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