tree-wide: remove Emacs lines from all files This should be handled fine now by .dir-locals.el, so need to carry that stuff in every file.

networkd: optinally use DHCP lease domain info for routing only This changes the UseDomains= setting of .network files to take an optional third value "route", in addition to the boolean values. If set, the passed domain information is used for routing rules only, but not for the search path logic.

networkd: rename a few Network object properties to be more like the configuration settings All booleans called dhcp_xyz are now called ".dhcp_use_xyz", to match their respective configuration file settings. This should clarify things a bit, in particular as there is a DHCP hostname that was previously called just ".hostname" because ".dhcp_hostname" was already existing as a bool. Since this confusion is removed now because the bool is called ".dhcp_use_hostname", the string field is now renamed to ".dhcp_hostname".

networkd: rework Domains= setting Previously, .network files only knew a vaguely defined "Domains=" concept, for which the documentation declared it was the "DNS domain" for the network connection, without specifying what that means. With this the Domains setting is reworked, so that there are now "routing" domains and "search" domains. The former are to be used by resolved to route DNS request to specific network interfaces, the latter is to be used for searching single-label hostnames with (in addition to being used for routing). Both settings are configured in the "Domains=" setting. Normal domain names listed in it are now considered search domains (for compatibility with existing setups), while those prefixed with "~" are considered routing domains only. To route all lookups to a specific interface the routing domain "." may be used, referring to the root domain. An alternative syntax for this is the "*", as was already implemented before using the "wildcard" domain concept. This commit adds proper parsers for this new logic, and exposes this via the sd-network API. This information is not used by resolved yet, this will be added in a later commit.

resolved: introduce support for per-interface negative trust anchors

resolved,networkd: add a per-interface DNSSEC setting This adds a DNSSEC= setting to .network files, and makes resolved honour them.

networkd,resolved: add a per-interface mdns configuration option

networkd: Add support to configure IPV6 hop limit This patch adds support to configure IPV6 hop limit. For example: /proc/sys/net/ipv6/conf/wlp3s0/hop_limit

networkd: link - deserialize For now only deserialize some basic state and the applied addresses. When a link is added, try to deserialize it's state from /run. This is relevant only when networkd is restarted at runtime.

networkd: route - clean up confusion between 'metric' and 'priority' Different tools use different terms for the same concept, let's try to stick with 'priority', as that is what the netlink API uses.

networkd: route - rename fields in struct

util-lib: split out allocation calls into alloc-util.[ch]

util-lib: move string table stuff into its own string-table.[ch]

util-lib: split stat()/statfs()/stavfs() related calls into stat-util.[ch]

util-lib: split string parsing related calls from util.[ch] into parse-util.[ch]

util-lib: split out fd-related operations into fd-util.[ch] There are more than enough to deserve their own .c file, hence move them over.

util-lib: split our string related calls from util.[ch] into its own file string-util.[ch] There are more than enough calls doing string manipulations to deserve its own files, hence do something about it. This patch also sorts the #include blocks of all files that needed to be updated, according to the sorting suggestions from CODING_STYLE. Since pretty much every file needs our string manipulation functions this effectively means that most files have sorted #include blocks now. Also touches a few unrelated include files.

networkd: manager/link - only serialize once per event-loop iteration Every time the state is written out we may trigger third-party apps, so let's be a bit more careful about writing this out unnecessarily.

networkd: add support for configure IPv6 DAD Configures Ipv6 Duplicate Address Detection. 10

networkd: link/network - correctly align log messages

tree-wide: clean up log_syntax() usage - Rely everywhere that we use abs() on the error code passed in anyway, thus don't need to explicitly negate what we pass in - Never attach synthetic error number information to log messages. Only log about errors we *receive* with the error number we got there, don't log any synthetic error, that don#t even propagate, but just eat up. - Be more careful with attaching exactly the error we get, instead of errno or unrelated errors randomly. - Fix one occasion where the error number and line number got swapped. - Make sure we never tape over OOM issues, or inability to resolve specifiers

networkd:add support to configure ipv6 acceprt ra This patch support to configure the ipv6 acceprt ra option. for more information see http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO/proc-sys-net-ipv6..html

tree-wide: do not shadow the global var timezone

networkd: emit DNS/NTP/Timezone info via DHCP server by default If we have the data, emit it by default.

dhcp,network: support emitting DNS/NTP server information from DHCP server For now, this is very simple and IP addresses have to be configured manually.

networkd: split up networkd.h into per-object header files No functional changes, just moving definitions into separate header files.

