You can test change in add_grec(...) by follow codes. without the
change no change to exclude report will be sent.
please adjust IFINDEX and make sure initial state for FF02::2 is idle
===================================================
#include <stdio.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/types.h>
#define IFINDEX 6
int main(int argc, char argv[])
{
int sockfds[2];
struct ipv6_mreq req;
struct group_filter filter;
struct sockaddr_in6 *psin6;
req.ipv6mr_interface = IFINDEX;
inet_pton(PF_INET6, "FF02::2", &req.ipv6mr_multiaddr);
sockfds[0] = socket(PF_INET6, SOCK_DGRAM, 0);
sockfds[1] = socket(PF_INET6, SOCK_DGRAM, 0);
filter.gf_interface = IFINDEX;
filter.gf_fmode = MCAST_INCLUDE;
filter.gf_numsrc = 1;
psin6 = (struct sockaddr_in6 *)&filter.gf_group;
psin6->sin6_family = AF_INET6;
inet_pton(PF_INET6, "FF02::2", &psin6->sin6_addr);
psin6 = (struct sockaddr_in6 *)&filter.gf_slist[0];
psin6->sin6_family = AF_INET6;
inet_pton(PF_INET6, "2002:de12:1780::1", &psin6->sin6_addr);
setsockopt(sockfds[0], SOL_IPV6, IPV6_ADD_MEMBERSHIP, &req, sizeof(req));
setsockopt(sockfds[0], SOL_IPV6, MCAST_MSFILTER, &filter, sizeof(filter));
sleep(5);
setsockopt(sockfds[1], SOL_IPV6, IPV6_ADD_MEMBERSHIP, &req, sizeof(req));
pause();
return 0;
}
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