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nexedi
re6stnet
Commits
6c4a5443
Commit
6c4a5443
authored
Jun 21, 2016
by
Julien Muchembled
1
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Flush routing cache automatically when it contains invalid entries
parent
b12ace8c
Changes
1
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1 changed file
with
50 additions
and
3 deletions
+50
-3
re6st/tunnel.py
re6st/tunnel.py
+50
-3
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re6st/tunnel.py
View file @
6c4a5443
...
...
@@ -200,9 +200,19 @@ class BaseTunnelManager(object):
self
.
_peers
=
[
p
]
self
.
_timeouts
=
[(
p
.
stop_date
,
self
.
invalidatePeers
)]
# Only to check routing cache. Should go back to
# TunnelManager when we don't need to check it anymore.
self
.
_next_refresh
=
time
.
time
()
def
select
(
self
,
r
,
w
,
t
):
r
[
self
.
sock
]
=
self
.
handlePeerEvent
t
+=
self
.
_timeouts
if
self
.
_next_refresh
:
# same comment as in __init__
t
.
append
((
self
.
_next_refresh
,
self
.
refresh
))
def
refresh
(
self
):
self
.
_next_refresh
=
time
.
time
()
+
5
self
.
checkRoutingCache
()
def
selectTimeout
(
self
,
next
,
callback
,
force
=
True
):
t
=
self
.
_timeouts
...
...
@@ -402,6 +412,10 @@ class BaseTunnelManager(object):
' %s/%s'
%
(
int
(
x
,
2
),
len
(
x
))
for
x
in
(
self
.
_connection_dict
,
self
.
_served
)
for
x
in
x
)
elif
code
==
7
:
# XXX: Quick'n dirty way to log in a common place.
if
peer
and
self
.
_prefix
==
self
.
cache
.
registry_prefix
:
logging
.
info
(
"%s/%s: %s"
,
int
(
peer
,
2
),
len
(
peer
),
msg
)
@
staticmethod
def
_restart
():
...
...
@@ -476,6 +490,41 @@ class BaseTunnelManager(object):
if
self
.
_gateway_manager
is
not
None
:
self
.
_gateway_manager
.
remove
(
trusted_ip
)
def
checkRoutingCache
(
self
):
# WRKD: Check that routes in cache match the routing table.
# There were changes in Linux 4.2 to not cache routes uselessly
# and the bug may have been fixed at the same time. At least,
# it happens less often than with previous versions.
# babeld has a distinct issue (no atomic update of route) that
# increases the probability of invalid entries in the cache:
# https://lists.alioth.debian.org/pipermail/babel-users/2016-June/002547.html
with
open
(
'/proc/net/ipv6_route'
,
"r"
,
4096
)
as
f
:
routing_table
=
f
.
read
()
cache
=
[]
other
=
[]
n
=
self
.
_network
a
=
len
(
n
)
for
line
in
routing_table
.
splitlines
():
line
=
line
.
split
()
dst
=
bin
(
int
(
line
[
0
],
16
))[
2
:].
rjust
(
128
,
'0'
)
if
dst
.
startswith
(
n
):
flags
=
int
(
line
[
8
],
16
)
if
not
(
flags
&
0x80000000
):
# RTF_LOCAL
(
cache
if
flags
&
0x1000000
# RTF_CACHE
else
other
).
append
((
dst
[
a
:
int
(
line
[
1
],
16
)],
line
[
4
]))
other
.
sort
()
for
dst
,
via
in
cache
:
i
=
bisect
(
other
,
(
dst
,))
if
i
==
len
(
other
)
or
dst
<
other
[
i
][
0
]:
i
-=
1
if
dst
.
startswith
(
other
[
i
][
0
])
and
via
!=
other
[
i
][
1
]:
msg
=
"Invalid route in cache for "
+
utils
.
ipFromBin
(
n
+
dst
)
logging
.
error
(
"%s. Flushing..."
,
msg
)
subprocess
.
call
((
"ip"
,
"-6"
,
"route"
,
"flush"
,
"cached"
))
self
.
sendto
(
self
.
cache
.
registry_prefix
,
'
\
7
%s (%s)'
%
(
msg
,
os
.
uname
()[
2
]))
break
class
TunnelManager
(
BaseTunnelManager
):
...
...
@@ -502,7 +551,6 @@ class TunnelManager(BaseTunnelManager):
self
.
_neighbour_set
=
set
(
map
(
utils
.
binFromSubnet
,
neighbour_list
))
self
.
_killing
=
{}
self
.
_next_refresh
=
time
.
time
()
self
.
resetTunnelRefresh
()
self
.
_client_count
=
client_count
...
...
@@ -553,8 +601,6 @@ class TunnelManager(BaseTunnelManager):
def
select
(
self
,
r
,
w
,
t
):
super
(
TunnelManager
,
self
).
select
(
r
,
w
,
t
)
r
[
self
.
_read_sock
]
=
self
.
handleClientEvent
if
self
.
_next_refresh
:
t
.
append
((
self
.
_next_refresh
,
self
.
refresh
))
self
.
ctl
.
select
(
r
,
w
,
t
)
def
refresh
(
self
):
...
...
@@ -567,6 +613,7 @@ class TunnelManager(BaseTunnelManager):
self
.
ctl
.
request_dump
()
# calls babel_dump immediately at startup
else
:
self
.
_next_refresh
=
time
.
time
()
+
5
self
.
checkRoutingCache
()
def
babel_dump
(
self
):
t
=
time
.
time
()
...
...
Julien Muchembled
@jm
mentioned in commit
cfb7e3f7
·
Jun 22, 2016
mentioned in commit
cfb7e3f7
mentioned in commit cfb7e3f7dd34f204fbc97b486b930a0f8e2f9830
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