Hi
I suspect a bug.
If incoming packet contains IP header, then outgoing packet has source
address as destination address causing either use of loopback interface or
a failed ARP request.
The reason is that in function ip_output_if_opt() (in file ip.c) parameter
dest points to source ip address after source and destination addresses are
swapped.
The line causing error is in bold below.
/* Should the IP header be generated or is it already included in p? */
if (dest != IP_HDRINCL) {
....
if (ip_addr_isany(src)) {
ip_addr_set(&(iphdr->src), &(netif->ip_addr));
} else {
ip_addr_set(&(iphdr->src), src);
}
IPH_CHKSUM_SET(iphdr, 0);
#if CHECKSUM_GEN_IP
IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen));
#endif
} else {
/* IP header already included in p */
iphdr = p->payload;
dest = &(iphdr->dest);
}
The simplest fix is to move
dest = &(iphdr->dest);
out of else branch so that it applies also to then -part.
Can you confirm the bug and the fix?
Regards,
RS
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