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Filename Latest commit message Latest commit date
Alexey Kodanev f870c1ff65 vxlan: restore dev->mtu setting based on lower device
Stefano Brivio says:
    Commit a985343ba9 ("vxlan: refactor verification and
    application of configuration") introduced a change in the
    behaviour of initial MTU setting: earlier, the MTU for a link
    created on top of a given lower device, without an initial MTU
    specification, was set to the MTU of the lower device minus
    headroom as a result of this path in vxlan_dev_configure():

	if (!conf->mtu)
		dev->mtu = lowerdev->mtu -
			   (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);

    which is now gone. Now, the initial MTU, in absence of a
    configured value, is simply set by ether_setup() to ETH_DATA_LEN
    (1500 bytes).

    This breaks userspace expectations in case the MTU of
    the lower device is higher than 1500 bytes minus headroom.

This patch restores the previous behaviour on newlink operation. Since
max_mtu can be negative and we update dev->mtu directly, also check it
for valid minimum.

Reported-by: Junhan Yan <juyan@redhat.com>
Fixes: a985343ba9 ("vxlan: refactor verification and application of configuration")
Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
Acked-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-12-16 23:05:10 -05:00
arch Revert "mm: replace p??_write with pte_access_permitted in fault + gup paths" 2017-12-15 18:53:22 -08:00
block Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2017-12-01 08:05:45 -05:00
certs
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2017-12-11 16:32:45 -08:00
Documentation Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs 2017-12-15 12:46:48 -08:00
drivers vxlan: restore dev->mtu setting based on lower device 2017-12-16 23:05:10 -05:00
firmware
fs NFS client fixes for Linux 4.15-rc4 2017-12-16 13:12:53 -08:00
include Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-12-15 13:08:37 -08:00
init
ipc
kernel Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-12-15 13:08:37 -08:00
lib Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-12-15 11:44:59 -08:00
mm Revert "mm: replace p??_write with pte_access_permitted in fault + gup paths" 2017-12-15 18:53:22 -08:00
net ipv6: icmp6: Allow icmp messages to be looped back 2017-12-16 22:51:26 -05:00
samples Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2017-12-03 13:08:30 -05:00
scripts Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-12-15 11:44:59 -08:00
security KEYS: reject NULL restriction string when type is specified 2017-12-08 15:13:29 +00:00
sound sound fixes for 4.15-rc3 2017-12-06 10:49:14 -08:00
tools Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-12-15 13:08:37 -08:00
usr
virt KVM: x86: fix APIC page invalidation 2017-12-06 16:10:34 +01:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-12-15 13:08:37 -08:00
Makefile Linux 4.15-rc3 2017-12-10 17:56:26 -08:00
README

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.