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New directive `NFTSet=` provides a method for integrating network configuration
into firewall rules with NFT sets. The benefit of using this setting is that
static network configuration or dynamically obtained network addresses can be
used in firewall rules with the indirection of NFT set types. For example,
access could be granted for hosts in the local subnetwork only. Firewall rules
using IP address of an interface are also instantly updated when the network
configuration changes, for example via DHCP.
This option expects a whitespace separated list of NFT set definitions. Each
definition consists of a colon-separated tuple of source type (one of
"address", "prefix", or "ifindex"), NFT address family (one of "arp", "bridge",
"inet", "ip", "ip6", or "netdev"), table name and set name. The names of tables
and sets must conform to lexical restrictions of NFT table names. The type of
the element used in the NFT filter must match the type implied by the
directive ("address", "prefix" or "ifindex") and address type (IPv4 or IPv6)
as shown type implied by the directive ("address", "prefix" or "ifindex") and
address type (IPv4 or IPv6) must also match the set definition.
When an interface is configured with IP addresses, the addresses, subnetwork
masks or interface index will be appended to the NFT sets. The information will
be removed when the interface is deconfigured. systemd-networkd only inserts
elements to (or removes from) the sets, so the related NFT rules, tables and
sets must be prepared elsewhere in advance. Failures to manage the sets will be
ignored.
/etc/systemd/network/eth.network
```
[DHCPv4]
...
NFTSet=prefix:netdev:filter:eth_ipv4_prefix
```
Example NFT rules:
```
table netdev filter {
set eth_ipv4_prefix {
type ipv4_addr
flags interval
}
chain eth_ingress {
type filter hook ingress device "eth0" priority filter; policy drop;
ip saddr != @eth_ipv4_prefix drop
accept
}
}
```
```
$ sudo nft list set netdev filter eth_ipv4_prefix
table netdev filter {
set eth_ipv4_prefix {
type ipv4_addr
flags interval
elements = { 10.0.0.0/24 }
}
}
```
This reverts commits 89e73ce86fb115c2e319bf9f28b63efad2975495 and
543d2a4d45ba199a62c87b3bf69dfd4ff55abf0c.
The commit assign "custom" to fixed DUID type 5. When making DUID fully
configurable, the type number should be also configurable. Also, the
fully custom DUID should be acceptable for DHCPv4.
- add reference to the service unit in the man page,
- fix several indentation and typos,
- replace '(uint64_t) -1' with 'UINT64_MAX',
- drop unnecessary 'continue'.
- rename TCPRetransmissionTimeOutSec= -> TCPRetransmissionTimeoutSec,
- refuse infinity,
- fix the input value verifier (USEC_PER_SEC -> USEC_PER_MSEC),
- use DIV_ROUND_UP() when assigning the value.
Follow-ups for 1412d4a4fea234fd2afda26b1241cd700246a672.
Closes#28898.
The kernel default for tmpfs mounts is rwxrwxrwt, i.e. world-writable with the
sticky bit set. This makes sense for /tmp and /var/tmp, but less so for other
directories. Users will not use systemd-mount to mount /tmp and /var/tmp, so
the existing behaviour is surprising. The defaults are overriden to the
same defaults we use for "internal tmpfs mounts", i.e. no sticky bit, nosuid,
nodev, and limits of size=10%, nr_inodes=400k.
--tmpfs is new, so we can modify the behaviour without breaking compatibility.
Mount units can do it, but the command line tool cannot, as it needs a
valid 'what'. If --tmpfs/-T if passed, parse the argument as 'where'
and send a literal 'tmpfs' as the 'what' if not specified.
This metadata (EXTENSION_RELOAD_MANAGER) can be set to "1" to reload the manager
when merging/refreshing/unmerging a system extension image. This can be useful in case the sysext
image provides systemd units that need to be loaded.
With `--no-reload`, one can deactivate the EXTENSION_RELOAD_MANAGER metadata interpretation.
Signed-off-by: Mathieu Tortuyaux <mtortuyaux@microsoft.com>
After f58269510727964cb5c10e7d2f9849c442ea1f80, the wrong behavior
occurred when --since= and --lines= are both specified is fixed.
However, it seems that the old behavior is already being somewhat
widely used, and the function itself makes sense, i.e. to allow --lines=
to output the first N journal entries.
Therefore, let's support prefixing the number for --lines= with '+',
and provide such functionality.
Related: #28746
This setting indicates which directories in the target partition
should be btrfs subvolumes. If set, we'll try to create these
directories as subvolumes.
Note that this only works when running as root without --offline,
as mkfs.btrfs does not support creating subvolumes.
This makes tmpfiles, sysusers, and udevd invoked in the following order:
1. systemd-tmpfiles-setup-dev-early.service
Create device nodes gracefully, that is, create device nodes anyway
by ignoring unknown users and groups.
2. systemd-sysusers.service
Create users and groups, to make later invocations of tmpfiles and
udevd can resolve necessary users and groups.
3. systemd-tmpfiles-setup-dev.service
Adjust owners of previously created device nodes.
4. systemd-udevd.service
Process all devices. Especially to make block devices active and can
be mountable.
5. systemd-tmpfiles-setup.service
Setup basic filesystem.
Follow-up for b42482af904ae0b94a6e4501ec595448f0ba1c06.
Fixes#28653.
Replaces #28681 and #28732.
Follow-up for: 947d836a6e86f1936250ff8e3c67fa33b92a597f
(I guess in the original patch authors usecase the root fs actually
*does* remain in memory, but that's a special case and does not belong
in the man pages this way).
This is a magic string, and we should avoid stepping into the territory
of normal keymap names with that, given that users can pick names
otherwise freely.
Hence, prefix the name with a special char to avoid any namespace
issues.
Follow-up for: #28660
