Some protocols (such as ARP) may modify the received packet and re-use
the same I/O buffer for transmission of a reply. The SMSC95XX
transmit header is larger than the receive header: the re-used I/O
buffer therefore does not have sufficient headroom for the transmit
header, and the ARP reply will therefore fail to be transmitted. This
is essentially the same problem as in commit 2e72d10 ("[ncm] Reserve
headroom in received packets").
Fix by reserving sufficient space at the start of each received packet
to allow for the difference between the lengths of the transmit and
receive headers.
This problem is not caught by the current driver development test
suite (documented at http://ipxe.org/dev/driver), since even the large
file transfer tests tend to completely sufficiently quickly that there
is no need for the server to ever send an ARP request. The failure
shows up only when using a very slow protocol such as RFC7440-enhanced
TFTP (as used by Windows Deployment Services).
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The LED pins are configured by default as GPIO inputs. While it is
conceivable that a board might actually use these pins as GPIOs, no
such board is known to exist.
The Linux smsc95xx driver configures these pins unconditionally as LED
outputs. Assume that it is safe to do likewise.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Expose the network interface name (e.g. "net0") as a setting. This
allows a script to obtain the name of the most recently opened network
interface via ${netX/ifname}.
Signed-off-by: Andrew Widdersheim <amwiddersheim@gmail.com>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[build] Add named configuration for public cloud environments
Add a named CONFIG=cloud configuration, which enables console types
useful for obtaining output from virtual machines in public clouds
such as AWS EC2.
An image suitable for use in AWS EC2 can be built using
make bin/ipxe.usb CONFIG=cloud EMBED=config/cloud/aws.ipxe
The embedded script will direct iPXE to download and execute the EC2
"user-data" file, which is always available to an EC2 VM via the URI
http://169.254.169.254/latest/user-data (regardless of the VPC
networking settings). The boot can therefore be controlled by
modifying the per-instance user data, without having to modify the
boot disk image.
Console output can be obtained via syslog (with a syslog server
configured in the user-data script), via the AWS "System Log" (after
the instance has been stopped), or as a last resort from the log
partition on the boot disk.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The three nominally-disambiguated ENOTSUP errors accidentally all used
the same error disambiguator, rendering them identical. Fix by
changing all three values. We avoid reusing the 0x01 disambiguator
value, since that remains ambiguous in older binaries.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Some BIOS console redirection capabilities do not work well with the
colourised debug messages used by iPXE. We already allow the range of
colours to be controlled via the DBGCOL=... build parameter. Extend
this syntax to allow DBGCOL=0 to be used to mean "disable colours".
Requested-by: Wissam Shoukair <wissams@mellanox.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Provide a debug function check_bios_interrupts() to look for changes
to the interrupt vector table. This can be useful when investigating
the behaviour (including crashes) of external PXE NBPs.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[tftp] Do not change current working URI when TFTP server is cleared
For historical reasons, iPXE sets the current working URI to the root
of the TFTP server whenever the TFTP server address is changed. This
was originally implemented in the hope of allowing a DHCP-provided
TFTP filename to be treated simply as a relative URI. This usage
turns out to be impractical since DHCP-provided TFTP filenames may
include characters which would have special significance to the URI
parser, and so the DHCP next-server+filename combination is now
handled by the dedicated pxe_uri() function instead.
The practice of setting the current working URI to the root of the
TFTP server is potentially helpful for interactive uses of iPXE,
allowing a user to type e.g.
iPXE> dhcp
Configuring (net0 52:54:00:12:34:56)... ok
iPXE> chain pxelinux.0
and have the URI "pxelinux.0" interpreted as being relative to the
root of the TFTP server provided via DHCP.
The current implementation of tftp_apply_settings() has an unintended
flaw. When the "dhcp" command is used to renew a DHCP lease (or to
pick up potentially modified DHCP options), the old settings block
will be unregistered before the new settings block is registered.
This causes tftp_apply_settings() to believe that the TFTP server has
been changed twice (to 0.0.0.0 and back again), and so the current
working URI will always be set to the root of the TFTP server, even if
the DHCP response provides exactly the same TFTP server as previously.
Fix by doing nothing in tftp_apply_settings() whenever there is no
TFTP server address.
Debugged-by: Andrew Widdersheim <awiddersheim@inetu.net>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[downloader] Update image URI in response to a redirection
Update the image's recorded URI when a download redirection occurs.
