xref: /freebsd/sys/net/if_dead.c (revision fdafd315)
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 
44 static int
ifdead_output(struct ifnet * ifp,struct mbuf * m,const struct sockaddr * sa,struct route * ro)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
ifdead_input(struct ifnet * ifp,struct mbuf * m)54 ifdead_input(struct ifnet *ifp, struct mbuf *m)
55 {
56 
57 	m_freem(m);
58 }
59 
60 static void
ifdead_start(struct ifnet * ifp)61 ifdead_start(struct ifnet *ifp)
62 {
63 
64 }
65 
66 static int
ifdead_ioctl(struct ifnet * ifp,u_long cmd,caddr_t data)67 ifdead_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
68 {
69 
70 	return (ENXIO);
71 }
72 
73 static int
ifdead_resolvemulti(struct ifnet * ifp,struct sockaddr ** llsa,struct sockaddr * sa)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
ifdead_qflush(struct ifnet * ifp)83 ifdead_qflush(struct ifnet *ifp)
84 {
85 
86 }
87 
88 static int
ifdead_transmit(struct ifnet * ifp,struct mbuf * m)89 ifdead_transmit(struct ifnet *ifp, struct mbuf *m)
90 {
91 
92 	m_freem(m);
93 	return (ENXIO);
94 }
95 
96 static uint64_t
ifdead_get_counter(struct ifnet * ifp,ift_counter cnt)97 ifdead_get_counter(struct ifnet *ifp, ift_counter cnt)
98 {
99 
100 	return (0);
101 }
102 
103 static int
ifdead_snd_tag_alloc(struct ifnet * ifp,union if_snd_tag_alloc_params * params,struct m_snd_tag ** ppmt)104 ifdead_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 
110 static void
ifdead_ratelimit_query(struct ifnet * ifp __unused,struct if_ratelimit_query_results * q)111 ifdead_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 
127 void
if_dead(struct ifnet * ifp)128 if_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