111c6b617b
pointers to "dead" implementations that no-op rather than invoking the device driver. This would generally be unexpected and possibly quite badly handled by most device drivers after if_detach() has completed. Reviewed by: bms MFC after: 3 weeks
115 lines
2.7 KiB
C
115 lines
2.7 KiB
C
/*-
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* Copyright (c) 2009 Robert N. M. Watson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* When an interface has been detached but not yet freed, we set the various
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* ifnet function pointers to "ifdead" versions. This prevents unexpected
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* calls from the network stack into the device driver after if_detach() has
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* returned.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_var.h>
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static int
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ifdead_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa,
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struct route *ro)
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{
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m_freem(m);
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return (ENXIO);
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}
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static void
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ifdead_input(struct ifnet *ifp, struct mbuf *m)
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{
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m_freem(m);
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}
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static void
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ifdead_start(struct ifnet *ifp)
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{
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}
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static int
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ifdead_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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{
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return (ENXIO);
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}
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static void
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ifdead_watchdog(struct ifnet *ifp)
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{
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}
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static int
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ifdead_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
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struct sockaddr *sa)
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{
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*llsa = NULL;
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return (ENXIO);
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}
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static void
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ifdead_qflush(struct ifnet *ifp)
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{
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}
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static int
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ifdead_transmit(struct ifnet *ifp, struct mbuf *m)
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{
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m_freem(m);
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return (ENXIO);
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}
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void
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if_dead(struct ifnet *ifp)
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{
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ifp->if_output = ifdead_output;
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ifp->if_input = ifdead_input;
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ifp->if_start = ifdead_start;
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ifp->if_ioctl = ifdead_ioctl;
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ifp->if_watchdog = ifdead_watchdog;
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ifp->if_resolvemulti = ifdead_resolvemulti;
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ifp->if_qflush = ifdead_qflush;
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ifp->if_transmit = ifdead_transmit;
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}
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