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bde994efcc45d4e612a15fbd61de42b3149dea20
systemd/src/basic/in-addr-util.c
Nick Rosbrook 5dc89b327f tree-wide: remove some spurious newlines 
Specifically, remove double newlines, and newlines before '}'.
2025-01-29 16:17:46 +00:00

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <arpa/inet.h>
#include <endian.h>
#include <errno.h>
#include <net/if.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include "alloc-util.h"
#include "errno-util.h"
#include "in-addr-util.h"
#include "logarithm.h"
#include "macro.h"
#include "parse-util.h"
#include "random-util.h"
#include "stdio-util.h"
#include "string-util.h"
#include "strxcpyx.h"
bool in4_addr_is_null(const struct in_addr *a) {
assert(a);
return a->s_addr == 0;
}
bool in6_addr_is_null(const struct in6_addr *a) {
assert(a);
return IN6_IS_ADDR_UNSPECIFIED(a);
}
int in_addr_is_null(int family, const union in_addr_union *u) {
assert(u);
if (family == AF_INET)
return in4_addr_is_null(&u->in);
if (family == AF_INET6)
return in6_addr_is_null(&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);
}
bool in4_addr_is_link_local_dynamic(const struct in_addr *a) {
assert(a);
if (!in4_addr_is_link_local(a))
return false;
/* 169.254.0.0/24 and 169.254.255.0/24 must not be used for the dynamic IPv4LL assignment.
* See RFC 3927 Section 2.1:
* The IPv4 prefix 169.254/16 is registered with the IANA for this purpose. The first 256 and last
* 256 addresses in the 169.254/16 prefix are reserved for future use and MUST NOT be selected by a
* host using this dynamic configuration mechanism. */
return !IN_SET(be32toh(a->s_addr) & 0x0000FF00U, 0x0000U, 0xFF00U);
}
bool in6_addr_is_link_local(const struct in6_addr *a) {
assert(a);
return IN6_IS_ADDR_LINKLOCAL(a);
}
int in_addr_is_link_local(int family, const union in_addr_union *u) {
assert(u);
if (family == AF_INET)
return in4_addr_is_link_local(&u->in);
if (family == AF_INET6)
return in6_addr_is_link_local(&u->in6);
return -EAFNOSUPPORT;
}
bool in6_addr_is_link_local_all_nodes(const struct in6_addr *a) {
assert(a);
/* ff02::1 */
return be32toh(a->s6_addr32[0]) == UINT32_C(0xff020000) &&
a->s6_addr32[1] == 0 &&
a->s6_addr32[2] == 0 &&
be32toh(a->s6_addr32[3]) == UINT32_C(0x00000001);
}
bool in4_addr_is_multicast(const struct in_addr *a) {
assert(a);
return IN_MULTICAST(be32toh(a->s_addr));
}
bool in6_addr_is_multicast(const struct in6_addr *a) {
assert(a);
return IN6_IS_ADDR_MULTICAST(a);
}
int in_addr_is_multicast(int family, const union in_addr_union *u) {
assert(u);
if (family == AF_INET)
return in4_addr_is_multicast(&u->in);
if (family == AF_INET6)
return in6_addr_is_multicast(&u->in6);
return -EAFNOSUPPORT;
}
bool in4_addr_is_local_multicast(const struct in_addr *a) {
assert(a);
return (be32toh(a->s_addr) & UINT32_C(0xffffff00)) == UINT32_C(0xe0000000);
}
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;
}
bool in4_addr_is_non_local(const struct in_addr *a) {
/* Whether the address is not null and not localhost.