This ensures that URIs relative to a redirected download are resolved
correctly.
In particular, this allows for the use of relative URIs in scripts
that are themselves downloaded via a redirection, such as the HTTP 301
redirection used to fix up URIs pointing to directories but omitting
the trailing slash (e.g. "http://boot.ipxe.org/demo", which will be
redirected to "http://boot.ipxe.org/demo/").
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Resolve redirection URIs as being relative to the original HTTP
request URI, rather than treating them as being implicitly relative to
the current working URI.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[romprefix] Report an optimistic runtime size estimate
Commit 5de45cd ("[romprefix] Report a pessimistic runtime size
estimate") set the PCI3.0 "runtime size" field equal to the worst-case
runtime size, on the basis that there is no guarantee that PMM
allocation will succeed and hence no guarantee that we will be able to
shrink the ROM image.
On a PCI3.0 system where PMM allocation would succeed, this can cause
the BIOS to unnecessarily refuse to initialise the iPXE ROM due to a
perceived shortage of option ROM space.
Fix by reporting the best-case runtime size via the PCI header, and
checking that we have sufficient runtime space (if applicable). This
allows iPXE ROMs to initialise on PCI3.0 systems that might otherwise
fail due to a shortage of option ROM space.
This may cause iPXE ROMs to fail to initialise on PCI3.0 systems where
PMM is broken. (Pre-PCI3.0 systems are unaffected since there must
already have been sufficient option ROM space available for the
initialisation entry point to be called.)
On balance, it seems preferable to avoid breaking "good" systems
(PCI3.0 with working PMM) at the cost of potentially breaking "bad"
systems (PCI3.0 with broken PMM).
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[vmware] Expose GuestRPC mechanism in 64-bit builds
The GuestRPC mechanism (used for VMWARE_SETTINGS and CONSOLE_VMWARE)
does not use any real-mode code and so can be exposed in both 64-bit
and 32-bit builds.
Reported-by: Matthew Helton <mwhelton@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Allow the use of the iPXE DRBG implementation in BSD-licensed
projects.
Requested-by: Sean Davis <dive@hq.endersgame.net>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Allow the use of the iPXE DRBG implementation in BSD-licensed
projects.
Requested-by: Sean Davis <dive@hq.endersgame.net>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[smsc95xx] Allow for multiple methods for obtaining the MAC address
The SMSC95xx devices tend to be used in embedded systems with a
variety of ad-hoc mechanisms for storing the MAC address.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
When USB network card drivers are used, the BIOS' legacy USB
capability is necessarily disabled since there is no way to share the
host controller between the BIOS and iPXE.
Commit 3726722 ("[usb] Add basic support for USB keyboards") added
support allowing a USB keyboard to be used within iPXE. However,
external code such as a PXE NBP has no way to utilise this support,
and so a USB keyboard cannot be used to control a PXE NBP loaded from
a USB network card.
Add support for injecting keypresses from any iPXE console into the
BIOS keyboard buffer. This allows external code such as a PXE NBP to
function with a USB keyboard even after the BIOS' legacy USB
capability has been disabled.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[build] Allow extra objects to be included in an all-drivers build
The build system allows for additional drivers (or other objects) to
be specified using build targets such as
make bin/intel--realtek.usb
make bin/8086100e--8086100f.mrom
This currently fails if the base target is the "bin/ipxe.*" all-drivers
target, e.g.
make bin/ipxe--acm.usb
Fix the build target parsing logic to allow additional drivers (or
other objects) to be included on top of the base all-drivers target.
This can be used to include USB network card drivers, which are not
yet included by default in the all-drivers build.
Reported-by: Andrew Sloma <asloma@lenovo.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[xhci] Ensure that zero-length packets are not part of a TRB chain
Some xHCI controllers (such as qemu's emulated xHCI controller) do not
correctly handle zero-length packets that are part of a TRB chain.
The zero-length TRB ends up being squashed and does not result in a
zero-length packet as seen by the device.
Work around this problem by marking the zero-length packet as
belonging to a separate transfer descriptor.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[usb] Allow additional settling time for out-of-spec hubs
Some hubs (e.g. the Avocent Corp. Virtual Hub on a Lenovo x3550
Integrated Management Module) have been observed to require more than
the standard 200ms for ports to stabilise, with the result that
devices appear to disconnect and immediately reconnect during the
initial bus enumeration.
