odhcpd: add support for dhcpv6_pd_min_len parameter

[project/odhcpd.git] / src / config.c

diff --git a/src/config.c b/src/config.c
index d7cd5dd0aa9c87427698a6d0c94b0ed120e49910..e63181400193f38970c0a5dab6e0620565bda9e2 100644 (file)
--- a/src/config.c
+++ b/src/config.c
@@ -39,6 +39,8 @@ struct config config = {.legacy = false, .main_dhcpv4 = false,
 #define HOSTID_LEN_MAX 64
 #define HOSTID_LEN_DEFAULT HOSTID_LEN_MIN
 
+#define PD_MIN_LEN_MAX (64-2) // must delegate at least 2 bits of prefix
+
 #define OAF_DHCPV6     (OAF_DHCPV6_NA | OAF_DHCPV6_PD)
 
 enum {
@@ -64,6 +66,7 @@ enum {
        IFACE_ATTR_DHCPV6_RAW,
        IFACE_ATTR_DHCPV6_ASSIGNALL,
        IFACE_ATTR_DHCPV6_PD,
+       IFACE_ATTR_DHCPV6_PD_MIN_LEN,
        IFACE_ATTR_DHCPV6_NA,
        IFACE_ATTR_DHCPV6_HOSTID_LEN,
        IFACE_ATTR_RA_DEFAULT,
@@ -116,6 +119,7 @@ static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
        [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
        [IFACE_ATTR_DHCPV6_ASSIGNALL] = { .name ="dhcpv6_assignall", .type = BLOBMSG_TYPE_BOOL },
        [IFACE_ATTR_DHCPV6_PD] = { .name = "dhcpv6_pd", .type = BLOBMSG_TYPE_BOOL },
+       [IFACE_ATTR_DHCPV6_PD_MIN_LEN] = { .name = "dhcpv6_pd_min_len", .type = BLOBMSG_TYPE_INT32 },
        [IFACE_ATTR_DHCPV6_NA] = { .name = "dhcpv6_na", .type = BLOBMSG_TYPE_BOOL },
        [IFACE_ATTR_DHCPV6_HOSTID_LEN] = { .name = "dhcpv6_hostidlength", .type = BLOBMSG_TYPE_INT32 },
        [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
@@ -214,6 +218,7 @@ static void set_interface_defaults(struct interface *iface)
        iface->dhcpv4_end.s_addr = htonl(START_DEFAULT + LIMIT_DEFAULT - 1);
        iface->dhcpv6_assignall = true;
        iface->dhcpv6_pd = true;
+       iface->dhcpv6_pd_min_len = 0;
        iface->dhcpv6_na = true;
        iface->dhcpv6_hostid_len = HOSTID_LEN_DEFAULT;
        iface->dns_service = true;
@@ -851,6 +856,15 @@ int config_parse_interface(void *data, size_t len, const char *name, bool overwr
        if ((c = tb[IFACE_ATTR_DHCPV6_PD]))
                iface->dhcpv6_pd = blobmsg_get_bool(c);
 
+       if ((c = tb[IFACE_ATTR_DHCPV6_PD_MIN_LEN])) {
+               uint32_t pd_min_len = blobmsg_get_u32(c);
+               if (pd_min_len != 0 && pd_min_len <= PD_MIN_LEN_MAX)
+                       iface->dhcpv6_pd_min_len = pd_min_len;
+               else
+                       syslog(LOG_ERR, "Invalid %s value configured for interface '%s'",
+                              iface_attrs[IFACE_ATTR_DHCPV6_PD_MIN_LEN].name, iface->name);
+       }
+
        if ((c = tb[IFACE_ATTR_DHCPV6_NA]))
                iface->dhcpv6_na = blobmsg_get_bool(c);