1/*-
2 * Copyright (c) 2009 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27/*
28 * When an interface has been detached but not yet freed, we set the various
29 * ifnet function pointers to "ifdead" versions.  This prevents unexpected
30 * calls from the network stack into the device driver after if_detach() has
31 * returned.
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD$");
36
37#include <sys/param.h>
38#include <sys/mbuf.h>
39#include <sys/socket.h>
40
41#include <net/if.h>
42#include <net/if_var.h>
43
44static int
45ifdead_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa,
46    struct route *ro)
47{
48
49	m_freem(m);
50	return (ENXIO);
51}
52
53static void
54ifdead_input(struct ifnet *ifp, struct mbuf *m)
55{
56
57	m_freem(m);
58}
59
60static void
61ifdead_start(struct ifnet *ifp)
62{
63
64}
65
66static int
67ifdead_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
68{
69
70	return (ENXIO);
71}
72
73static int
74ifdead_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
75    struct sockaddr *sa)
76{
77
78	*llsa = NULL;
79	return (ENXIO);
80}
81
82static void
83ifdead_qflush(struct ifnet *ifp)
84{
85
86}
87
88static int
89ifdead_transmit(struct ifnet *ifp, struct mbuf *m)
90{
91
92	m_freem(m);
93	return (ENXIO);
94}
95
96static uint64_t
97ifdead_get_counter(struct ifnet *ifp, ift_counter cnt)
98{
99
100	return (0);
101}
102
103void
104if_dead(struct ifnet *ifp)
105{
106
107	ifp->if_output = ifdead_output;
108	ifp->if_input = ifdead_input;
109	ifp->if_start = ifdead_start;
110	ifp->if_ioctl = ifdead_ioctl;
111	ifp->if_resolvemulti = ifdead_resolvemulti;
112	ifp->if_qflush = ifdead_qflush;
113	ifp->if_transmit = ifdead_transmit;
114	ifp->if_get_counter = ifdead_get_counter;
115}
116