ippool: Implement and use blacklist instead of blindly using IPPOOL_NOGATEWAY
Commit dda21ed7d4 modified previous calls
to ippool_new() removing the pass of flags to avoid allocating certain
problematic IPs from the pool to MS, such as the network, gateway and
broadcast IPs.
Today I did some unsucessful tests with osmo-ggsn with a pool "ip prefix
dynamic 176.16.222.0/24", and thus IP 176.16.222.0 was being assigned to
the MS. De-capsulated DNS packets were received in the tun interface,
but the Linux system in there was unable to correctly forward the
packets to the gateway interface connected to the Internet. However,
adding a second MS which got 176.16.222.1 had its packets forwarded
correctly.
However, previous implementation relies on flag IPPOOL_NOGATEWAY flag to
blindly blacklist first IP after the network ip (ie, .0 and .1 are
removed), which limits the IP reserved for the tun device to be .1. If a
different IP in the range is assigned, it may cause issues. As a result,
a blacklist is introduced in this commit to dynamically fetch the tun IP
address and exlucde it from the pool of available IPs.
Change-Id: I8e91f7280d60490c858a769dd578c1c8e54e9243
changes/56/4256/6
parent
a037e5908a
commit
859f9b0752
54
ggsn/ggsn.c
54
ggsn/ggsn.c
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@ -146,10 +146,50 @@ int apn_stop(struct apn_ctx *apn, bool force)
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return 0;
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}
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static int alloc_ippool_blacklist(struct apn_ctx *apn, const struct tun_t *tun, struct in46_prefix **blacklist, bool ipv6)
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{
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int flags, len, len2, i;
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if (ipv6)
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flags = IP_TYPE_IPv6_NONLINK;
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else
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flags = IP_TYPE_IPv4;
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while (1) {
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len = tun_ip_local_get(apn->tun.tun, NULL, 0, flags);
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if (len < 1)
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return len;
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*blacklist = talloc_zero_size(apn, len * sizeof(struct in46_prefix));
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len2 = tun_ip_local_get(apn->tun.tun, *blacklist, len, flags);
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if (len2 < 1) {
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talloc_free(*blacklist);
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return len2;
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}
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if (len2 > len) /* iface was added between 2 calls, repeat operation */
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talloc_free(*blacklist);
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else
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break;
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}
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for (i = 0; i < len2; i++)
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LOGPAPN(LOGL_INFO, apn, "Blacklist tun IP %s\n",
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in46p_ntoa(&(*blacklist)[i]));
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return len2;
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}
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/* actually start the APN with its current config */
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int apn_start(struct apn_ctx *apn)
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{
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int ippool_flags = IPPOOL_NONETWORK | IPPOOL_NOBROADCAST;
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struct in46_prefix ipv6_tun_linklocal_ip;
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struct in46_prefix *blacklist;
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int blacklist_size;
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if (apn->started)
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return 0;
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@ -231,24 +271,34 @@ int apn_start(struct apn_ctx *apn)
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if (apn->v4.cfg.dynamic_prefix.addr.len) {
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LOGPAPN(LOGL_INFO, apn, "Creating IPv4 pool %s\n",
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in46p_ntoa(&apn->v4.cfg.dynamic_prefix));
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if ((blacklist_size = alloc_ippool_blacklist(apn, apn->tun.tun, &blacklist, false)) < 0)
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LOGPAPN(LOGL_ERROR, apn, "Failed obtaining IPv4 tun IPs\n");
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if (ippool_new(&apn->v4.pool, &apn->v4.cfg.dynamic_prefix,
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&apn->v4.cfg.static_prefix, 0)) {
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&apn->v4.cfg.static_prefix, ippool_flags,
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blacklist, blacklist_size)) {
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LOGPAPN(LOGL_ERROR, apn, "Failed to create IPv4 pool\n");
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talloc_free(blacklist);
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apn_stop(apn, false);
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return -1;
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}
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talloc_free(blacklist);
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}
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/* Create IPv6 pool */
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if (apn->v6.cfg.dynamic_prefix.addr.len) {
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LOGPAPN(LOGL_INFO, apn, "Creating IPv6 pool %s\n",
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in46p_ntoa(&apn->v6.cfg.dynamic_prefix));
