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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 "ether_echo" node
47 * This node simply bounces data and messages back to whence they came.
48 * However it swaps the source and destination ether fields.
52 #include <sys/param.h>
53 #include <sys/systm.h>
54 #include <sys/kernel.h>
55 #include <sys/malloc.h>
57 #include <netgraph/ng_message.h>
58 #include <netgraph/netgraph.h>
59 #include <netgraph/ng_ether_echo.h>
61 #include <net/ethernet.h>
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;
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,
78 NETGRAPH_INIT(ether_echo, &typestruct);
81 ngee_cons(node_p node)
87 * Receive control message. We just bounce it back as a reply.
90 ngee_rcvmsg(node_p node, item_p item, hook_p lasthook)
95 NGI_GET_MSG(item, msg);
96 msg->header.flags |= NGF_RESP;
97 NG_RESPOND_MSG(error, node, item, msg);
105 ngee_rcvdata(hook_p hook, item_p item)
110 struct ether_header *eh;
111 struct ether_addr tmpaddr;
113 /* Make sure we have an entire header */
115 if (m->m_len < sizeof(*eh) ) {
116 m = m_pullup(m, sizeof(*eh));
122 eh = mtod(m, struct ether_header *);
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);
129 NG_FWD_NEW_DATA(error, item, hook, m);
134 * Removal of the last link destroys the nodeo
137 ngee_disconnect(hook_p hook)
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));