/* Copyright 2015 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. */

#ifndef ROUTINGTABLE_H
#define ROUTINGTABLE_H

#include <linux/list.h>
#include <linux/ip.h>
#include <linux/ipv6.h>

struct routing_table {
	struct hlist_head head;
};

void routing_table_init(struct routing_table *table);
void routing_table_free(struct routing_table *table);
int routing_table_insert_v4(struct routing_table *table, struct in_addr ip, uint8_t cidr, void *value);
int routing_table_insert_v6(struct routing_table *table, struct in6_addr ip, uint8_t cidr, void *value);
void *routing_table_lookup_v4(struct routing_table *table, struct in_addr ip);
void *routing_table_lookup_v6(struct routing_table *table, struct in6_addr ip);
int routing_table_remove_v4(struct routing_table *table, struct in_addr ip, uint8_t cidr);
int routing_table_remove_v6(struct routing_table *table, struct in6_addr ip, uint8_t cidr);
int routing_table_remove_by_value(struct routing_table *table, void *value);
int routing_table_walk_ips(struct routing_table *table, void *ctx, int (*func)(void *ctx, void *value, union nf_inet_addr ip, uint8_t cidr, uint8_t ip_version));
int routing_table_walk_ips_by_value(struct routing_table *table, void *ctx, void *value, int (*func)(void *ctx, union nf_inet_addr ip, uint8_t cidr, uint8_t ip_version));

static inline void *routing_table_lookup_dst(struct routing_table *table, struct sk_buff *skb)
{
	switch (ip_hdr(skb)->version) {
		case 4:
			return routing_table_lookup_v4(table, *(struct in_addr *)&ip_hdr(skb)->daddr);
		case 6:
			return routing_table_lookup_v6(table, ipv6_hdr(skb)->daddr);
		default:
			return NULL;
	}
}

static inline void *routing_table_lookup_src(struct routing_table *table, struct sk_buff *skb)
{
	switch (ip_hdr(skb)->version) {
		case 4:
			return routing_table_lookup_v4(table, *(struct in_addr *)&ip_hdr(skb)->saddr);
		case 6:
			return routing_table_lookup_v6(table, ipv6_hdr(skb)->saddr);
		default:
			return NULL;
	}
}

#ifdef DEBUG
void routing_table_selftest(void);
#endif

#endif