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/cdefs.h> 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 #include <net/if_private.h> 44 45 static int 46 ifdead_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 47 struct route *ro) 48 { 49 50 m_freem(m); 51 return (ENXIO); 52 } 53 54 static void 55 ifdead_input(struct ifnet *ifp, struct mbuf *m) 56 { 57 58 m_freem(m); 59 } 60 61 static void 62 ifdead_start(struct ifnet *ifp) 63 { 64 65 } 66 67 static int 68 ifdead_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 69 { 70 71 return (ENXIO); 72 } 73 74 static int 75 ifdead_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa, 76 struct sockaddr *sa) 77 { 78 79 *llsa = NULL; 80 return (ENXIO); 81 } 82 83 static void 84 ifdead_qflush(struct ifnet *ifp) 85 { 86 87 } 88 89 static int 90 ifdead_transmit(struct ifnet *ifp, struct mbuf *m) 91 { 92 93 m_freem(m); 94 return (ENXIO); 95 } 96 97 static uint64_t 98 ifdead_get_counter(struct ifnet *ifp, ift_counter cnt) 99 { 100 101 return (0); 102 } 103 104 static int 105 ifdead_snd_tag_alloc(struct ifnet *ifp, union if_snd_tag_alloc_params *params, 106 struct m_snd_tag **ppmt) 107 { 108 return (EOPNOTSUPP); 109 } 110 111 static void 112 ifdead_ratelimit_query(struct ifnet *ifp __unused, 113 struct if_ratelimit_query_results *q) 114 { 115 /* 116 * This guy does not support 117 * this interface. Not sure 118 * why we would specify a 119 * flag on the interface 120 * that says we do. 121 */ 122 q->rate_table = NULL; 123 q->flags = RT_NOSUPPORT; 124 q->max_flows = 0; 125 q->number_of_rates = 0; 126 } 127 128 void 129 if_dead(struct ifnet *ifp) 130 { 131 132 ifp->if_output = ifdead_output; 133 ifp->if_input = ifdead_input; 134 ifp->if_start = ifdead_start; 135 ifp->if_ioctl = ifdead_ioctl; 136 ifp->if_resolvemulti = ifdead_resolvemulti; 137 ifp->if_qflush = ifdead_qflush; 138 ifp->if_transmit = ifdead_transmit; 139 ifp->if_get_counter = ifdead_get_counter; 140 ifp->if_snd_tag_alloc = ifdead_snd_tag_alloc; 141 ifp->if_ratelimit_query = ifdead_ratelimit_query; 142 } 143