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#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <arpa/inet.h>
#include <endian.h>
#include "ipdb.h"
#include "list.h"
#include "log.h"
#include "spinlock.h"
#include "memdebug.h"
struct ippool_item_t
{
struct list_head entry;
struct ipv6db_item_t it;
};
static LIST_HEAD(ippool);
static spinlock_t pool_lock = SPINLOCK_INITIALIZER;
static struct ipdb_t ipdb;
static void generate_pool(struct in6_addr *addr, int mask, int prefix_len)
{
struct ippool_item_t *it;
uint64_t ip, endip, step;
struct ipv6db_addr_t *a;
ip = be64toh(*(uint64_t *)addr->s6_addr);
endip = ip | ((1llu << (64 - mask)) - 1);
step = 1 << (64 - prefix_len);
for (; ip <= endip; ip += step) {
it = malloc(sizeof(*it));
it->it.owner = &ipdb;
INIT_LIST_HEAD(&it->it.addr_list);
a = malloc(sizeof(*a));
memset(a, 0, sizeof(*a));
*(uint64_t *)a->addr.s6_addr = htobe64(ip);
a->prefix_len = prefix_len;
list_add_tail(&a->entry, &it->it.addr_list);
list_add_tail(&it->entry, &ippool);
}
}
static void add_prefix(const char *_val)
{
char *val = _strdup(_val);
char *ptr1, *ptr2;
struct in6_addr addr;
int prefix_len;
int mask;
ptr1 = strchr(val, '/');
if (!ptr1)
goto err;
*ptr1 = 0;
ptr2 = strchr(ptr1 + 1, ',');
if (!ptr2)
goto err;
*ptr2 = 0;
if (inet_pton(AF_INET6, val, &addr) == 0)
goto err;
if (sscanf(ptr1 + 1, "%i", &mask) != 1)
goto err;
if (mask < 7 || mask > 64)
goto err;
if (sscanf(ptr2 + 1, "%i", &prefix_len) != 1)
goto err;
if (prefix_len > 64 || prefix_len < mask)
goto err;
generate_pool(&addr, mask, prefix_len);
_free(val);
return;
err:
log_error("ipv6_pool: failed to parse '%s'\n", _val);
_free(val);
}
static struct ipv6db_item_t *get_ip(struct ppp_t *ppp)
{
struct ippool_item_t *it;
spin_lock(&pool_lock);
if (!list_empty(&ippool)) {
it = list_entry(ippool.next, typeof(*it), entry);
list_del(&it->entry);
it->it.intf_id = 0;
it->it.peer_intf_id = 0;
} else
it = NULL;
spin_unlock(&pool_lock);
return it ? &it->it : NULL;
}
static void put_ip(struct ppp_t *ppp, struct ipv6db_item_t *it)
{
struct ippool_item_t *pit = container_of(it, typeof(*pit), it);
spin_lock(&pool_lock);
list_add_tail(&pit->entry, &ippool);
spin_unlock(&pool_lock);
}
static struct ipdb_t ipdb = {
.get_ipv6 = get_ip,
.put_ipv6 = put_ip,
};
static void ippool_init(void)
{
struct conf_sect_t *s = conf_get_section("ipv6-pool");
struct conf_option_t *opt;
if (!s)
return;
list_for_each_entry(opt, &s->items, entry)
add_prefix(opt->name);
ipdb_register(&ipdb);
}
DEFINE_INIT(101, ippool_init);
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