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libnm-glib-aux: add nm_ip6_addr_get_subnet_id()

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Add function nm_ip6_addr_get_subnet_id() to get the subnet ID of a
IPv6 address.
This commit is contained in:
Beniamino Galvani 2025-03-12 13:55:19 +01:00
parent 4ed1d04aff
commit dbc4ff0a1d
3 changed files with 86 additions and 0 deletions
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36
src/libnm-glib-aux/nm-inet-utils.c
View file

@ -238,6 +238,42 @@ nm_ip6_addr_clear_host_address(struct in6_addr *dst, const struct in6_addr *src,
return dst;
}
/**
* nm_ip6_addr_get_subnet_id:
* @addr: the IPv6 address
* @plen: the prefix length
*
* Given an IPv6 address and a prefix length, returns the subnet ID,
* defined as follows:
*
* | plen bits | (64 - plen) bits | 64 bits |
* +-----------------+------------------+-------------------------------+
* | prefix | subnet ID | interface ID |
* +-----------------+------------------+-------------------------------+
*
* The prefix length must be a value between 0 and 64.
*/
guint64
nm_ip6_addr_get_subnet_id(struct in6_addr *addr, guint8 plen)
{
int nbits = 64 - plen;
guint64 res = 0;
guint64 tmp;
guint64 i;
g_return_val_if_fail(addr, 0);
g_return_val_if_fail(plen <= 64, 0);
for (i = 0; i < 2 && nbits > 0; i++, nbits -= 32) {
tmp = htonl(addr->s6_addr32[1 - i]);
tmp = tmp & ((1ULL << NM_MIN(32U, (guint) nbits)) - 1);
tmp = tmp << (32 * i);
res += tmp;
}
return res;
}
int
nm_ip6_addr_same_prefix_cmp(const struct in6_addr *addr_a,
const struct in6_addr *addr_b,

2
src/libnm-glib-aux/nm-inet-utils.h
View file

@ -218,6 +218,8 @@ nm_ip4_addr_clear_host_address(in_addr_t addr, guint32 plen)
const struct in6_addr *
nm_ip6_addr_clear_host_address(struct in6_addr *dst, const struct in6_addr *src, guint32 plen);
guint64 nm_ip6_addr_get_subnet_id(struct in6_addr *addr, guint8 plen);
/*****************************************************************************/
static inline int

48
src/libnm-glib-aux/tests/test-shared-general.c
View file

@ -397,6 +397,53 @@ test_nm_ip4_addr_netmask_from_prefix(void)
/*****************************************************************************/
static void
test_nm_ip6_addr_get_subnet_id(void)
{
#define check_subnet_id(_addrstr, _plen, _subnet_id) \
{ \
struct in6_addr addr; \
\
addr = nmtst_inet6_from_string(_addrstr); \
g_assert_cmpint(nm_ip6_addr_get_subnet_id(&addr, _plen), ==, _subnet_id); \
}
check_subnet_id("aaaa:bbbb:cccc:ffff::", 64, 0);
check_subnet_id("aaaa:bbbb:cccc:fffe::", 63, 0);
check_subnet_id("aaaa:bbbb:cccc:ffff::", 63, 1);
check_subnet_id("aaaa:bbbb:cccc:fffc::", 62, 0);
check_subnet_id("aaaa:bbbb:cccc:fffd::", 62, 1);
check_subnet_id("aaaa:bbbb:cccc:fffe::", 62, 2);
check_subnet_id("aaaa:bbbb:cccc:ffff::", 62, 3);
check_subnet_id("aaaa:bbbb:cccc:fff8::", 61, 0);
check_subnet_id("aaaa:bbbb:cccc:ffff::", 61, 7);
check_subnet_id("aaaa:bbbb:cccc:fff0::", 60, 0);
check_subnet_id("aaaa:bbbb:cccc:fff2::", 60, 2);
check_subnet_id("aaaa:bbbb:cccc:ffff::", 60, 15);
check_subnet_id("aaaa:bbbb:cccc:0000::", 48, 0);
check_subnet_id("aaaa:bbbb:cccc:f000::", 48, 61440);
check_subnet_id("aaaa:bbbb:cccc:ffff::", 48, 65535);
check_subnet_id("aaaa:bbbb:cccc:0000::", 46, 0);
check_subnet_id("aaaa:bbbb:cccc:0001::", 46, 1);
check_subnet_id("aaaa:bbbb:ccce:5555::", 46, 152917);
check_subnet_id("aaaa:bbbb:0000:0000::", 32, 0);
check_subnet_id("aaaa:bbbb:0000:0001::", 32, 1);
check_subnet_id("aaaa:bbbb:0001:0001::", 32, 65537);
check_subnet_id("aaaa:bbbb:ffff:ffff::", 32, 0xffffffff);
check_subnet_id("aaaa:bbb8:0000:0000::", 30, 0);
check_subnet_id("aaaa:bbb8:0000:0001::", 30, 1);
check_subnet_id("aaaa:bbb8:0001:0001::", 30, 65537);
check_subnet_id("aaaa:bbbb:0000:0000::", 30, 0x300000000ULL);
check_subnet_id("aaaa:bbbb:0001:0001::", 30, 0x300010001ULL);
check_subnet_id("aaaa:bbbb:0001:0001::", 8, 0xAABBBB00010001ULL);
check_subnet_id("abaa:bbbb:0001:0001::", 7, 0x1AABBBB00010001ULL);
check_subnet_id("abaa:bbbb:0001:0001::", 0, 0xABAABBBB00010001ULL);
check_subnet_id("abaa:bbbb:0001:0001:5555:5555:5555:5555", 0, 0xABAABBBB00010001ULL);
check_subnet_id("::", 0, 0);
}
/*****************************************************************************/
static void
test_unaligned(void)
{
@ -2864,6 +2911,7 @@ main(int argc, char **argv)
g_test_add_func("/general/test_nm_ip4_addr_is_loopback", test_nm_ip4_addr_is_loopback);
g_test_add_func("/general/test_nm_ip4_addr_netmask_from_prefix",
test_nm_ip4_addr_netmask_from_prefix);
g_test_add_func("/general/test_nm_ip6_addr_get_subnet_id", test_nm_ip6_addr_get_subnet_id);
g_test_add_func("/general/test_unaligned", test_unaligned);
g_test_add_func("/general/test_strv_cmp", test_strv_cmp);
g_test_add_func("/general/test_strstrip_avoid_copy", test_strstrip_avoid_copy);