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 static void 130 ifdead_ratelimit_query(struct ifnet *ifp __unused, 131 struct if_ratelimit_query_results *q) 132 { 133 /* 134 * This guy does not support 135 * this interface. Not sure 136 * why we would specify a 137 * flag on the interface 138 * that says we do. 139 */ 140 q->rate_table = NULL; 141 q->flags = RT_NOSUPPORT; 142 q->max_flows = 0; 143 q->number_of_rates = 0; 144 } 145 146 void 147 if_dead(struct ifnet *ifp) 148 { 149 150 ifp->if_output = ifdead_output; 151 ifp->if_input = ifdead_input; 152 ifp->if_start = ifdead_start; 153 ifp->if_ioctl = ifdead_ioctl; 154 ifp->if_resolvemulti = ifdead_resolvemulti; 155 ifp->if_qflush = ifdead_qflush; 156 ifp->if_transmit = ifdead_transmit; 157 ifp->if_get_counter = ifdead_get_counter; 158 ifp->if_snd_tag_alloc = ifdead_snd_tag_alloc; 159 ifp->if_snd_tag_modify = ifdead_snd_tag_modify; 160 ifp->if_snd_tag_query = ifdead_snd_tag_query; 161 ifp->if_snd_tag_free = ifdead_snd_tag_free; 162 ifp->if_ratelimit_query = ifdead_ratelimit_query; 163 } 164