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if ((blacklist_size = alloc_ippool_blacklist(apn, apn->tun.tun, &blacklist, true)) < 0)
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LOGPAPN(LOGL_ERROR, apn, "Failed obtaining IPv6 tun IPs\n");
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if (ippool_new(&apn->v6.pool, &apn->v6.cfg.dynamic_prefix,
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&apn->v6.cfg.static_prefix, 0)) {
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&apn->v6.cfg.static_prefix, ippool_flags,
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blacklist, blacklist_size)) {
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LOGPAPN(LOGL_ERROR, apn, "Failed to create IPv6 pool\n");
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talloc_free(blacklist);
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apn_stop(apn, false);
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return -1;
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}
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talloc_free(blacklist);
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}
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LOGPAPN(LOGL_NOTICE, apn, "Successfully started\n");
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36
lib/ippool.c
36
lib/ippool.c
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@ -184,9 +184,19 @@ void in46a_inc(struct in46_addr *addr)
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}
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}
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static bool addr_in_prefix_list(struct in46_addr *addr, struct in46_prefix *list, size_t list_size)
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{
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int i;
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for (i = 0; i < list_size; i++) {
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if (in46a_prefix_equal(addr, &list[i].addr))
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return true;
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}
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return false;
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}
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/* Create new address pool */
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int ippool_new(struct ippool_t **this, const struct in46_prefix *dyn, const struct in46_prefix *stat,
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int flags)
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int flags, struct in46_prefix *blacklist, size_t blacklist_size)
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{
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/* Parse only first instance of pool for now */
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@ -210,18 +220,16 @@ int ippool_new(struct ippool_t **this, const struct in46_prefix *dyn, const stru
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if (addr.len == sizeof(struct in6_addr))
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addr.len = 64/8;
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/* Set IPPOOL_NONETWORK if IPPOOL_NOGATEWAY is set */
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if (flags & IPPOOL_NOGATEWAY) {
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flags |= IPPOOL_NONETWORK;
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}
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dynsize = (1 << (addr.len*8 - addrprefixlen));
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if (flags & IPPOOL_NONETWORK) /* Exclude network address from pool */
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dynsize--;
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if (flags & IPPOOL_NOGATEWAY) /* Exclude gateway address from pool */
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dynsize--;
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if (flags & IPPOOL_NOBROADCAST) /* Exclude broadcast address from pool */
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dynsize--;
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/* Exclude included blacklist addresses from pool */
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for (i = 0; i < blacklist_size; i++) {
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if (in46a_within_mask(&blacklist[i].addr, &addr, addrprefixlen))
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dynsize--;
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}
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}
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if (!stat || stat->addr.len == 0) {
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@ -278,13 +286,17 @@ int ippool_new(struct ippool_t **this, const struct in46_prefix *dyn, const stru
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(*this)->firstdyn = NULL;
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(*this)->lastdyn = NULL;
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if (flags & IPPOOL_NOGATEWAY) {
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in46a_inc(&addr);
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in46a_inc(&addr);
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} else if (flags & IPPOOL_NONETWORK) {
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if (flags & IPPOOL_NONETWORK) {
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in46a_inc(&addr);
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}
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for (i = 0; i < dynsize; i++) {
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if (addr_in_prefix_list(&addr, blacklist, blacklist_size)) {
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SYS_ERR(DIP, LOGL_DEBUG, 0,
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"addr blacklisted from pool: %s", in46a_ntoa(&addr));
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in46a_inc(&addr);
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i--;
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continue;
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}
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(*this)->member[i].addr = addr;
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in46a_inc(&addr);
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@ -31,7 +31,6 @@
