ippool: Implement and use blacklist instead of blindly using IPPOOL_NOGATEWAY
Commit dda21ed7d4a897c9284c69175d0da598598eae40 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
diff --git a/tests/lib/ippool_test.c b/tests/lib/ippool_test.c
index f38c1be..ea56edd 100644
--- a/tests/lib/ippool_test.c
+++ b/tests/lib/ippool_test.c
@@ -13,36 +13,47 @@
#include "../../lib/syserr.h"
-static struct ippool_t *create_pool(const char *prefix_str, unsigned int flags)
+static struct ippool_t *create_pool(const char *prefix_str, unsigned int flags, char **blacklist, size_t blacklist_size)
{
+ struct in46_prefix *blacklist_pfx;
struct ippool_t *pool;
struct in46_prefix pfx;
size_t t;
int rc;
+ int i;
+
+ blacklist_pfx = calloc(blacklist_size, sizeof(struct in46_prefix));
+ for (i = 0; i < blacklist_size; i++) {
+ rc = ippool_aton(&blacklist_pfx[i].addr, &t, blacklist[i], 0);
+ OSMO_ASSERT(rc == 0);
+ pfx.prefixlen = t;
+ }
/* dynamic-only v4 */
- rc = ippool_aton(&pfx.addr, &t, prefix_str, flags);
+ rc = ippool_aton(&pfx.addr, &t, prefix_str, 0);
OSMO_ASSERT(rc == 0);
pfx.prefixlen = t;
- rc = ippool_new(&pool, &pfx, NULL, flags);
+ rc = ippool_new(&pool, &pfx, NULL, flags, blacklist_pfx, blacklist_size);
OSMO_ASSERT(rc == 0);
//ippool_printaddr(pool);
+ free(blacklist_pfx);
+
return pool;
}
-static void test_pool_size(const char *pfx, unsigned int flags, unsigned int expected_size)
+static void test_pool_size(const char *pfx, unsigned int flags, char **blacklist, size_t blacklist_size, unsigned int expected_size)
{
struct ippool_t *pool;
struct ippoolm_t *member;
struct in46_addr addr;
int i, rc, n;
- printf("testing pool for prefix %s, flags=0x%x, expected_size=%u\n", pfx, flags, expected_size);
- pool = create_pool(pfx, flags);
+ printf("testing pool for prefix %s, flags=0x%x, blacklist_size=%lu, expected_size=%u\n", pfx, flags, blacklist_size, expected_size);
+ pool = create_pool(pfx, flags, blacklist, blacklist_size);
OSMO_ASSERT(pool->listsize == expected_size);
memset(&addr, 0, sizeof(addr));
@@ -91,19 +102,23 @@
static void test_pool_sizes(void)
{
/* 256 addresses [0..255] */
- test_pool_size("192.168.23.0/24", 0, 256);
+ test_pool_size("192.168.23.0/24", 0, NULL, 0, 256);
/* 255 addresses [1..255] */
- test_pool_size("192.168.23.0/24", IPPOOL_NONETWORK, 255);
+ test_pool_size("192.168.23.0/24", IPPOOL_NONETWORK, NULL, 0, 255);
/* 254 addresses [1..254] */
- test_pool_size("192.168.23.0/24", IPPOOL_NONETWORK | IPPOOL_NOBROADCAST, 254);
+ test_pool_size("192.168.23.0/24", IPPOOL_NONETWORK | IPPOOL_NOBROADCAST, NULL, 0, 254);
/* 65534 addresses [0.1..255.254] */
- test_pool_size("192.168.0.0/16", IPPOOL_NONETWORK | IPPOOL_NOBROADCAST, 65534);
+ test_pool_size("192.168.0.0/16", IPPOOL_NONETWORK | IPPOOL_NOBROADCAST, NULL, 0, 65534);
/* 256 prefixes of /64 each */
- test_pool_size("2001:DB8::/56", 0, 256);
+ test_pool_size("2001:DB8::/56", 0, NULL, 0, 256);
+
+ /* 253 addresses [1..254] & exclude 192.168.23.1/24 */
+ char *blacklist[] = {"176.16.222.10/24", "192.168.23.1/24", "192.168.38.2/24"};
+ test_pool_size("192.168.23.0/24", IPPOOL_NONETWORK | IPPOOL_NOBROADCAST, blacklist, 3, 253);
}
int main(int argc, char **argv)