socket_zep: ignore packets sent on the wrong radio channel

[benpicco]

Contribution description

So far, ZEP would accept all frames even if they are sent on the wrong 'channel'.

Apply phy configuration and filter incoming frames based on the radio channel.

Testing procedure

Run examples/gnrc_border_router and examples/gnrc_networking with USE_ZEP=1

main(): This is RIOT! (Version: 2022.10-devel-608-g36eac)
RIOT network stack example application
All up, running the shell now
> ping ff02::1
12 bytes from fe80::ac5a:b682:da1f:f3c1%7: icmp_seq=0 ttl=64 rssi=0 dBm time=0.544 ms
12 bytes from fe80::ac5a:b682:da1f:f3c1%7: icmp_seq=1 ttl=64 rssi=0 dBm time=0.556 ms
12 bytes from fe80::ac5a:b682:da1f:f3c1%7: icmp_seq=2 ttl=64 rssi=0 dBm time=0.565 ms

--- ff02::1 PING statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 0.544/0.555/0.565 ms
> ifconfig 
Iface  7  HWaddr: 3C:10  Channel: 26  NID: 0x23  PHY: O-QPSK 
          Long HWaddr: 6E:C9:17:7D:C9:6E:3C:10 
           State: IDLE 
          ACK_REQ  L2-PDU:102  MTU:1280  HL:64  RTR  
          6LO  IPHC  
          Source address length: 8
          Link type: wireless
          inet6 addr: fe80::6cc9:177d:c96e:3c10  scope: link  VAL
          inet6 group: ff02::2
          inet6 group: ff02::1
          inet6 group: ff02::1:ff6e:3c10
          inet6 group: ff02::1a
          
          Statistics for Layer 2
            RX packets 4  bytes 151
            TX packets 6 (Multicast: 6)  bytes 0
            TX succeeded 6 errors 0
          Statistics for IPv6
            RX packets 4  bytes 220
            TX packets 6 (Multicast: 6)  bytes 334
            TX succeeded 6 errors 0

> ifconfig 7 set chan 20
success: set channel on interface 7 to 20

> ping ff02::1

--- ff02::1 PING statistics ---
3 packets transmitted, 0 packets received, 100% packet loss

> ifconfig 7 set chan 26
success: set channel on interface 7 to 26

> ping ff02::1
12 bytes from fe80::ac5a:b682:da1f:f3c1%7: icmp_seq=0 ttl=64 rssi=0 dBm time=0.556 ms
12 bytes from fe80::ac5a:b682:da1f:f3c1%7: icmp_seq=1 ttl=64 rssi=0 dBm time=0.554 ms
12 bytes from fe80::ac5a:b682:da1f:f3c1%7: icmp_seq=2 ttl=64 rssi=0 dBm time=0.563 ms

--- ff02::1 PING statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 0.554/0.557/0.563 ms

Issues/PRs references

[jia200x]

openDSME likes this

[jia200x]

ACK, I trust your testing