This fixes some typos in the documentation, both grammar as well as
incorrect field names.
It also changes the casing of CheckSum to Checksum in L2TP to match
other casings.
- Also configures route to the gateway and prefix route in the specified
table, if necessary.
- Also set preferred source address of the route.
Closes#36168.
"Recently" (as of 5.18) the Linux kernel gained the ability of locking
bridge ports to restrict network access to authenticated hosts only.
This is implemented by disabling automated learning and dropping
incoming traffic from unknown hosts. User space is then expected to add
fdb entries for authenticated hosts. Once a fdb entry exist, traffic for
that host will be forwarded as expected.
This was later extended with "Mac Authentication Bypass", where the
locking was extended to fdb entries. In this mode the kernel adds fdb
entries again automatically, but they are locked by default.
To properly configure this, add two network options and one netdev
option:
* `LinkLocalLearning=` to prevent the kernel from creating unlocked
entries based on link-local traffic, which would bypass any
authentication. Needed when enabling learning on a locked port.
* `Locked=` to allow setting a bridge port to locked.
* `MACAuthenticationBypass=` to allow enabling Mac Authentication
Bypass on a port. Requires learning to be enabled on the port as well
(and consequently `LinkLocalLearning` disabled on the bridge).
An authenticator (e.g. hostapd) is still needed to do the actual
authentication, the kernel only provides the access control.
Since linux commit a35ec8e38cdd1766f29924ca391a01de20163931 ("bridge:
Add MAC Authentication Bypass (MAB) support"), included since v6.2, it
is possible to enable MAC Authentication Bypass for bridge ports. In
this mode the locked port learns again, but the learned fdb entries are
locked, allowing user space to unlock hosts based seen MAC addresses.
This requires learning to be enabled on the port, and link-local
learning disabled for the bridge.
Add support to systemd-network for setting the new attribute for bridge
ports.
Since linux commit a21d9a670d81103db7f788de1a4a4a6e4b891a0b ("net:
bridge: Add support for bridge port in locked mode"), included since
v5.18, it is possible to set bridge ports to locked.
Locked ports do not learn automatically, and discard any traffic from
unknown source MACs. To allow traffic, the userspace authenticator is
expected to create fdb entries for authenticated hosts.
Add support to systemd-network for setting the new attribute for bridge
ports.
When using locked ports on a bridge link-local learning needs to be
disabled to prevent the kernel from learning and automatically unlocking
hosts based on link-local traffic.
So add support for enabling NO_LL_LEARN for bridges.
Otherwise, if networkd is failed, e.g. .network files that triggered the
failure will remain, and the next test case will start with previous
.network files. So, most subsequent test will fail.
Otherwise, nexthop ID may contain e.g. 300, then
===
AssertionError: '300' unexpectedly found in
'default nhid 3860882700 via fe80::1034:56ff:fe78:9a99 proto ra metric 512 expires 1798sec pref high\n
default nhid 2639230080 via fe80::1034:56ff:fe78:9a98 proto ra metric 2048 expires 1798sec pref low'
===
Previously, when multiple routers send RAs with the same preference,
then the kernel merges routes with the same gateway address:
===
default proto ra metric 1024 expires 595sec pref medium
nexthop via fe80::200:10ff:fe10:1060 dev enp0s9 weight 1
nexthop via fe80::200:10ff:fe10:1061 dev enp0s9 weight 1
===
This causes IPv6 Conformance Test v6LC.2.2.11 failure, as reported in #33470.
To avoid the coalescing issue, we can use nexthop, as suggested by Ido Schimmel:
https://lore.kernel.org/netdev/ZytjEINNRmtpadr_@shredder/
> BTW, you can avoid the coalescing problem by using the nexthop API.
> # ip nexthop add id 1 via fe80::200:10ff:fe10:1060 dev enp0s9
> # ip -6 route add default nhid 1 expires 600 proto ra
> # ip nexthop add id 2 via fe80::200:10ff:fe10:1061 dev enp0s9
> # ip -6 route append default nhid 2 expires 600 proto ra
> # ip -6 route
> fe80::/64 dev enp0s9 proto kernel metric 256 pref medium
> default nhid 1 via fe80::200:10ff:fe10:1060 dev enp0s9 proto ra metric 1024 expires 563sec pref medium
> default nhid 2 via fe80::200:10ff:fe10:1061 dev enp0s9 proto ra metric 1024 expires 594sec pref medium
Fixes#33470.
Suggested-by: Ido Schimmel <idosch@idosch.org>
- fix verifiers in test_router_preference() to make them actually check
if unnecessary routes are removed,
- stop radv in test_ndisc_vs_static_route() before checking if the static
route is preserved even when the router sends a RA with zero lifetime,
- make verifiers in NetworkdIPv6PrefixTests stricter.
Follow-up for 451c2baf30.
With the commits, reloading .network files does not release previously
acquired DHCP lease and friends if possible.
On graceful reconfigure triggered by the reload, the interface may
acquire a new DHCPv4 lease earlier than DHCPv6 lease. In that case,
the check will fail as it is done with the new DHCPv4 lease and old
DHCPv6 lease, which does not contain any IPv6 DNS servers or so.
So, when switching from no -> yes, we need to wait a new lease with DNS
servers or so. To achieve that, we need to clean reconfigure the interface.
Follow-up for 451c2baf30.
With the commits, reloading .network files does not release previously
acquired DHCP lease and friends if possible. If previously a DHCP client
was configured as not requesting DNS servers or so, then the previously
acquired lease might not contain any DNS servers. In that case, if the
new .network file enables UseDNS=, then the interface should enter the
configured state after a new lease is acquired. To achieve that, we need
to reset the flags.
With this change, the workaround applied to the test by the commit
451c2baf30 can be dropped.
E.g. when a .network file is updated, but DHCP setting is unchanged, it
is not necessary to drop acquired DHCP lease.
So, let's not stop DHCP client and friends in link_reconfigure_impl(),
but stop them later when we know they are not necessary anymore.
Still DHCP clients and friends are stopped and leases are dropped when
the explicit reconfiguration is requested
Currently, if for example a traffic control object already exist, networkd
will silently do nothing, even if the settings in the network file for the
traffic control object have changed. Let's instead replace the object if it
already exists so that new settings from the network file are applied as
expected.
Fixes#31226
