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/cdefs.h>
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 #include <net/if_private.h>
44
45 static int
ifdead_output(struct ifnet * ifp,struct mbuf * m,const struct sockaddr * sa,struct route * ro)46 ifdead_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa,
47 struct route *ro)
48 {
49
50 m_freem(m);
51 return (ENXIO);
52 }
53
54 static void
ifdead_input(struct ifnet * ifp,struct mbuf * m)55 ifdead_input(struct ifnet *ifp, struct mbuf *m)
56 {
57
58 m_freem(m);
59 }
60
61 static void
ifdead_start(struct ifnet * ifp)62 ifdead_start(struct ifnet *ifp)
63 {
64
65 }
66
67 static int
ifdead_ioctl(struct ifnet * ifp,u_long cmd,caddr_t data)68 ifdead_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
69 {
70
71 return (ENXIO);
72 }
73
74 static int
ifdead_resolvemulti(struct ifnet * ifp,struct sockaddr ** llsa,struct sockaddr * sa)75 ifdead_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
76 struct sockaddr *sa)
77 {
78
79 *llsa = NULL;
80 return (ENXIO);
81 }
82
83 static void
ifdead_qflush(struct ifnet * ifp)84 ifdead_qflush(struct ifnet *ifp)
85 {
86
87 }
88
89 static int
ifdead_transmit(struct ifnet * ifp,struct mbuf * m)90 ifdead_transmit(struct ifnet *ifp, struct mbuf *m)
91 {
92
93 m_freem(m);
94 return (ENXIO);
95 }
96
97 static uint64_t
ifdead_get_counter(struct ifnet * ifp,ift_counter cnt)98 ifdead_get_counter(struct ifnet *ifp, ift_counter cnt)
99 {
100
101 return (0);
102 }
103
104 static int
ifdead_snd_tag_alloc(struct ifnet * ifp,union if_snd_tag_alloc_params * params,struct m_snd_tag ** ppmt)105 ifdead_snd_tag_alloc(struct ifnet *ifp, union if_snd_tag_alloc_params *params,
106 struct m_snd_tag **ppmt)
107 {
108 return (EOPNOTSUPP);
109 }
110
111 static void
ifdead_ratelimit_query(struct ifnet * ifp __unused,struct if_ratelimit_query_results * q)112 ifdead_ratelimit_query(struct ifnet *ifp __unused,
113 struct if_ratelimit_query_results *q)
114 {
115 /*
116 * This guy does not support
117 * this interface. Not sure
118 * why we would specify a
119 * flag on the interface
120 * that says we do.
121 */
122 q->rate_table = NULL;
123 q->flags = RT_NOSUPPORT;
124 q->max_flows = 0;
125 q->number_of_rates = 0;
126 }
127
128 void
if_dead(struct ifnet * ifp)129 if_dead(struct ifnet *ifp)
130 {
131
132 ifp->if_output = ifdead_output;
133 ifp->if_input = ifdead_input;
134 ifp->if_start = ifdead_start;
135 ifp->if_ioctl = ifdead_ioctl;
136 ifp->if_resolvemulti = ifdead_resolvemulti;
137 ifp->if_qflush = ifdead_qflush;
138 ifp->if_transmit = ifdead_transmit;
139 ifp->if_get_counter = ifdead_get_counter;
140 ifp->if_snd_tag_alloc = ifdead_snd_tag_alloc;
141 ifp->if_ratelimit_query = ifdead_ratelimit_query;
142 }
143