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Annotation of embedaddon/coova-chilli/src/ippool.h, revision 1.1.1.1

1.1       misho       1: /* 
                      2:  *
                      3:  * IP address pool functions.
                      4:  * Copyright (C) 2003, 2004 Mondru AB.
                      5:  * Copyright (c) 2006-2007 David Bird <david@coova.com>
                      6:  * 
                      7:  * The contents of this file may be used under the terms of the GNU
                      8:  * General Public License Version 2, provided that the above copyright
                      9:  * notice and this permission notice is included in all copies or
                     10:  * substantial portions of the software.
                     11:  * 
                     12:  */
                     13: 
                     14: #ifndef _IPPOOL_H
                     15: #define _IPPOOL_H
                     16: 
                     17: /* Assuming that the address space is fragmented we need a hash table
                     18:    in order to return the addresses.
                     19: 
                     20:    The list pool should provide for both IPv4 and IPv6 addresses.
                     21: 
                     22:    When initialising a new address pool it should be possible to pass
                     23:    a string of CIDR format networks: "10.0.0.0/24 10.15.0.0/20" would
                     24:    translate to 256 addresses starting at 10.0.0.0 and 1024 addresses
                     25:    starting at 10.15.0.0. 
                     26: 
                     27:    The above also applies to IPv6 which can be specified as described
                     28:    in RFC2373.
                     29: */
                     30: 
                     31: #define IPPOOL_NOIP6
                     32: 
                     33: #include "system.h"
                     34: 
                     35: struct ippoolm_t;                /* Forward declaration */
                     36: 
                     37: struct ippool_t {
                     38:   int listsize;                  /* Total number of addresses */
                     39:   int allowdyn;                  /* Allow dynamic IP address allocation */
                     40:   int allowstat;                 /* Allow static IP address allocation */
                     41:   struct in_addr stataddr;       /* Static address range network address */
                     42:   struct in_addr statmask;       /* Static address range network mask */
                     43:   struct ippoolm_t *member;      /* Listsize array of members */
                     44:   int hashsize;                  /* Size of hash table */
                     45:   int hashlog;                   /* Log2 size of hash table */
                     46:   int hashmask;                  /* Bitmask for calculating hash */
                     47:   struct ippoolm_t **hash;       /* Hashsize array of pointer to member */
                     48:   struct ippoolm_t *firstdyn;    /* Pointer to first free dynamic member */
                     49:   struct ippoolm_t *lastdyn;     /* Pointer to last free dynamic member */
                     50:   struct ippoolm_t *firststat;   /* Pointer to first free static member */
                     51:   struct ippoolm_t *laststat;    /* Pointer to last free static member */
                     52: };
                     53: 
                     54: struct ippoolm_t {
                     55: #ifndef IPPOOL_NOIP6
                     56:   struct in6_addr addr;          /* IP address of this member */
                     57: #else
                     58:   struct in_addr addr;           /* IP address of this member */
                     59: #endif
                     60:   int inuse;                     /* 0=available; 1= dynamic; 2 = static */
                     61:   struct ippoolm_t *nexthash;    /* Linked list part of hash table */
                     62:   struct ippoolm_t *prev, *next; /* Linked list of free dynamic or static */
                     63:   void *peer;                    /* Pointer to peer protocol handler */
                     64: };
                     65: 
                     66: /* The above structures require approximately 20+4 = 24 bytes for
                     67:    each address (IPv4). For IPv6 the corresponding value is 32+4 = 36
                     68:    bytes for each address. */
                     69: 
                     70: /* Hash an IP address using code based on Bob Jenkins lookupa */
                     71: extern uint32_t ippool_hash4(struct in_addr *addr);
                     72: 
                     73: /* Create new address pool */
                     74: extern int ippool_new(struct ippool_t **this, 
                     75:                      char *dyn, int start, int end, 
                     76:                      char *stat, int allowdyn, int allowstat);
                     77: 
                     78: /* Delete existing address pool */
                     79: extern int ippool_free(struct ippool_t *this);
                     80: 
                     81: /* Find an IP address in the pool */
                     82: extern int ippool_getip(struct ippool_t *this, struct ippoolm_t **member,
                     83:                 struct in_addr *addr);
                     84: 
                     85: /* Get an IP address. If addr = 0.0.0.0 get a dynamic IP address. Otherwise
                     86:    check to see if the given address is available */
                     87: extern int ippool_newip(struct ippool_t *this, struct ippoolm_t **member,
                     88:                        struct in_addr *addr, int statip);
                     89: 
                     90: /* Return a previously allocated IP address */
                     91: extern int ippool_freeip(struct ippool_t *this, struct ippoolm_t *member);
                     92: 
                     93: /* Get net and mask based on ascii string */
                     94: extern int ippool_aton(struct in_addr *addr, struct in_addr *mask,
                     95:                       char *pool, int number);
                     96: 
                     97: int ippool_hashadd(struct ippool_t *this, struct ippoolm_t *member);
                     98: 
                     99: #ifndef IPPOOL_NOIP6
                    100: extern uint32_t ippool_hash6(struct in6_addr *addr);
                    101: extern int ippool_getip6(struct ippool_t *this, struct in6_addr *addr);
                    102: extern int ippool_returnip6(struct ippool_t *this, struct in6_addr *addr);
                    103: #endif
                    104: 
                    105: #endif /* !_IPPOOL_H */