-/***
- This file is part of systemd.
-
- Copyright 2014 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
+/* SPDX-License-Identifier: LGPL-2.1+ */
#include <arpa/inet.h>
#include <endian.h>
#include <errno.h>
+#include <net/if.h>
#include <stdint.h>
#include <stdlib.h>
#include "alloc-util.h"
#include "in-addr-util.h"
#include "macro.h"
+#include "parse-util.h"
#include "util.h"
bool in4_addr_is_null(const struct in_addr *a) {
- return a->s_addr == 0;
-}
+ assert(a);
-bool in6_addr_is_null(const struct in6_addr *a) {
- return
- a->s6_addr32[0] == 0 &&
- a->s6_addr32[1] == 0 &&
- a->s6_addr32[2] == 0 &&
- a->s6_addr32[3] == 0;
+ return a->s_addr == 0;
}
int in_addr_is_null(int family, const union in_addr_union *u) {
return in4_addr_is_null(&u->in);
if (family == AF_INET6)
- return in6_addr_is_null(&u->in6);
+ return IN6_IS_ADDR_UNSPECIFIED(&u->in6);
return -EAFNOSUPPORT;
}
+bool in4_addr_is_link_local(const struct in_addr *a) {
+ assert(a);
+
+ return (be32toh(a->s_addr) & UINT32_C(0xFFFF0000)) == (UINT32_C(169) << 24 | UINT32_C(254) << 16);
+}
+
int in_addr_is_link_local(int family, const union in_addr_union *u) {
assert(u);
if (family == AF_INET)
- return (be32toh(u->in.s_addr) & UINT32_C(0xFFFF0000)) == (UINT32_C(169) << 24 | UINT32_C(254) << 16);
+ return in4_addr_is_link_local(&u->in);
if (family == AF_INET6)
return IN6_IS_ADDR_LINKLOCAL(&u->in6);
return -EAFNOSUPPORT;
}
+int in_addr_is_multicast(int family, const union in_addr_union *u) {
+ assert(u);
+
+ if (family == AF_INET)
+ return IN_MULTICAST(be32toh(u->in.s_addr));
+
+ if (family == AF_INET6)
+ return IN6_IS_ADDR_MULTICAST(&u->in6);
+
+ return -EAFNOSUPPORT;
+}
+
+bool in4_addr_is_localhost(const struct in_addr *a) {
+ assert(a);
+
+ /* All of 127.x.x.x is localhost. */
+ return (be32toh(a->s_addr) & UINT32_C(0xFF000000)) == UINT32_C(127) << 24;
+}
+
int in_addr_is_localhost(int family, const union in_addr_union *u) {
assert(u);
if (family == AF_INET)
- /* All of 127.x.x.x is localhost. */
- return (be32toh(u->in.s_addr) & UINT32_C(0xFF000000)) == UINT32_C(127) << 24;
+ return in4_addr_is_localhost(&u->in);
if (family == AF_INET6)
return IN6_IS_ADDR_LOOPBACK(&u->in6);
return 0;
}
-int in_addr_from_string(int family, const char *s, union in_addr_union *ret) {
+int in_addr_ifindex_to_string(int family, const union in_addr_union *u, int ifindex, char **ret) {
+ size_t l;
+ char *x;
+ int r;
- assert(s);
+ assert(u);
assert(ret);
+ /* Much like in_addr_to_string(), but optionally appends the zone interface index to the address, to properly
+ * handle IPv6 link-local addresses. */
+
+ if (family != AF_INET6)
+ goto fallback;
+ if (ifindex <= 0)
+ goto fallback;
+
+ r = in_addr_is_link_local(family, u);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ goto fallback;
+
+ l = INET6_ADDRSTRLEN + 1 + DECIMAL_STR_MAX(ifindex) + 1;
+ x = new(char, l);
+ if (!x)
+ return -ENOMEM;
+
+ errno = 0;
+ if (!inet_ntop(family, u, x, l)) {
+ free(x);
+ return errno > 0 ? -errno : -EINVAL;
+ }
+
+ sprintf(strchr(x, 0), "%%%i", ifindex);
+ *ret = x;
+
+ return 0;
+
+fallback:
+ return in_addr_to_string(family, u, ret);
+}
+
+int in_addr_from_string(int family, const char *s, union in_addr_union *ret) {
+ union in_addr_union buffer;
+ assert(s);
+
if (!IN_SET(family, AF_INET, AF_INET6))
return -EAFNOSUPPORT;
errno = 0;
- if (inet_pton(family, s, ret) <= 0)
+ if (inet_pton(family, s, ret ?: &buffer) <= 0)
return errno > 0 ? -errno : -EINVAL;
return 0;
}
-int in_addr_from_string_auto(const char *s, int *family, union in_addr_union *ret) {
+int in_addr_from_string_auto(const char *s, int *ret_family, union in_addr_union *ret) {
int r;
assert(s);
- assert(family);
- assert(ret);
r = in_addr_from_string(AF_INET, s, ret);
if (r >= 0) {
- *family = AF_INET;
+ if (ret_family)
+ *ret_family = AF_INET;
return 0;
}
r = in_addr_from_string(AF_INET6, s, ret);
if (r >= 0) {
- *family = AF_INET6;
+ if (ret_family)
+ *ret_family = AF_INET6;
return 0;
}
return -EINVAL;
}
-unsigned char in_addr_netmask_to_prefixlen(const struct in_addr *addr) {
+int in_addr_ifindex_from_string_auto(const char *s, int *family, union in_addr_union *ret, int *ifindex) {
+ const char *suffix;
+ int r, ifi = 0;
+
+ assert(s);
+ assert(family);
+ assert(ret);
+
+ /* Similar to in_addr_from_string_auto() but also parses an optionally appended IPv6 zone suffix ("scope id")
+ * if one is found. */
+
+ suffix = strchr(s, '%');
+ if (suffix) {
+
+ if (ifindex) {
+ /* If we shall return the interface index, try to parse it */
+ r = parse_ifindex(suffix + 1, &ifi);
+ if (r < 0) {
+ unsigned u;
+
+ u = if_nametoindex(suffix + 1);
+ if (u <= 0)
+ return -errno;
+
+ ifi = (int) u;
+ }
+ }
+
+ s = strndupa(s, suffix - s);
+ }
+
+ r = in_addr_from_string_auto(s, family, ret);
+ if (r < 0)
+ return r;
+
+ if (ifindex)
+ *ifindex = ifi;
+
+ return r;
+}
+
+unsigned char in4_addr_netmask_to_prefixlen(const struct in_addr *addr) {
assert(addr);
return 32 - u32ctz(be32toh(addr->s_addr));
}
-struct in_addr* in_addr_prefixlen_to_netmask(struct in_addr *addr, unsigned char prefixlen) {
+struct in_addr* in4_addr_prefixlen_to_netmask(struct in_addr *addr, unsigned char prefixlen) {
assert(addr);
assert(prefixlen <= 32);
return addr;
}
-int in_addr_default_prefixlen(const struct in_addr *addr, unsigned char *prefixlen) {
+int in4_addr_default_prefixlen(const struct in_addr *addr, unsigned char *prefixlen) {
uint8_t msb_octet = *(uint8_t*) addr;
/* addr may not be aligned, so make sure we only access it byte-wise */
return 0;
}
-int in_addr_default_subnet_mask(const struct in_addr *addr, struct in_addr *mask) {
+int in4_addr_default_subnet_mask(const struct in_addr *addr, struct in_addr *mask) {
unsigned char prefixlen;
int r;
assert(addr);
assert(mask);
- r = in_addr_default_prefixlen(addr, &prefixlen);
+ r = in4_addr_default_prefixlen(addr, &prefixlen);
if (r < 0)
return r;
- in_addr_prefixlen_to_netmask(mask, prefixlen);
+ in4_addr_prefixlen_to_netmask(mask, prefixlen);
return 0;
}
if (family == AF_INET) {
struct in_addr mask;
- if (!in_addr_prefixlen_to_netmask(&mask, prefixlen))
+ if (!in4_addr_prefixlen_to_netmask(&mask, prefixlen))
return -EINVAL;
addr->in.s_addr &= mask.s_addr;
return -EAFNOSUPPORT;
}
+
+int in_addr_prefix_covers(int family,
+ const union in_addr_union *prefix,
+ unsigned char prefixlen,
+ const union in_addr_union *address) {
+
+ union in_addr_union masked_prefix, masked_address;
+ int r;
+
+ assert(prefix);
+ assert(address);
+
+ masked_prefix = *prefix;
+ r = in_addr_mask(family, &masked_prefix, prefixlen);
+ if (r < 0)
+ return r;
+
+ masked_address = *address;
+ r = in_addr_mask(family, &masked_address, prefixlen);
+ if (r < 0)
+ return r;
+
+ return in_addr_equal(family, &masked_prefix, &masked_address);
+}
+
+int in_addr_parse_prefixlen(int family, const char *p, unsigned char *ret) {
+ uint8_t u;
+ int r;
+
+ if (!IN_SET(family, AF_INET, AF_INET6))
+ return -EAFNOSUPPORT;
+
+ r = safe_atou8(p, &u);
+ if (r < 0)
+ return r;
+
+ if (u > FAMILY_ADDRESS_SIZE(family) * 8)
+ return -ERANGE;
+
+ *ret = u;
+ return 0;
+}
+
+int in_addr_prefix_from_string(
+ const char *p,
+ int family,
+ union in_addr_union *ret_prefix,
+ unsigned char *ret_prefixlen) {
+
+ union in_addr_union buffer;
+ const char *e, *l;
+ unsigned char k;
+ int r;
+
+ assert(p);
+
+ if (!IN_SET(family, AF_INET, AF_INET6))
+ return -EAFNOSUPPORT;
+
+ e = strchr(p, '/');
+ if (e)
+ l = strndupa(p, e - p);
+ else
+ l = p;
+
+ r = in_addr_from_string(family, l, &buffer);
+ if (r < 0)
+ return r;
+
+ if (e) {
+ r = in_addr_parse_prefixlen(family, e+1, &k);
+ if (r < 0)
+ return r;
+ } else
+ k = FAMILY_ADDRESS_SIZE(family) * 8;
+
+ if (ret_prefix)
+ *ret_prefix = buffer;
+ if (ret_prefixlen)
+ *ret_prefixlen = k;
+
+ return 0;
+}
+
+int in_addr_prefix_from_string_auto(
+ const char *p,
+ int *ret_family,
+ union in_addr_union *ret_prefix,
+ unsigned char *ret_prefixlen) {
+
+ union in_addr_union buffer;
+ const char *e, *l;
+ unsigned char k;
+ int family, r;
+
+ assert(p);
+
+ e = strchr(p, '/');
+ if (e)
+ l = strndupa(p, e - p);
+ else
+ l = p;
+
+ r = in_addr_from_string_auto(l, &family, &buffer);
+ if (r < 0)
+ return r;
+
+ if (e) {
+ r = in_addr_parse_prefixlen(family, e+1, &k);
+ if (r < 0)
+ return r;
+ } else
+ k = FAMILY_ADDRESS_SIZE(family) * 8;
+
+ if (ret_family)
+ *ret_family = family;
+ if (ret_prefix)
+ *ret_prefix = buffer;
+ if (ret_prefixlen)
+ *ret_prefixlen = k;
+
+ return 0;
+
+}
+
+void in_addr_data_hash_func(const void *p, struct siphash *state) {
+ const struct in_addr_data *a = p;
+
+ siphash24_compress(&a->family, sizeof(a->family), state);
+ siphash24_compress(&a->address, FAMILY_ADDRESS_SIZE(a->family), state);
+}
+
+int in_addr_data_compare_func(const void *a, const void *b) {
+ const struct in_addr_data *x = a, *y = b;
+ int r;
+
+ r = CMP(x->family, y->family);
+ if (r != 0)
+ return r;
+
+ return memcmp(&x->address, &y->address, FAMILY_ADDRESS_SIZE(x->family));
+}
+
+const struct hash_ops in_addr_data_hash_ops = {
+ .hash = in_addr_data_hash_func,
+ .compare = in_addr_data_compare_func,
+};
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