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 #include <net/if_private.h>
46
47 static int
48 ifdead_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa,
49 struct route *ro)
50 {
51
52 m_freem(m);
53 return (ENXIO);
54 }
55
56 static void
57 ifdead_input(struct ifnet *ifp, struct mbuf *m)
58 {
59
60 m_freem(m);
61 }
62
63 static void
64 ifdead_start(struct ifnet *ifp)
65 {
66
67 }
68
69 static int
70 ifdead_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
71 {
72
73 return (ENXIO);
74 }
75
76 static int
77 ifdead_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
78 struct sockaddr *sa)
79 {
80
81 *llsa = NULL;
82 return (ENXIO);
83 }
84
85 static void
86 ifdead_qflush(struct ifnet *ifp)
87 {
88
89 }
90
91 static int
92 ifdead_transmit(struct ifnet *ifp, struct mbuf *m)
93 {
94
95 m_freem(m);
96 return (ENXIO);
97 }
98
99 static uint64_t
100 ifdead_get_counter(struct ifnet *ifp, ift_counter cnt)
101 {
102
103 return (0);
104 }
105
106 static int
107 ifdead_snd_tag_alloc(struct ifnet *ifp, union if_snd_tag_alloc_params *params,
108 struct m_snd_tag **ppmt)
109 {
110 return (EOPNOTSUPP);
111 }
112
113 static void
114 ifdead_ratelimit_query(struct ifnet *ifp __unused,
115 struct if_ratelimit_query_results *q)
116 {
117 /*
118 * This guy does not support
119 * this interface. Not sure
120 * why we would specify a
121 * flag on the interface
122 * that says we do.
123 */
124 q->rate_table = NULL;
125 q->flags = RT_NOSUPPORT;
126 q->max_flows = 0;
127 q->number_of_rates = 0;
128 }
129
130 void
131 if_dead(struct ifnet *ifp)
132 {
133
134 ifp->if_output = ifdead_output;
135 ifp->if_input = ifdead_input;
136 ifp->if_start = ifdead_start;
137 ifp->if_ioctl = ifdead_ioctl;
138 ifp->if_resolvemulti = ifdead_resolvemulti;
139 ifp->if_qflush = ifdead_qflush;
140 ifp->if_transmit = ifdead_transmit;
141 ifp->if_get_counter = ifdead_get_counter;
142 ifp->if_snd_tag_alloc = ifdead_snd_tag_alloc;
143 ifp->if_ratelimit_query = ifdead_ratelimit_query;
144 }
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