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https://github.com/freebsd/freebsd-src.git
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Gleb Smirnoff
607f11055d
The old approach where we go through the list of interfaces and count them has bugs. One obvious bug with this dynamic translation is that once an Ethernet interface in the middle of the list goes away, all interfaces following it would change their Linux names. A bigger problem is the ifnet arrival and departure times. For example linsysfs has event handler for ifnet_arrival_event, and of course it wants to resolve the name. This accidentially works, due to a bug in if_attach() where we call if_link_ifnet() before invoking all the event handlers. Once the bug is fixed linsysfs won't be able to resolve the old way. The other side is ifnet_departure_event, where there is no bug, the eventhandlers are called after the if_unlink_ifnet(). This means old translation won't work for departure event handlers. One example is netlink. This change gives the Netlink a chance to emit a proper Linux interface departure message. However, there is another problem in Netlink, that the ifnet pointer is lost in the Netlink translation layer. Plug this with a cookie in netlink writer structure that can be set by the route layer and used by the Netlink Linux translation layer. This part of the diff seems unrelated, but it is hard to make it a separate change, as the old KPI goes away and to use the new one we need the pointer. Differential Revision: https://reviews.freebsd.org/D54077
85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
/*-
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* Copyright (c) 2014 Vassilis Laganakos
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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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#include <sys/param.h>
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#include <sys/exec.h>
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#include <sys/imgact.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/sx.h>
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#include <compat/linux/linux.h>
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#include <compat/linux/linux_mib.h>
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#include <compat/linux/linux_util.h>
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SET_DECLARE(linux_device_handler_set, struct linux_device_handler);
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TAILQ_HEAD(, linux_ioctl_handler_element) linux_ioctl_handlers =
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TAILQ_HEAD_INITIALIZER(linux_ioctl_handlers);
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struct sx linux_ioctl_sx;
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SX_SYSINIT(linux_ioctl, &linux_ioctl_sx, "Linux ioctl handlers");
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static int
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linux_common_modevent(module_t mod, int type, void *data)
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{
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struct linux_device_handler **ldhp;
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switch(type) {
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case MOD_LOAD:
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#ifdef INVARIANTS
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linux_check_errtbl();
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#endif
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linux_dev_shm_create();
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linux_osd_jail_register();
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SET_FOREACH(ldhp, linux_device_handler_set)
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linux_device_register_handler(*ldhp);
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linux_ifnet_init();
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linux_netlink_register();
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break;
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case MOD_UNLOAD:
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linux_dev_shm_destroy();
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linux_osd_jail_deregister();
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SET_FOREACH(ldhp, linux_device_handler_set)
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linux_device_unregister_handler(*ldhp);
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linux_ifnet_uninit();
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linux_netlink_deregister();
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break;
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default:
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return (EOPNOTSUPP);
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}
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return (0);
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}
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static moduledata_t linux_common_mod = {
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"linux_common",
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linux_common_modevent,
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0
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};
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DECLARE_MODULE(linux_common, linux_common_mod, SI_SUB_EXEC, SI_ORDER_ANY);
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MODULE_VERSION(linux_common, 1);
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MODULE_DEPEND(linux_common, netlink, 1, 1, 1);
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