribution.
     * 3.  The name of The Aerospace Corporation may not be used to endorse or
     *     promote products derived from this software.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION "AS IS" AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AEROSPACE CORPORATION BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * Copyright (c) 1996-1999 Whistle Communications, Inc.
     * All rights reserved.
     * 
     * Subject to the following obligations and disclaimer of warranty, use and
     * redistribution of this software, in source or object code forms, with or
     * without modifications are expressly permitted by Whistle Communications;
     * provided, however, that:
     * 1. Any and all reproductions of the source or object code must include the
     *    copyright notice above and the following disclaimer of warranties; and
     * 2. No rights are granted, in any manner or form, to use Whistle
     *    Communications, Inc. trademarks, including the mark "WHISTLE
     *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
     *    such appears in the above copyright notice or in the software.
     * 
     * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
     * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
     * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
     * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
     * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
     * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
     * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
     * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
     * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
     * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
     * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
     * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
     * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
     * OF SUCH DAMAGE.
     *
     * Author:              Brooks Davis <brooks@FreeBSD.org>
     * Derived from:        ng_hole.c
     *
     * $FreeBSD: releng/5.2/sys/netgraph/ng_ip_input.c 111888 2003-03-04 23:19:55Z jlemon $
     */
    
    /*
     * This node simply takes IP packets and calls ip_input on them
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/mbuf.h>
    #include <sys/socket.h>
    #include <net/if.h>
    #include <net/if_types.h>
    #include <net/if_var.h>
    #include <netinet/in.h>
    #include <netinet/in_var.h>
    #include <net/netisr.h>
    #include <netgraph/ng_message.h>
    #include <netgraph/netgraph.h>
    #include <netgraph/ng_ip_input.h>
    
    /* Netgraph methods */
    static ng_constructor_t ngipi_cons;
    static ng_rcvdata_t     ngipi_rcvdata;
    static ng_disconnect_t  ngipi_disconnect;
    
    static struct ng_type typestruct = {
            NG_ABI_VERSION,
            NG_IP_INPUT_NODE_TYPE,
            NULL,           /* modeventhand_t */
            ngipi_cons,     /* ng_constructor_t */
            NULL,           /* ng_rcvmsg_t */
            NULL,           /* ng_shutdown_t */
           NULL,           /* ng_newhook_t */
           NULL,           /* ng_findhook_t */
           NULL,           /* ng_connect_t */
           ngipi_rcvdata,  /* ng_rcvdata_t */
           ngipi_disconnect, /* ng_disconnect_t */
           NULL            /* ng_cmdlist */
   };
   NETGRAPH_INIT(ip_input, &typestruct);
   
   /* 
    * Be obliging. but no work to do.
    */
   static int
   ngipi_cons(node_p node)
   {
           return(0);
   }
   
   /*
    * Receive data
    */
   static int
   ngipi_rcvdata(hook_p hook, item_p item)
   {
           struct mbuf *m;
   
           NGI_GET_M(item, m);
           NG_FREE_ITEM(item);
           netisr_dispatch(NETISR_IP, m);
           return 0;
   }
   
   /*
    * Hook disconnection
    */
   static int
   ngipi_disconnect(hook_p hook)
   {
           if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
                   ng_rmnode_self(NG_HOOK_NODE(hook));
           return (0);
   }

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