freebsd-dev/sys/net/if_dead.c
Randall Stewart 20abea6663 This adds the third step in getting BBR into the tree. BBR and
an updated rack depend on having access to the new
ratelimit api in this commit.

Sponsored by:	Netflix Inc.
Differential Revision:	https://reviews.freebsd.org/D20953
2019-08-01 14:17:31 +00:00

164 lines
3.8 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2009 Robert N. M. Watson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* When an interface has been detached but not yet freed, we set the various
* ifnet function pointers to "ifdead" versions. This prevents unexpected
* calls from the network stack into the device driver after if_detach() has
* returned.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_var.h>
static int
ifdead_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa,
struct route *ro)
{
m_freem(m);
return (ENXIO);
}
static void
ifdead_input(struct ifnet *ifp, struct mbuf *m)
{
m_freem(m);
}
static void
ifdead_start(struct ifnet *ifp)
{
}
static int
ifdead_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
return (ENXIO);
}
static int
ifdead_resolvemulti(struct ifnet *ifp, struct sockaddr **llsa,
struct sockaddr *sa)
{
*llsa = NULL;
return (ENXIO);
}
static void
ifdead_qflush(struct ifnet *ifp)
{
}
static int
ifdead_transmit(struct ifnet *ifp, struct mbuf *m)
{
m_freem(m);
return (ENXIO);
}
static uint64_t
ifdead_get_counter(struct ifnet *ifp, ift_counter cnt)
{
return (0);
}
static int
ifdead_snd_tag_alloc(struct ifnet *ifp, union if_snd_tag_alloc_params *params,
struct m_snd_tag **ppmt)
{
return (EOPNOTSUPP);
}
static int
ifdead_snd_tag_modify(struct m_snd_tag *pmt, union if_snd_tag_modify_params *params)
{
return (EOPNOTSUPP);
}
static int
ifdead_snd_tag_query(struct m_snd_tag *pmt, union if_snd_tag_query_params *params)
{
return (EOPNOTSUPP);
}
static void
ifdead_snd_tag_free(struct m_snd_tag *pmt)
{
}
static void
ifdead_ratelimit_query(struct ifnet *ifp __unused,
struct if_ratelimit_query_results *q)
{
/*
* This guy does not support
* this interface. Not sure
* why we would specify a
* flag on the interface
* that says we do.
*/
q->rate_table = NULL;
q->flags = RT_NOSUPPORT;
q->max_flows = 0;
q->number_of_rates = 0;
}
void
if_dead(struct ifnet *ifp)
{
ifp->if_output = ifdead_output;
ifp->if_input = ifdead_input;
ifp->if_start = ifdead_start;
ifp->if_ioctl = ifdead_ioctl;
ifp->if_resolvemulti = ifdead_resolvemulti;
ifp->if_qflush = ifdead_qflush;
ifp->if_transmit = ifdead_transmit;
ifp->if_get_counter = ifdead_get_counter;
ifp->if_snd_tag_alloc = ifdead_snd_tag_alloc;
ifp->if_snd_tag_modify = ifdead_snd_tag_modify;
ifp->if_snd_tag_query = ifdead_snd_tag_query;
ifp->if_snd_tag_free = ifdead_snd_tag_free;
ifp->if_ratelimit_query = ifdead_ratelimit_query;
}