igmp_mc_iter_state
#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
sizeof(struct igmp_mc_iter_state));