On 18.06.20 22:47, Joel Sherrill wrote:
Hi
I have an example FACE application I am trying to port to RTEMS. This
is a multi-question email:
First, it fails with EADDRNOTAVAIL on this call:
// Subscribe to multicast group
struct ip_mreq mreq;
rc = inet_pton(AF_INET, multicastGroup_m,
&mreq.imr_multiaddr.s_addr);
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
rc = setsockopt(
new_socket,
IPPROTO_IP,
IP_ADD_MEMBERSHIP,
&mreq,
sizeof(mreq)
);
I assume that is because there is no multicast route. On Linux, you
have to do an ifconfig and route to have a multicast route, but I
haven't been able to find a multicast setup example for FreeBSD. The
Linux commands are:
ifconfig lo multicast
route add -net 224.0.0.0 netmask 240.0.0.0 dev lo
This:
https://gist.github.com/hostilefork/f7cae3dc33e7416f2dd25a402857b6c6
Compiles and run without any special configuration on FreeBSD 12.1
The handbook claims that "Multicast applications do not require any
special configuration in order to run on FreeBSD"
https://www.freebsd.org/doc/handbook/network-routing.html
Following is the routing table on a FreeBSD jail with no special 224
route needed.
Cédric
# netstat -nr
Routing tables
Internet:
Destination Gateway Flags Netif Expire
default 172.18.12.1 UGS epair25b
127.0.0.1 link#1 UH lo0
172.18.12.0/24 link#3 U epair25b
172.18.12.25 link#3 UHS lo0
Internet6:
Destination Gateway Flags Netif Expire
::/96 ::1 UGRS lo0
::1 link#1 UH lo0
::ffff:0.0.0.0/96 ::1 UGRS lo0
fe80::/10 ::1 UGRS lo0
fe80::%lo0/64 link#1 U lo0
fe80::1%lo0 link#1 UHS lo0
ff02::/16 ::1 UGRS lo0
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