| /* |
| * 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 |
| |
| /* 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_NOIP6 |
| |
| #define IPPOOL_NONETWORK 0x01 |
| #define IPPOOL_NOBROADCAST 0x02 |
| #define IPPOOL_NOGATEWAY 0x04 |
| |
| #define IPPOOL_STATSIZE 0x10000 |
| |
| struct ippoolm_t; /* Forward declaration */ |
| |
| struct ippool_t { |
| int listsize; /* Total number of addresses */ |
| int allowdyn; /* Allow dynamic IP address allocation */ |
| int allowstat; /* Allow static IP address allocation */ |
| struct in_addr stataddr; /* Static address range network address */ |
| struct in_addr statmask; /* Static address range network mask */ |
| struct ippoolm_t *member; /* Listsize array of members */ |
| 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 dyanmic member */ |
| struct ippoolm_t *firststat; /* Pointer to first free static member */ |
| struct ippoolm_t *laststat; /* Pointer to last free static member */ |
| }; |
| |
| struct ippoolm_t { |
| #ifndef IPPOOL_NOIP6 |
| struct in6_addr addr; /* IP address of this member */ |
| #else |
| struct in_addr addr; /* IP address of this member */ |
| #endif |
| 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_hash4(struct in_addr *addr); |
| |
| /* Create new address pool */ |
| extern int ippool_new(struct ippool_t **this, char *dyn, char *stat, |
| int allowdyn, int allowstat, int flags); |
| |
| /* 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 in_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 in_addr *addr); |
| |
| /* 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 */ |
| extern int ippool_aton(struct in_addr *addr, struct in_addr *mask, |
| char *pool, int number); |
| |
| |
| #ifndef IPPOOL_NOIP6 |
| extern unsigned long int ippool_hash6(struct in6_addr *addr); |
| extern int ippool_getip6(struct ippool_t *this, struct in6_addr *addr); |
| extern int ippool_returnip6(struct ippool_t *this, struct in6_addr *addr); |
| #endif |
| |
| #endif /* !_IPPOOL_H */ |