106 lines
3.9 KiB
C
106 lines
3.9 KiB
C
/*
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* IP address pool functions.
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* Copyright (C) 2003, 2004 Mondru AB.
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*
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* The contents of this file may be used under the terms of the GNU
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* General Public License Version 2, provided that the above copyright
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* notice and this permission notice is included in all copies or
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* substantial portions of the software.
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*
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*/
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#ifndef _IPPOOL_H
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#define _IPPOOL_H
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/* Assuming that the address space is fragmented we need a hash table
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in order to return the addresses.
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The list pool should provide for both IPv4 and IPv6 addresses.
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When initialising a new address pool it should be possible to pass
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a string of CIDR format networks: "10.0.0.0/24 10.15.0.0/20" would
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translate to 256 addresses starting at 10.0.0.0 and 1024 addresses
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starting at 10.15.0.0.
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The above also applies to IPv6 which can be specified as described
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in RFC2373.
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*/
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#define IPPOOL_NOIP6
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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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struct ippoolm_t; /* Forward declaration */
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struct ippool_t {
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unsigned int listsize; /* Total number of addresses */
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int allowdyn; /* Allow dynamic IP address allocation */
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int allowstat; /* Allow static IP address allocation */
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struct in_addr stataddr; /* Static address range network address */
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struct in_addr statmask; /* Static address range network mask */
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struct ippoolm_t *member; /* Listsize array of members */
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unsigned int hashsize; /* Size of hash table */
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int hashlog; /* Log2 size of hash table */
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int hashmask; /* Bitmask for calculating hash */
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struct ippoolm_t **hash; /* Hashsize array of pointer to member */
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struct ippoolm_t *firstdyn; /* Pointer to first free dynamic member */
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struct ippoolm_t *lastdyn; /* Pointer to last free dynamic member */
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struct ippoolm_t *firststat; /* Pointer to first free static member */
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struct ippoolm_t *laststat; /* Pointer to last free static member */
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};
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struct ippoolm_t {
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#ifndef IPPOOL_NOIP6
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struct in6_addr addr; /* IP address of this member */
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#else
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struct in_addr addr; /* IP address of this member */
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#endif
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int inuse; /* 0=available; 1= dynamic; 2 = static */
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struct ippoolm_t *nexthash; /* Linked list part of hash table */
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struct ippoolm_t *prev, *next; /* Linked list of free dynamic or static */
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void *peer; /* Pointer to peer protocol handler */
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};
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/* The above structures require approximately 20+4 = 24 bytes for
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each address (IPv4). For IPv6 the corresponding value is 32+4 = 36
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bytes for each address. */
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/* Hash an IP address using code based on Bob Jenkins lookupa */
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extern unsigned long int ippool_hash4(struct in_addr *addr);
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/* Create new address pool */
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extern int ippool_new(struct ippool_t **this, char *dyn, char *stat,
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int allowdyn, int allowstat, int flags);
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/* Delete existing address pool */
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extern int ippool_free(struct ippool_t *this);
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/* Find an IP address in the pool */
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extern int ippool_getip(struct ippool_t *this, struct ippoolm_t **member,
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struct in_addr *addr);
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/* Get an IP address. If addr = 0.0.0.0 get a dynamic IP address. Otherwise
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check to see if the given address is available */
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extern int ippool_newip(struct ippool_t *this, struct ippoolm_t **member,
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struct in_addr *addr, int statip);
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/* Return a previously allocated IP address */
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extern int ippool_freeip(struct ippool_t *this, struct ippoolm_t *member);
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/* Get net and mask based on ascii string */
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extern int ippool_aton(struct in_addr *addr, struct in_addr *mask,
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char *pool, int number);
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#ifndef IPPOOL_NOIP6
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extern unsigned long int ippool_hash6(struct in6_addr *addr);
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extern int ippool_getip6(struct ippool_t *this, struct in6_addr *addr);
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extern int ippool_returnip6(struct ippool_t *this, struct in6_addr *addr);
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#endif
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#endif /* !_IPPOOL_H */
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