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#define IPPOOL_NONETWORK 0x01
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#define IPPOOL_NOBROADCAST 0x02
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#define IPPOOL_NOGATEWAY 0x04
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#define IPPOOL_STATSIZE 0x10000
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@ -72,7 +71,8 @@ extern unsigned long int ippool_hash(struct in46_addr *addr);
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/* Create new address pool */
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extern int ippool_new(struct ippool_t **this, const struct in46_prefix *dyn,
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const struct in46_prefix *stat, int flags);
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const struct in46_prefix *stat, int flags,
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struct in46_prefix *blacklist, size_t blacklist_size);
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/* Delete existing address pool */
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extern int ippool_free(struct ippool_t *this);
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@ -13,36 +13,47 @@
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#include "../../lib/syserr.h"
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static struct ippool_t *create_pool(const char *prefix_str, unsigned int flags)
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static struct ippool_t *create_pool(const char *prefix_str, unsigned int flags, char **blacklist, size_t blacklist_size)
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{
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struct in46_prefix *blacklist_pfx;
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struct ippool_t *pool;
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struct in46_prefix pfx;
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size_t t;
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int rc;
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int i;
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blacklist_pfx = calloc(blacklist_size, sizeof(struct in46_prefix));
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for (i = 0; i < blacklist_size; i++) {
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rc = ippool_aton(&blacklist_pfx[i].addr, &t, blacklist[i], 0);
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OSMO_ASSERT(rc == 0);
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pfx.prefixlen = t;
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}
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/* dynamic-only v4 */
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rc = ippool_aton(&pfx.addr, &t, prefix_str, flags);
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rc = ippool_aton(&pfx.addr, &t, prefix_str, 0);
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OSMO_ASSERT(rc == 0);
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pfx.prefixlen = t;
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rc = ippool_new(&pool, &pfx, NULL, flags);
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rc = ippool_new(&pool, &pfx, NULL, flags, blacklist_pfx, blacklist_size);
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OSMO_ASSERT(rc == 0);
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//ippool_printaddr(pool);
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free(blacklist_pfx);
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return pool;
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}
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static void test_pool_size(const char *pfx, unsigned int flags, unsigned int expected_size)
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static void test_pool_size(const char *pfx, unsigned int flags, char **blacklist, size_t blacklist_size, unsigned int expected_size)
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{
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struct ippool_t *pool;
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struct ippoolm_t *member;
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struct in46_addr addr;
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int i, rc, n;
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printf("testing pool for prefix %s, flags=0x%x, expected_size=%u\n", pfx, flags, expected_size);
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pool = create_pool(pfx, flags);
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printf("testing pool for prefix %s, flags=0x%x, blacklist_size=%lu, expected_size=%u\n", pfx, flags, blacklist_size, expected_size);
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pool = create_pool(pfx, flags, blacklist, blacklist_size);
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OSMO_ASSERT(pool->listsize == expected_size);
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memset(&addr, 0, sizeof(addr));
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@ -91,19 +102,23 @@ static void test_pool_size(const char *pfx, unsigned int flags, unsigned int exp
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static void test_pool_sizes(void)
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{
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/* 256 addresses [0..255] */
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test_pool_size("192.168.23.0/24", 0, 256);
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test_pool_size("192.168.23.0/24", 0, NULL, 0, 256);
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/* 255 addresses [1..255] */
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test_pool_size("192.168.23.0/24", IPPOOL_NONETWORK, 255);
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test_pool_size("192.168.23.0/24", IPPOOL_NONETWORK, NULL, 0, 255);
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/* 254 addresses [1..254] */
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test_pool_size("192.168.23.0/24", IPPOOL_NONETWORK | IPPOOL_NOBROADCAST, 254);
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test_pool_size("192.168.23.0/24", IPPOOL_NONETWORK | IPPOOL_NOBROADCAST, NULL, 0, 254);
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/* 65534 addresses [0.1..255.254] */
