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_ip_input.c

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    1 /*
    2  * ng_ip_input.c
    3  *
    4  * Copyright 2001 The Aerospace Corporation.  All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  *
   10  * 1.  Redistributions of source code must retain the above copyright
   11  *     notice, this list of conditions, and the following disclaimer.
   12  * 2.  Redistributions in binary form must reproduce the above copyright
   13  *     notice, this list of conditions, and the following disclaimer in the
   14  *     documentation and/or other materials provided with the distribution.
   15  * 3.  The name of The Aerospace Corporation may not be used to endorse or
   16  *     promote products derived from this software.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION "AS IS" AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AEROSPACE CORPORATION BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  * Copyright (c) 1996-1999 Whistle Communications, Inc.
   31  * All rights reserved.
   32  * 
   33  * Subject to the following obligations and disclaimer of warranty, use and
   34  * redistribution of this software, in source or object code forms, with or
   35  * without modifications are expressly permitted by Whistle Communications;
   36  * provided, however, that:
   37  * 1. Any and all reproductions of the source or object code must include the
   38  *    copyright notice above and the following disclaimer of warranties; and
   39  * 2. No rights are granted, in any manner or form, to use Whistle
   40  *    Communications, Inc. trademarks, including the mark "WHISTLE
   41  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
   42  *    such appears in the above copyright notice or in the software.
   43  * 
   44  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
   45  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
   46  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
   47  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
   48  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
   49  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
   50  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
   51  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
   52  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
   53  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
   54  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
   55  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
   56  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
   57  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   58  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   59  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
   60  * OF SUCH DAMAGE.
   61  *
   62  * Author:              Brooks Davis <brooks@FreeBSD.org>
   63  * Derived from:        ng_hole.c
   64  *
   65  * $FreeBSD: releng/5.1/sys/netgraph/ng_ip_input.c 111888 2003-03-04 23:19:55Z jlemon $
   66  */
   67 
   68 /*
   69  * This node simply takes IP packets and calls ip_input on them
   70  */
   71 
   72 #include <sys/param.h>
   73 #include <sys/systm.h>
   74 #include <sys/kernel.h>
   75 #include <sys/malloc.h>
   76 #include <sys/mbuf.h>
   77 #include <sys/socket.h>
   78 #include <net/if.h>
   79 #include <net/if_types.h>
   80 #include <net/if_var.h>
   81 #include <netinet/in.h>
   82 #include <netinet/in_var.h>
   83 #include <net/netisr.h>
   84 #include <netgraph/ng_message.h>
   85 #include <netgraph/netgraph.h>
   86 #include <netgraph/ng_ip_input.h>
   87 
   88 /* Netgraph methods */
   89 static ng_constructor_t ngipi_cons;
   90 static ng_rcvdata_t     ngipi_rcvdata;
   91 static ng_disconnect_t  ngipi_disconnect;
   92 
   93 static struct ng_type typestruct = {
   94         NG_ABI_VERSION,
   95         NG_IP_INPUT_NODE_TYPE,
   96         NULL,           /* modeventhand_t */
   97         ngipi_cons,     /* ng_constructor_t */
   98         NULL,           /* ng_rcvmsg_t */
   99         NULL,           /* ng_shutdown_t */
  100         NULL,           /* ng_newhook_t */
  101         NULL,           /* ng_findhook_t */
  102         NULL,           /* ng_connect_t */
  103         ngipi_rcvdata,  /* ng_rcvdata_t */
  104         ngipi_disconnect, /* ng_disconnect_t */
  105         NULL            /* ng_cmdlist */
  106 };
  107 NETGRAPH_INIT(ip_input, &typestruct);
  108 
  109 /* 
  110  * Be obliging. but no work to do.
  111  */
  112 static int
  113 ngipi_cons(node_p node)
  114 {
  115         return(0);
  116 }
  117 
  118 /*
  119  * Receive data
  120  */
  121 static int
  122 ngipi_rcvdata(hook_p hook, item_p item)
  123 {
  124         struct mbuf *m;
  125 
  126         NGI_GET_M(item, m);
  127         NG_FREE_ITEM(item);
  128         netisr_dispatch(NETISR_IP, m);
  129         return 0;
  130 }
  131 
  132 /*
  133  * Hook disconnection
  134  */
  135 static int
  136 ngipi_disconnect(hook_p hook)
  137 {
  138         if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
  139                 ng_rmnode_self(NG_HOOK_NODE(hook));
  140         return (0);
  141 }

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