[settings] Make "netX" settings block function as a symbolic link
Add a facility for settings blocks to act as symbolic links to other
settings blocks, and reimplement the "netX" virtual settings block
using this facility.
The primary advantage of this approach is that unscoped settings such
as ${mac} and ${filename} will now reflect the settings obtained from
the most recently opened network device: in most cases, this will mean
the settings obtained from the most recent DHCP attempt. This should
improve conformance to the principle of least astonishment.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[settings] Expose PCI configuration space via settings mechanism
Allow values to be read from PCI configuration space using the syntax
${pci/<busdevfn>.<offset>.<length>}
where <busdevfn> is the bus:dev.fn address of the PCI device
(expressed as a single integer, as returned by ${net0/busloc}),
<offset> is the offset within PCI configuration space, and <length> is
the length within PCI configuration space.
Values are returned in reverse byte order, since PCI configuration
space is little-endian by definition.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Move VMWARE_SETTINGS build configuration option from config/sideband.h
to a new config/settings.h.
Existing instances of config/local/sideband.h will not be affected,
since config.c still #includes config/sideband.h.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Allow network device's "busloc" setting to be formatted as a PCI
bus:dev.fn address using e.g. ${net0/busloc:busdevfn}.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Use hex_decode() to parse "hex" and "hexhyp" settings. Note that this
parser is stricter than the old parser; it now requires exactly two
hex digits for each byte. (The old parser was based upon strtoul()
and so would allow leading whitespace and a leading plus or minus
sign.)
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[base16] Generalise base16_decode() to hex_decode()
Provide a generic hex_decode() routine which can be shared between the
Base16 code and the "hex" and "hexhyp" settings parsers.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[tcp] Do not send RST for unrecognised connections
On large networks with substantial numbers of monitoring agents,
unwanted TCP connection attempts may end up flooding iPXE's ARP cache.
Fix by silently dropping packets received for unrecognised TCP
connections. This should not cause problems, since many firewalls
will also silently drop any such packets.
Reported-by: Jarrod Johnson <jarrod.b.johnson@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[autoboot] Use next-server from filename's settings block
Locate the settings block containing the filename, and search only
that settings block for the next-server address. This avoids problems
caused by misconfigured DHCP servers which provide a next-server
address (often defaulting to the DHCP server's own IP address) even
when not providing a filename.
Originally-implemented-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
gcc 4.8 and 4.9 fail to compile pxe_call.c with the error "bp cannot
be used in asm here". Other points in the codebase which use "ebp" in
the asm clobber list do not seem to be affected.
Unfortunately gcc provides no way to specify %ebp as an output
register, so we cannot use this as a workaround. The only viable
solution is to explicitly push/pop %ebp within the asm itself. This
is ugly for two reasons: firstly, it may be unnecessary; secondly, it
may cause gcc to generate invalid %esp-relative addresses if the asm
happens to use memory operands. This specific block of asm uses no
memory operands and so will not generate invalid code.
Reported-by: Daniel P. Berrange <berrange@redhat.com>
Reported-by: Christian Hesse <list@eworm.de>
Originally-fixed-by: Christian Hesse <list@eworm.de>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Some versions of Linux apparently complain if initrds are not aligned
to a page boundary. Fix by changing INITRD_ALIGN from 4 bytes to 4096
bytes.
The amount of padding at the end of each initrd will now often be
sufficient to allow the cpio header to be prepended without crossing
an alignment boundary. The final location of the initrd may therefore
end up being slightly higher than the post-shuffle location.
bzimage_load_initrd() must therefore now copy the initrd body prior to
copying the cpio header, otherwise the start of the initrd body may be
overwritten by the cpio header. (Note that the guarantee that an
initrd will never need to overwrite an initrd at a higher location
still holds, since the overall length of each initrd cannot decrease
as a result of adding a cpio header.)
Reported-by: Dave Hansen <dave@sr71.net>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
RFC2560 mandates that a valid OCSP response will contain exactly one
relevant certificate. However, some OCSP responders include
extraneous certificates. iPXE currently assumes that the first
certificate in the OCSP response is the relevant certificate; OCSP
checks will therefore fail if the responder includes the extraneous
certificates before the relevant certificate.
Fix by using the responder ID to identify the relevant certificate.