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test_pool_size("192.168.0.0/16", IPPOOL_NONETWORK | IPPOOL_NOBROADCAST, 65534);
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test_pool_size("192.168.0.0/16", IPPOOL_NONETWORK | IPPOOL_NOBROADCAST, NULL, 0, 65534);
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/* 256 prefixes of /64 each */
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test_pool_size("2001:DB8::/56", 0, 256);
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test_pool_size("2001:DB8::/56", 0, NULL, 0, 256);
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/* 253 addresses [1..254] & exclude 192.168.23.1/24 */
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char *blacklist[] = {"176.16.222.10/24", "192.168.23.1/24", "192.168.38.2/24"};
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test_pool_size("192.168.23.0/24", IPPOOL_NONETWORK | IPPOOL_NOBROADCAST, blacklist, 3, 253);
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}
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int main(int argc, char **argv)
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@ -8,3 +8,5 @@ No more IP addresses available
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No more IP addresses available
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No more IP addresses available
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No more IP addresses available
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No more IP addresses available
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No more IP addresses available
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@ -1,4 +1,4 @@
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testing pool for prefix 192.168.23.0/24, flags=0x0, expected_size=256
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testing pool for prefix 192.168.23.0/24, flags=0x0, blacklist_size=0, expected_size=256
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allocated address 192.168.23.0
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allocated address 192.168.23.1
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allocated address 192.168.23.2
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@ -255,7 +255,7 @@ allocated address 192.168.23.252
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allocated address 192.168.23.253
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allocated address 192.168.23.254
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allocated address 192.168.23.255
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testing pool for prefix 192.168.23.0/24, flags=0x1, expected_size=255
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testing pool for prefix 192.168.23.0/24, flags=0x1, blacklist_size=0, expected_size=255
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allocated address 192.168.23.1
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allocated address 192.168.23.2
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allocated address 192.168.23.3
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@ -511,7 +511,7 @@ allocated address 192.168.23.252
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allocated address 192.168.23.253
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allocated address 192.168.23.254
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allocated address 192.168.23.255
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testing pool for prefix 192.168.23.0/24, flags=0x3, expected_size=254
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testing pool for prefix 192.168.23.0/24, flags=0x3, blacklist_size=0, expected_size=254
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allocated address 192.168.23.1
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allocated address 192.168.23.2
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allocated address 192.168.23.3
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@ -766,7 +766,7 @@ allocated address 192.168.23.251
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allocated address 192.168.23.252
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allocated address 192.168.23.253
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allocated address 192.168.23.254
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testing pool for prefix 192.168.0.0/16, flags=0x3, expected_size=65534
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testing pool for prefix 192.168.0.0/16, flags=0x3, blacklist_size=0, expected_size=65534
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allocated address 192.168.0.1
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allocated address 192.168.0.2
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allocated address 192.168.0.3
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@ -66301,7 +66301,7 @@ allocated address 192.168.255.251
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allocated address 192.168.255.252
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allocated address 192.168.255.253
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allocated address 192.168.255.254
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testing pool for prefix 2001:DB8::/56, flags=0x0, expected_size=256
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testing pool for prefix 2001:DB8::/56, flags=0x0, blacklist_size=0, expected_size=256
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allocated address 2001:db8::
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allocated address 2001:db8:0:1::
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allocated address 2001:db8:0:2::
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@ -66558,3 +66558,257 @@ allocated address 2001:db8:0:fc::
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allocated address 2001:db8:0:fd::
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allocated address 2001:db8:0:fe::
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allocated address 2001:db8:0:ff::
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testing pool for prefix 192.168.23.0/24, flags=0x3, blacklist_size=3, expected_size=253
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allocated address 192.168.23.2
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allocated address 192.168.23.3
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allocated address 192.168.23.4
