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Filter out everything except UDP packets destined for the DHCP client port,
this should avoid the vast majority of spurious wakeups.
Filter based on [0], with permission.
Possible improvemnts: also check for the DHCP magic cookie to drop invalid
packets. Check for our xid to filter out packets destined for other clients.
[0]: <https://github.com/ambrop72/badvpn/blob/master/dhcpclient/BDHCPClient.c#L57>
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It seems to be a clang-analyzer problem since it don't behave like
clang-compiler regarding -std={c99,gnu99}
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Passing the protocol to socket() is redundant as it will be specified again in
bind(). Dropping the redundancy reduces the cost of bind() from ~30ms to ~0ms.
For details see [0].
networkd in a container (i.e., with next to no network latency) can now
negotiate a DHCP lease in 0.7 - 5 ms.
Thanks to Kay for help with debugging and to Daniel Borkmann for the pointer
to fix the problem.
[0]: <https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=902fefb82ef72a50c78cb4a20cc954b037a98d1c>
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This makes updating link status on netdev links work again.
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Free networks before links (the reverse of creation order).
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Also fix type parameter passed to new0
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When receiving lots of packets that are not meant for us, we waste a relatively large amount
of cpu time computing their checksums before discarding them. Move the checksum calculation last
so we never compute it for packets which would otherwise be discarded.
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Do not try to parse ICMP packets
[tomegun: slightly tweaked debug message]
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Reported by Thomas Hindoe Paaboel Andersen <phomes@gmail.com>
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We will easily get these when running on newer kernels. However, we can safely ignore them as we
anyway don't know what to do with them.
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Use a static table with all the typing information, rather than repeated
switch statements. This should make it a lot simpler to add new types.
We need to keep all the type info to be able to create containers
without exposing their implementation details to the users of the library.
As a freebee we verify the types of appended/read attributes.
The API is extended to nicely deal with unions of container types.
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The object is not currently used, so just drop the refenence. If/when we end up
using the object in the future, we must make sure to deal with possible mutual
references between rtnl busses and their queued messages; as is done in sd-bus.
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This reverts commit 8741f2defaf26aafe5ee0fd29954cfdf84ee519c: 'Add virtio-blk support to path_id' and
commit e3d563346c4237af23335cc6904e0662efdf62ad: 'udev: net_id - handle virtio buses'.
Distros may want to take note of this, as it changes behavior.
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<kay> ssuominen: and drop --no-as-needed from the linkcheck?
<kay> ssuominen: i expect it all triggers without the gc-sections thing alone
<ssuominen> if the intention is to make it strict as possible,
to catch undefined references caused by missing -lfoo in linker line, then
LDFLAGS="-Wl,-fuse-ld=gold -Wl,--as-needed -Wl,--no-gc-sections"
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Before:
$ systemd-analyze --user
Startup finished in 2.810s (firmware) + 48ms (loader) + 122ms (userspace) = 122ms
After:
$ systemd-analyze --user
Startup finished in 122ms (userspace) = 122ms
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/run/user/$UID/
$ ./test-cgroup-mask
...
rmdir("/run/user/2702/systemd/generator") = 0
open("/run/user/2702/systemd/generator.late", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_NOFOLLOW|O_NOATIME|O_CLOEXEC) = 5
fstat(5, {st_mode=S_IFDIR|0755, st_size=3200, ...}) = 0
fcntl(5, F_GETFL) = 0x78800 (flags O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_NOFOLLOW|O_NOATIME)
fcntl(5, F_SETFD, FD_CLOEXEC) = 0
getdents(5, /* 160 entries */, 32768) = 10072
unlinkat(5, "org.gnome.Weather.Application.busname", 0) = 0
unlinkat(5, "dbus-org.gnome.Weather.Application.service", 0) = 0
...
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loginctl, hostnamectl, localectl, machinectl
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Added support for tunneling netlink attrributes (ipip, gre, sit).
These works with kernel module ipip, gre and sit . The test cases are
moved to a separate file and manual test as well because they require
respective kernel modules as well.
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Currently we only support containers in RTM_*LINK messages.
Reported-by: "Thomas H.P. Andersen <phomes@gmail.com>"
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Based on a similar patch by Lukáš Nykrýn.
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