Hi, I have to copy and modify the code of etharp.c since several years. My problem with etharp.c is: My Ssstem includes one microcontroller (with lwip running on it) and several FPGAs. All of them are communicating via TCP/UDP, so i need one instance who can deliver the right ARP responses. And this one is the microcontroller. Unfortunately, the ARP implementation of lwip cannot be extended for this type of response. So i have to copy the code and modify it on every release of lwip.
Martin > Am 05.11.2018 um 19:08 schrieb David M. Zar <d...@qnetsecurity.com>: > > I had the need for the same functionality. > > In etharp.c, at the end of etharp_input, put something like this: > > arp_callback(&sipaddr, (const struct eth_addr*)&hdr->shwaddr, netif->num, > hdr->opcode, p); > > arp_callback is defined in my code and passes whatever is needed by the > callback. Just be sure to NOT free the packet in etharp_input but then do it > in your code (or free it after the callback returns in etharp_input). > > Dave > > On 11/5/2018 10:49 AM, Amena El Homsi wrote: >> Thanks for your reply. So if I want to support it I have to add some changes >> to etharp.c file. Is there a plan to support such feature? >> >> On Mon, Nov 5, 2018 at 6:27 PM goldsi...@gmx.de <mailto:goldsi...@gmx.de> >> <goldsi...@gmx.de <mailto:goldsi...@gmx.de>> wrote: >> On 05.11.2018 16:35, Amena El Homsi wrote: >> > LwIP processes the ARP requests and replies updated the ARP table, >> > then it calls pbuf_free(). >> > Is there a way to send the ARP reply to the host when the host >> > requested lwIP to send an ARP request? >> >> No. >> >> > I was thinking to use raw pcb and define a raw callback function that >> > will inform the host of the result of the ARP request, however >> > raw_input() is not called unless ip4_input is called and since the arp >> > will be processed by etharp_input I will not be able to use raw_pcb. >> >> As you have found out yourself, raw pcbs are raw IP pcbs, not raw >> network packets. It's like that in the socket world... >> >> Simon >> >> _______________________________________________ >> lwip-users mailing list >> lwip-users@nongnu.org <mailto:lwip-users@nongnu.org> >> https://lists.nongnu.org/mailman/listinfo/lwip-users >> <https://lists.nongnu.org/mailman/listinfo/lwip-users> >> >> >> -- >> >> Amena El-Homsi >> Computer & Communication Engineer >> Dipl. Eng, M.S. >> >> >> _______________________________________________ >> lwip-users mailing list >> lwip-users@nongnu.org <mailto:lwip-users@nongnu.org> >> https://lists.nongnu.org/mailman/listinfo/lwip-users >> <https://lists.nongnu.org/mailman/listinfo/lwip-users> > _______________________________________________ > lwip-users mailing list > lwip-users@nongnu.org > https://lists.nongnu.org/mailman/listinfo/lwip-users
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