treewide: simplify dhcp leasetime checking

Set dhcp leasetim to 43200 seconds for all interfaces independant
if dhcpv4 is enabled for an interface. Minimum allowed leasetime
is 60 seconds when parsing leastime configuration; this allows to
clean up the awkward leasetime checks on different places in the code

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

3 files changed, 10 insertions, 22 deletions

diff --git a/src/config.c b/src/config.c
index b621c75..df0cbc4 100644
--- a/src/config.c
+++ b/src/config.c
@@ -192,6 +192,7 @@ static void set_interface_defaults(struct interface *iface)
 {
 	iface->managed = 1;
 	iface->learn_routes = 1;
+	iface->dhcpv4_leasetime = 43200;
 	iface->ra_maxinterval = 600;
 	iface->ra_mininterval = iface->ra_maxinterval/3;
 	iface->ra_lifetime = -1;
@@ -288,10 +289,10 @@ static double parse_leasetime(struct blob_attr *c) {
 			goto err;
 	}
 
-	if (time >= 60)
-		return time;
+	if (time < 60)
+		time = 60;
 
-	return 0;
+	return time;
 
 err:
 	return -1;
@@ -351,8 +352,7 @@ static int set_lease(struct uci_section *s)
 		if (time < 0)
 			goto err;
 
-		if (time >= 60)
-			lease->dhcpv4_leasetime = time;
+		lease->dhcpv4_leasetime = time;
 	}
 
 	list_add(&lease->head, &leases);
@@ -425,8 +425,7 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr
 		if (time < 0)
 			goto err;
 
-		if (time >= 60)
-			iface->dhcpv4_leasetime = time;
+		iface->dhcpv4_leasetime = time;
 	}
 
 	if ((c = tb[IFACE_ATTR_START])) {
diff --git a/src/dhcpv4.c b/src/dhcpv4.c
index 5ef99b1..81e537d 100644
--- a/src/dhcpv4.c
+++ b/src/dhcpv4.c
@@ -153,8 +153,7 @@ int setup_dhcpv4_interface(struct interface *iface, bool enable)
 				return -1;
 			}
 
-			if (lease->dhcpv4_leasetime >= 60)
-				a->leasetime = lease->dhcpv4_leasetime;
+			a->leasetime = lease->dhcpv4_leasetime;
 
 			a->addr = ntohl(lease->ipaddr.s_addr);
 			memcpy(a->hwaddr, lease->mac.ether_addr_octet, sizeof(a->hwaddr));
@@ -194,10 +193,6 @@ int setup_dhcpv4_interface(struct interface *iface, bool enable)
 				free_dhcpv4_assignment(a);
 		}
 
-
-		if (iface->dhcpv4_leasetime < 60)
-			iface->dhcpv4_leasetime = 43200;
-
 		iface->dhcpv4_event.uloop.fd = sock;
 		iface->dhcpv4_event.handle_dgram = handle_dhcpv4;
 		odhcpd_register(&iface->dhcpv4_event);
@@ -627,7 +622,7 @@ static struct dhcpv4_assignment* dhcpv4_lease(struct interface *iface,
 			assigned = dhcpv4_assign(iface, a, raddr);
 		}
 
-		if (a->leasetime >= 60)
+		if (a->leasetime)
 			my_leasetime = a->leasetime;
 		else
 			my_leasetime = iface->dhcpv4_leasetime;
diff --git a/src/dhcpv6-ia.c b/src/dhcpv6-ia.c
index 84f368e..888634f 100644
--- a/src/dhcpv6-ia.c
+++ b/src/dhcpv6-ia.c
@@ -88,8 +88,7 @@ int setup_dhcpv6_ia_interface(struct interface *iface, bool enable)
 				return -1;
 			}
 
-			if (lease->dhcpv4_leasetime > 0)
-				a->leasetime = lease->dhcpv4_leasetime;
+			a->leasetime = lease->dhcpv4_leasetime;
 
 			a->clid_len = duid_len;
 			a->length = 128;
@@ -719,16 +718,11 @@ static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status,
 	} else {
 		if (a) {
 			uint32_t leasetime;
-			if (a->leasetime > 0)
+			if (a->leasetime)
 				leasetime = a->leasetime;
 			else
 				leasetime = iface->dhcpv4_leasetime;
 
-			if (leasetime == 0)
-				leasetime = 3600;
-			else if (leasetime < 60)
-				leasetime = 60;
-
 			uint32_t pref = leasetime;
 			uint32_t valid = leasetime;