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ipv6: do not free rt if FIB_LOOKUP_NOREF is set on suppress rule 

Commit 7d9e5f4221 removed references from certain dsts, but accounting
for this never translated down into the fib6 suppression code. This bug
was triggered by WireGuard users who use wg-quick(8), which uses the
"suppress-prefix" directive to ip-rule(8) for routing all of their
internet traffic without routing loops. The test case added here
causes the reference underflow by causing packets to evaluate a suppress
rule.

Fixes: 7d9e5f4221 ("ipv6: convert major tx path to use RT6_LOOKUP_F_DST_NOREF")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Acked-by: Wei Wang <weiwan@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason A. Donenfeld 2019-09-24 16:01:28 +02:00 committed by David S. Miller
parent ea8564c865
commit ca7a03c417
2 changed files with 18 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
net/ipv6/fib6_rules.c
View File

@ -287,7 +287,8 @@ static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg
return false;
suppress_route:
ip6_rt_put(rt);
if (!(arg->flags & FIB_LOOKUP_NOREF))
ip6_rt_put(rt);
return true;
}

17
tools/testing/selftests/net/fib_tests.sh
View File

@ -9,7 +9,7 @@ ret=0
ksft_skip=4
# all tests in this script. Can be overridden with -t option
TESTS="unregister down carrier nexthop ipv6_rt ipv4_rt ipv6_addr_metric ipv4_addr_metric ipv6_route_metrics ipv4_route_metrics ipv4_route_v6_gw rp_filter"
TESTS="unregister down carrier nexthop suppress ipv6_rt ipv4_rt ipv6_addr_metric ipv4_addr_metric ipv6_route_metrics ipv4_route_metrics ipv4_route_v6_gw rp_filter"
VERBOSE=0
PAUSE_ON_FAIL=no
@ -616,6 +616,20 @@ fib_nexthop_test()
cleanup
}
fib_suppress_test()
{
$IP link add dummy1 type dummy
$IP link set dummy1 up
$IP -6 route add default dev dummy1
$IP -6 rule add table main suppress_prefixlength 0
ping -f -c 1000 -W 1 1234::1 || true
$IP -6 rule del table main suppress_prefixlength 0
$IP link del dummy1
# If we got here without crashing, we're good.
return 0
}
################################################################################
# Tests on route add and replace
@ -1593,6 +1607,7 @@ do
fib_carrier_test|carrier) fib_carrier_test;;
fib_rp_filter_test|rp_filter) fib_rp_filter_test;;
fib_nexthop_test|nexthop) fib_nexthop_test;;
fib_suppress_test|suppress) fib_suppress_test;;
ipv6_route_test|ipv6_rt) ipv6_route_test;;
ipv4_route_test|ipv4_rt) ipv4_route_test;;
ipv6_addr_metric) ipv6_addr_metric_test;;