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ether-addr-util: split out logic to mark MAC addresses as random

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This commit is contained in:
Lennart Poettering 2023-12-18 14:47:47 +01:00 committed by Yu Watanabe
parent 32c376a46c
commit e22ca70008
3 changed files with 11 additions and 3 deletions
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8
src/basic/ether-addr-util.c
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@ -270,3 +270,11 @@ int parse_ether_addr(const char *s, struct ether_addr *ret) {
*ret = a.ether;
return 0;
}
void ether_addr_mark_random(struct ether_addr *addr) {
assert(addr);
/* see eth_random_addr in the kernel */
addr->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
addr->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
}

2
src/basic/ether-addr-util.h
View File

@ -113,3 +113,5 @@ static inline bool ether_addr_is_global(const struct ether_addr *addr) {
extern const struct hash_ops ether_addr_hash_ops;
extern const struct hash_ops ether_addr_hash_ops_free;
void ether_addr_mark_random(struct ether_addr *addr);

4
src/nspawn/nspawn-network.c
View File

@ -95,9 +95,7 @@ static int generate_mac(
assert_cc(ETH_ALEN <= sizeof(result));
memcpy(mac->ether_addr_octet, &result, ETH_ALEN);
/* see eth_random_addr in the kernel */
mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
ether_addr_mark_random(mac);
return 0;
}