taglinefilesource code
ip_mc_ttl232include/net/sock.hint      ip_mc_ttl;    /* Multicasting TTL */
ip_mc_ttl685net/ipv4/af_inet.csk->ip_mc_ttl=1;
ip_mc_ttl882net/ipv4/ip_output.ciph->ttl = sk->ip_mc_ttl;
ip_mc_ttl202net/ipv4/ip_sockglue.csk->ip_mc_ttl=(int)ucval;
ip_mc_ttl503net/ipv4/ip_sockglue.cval=sk->ip_mc_ttl;