Reported-by: Christian Stroehmeier <stroemi@mail.uni-paderborn.de>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
realtek_destroy_ring() currently does nothing if the card is operating
in legacy (pre-RTL8139C+) mode. In particular, the producer and
consumer counters are incorrectly left holding their current values.
Virtual hardware (e.g. the emulated RTL8139 in qemu and similar VMs)
is tolerant of this behaviour, but real hardware will fail to transmit
if the descriptors are not used in the correct order.
Fix by resetting the producer and consumer counters in
realtek_destroy_ring() even if the card is operating in legacy mode.
Reported-by: Gelip <mrgelip@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[romprefix] Fix incorrect pointer offset in undiloader.S
Commit 2422647 ("[prefix] Allow prefix to specify an arbitrary maximum
address for relocation") introduced a regression into the UNDI ROM
loader by preserving an extra register on the stack without modifying
the %sp-relative addresses used in the routine.
Fix by correcting the %sp-relative addresses to allow for the extra
preserved variable.
Signed-off-by: Frediano Ziglio <frediano.ziglio@citrix.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
When the $(eval) function is available (in GNU make >= 3.80), we can
evaluate many of the dynamically-generated Makefile rules directly.
This avoids generating a few hundred Makefile fragments in the
filesystem, and so speeds up the build process.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[crypto] Report meaningful error when certificate chain validation fails
If a certificate chain contains no certificate which can be validated
as a standalone certificate (i.e. contains no trusted root
certificates or previously-validated certificates) then iPXE will
currently return a fixed error EACCES_UNTRUSTED. This masks the
actual errors obtained when attempting to validate each certificate as
a standalone certificate, and so makes troubleshooting difficult for
the end user.
Fix by instead returning the error obtained when attempting to
validate the final certificate in the chain as a standalone
certificate. This error is most likely (though not guaranteed) to
represent the "real" problem.
Reported-by: Sven Dreyer <sven@dreyer-net.de>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[smbios] Allow access to multiple instances of SMBIOS structures
Extend the syntax for numerical SMBIOS settings from
smbios/<type>.<offset>.<length>
to
smbios/[<instance>.]<type>.<offset>.<length>
Where SMBIOS provides multiple structures with the same <type>, this
extended syntax allows for access to structures other than the first.
If <instance> is omitted then it will default to zero, giving access
to the first instance (and so matching existing behaviour).
The 16-bit SMBIOS handle (which is an alternative way to disambiguate
multiple instances of the same type of structure) can be accessed, if
required, using
smbios/<instance>.<type>.2.2:uint16
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[smbios] Allow access to unreferenced SMBIOS strings
iPXE allows access to general SMBIOS settings using the syntax:
smbios/<type>.<offset>.<length>
This provides access to any fixed-offset field within an SMBIOS
structure. This syntax is currently overloaded to interpret a zero
<length> as meaning that the byte at <offset> contains a string index;
this provides access to SMBIOS strings (which are not located at fixed
offsets).
The "OEM Strings" SMBIOS structure contains strings which are not
referenced by any fixed string index field within the structure. iPXE
currently provides no way to access these strings.
Fix by overloading the syntax for numerical SMBIOS settings to
interpret an <offset> of zero as implying that <length> contains a
literal string index. The OEM Strings can then be accessed using:
smbios/11.0.1
smbios/11.0.2
smbios/11.0.3
...
The actual byte at offset zero will always contain the structure type,
which is already known since it must be specified in order to access
the structure. There is thus no plausible existing use case for an
offset of zero; overloading the syntax in this way should therefore
not break compatibility with any existing scripts.
The corner case where both <offset> and <length> are zero is undefined
(and, for now, will simply return a "not found" error).
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Create an explicit concept of "settings scope" and eliminate the magic
values used for numerical setting tags.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[netdevice] Add netdev_tx_defer() to allow drivers to defer transmissions
Devices with small transmit descriptor rings may temporarily run out
of space. Provide netdev_tx_defer() to allow drivers to defer packets
for retransmission as soon as a descriptor becomes available.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[realtek] Ensure EEPROM writes reach chip before starting udelay()
On some systems, it appears to be possible for writes to the EEPROM
registers to be delayed for long enough that the EEPROM's setup and
hold times are violated, resulting in invalid data being read from the
EEPROM.