dhcp,network: implement RFC 4833 (DHCP Timezone option) This one is simply to add: encode the tzdata timezone in the DHCP options and optionally make use of it.

networkd: don't leak memory of Hostname= is used twice in a .network file Also, we should only accept trailing dots where we have to, but not everywhere, hence be more strict when validating configured hostnames.

sd-network: make LLMNR specific config parser generic Rename the enum, the lookup functions and the parser for LLMNRSupport so the type can be reused for mDNS.

hostname-util: get rid of unused parameter of hostname_cleanup() All users are now setting lowercase=false.

networkd: allow trailing dot on fqdn in config file

hostname-util: add relax parameter to hostname_is_valid Tests are modified to check behaviour with relax and without relax. New tests are added for hostname_cleanup(). Tests are moved a new file (test-hostname-util) because there's now a bunch of them. New parameter is not used anywhere, except in tests, so there should be no observable change.

networkd: add support for macvtap This patch add support for macvtap. see http://virt.kernelnewbies.org/MacVTap

networkd: rename RootBlock to AllowPortToBeRoot Justification is similar to BPDUGuard rename. "Positive" values are easier. This is a rather uncommon option, so using a slightly longer name should not be a problem, and may in fact may make it easier to guess what the option does without reading the documentation.

networkd: turn UnicastFlood on by default Looking at the kernel commit, "on" seems to be the default value: commit 867a59436fc35593ae0e0efcd56cc6d2f8506586 Author: Vlad Yasevich <vyasevic@redhat.com> Date: Wed Jun 5 10:08:01 2013 -0400 bridge: Add a flag to control unicast packet flood. Add a flag to control flood of unicast traffic. By default, flood is on and the bridge will flood unicast traffic if it doesn't know the destination. When the flag is turned off, unicast traffic without an FDB will not be forwarded to the specified port. ... and it seems to be the reasonable thing to do by default.

networkd: rename BPDUGuard to UseBPDU Rename to follow the follow the style of other options. In general "positive" options are preferred to "negative" ones, because they are easier to describe and easier for humans to parse (c.f. the shortening on the man page entry).

networkd: DHCP override hostname This patch enhances the DHCP client to send the hostname reference http://lists.freedesktop.org/archives/systemd-devel/2014-July/021550.html Tested with Example conf: [Match] Name=eth1 [Network] DHCP=v4 [DHCP] SendHostname=true Hostname=test

networkd: various fixes for the IPv6 privacy extensions support - Make sure that the IPv6PrivacyExtensions=yes results in prefer-temporary, not prefer-public. - Introduce special enum value "kernel" to leave setting unset, similar how we have it for the IP forwarding settings. - Bring the enum values in sync with the the strings we parse for them, to the level this makes sense (specifically, rename "disabled" to "no", and "prefer-temporary" to "yes"). - Make sure we really set the value to to "no" by default, the way it is already documented in the man page. - Fix whitespace error. - Make sure link_ipv6_privacy_extensions() actually returns the correct enum type, rather than implicitly casting it to "bool". - properly size formatting buffer for ipv6 sysctl value - Don't complain if /proc/sys isn't writable - Document that the enum follows the kernel's own values (0 = off, 1 = prefer-public, 2 = prefer-temporary) - Drop redundant negating of error code passed to log_syntax() - Manpage fixes This fixes a number of issues from PR #417

networkd: Add support for ipv6 privacy extension This patch add support for ipv6 privacy extensions. The variable /proc/sys/net/ipv6/conf/<if>/use_tempaddr can be changed via the boolean IPv6PrivacyExtensions=[yes/no/prefer-temporary] When true enables privacy extensions, but prefer public addresses over temporary addresses. prefer-temporary prefers temporary adresses over public addresses. Defaults to false. [Match] Name=enp0s25 [Network] IPv6PrivacyExtensions=prefer-temporary

networkd: create "kernel" setting for IPForwarding In 5a8bcb674f71a20e95df55319b34c556638378ce, IPForwarding was introduced to set forwarding flags on interfaces in .network files. networkd sets forwarding options regardless of the previous setting, even if it was set by e.g. sysctl. This commit creates a new option for IPForwarding, "kernel", that preserves the sysctl settings rather than always setting them. See https://bugs.freedesktop.org/show_bug.cgi?id=89509 for the initial bug report.

libsystemd-network: use domain validation instead of hostname validation for dhcp domain option previously hostname_is_valid was used to validate domain names, which would silently drop perfectly valid dns names that were longer than a single dns label.

