[lwip-devel] [bug #11400] ARP multi-packet-queue modifies TCP unsent/unacked segment packet pbuf chain into packet queue

[Simon Goldschmidt]

Follow-up Comment #36, bug #11400 (project lwip):

>Hmmm, oh dear it looks like you're right. I hadn't thought there would be a
problem because I assumed the ref count would sort it out.

It would, I think, if pbuf_ref() increased the ref-count of all packets in a
chain instead of only the first one.

About including a 'copy' flag in UDP: the UDP raw API is somewhat different
than the TCP: TCP is given a data and length pointer, here it is ok to give a
copy flag. UDP, however, is directly given a pbuf. Instead of a copy flag, the
application can directly copy the data into a PBUF_RAM. Only lwip_send()
doesn't do that! (Which I think is good -regarding speed-, and the only point
this doesn't work is ARP queueing!)

So, I think I will commit the pbuf_copy() stuff after having a second look
over it.

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