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/5.3/sys/netgraph/ng_ip_input.c 136588 2004-10-16 08:43:07Z cvs2svn $
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 .version = NG_ABI_VERSION,
95 .name = NG_IP_INPUT_NODE_TYPE,
96 .constructor = ngipi_cons,
97 .rcvdata = ngipi_rcvdata,
98 .disconnect = ngipi_disconnect,
99 };
100 NETGRAPH_INIT(ip_input, &typestruct);
101
102 /*
103 * Be obliging. but no work to do.
104 */
105 static int
106 ngipi_cons(node_p node)
107 {
108 return(0);
109 }
110
111 /*
112 * Receive data
113 */
114 static int
115 ngipi_rcvdata(hook_p hook, item_p item)
116 {
117 struct mbuf *m;
118
119 NGI_GET_M(item, m);
120 NG_FREE_ITEM(item);
121 netisr_dispatch(NETISR_IP, m);
122 return 0;
123 }
124
125 /*
126 * Hook disconnection
127 */
128 static int
129 ngipi_disconnect(hook_p hook)
130 {
131 if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
132 ng_rmnode_self(NG_HOOK_NODE(hook));
133 return (0);
134 }
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