- tcp/scheme/tcp.rs: write_buf now returns the actual bytes from
send_slice() instead of buf.len(). Fixes TCP silent data truncation
when the send buffer cannot accept the full request.
- netstack/scheme/ip.rs: fpath() uses .expect() with a message in place
of .unwrap() for clearer diagnostics on buffer write failure.
- dhcpd/main.rs: parse the first non-flag positional argument as the
interface name. Previously dhcpd was hardcoded to 'eth0', which broke
when netctl spawned dhcpd with a different iface name.
- drivers/common/dma.rs: introduce Dma::sync_for_cpu() and
sync_for_device() that issue acquire/release fences. Provides a
portable API for DMA-buffer ordering without a hard dependency on
architecture-specific memory barriers.
- drivers/net/virtio-netd/scheme.rs: call sync_for_cpu() before reading
the VirtHeader in try_recv and sync_for_device() before queueing the
TX chain. Eliminates the risk of reading partially-written DMA
contents on architectures where the device and CPU do not share a
coherent cache.
UDP connect() to 255.255.255.255:67 sets the socket's source-filter to
broadcast peers only. The DHCP server (e.g. QEMU SLIRP at 10.0.2.2)
responds from its own IP, which the filter rejects. The OFFER never
arrives at recv(), the 8-second read timeout expires, dhcpd gives up,
and the system reaches login with no IP.
Per-packet send_to() with no source-filter restores the canonical
four-message handshake. Applied at all four broadcast points:
DISCOVER, REQUEST, RENEW, REBIND.
Keep the legacy send_dhcp() helper around for any future caller
that wants the kernel-default destination semantics (currently unused;
the new send_dhcp_to is the path all broadcast traffic takes).
Verified host build clean (7 pre-existing warnings unrelated to this
change; target build requires the cookbook toolchain and is exercised
in the canonical build pipeline).
driver-manager attaches NIC drivers asynchronously, so on a fresh boot the
network.* scheme does not exist yet when smolnetd/dhcpd run (both gated only on
the driver-manager service having *started*). smolnetd scanned /scheme once,
found nothing, and exited -> /scheme/netcfg never came up -> dhcpd/netctl failed
with "Can't open /scheme/netcfg/ifaces/eth0/mac" and DHCP timed out.
- smolnetd: poll (bounded 20s) for a network.* adapter to appear before giving
up; oneshot_async so this never blocks boot. Give-up log now distinguishes
genuinely-NIC-less from a NIC-present-but-driver-failed (stale driver) case.
- dhcpd: wait (bounded 20s) for /scheme/netcfg/ifaces/eth0/mac to appear before
attempting DHCP, instead of one-shot "Can't open"; exit clean if no NIC.
- init: add condition_path_exists so optional-daemon units (dbus, seatd,
thermald, evdevd) are silently skipped when their binary is absent in a
minimal image, instead of emitting [FAILED] 'No such file or directory' on
the bare target. Boot-critical units omit the field and still hard-fail.
- ahcid: an empty ATAPI/optical drive (QEMU's default DVD-ROM, most bare-metal
optical bays) failed READ CAPACITY and logged 4 ERROR lines every boot;
register it with a zero block count as a normal no-media state and drop the
HBA register dump to debug level.
- netstack: a machine with no NIC (bare, or an unsupported NIC) logged an ERROR
and exited non-zero; treat 'no network adapter' as a normal idle state
(info + clean exit).
- dhcpd: cut the socket timeout 30s -> 8s so the network stage fails fast when
no DHCP server answers instead of stalling boot.
This way all components necessary to get a working network connection
are in the base repo. In the future this might help with mounting a
network disk from the initfs. The netutils recipe doesn't get included
in the initfs.
Red Bear OS