Merge pull request #4314 from lkrishnamoor/extract_tunnel_type_extcom

bgpd: Extract tunnel type from extended communities

bgpd/bgp_attr.c

@@ -51,7 +51,6 @@
 #include "bgp_encap_types.h"
 #include "bgp_vnc_types.h"
 #endif
-#include "bgp_encap_types.h"
 #include "bgp_evpn.h"
 #include "bgp_flowspec_private.h"
 #include "bgp_mac.h"
@@ -1957,6 +1956,10 @@ bgp_attr_ext_communities(struct bgp_attr_parser_args *args)
 
 	}
 
+	/* Get the tunnel type from encap extended community */
+	bgp_attr_extcom_tunnel_type(attr,
+		(bgp_encap_types *)&attr->encap_tunneltype);
+
 	return BGP_ATTR_PARSE_PROCEED;
 }
 
@@ -2776,6 +2779,38 @@ bgp_attr_parse_ret_t bgp_attr_parse(struct peer *peer, struct attr *attr,
 	return BGP_ATTR_PARSE_PROCEED;
 }
 
+/*
+ * Extract the tunnel type from extended community
+ */
+void bgp_attr_extcom_tunnel_type(struct attr *attr,
+					bgp_encap_types *tunnel_type)
+{
+	struct ecommunity *ecom;
+	int i;
+	if (!attr)
+		return false;
+
+	ecom = attr->ecommunity;
+	if (!ecom || !ecom->size)
+		return false;
+
+	for (i = 0; i < ecom->size; i++) {
+		uint8_t *pnt;
+		uint8_t type, sub_type;
+
+		pnt = (ecom->val + (i * ECOMMUNITY_SIZE));
+		type = pnt[0];
+		sub_type = pnt[1];
+		if (!(type == ECOMMUNITY_ENCODE_OPAQUE &&
+		      sub_type == ECOMMUNITY_OPAQUE_SUBTYPE_ENCAP))
+			continue;
+		*tunnel_type = ((pnt[6] << 8) | pnt[7]);
+		return true;
+	}
+
+	return false;
+}
+
 size_t bgp_packet_mpattr_start(struct stream *s, struct peer *peer, afi_t afi,
 			       safi_t safi, struct bpacket_attr_vec_arr *vecarr,
 			       struct attr *attr)

bgpd/bgp_attr.h

@@ -23,6 +23,7 @@
 
 #include "mpls.h"
 #include "bgp_attr_evpn.h"
+#include "bgpd/bgp_encap_types.h"
 
 /* Simple bit mapping. */
 #define BITMAP_NBBY 8
@@ -317,6 +318,9 @@ encap_tlv_dup(struct bgp_attr_encap_subtlv *orig);
 
 extern void bgp_attr_flush_encap(struct attr *attr);
 
+extern void bgp_attr_extcom_tunnel_type(struct attr *attr,
+					 bgp_encap_types *tunnel_type);
+
 /**
  * Set of functions to encode MP_REACH_NLRI and MP_UNREACH_NLRI attributes.
  * Typical call sequence is to call _start(), followed by multiple _prefix(),

bgpd/bgp_ecommunity.h

@@ -22,6 +22,7 @@
 #define _QUAGGA_BGP_ECOMMUNITY_H
 
 #include "bgpd/bgp_route.h"
+#include "bgpd/bgpd.h"
 
 /* High-order octet of the Extended Communities type field.  */
 #define ECOMMUNITY_ENCODE_AS                0x00

bgpd/rfapi/rfapi_import.c

@@ -374,42 +374,15 @@ int rfapiGetVncLifetime(struct attr *attr, uint32_t *lifetime)
 	return ENOENT;
 }
 
-/*
- * Extract the tunnel type from the extended community
- */
-int rfapiGetTunnelType(struct attr *attr, bgp_encap_types *type)
-{
-	*type = BGP_ENCAP_TYPE_MPLS; /* default to MPLS */
-	if (attr && attr->ecommunity) {
-		struct ecommunity *ecom = attr->ecommunity;
-		int i;
-
-		for (i = 0; i < (ecom->size * ECOMMUNITY_SIZE);
-		     i += ECOMMUNITY_SIZE) {
-			uint8_t *ep;
-
-			ep = ecom->val + i;
-			if (ep[0] == ECOMMUNITY_ENCODE_OPAQUE
-			    && ep[1] == ECOMMUNITY_OPAQUE_SUBTYPE_ENCAP) {
-				*type = (ep[6] << 8) + ep[7];
-				return 0;
-			}
-		}
-	}
-
-	return ENOENT;
-}
-
-
 /*
  * Look for UN address in Encap attribute
  */
 int rfapiGetVncTunnelUnAddr(struct attr *attr, struct prefix *p)
 {
 	struct bgp_attr_encap_subtlv *pEncap;
-	bgp_encap_types tun_type;
+	bgp_encap_types tun_type = BGP_ENCAP_TYPE_MPLS;/*Default tunnel type*/
 
-	rfapiGetTunnelType(attr, &tun_type);
+	bgp_attr_extcom_tunnel_type(attr, &tun_type);
 	if (tun_type == BGP_ENCAP_TYPE_MPLS) {
 		if (!p)
 			return 0;
@@ -1350,7 +1323,7 @@ rfapiRouteInfo2NextHopEntry(struct rfapi_ip_prefix *rprefix,
 	}
 
 	if (bpi->attr) {
-		bgp_encap_types tun_type;
+		bgp_encap_types tun_type = BGP_ENCAP_TYPE_MPLS; /*Default*/
 		new->prefix.cost = rfapiRfpCost(bpi->attr);
 
 		struct bgp_attr_encap_subtlv *pEncap;
@@ -1390,7 +1363,7 @@ rfapiRouteInfo2NextHopEntry(struct rfapi_ip_prefix *rprefix,
 			}
 		}
 
-		rfapiGetTunnelType(bpi->attr, &tun_type);
+		bgp_attr_extcom_tunnel_type(bpi->attr, &tun_type);
 		if (tun_type == BGP_ENCAP_TYPE_MPLS) {
 			struct prefix p;
 			/* MPLS carries UN address in next hop */

bgpd/rfapi/rfapi_private.h

@@ -306,8 +306,6 @@ extern int rfapiCliGetPrefixAddr(struct vty *vty, const char *str,
 
 extern int rfapiGetVncLifetime(struct attr *attr, uint32_t *lifetime);
 
-extern int rfapiGetTunnelType(struct attr *attr, bgp_encap_types *type);
-
 extern int rfapiGetVncTunnelUnAddr(struct attr *attr, struct prefix *p);
 
 extern int rfapi_reopen(struct rfapi_descriptor *rfd, struct bgp *bgp);

bgpd/rfapi/rfapi_vty.c

@@ -1020,7 +1020,7 @@ static int rfapiPrintRemoteRegBi(struct bgp *bgp, void *stream,
 	struct prefix pfx_vn;
 	uint8_t cost;
 	uint32_t lifetime;
-	bgp_encap_types tun_type;
+	bgp_encap_types tun_type = BGP_ENCAP_TYPE_MPLS;/*Default tunnel type*/
 
 	char buf_pfx[BUFSIZ];
 	char buf_ntop[BUFSIZ];
@@ -1055,7 +1055,7 @@ static int rfapiPrintRemoteRegBi(struct bgp *bgp, void *stream,
 				   BUFSIZ));
 	}
 
-	rfapiGetTunnelType(bpi->attr, &tun_type);
+	bgp_attr_extcom_tunnel_type(bpi->attr, &tun_type);
 	/*
 	 * VN addr
 	 */