util: split all hostname related calls into hostname-util.c

networkd: network_get - allow udev_device to be NULL In containers we never have udev devices, so drop the assert. This fixes an assertion introduced in af3aa302741b6edb0729925febb5f8bc26721fe3.

networkd: introduce vti6 tunnel This patch add support to create vti6 tunnel test: vt6.network [Match] Name=wlan0 [Network] Tunnel=ip6vti vti6.netdev [NetDev] Name=ip6vti Kind=vti6 [Tunnel] Local=2a00:ffde:4567:edde::4987 Remote=2001:473:fece:cafe::5179 ip link 11: ip6_vti0@NONE: <NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default link/tunnel6 :: brd :: 12: ip6vti@wlan0: <POINTOPOINT,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default link/tunnel6 2a00:ffde:4567:edde::4987 peer 2001:473:fece:cafe::5179

networkd: improve how networkd logs things This makes adds a couple of fixes: - Introduces log_netdev_error_errno() and friends, which takes an error number, and matches what log_link_error_errno() and friends do. - Replaces a lof ot strerror() usage with log_netdev_error_errno(), log_link_error_errno() and log_erro_errno() - Uppercases the first character of many log messages, after all this is supposed to be english language - Drops manual negating of error codes before passing them to log functions, the log functions all do that internally anyway. Some other minor fixes. Behaviour should not change really.

network: don't pass NULL to udev_device_get_driver()

Use space after a silencing (void) We were using a space more often than not, and this way is codified in CODING_STYLE.

networkd: Make DHCP client ID creation configurable

networkd: add support for Uplink Failure Detection Introduce BindCarrier= to indicate the set of links that determine if the current link should be brought UP or DOWN. [tomegun: add a bit to commit message]

remove unused includes This patch removes includes that are not used. The removals were found with include-what-you-use which checks if any of the symbols from a header is in use.

networkd: network - rename ipv6token parser Too generic name.

net: support globbing and disjunction in Match logic Match{Name,OrginalName,Type,Driver,Path} can now take a space-separated glob of matches.

treewide: correct typos and use consistent "MAC" spelling

networkd: add support for IPv6 tokens This allows the admin to set the host-specific part of IPv6 addresses, but still receive the prefix via SLAAC. .network file snippet: [Network] IPv6Token=::12 gives: $ ip token token ::12 dev eth0 This closes https://bugs.freedesktop.org/show_bug.cgi?id=81177.

networkd: generalize IPv4LL to LinkLocal This allows both IPv4 and IPv6 link-local addresses to be enabled or disabled. By default we still enable IPv6LL and disable IPv4LL. The old config option is kept for backwards compatibility, but removed from the documentation.

networkd: add network_get_by_name

networkd: Introduce ip6gre and ip6gretap This patch introduces ipv6 gre and gretap. test: ip6gre.netdev: [NetDev] Name=ip6gretap Kind=ip6gretap [Tunnel] Local=2a00:ffde:4567:edde::4987 Remote=2001:473:fece:cafe::5179 ip6gre.network: [Match] Name=eno16777736 [Network] Tunnel=ip6gretap ip link 6: ip6gre@eno16777736: <POINTOPOINT,NOARP> mtu 1448 qdisc noop state DOWN mode DEFAULT group default link/gre6 2a:00:ff:de:45:67:ed:de:00:00:00:00:00:00:49:87 peer 20:01:04:73:fe:ce:ca:fe:00:00:00:00:00:00:51:79

networkd: Introduce IP6 tunnel This patch enables networkd to create IP6 tunnels example conf: ipip6.netdev: [NetDev] Name=ipip6-tunnel Kind=ip6tnl [Tunnel] Mode=ip4ipv6 Local=2a00:ffde:4567:edde::4987 Remote=2001:473:fece:cafe::5179 ipip6.network [Match] Name=wlan0 [Network] Tunnel=ipip6-tunnel 23: ipip6-tunnel@wlan0: <POINTOPOINT,NOARP> mtu 1452 qdisc noop state DOWN mode DEFAULT group default link/tunnel6 2a00:ffde:4567:edde::4987 peer 2001:473:fece:cafe::5179

networkd: introduce gretap This patch introdeces gretap to networkd

networkd: netdev - add ipvlan support

networkd: make IP forwarding for IPv4 and IPv6 individually configurable

networkd: introduce an AddressFamilyBoolean enum type This introduces am AddressFamilyBoolean type that works more or less like a booleaan, but can optionally turn on/off things for ipv4 and ipv6 independently. THis also ports the DHCP field over to it.

