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A mirror of the official Linux kernel repository just in case
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Vincent Bernat ccdb2d17df ip6: fix PMTU discovery when using /127 subnets 
The definition of an "anycast destination address" has been tweaked as a
side-effect of commit 2647a9b070 ("ipv6: Remove external dependency on
rt6i_gateway and RTF_ANYCAST"). The first address of a point-to-point
/127 subnet is now considered as an anycast address. This prevents
ICMPv6 errors to be returned to a sender of such a subnet and breaks
PMTU discovery.

This can be reproduced with:

    ip link add name out6 type veth peer name in6
    ip link add name out7 type veth peer name in7
    ip link set mtu 1400 dev out7
    ip link set mtu 1400 dev in7
    ip netns add next-hop
    ip netns add next-next-hop
    ip link set netns next-hop dev in6
    ip link set netns next-hop dev out7
    ip link set netns next-next-hop dev in7
    ip link set up dev out6
    ip addr add 2001:db8:1::12/127 dev out6
    ip netns exec next-hop ip link set up dev in6
    ip netns exec next-hop ip link set up dev out7
    ip netns exec next-hop ip addr add 2001:db8:1::13/127 dev in6
    ip netns exec next-hop ip addr add 2001:db8:1::14/127 dev out7
    ip netns exec next-hop ip route add default via 2001:db8:1::15
    ip netns exec next-hop sysctl -qw net.ipv6.conf.all.forwarding=1
    ip netns exec next-next-hop ip link set up dev in7
    ip netns exec next-next-hop ip addr add 2001:db8:1::15/127 dev in7
    ip netns exec next-next-hop ip addr add 2001:db8:1::50/128 dev in7
    ip netns exec next-next-hop ip route add default via 2001:db8:1::14
    ip netns exec next-next-hop sysctl -qw net.ipv6.conf.all.forwarding=1
    ip route add 2001:db8:1::48/123 via 2001:db8:1::13
    sleep 4
    ping -M do -s 1452 -c 3 2001:db8:1::50 || true
    ip route get 2001:db8:1::50

Before the patch, we get:

    2001:db8:1::50 from :: via 2001:db8:1::13 dev out6 src 2001:db8:1::12 metric 1024  pref medium

After the patch, we get:

    2001:db8:1::50 via 2001:db8:1::13 dev out6 src 2001:db8:1::12 metric 0
        cache  expires 578sec mtu 1400 pref medium

Fixes: 2647a9b070 ("ipv6: Remove external dependency on rt6i_gateway and RTF_ANYCAST")
Signed-off-by: Vincent Bernat <vincent@bernat.im>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-07-16 16:36:01 -07:00
arch Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc 2017-07-11 21:34:24 -07:00
block Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2017-07-11 15:36:52 -07:00
certs scripts/spelling.txt: add "intialise(d)" pattern and fix typo instances 2017-05-08 17:15:13 -07:00
crypto dmaengine updates for 4.13-rc1 2017-07-08 12:36:50 -07:00
Documentation Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-07-12 19:30:57 -07:00
drivers sunvnet: add support for IPv6 checksum offloads 2017-07-16 16:36:01 -07:00
firmware firmware/Makefile: force recompilation if makefile changes 2017-05-08 17:15:10 -07:00
fs Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs 2017-07-12 09:28:55 -07:00
include ip6: fix PMTU discovery when using /127 subnets 2017-07-16 16:36:01 -07:00
init mm: allow slab_nomerge to be set at build time 2017-07-06 16:24:31 -07:00
ipc mqueue: fix a use-after-free in sys_mq_notify() 2017-07-09 14:37:19 -07:00
kernel Modules updates for v4.13 2017-07-12 17:22:01 -07:00
lib lib/bsearch.c: micro-optimize pivot position calculation 2017-07-10 16:32:35 -07:00
mm kasan: make get_wild_bug_type() static 2017-07-10 16:32:33 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-07-12 19:30:57 -07:00
samples samples/bpf: fix a build issue 2017-07-11 20:51:29 -07:00
scripts Modules updates for v4.13 2017-07-12 17:22:01 -07:00
security Merge branch 'work.memdup_user' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-07-05 16:05:24 -07:00
sound main drm pull for v4.13 2017-07-09 18:48:37 -07:00
tools tools: hv: ignore a NIC if it has been configured 2017-07-16 16:36:01 -07:00
usr ramfs: clarify help text that compression applies to ramfs as well as legacy ramdisk. 2017-07-06 16:24:30 -07:00
virt PPC: 2017-07-06 18:38:31 -07:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Add hch to .get_maintainer.ignore 2015-08-21 14:30:10 -07:00
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore kbuild: Add support to generate LLVM assembly files 2017-04-25 08:13:52 +09:00
.mailmap power supply and reset changes for the v4.12 series (part 2) 2017-05-12 12:02:21 -07:00
COPYING
CREDITS avr32: remove support for AVR32 architecture 2017-05-01 09:27:15 +02:00
Kbuild kbuild: Consolidate header generation from ASM offset information 2017-04-13 05:43:37 +09:00
Kconfig
MAINTAINERS Merge branch 'i2c/for-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2017-07-12 10:04:56 -07:00
Makefile disable new gcc-7.1.1 warnings for now 2017-07-12 19:25:47 -07:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

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.