xref: /freebsd/sys/netgraph/ng_ip_input.c (revision 3642298923e528d795e3a30ec165d2b469e28b40)
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  * $FreeBSD$
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