*
* As such, it is suitable to configure as DNS/NTP server from DHCP. */
return !in4_addr_is_null(a) &&
!in4_addr_is_localhost(a);
}
int in_addr_is_localhost(int family, const union in_addr_union *u) {
assert(u);
if (family == AF_INET)
return in4_addr_is_localhost(&u->in);
if (family == AF_INET6)
return IN6_IS_ADDR_LOOPBACK(&u->in6);
return -EAFNOSUPPORT;
}
int in_addr_is_localhost_one(int family, const union in_addr_union *u) {
assert(u);
if (family == AF_INET)
/* 127.0.0.1 */
return be32toh(u->in.s_addr) == UINT32_C(0x7F000001);
if (family == AF_INET6)
return IN6_IS_ADDR_LOOPBACK(&u->in6);
return -EAFNOSUPPORT;
}
bool in6_addr_is_ipv4_mapped_address(const struct in6_addr *a) {
return a->s6_addr32[0] == 0 &&
a->s6_addr32[1] == 0 &&
a->s6_addr32[2] == htobe32(UINT32_C(0x0000ffff));
}
bool in4_addr_equal(const struct in_addr *a, const struct in_addr *b) {
assert(a);
assert(b);
return a->s_addr == b->s_addr;
}
bool in6_addr_equal(const struct in6_addr *a, const struct in6_addr *b) {
assert(a);
assert(b);
return IN6_ARE_ADDR_EQUAL(a, b);
}
int in_addr_equal(int family, const union in_addr_union *a, const union in_addr_union *b) {
assert(a);
assert(b);
if (family == AF_INET)
return in4_addr_equal(&a->in, &b->in);
if (family == AF_INET6)
return in6_addr_equal(&a->in6, &b->in6);
return -EAFNOSUPPORT;
}
bool in4_addr_prefix_intersect(
const struct in_addr *a,
unsigned aprefixlen,
const struct in_addr *b,
unsigned bprefixlen) {
assert(a);
assert(b);
unsigned m = MIN3(aprefixlen, bprefixlen, (unsigned) (sizeof(struct in_addr) * 8));
if (m == 0)
return true; /* Let's return earlier, to avoid shift by 32. */
uint32_t x = be32toh(a->s_addr ^ b->s_addr);
uint32_t n = 0xFFFFFFFFUL << (32 - m);
return (x & n) == 0;
}
bool in6_addr_prefix_intersect(
const struct in6_addr *a,
unsigned aprefixlen,
const struct in6_addr *b,
unsigned bprefixlen) {
assert(a);
assert(b);
unsigned m = MIN3(aprefixlen, bprefixlen, (unsigned) (sizeof(struct in6_addr) * 8));
if (m == 0)
return true;
for (size_t i = 0; i < sizeof(struct in6_addr); i++) {
uint8_t x = a->s6_addr[i] ^ b->s6_addr[i];
uint8_t n = m < 8 ? (0xFF << (8 - m)) : 0xFF;
if ((x & n) != 0)
return false;
if (m <= 8)
break;
m -= 8;
}
return true;
}
int in_addr_prefix_intersect(
int family,
const union in_addr_union *a,
unsigned aprefixlen,
const union in_addr_union *b,
unsigned bprefixlen) {
assert(a);
assert(b);
/* Checks whether there are any addresses that are in both networks. */
if (family == AF_INET)
return in4_addr_prefix_intersect(&a->in, aprefixlen, &b->in, bprefixlen);
if (family == AF_INET6)
return in6_addr_prefix_intersect(&a->in6, aprefixlen, &b->in6, bprefixlen);
return -EAFNOSUPPORT;
}
int in_addr_prefix_next(int family, union in_addr_union *u, unsigned prefixlen) {
assert(u);
/* Increases the network part of an address by one. Returns 0 if that succeeds, or -ERANGE if
* this overflows. */
return in_addr_prefix_nth(family, u, prefixlen, 1);
}
/*
* Calculates the nth prefix of size prefixlen starting from the address denoted by u.
*
* On success 0 will be returned and the calculated prefix will be available in
* u. In case the calculation cannot be performed (invalid prefix length,
* overflows would occur) -ERANGE is returned. If the address family given isn't
* supported -EAFNOSUPPORT will be returned.
