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Merge branch 'ipv4-fix-route-update-on-metric-change'

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Paolo Abeni says:

====================
ipv4: fix route update on metric change.

This fixes connected route update on some edge cases for ip addr metric
change.
It additionally includes self tests for the covered scenarios. The new tests
fail on unpatched kernels and pass on the patched one.

v1 -> v2:
 - add selftests
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2019-10-26 11:25:53 -07:00
commit 45f3380699
2 changed files with 22 additions and 1 deletions
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2
net/ipv4/fib_frontend.c
View File

@ -1148,7 +1148,7 @@ void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric)
if (!(dev->flags & IFF_UP) ||
ifa->ifa_flags & (IFA_F_SECONDARY | IFA_F_NOPREFIXROUTE) ||
ipv4_is_zeronet(prefix) ||
prefix == ifa->ifa_local || ifa->ifa_prefixlen == 32)
(prefix == ifa->ifa_local && ifa->ifa_prefixlen == 32))
return;
/* add the new */

21
tools/testing/selftests/net/fib_tests.sh
View File

@ -1438,6 +1438,27 @@ ipv4_addr_metric_test()
fi
log_test $rc 0 "Prefix route with metric on link up"
# explicitly check for metric changes on edge scenarios
run_cmd "$IP addr flush dev dummy2"
run_cmd "$IP addr add dev dummy2 172.16.104.0/24 metric 259"
run_cmd "$IP addr change dev dummy2 172.16.104.0/24 metric 260"
rc=$?
if [ $rc -eq 0 ]; then
check_route "172.16.104.0/24 dev dummy2 proto kernel scope link src 172.16.104.0 metric 260"
rc=$?
fi
log_test $rc 0 "Modify metric of .0/24 address"
run_cmd "$IP addr flush dev dummy2"
run_cmd "$IP addr add dev dummy2 172.16.104.1/32 peer 172.16.104.2 metric 260"
run_cmd "$IP addr change dev dummy2 172.16.104.1/32 peer 172.16.104.2 metric 261"
rc=$?
if [ $rc -eq 0 ]; then
check_route "172.16.104.2 dev dummy2 proto kernel scope link src 172.16.104.1 metric 261"
rc=$?
fi
log_test $rc 0 "Modify metric of address with peer route"
$IP li del dummy1
$IP li del dummy2
cleanup