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/* From net/if.h */
#define IFF_MULTICAST 0x800 /* supports multicast */
/* From netinet/in.h */
#define INADDR_ALLHOSTS_GROUP (u_long)0xe0000001 /* 224.0.0.1 */
#define IP_MULTICAST_IF 0x10 /* set/get IP multicast interface */
#define IP_ADD_MEMBERSHIP 0x13 /* add an IP group membership */
#define IP_MULTICAST_TTL 0x11 /* set/get IP multicast timetolive */
/*
* Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP.
*/
struct ip_mreq {
struct in_addr imr_multiaddr; /* IP multicast address of group */
struct in_addr imr_interface; /* local IP address of interface */
};
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