buglwIP - A Lightweight TCP/IP stack - Bugs: bug #56281, arp header process modify back to...


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bug #56281: arp header process modify back to previous version in etharp_input

Submitted by:  Simon Kószó <koszsim>
Submitted on:  Tue 07 May 2019 10:56:54 AM UTC  
Category:  ARP Severity:  3 - Normal
Item Group:  Faulty Behaviour Status:  Invalid
Privacy:  Public Assigned to:  Simon Goldschmidt <goldsimon>
Open/Closed:  Closed Planned Release:  None
lwIP version:  2.0.3

Thu 30 Jan 2020 10:11:06 PM UTC, comment #1: 

No, what you do is not correct. There must be something wrong in the input path of your driver/application that makes this workaround necessary.

I'm sorry, but from comparing the sources of 1.4.1 to 2.0.3, I can't just see what's wrong.

Simon Goldschmidt <goldsimon>
Project AdministratorIn charge of this item.
Tue 07 May 2019 10:56:54 AM UTC, original submission:  

I just wanted to tell how I "fixed" the receiveing of ARP packet in my application. I am quiet starter with lwIP so probably I did something badly when I called etharp_input(). Does anybody can help me to figure out the reason?

I upgraded lwIP from 1.4.1 to 2.0.3. When I finally could build the code and download the program to the target I noticed that it does not respond to ping command. Having debugged the program and compared the code with 1.4.1, I could fix the problem with modifying the code in etharp_input function:

I wrote this statement in line 650 in src/core/ipv4/etharp.c:
hdr = (struct etharp_hdr )((u8_t)p->payload + SIZEOF_ETH_HDR);
instead of this statement:
hdr = (struct etharp_hdr *)p->payload;

Now my program works well in my target.

Thank you if someone try to figure out the possible reason.

Simon Kószó <koszsim>


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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2020-01-30 goldsimon StatusNone => Invalid
        Assigned toNone => goldsimon
        Open/ClosedOpen => Closed

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