1 files changed, 97 insertions, 0 deletions
diff --git a/bgpd/bgp_label.h b/bgpd/bgp_label.h
new file mode 100644
index 0000000..b54403e
--- /dev/null
+++ b/bgpd/bgp_label.h
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* BGP carrying Label information
+ * Copyright (C) 2013 Cumulus Networks, Inc.
+ */
+
+#ifndef _BGP_LABEL_H
+#define _BGP_LABEL_H
+
+#define BGP_LABEL_BYTES 3
+#define BGP_LABEL_BITS 24
+#define BGP_WITHDRAW_LABEL 0x800000
+#define BGP_PREVENT_VRF_2_VRF_LEAK 0xFFFFFFFE
+
+struct bgp_dest;
+struct bgp_path_info;
+struct peer;
+
+extern int bgp_reg_for_label_callback(mpls_label_t new_label, void *labelid,
+				    bool allocated);
+extern void bgp_reg_dereg_for_label(struct bgp_dest *dest,
+				    struct bgp_path_info *pi, bool reg);
+extern int bgp_parse_fec_update(void);
+extern mpls_label_t bgp_adv_label(struct bgp_dest *dest,
+				  struct bgp_path_info *pi, struct peer *to,
+				  afi_t afi, safi_t safi);
+
+extern int bgp_nlri_parse_label(struct peer *peer, struct attr *attr,
+				struct bgp_nlri *packet);
+extern bool bgp_labels_same(const mpls_label_t *tbl_a,
+			    const uint32_t num_labels_a,
+			    const mpls_label_t *tbl_b,
+			    const uint32_t num_labels_b);
+
+static inline int bgp_labeled_safi(safi_t safi)
+{
+	/* NOTE: This API really says a label (tag) MAY be present. Not all EVPN
+	 * routes will have a label.
+	 */
+	if ((safi == SAFI_LABELED_UNICAST) || (safi == SAFI_MPLS_VPN)
+	    || (safi == SAFI_EVPN))
+		return 1;
+	return 0;
+}
+
+static inline int bgp_is_withdraw_label(mpls_label_t *label)
+{
+	uint8_t *pkt = (uint8_t *)label;
+
+	/* The check on pkt[2] for 0x00 or 0x02 is in case bgp_set_valid_label()
+	 * was called on the withdraw label */
+	if (((pkt[0] == 0x80) || (pkt[0] == 0x00)) && (pkt[1] == 0x00)
+	    && ((pkt[2] == 0x00) || (pkt[2] == 0x02)))
+		return 1;
+	return 0;
+}
+
+static inline int bgp_is_valid_label(const mpls_label_t *label)
+{
+	uint8_t *t = (uint8_t *)label;
+	if (!t)
+		return 0;
+	return (t[2] & 0x02);
+}
+
+static inline void bgp_set_valid_label(mpls_label_t *label)
+{
+	uint8_t *t = (uint8_t *)label;
+	if (t)
+		t[2] |= 0x02;
+}
+
+static inline void bgp_unset_valid_label(mpls_label_t *label)
+{
+	uint8_t *t = (uint8_t *)label;
+	if (t)
+		t[2] &= ~0x02;
+}
+
+static inline void bgp_register_for_label(struct bgp_dest *dest,
+					  struct bgp_path_info *pi)
+{
+	bgp_reg_dereg_for_label(dest, pi, true);
+}
+
+static inline void bgp_unregister_for_label(struct bgp_dest *dest)
+{
+	bgp_reg_dereg_for_label(dest, NULL, false);
+}
+
+/* Return BOS value of label stream */
+static inline uint8_t label_bos(mpls_label_t *label)
+{
+	uint8_t *t = (uint8_t *)label;
+	return (t[2] & 0x01);
+};
+
+#endif /* _BGP_LABEL_H */