NetworkManager core is huge. We should try to split out
parts that are independent.
Platform code is already mostly independent. But due to having it
under "src/", there is no strict separation/layering which determines
the parts that can work independently. So, while the code is mostly
independent (in practice), that is not obvious from looking at the
source tree. It thus still contributes to cognitive load.
Add a shared library "shared/nm-platform", which should have no
dependencies on libnm-core or NetworkManager core.
In a first step, move the netlink code there. More should follow.
When building without "more-asserts" and LTO enabled, we can get
a warning about uninitalized "obj" variable:
src/platform/nm-linux-platform.c: In function 'ip_route_add':
src/platform/nm-platform.c:4761:24: warning: 'MEM[(struct NMPlatformIPRoute *)&obj + 24B].rt_source' may be used uninitialized in this function [-Wmaybe-uninitialized]
4761 | route->rt_source = nmp_utils_ip_config_source_round_trip_rtprot(route->rt_source);
| ^
src/platform/nm-platform.h:2139:25: warning: 'BIT_FIELD_REF <MEM[(const struct NMPlatformIPRoute *)&obj + 24B], 8, 72>' may be used uninitialized in this function [-Wmaybe-uninitialized]
2139 | return r->table_any ? 254u /* RT_TABLE_MAIN */
|
That is due to the "default" switch case which was unhandled
when building without more-asserts". Avoid that by reworking the
code.
Linux headers and some libc headers have overlapping defines
for network types and functions.
In the past years, glibc and linux headers were improved to cooperate
so you could include either one, in any order.
With musl and possibly some older glibc versions that doesn't work so
well.
Reorder and change includes to make it work better. Yes, this looks
pretty random and unmotivated. The includes are changed in order to
successfully build on various libc/kernel versions, with the goal
of not using #if.
Currently libnm headers include <linux/if_{ether,infiniband,vlan}.h>.
These are public headers, that means we drag in the linux header to all
users of <NetworkManager.h>.
Often the linux headers work badly together with certain headers from libc.
Depending on the libc version, you have to order linux headers in the right
order with respect to libc headers.
We should do better about libnm headers. As a first step, assume that
the linux headers don't get included by libnm, and explicitly include
them where they are needed.
These are unused now so remove them and revert most of
e0394689b3 which attempted to fix the same
issue of the platform wifi API not mapping well the nl80211 commands
resulting in redundant netlink commands being used.
In the wext driver there are still three individual getters for the
three values and nm_wifi_utils_get_station() uses either these or the
collective get_station method depending on the driver.
Merge nm_platform_wifi_get_bssid, nm_platform_wifi_get_quality,
nm_platform_wifi_get_rate into one utility, nm_platform_wifi_get_station
that uses the single NL80211_CMD_GET_STATION command dump when the
nl80211 driver is used. With wext each function mapped to one ioctl
while with nl80211 all three can be obtained with one netlink command.
The new function should use the minimum number of calls with either
driver.
Add a parameter to the 'link_add()' virtual function so that
the MTU will be configured (via netlink) by the kernel when
creating the link.
https://bugzilla.redhat.com/show_bug.cgi?id=1778590
Signed-off-by: Antonio Cardace <acardace@redhat.com>
When we (for example) receive a DHCP lease, we track the routes that
should be configured via NMPlatformIP[46]Route instances. Thus, this
structure does not only track the routes that are configured (and
cached in NMPlatform), but it is also used to track the routes that
we want to configure.
This is also the case with the "rt_source" field, which represents the
NMIPConfigSource enum for routes that we want to configure, but
for routes in the cache it corresponds to rtm_protocol.
Note that NMDhcpClient creates NMIP4Config instances, which tracks the
routes as NMPlatformIP4Route instances. Previously, NMDhcpClient didn't
have any way to leave the table/metric undecided, but this information
isn't part of the DHCP lease tself. Instead, NMDevice knows the table/metric
to use. This has various problems:
- NMDhcpClient needs to know the table/metric, for no other purpose
than to set the value when creating the NMIP4Config instance for the
lease. We first pass the information down, only so that it can be
returned with the lease information.
- during reapply or when connectivity check changes, the effectively
used table/metric can change. Previously, we would have to
re-generate the NMIP4Config instances.
Improve that by allowing to leave the table/metric undecided. Higher
layers can decide the effective metric to use.
Run:
./contrib/scripts/nm-code-format.sh -i
./contrib/scripts/nm-code-format.sh -i
Yes, it needs to run twice because the first run doesn't yet produce the
final result.
Signed-off-by: Antonio Cardace <acardace@redhat.com>
The kernel of Ubuntu 16.04 doesn't support IFLA_BR_VLAN_STATS_ENABLED.
