FreeBSD/Linux Kernel Cross Reference
sys/net/if_dead.c
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 __FBSDID("$FreeBSD$");
38
39 #include <sys/param.h>
40 #include <sys/mbuf.h>
41 #include <sys/socket.h>
42
43 #include <net/if.h>
44 #include <net/if_var.h>
45
46 static int
47 ifdead_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa,
48 struct route *ro)
49 {
50
51 m_freem(m);
52 return (ENXIO);
53 }
54
55 static void
56 ifdead_input(struct ifnet *ifp, struct mbuf *m)
57 {
58
59 m_freem(m);
60 }
61
62 static void
63 ifdead_start(struct ifnet *ifp)
64 {
65
66 }
67
68 static int
69 ifdead_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
70 {
71
72 return (ENXIO);
73 }
74
75 static int
76 ifdead_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
77 struct sockaddr *sa)
78 {
79
80 *llsa = NULL;
81 return (ENXIO);
82 }
83
84 static void
85 ifdead_qflush(struct ifnet *ifp)
86 {
87
88 }
89
90 static int
91 ifdead_transmit(struct ifnet *ifp, struct mbuf *m)
92 {
93
94 m_freem(m);
95 return (ENXIO);
96 }
97
98 static uint64_t
99 ifdead_get_counter(struct ifnet *ifp, ift_counter cnt)
100 {
101
102 return (0);
103 }
104
105 static int
106 ifdead_snd_tag_alloc(struct ifnet *ifp, union if_snd_tag_alloc_params *params,
107 struct m_snd_tag **ppmt)
108 {
109 return (EOPNOTSUPP);
110 }
111
112 static int
113 ifdead_snd_tag_modify(struct m_snd_tag *pmt, union if_snd_tag_modify_params *params)
114 {
115 return (EOPNOTSUPP);
116 }
117
118 static int
119 ifdead_snd_tag_query(struct m_snd_tag *pmt, union if_snd_tag_query_params *params)
120 {
121 return (EOPNOTSUPP);
122 }
123
124 static void
125 ifdead_snd_tag_free(struct m_snd_tag *pmt)
126 {
127 }
128
129 void
130 if_dead(struct ifnet *ifp)
131 {
132
133 ifp->if_output = ifdead_output;
134 ifp->if_input = ifdead_input;
135 ifp->if_start = ifdead_start;
136 ifp->if_ioctl = ifdead_ioctl;
137 ifp->if_resolvemulti = ifdead_resolvemulti;
138 ifp->if_qflush = ifdead_qflush;
139 ifp->if_transmit = ifdead_transmit;
140 ifp->if_get_counter = ifdead_get_counter;
141 ifp->if_snd_tag_alloc = ifdead_snd_tag_alloc;
142 ifp->if_snd_tag_modify = ifdead_snd_tag_modify;
143 ifp->if_snd_tag_query = ifdead_snd_tag_query;
144 ifp->if_snd_tag_free = ifdead_snd_tag_free;
145 }
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