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 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 static int 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 int 111 ifdead_vf_status(struct ifnet *ifp __unused, 112 struct if_vf_status **statusp __unused) 113 { 114 return (EOPNOTSUPP); 115 } 116 117 static void 118 ifdead_ratelimit_query(struct ifnet *ifp __unused, 119 struct if_ratelimit_query_results *q) 120 { 121 /* 122 * This guy does not support 123 * this interface. Not sure 124 * why we would specify a 125 * flag on the interface 126 * that says we do. 127 */ 128 q->rate_table = NULL; 129 q->flags = RT_NOSUPPORT; 130 q->max_flows = 0; 131 q->number_of_rates = 0; 132 } 133 134 void 135 if_dead(struct ifnet *ifp) 136 { 137 138 ifp->if_output = ifdead_output; 139 ifp->if_input = ifdead_input; 140 ifp->if_start = ifdead_start; 141 ifp->if_ioctl = ifdead_ioctl; 142 ifp->if_resolvemulti = ifdead_resolvemulti; 143 ifp->if_qflush = ifdead_qflush; 144 ifp->if_transmit = ifdead_transmit; 145 ifp->if_get_counter = ifdead_get_counter; 146 ifp->if_snd_tag_alloc = ifdead_snd_tag_alloc; 147 ifp->if_ratelimit_query = ifdead_ratelimit_query; 148 ifp->if_vf_status = ifdead_vf_status; 149 } 150