On CentOS 7, gcc.x86_64 0:4.8.5-44.el7 fails compilation:
In file included from ./src/libnm-glib-aux/nm-default-glib.h:69:0,
from ./src/libnm-glib-aux/nm-default-glib-i18n-lib.h:13,
from src/libnm-core-aux-extern/nm-libnm-core-aux.c:6:
./src/libnm-glib-aux/nm-shared-utils.h:1051:1: error: '__thread' before 'extern'
_nm_thread_local extern char _nm_utils_to_string_buffer[2096];
^
Fixes: fb94903444 ('glib-aux: mark _nm_utils_to_string_buffer at thread-local')
It's great to have functions that cannot fail, because it allows to
skip any error handling.
_set_stable_privacy() as it was could not fail, so the only reason why
nm_utils_ipv6_addr_set_stable_privacy() could fail is because the DAD
counter exhausted.
Also, it will be useful to have a function that does not do the counter
check, where the caller wants to handle that differently.
Rename some functions, and make the core nm_utils_ipv6_addr_set_stable_privacy()
not failable.
While NMUtilsIPv6IfaceId is only 8 bytes large, it seems unidiomatic to
pass the plain struct around.
With a "const NMUtilsIPv6IfaceId *" argument it is more clear what the
meaning of this is.
Change to use pointers.
The preference for IPv6 routes was added in kernel v4.1,
22 June 2015. It is even in latest RHEL7 kernels.
Drop trying to be compatible with such old kernels.
We use extended IFA_FLAGS for IFA_F_MANAGETEMPADDR (IPv6) and
IFA_F_NOPREFIXROUTE (IPv4 and IPv6).
These flags for IPv4 were added to kernel 3.14, 30 March, 2014.
The flag for IPv4 was added to kernel 4.4, 11 January 2016.
Even latest RHEL-7 kernels have backport for IFA_F_NOPREFIXROUTE
for IPv4 (rh#1221311).
Drop this. The backward compatibility code paths are likely broken
anyway, and add considerable complexity.
This is supported since kernel 3.17, dated 5 October, 2014. Drop the backward
compatibility for that.
It's very hard to sensibly support a mode where we set the interface up,
but prevent kernel from enabling IPv6. We would hack around that by disabling
IPv6 altogether.
But these code paths are not tested and likely make no sense. And it's hard
to implement a sensible behavior in this case anyway.
The term "user_ipv6ll" is confusing and not something somebody familiar
with kernel or `ip -d link` would understand.
Also, it maps a boolean to addr-gen-mode "none" or "eui64", although
there are 2 more address generation modes in kernel.
Don't abstract the underlying API, and name things as they are in
kernel.
NMDevice's act_stage3_ip_config_start() has an out parameter,
so that an NMIPConfig object can be returned. That is (luckily)
not used much, and it's fundamentally flawed. We want that
the start method becomes simpler and idempotent. That argument
is problematic there.
Instead, of the result is already ready, postpone the activation
and process the return on an idle handler.
Why not use nm_device_set_dev2_ip_config() to pass the configuration?
Good question, who knows? For now, just mimic the previous behavior.
Usually the IP configuration would be announced late, so we can just
do that artificially by scheduling an idle action.
The idea, that callers to nm_modem_stage3_ip4_config_start() pass
a NMDeviceClass, which then might invoke a virtual function on
the class is really bad.
nm_modem_stage3_ip4_config_start() should indicate what the caller
should do.
The main problem is, that act_stage3_ip_config_start() is not supposed
to be called by anybody except NMDevice. It's an internal hook, not for
NMModem's concern.
We possibly should refactor our code to no use _nm_utils_to_string_buffer,
but instead always provide a suitable (stack allocated?) buffer.
Until that is done, make the buffer thread local so that it avoids
the most obvious problem (of resulting in non-thread-safe code).
It can be convenient to track a NMPObject in form of their down-cast
pointers. When doing that, it's useful to have clear/ref-set helpers
that operate on such pointers and up-cast first.
This approach does not seem to work with clang 3.4 (rhel-7). Instead,
make sure we actually use the symbol in NetworkManager so that it gets
preserved for the OVS device plugin.
This reverts commit 684f2acffe.
The two nm-sudo helper functions are only used by the OVS device plugin,
but they are part of NetworkManager core binary.
This is done commonly, where the NetworkManager binary has symbols that
are used by the plugins. But in this case, NetworkManager itself doesn't
use the symbols. That will case the linker to drop them.
A previous solution for that was commit 684f2acffe ('build: add way to
keep unused symbols when linking NetworkManager'), but that doesn't seem
to work with clang 3.4 (rhel-7).
Instead, actually use the symbol so that it cannot be dropped.
