+static bool
+parse_ip6assign_option(struct interface *iface, struct blob_attr *attr)
+{
+ uint8_t oldval = iface->proto_ip.assignment_length;
+ uint8_t newval = blobmsg_get_u32(attr);
+
+ struct device_prefix *prefix;
+ list_for_each_entry(prefix, &prefixes, head) {
+ if (oldval && oldval != newval)
+ interface_ip_set_prefix_assignment(prefix, iface, 0);
+
+ if (newval && newval <= 64)
+ interface_ip_set_prefix_assignment(prefix, iface, newval);
+ }
+
+ iface->proto_ip.assignment_length = newval;
+ return true;
+}
+
+static bool
+parse_prefix_option(struct interface *iface, const char *str, size_t len)
+{
+ char buf[128] = {0}, *saveptr;
+ if (len > sizeof(buf))
+ return false;
+
+ memcpy(buf, str, len);
+ char *addrstr = strtok_r(buf, "/", &saveptr);
+ if (!addrstr)
+ return false;
+
+ char *lengthstr = strtok_r(NULL, ",", &saveptr);
+ if (!lengthstr)
+ return false;
+
+ char *prefstr = strtok_r(NULL, ",", &saveptr);
+ char *validstr = (!prefstr) ? NULL : strtok_r(NULL, ",", &saveptr);
+
+ uint32_t pref = (!prefstr) ? 0 : strtoul(prefstr, NULL, 10);
+ uint32_t valid = (!validstr) ? 0 : strtoul(validstr, NULL, 10);
+
+ uint8_t length = strtoul(lengthstr, NULL, 10);
+ if (length < 1 || length > 64)
+ return false;
+
+ struct in6_addr addr;
+ if (inet_pton(AF_INET6, addrstr, &addr) < 1)
+ return false;
+
+ time_t now = system_get_rtime();
+ time_t preferred_until = 0;
+ if (prefstr && pref != 0xffffffffU)
+ preferred_until = pref + now;
+
+ time_t valid_until = 0;
+ if (validstr && valid != 0xffffffffU)
+ valid_until = valid + now;
+
+ interface_ip_add_device_prefix(iface, &addr, length,
+ valid_until, preferred_until);
+ return true;
+}
+
+static int
+parse_prefix_list(struct interface *iface, struct blob_attr *attr)
+{
+ struct blob_attr *cur;
+ int n_addr = 0;
+ int rem;
+
+ blobmsg_for_each_attr(cur, attr, rem) {
+ if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
+ return -1;
+
+ n_addr++;
+ if (!parse_prefix_option(iface, blobmsg_data(cur),
+ blobmsg_data_len(cur)))
+ return -1;
+ }
+
+ return n_addr;
+}
+