Re: RE: [lwip-users] Checksum Incorrect caused by Concatenation

[Simon Goldschmidt]

Just sending a post a second time is normally not a way to attract much 
attention...


"Hervé GARAT : Audemat" wrote:
> 
> Kieran said:
> >No, that's wrong.  p->len refers to the length of each individual pbuf.
> >We've added another pbuf to the chain, but not changed the length of
> >each pbuf.  Because the chain is longer, we increment the length of
> >p->tot_len, but not the length of p->len.
> 
> But in the inet_chksum_pseudo function,the len used to make checksum is
> p->len and not p->tot_len. However the message sent is long as p->tot_len,
> therefore the TCP checksum is Incorrect!! 
> 
> All the other change that I made(queuelen--
> ;pbuf_free(p->queuelen);...)are made to have a valid checksum if LWIP do a 
> concatenation.

As Kieran also said, the pbuf_free() is *wrong*, too.

> 
> What's the best way to solve my problem?

To be able to tell you that I would have to get your problem first. In my 
software, the same code path is executed and there is no error.

Simon
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