The formatting produced by clang-format depends on the version of the
tool. The version that we use is the one of the current Fedora release.
Fedora 34 recently updated clang (and clang-tools-extra) from version
12.0.0 to 12.0.1. This brings some changes.
Update the formatting.
This happens if there are duplicate BSSIDs for a profile in
"/var/lib/NetworkManager/seen-bssid" file.
#0 c_list_unlink_stale (what=0x555555bc8768) at ./src/c-list/src/c-list.h:160
#1 _seen_bssid_entry_free (data=0x555555bc8750) at src/core/settings/nm-settings-connection.c:98
#2 0x00007ffff77e834a in g_hash_table_insert_node
(hash_table=hash_table@entry=0x555555afa9e0 = {...}, node_index=node_index@entry=6, key_hash=key_hash@entry=967604099, new_key=new_key@entry=0x555555bc8750, new_value=new_value@entry=0x555555bc8750, keep_new_key=keep_new_key@entry=0, reusing_key=0) at ../glib/ghash.c:1352
#3 0x00007ffff77e88f0 in g_hash_table_insert_internal (keep_new_key=0, value=0x555555bc8750, key=0x555555bc8750, hash_table=0x555555afa9e0 = {...}) at ../glib/ghash.c:1600
#4 g_hash_table_insert (hash_table=0x555555afa9e0 = {...}, key=key@entry=0x555555bc8750, value=value@entry=0x555555bc8750) at ../glib/ghash.c:1629
#5 0x000055555586c5e1 in _nm_settings_connection_register_kf_dbs (self=self@entry=0x555555bbf5a0, kf_db_timestamps=<optimized out>, kf_db_seen_bssids=<optimized out>)
at src/core/settings/nm-settings-connection.c:2382
#6 0x00005555555b7e19 in _connection_changed_update
(self=self@entry=0x555555b1d0c0, sett_conn_entry=sett_conn_entry@entry=0x555555b60390, connection=0x555555b953f0, sett_flags=sett_flags@entry=NM_SETTINGS_CONNECTION_INT_FLAGS_NONE, sett_mask=sett_mask@entry=_NM_SETTINGS_CONNECTION_INT_FLAGS_PERSISTENT_MASK, update_reason=update_reason@entry=(NM_SETTINGS_CONNECTION_UPDATE_REASON_RESET_SYSTEM_SECRETS | NM_SETTINGS_CONNECTION_UPDATE_REASON_RESET_AGENT_SECRETS | NM_SETTINGS_CONNECTION_UPDATE_REASON_UPDATE_NON_SECRET)) at src/core/settings/nm-settings.c:1080
#7 0x00005555555b8b5a in _connection_changed_process_one
(self=self@entry=0x555555b1d0c0, sett_conn_entry=0x555555b60390, allow_add_to_no_auto_default=allow_add_to_no_auto_default@entry=0, sett_flags=sett_flags@entry=NM_SETTINGS_CONNECTION_INT_FLAGS_NONE, sett_mask=_NM_SETTINGS_CONNECTION_INT_FLAGS_PERSISTENT_MASK,
sett_mask@entry=NM_SETTINGS_CONNECTION_INT_FLAGS_NONE, override_sett_flags=override_sett_flags@entry=1, update_reason=(NM_SETTINGS_CONNECTION_UPDATE_REASON_RESET_SYSTEM_SECRETS | NM_SETTINGS_CONNECTION_UPDATE_REASON_RESET_AGENT_SECRETS | NM_SETTINGS_CONNECTION_UPDATE_REASON_UPDATE_NON_SECRET)) at src/core/settings/nm-settings.c:1304
#8 0x00005555555b8c5e in _connection_changed_process_all_dirty
(self=self@entry=0x555555b1d0c0, allow_add_to_no_auto_default=allow_add_to_no_auto_default@entry=0, sett_flags=sett_flags@entry=NM_SETTINGS_CONNECTION_INT_FLAGS_NONE, sett_mask=sett_mask@entry=NM_SETTINGS_CONNECTION_INT_FLAGS_NONE, override_sett_flags=override_sett_flags@entry=1, update_reason=update_reason@entry=(NM_SETTINGS_CONNECTION_UPDATE_REASON_RESET_SYSTEM_SECRETS | NM_SETTINGS_CONNECTION_UPDATE_REASON_RESET_AGENT_SECRETS | NM_SETTINGS_CONNECTION_UPDATE_REASON_UPDATE_NON_SECRET)) at src/core/settings/nm-settings.c:1325
#9 0x00005555555b8d40 in _plugin_connections_reload (self=self@entry=0x555555b1d0c0) at src/core/settings/nm-settings.c:1448
#10 0x00005555555bddb5 in nm_settings_start (self=0x555555b1d0c0, error=error@entry=0x7fffffffe278) at src/core/settings/nm-settings.c:3892
#11 0x000055555560013d in nm_manager_start (self=self@entry=0x555555b19060, error=error@entry=0x7fffffffe278) at src/core/nm-manager.c:6961
#12 0x0000555555594b27 in main (argc=<optimized out>, argv=<optimized out>) at src/core/main.c:496
Fixes: 8278719840 ('settings: limit number of seen-bssids and preserve order')
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues/787
With LTO builds, it assumes that the assertion-failed code-paths
can be reached, and thus a warning gets emitted:
In function nmp_cache_lookup,
inlined from nm_platform_lookup at src/libnm-platform/nm-platform.c:3377:12,
inlined from nm_platform_lookup_object at ./src/libnm-platform/nmp-object.h:975:12:
src/libnm-platform/nmp-object.h:742:46: error: lookup.cache_id_type may be used uninitialized [-Werror=maybe-uninitialized]
742 | return nmp_cache_lookup_all(cache, lookup->cache_id_type, &lookup->selector_obj);
| ^
./src/libnm-platform/nmp-object.h: In function nm_platform_lookup_object:
./src/libnm-platform/nmp-object.h:972:15: note: lookup declared here
972 | NMPLookup lookup;
| ^
"test-ifcfg-rh.c" is huge, with lots of repeated, verbose code.