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allocated address 192.168.23.5
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allocated address 192.168.23.6
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allocated address 192.168.23.7
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allocated address 192.168.23.8
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allocated address 192.168.23.9
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allocated address 192.168.23.10
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allocated address 192.168.23.11
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allocated address 192.168.23.12
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allocated address 192.168.23.13
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allocated address 192.168.23.14
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allocated address 192.168.23.15
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allocated address 192.168.23.16
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allocated address 192.168.23.17
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allocated address 192.168.23.18
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allocated address 192.168.23.19
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allocated address 192.168.23.20
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allocated address 192.168.23.21
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allocated address 192.168.23.22
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allocated address 192.168.23.23
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allocated address 192.168.23.24
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allocated address 192.168.23.25
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allocated address 192.168.23.26
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allocated address 192.168.23.27
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allocated address 192.168.23.28
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allocated address 192.168.23.29
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allocated address 192.168.23.30
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allocated address 192.168.23.31
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allocated address 192.168.23.32
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allocated address 192.168.23.33
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allocated address 192.168.23.34
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allocated address 192.168.23.35
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allocated address 192.168.23.36
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allocated address 192.168.23.37
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allocated address 192.168.23.38
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allocated address 192.168.23.39
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allocated address 192.168.23.40
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allocated address 192.168.23.41
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allocated address 192.168.23.42
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allocated address 192.168.23.43
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allocated address 192.168.23.44
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allocated address 192.168.23.45
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allocated address 192.168.23.46
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allocated address 192.168.23.47
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allocated address 192.168.23.48
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allocated address 192.168.23.49
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allocated address 192.168.23.50
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allocated address 192.168.23.51
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allocated address 192.168.23.52
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allocated address 192.168.23.53
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allocated address 192.168.23.54
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allocated address 192.168.23.55
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allocated address 192.168.23.56
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allocated address 192.168.23.57
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allocated address 192.168.23.58
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allocated address 192.168.23.59
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allocated address 192.168.23.60
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allocated address 192.168.23.61
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allocated address 192.168.23.62
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allocated address 192.168.23.63
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allocated address 192.168.23.64
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allocated address 192.168.23.65
|
||||
allocated address 192.168.23.66
|
||||
allocated address 192.168.23.67
|
||||
allocated address 192.168.23.68
|
||||
allocated address 192.168.23.69
|
||||
allocated address 192.168.23.70
|
||||
allocated address 192.168.23.71
|
||||
allocated address 192.168.23.72
|
||||
allocated address 192.168.23.73
|
||||
allocated address 192.168.23.74
|
||||
allocated address 192.168.23.75
|
||||
allocated address 192.168.23.76
|
||||
allocated address 192.168.23.77
|
||||
allocated address 192.168.23.78
|
||||
allocated address 192.168.23.79
|
||||
allocated address 192.168.23.80
|
||||
allocated address 192.168.23.81
|
||||
allocated address 192.168.23.82
|
||||
allocated address 192.168.23.83
|
||||
allocated address 192.168.23.84
|
||||
allocated address 192.168.23.85
|
||||
allocated address 192.168.23.86
|
||||
allocated address 192.168.23.87
|
||||
allocated address 192.168.23.88
|
||||
allocated address 192.168.23.89
|
||||
allocated address 192.168.23.90
|
||||
allocated address 192.168.23.91
|
||||
allocated address 192.168.23.92
|
||||
allocated address 192.168.23.93
|
||||
allocated address 192.168.23.94
|
||||
allocated address 192.168.23.95
|
||||
