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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;
};
struct dppool_item_t
{
struct list_head entry;
struct ipv6db_prefix_t it;
};
static LIST_HEAD(ippool);
static LIST_HEAD(dppool);
static spinlock_t pool_lock;
static struct ipdb_t ipdb;
static struct in6_addr conf_gw_addr;
static void in6_addr_add(struct in6_addr *res, const struct in6_addr *arg)
{
uint16_t n = 0;
int i;
for (i = 15; i >= 0; i--) {
n = (uint16_t)res->s6_addr[i] + arg->s6_addr[i] + (n >> 8);
res->s6_addr[i] = n & 0xff;
}
}
static int in6_addr_cmp(const struct in6_addr *n1, const struct in6_addr *n2)
{
int i;
for (i = 0; i < 16; i++) {
if (n1->s6_addr[i] < n2->s6_addr[i])
return -1;
if (n1->s6_addr[i] > n2->s6_addr[i])
return 1;
}
return 0;
}
static void generate_ippool(struct in6_addr *addr, int mask, int prefix_len)
{
struct ippool_item_t *it;
struct ipv6db_addr_t *a;
struct in6_addr ip, end, step;
memcpy(&ip, addr, sizeof(ip));
memcpy(&end, addr, sizeof(end));
if (mask > 64)
*(uint64_t *)(end.s6_addr + 8) = htobe64(be64toh(*(uint64_t *)(end.s6_addr + 8)) | ((1llu << (128 - mask)) - 1));
else {
memset(end.s6_addr + 8, 0xff, 8);
*(uint64_t *)end.s6_addr = htobe64(be64toh(*(uint64_t *)end.s6_addr) | ((1llu << (64 - mask)) - 1));
}
memset(&step, 0, sizeof(step));
if (prefix_len > 64)
*(uint64_t *)(step.s6_addr + 8) = htobe64(1llu << (128 - prefix_len));
else
*(uint64_t *)step.s6_addr = htobe64(1llu << (64 - prefix_len));
while (in6_addr_cmp(&ip, &end) <= 0) {
it = malloc(sizeof(*it));
memset(it, 0, sizeof(*it));
it->it.owner = &ipdb;
INIT_LIST_HEAD(&it->it.addr_list);
a = malloc(sizeof(*a));
memset(a, 0, sizeof(*a));
memcpy(&a->addr, &ip, sizeof(ip));
a->prefix_len = prefix_len;
list_add_tail(&a->entry, &it->it.addr_list);
list_add_tail(&it->entry, &ippool);
in6_addr_add(&ip, &step);
}
}
static void generate_dppool(struct in6_addr *addr, int mask, int prefix_len)
{
struct dppool_item_t *it;
struct in6_addr ip, end, step;
struct ipv6db_addr_t *a;
memcpy(&ip, addr, sizeof(ip));
memcpy(&end, addr, sizeof(end));
if (mask > 64)
*(uint64_t *)(end.s6_addr + 8) = htobe64(be64toh(*(uint64_t *)(end.s6_addr + 8)) | ((1llu << (128 - mask)) - 1));
else {
memset(end.s6_addr + 8, 0xff, 8);
*(uint64_t *)end.s6_addr = htobe64(be64toh(*(uint64_t *)end.s6_addr) | ((1llu << (64 - mask)) - 1));
}
memset(&step, 0, sizeof(step));
if (prefix_len > 64)
*(uint64_t *)(step.s6_addr + 8) = htobe64(1llu << (128 - prefix_len));
else
*(uint64_t *)step.s6_addr = htobe64(1llu << (64 - prefix_len));
while (in6_addr_cmp(&ip, &end) <= 0) {
it = malloc(sizeof(*it));
memset(it, 0, sizeof(*it));
it->it.owner = &ipdb;
INIT_LIST_HEAD(&it->it.prefix_list);
a = malloc(sizeof(*a));
memset(a, 0, sizeof(*a));
memcpy(&a->addr, &ip, sizeof(ip));
a->prefix_len = prefix_len;
list_add_tail(&a->entry, &it->it.prefix_list);
list_add_tail(&it->entry, &dppool);
in6_addr_add(&ip, &step);
}
}
static void add_prefix(int type, 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 > 127)
goto err;
if (sscanf(ptr2 + 1, "%i", &prefix_len) != 1)
goto err;
if (prefix_len > 128 || prefix_len < mask)
goto err;
if (type)
generate_dppool(&addr, mask, prefix_len);
else
generate_ippool(&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 ap_session *ses)
{
struct ippool_item_t *it;
struct ipv6db_addr_t *a;
spin_lock(&pool_lock);
if (!list_empty(&ippool)) {
it = list_entry(ippool.next, typeof(*it), entry);
list_del(&it->entry);
} else
it = NULL;
spin_unlock(&pool_lock);
if (it) {
a = list_entry(it->it.addr_list.next, typeof(*a), entry);
if (a->prefix_len == 128) {
memcpy(&it->it.intf_id, conf_gw_addr.s6_addr + 8, 8);
memcpy(&it->it.peer_intf_id, a->addr.s6_addr + 8, 8);
} else {
it->it.intf_id = 0;
it->it.peer_intf_id = 0;
}
return &it->it;
}
return NULL;
}
static void put_ip(struct ap_session *ses, 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 ipv6db_prefix_t *get_dp(struct ap_session *ses)
{
struct dppool_item_t *it;
spin_lock(&pool_lock);
if (!list_empty(&dppool)) {
it = list_entry(dppool.next, typeof(*it), entry);
list_del(&it->entry);
} else
it = NULL;
spin_unlock(&pool_lock);
return it ? &it->it : NULL;
}
static void put_dp(struct ap_session *ses, struct ipv6db_prefix_t *it)
{
struct dppool_item_t *pit = container_of(it, typeof(*pit), it);
spin_lock(&pool_lock);
list_add_tail(&pit->entry, &dppool);
spin_unlock(&pool_lock);
}
static struct ipdb_t ipdb = {
.get_ipv6 = get_ip,
.put_ipv6 = put_ip,
.get_ipv6_prefix = get_dp,
.put_ipv6_prefix = put_dp,
};
static void ippool_init(void)
{
struct conf_sect_t *s = conf_get_section("ipv6-pool");
struct conf_option_t *opt;
spinlock_init(&pool_lock);
if (!s)
return;
list_for_each_entry(opt, &s->items, entry) {
if (!strcmp(opt->name, "gw-ip6-address")) {
if (inet_pton(AF_INET6, opt->val, &conf_gw_addr) == 0)
log_error("ipv6_pool: failed to parse gw-ip6-address\n");
} else if (!strcmp(opt->name, "delegate"))
add_prefix(1, opt->val);
else
add_prefix(0, opt->name);
}
ipdb_register(&ipdb);
}
DEFINE_INIT(51, ippool_init);
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