[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>
[tcp] Fix comment to match code behaviour

Reported-by: Thomas Miletich <thomas.miletich@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[test] Add self-tests for base16

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>
[settings] Use hex_decode() to parse hex settings

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>
[settings] Add "hexraw" setting type

Originally-implemented-by: Jeppe Toustrup <ipxe@tenzer.dk>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[netdevice] Add "bustype" and "busloc" settings

Signed-off-by: Michael Brown <mcb30@ipxe.org>
[settings] Add "busdevfn" setting type

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>
[linux] Add support for accessing PCI configuration space via /proc/bus/pci

Signed-off-by: Michael Brown <mcb30@ipxe.org>
[settings] Add config/settings.h

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>
[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>
[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>
[cmdline] Accept "netX" in iPXE commands

Allow any iPXE command expecting a network device name to accept
"netX" as a synonym for "most recently opened network device".

Signed-off-by: Michael Brown <mcb30@ipxe.org>
[settings] Add "version" builtin setting

Signed-off-by: Michael Brown <mcb30@ipxe.org>
[lotest] Include sequence number within loopback test packets

Include a sequence number as the first four bytes of the loopback test
packet payload.  When a content mismatch occurs, this gives some
information about the source of the mismatched packet.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
[rhine] Rewrite VIA Rhine driver

Replace the old via-rhine driver with a new version using the iPXE
API.

Includes fixes by Thomas Miletich for:

  - MMIO access
  - Link detection
  - RX completion in RX overflow case
  - Reset and EEPROM reloading
  - CRC stripping
  - Missing cpu_to_le32() calls
  - Missing memory barriers

Signed-off-by: Adrian Jamróz <adrian.jamroz@gmail.com>
Modified-by: Thomas Miletich <thomas.miletich@gmail.com>
Tested-by: Thomas Miletich <thomas.miletich@gmail.com>
Tested-by: Robin Smidsrød <robin@smidsrod.no>
Modified-by: Michael Brown <mcb30@ipxe.org>
Tested-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[intel] Incorporate ring producer and consumer counters in diagnostics

Signed-off-by: Michael Brown <mcb30@ipxe.org>
[linux] Add missing #include <stddef.h>

Signed-off-by: Marin Hannache <git@mareo.fr>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[legal] Add FILE_LICENCE for valgrind headers

Signed-off-by: Marin Hannache <git@mareo.fr>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[legal] Add FILE_LICENCE for core/errno.c

Signed-off-by: Marin Hannache <git@mareo.fr>
Signed-off-by: Michael Brown <mcb30@ipxe.org>