Refactor the code by using some helper macros so that the line noise
is smaller and we can easier see what is happening.
- use nmtst_connection_assert_setting() instead of
nm_connection_get_setting*(), followed by an assertion.
- use _nm_connection_new_setting() instead of multiple lines to
create and add the setting.
- drop all explicit unref/free and use cleanup macro.
- unify some variable names.
- drop some useless comments. In particular, comments were used as
visual separators because the code is verbose and hard to read. The
solution to verbose and hard to read is not more code/comments, the
solution is clearer, conciser code.
printf() is not guaranteed to properly handle NULL string,
although glibc will print "(null)".
Avoid that by not printing the currently set value. The error
message is anyway already very long.
These type-specific getters are not very useful. _nm_connection_get_setting() is
better because the setting type is a parameter so they can be used more generically.
Have less code and use generic helpers.
- the writer/reader should be lossless. There is a difference
on whether a NMConnection has/hasn't a NMSettingBondPort instance.
If we thus have a NMSettingBondPort, we must always encode that
in the ifcfg file, by writing BOND_PORT_QUEUE_ID=0. Otherwise,
the reader will not create the setting.
- it's really not the task of the writer to validate what it writes.
All these write_bridge_port_setting() really should not fail. They
should serialize the setting as good as they can. And if they cannot,
it's probably a bug in the writer (by not being lossless).
write_bond_port_setting() did not ever fail. It should not ever fail.
So don't let the function return a potential failure, and don't
handle a failure that should never happen.
- use svGetValue() instead of svGetValueStr(). The difference is that
svGetValueStr() coerces "" to NULL. "" is not a valid value, but we
want to parse the value and print an warning message about it. Also,
the presence of the variable determines whether we add the bond-port
setting or not.
- don't use nm_clear_g_free(). @value_to_free is gs_free, it will be
cleared automatically.
- use g_object_set() instead of nm_g_object_set_property_uint(). The
latter is our own implementation that does error checking (e.g., that
the value is in range (0..2^16-1). But we already ensured that to
be the case. So just call g_object_set(), it cannot fail and if it
would, we want the assertion failure that it would cause.
- queue_id should be a "guint". It is always true on Linux/glib that
sizeof(guint) >= sizeof(guint32), the opposite theoretically might not
be true.
But later we use the variable in the variadic function g_object_set(),
where it should be guint.
- the errno from _nm_utils_ascii_str_to_uint64() isn't very useful for
logging. It's either ERANGE or EINVAL, and logging the numeric values
of these error codes isn't gonna help the user. We could stringify
with nm_strerror_native(errno), but that message is also not very
useful. Just say that the string is not a number.
Use sizeof(queue_id_str), so we don't rely on _MAX_QUEUE_ID_STR_LEN
being the correct size for the string.
Also, let's create an excessively large buffer. True, the previous size
should have always be enough, so in practice there is no difference.
But what if it were not? Should we try to handle an error? How? Just asserting
or report a failure? But we don't because the error cannot happen, can't
it?
Don't answer any of these questions, but by making the string buffer
larger, it's even less likely that these questions become relevant.
If for some reason nm_device_get_iface() gives a long string, then we
don't care and let kernel reject the invalid interface name.
While both functions are basically the same, the majority of the time
we use g_snprintf(). There is no strong reason to prefer one or the
other, but let's keep using one variant.
