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network/dhcp4: always find suitable gateway for destination address

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And if not found, refuse to configure the route.

If a DHCP server provides classless static or static routes, then we
should use the gateway for accessing a node in the range specified in
the route. E.g. if a DHCP server provides the default gateway is
192.168.0.1, and classless static route for 8.0.0.0/8 with gateway
192.168.0.2, then we should access 8.8.8.8 through 192.168.0.2 rather
than 192.168.0.1, but should use 192.168.0.1 for 9.9.9.9.

Fixes #28358.
This commit is contained in:
Yu Watanabe
2023-07-24 20:40:04 +09:00
parent 0bc8b6e265
commit 0ce86f5eeb
2 changed files with 139 additions and 23 deletions
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test/test-network/systemd-networkd-tests.py
+7 -3
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@@ -5042,9 +5042,13 @@ class NetworkdDHCPClientTests(unittest.TestCase, Utilities):
if dns_and_ntp_routes:
self.assertRegex(output, r'192.168.5.10 proto dhcp scope link src 192.168.5.[0-9]* metric 1024')
self.assertRegex(output, r'192.168.5.11 proto dhcp scope link src 192.168.5.[0-9]* metric 1024')
if classless and use_routes:
self.assertRegex(output, r'8.8.8.8 via 192.168.5.4 proto dhcp src 192.168.5.[0-9]* metric 1024')
self.assertRegex(output, r'9.9.9.9 via 192.168.5.4 proto dhcp src 192.168.5.[0-9]* metric 1024')
if use_routes:
if classless:
self.assertRegex(output, r'8.8.8.8 via 192.168.5.5 proto dhcp src 192.168.5.[0-9]* metric 1024')
self.assertRegex(output, r'9.9.9.9 via 192.168.5.4 proto dhcp src 192.168.5.[0-9]* metric 1024')
else:
self.assertRegex(output, r'8.8.8.8 via 192.168.5.3 proto dhcp src 192.168.5.[0-9]* metric 1024')
self.assertRegex(output, r'9.9.9.9 via 192.168.5.1 proto dhcp src 192.168.5.[0-9]* metric 1024')
else:
self.assertRegex(output, r'8.8.8.8 via 192.168.5.1 proto dhcp src 192.168.5.[0-9]* metric 1024')
self.assertRegex(output, r'9.9.9.9 via 192.168.5.1 proto dhcp src 192.168.5.[0-9]* metric 1024')