[riot-notifications] [RIOT-OS/RIOT] [gnrc_icmpv6_error] Fixed multicast detection (#12175)

Steffen Robertz notifications at github.com
Thu Sep 5 19:36:08 CEST 2019


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### Contribution description
Fixed gnrc_icmpv6_error.c multicast detection.
When sending a multicast udp packet, icmpv6_errors shouldn't be reported back to the sender.
Currently the src address is being checked for multicast, but it should be the dst address.


### Testing procedure

Send UDP packet to ff02::1 without having a receiver registered/the UDP server started in gnrc_networking on the other nodes. This will lead to errors being send back. 


### Issues/PRs references

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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/12175

-- Commit Summary --

  * [gnrc_icmpv6_error] Fixed multicast detection

-- File Changes --

    M sys/net/gnrc/network_layer/icmpv6/error/gnrc_icmpv6_error.c (2)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/12175.patch
https://github.com/RIOT-OS/RIOT/pull/12175.diff

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https://github.com/RIOT-OS/RIOT/pull/12175
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