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 void 97 if_dead(struct ifnet *ifp) 98 { 99 100 ifp->if_output = ifdead_output; 101 ifp->if_input = ifdead_input; 102 ifp->if_start = ifdead_start; 103 ifp->if_ioctl = ifdead_ioctl; 104 ifp->if_resolvemulti = ifdead_resolvemulti; 105 ifp->if_qflush = ifdead_qflush; 106 ifp->if_transmit = ifdead_transmit; 107 } 108