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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2020/11/17 19:18:30 UTC

[GitHub] [incubator-nuttx] patacongo opened a new issue #2328: Limitations in IPv4 Packet Re-assembly

patacongo opened a new issue #2328:
URL: https://github.com/apache/incubator-nuttx/issues/2328


   IPv4 packet re-assembly is implemented in net/devif/ipv4_input.c.  The current implementation, however, has too many limitations to be useful:
   
   1. IPv4 reassembly is untested.
   2. Currently can only work with Ethernet due to the use of Ethernet packet size in the definition of  `IPv4_REASS_BUFSIZE`.
   3. Since there is only a single reassembly buffer, IPv4 reassembly cannot  be used in a context where there may be multiple, concurrent re-assembly packets.
   4. The IPv4 header is variable-length depending up on the options in the header.  The logic here assumes that the size of the IPv4 header is a constant (this is a bug and not a limitation).
   


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