1/*
2 * ng_ip_input.c
3 */
4
5/*-
6 * SPDX-License-Identifier: BSD-3-Clause AND BSD-2-Clause
7 *
8 * Copyright 2001 The Aerospace Corporation.  All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1.  Redistributions of source code must retain the above copyright
15 *     notice, this list of conditions, and the following disclaimer.
16 * 2.  Redistributions in binary form must reproduce the above copyright
17 *     notice, this list of conditions, and the following disclaimer in the
18 *     documentation and/or other materials provided with the distribution.
19 * 3.  The name of The Aerospace Corporation may not be used to endorse or
20 *     promote products derived from this software.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION "AS IS" AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AEROSPACE CORPORATION BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * Copyright (c) 1996-1999 Whistle Communications, Inc.
35 * All rights reserved.
36 *
37 * Subject to the following obligations and disclaimer of warranty, use and
38 * redistribution of this software, in source or object code forms, with or
39 * without modifications are expressly permitted by Whistle Communications;
40 * provided, however, that:
41 * 1. Any and all reproductions of the source or object code must include the
42 *    copyright notice above and the following disclaimer of warranties; and
43 * 2. No rights are granted, in any manner or form, to use Whistle
44 *    Communications, Inc. trademarks, including the mark "WHISTLE
45 *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
46 *    such appears in the above copyright notice or in the software.
47 *
48 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
49 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
50 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
51 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
52 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
53 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
54 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
55 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
56 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
57 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
58 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
59 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
60 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
61 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
62 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
63 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
64 * OF SUCH DAMAGE.
65 *
66 * Author:		Brooks Davis <brooks@FreeBSD.org>
67 * Derived from:	ng_hole.c
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 <sys/proc.h>
81#include <net/if.h>
82#include <net/if_types.h>
83#include <net/if_var.h>
84#include <netinet/in.h>
85#include <netinet/in_var.h>
86#include <net/netisr.h>
87#include <netgraph/ng_message.h>
88#include <netgraph/netgraph.h>
89#include <netgraph/ng_ip_input.h>
90
91/* Netgraph methods */
92static ng_constructor_t	ngipi_cons;
93static ng_rcvdata_t	ngipi_rcvdata;
94static ng_disconnect_t	ngipi_disconnect;
95
96static struct ng_type typestruct = {
97	.version =	NG_ABI_VERSION,
98	.name =		NG_IP_INPUT_NODE_TYPE,
99	.constructor =	ngipi_cons,
100	.rcvdata =	ngipi_rcvdata,
101	.disconnect =	ngipi_disconnect,
102};
103NETGRAPH_INIT(ip_input, &typestruct);
104
105/*
106 * Be obliging. but no work to do.
107 */
108static int
109ngipi_cons(node_p node)
110{
111	return(0);
112}
113
114/*
115 * Receive data
116 */
117static int
118ngipi_rcvdata(hook_p hook, item_p item)
119{
120	struct mbuf *m;
121
122	NGI_GET_M(item, m);
123	NG_FREE_ITEM(item);
124	if (curthread->td_ng_outbound)
125		netisr_queue(NETISR_IP, m);
126	else {
127		struct epoch_tracker et;
128
129		NET_EPOCH_ENTER(et);
130		netisr_dispatch(NETISR_IP, m);
131		NET_EPOCH_EXIT(et);
132	}
133	return 0;
134}
135
136/*
137 * Hook disconnection
138 */
139static int
140ngipi_disconnect(hook_p hook)
141{
142	if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
143		ng_rmnode_self(NG_HOOK_NODE(hook));
144	return (0);
145}
146