I can agree with Cedric. I use rtems5 with rtems-libbsd. I initialize the network interfaces of my target via dhcpcd and the interfaces are automatically multicast capable.
This works without creating a route:
if (setsockopt(conf->udp, IPPROTO_IP, IP_ADD_MEMBERSHIP,
(char *) &mreq, sizeof(mreq))!=0) {
struct sockaddr_in temp;
char name[40];
...
Heinz
> On 19. Jun 2020, at 17:53, Cedric Berger <ced...@precidata.com> wrote:
>
> 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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