rbuf: drop overlapped fragment only if offset or size differs from previous one.
rbuf: drop overlapped fragment only if offset or size differs from previous one.

https://tools.ietf.org/html/rfc4944#section-5.3 says:

> If a link fragment that overlaps another fragment is received, as
> identified above, and differs in either the size or datagram_offset
> of the overlapped fragment, the fragment(s) already accumulated in
> the reassembly buffer SHALL be discarded.  A fresh reassembly may be
> commenced with the most recently received link fragment.

katezilla/RIOT,thomaseichinger/RIOT,Ell-i/RIOT,biboc/RIOT,kaleb-himes/RIOT,zhuoshuguo/RIOT,jfischer-phytec-iot/RIOT,dailab/RIOT,shady33/RIOT,dkm/RIOT,rajma996/RIOT,wentaoshang/RIOT,cladmi/RIOT,MohmadAyman/RIOT,Yonezawa-T2/RIOT,syin2/RIOT,shady33/RIOT,LudwigKnuepfer/RIOT,BytesGalore/RIOT,TobiasFredersdorf/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,tfar/RIOT,yogo1212/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,x3ro/RIOT,kYc0o/RIOT,adrianghc/RIOT,ks156/RIOT,MohmadAyman/RIOT,adjih/RIOT,beurdouche/RIOT,gebart/RIOT,josephnoir/RIOT,brettswann/RIOT,d00616/RIOT,jremmert-phytec-iot/RIOT,thomaseichinger/RIOT,zhuoshuguo/RIOT,avmelnikoff/RIOT,authmillenon/RIOT,rfuentess/RIOT,dailab/RIOT,alignan/RIOT,TobiasFredersdorf/RIOT,basilfx/RIOT,Ell-i/RIOT,Yonezawa-T2/RIOT,authmillenon/RIOT,MohmadAyman/RIOT,gautric/RIOT,d00616/RIOT,kerneltask/RIOT,smlng/RIOT,cladmi/RIOT,adjih/RIOT,FrancescoErmini/RIOT,Hyungsin/RIOT-OS,rousselk/RIOT,josephnoir/RIOT,plushvoxel/RIOT,avmelnikoff/RIOT,neiljay/RIOT,rousselk/RIOT,attdona/RIOT,aeneby/RIOT,dkm/RIOT,neumodisch/RIOT,shady33/RIOT,aeneby/RIOT,mfrey/RIOT,plushvoxel/RIOT,katezilla/RIOT,ant9000/RIOT,neiljay/RIOT,kYc0o/RIOT,TobiasFredersdorf/RIOT,OlegHahm/RIOT,zhuoshuguo/RIOT,kaspar030/RIOT,dkm/RIOT,OlegHahm/RIOT,Ell-i/RIOT,tfar/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,Ell-i/RIOT,FrancescoErmini/RIOT,plushvoxel/RIOT,altairpearl/RIOT,syin2/RIOT,miri64/RIOT,alignan/RIOT,avmelnikoff/RIOT,MohmadAyman/RIOT,malosek/RIOT,plushvoxel/RIOT,A-Paul/RIOT,neumodisch/RIOT,aeneby/RIOT,asanka-code/RIOT,adjih/RIOT,d00616/RIOT,jbeyerstedt/RIOT-OTA-update,kaspar030/RIOT,kb2ma/RIOT,jremmert-phytec-iot/RIOT,jremmert-phytec-iot/RIOT,gautric/RIOT,Yonezawa-T2/RIOT,miri64/RIOT,toonst/RIOT,RIOT-OS/RIOT,gebart/RIOT,Josar/RIOT,gebart/RIOT,josephnoir/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,gautric/RIOT,syin2/RIOT,backenklee/RIOT,A-Paul/RIOT,Yonezawa-T2/RIOT,gebart/RIOT,jfischer-phytec-iot/RIOT,altairpearl/RIOT,ks156/RIOT,lazytech-org/RIOT,neiljay/RIOT,rakendrathapa/RIOT,ant9000/RIOT,avmelnikoff/RIOT,RIOT-OS/RIOT,aeneby/RIOT,attdona/RIOT,alignan/RIOT,wentaoshang/RIOT,rfuentess/RIOT,basilfx/RIOT,rfuentess/RIOT,ant9000/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,immesys/RiSyn,basilfx/RIOT,asanka-code/RIOT,neumodisch/RIOT,kaleb-himes/RIOT,biboc/RIOT,ant9000/RIOT,roberthartung/RIOT,mtausig/RIOT,roberthartung/RIOT,hamilton-mote/RIOT-OS,rfuentess/RIOT,hamilton-mote/RIOT-OS,LudwigKnuepfer/RIOT,mfrey/RIOT,alignan/RIOT,biboc/RIOT,BytesGalore/RIOT,malosek/RIOT,kYc0o/RIOT,kerneltask/RIOT,immesys/RiSyn,kYc0o/RIOT,brettswann/RIOT,ant9000/RIOT,immesys/RiSyn,neiljay/RIOT,lazytech-org/RIOT,smlng/RIOT,jfischer-phytec-iot/RIOT,OTAkeys/RIOT,altairpearl/RIOT,BytesGalore/RIOT,altairpearl/RIOT,MohmadAyman/RIOT