[riot-notifications] [RIOT-OS/RIOT] gnrc_ipv6_ext_frag: Initial import of IPv6 fragmentation (#11623)

Martine Lenders notifications at github.com
Tue Jun 4 10:58:20 CEST 2019

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Therefore, before describing what your contribution is about, we would like
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### Contribution description
This provides IPv6 fragmentation for GNRC. Reassembly was introduced in https://github.com/RIOT-OS/RIOT/pull/11596 but that PR is independent from this one (though it touches similar files).

Put here the description of your contribution:
- describe which part(s) of RIOT is (are) involved
- if it's a bug fix, describe the bug that it solves and how it is solved
- you can also give more information to reviewers about how to test your changes

### Testing procedure
Will provide tests, but

BOARD=native USEMODULE=gnrc_ipv6_ext_frag make -C tests/gnrc_udp all term

and sending large (> 1500 bytes) UDP packets to the host's TAP bridge works.

Details steps to test your contribution:
- which test/example to compile for which board and is there a 'test' command
- how to know that it was not working/available in master
- the expected success test output

### Issues/PRs references
Addresses #5371 in part.

Depends on #11593 and #11622.

Touches similar files as #11596 but can be merged independent.
Examples: Fixes #1234. See also #5678. Depends on PR #9876.

Please use keywords (e.g., fixes, resolve) with the links to the issues you
resolved, this way they will be automatically closed when your pull request
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-- Commit Summary --

  * ipv6_ext: add fragmentation extension definitions
  * tests: provide unittests for ipv6_ext_frag
  * fixup! tests: provide unittests for ipv6_ext_frag
  * fixup! ipv6_ext: add fragmentation extension definitions
  * fixup! fixup! tests: provide unittests for ipv6_ext_frag
  * Merge branch 'ipv6_ext/feat/frag' into HEAD
  * gnrc_ipv6_ext: fix packet snip type
  * Merge branch 'gnrc_ipv6_ext/fix/nettype' into HEAD
  * gnrc_ipv6_ext_frag: Initial import of IPv6 fragmentation
  * gnrc_ipv6: use fragmentation if available

-- File Changes --

    M Makefile.dep (5)
    M sys/include/net/gnrc/ipv6/ext.h (16)
    A sys/include/net/gnrc/ipv6/ext/frag.h (81)
    M sys/include/net/ipv6/ext.h (1)
    A sys/include/net/ipv6/ext/frag.h (119)
    M sys/net/gnrc/Makefile (3)
    A sys/net/gnrc/network_layer/ipv6/ext/frag/Makefile (3)
    A sys/net/gnrc/network_layer/ipv6/ext/frag/gnrc_ipv6_ext_frag.c (252)
    M sys/net/gnrc/network_layer/ipv6/ext/gnrc_ipv6_ext.c (2)
    M sys/net/gnrc/network_layer/ipv6/gnrc_ipv6.c (68)
    M tests/unittests/tests-ipv6_hdr/tests-ipv6_hdr.c (68)

-- Patch Links --


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