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 #include <net/if_private.h> 46 47 static int 48 ifdead_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 49 struct route *ro) 50 { 51 52 m_freem(m); 53 return (ENXIO); 54 } 55 56 static void 57 ifdead_input(struct ifnet *ifp, struct mbuf *m) 58 { 59 60 m_freem(m); 61 } 62 63 static void 64 ifdead_start(struct ifnet *ifp) 65 { 66 67 } 68 69 static int 70 ifdead_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 71 { 72 73 return (ENXIO); 74 } 75 76 static int 77 ifdead_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa, 78 struct sockaddr *sa) 79 { 80 81 *llsa = NULL; 82 return (ENXIO); 83 } 84 85 static void 86 ifdead_qflush(struct ifnet *ifp) 87 { 88 89 } 90 91 static int 92 ifdead_transmit(struct ifnet *ifp, struct mbuf *m) 93 { 94 95 m_freem(m); 96 return (ENXIO); 97 } 98 99 static uint64_t 100 ifdead_get_counter(struct ifnet *ifp, ift_counter cnt) 101 { 102 103 return (0); 104 } 105 106 static int 107 ifdead_snd_tag_alloc(struct ifnet *ifp, union if_snd_tag_alloc_params *params, 108 struct m_snd_tag **ppmt) 109 { 110 return (EOPNOTSUPP); 111 } 112 113 static void 114 ifdead_ratelimit_query(struct ifnet *ifp __unused, 115 struct if_ratelimit_query_results *q) 116 { 117 /* 118 * This guy does not support 119 * this interface. Not sure 120 * why we would specify a 121 * flag on the interface 122 * that says we do. 123 */ 124 q->rate_table = NULL; 125 q->flags = RT_NOSUPPORT; 126 q->max_flows = 0; 127 q->number_of_rates = 0; 128 } 129 130 void 131 if_dead(struct ifnet *ifp) 132 { 133 134 ifp->if_output = ifdead_output; 135 ifp->if_input = ifdead_input; 136 ifp->if_start = ifdead_start; 137 ifp->if_ioctl = ifdead_ioctl; 138 ifp->if_resolvemulti = ifdead_resolvemulti; 139 ifp->if_qflush = ifdead_qflush; 140 ifp->if_transmit = ifdead_transmit; 141 ifp->if_get_counter = ifdead_get_counter; 142 ifp->if_snd_tag_alloc = ifdead_snd_tag_alloc; 143 ifp->if_ratelimit_query = ifdead_ratelimit_query; 144 } 145