*
* Examples:
* - in_addr_prefix_nth(AF_INET, 192.168.0.0, 24, 2), returns 0, writes 192.168.2.0 to u
* - in_addr_prefix_nth(AF_INET, 192.168.0.0, 24, 0), returns 0, no data written
* - in_addr_prefix_nth(AF_INET, 255.255.255.0, 24, 1), returns -ERANGE, no data written
* - in_addr_prefix_nth(AF_INET, 255.255.255.0, 0, 1), returns -ERANGE, no data written
* - in_addr_prefix_nth(AF_INET6, 2001:db8, 64, 0xff00) returns 0, writes 2001:0db8:0000:ff00:: to u
*/
int in_addr_prefix_nth(int family, union in_addr_union *u, unsigned prefixlen, uint64_t nth) {
assert(u);
if (prefixlen <= 0)
return -ERANGE;
if (family == AF_INET) {
uint32_t c, n, t;
if (prefixlen > 32)
return -ERANGE;
c = be32toh(u->in.s_addr);
t = nth << (32 - prefixlen);
/* Check for wrap */
if (c > UINT32_MAX - t)
return -ERANGE;
n = c + t;
n &= UINT32_C(0xFFFFFFFF) << (32 - prefixlen);
u->in.s_addr = htobe32(n);
return 0;
}
if (family == AF_INET6) {
bool overflow = false;
if (prefixlen > 128)
return -ERANGE;
for (unsigned i = 16; i > 0; i--) {
unsigned t, j = i - 1, p = j * 8;
if (p >= prefixlen) {
u->in6.s6_addr[j] = 0;
continue;
}
if (prefixlen - p < 8) {
u->in6.s6_addr[j] &= 0xff << (8 - (prefixlen - p));
t = u->in6.s6_addr[j] + ((nth & 0xff) << (8 - (prefixlen - p)));
nth >>= prefixlen - p;
} else {
t = u->in6.s6_addr[j] + (nth & 0xff) + overflow;
nth >>= 8;
}
overflow = t > UINT8_MAX;
u->in6.s6_addr[j] = (uint8_t) (t & 0xff);
}
if (overflow || nth != 0)
return -ERANGE;
return 0;
}
return -EAFNOSUPPORT;
}
int in_addr_random_prefix(
int family,
union in_addr_union *u,
unsigned prefixlen_fixed_part,
unsigned prefixlen) {
assert(u);
/* Random network part of an address by one. */
if (prefixlen <= 0)
return 0;
if (family == AF_INET) {
uint32_t c, n;
if (prefixlen_fixed_part > 32)
prefixlen_fixed_part = 32;
if (prefixlen > 32)
prefixlen = 32;
if (prefixlen_fixed_part >= prefixlen)
return -EINVAL;
c = be32toh(u->in.s_addr);
c &= ((UINT32_C(1) << prefixlen_fixed_part) - 1) << (32 - prefixlen_fixed_part);
random_bytes(&n, sizeof(n));
n &= ((UINT32_C(1) << (prefixlen - prefixlen_fixed_part)) - 1) << (32 - prefixlen);
u->in.s_addr = htobe32(n | c);
return 1;
}
if (family == AF_INET6) {
struct in6_addr n;
unsigned i, j;
if (prefixlen_fixed_part > 128)
prefixlen_fixed_part = 128;
if (prefixlen > 128)
prefixlen = 128;
if (prefixlen_fixed_part >= prefixlen)
return -EINVAL;
random_bytes(&n, sizeof(n));
for (i = 0; i < 16; i++) {
uint8_t mask_fixed_part = 0, mask = 0;
if (i < (prefixlen_fixed_part + 7) / 8) {
if (i < prefixlen_fixed_part / 8)
mask_fixed_part = 0xffu;
else {
j = prefixlen_fixed_part % 8;
mask_fixed_part = ((UINT8_C(1) << (j + 1)) - 1) << (8 - j);
}
}
if (i < (prefixlen + 7) / 8) {
if (i < prefixlen / 8)
mask = 0xffu ^ mask_fixed_part;
else {
j = prefixlen % 8;
mask = (((UINT8_C(1) << (j + 1)) - 1) << (8 - j)) ^ mask_fixed_part;
}
}
u->in6.s6_addr[i] &= mask_fixed_part;
u->in6.s6_addr[i] |= n.s6_addr[i] & mask;
}
return 1;
}
return -EAFNOSUPPORT;
}
int in_addr_prefix_range(
int family,
const union in_addr_union *in,
unsigned prefixlen,
union in_addr_union *ret_start,
union in_addr_union *ret_end) {
union in_addr_union start, end;
int r;
assert(in);
if (!IN_SET(family, AF_INET, AF_INET6))
return -EAFNOSUPPORT;
if (ret_start) {
