1
2 /*
3 * ng_hole.c
4 *
5 * Copyright (c) 1996-1999 Whistle Communications, Inc.
6 * All rights reserved.
7 *
8 * Subject to the following obligations and disclaimer of warranty, use and
9 * redistribution of this software, in source or object code forms, with or
10 * without modifications are expressly permitted by Whistle Communications;
11 * provided, however, that:
12 * 1. Any and all reproductions of the source or object code must include the
13 * copyright notice above and the following disclaimer of warranties; and
14 * 2. No rights are granted, in any manner or form, to use Whistle
15 * Communications, Inc. trademarks, including the mark "WHISTLE
16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
17 * such appears in the above copyright notice or in the software.
18 *
19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
35 * OF SUCH DAMAGE.
36 *
37 * Author: Julian Elisher <julian@freebsd.org>
38 *
39 * $FreeBSD: releng/5.3/sys/netgraph/ng_hole.c 136588 2004-10-16 08:43:07Z cvs2svn $
40 * $Whistle: ng_hole.c,v 1.10 1999/11/01 09:24:51 julian Exp $
41 */
42
43 /*
44 * This node is a 'black hole' that simply discards everything it receives
45 */
46
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/kernel.h>
50 #include <sys/malloc.h>
51 #include <sys/mbuf.h>
52 #include <netgraph/ng_message.h>
53 #include <netgraph/netgraph.h>
54 #include <netgraph/ng_parse.h>
55 #include <netgraph/ng_hole.h>
56
57 /* Per hook private info. */
58 struct ng_hole_hookinfo {
59 struct ng_hole_hookstat stats;
60 };
61 typedef struct ng_hole_hookinfo *hinfo_p;
62
63 /* Parse type for struct ng_hole_hookstat. */
64 static const struct ng_parse_struct_field ng_hole_hookstat_type_fields[] =
65 NG_HOLE_HOOKSTAT_TYPE_INFO;
66 static const struct ng_parse_type ng_hole_hookstat_type = {
67 &ng_parse_struct_type,
68 &ng_hole_hookstat_type_fields
69 };
70
71 /* List of commands and how to convert arguments to/from ASCII. */
72 static const struct ng_cmdlist ng_hole_cmdlist[] = {
73 {
74 NGM_HOLE_COOKIE,
75 NGM_HOLE_GET_STATS,
76 "getstats",
77 &ng_parse_hookbuf_type,
78 &ng_hole_hookstat_type
79 },
80 {
81 NGM_HOLE_COOKIE,
82 NGM_HOLE_CLR_STATS,
83 "clrstats",
84 &ng_parse_hookbuf_type,
85 NULL
86 },
87 {
88 NGM_HOLE_COOKIE,
89 NGM_HOLE_GETCLR_STATS,
90 "getclrstats",
91 &ng_parse_hookbuf_type,
92 &ng_hole_hookstat_type
93 },
94 { 0 }
95 };
96
97 /* Netgraph methods */
98 static ng_constructor_t ngh_cons;
99 static ng_rcvmsg_t ngh_rcvmsg;
100 static ng_newhook_t ngh_newhook;
101 static ng_rcvdata_t ngh_rcvdata;
102 static ng_disconnect_t ngh_disconnect;
103
104 static struct ng_type typestruct = {
105 .version = NG_ABI_VERSION,
106 .name = NG_HOLE_NODE_TYPE,
107 .constructor = ngh_cons,
108 .rcvmsg = ngh_rcvmsg,
109 .newhook = ngh_newhook,
110 .rcvdata = ngh_rcvdata,
111 .disconnect = ngh_disconnect,
112 .cmdlist = ng_hole_cmdlist,
113 };
114 NETGRAPH_INIT(hole, &typestruct);
115
116 /*
117 * Be obliging. but no work to do.
118 */
119 static int
120 ngh_cons(node_p node)
121 {
122 return(0);
123 }
124
125 /*
126 * Add a hook.
127 */
128 static int
129 ngh_newhook(node_p node, hook_p hook, const char *name)
130 {
131 hinfo_p hip;
132
133 /* Create hook private structure. */
134 MALLOC(hip, hinfo_p, sizeof(*hip), M_NETGRAPH, M_NOWAIT | M_ZERO);
135 if (hip == NULL)
136 return (ENOMEM);
137 NG_HOOK_SET_PRIVATE(hook, hip);
138 return (0);
139 }
140
141 /*
142 * Receive a control message.
143 */
144 static int
145 ngh_rcvmsg(node_p node, item_p item, hook_p lasthook)
146 {
147 struct ng_mesg *msg;
148 struct ng_mesg *resp = NULL;
149 int error = 0;
150 struct ng_hole_hookstat *stats;
151 hook_p hook;
152
153 NGI_GET_MSG(item, msg);
154 switch (msg->header.typecookie) {
155 case NGM_HOLE_COOKIE:
156 switch (msg->header.cmd) {
157 case NGM_HOLE_GET_STATS:
158 case NGM_HOLE_CLR_STATS:
159 case NGM_HOLE_GETCLR_STATS:
160 /* Sanity check. */
161 if (msg->header.arglen != NG_HOOKSIZ) {
162 error = EINVAL;
163 break;
164 }
165 /* Find hook. */
166 hook = ng_findhook(node, (char *)msg->data);
167 if (hook == NULL) {
168 error = ENOENT;
169 break;
170 }
171 stats = &((hinfo_p)NG_HOOK_PRIVATE(hook))->stats;
172 /* Build response (if desired). */
173 if (msg->header.cmd != NGM_HOLE_CLR_STATS) {
174 NG_MKRESPONSE(resp, msg, sizeof(*stats),
175 M_NOWAIT);
176 if (resp == NULL) {
177 error = ENOMEM;
178 break;
179 }
180 bcopy(stats, resp->data, sizeof(*stats));
181 }
182 /* Clear stats (if desired). */
183 if (msg->header.cmd != NGM_HOLE_GET_STATS)
184 bzero(stats, sizeof(*stats));
185 break;
186 default: /* Unknown command. */
187 error = EINVAL;
188 break;
189 }
190 break;
191 default: /* Unknown type cookie. */
192 error = EINVAL;
193 break;
194 }
195 NG_RESPOND_MSG(error, node, item, resp);
196 NG_FREE_MSG(msg);
197 return (error);
198 }
199
200 /*
201 * Receive data
202 */
203 static int
204 ngh_rcvdata(hook_p hook, item_p item)
205 {
206 const hinfo_p hip = NG_HOOK_PRIVATE(hook);
207
208 hip->stats.frames++;
209 hip->stats.octets += NGI_M(item)->m_pkthdr.len;
210 NG_FREE_ITEM(item);
211 return 0;
212 }
213
214 /*
215 * Hook disconnection
216 */
217 static int
218 ngh_disconnect(hook_p hook)
219 {
220
221 NG_HOOK_SET_PRIVATE(hook, NULL);
222 if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
223 ng_rmnode_self(NG_HOOK_NODE(hook));
224 return (0);
225 }
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