There is a repeating pattern in the struct that is split out into a
subtype in this commit. This makes handling the data easier, as now
done in the print routine.
An EUI provider can provide EUIs for multiple interfaces based on
their index.
For this is should get the index of the interface, not the index of
the EUI provider.
The netif list is used like a stack, so it needs to be
iterated in reverse to keep the registration order.
Time complexity in O(n^2), but the the list is normally very short
(1-2 items).
Before:
```
> ifconfig
Iface 10 HWaddr: 24:0A:C4:E6:0E:9C Channel: 0 Link: down
[..]
Iface 7 HWaddr: 24:0A:C4:E6:0E:9F Link: down
[..]
```
Now they are in the increasing order:
```
> ifconfig
Iface 7 HWaddr: 24:0A:C4:E6:0E:9F Link: down
[..]
Iface 10 HWaddr: 24:0A:C4:E6:0E:9C Channel: 0 Link: down
[..]
```
When lwIP is hacked to use the same shell command, it also
lists it interfaces in the expected order (was ET1,ET0 before):
```
> ifconfig
Iface ET0 HWaddr: 24:0A:C4:E6:0E:9F Link: down
[..]
Iface ET1 HWaddr: 24:0A:C4:E6:0E:9C Channel: 0 Link: down
[..]
```
The assertion is a bit overeager.
In case of receiving a wrong message ID, we re-try receive without
entering the STATE_REQUEST_SEND state again, so it is expected that
we get a non-NULL ctx/response from sock_udp_recv_buf().
What this assert should actually check is that we don't get a non-NULL
ctx after calling sock_udp_recv_buf() with a non-NULL ctx.
So make this explicit to not falsely fail the assertion.
In a881af8b08 we would return early if the subnet did not change,
but we must still send the router advertisement with the route information
option to the upstream network, otherwise hosts in that network will not
consider the downstream subnet off-link.
Module to lock the shell after a given timeout of time x. When the
shell did not receive any input within time x, then the shell is
locked automatically.
Module to lock the running shell with a password. Shell is proceeded only
when the valid password was entered by the user. After 3 failed attempts,
the input is blocked for a few seconds to slow down brute force attacks.
Does not make use of any cryptographic features yet.
- add `netif_get_ipv6()` to query IPv6 (as a slim convenience wrapper
for `netif_get_opt()`)
- add `netifs_get_ipv6()` to query IPv6 addresses of all netifs
- add `netif_print_ipv6()` to print the IPv6 address(es) of a single
netif
- add `netifs_print_ipv6()` to print the IPv6 address(es) of all netifs
