gnrc_ipv6: only discard invalid source when assigned to interface [backport 2019.10]#12458
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cgundogan merged 1 commit intoRIOT-OS:2019.10-branchfrom Oct 15, 2019
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While it is correct to not use an invalid address as a source address, it is incorrect to assume that addresses not assigned to the interface (`idx == -1` in the respective piece of code) are invalid: Other than classic forwarding via a FIB, forwarded packets utilizing a IPv6 routing header will pass this check, like any other packet sent by this node. The source address for these is not on the given node, so e.g. source routing is not possible at the moment. (cherry picked from commit b5b52c7)
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Backport of #12442
Contribution description
While it is correct to not use an invalid address as a source address, it is incorrect to assume that addresses not assigned to the interface (
idx == -1in the respective piece of code) are invalid: Other than classic forwarding via a FIB, forwarded packets utilizing a IPv6 routing header will pass this check, like any other packet sent by this node. The source address for these is not on the given node, so e.g. source routing is not possible at the moment.Testing procedure
Testing procedures from #11970 should still work (was unable to test this atm due to lacking hardware).
With #12440 merged
tests/gnrc_rpl_srhpasses (requiresdist/tools/tapsetup/tapsetupto be called before and also must be called withsudo).Issues/PRs references
Follow-up to #11970
Fixes parts of #12436
Accompanies #12440