lib/ip.h

   1 /*
   2  *      BIRD Internet Routing Daemon -- The Internet Protocol
   3  *
   4  *      (c) 1998 Martin Mares <mj@ucw.cz>
   5  *
   6  *      Can be freely distributed and used under the terms of the GNU GPL.
   7  */
   8
   9 #ifndef _BIRD_IP_H_
  10 #define _BIRD_IP_H_
  11
  12 #ifndef IPV6
  13 #include "ipv4.h"
  14 #else
  15 #include "ipv6.h"
  16 #endif
  17
  18 #define ipa_zero(x) (!ipa_nonzero(x))
  19 #define ip_is_prefix(a,l) (!ipa_nonzero(ipa_and(a, ipa_not(ipa_mkmask(l)))))
  20 #define ipa_in_net(x,n,p) (ipa_zero(ipa_and(ipa_xor((n),(x)),ipa_mkmask(p))))
  21 #define net_in_net(n1,l1,n2,l2) (((l1) >= (l2)) && (ipa_zero(ipa_and(ipa_xor((n1),(n2)),ipa_mkmask(l2)))))
  22
  23 /*
  24  *      ip_classify() returns either a negative number for invalid addresses
  25  *      or scope OR'ed together with address type.
  26  */
  27
  28 #define IADDR_INVALID           -1
  29 #define IADDR_SCOPE_MASK        0xfff
  30 #define IADDR_HOST              0x1000
  31 #define IADDR_BROADCAST         0x2000
  32 #define IADDR_MULTICAST         0x4000
  33
  34 /*
  35  *      Address scope
  36  */
  37
  38 #define SCOPE_HOST 0
  39 #define SCOPE_LINK 1
  40 #define SCOPE_SITE 2
  41 #define SCOPE_ORGANIZATION 3
  42 #define SCOPE_UNIVERSE 4
  43 #define SCOPE_UNDEFINED 5
  44
  45 char *ip_scope_text(unsigned);
  46
  47 /*
  48  *      Network prefixes
  49  */
  50
  51 struct prefix {
  52   ip_addr addr;
  53   unsigned int len;
  54 };
  55
  56 static inline int ipa_classify_net(ip_addr a)
  57 { return ipa_zero(a) ? (IADDR_HOST | SCOPE_UNIVERSE) : ipa_classify(a); }
  58
  59 /*
  60  *      Conversions between internal and string representation
  61  */
  62
  63 char *ip_ntop(ip_addr a, char *);
  64 char *ip_ntox(ip_addr a, char *);
  65 int ip_pton(char *a, ip_addr *o);
  66
  67 #endif