Paolo Abeni 6e617de84e net: avoid a full fib lookup when rp_filter is disabled. ... Since commit 1dced6a854 ("ipv4: Restore accept_local behaviour in fib_validate_source()") a full fib lookup is needed even if the rp_filter is disabled, if accept_local is false - which is the default. What we really need in the above scenario is just checking that the source IP address is not local, and in most case we can do that is a cheaper way looking up the ifaddr hash table. This commit adds a helper for such lookup, and uses it to validate the src address when rp_filter is disabled and no 'local' routes are created by the user space in the relevant namespace. A new ipv4 netns flag is added to account for such routes. We need that to preserve the same behavior we had before this patch. It also drops the checks to bail early from __fib_validate_source, added by the commit 1dced6a854 ("ipv4: Restore accept_local behaviour in fib_validate_source()") they do not give any measurable performance improvement: if we do the lookup with are on a slower path. This improves UDP performances for unconnected sockets when rp_filter is disabled by 5% and also gives small but measurable performance improvement for TCP flood scenarios. v1 -> v2: - use the ifaddr lookup helper in __ip_dev_find(), as suggested by Eric - fall-back to full lookup if custom local routes are present Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2017-09-21 15:15:22 -07:00
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acpi	Device properties framework updates for v4.14-rc1	2017-09-05 12:50:00 -07:00
asm-generic	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-09-14 20:01:41 -07:00
clocksource	…
crypto	…
drm	lib/interval_tree: fast overlap detection	2017-09-08 18:26:49 -07:00
dt-bindings	Merge branch '4.14-features' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2017-09-15 20:43:33 -07:00
keys	…
kvm	…
linux	net: avoid a full fib lookup when rp_filter is disabled.	2017-09-21 15:15:22 -07:00
math-emu	…
media	media updates for v4.14-rc1	2017-09-07 12:53:14 -07:00
memory	…
misc	…
net	net: avoid a full fib lookup when rp_filter is disabled.	2017-09-21 15:15:22 -07:00
pcmcia	…
ras	…
rdma	More RDMA work and some op-structure constification from Chuck Lever,	2017-09-09 13:31:49 -07:00
scsi	SCSI misc on 20170913	2017-09-13 10:47:14 -07:00
soc	ARM: SoC driver updates for v4.14	2017-09-10 20:40:00 -07:00
sound	sound updates for 4.14-rc1	2017-09-07 12:44:53 -07:00
target	…
trace	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2017-09-16 11:28:59 -07:00
uapi	Merge branch 'zstd-minimal' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs	2017-09-14 17:30:49 -07:00
video	…
xen	…