/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * NetLabel Domain Hash Table
 *
 * This file manages the domain hash table that NetLabel uses to determine
 * which network labeling protocol to use for a given domain.  The NetLabel
 * system manages static and dynamic label mappings for network protocols such
 * as CIPSO and RIPSO.
 *
 * Author: Paul Moore <paul@paul-moore.com>
 */

/*
 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
 */

#ifndef _NETLABEL_DOMAINHASH_H
#define _NETLABEL_DOMAINHASH_H

#include <linux/types.h>
#include <linux/rcupdate.h>
#include <linux/list.h>

#include "netlabel_addrlist.h"

/* Domain hash table size */
/* XXX - currently this number is an uneducated guess */
#define NETLBL_DOMHSH_BITSIZE       7

/* Domain mapping definition structures */
struct netlbl_domaddr_map {
        struct list_head list4;
        struct list_head list6;
};
struct netlbl_dommap_def {
        u32 type;
        union {
                struct netlbl_domaddr_map *addrsel;
                struct cipso_v4_doi *cipso;
                struct calipso_doi *calipso;
        };
};
#define netlbl_domhsh_addr4_entry(iter) \
        container_of(iter, struct netlbl_domaddr4_map, list)
struct netlbl_domaddr4_map {
        struct netlbl_dommap_def def;

        struct netlbl_af4list list;
};
#define netlbl_domhsh_addr6_entry(iter) \
        container_of(iter, struct netlbl_domaddr6_map, list)
struct netlbl_domaddr6_map {
        struct netlbl_dommap_def def;

        struct netlbl_af6list list;
};

struct netlbl_dom_map {
        char *domain;
        struct netlbl_dommap_def def;
        u16 family;

        u32 valid;
        struct list_head list;
        struct rcu_head rcu;
};

/* init function */
int netlbl_domhsh_init(u32 size);

/* Manipulate the domain hash table */
int netlbl_domhsh_add(struct netlbl_dom_map *entry,
                      struct netlbl_audit *audit_info);
int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
                              struct netlbl_audit *audit_info);
int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry,
                               struct netlbl_audit *audit_info);
int netlbl_domhsh_remove_af4(const char *domain,
                             const struct in_addr *addr,
                             const struct in_addr *mask,
                             struct netlbl_audit *audit_info);
int netlbl_domhsh_remove_af6(const char *domain,
                             const struct in6_addr *addr,
                             const struct in6_addr *mask,
                             struct netlbl_audit *audit_info);
int netlbl_domhsh_remove(const char *domain, u16 family,
                         struct netlbl_audit *audit_info);
int netlbl_domhsh_remove_default(u16 family, struct netlbl_audit *audit_info);
struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain, u16 family);
struct netlbl_dommap_def *netlbl_domhsh_getentry_af4(const char *domain,
                                                     __be32 addr);
#if IS_ENABLED(CONFIG_IPV6)
struct netlbl_dommap_def *netlbl_domhsh_getentry_af6(const char *domain,
                                                   const struct in6_addr *addr);
int netlbl_domhsh_remove_af6(const char *domain,
                             const struct in6_addr *addr,
                             const struct in6_addr *mask,
                             struct netlbl_audit *audit_info);
#endif /* IPv6 */

int netlbl_domhsh_walk(u32 *skip_bkt,
                     u32 *skip_chain,
                     int (*callback) (struct netlbl_dom_map *entry, void *arg),
                     void *cb_arg);

#endif