ipv6_ac_socklist
struct ipv6_ac_socklist;
struct ipv6_ac_socklist *ipv6_ac_list;
struct ipv6_ac_socklist *acl_next;
struct ipv6_ac_socklist *pac, *prev_pac;
struct ipv6_ac_socklist *pac;
struct ipv6_ac_socklist *next = pac->acl_next;
struct ipv6_ac_socklist *pac = NULL;
pac = sock_kmalloc(sk, sizeof(struct ipv6_ac_socklist), GFP_KERNEL);