Work around this problem by allowing specific hubs an extra 500ms of
settling time.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[usb] Record USB device speed separately from current port speed
Record the speed of a USB device based on the port's speed at the time
that the device was enabled. This allows us to remember the device's
speed even after the device has been disconnected (and so the port's
current speed has changed).
In particular, this allows us to correctly identify the transaction
translator for a low-speed or full-speed device after the device has
been disconnected.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[usb] Use port->disconnected to check for disconnected devices
The usb_message() and usb_stream() functions currently check for
port->speed==USB_SPEED_NONE to determine whether or not a device has
been unplugged. This test will give a false negative result if a new
device has been plugged in before the hotplug mechanism has finished
handling the removal of the old device.
Fix by checking instead the port->disconnected flag, which is now
cleared only after completing the removal of the old device.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Provide BIT_QWORD_PTR() to allow for easy extraction of non-endian
fields (e.g. Infiniband GUIDs) without unnecessary byte swapping.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[smsc95xx] Add driver for SMSC/Microchip LAN95xx USB Ethernet NICs
Tested using QEMU and usbredir to expose the LAN9512 chip present on a
Raspberry Pi.
There is a known issue with the LAN9512: an extra two bytes are
appended to every transmitted packet. These two bytes comprise:
{ 0x00, 0x08 } if packet length == 0 (mod 8)
{ CRC[0], 0x00 } if packet length == 7 (mod 8)
{ CRC[0], CRC[1] } otherwise
The extra bytes are appended whether the Ethernet CRC is generated
manually or added automatically by the hardware. The issue occurs
with the Linux kernel driver as well as the iPXE driver. It appears
to be an undocumented hardware errata.
TCP/IP traffic is not affected, since the IP header length field
causes the extraneous bytes to be discarded by the receiver. However,
protocols that rely on the length of the Ethernet frame (such as FCoE
or iPXE's "lotest" protocol) will be unusable on this hardware.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
On some models (notably ICH), the PHY reset mechanism appears to be
broken. In particular, the PHY_CTRL register will be correctly loaded
from NVM but the values will not be propagated to the "OEM bits" PHY
register. This typically has the effect of dropping the link speed to
10Mbps.
Since the original version of this driver in commit 945e428 ("[intel]
Replace driver for Intel Gigabit NICs"), we have always worked around
this problem by skipping the PHY reset if the link is already up.
Enhance this workaround by explicitly checking for known-broken PCI
IDs.
Reported-by: Robin Smidsrød <robin@smidsrod.no>
Tested-by: Robin Smidsrød <robin@smidsrod.no>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[comboot] Reset console before starting COMBOOT executable
iPXE does not call shutdown() before invoking a COMBOOT executable,
since the executable is allowed to make API calls back into iPXE. If
a background picture is used, then the console will not be restored to
text mode before invoking the COMBOOT executable. This can cause
undefined behaviour.
Fix by adding an explicit call to console_reset() immediately before
invoking a COMBOOT or COM32 executable, analogous to the call made to
console_reset() immediately before invokving a PXE NBP.
Debugged-by: Andrew Widdersheim <awiddersheim@inetu.net>
Tested-by: Andrew Widdersheim <awiddersheim@inetu.net>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[dhcp] Limit maximum number of DHCP discovery deferrals
For switches which remain permanently in the non-forwarding state (or
which erroneously report a non-forwarding state), ensure that iPXE
will eventually give up waiting for the link to become unblocked.
Originally-fixed-by: Wissam Shoukair <wissams@mellanox.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
If we detect (via STP) that a switch port is in a non-forwarding
state, then the link is marked as being temporarily blocked and DHCP
discovery will be deferred until the link becomes unblocked.
The timer used to decide when to give up waiting for ProxyDHCPOFFERs
is currently based on the time that DHCP discovery was started, and
makes no allowances for any time spent waiting for the link to become
unblocked. Consequently, if STP is used then the timeout for
ProxyDHCPOFFERs becomes essentially zero.
Fix by resetting the recorded start time whenever DHCP discovery is
deferred due to a blocked link.
Debugged-by: Sebastian Roth <sebastian.roth@zoho.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[build] Generalise CONSOLE_VESAFB to CONSOLE_FRAMEBUFFER
The name "vesafb" is intrinsically specific to a BIOS environment.
Generalise the build configuration option CONSOLE_VESAFB to
CONSOLE_FRAMEBUFFER, in preparation for adding EFI framebuffer
support.
Existing configurations using CONSOLE_VESAFB will continue to work.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown