src/basic/in-addr-util.h

   1 #pragma once
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2014 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <netinet/in.h>
  23 #include <stddef.h>
  24 #include <sys/socket.h>
  25
  26 #include "macro.h"
  27 #include "util.h"
  28
  29 union in_addr_union {
  30         struct in_addr in;
  31         struct in6_addr in6;
  32 };
  33
  34 struct in_addr_data {
  35         int family;
  36         union in_addr_union address;
  37 };
  38
  39 bool in4_addr_is_null(const struct in_addr *a);
  40 int in_addr_is_null(int family, const union in_addr_union *u);
  41
  42 int in_addr_is_multicast(int family, const union in_addr_union *u);
  43
  44 bool in4_addr_is_link_local(const struct in_addr *a);
  45 int in_addr_is_link_local(int family, const union in_addr_union *u);
  46
  47 bool in4_addr_is_localhost(const struct in_addr *a);
  48 int in_addr_is_localhost(int family, const union in_addr_union *u);
  49
  50 int in_addr_equal(int family, const union in_addr_union *a, const union in_addr_union *b);
  51 int in_addr_prefix_intersect(int family, const union in_addr_union *a, unsigned aprefixlen, const union in_addr_union *b, unsigned bprefixlen);
  52 int in_addr_prefix_next(int family, union in_addr_union *u, unsigned prefixlen);
  53 int in_addr_to_string(int family, const union in_addr_union *u, char **ret);
  54 int in_addr_ifindex_to_string(int family, const union in_addr_union *u, int ifindex, char **ret);
  55 int in_addr_from_string(int family, const char *s, union in_addr_union *ret);
  56 int in_addr_from_string_auto(const char *s, int *family, union in_addr_union *ret);
  57 int in_addr_ifindex_from_string_auto(const char *s, int *family, union in_addr_union *ret, int *ifindex);
  58 unsigned char in_addr_netmask_to_prefixlen(const struct in_addr *addr);
  59 struct in_addr* in_addr_prefixlen_to_netmask(struct in_addr *addr, unsigned char prefixlen);
  60 int in_addr_default_prefixlen(const struct in_addr *addr, unsigned char *prefixlen);
  61 int in_addr_default_subnet_mask(const struct in_addr *addr, struct in_addr *mask);
  62 int in_addr_mask(int family, union in_addr_union *addr, unsigned char prefixlen);
  63 int in_addr_prefix_from_string(const char *p, int family, union in_addr_union *ret_prefix, uint8_t *ret_prefixlen);
  64
  65 static inline size_t FAMILY_ADDRESS_SIZE(int family) {
  66         assert(family == AF_INET || family == AF_INET6);
  67         return family == AF_INET6 ? 16 : 4;
  68 }
  69
  70 #define IN_ADDR_NULL ((union in_addr_union) {})