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udhcpd: keep expired leases at startup

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Let udhcpd retain the information about expired leases when restarting
so that the leases are reserved until they possibly become the oldest
expired lease.

This reduces the frequency of IP address changes for example when the
DHCP server and a group of clients, who do not store and request their
previously offered IP address across restarts, are collectively restarted
and the startup order of the clients are not guaranteed.

Signed-off-by: Christian Lindeberg <christian.lindeberg@axis.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Christian Lindeberg 2016-03-01 19:23:22 +01:00 committed by Denys Vlasenko
parent e5aba88712
commit ea2b71be66
2 changed files with 8 additions and 2 deletions
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6
networking/udhcp/files.c
View File

@ -195,7 +195,11 @@ void FAST_FUNC read_leases(const char *file)
uint32_t static_nip;
if (expires <= 0)
continue;
/* We keep expired leases: add_lease() will add
* a lease with 0 seconds remaining.
* Fewer IP address changes this way for mass reboot scenario.
*/
expires = 0;
/* Check if there is a different static lease for this IP or MAC */
static_nip = get_static_nip_by_mac(server_config.static_leases, lease.lease_mac);

4
networking/udhcp/leases.c
View File

@ -17,7 +17,9 @@ static struct dyn_lease *oldest_expired_lease(void)
/* Unexpired leases have g_leases[i].expires >= current time
* and therefore can't ever match */
for (i = 0; i < server_config.max_leases; i++) {
if (g_leases[i].expires < oldest_time) {
if (g_leases[i].expires == 0 /* empty entry */
|| g_leases[i].expires < oldest_time
) {
oldest_time = g_leases[i].expires;
oldest_lease = &g_leases[i];
}