1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2009 Robert N. M. Watson
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29/*
30 * When an interface has been detached but not yet freed, we set the various
31 * ifnet function pointers to "ifdead" versions.  This prevents unexpected
32 * calls from the network stack into the device driver after if_detach() has
33 * returned.
34 */
35
36#include <sys/param.h>
37#include <sys/mbuf.h>
38#include <sys/socket.h>
39
40#include <net/if.h>
41#include <net/if_var.h>
42#include <net/if_private.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
103static int
104ifdead_snd_tag_alloc(struct ifnet *ifp, union if_snd_tag_alloc_params *params,
105    struct m_snd_tag **ppmt)
106{
107	return (EOPNOTSUPP);
108}
109
110static void
111ifdead_ratelimit_query(struct ifnet *ifp __unused,
112      struct if_ratelimit_query_results *q)
113{
114	/*
115	 * This guy does not support
116	 * this interface. Not sure
117	 * why we would specify a
118	 * flag on the interface
119	 * that says we do.
120	 */
121	q->rate_table = NULL;
122	q->flags = RT_NOSUPPORT;
123	q->max_flows = 0;
124	q->number_of_rates = 0;
125}
126
127void
128if_dead(struct ifnet *ifp)
129{
130
131	ifp->if_output = ifdead_output;
132	ifp->if_input = ifdead_input;
133	ifp->if_start = ifdead_start;
134	ifp->if_ioctl = ifdead_ioctl;
135	ifp->if_resolvemulti = ifdead_resolvemulti;
136	ifp->if_qflush = ifdead_qflush;
137	ifp->if_transmit = ifdead_transmit;
138	ifp->if_get_counter = ifdead_get_counter;
139	ifp->if_snd_tag_alloc = ifdead_snd_tag_alloc;
140	ifp->if_ratelimit_query = ifdead_ratelimit_query;
141}
142