If we want to run on such old kernels (which we probably do), we need to
detect that, and act accordingly.
Older kernels may not support or send all bridge options in the netlink
message. In case the parameter is missing, set the default value.
Note that there may be future cases where we need to encode whether
the option is present or not. Currently we don't express that.
Support the creation of parameterless 'prio' qdiscs. The kernel needs
a TCA_OPTIONS attribute initialized with default values. We currently
don't support modifying the qdisc parameters.
When searching an element that is lower than the first list element (for
example RTNL type "batadv"), imax will be -1 after the last iteration.
Use int instead of unsigned to make the termination condition imin > imax
work in this case. This fixes NetworkManager crashing due to an
out-of-bounds array access whenever interfaces of such types exist.
Fixes: 19ad044359 ('platform: use binary search to lookup NMLinkType for rtnl_type')
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/515
Add nm_utils_invoke_on_timeout() beside nm_utils_invoke_on_idle().
They are fundamentally similar, except one schedules an idle handler
and the other a timeout.
Also, use the current g_main_context_get_thread_default() as context
instead of the singleton instance. That is a change in behavior, but
the only caller of nm_utils_invoke_on_idle() is the daemon, which
doesn't use different main contexts. Anyway, to avoid anybody being
tripped up by this also change the order of arguments. It anyway
seems nicer to first pass the cancellable, and the callback and user
data as last arguments. It's more in line with glib's asynchronous
methods.
Also, in the unlikely case that the cancellable is already cancelled
from the start, always schedule an idle action to complete fast.
(cherry picked from commit cd5157a0c3)
g_clear_pointer() would always cast the destroy notify function
pointer to GDestroyNotify. That means, it lost some type safety, like
GPtrArray *ptr_arr = ...
g_clear_pointer (&ptr_arr, g_array_unref);
Since glib 2.58 ([1]), g_clear_pointer() is also more type safe. But
this is not used by NetworkManager, because we don't set
GLIB_VERSION_MIN_REQUIRED to 2.58.
[1] f9a9902aac
We have nm_clear_pointer() to avoid this issue for a long time (pre
1.12.0). Possibly we should redefine in our source tree g_clear_pointer()
as nm_clear_pointer(). However, I don't like to patch glib functions
with our own variant. Arguably, we do patch g_clear_error() in
such a manner. But there the point is to make the function inlinable.
Also, nm_clear_pointer() returns a boolean that indicates whether
anything was cleared. That is sometimes useful. I think we should
just consistently use nm_clear_pointer() instead, which does always
the preferable thing.
Replace:
sed 's/\<g_clear_pointer *(\([^;]*\), *\([a-z_A-Z0-9]\+\) *)/nm_clear_pointer (\1, \2)/g' $(git grep -l g_clear_pointer) -i
Several macros are used to define function. They had a "_STATIC" variant,
to define the function as static.
I think those macros should not try to abstract entirely what they do.
They should not accept the function scope as argument (or have two
variants per scope). This also because it might make sense to add
additional __attribute__(()) to the function. That only works, if
the macro does not pretend to *not* define a plain function.
Instead, embrace what the function does and let the users place the
function scope as they see fit.
This also follows what is already done with
static NM_CACHED_QUARK_FCN ("autoconnect-root", autoconnect_root_quark)
- track the broadcast address in NMPlatformIP4Address. For addresses
that we receive from kernel and that we cache in NMPlatform, this
allows us to show the additional information. For example, we
can see it in debug logging.
- when setting the address, we still mostly generate our default
broadcast address. This is done in the only relevant caller
nm_platform_ip4_address_sync(). Basically, we merely moved setting
the broadcast address to the caller.
That is, because no callers explicitly set the "use_ip4_broadcast_address"
flag (yet). However, in the future some caller might want to set an explicit
broadcast address.
In practice, we currently don't support configuring special broadcast
addresses in NetworkManager. Instead, we always add the default one with
"address|~netmask" (for plen < 31).
Note that a main point of IFA_BROADCAST is to add a broadcast route to
the local table. Also note that kernel anyway will add such a
"address|~netmask" route, that is regardless whether IFA_BROADCAST is
set or not. Hence, setting it or not makes very little difference for
normal broadcast addresses -- because kernel tends to add this route either
way. It would make a difference if NetworkManager configured an unusual
IFA_BROADCAST address or an address for prefixes >= 31 (in which cases
kernel wouldn't add them automatically). But we don't do that at the
moment.
So, while what NM does has little effect in practice, it still seems
more correct to add the broadcast address, only so that you see it in
`ip addr show`.
