1 /*
2 * ng_ether_echo.c
3 */
4
5 /*-
6 * Copyright (c) 1996-1999 Whistle Communications, Inc.
7 * All rights reserved.
8 *
9 * Subject to the following obligations and disclaimer of warranty, use and
10 * redistribution of this software, in source or object code forms, with or
11 * without modifications are expressly permitted by Whistle Communications;
12 * provided, however, that:
13 * 1. Any and all reproductions of the source or object code must include the
14 * copyright notice above and the following disclaimer of warranties; and
15 * 2. No rights are granted, in any manner or form, to use Whistle
16 * Communications, Inc. trademarks, including the mark "WHISTLE
17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
18 * such appears in the above copyright notice or in the software.
19 *
20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
36 * OF SUCH DAMAGE.
37 *
38 * Author: Julian Elisher <julian@freebsd.org>
39 *
40 * $FreeBSD: releng/10.3/sys/netgraph/ng_ether_echo.c 186481 2008-12-25 00:01:29Z julian $
41 * $Whistle: ng_echo.c,v 1.13 1999/11/01 09:24:51 julian Exp $
42 */
43
44 /*
45 * Netgraph "ether_echo" node
46 *
47 * This node simply bounces data and messages back to whence they came.
48 * However it swaps the source and destination ether fields.
49 * No testing is done!
50 */
51
52 #include <sys/param.h>
53 #include <sys/systm.h>
54 #include <sys/kernel.h>
55 #include <sys/malloc.h>
56 #include <sys/mbuf.h>
57 #include <netgraph/ng_message.h>
58 #include <netgraph/netgraph.h>
59 #include <netgraph/ng_ether_echo.h>
60
61 #include <net/ethernet.h>
62
63 /* Netgraph methods */
64 static ng_constructor_t ngee_cons;
65 static ng_rcvmsg_t ngee_rcvmsg;
66 static ng_rcvdata_t ngee_rcvdata;
67 static ng_disconnect_t ngee_disconnect;
68
69 /* Netgraph type */
70 static struct ng_type typestruct = {
71 .version = NG_ABI_VERSION,
72 .name = NG_ETHER_ECHO_NODE_TYPE,
73 .constructor = ngee_cons,
74 .rcvmsg = ngee_rcvmsg,
75 .rcvdata = ngee_rcvdata,
76 .disconnect = ngee_disconnect,
77 };
78 NETGRAPH_INIT(ether_echo, &typestruct);
79
80 static int
81 ngee_cons(node_p node)
82 {
83 return (0);
84 }
85
86 /*
87 * Receive control message. We just bounce it back as a reply.
88 */
89 static int
90 ngee_rcvmsg(node_p node, item_p item, hook_p lasthook)
91 {
92 struct ng_mesg *msg;
93 int error = 0;
94
95 NGI_GET_MSG(item, msg);
96 msg->header.flags |= NGF_RESP;
97 NG_RESPOND_MSG(error, node, item, msg);
98 return (error);
99 }
100
101 /*
102 * Receive data
103 */
104 static int
105 ngee_rcvdata(hook_p hook, item_p item)
106 {
107 int error;
108 struct mbuf *m;
109
110 struct ether_header *eh;
111 struct ether_addr tmpaddr;
112
113 /* Make sure we have an entire header */
114 NGI_GET_M(item, m);
115 if (m->m_len < sizeof(*eh) ) {
116 m = m_pullup(m, sizeof(*eh));
117 if (m == NULL) {
118 NG_FREE_ITEM(item);
119 return(EINVAL);
120 }
121 }
122 eh = mtod(m, struct ether_header *);
123
124 /* swap the source and destination fields */
125 bcopy(eh->ether_dhost, &tmpaddr, ETHER_ADDR_LEN);
126 bcopy(eh->ether_shost, eh->ether_dhost, ETHER_ADDR_LEN);
127 bcopy(&tmpaddr, eh->ether_shost, ETHER_ADDR_LEN);
128
129 NG_FWD_NEW_DATA(error, item, hook, m);
130 return (error);
131 }
132
133 /*
134 * Removal of the last link destroys the nodeo
135 */
136 static int
137 ngee_disconnect(hook_p hook)
138 {
139 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
140 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
141 ng_rmnode_self(NG_HOOK_NODE(hook));
142 }
143 return (0);
144 }
145
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