networkd: add minimal IP forwarding and masquerading support to .network files This adds two new settings to networkd's .network files: IPForwarding=yes and IPMasquerade=yes. The former controls the "forwarding" sysctl setting of the interface, thus controlling whether IP forwarding shall be enabled on the specific interface. The latter controls whether a firewall rule shall be installed that exposes traffic coming from the interface as coming from the local host to all other interfaces. This also enables both options by default for container network interfaces, thus making "systemd-nspawn --network-veth" have network connectivity out of the box.

networkd: add FDB support

networkd: rename section [BridgePort] → [Bridge] Let's stick to generic sections that describe the general technology, instead of specific per-object sections, unless we really have a reason to do that otherwise.

udev: link-config - simplify net-match

Check return value from reading name_assign_type attr This file won't exist on kernels earlier than 3.17.

net_setup/networkd: warn if matching is done on possibly unstable ifname

networkd: add basic [Link] settings to .network files This allows the default link settings (set in .link files) to be overridden per Network. Only MTU and MACAddress is supported for now.

udev: net_setup - allow matching on OriginalName= This has been requested repeatedly, so let's give it a go. We explicitly do not allow matching on names that have already been changed (from a previous udev run, or otherwise), and matching on unpredictable names (ethX) is discouraged (but not currently disallowed). We also currently allow: [Match] Name=veth0 [Link] Name=my-name0 SomeOtherSetting=true Which means that the link file will be applied the first time it is invoked, but not on subsequent invocations, which may be surprising.

networkd: Add bridge port path cost This patch add support to specify path cost of the bridge port to be configured via conf file. Exampe: conf file: br.netdev [NetDev] Name=br-test Kind=bridge file: br.network [Match] Name=em1 [Network] Bridge=br-test [BridgePort] Cost=332 bridge link 2: em1 state UP : <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 master br-test state disabled priority 32 cost 332

treewide: yet more log_*_errno + return simplifications Using: find . -name '*.[ch]' | while read f; do perl -i.mmm -e \ 'local $/; local $_=<>; s/(if\s*\([^\n]+\))\s*{\n(\s*)(log_[a-z_]*_errno\(\s*([->a-zA-Z_]+)\s*,[^;]+);\s*return\s+\g4;\s+}/\1\n\2return \3;/msg; print;' $f done And a couple of manual whitespace fixups.

treewide: no need to negate errno for log_*_errno() It corrrectly handles both positive and negative errno values.

treewide: auto-convert the simple cases to log_*_errno() As a followup to 086891e5c1 "log: add an "error" parameter to all low-level logging calls and intrdouce log_error_errno() as log calls that take error numbers", use sed to convert the simple cases to use the new macros: find . -name '*.[ch]' | xargs sed -r -i -e \ 's/log_(debug|info|notice|warning|error|emergency)\("(.*)%s"(.*), strerror\(-([a-zA-Z_]+)\)\);/log_\1_errno(-\4, "\2%m"\3);/' Multi-line log_*() invocations are not covered. And we also should add log_unit_*_errno().

hashmap: introduce hash_ops to make struct Hashmap smaller It is redundant to store 'hash' and 'compare' function pointers in struct Hashmap separately. The functions always comprise a pair. Store a single pointer to struct hash_ops instead. systemd keeps hundreds of hashmaps, so this saves a little bit of memory.

networkd: allow specification of DHCP route metric This lets the routing metric for links to be specified per-network, still defaulting to DHCP_ROUTE_METRIC (1024) if unspecified. Hopefully this helps with multiple interfaces configured via DHCP.

networkd: fix use-after-free Elements must be removed from the hashtable before they are freed.

networkd: print nice warnings if people configure invalid domain names

networkd: fix minor memory leak

networkd: remove "*" from domains list Also, simplify things a bit and make sure we don't forget looking at one of the entries.

sd-network: add support for wildcard domains

networkd: add support for Domains= to .network files This allows the search/routing domanis to be specified per link/network and be passed on to resolved.

networkd: don't respect domainname from DHCP by default Most routers will send garbage, so make this opt-in only.

networkd: disable ipv4ll default routes by default This causes machines without connectivity to hang where they would otherwise fail. Keep it opt-in for now, but consider whether we sholud just drop it.

networkd: split out networkd-link.h

networkd: add and expose per-link LLMNR config option

networkd: route/address - use trivial hash functions

networkd: unify handling of stacked netdevs

networkd: ipv4ll - default to setting up ipv4ll routes This is necessary for non-ipv4ll hosts to communicate with ipv4ll-only hosts on the same link. Defaults to being enabled, but can be opted out. See: <http://avahi.org/wiki/AvahiAutoipd#Routes>

networkd: merge DNS and NTP entries when exporting In the state files, do not distinguish where the various entries came from (static or DHCP), but include them all in the same list.

networkd: netdev - split NetDev struct into per-kind structs Similarly to how unit types work.