,Hyungsin/RIOT-OS,jasonatran/RIOT,yogo1212/RIOT,jremmert-phytec-iot/RIOT,alignan/RIOT,LudwigKnuepfer/RIOT,rakendrathapa/RIOT,BytesGalore/RIOT,jbeyerstedt/RIOT-OTA-update,dailab/RIOT,asanka-code/RIOT,Hyungsin/RIOT-OS,Josar/RIOT,Yonezawa-T2/RIOT,kbumsik/RIOT,mtausig/RIOT,kaleb-himes/RIOT,basilfx/RIOT,rajma996/RIOT,rajma996/RIOT,rajma996/RIOT,ks156/RIOT,backenklee/RIOT,dailab/RIOT,Ell-i/RIOT,yogo1212/RIOT,jfischer-phytec-iot/RIOT,MohmadAyman/RIOT,josephnoir/RIOT,RIOT-OS/RIOT,asanka-code/RIOT,kb2ma/RIOT,jremmert-phytec-iot/RIOT,kbumsik/RIOT,d00616/RIOT,kaleb-himes/RIOT,neumodisch/RIOT,hamilton-mote/RIOT-OS,miri64/RIOT,tfar/RIOT,authmillenon/RIOT,backenklee/RIOT,altairpearl/RIOT,josephnoir/RIOT,kb2ma/RIOT,attdona/RIOT,lazytech-org/RIOT,yogo1212/RIOT,LudwigOrtmann/RIOT,rfuentess/RIOT,LudwigKnuepfer/RIOT,tfar/RIOT,thomaseichinger/RIOT,kaleb-himes/RIOT,cladmi/RIOT,Josar/RIOT,biboc/RIOT,gautric/RIOT,kYc0o/RIOT,shady33/RIOT,kb2ma/RIOT,shady33/RIOT,yogo1212/RIOT,jasonatran/RIOT,adrianghc/RIOT,adrianghc/RIOT,x3ro/RIOT,FrancescoErmini/RIOT,immesys/RiSyn,Hyungsin/RIOT-OS,gebart/RIOT,immesys/RiSyn,kerneltask/RIOT,kb2ma/RIOT,syin2/RIOT,kaspar030/RIOT,lazytech-org/RIOT,Hyungsin/RIOT-OS,cladmi/RIOT,beurdouche/RIOT,wentaoshang/RIOT,mtausig/RIOT,aeneby/RIOT,FrancescoErmini/RIOT,backenklee/RIOT,beurdouche/RIOT,authmillenon/RIOT,altairpearl/RIOT,rajma996/RIOT,adjih/RIOT,thomaseichinger/RIOT,FrancescoErmini/RIOT,jbeyerstedt/RIOT-OTA-update,LudwigOrtmann/RIOT,wentaoshang/RIOT,toonst/RIOT,brettswann/RIOT,syin2/RIOT,kbumsik/RIOT,A-Paul/RIOT,A-Paul/RIOT,LudwigOrtmann/RIOT,cladmi/RIOT,biboc/RIOT,ks156/RIOT,attdona/RIOT,tfar/RIOT,foss-for-synopsys-dwc-arc-processors/RIOT,smlng/RIOT,LudwigOrtmann/RIOT,toonst/RIOT,Josar/RIOT,dkm/RIOT,authmillenon/RIOT,kerneltask/RIOT,attdona/RIOT,kaspar030/RIOT,zhuoshuguo/RIOT,neiljay/RIOT,kerneltask/RIOT,OlegHahm/RIOT,smlng/RIOT,neumodisch/RIOT,adjih/RIOT,katezilla/RIOT,rakendrathapa/RIOT,LudwigOrtmann/RIOT,hamilton-mote/RIOT-OS,brettswann/RIOT,jremmert-phytec-iot/RIOT,beurdouche/RIOT,mfrey/RIOT,toonst/RIOT,jasonatran/RIOT,x3ro/RIOT,mfrey/RIOT,rakendrathapa/RIOT,roberthartung/RIOT,roberthartung/RIOT,thomaseichinger/RIOT,mfrey/RIOT,OTAkeys/RIOT,toonst/RIOT,TobiasFredersdorf/RIOT,kbumsik/RIOT,jasonatran/RIOT,rousselk/RIOT,malosek/RIOT,katezilla/RIOT,d00616/RIOT,brettswann/RIOT,zhuoshuguo/RIOT,shady33/RIOT,hamilton-mote/RIOT-OS,mtausig/RIOT,miri64/RIOT,adrianghc/RIOT,beurdouche/RIOT,jasonatran/RIOT,FrancescoErmini/RIOT,OlegHahm/RIOT,malosek/RIOT,immesys/RiSyn,miri64/RIOT,jbeyerstedt/RIOT-OTA-update,dkm/RIOT,rousselk/RIOT,rajma996/RIOT,x3ro/RIOT,adrianghc/RIOT,mtausig/RIOT,malosek/RIOT,Josar/RIOT,authmillenon/RIOT,neumodisch/RIOT,ks156/RIOT,rakendrathapa/RIOT,BytesGalore/RIOT,rousselk/RIOT,attdona/RIOT,d00616/RIOT,smlng/RIOT,brettswann/RIOT,asanka-code/RIOT,kbumsik/RIOT,lazytech-org/RIOT,OTAkeys/RIOT,wentaoshang/RIOT,LudwigOrtmann/RIOT,basilfx/RIOT,avmelnikoff/RIOT,gautric/RIOT,TobiasFredersdorf/RIOT,rakendrathapa/RIOT,dailab/RIOT,Yonezawa-T2/RIOT,OlegHahm/RIOT,jbeyerstedt/RIOT-OTA-update,roberthartung/RIOT,x3ro/RIOT,asanka-code/RIOT,katezilla/RIOT,yogo1212/RIOT,backenklee/RIOT,wentaoshang/RIOT,OTAkeys/RIOT,malosek/RIOT,plushvoxel/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,rousselk/RIOT,LudwigKnuepfer/RIOT,A-Paul/RIOT,jfischer-phytec-iot/RIOT,zhuoshuguo/RIOT