[libc] Allow assertions to be globally enabled or disabled
Assertions are enabled for objects built with any debug level
(including an explicit debug level of zero). It is sometimes useful
to be able to enable assertions across all objects; this currently
requires manually hacking include/assert.h.
Allow assertions to be globally enabled by adding ASSERT=1 to the
build command line. For example:
make bin/8086100e.mrom ASSERT=1
Similarly, allow assertions to be globally disabled by adding ASSERT=0
to the build command line. If no ASSERT=... is specified on the
build command line, then only objects mentioned in DEBUG=... will have
assertions enabled (as is currently the case).
Note than globally enabling assertions imposes a relatively heavy
runtime penalty, primarily due to the various sanity checks performed
by list_add(), list_for_each_entry(), etc.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[debug] Allow debug messages to be initially disabled at runtime
Extend the DEBUG=... syntax to allow debug messages to be compiled in
but disabled by default. For example:
make bin/undionly.kpxe DEBUG=netdevice:3:1
would compile in the messages as for DEBUG=netdevice:3, but would set
the debug level mask so that only the DEBUG=netdevice:1 messages would
be displayed.
This allows for external code to selectively enable the additional
debug messages at runtime, without being overwhelmed by unwanted
initial noise. For example, a developer of a new protocol may want to
temporarily enable tracing of all packets received: this can be done
by building with DEBUG=netdevice:3:1 and using
// temporarily enable per-packet messages
DBG_ENABLE_OBJECT ( netdevice, DBGLVL_EXTRA );
...
// disable per-packet messages
DBG_DISABLE_OBJECT ( netdevice, DBGLVL_EXTRA );
Note that unlike the usual DBG_ENABLE() and DBG_DISABLE() macros,
DBG_ENABLE_OBJECT() and DBG_DISABLE_OBJECT() will not be removed via
dead code elimination if debugging is disabled in the specified
object. In particular, this means that using either of these macros
will always result in a symbol reference to the specified object.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[debug] Allow per-object runtime enabling/disabling of debug messages
The DBG_ENABLE() and DBG_DISABLE() macros currently affect the debug
level of all objects that were built with debugging enabled. This is
undesirable, since it is common to use different debug levels in each
object.
Make the debug level mask a per-object variable. DBG_ENABLE() and
DBG_DISABLE() now control only the debug level for the containing
object (which is consistent with the intended usage across the
existing codebase). DBG_ENABLE_OBJECT() and DBG_DISABLE_OBJECT() may
be used to control the debug level for a specified object. For
example:
// Enable DBG() messages from tcpip.c
DBG_ENABLE_OBJECT ( tcpip, DBGLVL_LOG );
Note that the existence of debug messages continues to be gated by the
DEBUG=... list specified on the build command line. If an object was
built without the relevant debug level, then DBG_ENABLE_OBJECT() will
have no effect on that object at runtime (other than to explicitly
drag in the object via a symbol reference).
Signed-off-by: Michael Brown <mcb30@ipxe.org>
A redirection failure is fatal, but provides no opportunity for the
caller of xfer_[v]redirect() to report the failure since the interface
will already have been disconnected. Fix by sending intf_close() from
within the default xfer_vredirect() handler.
Debugged-by: Robin Smidsrød <robin@smidsrod.no>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[dhcp] Automatically generate vendor class identifier string
The vendor class identifier strings in DHCP_ARCH_VENDOR_CLASS_ID are
out of sync with the (correct) client architecture values in
DHCP_ARCH_CLIENT_ARCHITECTURE.
Fix by removing all definitions of DHCP_ARCH_VENDOR_CLASS_ID, and
instead generating the vendor class identifier string automatically
based on DHCP_ARCH_CLIENT_ARCHITECTURE and DHCP_ARCH_CLIENT_NDI.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[dhcpv6] Include vendor class identifier option in DHCPv6 requests
RFC3315 defines DHCPv6 option 16 (vendor class identifier) but does
not define any direct relationship with the roughly equivalent DHCPv4
option 60.
The PXE specification predates IPv6, and the UEFI specification is
expectedly vague on the subject. Examination of the reference EDK2
codebase suggests that the DHCPv6 vendor class identifier will be
formatted in accordance with RFC3315, using a single vendor-class-data
item in which the opaque-data field is the string as would appear in
DHCPv4 option 60.
