The 0.13 release line contains critical TCP correctness fixes that
backport into Red Bear:
- RFC 6298 retransmit backoff (was using a non-standard exponential
backoff with a different initial value)
- zero-window probes (the previous code did not implement them, so
connections stalled when the receiver advertised a 0 window)
- FIN retransmit in CLOSING state (the prior code only retransmitted
FIN from FIN-WAIT-1 and never recovered from a lost second FIN)
- SYN crash on unspecified address (the kernel would panic on a
SYN with src == 0.0.0.0; the 0.13.1 fix returns a RST)
- IPv6 SLAAC support on the wire when the upstream proto-ipv6
feature is enabled (Red Bear already enables proto-ipv6)
The code in scheme/ip.rs is already in 0.13.1 form (RawSocket::new
takes IpVersion directly, not Option<IpVersion>) and scheme/icmp.rs
already uses the 0.13.1 ip_protocol() signature, so the migration is
intentionally restricted to the version field. The Cargo.lock will be
regenerated by the canonical build (cookbook uses --locked, so the
next build-redbear.sh run will refresh the lockfile after the
workspace can resolve smoltcp 0.13.1).
- 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.
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.
- smolnetd: an empty ip_router (DHCP-managed or deliberately network-less like
the bare target) is a valid 'no default gateway' state, not a malformed config
-> no warning.
- router: a limited/directed IPv4 broadcast (DHCP DISCOVER to 255.255.255.255
before any lease/route exists) legitimately has no routing-table entry; don't
warn 'No route found' for broadcast destinations.
- e1000d: add the 82574L (0x10d3, QEMU '-device e1000e') to the E1000 match
list; it keeps the legacy descriptor/register interface this driver uses.
I219 is intentionally excluded (integrated MDIO PHY, different init).
- 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.
On success, the number of bytes written should be returned.
Previously `buf.len()` was always returned. The function `send_slice`
> ... returns the amount of octets actually enqueued, which is limited
> by the amount of free space in the transmit buffer; down to zero.
"down to zero" is okay as that is checked by `can_send`.
Signed-off-by: Anhad Singh <andypython@protonmail.com>
We did not update the relibc version needed for redox-rt or generic-rt.
Additionally, base @6b9593946 was missing an updated callsite for
`can_recv()`.
Red Bear OS