/* * * Connection Manager * * Copyright (C) 2007-2012 Intel Corporation. All rights reserved. * Copyright (C) 2012 BMW Car IT GmbH. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * */ #ifdef HAVE_CONFIG_H #include #endif #include #include #include #include #include #include #include #include "connman.h" struct connman_ippool { unsigned int refcount; uint32_t block; char *gateway; char *broadcast; char *start_ip; char *end_ip; char *subnet_mask; }; static GHashTable *hash_pool; static uint32_t last_block; static uint32_t block_16_bits; static uint32_t block_20_bits; static uint32_t block_24_bits; static uint32_t subnet_mask_24; struct connman_ippool * __connman_ippool_ref_debug(struct connman_ippool *pool, const char *file, int line, const char *caller) { DBG("%p ref %d by %s:%d:%s()", pool, pool->refcount + 1, file, line, caller); __sync_fetch_and_add(&pool->refcount, 1); return pool; } void __connman_ippool_unref_debug(struct connman_ippool *pool, const char *file, int line, const char *caller) { if (pool == NULL) return; DBG("%p ref %d by %s:%d:%s()", pool, pool->refcount - 1, file, line, caller); if (__sync_fetch_and_sub(&pool->refcount, 1) != 1) return; g_hash_table_remove(hash_pool, GUINT_TO_POINTER(pool->block)); } static char *get_ip(uint32_t ip) { struct in_addr addr; addr.s_addr = htonl(ip); return g_strdup(inet_ntoa(addr)); } static uint32_t next_block(uint32_t block) { uint32_t next; /* * Return the next IP block within the private IP range * * 16-bit block 192.168.0.0 – 192.168.255.255 * 20-bit block 172.16.0.0 – 172.31.255.255 * 24-bit block 10.0.0.0 – 10.255.255.255 */ next = (block & 0x0000ff00) >> 8; next += 1; if (next == 255) { if ((block & 0xffffff00) == block_16_bits) { /* * Reached the end of the 16 bit block, switch * to the 20-bit block. */ return block_20_bits; } if ((block & 0xffff0000) >= block_20_bits) { next = (block & 0x00ff0000) >> 16; if (next >= 16 && next < 32) next += 1; if (next == 32) { /* * Reached the end of the 20 bit * block, switch to the 24-bit block. */ return block_24_bits; } return (block & 0xff000000) | ((next << 16) & 0x00ff0000); } if ((block & 0xff000000) == block_24_bits) { next = (block & 0x00ff0000) >> 16; if (next < 255) next += 1; if (next == 255) { /* * Reached the end of the 24 bit * block, switch to the 16-bit block. */ return block_16_bits; } return (block & 0xff000000) | ((next << 16) & 0x00ff0000); } } return (block & 0xffff0000) | ((next << 8) & 0x0000ff00); } static uint32_t find_free_block() { struct connman_ippool *pool; uint32_t start; uint32_t block; if (last_block == 0) return block_16_bits; /* * Instead starting always from the 16 bit block, we start * from the last assigned block. This is a simple optimimazion * for the case where a lot of blocks have been assigned, e.g. * the first half of the private IP pool is in use and a new * we need to find a new block. * * To only thing we have to make sure is that we terminated if * there is no block left. */ start = last_block; block = next_block(start); while (start != block) { block = next_block(block); pool = g_hash_table_lookup(hash_pool, GUINT_TO_POINTER(block)); if (pool != NULL) continue; return block; } return 0; } struct connman_ippool *__connman_ippool_create(unsigned int start, unsigned int range) { struct connman_ippool *pool; uint32_t block; /* * The range is at max 255 and we don't support overlapping * blocks. */ if (start + range > 254) return NULL; block = find_free_block(); if (block == 0) return NULL; pool = g_try_new0(struct connman_ippool, 1); if (pool == NULL) return NULL; pool->refcount = 1; pool->block = block; last_block = block; if (range == 0) range = 1; pool->gateway = get_ip(block + 1); pool->broadcast = get_ip(block + 255); pool->subnet_mask = get_ip(subnet_mask_24); pool->start_ip = get_ip(block + start); pool->end_ip = get_ip(block + start + range); g_hash_table_insert(hash_pool, GUINT_TO_POINTER(pool->block), pool); return pool; } const char *__connman_ippool_get_gateway(struct connman_ippool *pool) { return pool->gateway; } const char *__connman_ippool_get_broadcast(struct connman_ippool *pool) { return pool->broadcast; } const char *__connman_ippool_get_start_ip(struct connman_ippool *pool) { return pool->start_ip; } const char *__connman_ippool_get_end_ip(struct connman_ippool *pool) { return pool->end_ip; } const char *__connman_ippool_get_subnet_mask(struct connman_ippool *pool) { return pool->subnet_mask; } static void pool_free(gpointer data) { struct connman_ippool *pool = data; g_free(pool->gateway); g_free(pool->broadcast); g_free(pool->start_ip); g_free(pool->end_ip); g_free(pool->subnet_mask); g_free(pool); } int __connman_ippool_init(void) { DBG(""); /* We start at 254 by default to avoid common addresses */ block_16_bits = ntohl(inet_addr("192.168.254.0")); block_20_bits = ntohl(inet_addr("172.16.0.0")); block_24_bits = ntohl(inet_addr("10.0.0.0")); subnet_mask_24 = ntohl(inet_addr("255.255.255.0")); hash_pool = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, pool_free); return 0; } void __connman_ippool_cleanup(void) { DBG(""); g_hash_table_destroy(hash_pool); hash_pool = NULL; }