[riot-notifications] [RIOT-OS/RIOT] gnrc_ipv6_nib: don't autoconfig IPv6 address without L2 addr [backport 2019.04] (#11430)

danpetry notifications at github.com
Tue Apr 23 12:40:41 CEST 2019

# Backport of #10483

### Contribution description
If the interface's link-layer doesn't use link-layer addresses it obviously doesn't make sense to auto-configure an IPv6 address from it. Moreover, I think the address `fe80::` is actual illegal, but I couldn't find any references for it.

### Testing procedure
Try running an application with `slipdev`. The interfaces should not have an auto-configured IPv6 address with this PR. Without this PR an address `fe80::` (and the respective solicited nodes multicast address) show up.

### Issues/PRs references
Unrelated but found when debugging #10480.
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-- Commit Summary --

  * gnrc_ipv6_nib: don't autoconfig IPv6 address without L2 addr

-- File Changes --

    M sys/net/gnrc/network_layer/ipv6/nib/_nib-slaac.c (4)

-- Patch Links --


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