RFC3315 requires the vendor class identifier to specify an IANA
enterprise number, as a way of disambiguating the vendor-class-data
namespace. The EDK2 code uses the value 343, described as:
// TODO: IANA TBD: temporarily using Intel's
Since this "TODO" has been present since at least 2010, it is probably
safe to assume that it has now become a de facto standard.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[dhcpv6] Include RFC5970 client architecture options in DHCPv6 requests
RFC5970 defines DHCPv6 options 61 (client system architecture type)
and 62 (client network interface identifier), with contents equivalent
to DHCPv4 options 93 and 94 respectively.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[dhcp] Allow for variable encapsulation of architecture-specific options
DHCPv4 and DHCPv6 share some values in common for the architecture-
specific options (such as the client system architecture type), but
use different encapsulations: DHCPv4 has a single byte for the option
length while DHCPv6 has a 16-bit field for the option length.
Move the containing DHCP_OPTION() and related wrappers from the
individual dhcp_arch.h files to dhcp.c, thus allowing for the
architecture-specific values to be reused in dhcpv6.c.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[pxe] Disable interrupts on the PIC before starting NBP
Some BIOSes (observed with an HP Gen9) seem to spuriously enable
interrupts at the PIC. This causes problems with NBPs such as GRUB
which use the UNDI API (thereby enabling interrupts on the NIC)
without first hooking an interrupt service routine. In this
situation, the interrupt will end up being handled by the default BIOS
ISR, which will typically just send an EOI and return. Since nothing
in this handler causes the NIC to deassert the interrupt, this will
result in an interrupt storm.
Entertainingly, some BIOSes are immune to this problem because the
default ISR sends the EOI only to the slave PIC; this effectively
disables the interrupt.
Work around this problem by disabling the interrupt on the PIC before
invoking the PXE NBP. An NBP that expects to make use of interrupts
will need to be configuring the PIC anyway, so it is probably safe to
assume that it will explicitly reenable the interrupt.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[bios] Do not enable interrupts when printing to the console
There seems to be no reason for the sti/cli pair used around each call
to INT 10. Remove these instructions, so that printing debug messages
from within an ISR does not temporarily reenable interrupts.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[efi] Fix uninitialised data in HII IFR structures
The HII IFR structures are allocated via realloc() rather than
zalloc(), and so are not automatically zeroed. This results in the
presence of uninitialised and invalid data, causing crashes elsewhere
in the UEFI firmware.
Fix by explicitly zeroing the newly allocated portion of any IFR
structure in efi_ifr_op().
Debugged-by: Laszlo Ersek <lersek@redhat.com>
Debugged-by: Gary Lin <glin@suse.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[efi] Do not copy garbage bytes into SNP device path MAC address
The SNP device path includes the network device's MAC address within
the MAC_ADDR_DEVICE_PATH.MacAddress field. We check that the
link-layer address will fit within this field, and then perform the
copy using the length of the destination buffer.
At 32 bytes, the MacAddress field is actually larger than the current
maximum iPXE link-layer address. The copy therefore overflows the
source buffer, resulting in trailing garbage bytes being appended to
the device path's MacAddress. This is invisible in debug messages,
since the DevicePathToText protocol will render only the length
implied by the interface type.
Fix by copying only the actual length of the link-layer address (which
we have already verified will not overflow the destination buffer).
Debugged-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
iPXE debug logging doesn't support %u. This commit replaces it with
%d in virtio-pci debug format strings.
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Some of the regions may end up being unmapped, either because they are
optional or because the attempt to map them has failed. Region types
starting at 0 didn't make it easy to test for this condition.
This commit bumps all valid region types up by 1 with 0 having the
implicit 'unmapped' meaning.
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[time] Allow system clock to be adjusted at runtime
Provide a mechanism to allow an arbitrary adjustment to be applied to
all subsequent calls to time().
Note that the underlying clock source (e.g. the RTC clock) will not be
changed; only the time as reported within iPXE will be affected.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
ARM64 has a weaker memory order model than x86. The missing memory
barrier caused phy initialization notification to be delayed beyond
the link-wait timeout (15 secs).
