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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "alloc-util.h"
#include "extract-word.h"
#include "hostname-util.h"
#include "in-addr-prefix-util.h"
#include "string-util.h"
/* 0.0.0.0/0 */
#define IN_ADDR_PREFIX_IPV4_ANY ((struct in_addr_prefix) { .family = AF_INET })
/* ::/0 */
#define IN_ADDR_PREFIX_IPV6_ANY ((struct in_addr_prefix) { .family = AF_INET6 })
/* 127.0.0.0/8 */
#define IN_ADDR_PREFIX_IPV4_LOCALHOST \
((struct in_addr_prefix) { \
.family = AF_INET, \
.address.in.s_addr = htobe32(UINT32_C(127) << 24), \
.prefixlen = 8, \
})
/* ::1/128 */
#define IN_ADDR_PREFIX_IPV6_LOCALHOST \
((struct in_addr_prefix) { \
.family = AF_INET6, \
.address.in6 = IN6ADDR_LOOPBACK_INIT, \
.prefixlen = 128, \
})
/* 169.254.0.0/16 */
#define IN_ADDR_PREFIX_IPV4_LINKLOCAL \
((struct in_addr_prefix) { \
.family = AF_INET, \
.address.in.s_addr = htobe32((UINT32_C(169) << 24) | \
(UINT32_C(254) << 16)), \
.prefixlen = 16, \
})
/* fe80::/64 */
#define IN_ADDR_PREFIX_IPV6_LINKLOCAL \
((struct in_addr_prefix) { \
.family = AF_INET6, \
.address.in6.s6_addr[0] = 0xfe, \
.address.in6.s6_addr[1] = 0x80, \
.prefixlen = 64, \
})
/* 224.0.0.0/4 */
#define IN_ADDR_PREFIX_IPV4_MULTICAST \
((struct in_addr_prefix) { \
.family = AF_INET, \
.address.in.s_addr = htobe32((UINT32_C(224) << 24)), \
.prefixlen = 4, \
})
/* ff00::/8 */
#define IN_ADDR_PREFIX_IPV6_MULTICAST \
((struct in_addr_prefix) { \
.family = AF_INET6, \
.address.in6.s6_addr[0] = 0xff, \
.prefixlen = 8, \
})
static void in_addr_prefix_hash_func(const struct in_addr_prefix *a, struct siphash *state) {
assert(a);
assert(state);
siphash24_compress(&a->family, sizeof(a->family), state);
siphash24_compress(&a->prefixlen, sizeof(a->prefixlen), state);
siphash24_compress(&a->address, FAMILY_ADDRESS_SIZE(a->family), state);
}
static int in_addr_prefix_compare_func(const struct in_addr_prefix *x, const struct in_addr_prefix *y) {
int r;
assert(x);
assert(y);
r = CMP(x->family, y->family);
if (r != 0)
return r;
r = CMP(x->prefixlen, y->prefixlen);
if (r != 0)
return r;
return memcmp(&x->address, &y->address, FAMILY_ADDRESS_SIZE(x->family));
}
DEFINE_HASH_OPS(in_addr_prefix_hash_ops, struct in_addr_prefix, in_addr_prefix_hash_func, in_addr_prefix_compare_func);
DEFINE_HASH_OPS_WITH_KEY_DESTRUCTOR(in_addr_prefix_hash_ops_free, struct in_addr_prefix, in_addr_prefix_hash_func, in_addr_prefix_compare_func, free);
int in_addr_prefix_add(Set **prefixes, const struct in_addr_prefix *prefix) {
struct in_addr_prefix *copy;
assert(prefixes);
assert(prefix);
assert(IN_SET(prefix->family, AF_INET, AF_INET6));
copy = newdup(struct in_addr_prefix, prefix, 1);
if (!copy)
return -ENOMEM;
(void) in_addr_mask(copy->family, ©->address, copy->prefixlen);
return set_ensure_consume(prefixes, &in_addr_prefix_hash_ops_free, copy);
}
int in_addr_prefixes_reduce(Set *prefixes) {
uint32_t ipv4_prefixlen_bits = 0;
uint64_t ipv6_prefixlen_bits[128 / sizeof(uint64_t)] = {};
uint8_t ipv4_prefixlens[32] = {}, ipv6_prefixlens[128] = {};
bool ipv4_has_any = false, ipv6_has_any = false;
size_t ipv4_n_prefixlens = 0, ipv6_n_prefixlens = 0;
struct in_addr_prefix *p;
SET_FOREACH(p, prefixes)
switch (p->family) {
case AF_INET:
assert(p->prefixlen <= 32);
if (p->prefixlen == 0)
ipv4_has_any = true;
else
ipv4_prefixlen_bits |= UINT32_C(1) << (p->prefixlen - 1);
break;
case AF_INET6:
assert(p->prefixlen <= 128);
if (p->prefixlen == 0)
ipv6_has_any = true;
else
ipv6_prefixlen_bits[(p->prefixlen - 1) / sizeof(uint64_t)] |=
UINT64_C(1) << ((p->prefixlen - 1) % sizeof(uint64_t));
break;
default:
assert_not_reached();
}
if (!ipv4_has_any)
for (size_t i = 0; i < 32; i++)
