Tim Stallard 03e2a984b6 net: ipv6: do not consider routes via gateways for anycast address check ... The behaviour for what is considered an anycast address changed in commit 45e4fd2668 ("ipv6: Only create RTF_CACHE routes after encountering pmtu exception"). This now considers the first address in a subnet where there is a route via a gateway to be an anycast address. This breaks path MTU discovery and traceroutes when a host in a remote network uses the address at the start of a prefix (eg 2600:: advertised as 2600::/48 in the DFZ) as ICMP errors will not be sent to anycast addresses. This patch excludes any routes with a gateway, or via point to point links, like the behaviour previously from rt6_is_gw_or_nonexthop in net/ipv6/route.c. This can be tested with: ip link add v1 type veth peer name v2 ip netns add test ip netns exec test ip link set lo up ip link set v2 netns test ip link set v1 up ip netns exec test ip link set v2 up ip addr add 2001:db8::1/64 dev v1 nodad ip addr add 2001:db8:100:: dev lo nodad ip netns exec test ip addr add 2001:db8::2/64 dev v2 nodad ip netns exec test ip route add unreachable 2001:db8:1::1 ip netns exec test ip route add 2001:db8:100::/64 via 2001:db8::1 ip netns exec test sysctl net.ipv6.conf.all.forwarding=1 ip route add 2001:db8:1::1 via 2001:db8::2 ping -I 2001:db8::1 2001:db8:1::1 -c1 ping -I 2001:db8:100:: 2001:db8:1::1 -c1 ip addr delete 2001:db8:100:: dev lo ip netns delete test Currently the first ping will get back a destination unreachable ICMP error, but the second will never get a response, with "icmp6_send: acast source" logged. After this patch, both get destination unreachable ICMP replies. Fixes: 45e4fd2668 ("ipv6: Only create RTF_CACHE routes after encountering pmtu exception") Signed-off-by: Tim Stallard <code@timstallard.me.uk> Signed-off-by: David S. Miller <davem@davemloft.net>		2020-04-07 18:26:52 -07:00
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acpi	Additional ACPI updates for 5.7-rc1	2020-04-06 10:35:06 -07:00
asm-generic	userfaultfd: wp: add pmd_swp_*uffd_wp() helpers	2020-04-07 10:43:39 -07:00
clocksource
crypto
drm
dt-bindings	There's not much to see in the core framework this time around. Instead the	2020-04-05 10:43:32 -07:00
keys
kunit
kvm
linux	Merge branch 'akpm' (patches from Andrew)	2020-04-07 14:11:54 -07:00
math-emu
media
misc
net	net: ipv6: do not consider routes via gateways for anycast address check	2020-04-07 18:26:52 -07:00
pcmcia
ras
rdma
scsi
soc	ARM: driver updates	2020-04-03 15:05:35 -07:00
sound
target
trace	Merge branch 'akpm' (patches from Andrew)	2020-04-07 14:11:54 -07:00
uapi	Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf	2020-04-07 18:08:06 -07:00
vdso
video
xen