Signed-off-by: Leendert van Doorn <leendert@paramecium.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[tcp] Send TCP keepalives on idle established connections
In some circumstances, intermediate devices may lose state in a way
that temporarily prevents the successful delivery of packets from a
TCP peer. For example, a firewall may drop a NAT forwarding table
entry.
Since iPXE spends most of its time downloading files (and hence purely
receiving data, sending only TCP ACKs), this can easily happen in a
situation in which there is no reason for iPXE's TCP stack to generate
any retransmissions. The temporary loss of connectivity can therefore
effectively become permanent.
Work around this problem by sending TCP keepalives after a period of
inactivity on an established connection.
TCP keepalives usually send a single garbage byte in sequence number
space that has already been ACKed by the peer. Since we do not need
to elicit a response from the peer, we instead send pure ACKs (with no
garbage data) in order to keep the transmit code path simple.
Originally-implemented-by: Ladi Prosek <lprosek@redhat.com>
Debugged-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[pci] Support systems with multiple PCI root bridges
Extend the 16-bit PCI bus:dev.fn address to a 32-bit seg:bus:dev.fn
address, assuming a segment value of zero in contexts where multiple
segments are unsupported by the underlying data structures (e.g. in
the iBFT or BOFM tables).
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[libc] Always use a non-zero seed for the (non-crypto) RNG
The non-cryptographic RNG implemented by random() has the property
that a seed value of zero will result in a generated sequence of
all-zero values. This situation can arise if currticks() returns zero
at start of day.
Work around this problem by falling back to a fixed non-zero seed if
necessary.
This has no effect on the separate DRBG used by cryptographic code.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Fix build error with perl >= 5.23.2:
Can't redeclare "my" in "my" at ./util/parserom.pl line 160
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Robin Smidsrød <robin@smidsrod.no>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[efi] Expose DHCP packets via the Apple NetBoot protocol
Mac OS X uses non-standard EFI protocols to obtain the DHCP packets
from the UEFI firmware.
Originally-implemented-by: Michael Kuron <m.kuron@gmx.de>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[dhcp] Fix definitions for x86_64 and EFI BC client architectures
There has been a longstanding disagreement between RFC4578 and the
IANA "Processor Architecture Types" registry. RFC4578 section 2.1
defines type 7 as "EFI BC" and type 9 as "EFI x86-64"; the IANA
registry quotes RFC4578 as its source but has these values erroneously
swapped. The EDK2 codebase uses the IANA values.
As of March 2016, RFC4578 has been modified by an errata to match the
values as recorded in the IANA registry.
Fix our definitions to match the consensus values.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Some UEFI keyboard drivers are blissfully unaware of the existence of
either Ctrl key, and will report "Ctrl-<key>" as just "<key>". This
breaks substantial portions of the iPXE user interface.
Work around these broken UEFI drivers by allowing "ESC <key>" to be
used as a substitute for "Ctrl-<key>".
Tested-by: Dreamcat4 <dreamcat4@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Some HTTP/2 servers send the header "Connection: upgrade, close". This
currently causes iPXE to fail due to the unrecognised "upgrade" token.
Fix by ignoring any unrecognised tokens in the "Connection" header.
Reported-by: Ján ONDREJ (SAL) <ondrejj@salstar.sk>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This backport is from linux kernel upstream commit 83d6f1f ("ath9k:
fix buffer overrun for ar9287").
Signed-off-by: Christian Hesse <mail@eworm.de>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
The raw cycle counter at PMCCNTR_EL0 works in qemu but seems to always
read as zero on physical hardware (tested on Juno r1 and Cavium
ThunderX), even after ensuring that PMCR_EL0.E and PMCNTENSET_EL0.C
are both enabled.
Use CNTVCT_EL0 instead; this seems to count at a lower resolution
(tens of CPU cycles), but is usable for profiling.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[efi] Guard against GetStatus() failing to return a NULL TX buffer
The UEFI specification requires the EFI_SIMPLE_NETWORK_PROTOCOL
GetStatus() method to set TxBuf to NULL if there are no transmit
buffers to recycle.
Some implementations (observed with Lan9118Dxe in EDK2) fill in TxBuf
only when there is a transmit buffer to recycle, which leads to large
numbers of "spurious TX completion" errors.
Work around this problem by initialising TxBuf to NULL before calling
the GetStatus() method.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown