FreeBSD/Linux Kernel Cross Reference
sys/net/if_dead.c
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: releng/11.1/sys/net/if_dead.c 275730 2014-12-12 16:10:42Z jhb $");
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
44 static int
45 ifdead_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
53 static void
54 ifdead_input(struct ifnet *ifp, struct mbuf *m)
55 {
56
57 m_freem(m);
58 }
59
60 static void
61 ifdead_start(struct ifnet *ifp)
62 {
63
64 }
65
66 static int
67 ifdead_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
68 {
69
70 return (ENXIO);
71 }
72
73 static int
74 ifdead_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
75 struct sockaddr *sa)
76 {
77
78 *llsa = NULL;
79 return (ENXIO);
80 }
81
82 static void
83 ifdead_qflush(struct ifnet *ifp)
84 {
85
86 }
87
88 static int
89 ifdead_transmit(struct ifnet *ifp, struct mbuf *m)
90 {
91
92 m_freem(m);
93 return (ENXIO);
94 }
95
96 static uint64_t
97 ifdead_get_counter(struct ifnet *ifp, ift_counter cnt)
98 {
99
100 return (0);
101 }
102
103 void
104 if_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 }
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