gnrc_static: don't parse address as prefix

[benpicco]

Contribution description

To parse the static upstream address we should use ipv6_addr_from_str(), not ipv6_prefix_from_str() - otherwise the address will only be considered valid if it comes with a prefix length.

Testing procedure

Run make -C examples/gnrc_border_router PREFIX_CONF=static all term

master

Upstream interface has no pre-configured address

Iface  5  HWaddr: 76:8F:E6:D7:42:6D 
          L2-PDU:1500  MTU:1500  HL:64  RTR  
          Source address length: 6
          Link type: wired
          inet6 addr: fe80::748f:e6ff:fed7:426d  scope: link  VAL
          inet6 group: ff02::2
          inet6 group: ff02::1
          inet6 group: ff02::1:ffd7:426d
          
Iface  6  HWaddr: 56:FE  Channel: 26  NID: 0x23  PHY: O-QPSK 
          Long HWaddr: AE:0F:4D:73:F7:54:56:FE 
           State: IDLE 
          ACK_REQ  L2-PDU:102  MTU:1280  HL:64  RTR  
          RTR_ADV  6LO  IPHC  
          Source address length: 8
          Link type: wireless
          inet6 addr: fe80::ac0f:4d73:f754:56fe  scope: link  VAL
          inet6 addr: 2001:db8::ac0f:4d73:f754:56fe  scope: global  VAL
          inet6 group: ff02::2
          inet6 group: ff02::1
          inet6 group: ff02::1:ff54:56fe

this PR

upstream interface has pre-configured address

Iface  5  HWaddr: 76:8F:E6:D7:42:6D 
          L2-PDU:1500  MTU:1280  HL:64  RTR  
          Source address length: 6
          Link type: wired
          inet6 addr: fe80::748f:e6ff:fed7:426d  scope: link  VAL
 >>>      inet6 addr: 2001:db8:1::1  scope: global  VAL
          inet6 group: ff02::2
          inet6 group: ff02::1
          inet6 group: ff02::1:ffd7:426d
          inet6 group: ff02::1:ff00:1
          
Iface  6  HWaddr: 25:EF  Channel: 26  NID: 0x23  PHY: O-QPSK 
          Long HWaddr: AE:BB:DE:DD:00:85:A5:EF 
           State: IDLE 
          ACK_REQ  L2-PDU:102  MTU:1280  HL:64  RTR  
          RTR_ADV  6LO  IPHC  
          Source address length: 8
          Link type: wireless
          inet6 addr: fe80::acbb:dedd:85:a5ef  scope: link  VAL
          inet6 addr: 2001:db8::acbb:dedd:85:a5ef  scope: global  VAL
          inet6 group: ff02::2
          inet6 group: ff02::1
          inet6 group: ff02::1:ff85:a5ef

Issues/PRs references

[riot-ci]

Murdock results

✔️ PASSED

4e64245 gnrc_static: don't parse address as prefix

Success	Failures	Total	Runtime
6865	0	6865	09m:10s

Artifacts

• Documentation preview

[benpicco]

bors merge

[bors]

Build succeeded:

• Murdock
• static-tests
• tools-build-success