[lwip-devel] [bug #46467] ip_frag() shouldn't modify pbuf in case of a retransmission

[Joel Cunningham]

Follow-up Comment #3, bug #46467 (project lwip):

Op,

Is IP frag's modification occurring during the TX of the TCP packet?  If so,
there is still only a single reference to the pbuf (held by TCP layer) and it
will be modified as the lower layers (IP, ARP, etc) perform their output
processing.  As long as they aren't modifying TCP header or payload, things
should be fine.

If the packet is enqueued in a driver or lower level, then the reference count
would need to be incremented and measures would need to be taken if a
modification happens at a later time that could contend with TCP
retransmission.  Simon and I discussed this in
https://savannah.nongnu.org/task/?7896



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