if (ipv4_prefixlen_bits & (UINT32_C(1) << i))
ipv4_prefixlens[ipv4_n_prefixlens++] = i + 1;
if (!ipv6_has_any)
for (size_t i = 0; i < 128; i++)
if (ipv6_prefixlen_bits[i / sizeof(uint64_t)] &
(UINT64_C(1) << (i % sizeof(uint64_t))))
ipv6_prefixlens[ipv6_n_prefixlens++] = i + 1;
SET_FOREACH(p, prefixes) {
uint8_t *prefixlens;
bool covered;
size_t *n;
if (p->prefixlen == 0)
continue;
switch (p->family) {
case AF_INET:
prefixlens = ipv4_prefixlens;
n = &ipv4_n_prefixlens;
covered = ipv4_has_any;
break;
case AF_INET6:
prefixlens = ipv6_prefixlens;
n = &ipv6_n_prefixlens;
covered = ipv6_has_any;
break;
default:
assert_not_reached();
}
for (size_t i = 0; i < *n; i++) {
struct in_addr_prefix tmp;
if (covered)
break;
if (prefixlens[i] >= p->prefixlen)
break;
tmp = *p;
tmp.prefixlen = prefixlens[i];
(void) in_addr_mask(tmp.family, &tmp.address, tmp.prefixlen);
covered = set_contains(prefixes, &tmp);
}
if (covered)
free(set_remove(prefixes, p));
}
return 0;
}
int in_addr_prefixes_merge(Set **dest, Set *src) {
struct in_addr_prefix *p;
int r;
assert(dest);
SET_FOREACH(p, src) {
r = in_addr_prefix_add(dest, p);
if (r < 0)
return r;
}
return 0;
}
bool in_addr_prefixes_is_any(Set *prefixes) {
return
set_contains(prefixes, &IN_ADDR_PREFIX_IPV4_ANY) &&
set_contains(prefixes, &IN_ADDR_PREFIX_IPV6_ANY);
}
int config_parse_in_addr_prefixes(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Set **prefixes = ASSERT_PTR(data);
int r;
assert(IN_SET(ltype, AF_UNSPEC, AF_INET, AF_INET6));
if (isempty(rvalue)) {
*prefixes = set_free(*prefixes);
return 0;
}
for (const char *p = rvalue;;) {
_cleanup_free_ char *word = NULL;
r = extract_first_word(&p, &word, NULL, 0);
if (r == -ENOMEM)
return log_oom();
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r, "Invalid syntax, ignoring: %s", rvalue);
return 0;
}
if (r == 0)
return 0;
if (streq(word, "any")) {
/* "any" is a shortcut for 0.0.0.0/0 and ::/0 */
if (ltype != AF_INET6) {
r = in_addr_prefix_add(prefixes, &IN_ADDR_PREFIX_IPV4_ANY);
if (r < 0)
return log_oom();
}
if (ltype != AF_INET) {
r = in_addr_prefix_add(prefixes, &IN_ADDR_PREFIX_IPV6_ANY);
if (r < 0)
return log_oom();
}
} else if (is_localhost(word)) {
/* "localhost" is a shortcut for 127.0.0.0/8 and ::1/128 */
if (ltype != AF_INET6) {
r = in_addr_prefix_add(prefixes, &IN_ADDR_PREFIX_IPV4_LOCALHOST);
if (r < 0)
return log_oom();
}
if (ltype != AF_INET) {
r = in_addr_prefix_add(prefixes, &IN_ADDR_PREFIX_IPV6_LOCALHOST);
if (r < 0)
return log_oom();
}
} else if (streq(word, "link-local")) {
/* "link-local" is a shortcut for 169.254.0.0/16 and fe80::/64 */
if (ltype != AF_INET6) {
r = in_addr_prefix_add(prefixes, &IN_ADDR_PREFIX_IPV4_LINKLOCAL);
if (r < 0)
return log_oom();
}
if (ltype != AF_INET) {
r = in_addr_prefix_add(prefixes, &IN_ADDR_PREFIX_IPV6_LINKLOCAL);
if (r < 0)
return log_oom();
}
} else if (streq(word, "multicast")) {
/* "multicast" is a shortcut for 224.0.0.0/4 and ff00::/8 */
if (ltype != AF_INET6) {
r = in_addr_prefix_add(prefixes, &IN_ADDR_PREFIX_IPV4_MULTICAST);
if (r < 0)
return log_oom();
}
if (ltype != AF_INET) {
r = in_addr_prefix_add(prefixes, &IN_ADDR_PREFIX_IPV6_MULTICAST);
if (r < 0)
return log_oom();
}
} else {
struct in_addr_prefix a;
if (ltype == AF_UNSPEC)
r = in_addr_prefix_from_string_auto(word, &a.family, &a.address, &a.prefixlen);
else {
a.family = ltype;
r = in_addr_prefix_from_string(word, a.family, &a.address, &a.prefixlen);
}
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Invalid address prefix is specified in [%s] %s=, ignoring assignment: %s",
section, lvalue, word);
continue;
}
r = in_addr_prefix_add(prefixes, &a);
if (r < 0)
return log_oom();
}
}
}
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