Fix by inserting a PCI read cycle immediately after writes to
RTL_9346CR, to ensure that the write has completed before starting the
udelay() used to time the SPI bus transitions.
Reported-by: Gelip <mrgelip@gmail.com>
Tested-by: Gelip <mrgelip@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[romprefix] Report failure cause when unable to open payload
Report the cause of the failure when we are unable to open the .mrom
payload. There are two possible failure cases:
- Unable to find a suitable memory BAR to borrow (e.g. if the NIC
doesn't have a memory BAR that is at least as large as the
expansion ROM BAR, or if the memory BAR has been assigned a 64-bit
address which won't fit into the 32-bit expansion ROM BAR). This
will be reported as "BABABABA".
- Unable to find correct ROM image within the BAR. This will be
reported as the address (within the borrowed BAR) at which we first
fail to find a valid 55AA signature.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[realtek] Allow reaction time between writing RTL_CAPR and reading RTL_CR
Some older RTL8139 chips seem to not immediately update the
RTL_CR.BUFE bit in response to a write to RTL_CAPR. This results in
iPXE seeing a spurious zero-length received packet, and thereafter
being out of sync with the hardware's RX ring offset.
Fix by inserting an extra PCI read cycle after writing to RTL_CAPR, to
give the chip time to react before we next read RTL_CR.
Reported-by: Gelip <mrgelip@gmail.com>
Tested-by: Gelip <mrgelip@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Some onboard RTL8169 NICs seem to leave the EEPROM pins disconnected.
The existing is_valid_ether_addr() test will not necessarily catch
this, since it expects a missing EEPROM to show up as a MAC address of
00:00:00:00:00:00 or ff:ff:ff:ff:ff:ff. When the EEPROM pins are
floating the MAC address may read as e.g. 00:00:00:00:0f:00, which
will not be detected as invalid.
Check the ID word in the first two bytes of the EEPROM (which should
have the value 0x8129 for all RTL8139 and RTL8169 chips), and use this
to determine whether or not an EEPROM is present.
Reported-by: Carl Karsten <carl@nextdayvideo.com>
Tested-by: Carl Karsten <carl@nextdayvideo.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
sparse does not understand -fshort-wchar. Default to using uint16_t
as a wchar_t if not explicitly specified by the compiler, to avoid
large numbers of spurious warnings from sparse.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Linker table entries must be non-static in order to avoid being
completely optimised away by some versions of gcc. Use -Wno-decl to
prevent sparse from warning about these, since the alternative would
be to litter the code with otherwise unnecessary "extern"
declarations.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
sparse does not define __WCHAR_TYPE__ or __WINT_TYPE__. We already
define __WCHAR_TYPE__ if the compiler does not do so; do the same for
__WINT_TYPE__.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
sparse seems to have problems finding compiler.h when specified as
"-include compiler.h"; one possible explanation is that it ignores the
include path. Fix by using "-include include/compiler.h".
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[netdevice] Use link-layer address as part of RNG seed
iPXE currently seeds the random number generator using the system
timer tick count. When large numbers of machines are booted
simultaneously, multiple machines may end up choosing the same DHCP
transaction ID (XID) value; this can cause problems.
Fix by using the least significant (and hence most variable) bits of
each network device's link-layer address to perturb the random number
generator. This introduces some per-machine unique data into the
random number generator's seed, and so reduces the chances of DHCP XID
collisions.
This does not affect the ANS X9.82-compatible random bit generator
used by TLS and other cryptography code, which uses an entirely
separate source of entropy.
Originally-implemented-by: Bernhard Kohl <bernhard.kohl@nsn.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Add disambiguated errors for LoadImage() and StartImage(), primarily
to demonstrate how to use __einfo_uniqify() and __einfo_platformify()
in the context of EFI platform errors.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Exploit the redefinition of iPXE error codes to include a "platform
error code" to allow for meaningful conversion of EFI_STATUS values to
iPXE errors and vice versa.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[libc] Redefine low 8 bits of error code as "platform error code"
The low 8 bits of an iPXE error code are currently defined as the
closest equivalent PXE error code. Generalise this scheme to
platforms other than PC-BIOS by extending this definition to "closest
equivalent platform error code". This allows for the possibility of
returning meaningful errors via EFI APIs.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Michael Brown