Re: [lwip-users] multiple netifs in no_sys environment

[steffen.storck]

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Thank your for your answer.

I made it work by defining  the LWIP_ARP_FILTER_NETIF_FN function in 
netif_input() to determine which netif to use for sending and further checks.

Thanks again.

Code of the filter function looks like this


struct netif *netif_filter(void *p, struct netif *netif, unsigned short type)
{
uint32_t addr;

switch(type)
{
case ETHTYPE_IP:
if(((struct pbuf*) p)->len < ETH_IP_DESTINATION_IP_POS + sizeof(addr)) return 
netif;
memcpy(&addr, (uint8_t*) (((struct pbuf*) p)->payload)+ 
(ETH_IP_DESTINATION_IP_POS + ETH_PAD_SIZE), sizeof(addr));
break;

case ETHTYPE_ARP:
if(((struct pbuf*) p)->len < ETH_ARP_DESTINATION_IP_POS + sizeof(addr)) return 
netif;
memcpy(&addr, (uint8_t*) (((struct pbuf*) 
p)->payload)+(ETH_ARP_DESTINATION_IP_POS + ETH_PAD_SIZE), sizeof(addr));
break;

default:
return netif;
}


if(addr^netif->ip_addr.addr)
{
for(uint32_t i=0; i<xnetif_count; i++)
{
struct netif *const ptr = xnetif+i;
if(!(addr^ptr->ip_addr.addr)) return ptr;
}
}

return netif;
}


- -----Ursprüngliche Nachricht-----
Von: lwip-users <lwip-users-bounces+steffen.storck=address@hidden> Im Auftrag 
von Sergio R. Caprile
Gesendet: Montag, 29. April 2019 14:59
An: address@hidden
Betreff: Re: [lwip-users] multiple netifs in no_sys environment

The lwIP stack will not work as a router unless you actually write the
routing code yourself. Since in your scenario the non-local address is
the device netif address, that should work. If it were some other host
in that very same network (172...) connected to the lwIP device, it
would not (unless you write the code).
How to do it: you just setup two netifs. I would set the 192... to
default. Try the echo server and it should work.

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