DHCPv6 requires an IPv6 link-local address to work. The client will not be started (even when enabled explicitly with `DHCP=`) if none is configured (either by autoconfiguration or manually). Therefore, disable IPv6 in such case.
Although networkd has option (LinkLocalAddressing=) to toggle IPv6LL autoconfiguration, when it is enabled, the address is autoconfigured by the kernel, but not networkd.
Therefore, we do not statically set IFLA_INET6_ADDR_GEN_MODE to IN6_ADDR_GEN_MODE_EUI64, but dynamically depending on whether stable_secret is set, just as what the kernel does by default.
Note that this does NOT affect the global addresses configured by networkd.
This is partial fix for #2228 and #2977, #3204.
bridge-test: netdev ready
docker0: Gained IPv6LL
wlan0: Gained IPv6LL
eth0: Gained IPv6LL
Enumeration completed
bridge-test: netdev exists, using existing without changing its
parameters
vboxnet0: IPv6 enabled for interface: Success
lo: Configured
docker0: Could not drop address: No such process
vboxnet0: Gained carrier
wlan0: Could not drop address: No such process
eth0: Could not drop address: No such process
eth0: Could not drop address: No such process
eth0: Could not drop address: No such process
vboxnet0: Gained IPv6LL
vboxnet0: Could not set NDisc route or address: Invalid argument
vboxnet0: Failed
[New Thread 0x7ffff6505700 (LWP 1111)]
[Thread 0x7ffff6505700 (LWP 1111) exited]
Assertion 'link->state == LINK_STATE_SETTING_ROUTES' failed at
src/network/networkd-link.c:672, function link_enter_configured().
Aborting.
Program received signal SIGABRT, Aborted.
0x00007ffff6dc6a98 in raise () from /lib64/libc.so.6
Missing separate debuginfos, use: dnf debuginfo-install
iptables-1.4.21-15.fc23.x86_64 libattr-2.4.47-14.fc23.x86_64
libidn-1.32-1.fc23.x86_64 pcre-8.38-7.fc23.x86_64
Debugging
(gdb) bt
"link->state == LINK_STATE_SETTING_ROUTES", file=0x5555556a34c8
"src/network/networkd-link.c", line=672,
func=0x5555556a56d0 <__PRETTY_FUNCTION__.14850>
"link_enter_configured") at src/basic/log.c:788
src/network/networkd-link.c:672
src/network/networkd-link.c:720
flags=0 '\000', scope=0 '\000', cinfo=0x7fffffffe020) at
src/network/networkd-address.c:344
(rtnl=0x5555556eded0, message=0x55555570ff20, userdata=0x5555556ec590)
at src/network/networkd-manager.c:604
m=0x55555570ff20) at src/libsystemd/sd-netlink/sd-netlink.c:365
at src/libsystemd/sd-netlink/sd-netlink.c:395
ret=0x0) at src/libsystemd/sd-netlink/sd-netlink.c:429
revents=1, userdata=0x5555556eded0) at
src/libsystemd/sd-netlink/sd-netlink.c:723
src/libsystemd/sd-event/sd-event.c:2268
src/libsystemd/sd-event/sd-event.c:2629
timeout=18446744073709551615) at src/libsystemd/sd-event/sd-event.c:2688
bus=0x5555556eeba0, name=0x55555568a2f5 "org.freedesktop.network1",
timeout=30000000,
check_idle=0x55555556adb6 <manager_check_idle>,
userdata=0x5555556ec590) at src/shared/bus-util.c:134
src/network/networkd-manager.c:1130
src/network/networkd.c:127
(gdb) f 3
src/network/networkd-link.c:672
672 assert(link->state == LINK_STATE_SETTING_ROUTES);
(gdb) p link->state
$1 = LINK_STATE_FAILED
We should not be in this state .
even if vboxnet0 failed we went into this state.
vboxnet0: Could not set NDisc route or address: Invalid argument
vboxnet0: Failed
Add an option to disable appending DHCP option 3 (Router) to the DHCP
OFFER and ACK packets.
This commit adds the boolean option EmitRouter= for the [DHCPServer]
section in .network files.
Rationale: On embedded devices, it is very useful to have a DHCP server
running on an USB OTG ethernet gadget interface to avoid manual setup on
the client PCs, but it should only serve IP addresses, no route(r)s.
Otherwise, Windows clients experience network connectivity issues, due
to them using the address set in DHCP option 3 as default gateway.
Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com>
This allows selecting the propagation level of emitted LLDP packets
(specifically: the destination MAC address of the packets). This is useful
because it allows generating LLDP packets that optionally cross certain types
of bridges.
See 802.11ab-2009, Table 7-1 for details.
Separate fields are replaced with a struct.
Second second duid type field is removed. The first field was used to carry
the result of DUIDType= configuration, and the second was either a copy of
this, or contained the type extracted from DuidRawData. The semantics are changed
so that the type specified in DUIDType is always used. DUIDRawData= no longer
overrides the type setting.
The networkd code is now more constrained than the sd-dhcp code:
DUIDRawData cannot have 0 length, length 0 is treated the same as unsetting.
Likewise, it is not possible to set a DUIDType=0. If it ever becomes necessary
to set type=0 or a zero-length duid, the code can be changed to support that.
Nevertheless, I think that's unlikely.
This addresses #3127 § 1 and 3.
v2:
- rename DUID.duid, DUID.duid_len to DUID.raw_data, DUID.raw_data_len
Header files were organized in a way where the includer would add various
typedefs used by the includee before including it, resulting in a tangled
web of dependencies between files.
