treewide: remove references to CREDITS ...

The CREDITS file was removed from barebox in 2015 by commit 6570288f2d97
("Remove the CREDITS file"). Remove references to it from several files.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: Allow hostnames for global.net.server ...

Additional to IPv4 addresses add support for global.net.server being a
hostname.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: dns: return error codes ...

The resolv() function used to return the IP address. When net_udp_new()
fails we return an error code though which the callers of resolv() take
as an IP address. This is wrong of course and we could return 0 in this
case. Instead we return an error code and pass the resolved IP as a
pointer which allows us to return proper error codes.

This patch also adds error messages and error returns to the various
callers of resolv() which used to just continue with a zero IP and
let the user figure out what went wrong.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: Do not route traffic to interfaces that are not up ...

In the case when:

  - Board has multiple network interfaces

  - Two ore more of those interfaces are statically configured to be
    on the same network

  - Only one of those interfaces is up and it is preceeded (as far as
    for_each_netdev is concerned) by interface in the same network
    that isn't

net_route() will choose "non-up" device as a route for traffic
resulting in no network connectivity. Change the routing logic to also
consider if interface is "up", so that only such interfaces would be
considered for sending network traffic out.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: use dev_warn() when no MAC address is set ...

When a SoC such as VF610 has no addresses programmed for both its
interfaces, the "No MAC address set" warning can be confusing:

    booting 'net'
    WARNING: net: warning: No MAC address set. Using random address a2:e8:be:79:72:01
    WARNING: net: warning: No MAC address set. Using random address aa:d5:d7:10:c0:42

This patch uses dev_warn() instead and removes the redundant "warning":

    booting 'net'
    WARNING: eth0: No MAC address set. Using random address a2:e8:be:79:72:01
    WARNING: eth1: No MAC address set. Using random address 4e:be:c4:bc:ce:36

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>

net: Pick network device based on IP settings ...

The IP/netmask/gateway settings contain all informations
needed to pick the correct network device. This patch
adds support for that and makes specifying the "current"
network interface using the ethact command unnecessary.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: dhcp: Allow to specify network device ...

Instead of allowing to DHCP only on the "current" network
device, allow to specify the desired network device. This
is a first step to get rid of the concept of a "current"
network device.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: allow udp connections on specified network device ...

This allows the DHCP code to configure specific network
devices so that DHCP no longer depends on any "current"
network device.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: Use a single gateway ...

There is not much point in having a network device specific
gateway. If barebox really is part of such a complicated network
in which it needs multiple gateways, then we probably need a
real routing table. Until this happens, a single gateway should
be enough.

This introduces global.net.gateway which holds the gateway ip. The
previously used device specific <ethx>.gateway variables still exist,
but are only aliases for the single gateway.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: dhcp: Do not overwrite serverip if it is valid ...

Some DHCP servers provide the wrong serverip in which case
it is desired to specify it manually and won't let the dhcp
command overwrite it.
This has previously been done by setting the serverip again
to the desired value after dhcp has been executed. With this
patch we do not overwrite it in the first place if it is valid
already. This is necessary when the serverip is not set via
/env/network/eth* but via nv.net.server.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: introduce global.net.server ...

The server to use is independent of the network device, there is
not much point to make the server specific to a network device.

This introduces global.net.server as the serverip which is
used as standard NFS/tftp server. The previously used eth
device specific parameters still exist, but are only aliases
for the global single variable.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: Add functions to get/set nameserver and domainname ...

It's more convenient to have getter/setter functions for
variables rather than using the detour around global vars
which use string matching and all kinds of overhead in the
background.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: Make domainname and nameserver globalvars ...

Register domainname and nameserver as globalvars rather than attaching
them to a dedicated net device. the global device already exists and
already contains much of the barebox configuration, so no need to add
an extra device for network config.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: Add and use IP_BROADCAST ...

Rather than using the hardcoded value 0xffffffff in several places
add a define for the broadcast IP.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: use pr_* functions for messages ...

Use pr_* functions in the networking code rather than printf() and
debug(). Also Add a "net: " prefix to messages to give them some more
context.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: use dev_add_param_string ...

dev_add_param_string allows to pass a priv * so that the device_d *
argument is not needed and can be removed later.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

convert users to %pI4 ...

Convert users of ip_to_string() and print_IPaddr() to %pI4 and
remove the now unused functions.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: Pass network device to net_answer_arp() ...

The caller already has the correct network device, so pass it
to net_answer_arp() rather than using eth_get_current() there.
This is a step towards making a global current network device
unnecessary.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

treewide: fix 'new blank line at EOF' formatting error ...

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: Move library functions to net/lib.c ...

Some network related functions are also needed when networking
is disabled. Move these to a separate file which is always compiled.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: eth: Do not rely on CONFIG_PARAMETER to be enabled ...

register_preset_mac_address only works when CONFIG_PARAMETER
is enabled because otherwise dev_set_param is a no-op. Add a
function to set the MAC address explicitly without the need
of CONFIG_PARAMETER and use it where appropriate.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Merge branch 'for-next/net' ...

Conflicts:
	drivers/net/dm9k.c

net: show enetaddr in lowercase ...

"ifconfig" and "ip" from normal Linux userspace shows ethernet addresses
normally in lowercase.  And the %pM format specifier in Linux does that,
too. Conform to this custom formatting.

Signed-off-by: Holger Schurig <holgerschurig@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: Allow to use multiple network interfaces at once ...

In barebox network packets always go out at the current ethernet
device and are expected to be received from the current interface.
This has some side effects. When for example an NFS is mounted when
one interface is active and the interface is changed afterwards the
NFS packets leave the new interface, but the NFS server won't be
reachable there.

Instead of changing the whole network traffic to the current ethernet
interface we now initialize a network connection with the current
network interface, but then the connection will continue to use that
interface even when the current interface is changed.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: Pass eth_device to net_receive ...

So that barebox has the information which interface a packet
came from.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: Fix error return value for string_to_ethaddr ...

Return a proper error code instead of -1 which would be -EPERM.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

barebox: remove double semicolons ...

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: fix checksum verification ...

Checksum calculation on data including its own checksum (as is the case with
IP headers) should give 0xffff before bit flipping. Current code works well
for the correct checksum case, but fails to identify errors.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

net: store ethernet device parameters in device ...

Rather than storing the parameters globally and trying to keep them
in sync with the device parameters, store the parameters in the ethernet
device directly. Also, update to dev_add_param_ip().

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mem: add the swab (swap bytes) option to memory_display() ...

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>