ip_msfilter
extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
(sizeof(struct ip_msfilter) - sizeof(__u32) \
int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
offsetof(struct ip_msfilter, imsf_slist_flex),
struct ip_msfilter *msf;
struct ip_msfilter msf;
struct ip_msfilter *msf;
(sizeof(struct ip_msfilter) - sizeof(__u32) \