1 /*- 2 * Copyright (c) 2009 Robert N. M. Watson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 /* 28 * When an interface has been detached but not yet freed, we set the various 29 * ifnet function pointers to "ifdead" versions. This prevents unexpected 30 * calls from the network stack into the device driver after if_detach() has 31 * returned. 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 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 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_snd_tag_modify(struct m_snd_tag *pmt, union if_snd_tag_modify_params *params) 112 { 113 return (EOPNOTSUPP); 114 } 115 116 static int 117 ifdead_snd_tag_query(struct m_snd_tag *pmt, union if_snd_tag_query_params *params) 118 { 119 return (EOPNOTSUPP); 120 } 121 122 static void 123 ifdead_snd_tag_free(struct m_snd_tag *pmt) 124 { 125 } 126 127 void 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_snd_tag_modify = ifdead_snd_tag_modify; 141 ifp->if_snd_tag_query = ifdead_snd_tag_query; 142 ifp->if_snd_tag_free = ifdead_snd_tag_free; 143 } 144