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38 * Author: Julian Elisher <julian@freebsd.org>
41 * $Whistle: ng_echo.c,v 1.13 1999/11/01 09:24:51 julian Exp $
45 * Netgraph "echo" node
47 * This node simply bounces data and messages back to whence they came.
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/kernel.h>
53 #include <sys/malloc.h>
55 #include <netgraph/ng_message.h>
56 #include <netgraph/netgraph.h>
57 #include <netgraph/ng_echo.h>
59 /* Netgraph methods */
60 static ng_constructor_t nge_cons;
61 static ng_rcvmsg_t nge_rcvmsg;
62 static ng_rcvdata_t nge_rcvdata;
63 static ng_disconnect_t nge_disconnect;
66 static struct ng_type typestruct = {
67 .version = NG_ABI_VERSION,
68 .name = NG_ECHO_NODE_TYPE,
69 .constructor = nge_cons,
71 .rcvdata = nge_rcvdata,
72 .disconnect = nge_disconnect,
74 NETGRAPH_INIT(echo, &typestruct);
83 * Receive control message. We just bounce it back as a reply.
86 nge_rcvmsg(node_p node, item_p item, hook_p lasthook)
91 NGI_GET_MSG(item, msg);
92 msg->header.flags |= NGF_RESP;
93 NG_RESPOND_MSG(error, node, item, msg);
101 nge_rcvdata(hook_p hook, item_p item)
105 NG_FWD_ITEM_HOOK(error, item, hook);
110 * Removal of the last link destroys the nodeo
113 nge_disconnect(hook_p hook)
115 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
116 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
117 ng_rmnode_self(NG_HOOK_NODE(hook));