The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/if_dead.c

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    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: releng/10.1/sys/net/if_dead.c 249925 2013-04-26 12:50:32Z glebius $");
   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 }

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