Replace this with the following logic:
networkd.h
/ \
networkd-link.h \
networkd-ipv4ll.h--\__\
networkd-fdb.h \
networkd-network.h netword-netdev-*.h
networkd-route.h \
networkd-netdev.h
If a pointer to a structure defined in a different header file is needed,
use a typedef line instead of including the whole header.
If we not marking manager dirty when link is dirty then
the state file is not updated. This is a side effect of
issue 2850
setting CriticalConnection=yes
timesyncd NTP servers given by DHCP server are ignored.
IPv6 protocol requires a minimum MTU of 1280 bytes on the interface.
This fixes#3046.
Introduce helper link_ipv6_enabled() to figure out whether IPV6 is enabled.
Introduce network_has_static_ipv6_addresses() to find out if any static
ipv6 address configured.
If IPv6 is not configured on any interface that is SLAAC, DHCPv6 and static
IPv6 addresses not configured, then IPv6 will be automatically disabled for that
interface, that is we write "1" to /proc/sys/net/ipv6/conf//disable_ipv6.
lldp.h contains definitions of LLDP types, subtypes and capabilities which
should be exposed in public headers. Get rid of the file and move those
definitions to sd-lldp.h with the SD_ prefix.
Throughout the tree there's spurious use of spaces separating ++ and --
operators from their respective operands. Make ++ and -- operator
consistent with the majority of existing uses; discard the spaces.
Instead of just notifying about the fact that something changed in the
database, actually inform the callback what precisely changed. This is useful,
so that the LLDP tx logic can be put into "fast" mode as soon as a previously
unknown peer appears, as suggested by the LLDP spec.
Let's add some minimalistic LLDP sender support. The idea is that this is
either on or off, and all fields determined automatically rather than
configured explicitly.
Being on the link-layer LLDP is nothing we should turn on only when there's a
link beat. Instead, turn it on, whenever the iface is UP regardless if there's
a link beat or not. This closes the race between a link beat being available
and us subscribing to LLDP as a result.
This reworks the sd-lldp substantially, simplifying things on one hand, and
extending the logic a bit on the other.
Specifically:
- Besides the sd_lldp object only one other object is maintained now,
sd_lldp_neighbor. It's used both as storage for literal LLDP packets, and for
maintainging info about peers in the database. Separation between packet, TLV
and chassis data is not maintained anymore. This should be a major
simplification.
- The sd-lldp API has been extended so that a couple of per-neighbor fields may
be queried directly, without iterating through the object. Other fields that
may appear multiple times, OTOH have to be iterated through.
- The maximum number of entries in the neighbor database is now configurable
during runtime.
- The generation of callbacks from sd_lldp objects is more restricted:
callbacks are only invoked when actual data changed.
- The TTL information is now hooked with a timer event, so that removals from
the neighbor database due to TTLs now result in a callback event.
- Querying LLDP neighbor database will now return a strictly ordered array, to
guarantee stability.
- A "capabilities" mask may now be configured, that selects what type of LLDP
neighbor data is collected. This may be used to restrict collection of LLDP
info about routers instead of all neighbors. This is now exposed via
networkd's LLDP= setting.
- sd-lldp's API to serialize the collected data to text files has been removed.
Instead, there's now an API to extract the raw binary data from LLDP neighbor
objects, as well as one to convert this raw binary data back to an LLDP
neighbor object. networkd will save this raw binary data to /run now, and the
client side can simply parse the information.
- support for parsing the more exotic TLVs has been removed, since we are not
using that. Instead there are now APIs to extract the raw data from TLVs.
Given how easy it is to parse the TLVs clients should do so now directly
instead of relying on our APIs for that.
- A lot of the APIs that parse out LLDP strings have been simplified so that
they actually return strings, instead of char arrays with a length. To deal
with possibly dangerous characters the strings are escaped if needed.
- APIs to extract and format the chassis and port IDs as strings has been
added.
- lldp.h has been simplified a lot. The enums are anonymous now, since they
were never used as enums, but simply as constants. Most definitions we don't
actually use ourselves have eben removed.
Let's just keep the few parts we actually need of it in the main sd_lldp
object, so that we can simplify things quite a bit.
While we are at it, remove ifname and mac fields which we make no use of
whatsoever.
The call combines outputing a string with prefixing it with a space, optionally. This is useful to shorten the logic
for outputing lists of strings, that are space separated.
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.
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".
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.
GLIB has recently started to officially support the gcc cleanup
attribute in its public API, hence let's do the same for our APIs.
With this patch we'll define an xyz_unrefp() call for each public
xyz_unref() call, to make it easy to use inside a
__attribute__((cleanup())) expression. Then, all code is ported over to
make use of this.
The new calls are also documented in the man pages, with examples how to
use them (well, I only added docs where the _unref() call itself already
had docs, and the examples, only cover sd_bus_unrefp() and
sd_event_unrefp()).
This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we
tend to call our destructors these days.
Note that this defines no public macro that wraps gcc's attribute and
makes it easier to use. While I think it's our duty in the library to
make our stuff easy to use, I figure it's not our duty to make gcc's own
features easy to use on its own. Most likely, client code which wants to
make use of this should define its own:
#define _cleanup_(function) __attribute__((cleanup(function)))
Or similar, to make the gcc feature easier to use.
Making this logic public has the benefit that we can remove three header
files whose only purpose was to define these functions internally.
See #2008.
Commit 5e5b137a (networkd: link - drop foreign config when configuring
link) introduced a regression where addresses (including 127.0.0.1) are
removed from loopback device.
Do not handle loopback device when removing foreign configs.
Signed-off-by: Christian Hesse <mail@eworm.de>
