add flag getters for prefix option

Signed-off-by: Jiri Pirko <jiri@resnulli.us>

3 files changed, 69 insertions, 0 deletions

diff --git a/include/ndp.h b/include/ndp.h
index 423181d..08d6ad4 100644
--- a/include/ndp.h
+++ b/include/ndp.h
@@ -127,6 +127,9 @@ struct in6_addr *ndp_msg_opt_prefix(struct ndp_msg *msg, int offset);
 uint8_t ndp_msg_opt_prefix_len(struct ndp_msg *msg, int offset);
 uint32_t ndp_msg_opt_prefix_valid_time(struct ndp_msg *msg, int offset);
 uint32_t ndp_msg_opt_prefix_preferred_time(struct ndp_msg *msg, int offset);
+bool ndp_msg_opt_prefix_flag_on_link(struct ndp_msg *msg, int offset);
+bool ndp_msg_opt_prefix_flag_auto_addr_conf(struct ndp_msg *msg, int offset);
+bool ndp_msg_opt_prefix_flag_router_addr(struct ndp_msg *msg, int offset);
 
 uint32_t ndp_msg_opt_mtu(struct ndp_msg *msg, int offset);
 
diff --git a/libndp/libndp.c b/libndp/libndp.c
index 20efe90..0600e59 100644
--- a/libndp/libndp.c
+++ b/libndp/libndp.c
@@ -1266,6 +1266,66 @@ uint32_t ndp_msg_opt_prefix_preferred_time(struct ndp_msg *msg, int offset)
 }
 
 /**
+ * ndp_msg_opt_prefix_flag_on_link:
+ * @msg: message structure
+ * @offset: in-message offset
+ *
+ * Get on-link flag.
+ * User should use this function only inside ndp_msg_opt_for_each_offset()
+ * macro loop.
+ *
+ * Returns: on-link flag.
+ **/
+NDP_EXPORT
+bool ndp_msg_opt_prefix_flag_on_link(struct ndp_msg *msg, int offset)
+{
+	struct nd_opt_prefix_info *pi =
+			ndp_msg_payload_opts_offset(msg, offset);
+
+	return pi->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_ONLINK;
+}
+
+/**
+ * ndp_msg_opt_prefix_flag_auto_addr_conf:
+ * @msg: message structure
+ * @offset: in-message offset
+ *
+ * Get autonomous address-configuration flag.
+ * User should use this function only inside ndp_msg_opt_for_each_offset()
+ * macro loop.
+ *
+ * Returns: autonomous address-configuration flag.
+ **/
+NDP_EXPORT
+bool ndp_msg_opt_prefix_flag_auto_addr_conf(struct ndp_msg *msg, int offset)
+{
+	struct nd_opt_prefix_info *pi =
+			ndp_msg_payload_opts_offset(msg, offset);
+
+	return pi->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_AUTO;
+}
+
+/**
+ * ndp_msg_opt_prefix_flag_router_addr:
+ * @msg: message structure
+ * @offset: in-message offset
+ *
+ * Get router address flag.
+ * User should use this function only inside ndp_msg_opt_for_each_offset()
+ * macro loop.
+ *
+ * Returns: router address flag.
+ **/
+NDP_EXPORT
+bool ndp_msg_opt_prefix_flag_router_addr(struct ndp_msg *msg, int offset)
+{
+	struct nd_opt_prefix_info *pi =
+			ndp_msg_payload_opts_offset(msg, offset);
+
+	return pi->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_RADDR;
+}
+
+/**
  * ndp_msg_opt_mtu:
  * @msg: message structure
  * @offset: in-message offset
diff --git a/utils/ndptool.c b/utils/ndptool.c
index 32b641f..d0764ce 100644
--- a/utils/ndptool.c
+++ b/utils/ndptool.c
@@ -257,6 +257,12 @@ static int msgrcv_handler_func(struct ndp *ndp, struct ndp_msg *msg, void *priv)
 				pr_out("infinity");
 			else
 				pr_out("%us", preferred_time);
+			pr_out(", on_link: %s",
+			       ndp_msg_opt_prefix_flag_on_link(msg, offset) ? "yes" : "no");
+			pr_out(", autonomous_addr_conf: %s",
+			       ndp_msg_opt_prefix_flag_auto_addr_conf(msg, offset) ? "yes" : "no");
+			pr_out(", router_addr: %s",
+			       ndp_msg_opt_prefix_flag_router_addr(msg, offset) ? "yes" : "no");
 			pr_out("\n");
 		}
 		ndp_msg_opt_for_each_offset(offset, msg, NDP_MSG_OPT_MTU)