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 1.6 2008/07/08 20:19:43 gonzo 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 }
137
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