On Wed, May 11, 2022 at 07:13:17PM -0400, Nathan Hartman wrote: > On Wed, May 11, 2022 at 5:19 AM Fotis Panagiotopoulos > <f.j.pa...@gmail.com> wrote: > > > > I was thinking the same thing. > > > > Which layer is responsible for this check? > > IP, UDP, or ICMP? > > > Logically it would seem to me that UDP should do the check and trigger > sending the ICMP unreachable reply when appropriate, though it seems > that it unconditionally calls icmp_reply(), which contains the logic > to *avoid* sending it when it's the ANY or BROADCAST address. In other > words, it is currently is coded in the ICMP layer. > > Looking at struct net_driver_s in include/nuttx/net/netdev.h, I am > reminded that there is also IPv6, which a grep reveals has a similar > handler in the IPv6 ICMP handler in icmpv6_reply() in > net/icmpv6/icmpv6_reply.c. > > There is a function net_is_addr_mcast(), but there is no > net_is_addr_bcast() currently. I think that is the function that needs > to be coded, and then called from icmp_reply().
There is no broadcast in IPv6. Completely replaced by multicast. > I need to go at the moment but I will try to research this further later. -- B.Walter <be...@bwct.de> https://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
