[U-Boot] [PATCH 0/2] net: Additional IP fragmentation check

[Peter Tyser <ptyser@xes-inc.com>]

It looks like U-Boot ignores fragmented IP packets with
non-zero "fragment offset" fields, but doesn't ignore the
initial fragmented IP packet which has a "fragment offset"
field value of 0.

An additional check was added to catch the initial
fragmented packet which should have the "more fragments"
bit set in its flags field.

The bug initially resulted in TFTP transfers which
appeared to work, but in reality failed as some
fragmented packets were received, others were not.
With these patches applied a TFTP download from a
server with a low MTU results in a timeout as U-Boot
drops all incominig fragmented TFTP data packets.


I quickly tried the "Add simple IP/UDP fragmentation
support" patch in the net/testing repository, but
it did not work out of the box.  It looks like U-Boot
was assembling the fragmented packets correctly based on
a memory display of &NetFragBuf, but the assembled
packet was not making its way up the stack FWIW.

Peter Tyser (2):
  net: Define IP flag field values
  net: Add additional IP fragmentation check

 include/net.h |    6 ++++++
 net/net.c     |    8 +++++---
 2 files changed, 11 insertions(+), 3 deletions(-)