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network/nexthop: do not remove depending nexthops when a nexthop is removed

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Previously, when a nexthop is removed, depending nexthops were removed, but
that's not necessary, as the kernel keeps them, at least with v6.11.
This commit is contained in:
Yu Watanabe 2024-11-11 13:51:49 +09:00 committed by Luca Boccassi
parent 422e418ab9
commit 1ca180b994
2 changed files with 13 additions and 16 deletions
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16
src/network/networkd-nexthop.c
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@ -491,19 +491,9 @@ static int nexthop_remove_dependents(NextHop *nexthop, Manager *manager) {
assert(nexthop);
assert(manager);
/* If a nexthop is removed, the kernel silently removes nexthops and routes that depend on the
* removed nexthop. Let's remove them for safety (though, they are already removed in the kernel,
* hence that should fail), and forget them. */
void *id;
SET_FOREACH(id, nexthop->nexthops) {
NextHop *nh;
if (nexthop_get_by_id(manager, PTR_TO_UINT32(id), &nh) < 0)
continue;
RET_GATHER(r, nexthop_remove(nh, manager));
}
/* If a nexthop is removed, the kernel silently removes routes that depend on the removed nexthop.
* Let's remove them for safety (though, they are already removed in the kernel, hence that should
* fail), and forget them. */
Route *route;
SET_FOREACH(route, nexthop->routes)

13
test/test-network/systemd-networkd-tests.py
View File

@ -4798,11 +4798,18 @@ class NetworkdNetworkTests(unittest.TestCase, Utilities):
# Remove nexthop with ID 20
check_output('ip nexthop del id 20')
# Check the nexthop ID 20 is dropped from the group nexthop.
output = check_output('ip -0 nexthop list id 21')
print(output)
self.assertRegex(output, r'id 21 group 1,3')
# Remove nexthop with ID 21
check_output('ip nexthop del id 21')
copy_network_unit('11-dummy.netdev', '25-nexthop-test1.network')
networkctl_reload()
# 25-nexthop-test1.network requests a route with nexthop ID 21,
# which is silently removed by the kernel when nexthop with ID 20 is removed in the above,
# 25-nexthop-test1.network requests a route with nexthop ID 21, which is removed in the above,
# hence test1 should be stuck in the configuring state.
self.wait_operstate('test1', operstate='routable', setup_state='configuring')
@ -4811,7 +4818,7 @@ class NetworkdNetworkTests(unittest.TestCase, Utilities):
output = networkctl_status('test1')
self.assertIn('State: routable (configuring)', output)
# Check if the route which needs nexthop 20 and 21 are forgotten.
# Check if the route which needs nexthop 21 are forgotten.
output = networkctl_json()
check_json(output)
self.assertNotIn('"Destination":[10.10.10.14]', output)