start = *in;
r = in_addr_prefix_nth(family, &start, prefixlen, 0);
if (r < 0)
return r;
}
if (ret_end) {
end = *in;
r = in_addr_prefix_nth(family, &end, prefixlen, 1);
if (r < 0)
return r;
}
if (ret_start)
*ret_start = start;
if (ret_end)
*ret_end = end;
return 0;
}
int in_addr_to_string(int family, const union in_addr_union *u, char **ret) {
_cleanup_free_ char *x = NULL;
size_t l;
assert(u);
assert(ret);
if (family == AF_INET)
l = INET_ADDRSTRLEN;
else if (family == AF_INET6)
l = INET6_ADDRSTRLEN;
else
return -EAFNOSUPPORT;
x = new(char, l);
if (!x)
return -ENOMEM;
errno = 0;
if (!typesafe_inet_ntop(family, u, x, l))
return errno_or_else(EINVAL);
*ret = TAKE_PTR(x);
return 0;
}
int in_addr_prefix_to_string(
int family,
const union in_addr_union *u,
unsigned prefixlen,
char *buf,
size_t buf_len) {
assert(u);
assert(buf);
if (!IN_SET(family, AF_INET, AF_INET6))
return -EAFNOSUPPORT;
errno = 0;
if (!typesafe_inet_ntop(family, u, buf, buf_len))
return errno_or_else(ENOSPC);
size_t l = strlen(buf);
if (!snprintf_ok(buf + l, buf_len - l, "/%u", prefixlen))
return -ENOSPC;
return 0;
}
int in_addr_port_ifindex_name_to_string(int family, const union in_addr_union *u, uint16_t port, int ifindex, const char *server_name, char **ret) {
_cleanup_free_ char *ip_str = NULL, *x = NULL;
int r;
assert(IN_SET(family, AF_INET, AF_INET6));
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. */
r = in_addr_to_string(family, u, &ip_str);
if (r < 0)
return r;
if (family == AF_INET6) {
r = in_addr_is_link_local(family, u);
if (r < 0)
return r;
if (r == 0)
ifindex = 0;
} else
ifindex = 0; /* For IPv4 address, ifindex is always ignored. */
if (port == 0 && ifindex == 0 && isempty(server_name)) {
*ret = TAKE_PTR(ip_str);
return 0;
}
const char *separator = isempty(server_name) ? "" : "#";
server_name = strempty(server_name);
if (port > 0) {
if (family == AF_INET6) {
if (ifindex > 0)
r = asprintf(&x, "[%s]:%"PRIu16"%%%i%s%s", ip_str, port, ifindex, separator, server_name);
else
r = asprintf(&x, "[%s]:%"PRIu16"%s%s", ip_str, port, separator, server_name);
} else
r = asprintf(&x, "%s:%"PRIu16"%s%s", ip_str, port, separator, server_name);
} else {
if (ifindex > 0)
r = asprintf(&x, "%s%%%i%s%s", ip_str, ifindex, separator, server_name);
else {
x = strjoin(ip_str, separator, server_name);
r = x ? 0 : -ENOMEM;
}
}
if (r < 0)
return -ENOMEM;
*ret = TAKE_PTR(x);
return 0;
}
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 ?: &buffer) <= 0)
return errno_or_else(EINVAL);
return 0;
}
int in_addr_from_string_auto(const char *s, int *ret_family, union in_addr_union *ret) {
int r;
assert(s);
r = in_addr_from_string(AF_INET, s, ret);
if (r >= 0) {
if (ret_family)
*ret_family = AF_INET;
return 0;
}
r = in_addr_from_string(AF_INET6, s, ret);
if (r >= 0) {
if (ret_family)
*ret_family = AF_INET6;
return 0;
}
return -EINVAL;
}
unsigned char in4_addr_netmask_to_prefixlen(const struct in_addr *addr) {
assert(addr);
return 32U - u32ctz(be32toh(addr->s_addr));
}
/* Calculate an IPv4 netmask from prefix length, for example /8 -> 255.0.0.0. */
struct in_addr* in4_addr_prefixlen_to_netmask(struct in_addr *addr, unsigned char prefixlen) {
assert(addr);
assert(prefixlen <= 32);
/* Shifting beyond 32 is not defined, handle this specially. */
if (prefixlen == 0)
addr->s_addr = 0;
else
addr->s_addr = htobe32((0xffffffff << (32 - prefixlen)) & 0xffffffff);
return addr;
}
/* Calculate an IPv6 netmask from prefix length, for example /16 -> ffff::. */
struct in6_addr* in6_addr_prefixlen_to_netmask(struct in6_addr *addr, unsigned char prefixlen) {
assert(addr);
assert(prefixlen <= 128);
for (unsigned i = 0; i < 16; i++) {
uint8_t mask;
if (prefixlen >= 8) {
mask = 0xFF;
prefixlen -= 8;
} else if (prefixlen > 0) {
mask = 0xFF << (8 - prefixlen);
prefixlen = 0;
} else {
assert(prefixlen == 0);
mask = 0;
}
addr->s6_addr[i] = mask;
}
return addr;
}
/* Calculate an IPv4 or IPv6 netmask from prefix length, for example /8 -> 255.0.0.0 or /16 -> ffff::. */
int in_addr_prefixlen_to_netmask(int family, union in_addr_union *addr, unsigned char prefixlen) {
assert(addr);
switch (family) {
case AF_INET:
in4_addr_prefixlen_to_netmask(&addr->in, prefixlen);
return 0;
case AF_INET6:
in6_addr_prefixlen_to_netmask(&addr->in6, prefixlen);
return 0;
default:
return -EAFNOSUPPORT;
}
}
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 */
assert(addr);
assert(prefixlen);
if (msb_octet < 128)
/* class A, leading bits: 0 */
*prefixlen = 8;
else if (msb_octet < 192)
/* class B, leading bits 10 */
*prefixlen = 16;
else if (msb_octet < 224)
/* class C, leading bits 110 */
*prefixlen = 24;
else
/* class D or E, no default prefixlen */
return -ERANGE;
return 0;
}
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 = in4_addr_default_prefixlen(addr, &prefixlen);
if (r < 0)
return r;
in4_addr_prefixlen_to_netmask(mask, prefixlen);
return 0;
}
int in4_addr_mask(struct in_addr *addr, unsigned char prefixlen) {
struct in_addr mask;
assert(addr);
if (!in4_addr_prefixlen_to_netmask(&mask, prefixlen))
return -EINVAL;
addr->s_addr &= mask.s_addr;
return 0;
}
int in6_addr_mask(struct in6_addr *addr, unsigned char prefixlen) {
unsigned i;
for (i = 0; i < 16; i++) {
uint8_t mask;
if (prefixlen >= 8) {
mask = 0xFF;
prefixlen -= 8;
} else if (prefixlen > 0) {
mask = 0xFF << (8 - prefixlen);
prefixlen = 0;
} else {
assert(prefixlen == 0);
mask = 0;
}
addr->s6_addr[i] &= mask;
}
return 0;
}
int in_addr_mask(int family, union in_addr_union *addr, unsigned char prefixlen) {
assert(addr);
switch (family) {
case AF_INET:
return in4_addr_mask(&addr->in, prefixlen);
case AF_INET6:
return in6_addr_mask(&addr->in6, prefixlen);
default:
return -EAFNOSUPPORT;
}
}
int in4_addr_prefix_covers_full(
const struct in_addr *prefix,
unsigned char prefixlen,
const struct in_addr *address,
unsigned char address_prefixlen) {
struct in_addr masked_prefix, masked_address;
int r;
assert(prefix);
assert(address);
if (prefixlen > address_prefixlen)
return false;
masked_prefix = *prefix;
r = in4_addr_mask(&masked_prefix, prefixlen);
if (r < 0)
return r;
masked_address = *address;
r = in4_addr_mask(&masked_address, prefixlen);
if (r < 0)
return r;
return in4_addr_equal(&masked_prefix, &masked_address);
}
int in6_addr_prefix_covers_full(
const struct in6_addr *prefix,
unsigned char prefixlen,
const struct in6_addr *address,
unsigned char address_prefixlen) {
struct in6_addr masked_prefix, masked_address;
int r;
assert(prefix);
assert(address);
if (prefixlen > address_prefixlen)
return false;
masked_prefix = *prefix;
r = in6_addr_mask(&masked_prefix, prefixlen);
if (r < 0)
return r;
masked_address = *address;
r = in6_addr_mask(&masked_address, prefixlen);
if (r < 0)
return r;
return in6_addr_equal(&masked_prefix, &masked_address);
}
int in_addr_prefix_covers_full(
int family,
const union in_addr_union *prefix,
unsigned char prefixlen,
const union in_addr_union *address,
unsigned char address_prefixlen) {
assert(prefix);
assert(address);
switch (family) {
case AF_INET:
return in4_addr_prefix_covers_full(&prefix->in, prefixlen, &address->in, address_prefixlen);
case AF_INET6:
return in6_addr_prefix_covers_full(&prefix->in6, prefixlen, &address->in6, address_prefixlen);
default:
return -EAFNOSUPPORT;
}
}
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) {
_cleanup_free_ char *str = NULL;
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) {
str = strndup(p, e - p);
if (!str)
return -ENOMEM;
l = str;
} 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_full(
const char *p,
InAddrPrefixLenMode mode,
int *ret_family,
union in_addr_union *ret_prefix,
unsigned char *ret_prefixlen) {
_cleanup_free_ char *str = NULL;
union in_addr_union buffer;
const char *e, *l;
unsigned char k;
int family, r;
assert(p);
e = strchr(p, '/');
if (e) {
str = strndup(p, e - p);
if (!str)
return -ENOMEM;
l = str;
} 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
switch (mode) {
case PREFIXLEN_FULL:
k = FAMILY_ADDRESS_SIZE(family) * 8;
break;
case PREFIXLEN_REFUSE:
return -ENOANO; /* To distinguish this error from others. */
default:
assert_not_reached();
}
if (ret_family)
*ret_family = family;
if (ret_prefix)
*ret_prefix = buffer;
if (ret_prefixlen)
*ret_prefixlen = k;
return 0;
}
void in_addr_hash_func(const union in_addr_union *u, int family, struct siphash *state) {
assert(u);
assert(state);
siphash24_compress(u->bytes, FAMILY_ADDRESS_SIZE(family), state);
}
void in_addr_data_hash_func(const struct in_addr_data *a, struct siphash *state) {
assert(a);
assert(state);
siphash24_compress_typesafe(a->family, state);
in_addr_hash_func(&a->address, a->family, state);
}
int in_addr_data_compare_func(const struct in_addr_data *x, const struct in_addr_data *y) {
int r;
assert(x);
assert(y);
r = CMP(x->family, y->family);
if (r != 0)
return r;
return memcmp(&x->address, &y->address, FAMILY_ADDRESS_SIZE(x->family));
}
DEFINE_HASH_OPS(
in_addr_data_hash_ops,
struct in_addr_data,
in_addr_data_hash_func,
in_addr_data_compare_func);
DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR(
in_addr_data_hash_ops_free,
struct in_addr_data,
in_addr_data_hash_func,
in_addr_data_compare_func,
free);
void in6_addr_hash_func(const struct in6_addr *addr, struct siphash *state) {
assert(addr);
assert(state);
siphash24_compress_typesafe(*addr, state);
}
int in6_addr_compare_func(const struct in6_addr *a, const struct in6_addr *b) {
assert(a);
assert(b);
return memcmp(a, b, sizeof(*a));
}
DEFINE_HASH_OPS(
in6_addr_hash_ops,
struct in6_addr,
in6_addr_hash_func,
in6_addr_compare_func);
DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR(
in6_addr_hash_ops_free,
struct in6_addr,
in6_addr_hash_func,
in6_addr_compare_func,
free);
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