sys/netgraph7/ng_ip_input.c

   1 /*
   2  * ng_ip_input.c
   3  */
   4
   5 /*-
   6  * Copyright 2001 The Aerospace Corporation.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1.  Redistributions of source code must retain the above copyright
  13  *     notice, this list of conditions, and the following disclaimer.
  14  * 2.  Redistributions in binary form must reproduce the above copyright
  15  *     notice, this list of conditions, and the following disclaimer in the
  16  *     documentation and/or other materials provided with the distribution.
  17  * 3.  The name of The Aerospace Corporation may not be used to endorse or
  18  *     promote products derived from this software.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION "AS IS" AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AEROSPACE CORPORATION BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * Copyright (c) 1996-1999 Whistle Communications, Inc.
  33  * All rights reserved.
  34  *
  35  * Subject to the following obligations and disclaimer of warranty, use and
  36  * redistribution of this software, in source or object code forms, with or
  37  * without modifications are expressly permitted by Whistle Communications;
  38  * provided, however, that:
  39  * 1. Any and all reproductions of the source or object code must include the
  40  *    copyright notice above and the following disclaimer of warranties; and
  41  * 2. No rights are granted, in any manner or form, to use Whistle
  42  *    Communications, Inc. trademarks, including the mark "WHISTLE
  43  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
  44  *    such appears in the above copyright notice or in the software.
  45  *
  46  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
  47  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
  48  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
  49  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
  50  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
  51  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
  52  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
  53  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
  54  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
  55  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
  56  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  57  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
  58  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
  59  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  60  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  61  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
  62  * OF SUCH DAMAGE.
  63  *
  64  * Author:              Brooks Davis <brooks@FreeBSD.org>
  65  * Derived from:        ng_hole.c
  66  *
  67  * $FreeBSD: src/sys/netgraph/ng_ip_input.c,v 1.4 2005/01/07 01:45:39 imp Exp $
  68  */
  69
  70 /*
  71  * This node simply takes IP packets and calls ip_input on them
  72  */
  73
  74 #include <sys/param.h>
  75 #include <sys/systm.h>
  76 #include <sys/kernel.h>
  77 #include <sys/malloc.h>
  78 #include <sys/mbuf.h>
  79 #include <sys/socket.h>
  80 #include <net/if.h>
  81 #include <net/if_types.h>
  82 #include <net/if_var.h>
  83 #include <netinet/in.h>
  84 #include <netinet/in_var.h>
  85 #include <net/netisr.h>
  86 #include <netgraph/ng_message.h>
  87 #include <netgraph/netgraph.h>
  88 #include <netgraph/ng_ip_input.h>
  89
  90 /* Netgraph methods */
  91 static ng_constructor_t ngipi_cons;
  92 static ng_rcvdata_t     ngipi_rcvdata;
  93 static ng_disconnect_t  ngipi_disconnect;
  94
  95 static struct ng_type typestruct = {
  96         .version =      NG_ABI_VERSION,
  97         .name =         NG_IP_INPUT_NODE_TYPE,
  98         .constructor =  ngipi_cons,
  99         .rcvdata =      ngipi_rcvdata,
 100         .disconnect =   ngipi_disconnect,
 101 };
 102 NETGRAPH_INIT(ip_input, &typestruct);
 103
 104 /*
 105  * Be obliging. but no work to do.
 106  */
 107 static int
 108 ngipi_cons(node_p node)
 109 {
 110         return(0);
 111 }
 112
 113 /*
 114  * Receive data
 115  */
 116 static int
 117 ngipi_rcvdata(hook_p hook, item_p item)
 118 {
 119         struct mbuf *m;
 120
 121         NGI_GET_M(item, m);
 122         NG_FREE_ITEM(item);
 123         netisr_dispatch(NETISR_IP, m);
 124         return 0;
 125 }
 126
 127 /*
 128  * Hook disconnection
 129  */
 130 static int
 131 ngipi_disconnect(hook_p hook)
 132 {
 133         if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
 134                 ng_rmnode_self(NG_HOOK_NODE(hook));
 135         return (0);
 136 }