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Multipath TCP (MPTCP), standardized in RFC8684 [1], is a TCP extension
that enables a TCP connection to use different paths. It allows a device
to make use of multiple interfaces at once to send and receive TCP
packets over a single MPTCP connection. MPTCP can aggregate the
bandwidth of multiple interfaces or prefer the one with the lowest
latency, it also allows a fail-over if one path is down, and the traffic
is seamlessly re-injected on other paths.
To benefit from MPTCP, both the client and the server have to support
it. Multipath TCP is a backward-compatible TCP extension that is enabled
by default on recent Linux distributions (Debian, Ubuntu, Redhat, ...).
Multipath TCP is included in the Linux kernel since version 5.6 [2]. To
use it on Linux, an application must explicitly enable it when creating
the socket:
int sd = socket(AF_INET(6), SOCK_STREAM, IPPROTO_MPTCP);
No need to change anything else in the application.
This patch allows MPTCP protocol in the Socket unit configuration. So
now, a <unit>.socket can contain this to use MPTCP instead of TCP:
[Socket]
SocketProtocol=mptcp
MPTCP support has been allowed similarly to what has been already done
to allow SCTP: just one line in core/socket.c, a very simple addition
thanks to the flexible architecture already in place.
On top of that, IPPROTO_MPTCP has also been added in the list of allowed
protocols in two other places, and in the doc. It has also been added to
the missing_network.h file, for systems with an old libc -- note that it
was also required to include <netinet/in.h> in this file to avoid
redefinition errors.
Link: https://www.rfc-editor.org/rfc/rfc8684.html [1]
Link: https://www.mptcp.dev [2]
Set the $REMOTE_ADDR environment variable for AF_UNIX socket connections
when using per-connection socket activation (Accept=yes). $REMOTE_ADDR
will now contain the remote socket's file system path (starting with a
slash "/") or its address in the abstract namespace (starting with an
at symbol "@").
This information is essential for identifying the remote peer in AF_UNIX
socket connections, but it's not easy to obtain in a shell script for
example without pulling in a ton of additional tools. By setting
$REMOTE_ADDR, we make this information readily available to the
activated service.
I do not think this is necessary, but all other places in
libsystemd-network we clear buffer before receive. Without this,
Coverity warns about use-of-uninitialized-values.
Let's silence Coverity.
Closes CID#1469721.
Let's follow the conventions set by "Registry of Reserved TPM 2.0 Handles
and Localities" and only allocate nvindex currently not assigned to any
vendor.
For details see:
https://trustedcomputinggroup.org/resource/registry/
Section 2.2
Since we document /usr/local/lib/systemd/ and other paths for various things,
add notes that this is not supported if /usr/local is a separate partition. In
systemd.unit, I tried to add the footnote in the table where
/usr/local/lib/systemd/ is listed, but that get's rendered as '[sup]a[/sup]'
with a mangled footnote at the bottom of the table :( .
Also, split paragraphs in one place where the subject changes without any
transition.
Follow-up for 02f35b1c90.
Replaces https://github.com/systemd/systemd/pull/33231.
Follow-up for 1d617b35fe.
Should fix https://github.com/systemd/systemd/issues/33269.
From the logs in the bug:
Jun 10 22:55:37 systemd-logind[909]: The system will suspend now!
Jun 10 22:55:37 ModemManager[996]: <msg> [sleep-monitor-systemd] system is about to suspend
...
Jun 10 22:55:48 systemd-sleep[422408]: Failed to freeze unit 'user.slice': Connection timed out
Jun 10 22:55:48 systemd-sleep[422408]: Performing sleep operation 'suspend'...
The delay is ~11 s, consistent with the patch that set the timeout to 10 s.
Looks like this is not enough. It's the freeze operation that fails, but
thawing might be slow too, so just bump the timeout again.
Currently the check also succeeds if the input path starts with a dot, whereas
we only want it to succeed for "." and "./". Tighten the check and add a test.
Enabling this service by default means every CI image without a
regular user now gets stuck on first boot due to the password prompt
from systemd-homed-firstboot.service. Let's not enable the service
by default but instead require users to enable it explicitly if they
want its behavior.
Fixes#33249
systemd-nspawn sets up /dev/console as a symlink to a pty, so let's
make sure we follow the symlink when trying to lock /dev/console so
we don't fail with ELOOP.
Follow-up for 28459ba1f4
The pty path returned by OpenMachinePTY() cannot be opened from outside
the machine, hence let's use the plain Standard{Input,Output,Error}=tty
in such a case. This means if --machine= is specified, #32916 would occur.
A comprehensive fix requires a new dbus method in machined, which shall
be material for v257.
See also: https://github.com/systemd/systemd/pull/33216#discussion_r1628020429
Replaces #33216
Co-authored-by: Mike Yuan <me@yhndnzj.com>
This reverts commit 0f5a529217.
As discussed in https://github.com/systemd/systemd/issues/33104,
that patch caused problems in Debian which has a udev drop-in with
[Match]
Path=*-usb-*
[Link]
NamePolicy=mac
The rename fails:
eth0: Policy *mac* yields "enx00*".
eth0: /usr/lib/udev/rules.d/80-net-setup-link.rules:11 NAME 'enx00*'
eth0: /usr/lib/udev/rules.d/99-systemd.rules:69 RUN '/usr/lib/systemd/systemd-sysctl --prefix=/net/ipv4/conf/$name --prefix=/net/ipv4/neigh/$
eth0: sd-device: Created database file '/run/udev/data/n9' for '/devices/pci0000:00/0000:00:1c.4/0000:02:00.0/0000:03:01.0/0000:05:00.0/0000:
eth0: Failed to rename network interface 9 from 'eth0' to 'enx00*': File exists
eth0: sd-device: Created database file '/run/udev/data/n9' for '/devices/pci0000:00/0000:00:1c.4/0000:02:00.0/0000:03:01.0/0000:05:00.0/0000:
eth0: Failed to process device, ignoring: File exists
Two network interfaces have the same MAC and it's not marked NET_ADDR_STOLEN.
In this case the conflict is very visible because it causes the rename to fail,
but it would also occur in other cases, for alternative names.
A patch has been submitted for r8152 to properly set NET_ADDR_STOLEN:
https://lore.kernel.org/linux-usb/20240605153340.25694-1-gmazyland@gmail.com/T/#u
Let's revert this now to avoid a regression. We can try again after the kernel
issue is resolved.
Closes https://github.com/systemd/systemd/issues/33104.
