/* * IP address pool functions. * Copyright (C) 2003, 2004 Mondru AB. * * The contents of this file may be used under the terms of the GNU * General Public License Version 2, provided that the above copyright * notice and this permission notice is included in all copies or * substantial portions of the software. * */ #ifndef _IPPOOL_H #define _IPPOOL_H #include "../lib/in46_addr.h" #include /* Assuming that the address space is fragmented we need a hash table in order to return the addresses. The list pool should provide for both IPv4 and IPv6 addresses. When initialising a new address pool it should be possible to pass a string of CIDR format networks: "10.0.0.0/24 10.15.0.0/20" would translate to 256 addresses starting at 10.0.0.0 and 1024 addresses starting at 10.15.0.0. The above also applies to IPv6 which can be specified as described in RFC2373. */ #define IPPOOL_NONETWORK 0x01 #define IPPOOL_NOBROADCAST 0x02 #define IPPOOL_STATSIZE 0x10000 struct ippoolm_t; /* Forward declaration */ struct ippool_t { unsigned int listsize; /* Total number of addresses */ int allowdyn; /* Allow dynamic IP address allocation */ int allowstat; /* Allow static IP address allocation */ struct in46_addr stataddr; /* Static address range network address */ size_t stataddrprefixlen; /* IPv6 prefix length of stataddr */ struct ippoolm_t *member; /* Listsize array of members */ unsigned int hashsize; /* Size of hash table */ int hashlog; /* Log2 size of hash table */ int hashmask; /* Bitmask for calculating hash */ struct ippoolm_t **hash; /* Hashsize array of pointer to member */ struct ippoolm_t *firstdyn; /* Pointer to first free dynamic member */ struct ippoolm_t *lastdyn; /* Pointer to last free dynamic member */ struct ippoolm_t *firststat; /* Pointer to first free static member */ struct ippoolm_t *laststat; /* Pointer to last free static member */ }; struct ippoolm_t { struct in46_addr addr; /* IP address of this member */ struct ippool_t *pool; /* Pool to which we belong */ int inuse; /* 0=available; 1= dynamic; 2 = static */ struct ippoolm_t *nexthash; /* Linked list part of hash table */ struct ippoolm_t *prev, *next; /* Linked list of free dynamic or static */ void *peer; /* Pointer to peer protocol handler */ }; /* The above structures require approximately 20+4 = 24 bytes for each address (IPv4). For IPv6 the corresponding value is 32+4 = 36 bytes for each address. */ /* Hash an IP address using code based on Bob Jenkins lookupa */ extern unsigned long int ippool_hash(struct in46_addr *addr); /* Create new address pool */ extern int ippool_new(struct ippool_t **this, const struct in46_prefix *dyn, const struct in46_prefix *stat, int flags, struct in46_prefix *blacklist, size_t blacklist_size); /* Delete existing address pool */ extern int ippool_free(struct ippool_t *this); /* Find an IP address in the pool */ extern int ippool_getip(struct ippool_t *this, struct ippoolm_t **member, struct in46_addr *addr); /* Get an IP address. If addr = 0.0.0.0 get a dynamic IP address. Otherwise check to see if the given address is available */ extern int ippool_newip(struct ippool_t *this, struct ippoolm_t **member, struct in46_addr *addr, int statip); /* Return a previously allocated IP address */ extern int ippool_freeip(struct ippool_t *this, struct ippoolm_t *member); /* Get net and mask based on ascii string */ int ippool_aton(struct in46_addr *addr, size_t *prefixlen, const char *pool, int number); /* Increase IPv4/IPv6 address by 1 */ extern void in46a_inc(struct in46_addr *addr); #endif /* !_IPPOOL_H */