gnrc_ipv6_nib: provide interface on packet queueing [backport 2018.10]#10360
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jia200x merged 1 commit intoRIOT-OS:2018.10-branchfrom Nov 9, 2018
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Without this the first packet to a new link-local address will not be delivered in non-6Lo environments, since the interface is not provided. With this change, if an internet was provided to the address resolver it will be stored within an allocated `gnrc_netif_hdr_t`. At this point [IPv6 already striped](netif strip) the packet of its netif header, so there is no risk that there will be to, in case it was provided and the `netif` came from its existence. (cherry picked from commit ce0c468)
miri64
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Area: arduino API
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Backport of #10356
Contribution description
During release testing I noticed that reproducibly the first ping is always timing out. Some investigation revealed that this is a bug in the address resolver that involves dropping any interface information it has, when it is queueing a packet for which it doesn't know the link-layer address yet.
Without this the first packet to a new link-local address will not be delivered in non-6Lo environments, since the interface is not provided. With this change, if an internet was provided to the address resolver it
will be stored within an allocated
gnrc_netif_hdr_t.At this point [IPv6 already striped](netif strip) the packet of its netif header, so there is no risk that there will be to, in case it was provided and the
netifcame from its existence.Testing procedure
Compile
gnrc_networkingfornativeand try to ping your TAP interface's / bridge's link-local address. The first ping will fail without this commit. With it it will succeed.Issues/PRs references
None