Be more careful when checking for empty files If we want to avoid reading a totally empty file, it seems better to check after we have opened the file, not before.

Let config_parse open file where applicable Special care is needed so that we get an error message if the file failed to parse, but not when it is missing. To avoid duplicating the same error check in every caller, add an additional 'warn' boolean to tell config_parse whether a message should be issued. This makes things both shorter and more robust wrt. to error reporting.

Constify ConfigTableItem tables

networkd: netdev - introduce vtable for netdev kinds Split each netdev kind into its own .h/.c.

networkd: dhcp add vendor class indentifier option 60 Vendor Class Identifier be used by DHCP clients to identify their vendor type and configuration. When using this option, vendors can define their own specific identifier values, such as to convey a particular hardware or operating system configuration or other identifying information. Vendor-specified DHCP options—features that let administrators assign separate options to clients with similar configuration requirements. For example, if DHCP-aware clients for example we want to separate different gateway and option for different set of people (dev/test/hr/finance) in a org or devices for example web/database servers or let's say in a embedded device etc and require a different default gateway or DNS server than the rest of clients.

networkd: accept section DHCP in systemd.network files

networkd: send hostname to dhcp server Send hostname (option 12) in DISCOVER and REQUEST messages so the DHCP server could use it to register with dynamic DNS and such. To opt-out of this behaviour set SendHostname to false in [DHCP] section of .network file [tomegun: rebased, made sure a failing set_hostname is a noop and moved config from DHCPv4 to DHCP]

Add support for DHCP static route options This adds support for DHCP options 33 and 121: Static Route and Classless Static Route. To enable this feature, set UseRoutes=true in .network file. Returned routes are added to the routing table.

networkd: unref tunnel Unref tunnel while shutting down

networkd: introduce vxlan This patch enables netwokd to create vxlan Changes: Added: 1. File networkd networkd-vxlan.c 2. to netdev bool learning struct in_addr group uint64_t vxlanid; 3. VXLAN subsection and config parameters

networkd: link - left-align debug messages Still add some whitespace betwen ifname and the message to get the messages aligned (as I find it easier to spot specific messages this way).

networkd: introduce vti tunnel This patch enables vti tunnel support. example conf: file : vti.netdev [NetDev] Name=vti-tun Kind=vti MTUBytes=1480 [Tunnel] Local=X.X.X.X Remote=X.X.X.X file: vti.network [Match] Name=em1 [Network] Tunnel=vti-tun TODO: Add more attributes for vti tunnel IFLA_VTI_IKEY IFLA_VTI_OKEY

networkd/sd-network: expose statically configured NTP servers

resolved: add daemon to manage resolv.conf Also remove the equivalent functionality from networkd.

networkd: network - store DNS servers in List rather than Set This way we preserve the order of preference.

networkd: rename Address and Route list fields

networkd: logging - align messages

networkd: rename NetDev variable for consistency with Link

networkd: introduce ipip tunnel This patch enables basic ipip tunnel support. It works with kernel module ipip example conf: file: ipip.netdev [NetDev] Name=ipip-tun Kind=ipip MTUBytes=1480 [Tunnel] Local=192.168.223.238 Remote=192.169.224.239 TTL=64 file: ipip.network [Match] Name=em1 [Network] Tunnel=ipip-tun [tomegun: - drop unused variable - take ref when enslaving]

networkd: network - fix leak

networkd: network - do reference counting on netdevs

networkd: network - merge all netdev parsing into one function

network: implement masking of .link, .network and .netdev files

networkd: tie links to rtnl rather than udev This essentially swaps the roles of rtnl and udev in networkd. After this change libudev is only used for waiting for udev to initialize devices and to get udev-specific information needed for some [Match] attributes. This in particular simplifies the code in containers where udev is not really useful, but also simplifies things and reduces round-trips in the non-container case.