allocated address 192.168.23.96
|
||||
allocated address 192.168.23.97
|
||||
allocated address 192.168.23.98
|
||||
allocated address 192.168.23.99
|
||||
allocated address 192.168.23.100
|
||||
allocated address 192.168.23.101
|
||||
allocated address 192.168.23.102
|
||||
allocated address 192.168.23.103
|
||||
allocated address 192.168.23.104
|
||||
allocated address 192.168.23.105
|
||||
allocated address 192.168.23.106
|
||||
allocated address 192.168.23.107
|
||||
allocated address 192.168.23.108
|
||||
allocated address 192.168.23.109
|
||||
allocated address 192.168.23.110
|
||||
allocated address 192.168.23.111
|
||||
allocated address 192.168.23.112
|
||||
allocated address 192.168.23.113
|
||||
allocated address 192.168.23.114
|
||||
allocated address 192.168.23.115
|
||||
allocated address 192.168.23.116
|
||||
allocated address 192.168.23.117
|
||||
allocated address 192.168.23.118
|
||||
allocated address 192.168.23.119
|
||||
allocated address 192.168.23.120
|
||||
allocated address 192.168.23.121
|
||||
allocated address 192.168.23.122
|
||||
allocated address 192.168.23.123
|
||||
allocated address 192.168.23.124
|
||||
allocated address 192.168.23.125
|
||||
allocated address 192.168.23.126
|
||||
allocated address 192.168.23.127
|
||||
allocated address 192.168.23.128
|
||||
allocated address 192.168.23.129
|
||||
allocated address 192.168.23.130
|
||||
allocated address 192.168.23.131
|
||||
allocated address 192.168.23.132
|
||||
allocated address 192.168.23.133
|
||||
allocated address 192.168.23.134
|
||||
allocated address 192.168.23.135
|
||||
allocated address 192.168.23.136
|
||||
allocated address 192.168.23.137
|
||||
allocated address 192.168.23.138
|
||||
allocated address 192.168.23.139
|
||||
allocated address 192.168.23.140
|
||||
allocated address 192.168.23.141
|
||||
allocated address 192.168.23.142
|
||||
allocated address 192.168.23.143
|
||||
allocated address 192.168.23.144
|
||||
allocated address 192.168.23.145
|
||||
allocated address 192.168.23.146
|
||||
allocated address 192.168.23.147
|
||||
allocated address 192.168.23.148
|
||||
allocated address 192.168.23.149
|
||||
allocated address 192.168.23.150
|
||||
allocated address 192.168.23.151
|
||||
allocated address 192.168.23.152
|
||||
allocated address 192.168.23.153
|
||||
allocated address 192.168.23.154
|
||||
allocated address 192.168.23.155
|
||||
allocated address 192.168.23.156
|
||||
allocated address 192.168.23.157
|
||||
allocated address 192.168.23.158
|
||||
allocated address 192.168.23.159
|
||||
allocated address 192.168.23.160
|
||||
allocated address 192.168.23.161
|
||||
allocated address 192.168.23.162
|
||||
allocated address 192.168.23.163
|
||||
allocated address 192.168.23.164
|
||||
allocated address 192.168.23.165
|
||||
allocated address 192.168.23.166
|
||||
allocated address 192.168.23.167
|
||||
allocated address 192.168.23.168
|
||||
allocated address 192.168.23.169
|
||||
allocated address 192.168.23.170
|
||||
allocated address 192.168.23.171
|
||||
allocated address 192.168.23.172
|
||||
allocated address 192.168.23.173
|
||||
allocated address 192.168.23.174
|
||||
allocated address 192.168.23.175
|
||||
allocated address 192.168.23.176
|
||||
allocated address 192.168.23.177
|
||||
allocated address 192.168.23.178
|
||||
allocated address 192.168.23.179
|
||||
allocated address 192.168.23.180
|
||||
allocated address 192.168.23.181
|
||||
allocated address 192.168.23.182
|
||||
allocated address 192.168.23.183
|
||||
allocated address 192.168.23.184
|
||||
allocated address 192.168.23.185
|
||||
allocated address 192.168.23.186
|
||||
allocated address 192.168.23.187
|
||||
allocated address 192.168.23.188
|
||||
allocated address 192.168.23.189
|
||||
allocated address 192.168.23.190
|
||||
allocated address 192.168.23.191
|
||||
allocated address 192.168.23.192
|
||||
allocated address 192.168.23.193
|
||||
allocated address 192.168.23.194
|
||||
allocated address 192.168.23.195
|
||||
allocated address 192.168.23.196
|
||||
allocated address 192.168.23.197
|
||||
allocated address 192.168.23.198
|
||||
allocated address 192.168.23.199
|
||||
allocated address 192.168.23.200
|
||||
allocated address 192.168.23.201
|
||||
allocated address 192.168.23.202
|
||||
allocated address 192.168.23.203
|
||||
allocated address 192.168.23.204
|
||||
allocated address 192.168.23.205
|
||||
allocated address 192.168.23.206
|
||||
allocated address 192.168.23.207
|
||||
allocated address 192.168.23.208
|
||||
allocated address 192.168.23.209
|
||||
allocated address 192.168.23.210
|
||||
allocated address 192.168.23.211
|
||||
allocated address 192.168.23.212
|
||||
allocated address 192.168.23.213
|
||||
allocated address 192.168.23.214
|
||||
allocated address 192.168.23.215
|
||||
allocated address 192.168.23.216
|
||||
allocated address 192.168.23.217
|
||||
allocated address 192.168.23.218
|
||||
allocated address 192.168.23.219
|
||||
allocated address 192.168.23.220
|
||||
allocated address 192.168.23.221
|
||||
allocated address 192.168.23.222
|
||||
allocated address 192.168.23.223
|
||||
allocated address 192.168.23.224
|
||||
allocated address 192.168.23.225
|
||||
allocated address 192.168.23.226
|
||||
allocated address 192.168.23.227
|
||||
allocated address 192.168.23.228
|
||||
allocated address 192.168.23.229
|
||||
allocated address 192.168.23.230
|
||||
allocated address 192.168.23.231
|
||||
allocated address 192.168.23.232
|
||||
allocated address 192.168.23.233
|
||||
allocated address 192.168.23.234
|
||||
allocated address 192.168.23.235
|
||||
allocated address 192.168.23.236
|
||||
allocated address 192.168.23.237
|
||||
allocated address 192.168.23.238
|
||||
allocated address 192.168.23.239
|
||||
allocated address 192.168.23.240
|
||||
allocated address 192.168.23.241
|
||||
allocated address 192.168.23.242
|
||||
allocated address 192.168.23.243
|
||||
allocated address 192.168.23.244
|
||||
allocated address 192.168.23.245
|
||||
allocated address 192.168.23.246
|
||||
allocated address 192.168.23.247
|
||||
allocated address 192.168.23.248
|
||||
allocated address 192.168.23.249
|
||||
allocated address 192.168.23.250
|
||||
allocated address 192.168.23.251
|
||||
allocated address 192.168.23.252
|
||||
allocated address 192.168.23.253
|
||||
allocated address 192.168.23.254
|
||||
|
|
|
|||
Loading…
Reference in New Issue