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 */
92 static ng_constructor_t ngipi_cons;
93 static ng_rcvdata_t ngipi_rcvdata;
94 static ng_disconnect_t ngipi_disconnect;
95
96 static 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 };
103 NETGRAPH_INIT(ip_input, &typestruct);
104
105 /*
106 * Be obliging. but no work to do.
107 */
108 static int
ngipi_cons(node_p node)109 ngipi_cons(node_p node)
110 {
111 return(0);
112 }
113
114 /*
115 * Receive data
116 */
117 static int
ngipi_rcvdata(hook_p hook,item_p item)118 ngipi_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 */
139 static int
ngipi_disconnect(hook_p hook)140 ngipi_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