Fix a few return codes in error paths

networkd: fix a couple of memory leaks

libsystemd-network: move network-utils from src/shared This does not belong in shared as it is mostly a detail of our networking subsystem. Moreover, now we can use libudev here, which will simplify things.

networkd: allow more than one static DNS server

network: link - simplify code a bit and remove some debug logging

networkd: add basic support for MACVLANs

net-util: match on the driver as exposed by ethtool if DRIVER not set Also fix a copy-paste error that broke matching on interface name.

.network/.netdev/.link: allow to match on architecture

networkd: netdev - allow filtering on kernel cmdline, host and virt

network/link: Match - filter on kernel cmdline, host and virt

net-match: fix Driver= match It should match on the driver of the parent device.

networkd: VLAN - allow multiple vlans to be created on a link Also limit the range of vlan ids. Other implementations and documentation use the ranges {0,1}-{4094,4095}, but we use the one accepted by the kernel: 0-4094. Reported-by: Oleksii Shevchuk <alxchk@gmail.com>

networkd: netdev - rename Netdev to NetDev Both in the configuration file format and everywhere else in the code.

net-util: verify the address family Error out if the address family is already set to something incompatible with the address being parsed.

networkd: add basic VLAN support

networkd: add basic bonding support Refactor bridging support to be generic netdev support and extend it to cover bonding as well.

networkd: dhcp - by default ignore the MTU

sd-dhcp-client/networkd: add domainname support

sd-dhcp-client/networkd: add transient hostname support

sd-dhcp-client/networkd: add interface MTU support

networkd: DHCPv4 - allow opting out of using DNS servers Setting UseDNS=no will ignore any received DNS servers.

networkd: generate resolv.conf This adds support to generate a basic resolv.conf in /run/systemd/network. This file will not take any effect unless a symlink is created from /etc/resolv.conf. Nameservers received over DHCP takes precedence over statically configured ones. Note: /etc/resolv.conf is severely limited, so in the future we will likely rather provide a much more powerfull nss plugin (or something to that effect), but this should allow current users to function without any loss of functionality.

networkd: don't automatically reload config at runtime We don't know if the config will be consistent, so do as systemd itself and only load config when the daemon starts (and possibly, in the future, when explicitly requested).

No need to canonicalize fixed paths

networkd: refuse to use .network files with missing Address/Gateway key These keys are mandatory in [Address]/[Route] sections. Otherwise, we hit an assert: ens3: setting addresses Assertion 'address->family == 2 || address->family == 10' failed at /build/amd64-generic/tmp/portage/sys-apps/systemd-9999-r1/work/systemd-9999/src/network/networkd-address.c:137, function address_configure(). Aborting. Reported-by: Alex Polvi <alex.polvi@coreos.com> At the same time make sure Route's Destination and Gateway uses the same address family.

networkd: fix memory leak in error path

networkd: do not deference null pointer in cleanup

networkd: improve logging Remove redundant messages, add some debugging ones and make wording more uniform.

networkd: distinguish between static and dynamic addresses/routes Static addresses/routes are associated with a network. Dynamic addresses/routes are associtade with links (as the corresponding network may be shared by several links).

network: more asserts to shut up scan-build

networkd: add bridge support A bridge is specified in a .netdev file with a section [Bridge] and at least the entry Name=. A link may be joined to a bridge if the .network applied to it has a Bridge= entry giving the name of the bridge in its [Network] section. We eagerly create all bridges on startup, and links are added to bridges as soon as they both appear.

networkd: use correct printf formatter uint64_t can be formatted correctly with %ju, rather than casting to unsigned and potentially losing accuracy.

networkd: add support for [Address] sections This will allow specifying more options per address than the simple Address= entry in the [Network] section. Preliminary support for the same functionality for [Route] sections are added, but not yet hooked up, as more testing is needed.

networkd: make sure Network and Link can always be freed Also, don't fail a link just because we can't find its MAC address.

networkd: make sure Links and Networks are freed

networkd: make all calls async

networkd: add a basic network daemon This daemon listens for and configures network devices tagged with 'systemd-networkd'. By default, no devices are tagged so this daemon can safely run in parallel with existing network daemons/scripts. Networks are configured in /etc/systemd/network/*.network. The first .network file that matches a given link is applied. The matching logic is similar to the one for .link files, but additionally supports matching on interface name. The mid-term aim is to provide an alternative to ad-hoc scripts currently used in initrd's and for wired setups that don't change much (e.g., as seen on servers/and some embedded systems). Currently, static addresses and a gateway can be configured. Example .network file: [Match] Name=wlp2s0 [Network] Description=My Network Gateway=192.168.1.1 Address=192.168.1.23/24 Address=fe80::9aee:94ff:fe3f:c618/64