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Merge pull request #15136 from yuwata/network-dhcp4-use-gateway

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network: add a flag to ignore gateway provided by DHCP server
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2020-03-17 16:51:18 +01:00 committed by GitHub
commit 34bc838f15
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8 changed files with 38 additions and 2 deletions
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8
man/systemd.network.xml
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@ -1474,7 +1474,13 @@
"link" scope will be used. For anything else, scope defaults to "global".</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>UseGateway=</varname></term>
<listitem>
<para>When true (the default), the gateway will be requested from the DHCP server and added to the
routing table with a metric of 1024, and a scope of "link".</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>UseTimezone=</varname></term>

5
src/network/networkd-dhcp4.c
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@ -323,6 +323,9 @@ static int link_set_dhcp_routes(Link *link) {
}
}
if (!link->network->dhcp_use_gateway)
return 0;
r = sd_dhcp_lease_get_router(link->dhcp_lease, &router);
if (IN_SET(r, 0, -ENODATA))
log_link_info(link, "DHCP: No gateway received from DHCP server.");
@ -451,7 +454,7 @@ static int dhcp_remove_router(Link *link, sd_dhcp_lease *lease, const struct in_
assert(link);
assert(address);
if (!link->network->dhcp_use_routes)
if (!link->network->dhcp_use_gateway)
return 0;
r = sd_dhcp_lease_get_router(lease, &router);

1
src/network/networkd-network-gperf.gperf
View File

@ -163,6 +163,7 @@ DHCPv4.UseMTU, config_parse_bool,
DHCPv4.UseHostname, config_parse_bool, 0, offsetof(Network, dhcp_use_hostname)
DHCPv4.UseDomains, config_parse_dhcp_use_domains, 0, offsetof(Network, dhcp_use_domains)
DHCPv4.UseRoutes, config_parse_bool, 0, offsetof(Network, dhcp_use_routes)
DHCPv4.UseGateway, config_parse_bool, 0, offsetof(Network, dhcp_use_gateway)
DHCPv4.RequestOptions, config_parse_dhcp_request_options, 0, 0
DHCPv4.Anonymize, config_parse_bool, 0, offsetof(Network, dhcp_anonymize)
DHCPv4.SendHostname, config_parse_bool, 0, offsetof(Network, dhcp_send_hostname)

1
src/network/networkd-network.c
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@ -384,6 +384,7 @@ int network_load_one(Manager *manager, OrderedHashmap **networks, const char *fi
.dhcp_use_dns = true,
.dhcp_use_hostname = true,
.dhcp_use_routes = true,
.dhcp_use_gateway = true,
/* NOTE: this var might be overwritten by network_apply_anonymize_if_set */
.dhcp_send_hostname = true,
.dhcp_send_release = true,

1
src/network/networkd-network.h
View File

@ -109,6 +109,7 @@ struct Network {
bool dhcp_use_sip;
bool dhcp_use_mtu;
bool dhcp_use_routes;
bool dhcp_use_gateway;
bool dhcp_use_timezone;
bool rapid_commit;
bool dhcp_use_hostname;

1
test/fuzz/fuzz-network-parser/directives.network
View File

@ -73,6 +73,7 @@ UseDNS=
RoutesToDNS=
UseDomains=
UseRoutes=
UseGateway=
IAID=
UserClass=
UseNTP=

9
test/test-network/conf/dhcp-client-ipv4-use-gateway-no.network Normal file
View File

@ -0,0 +1,9 @@
[Match]
Name=veth99
[Network]
DHCP=ipv4
IPv6AcceptRA=false
[DHCPv4]
UseGateway=no

14
test/test-network/systemd-networkd-tests.py
View File

@ -2921,6 +2921,7 @@ class NetworkdDHCPClientTests(unittest.TestCase, Utilities):
'dhcp-client-ipv4-dhcp-settings.network',
'dhcp-client-ipv4-only-ipv6-disabled.network',
'dhcp-client-ipv4-only.network',
'dhcp-client-ipv4-use-gateway-no.network',
'dhcp-client-ipv4-use-routes-no.network',
'dhcp-client-ipv6-only.network',
'dhcp-client-ipv6-rapid-commit.network',
@ -3040,6 +3041,19 @@ class NetworkdDHCPClientTests(unittest.TestCase, Utilities):
self.assertRegex(output, r'default via 192.168.5.1 proto dhcp src 192.168.5.181 metric 1024')
self.assertRegex(output, r'192.168.5.1 proto dhcp scope link src 192.168.5.181 metric 1024')
def test_dhcp_client_ipv4_use_gateway_no(self):
copy_unit_to_networkd_unit_path('25-veth.netdev', 'dhcp-server-veth-peer.network', 'dhcp-client-ipv4-use-gateway-no.network')
start_networkd()
self.wait_online(['veth-peer:carrier'])
start_dnsmasq(additional_options='--dhcp-option=option:dns-server,192.168.5.6,192.168.5.7', lease_time='2m')
self.wait_online(['veth99:routable', 'veth-peer:routable'])
output = check_output('ip route show dev veth99')
print(output)
self.assertRegex(output, r'192.168.5.0/24 via 192.168.5.5 proto dhcp src 192.168.5.181 metric 1024')
self.assertNotRegex(output, r'default via 192.168.5.1')
def test_dhcp_client_ipv4_ipv6(self):
copy_unit_to_networkd_unit_path('25-veth.netdev', 'dhcp-server-veth-peer.network', 'dhcp-client-ipv6-only.network',
'dhcp-client-ipv4-only.network')