Revert "allow specifying a subnet id"

This reverts commit 689c5ad563.

src/config.c

@@ -163,7 +163,6 @@ static struct cfg_options available_options[] = {
 
 	{ .name = "ipv6-network", .type = OPTION_STRING, .mandatory = 0 },
 	{ .name = "ipv6-prefix", .type = OPTION_NUMERIC, .mandatory = 0 },
-	{ .name = "ipv6-subnet-id-length", .type = OPTION_NUMERIC, .mandatory = 0 },
 	{ .name = "route-add-cmd", .type = OPTION_STRING, .mandatory = 0 },
 	{ .name = "route-del-cmd", .type = OPTION_STRING, .mandatory = 0 },
 	{ .name = "config-per-user", .type = OPTION_STRING, .mandatory = 0 },
@@ -887,9 +886,6 @@ unsigned urlfw_size = 0;
 	}
 
 	READ_STRING("ipv6-network", config->network.ipv6);
-	READ_NUMERIC("ipv6-subnet-id-length", config->network.ipv6_subnet_id_length);
-	if (config->network.ipv6_subnet_id_length == 0)
-		config->network.ipv6_subnet_id_length = DEFAULT_SUBNET_ID_LENGTH;
 
 	prefix = extract_prefix(config->network.ipv6);
 	if (prefix == 0) {

src/ocserv-args.def

@@ -450,11 +450,6 @@ ipv4-netmask = 255.255.255.0
 # The IPv6 subnet that leases will be given from.
 #ipv6-network = fda9:4efe:7e3b:03ea::/64
 
-# The length, in bits, of the subnet id to give addresses to clients.
-# This also defines the maximum number of clients the server can handle,
-# i.e., 2^(length).
-#ipv6-subnet-id-length = 16
-
 # The advertized DNS server. Use multiple lines for
 # multiple servers.
 # dns = fc00::4be0

src/vpn.h

@@ -66,7 +66,6 @@ typedef enum {
 #define DEFAULT_KKDCP_POINTS 1
 #define DEFAULT_MAX_BAN_SCORE (MAX_PASSWORD_TRIES*DEFAULT_PASSWORD_POINTS)
 #define DEFAULT_BAN_RESET_TIME 300
-#define DEFAULT_SUBNET_ID_LENGTH 16
 
 #define MIN_NO_COMPRESS_LIMIT 64
 #define DEFAULT_NO_COMPRESS_LIMIT 256
@@ -219,7 +218,6 @@ struct vpn_st {
 
 	char *ipv6;
 	char *ipv6_local; /* local IPv6 address */
-	unsigned ipv6_subnet_id_length;
 	unsigned int mtu;
 
 	char **routes;