bgpd: ecommunity show bgp ipv4 flowspec

ecommunity library is modified to return the flowspec ecommunities in
display format.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

bgpd/bgp_ecommunity.c

@@ -33,6 +33,13 @@
 #include "bgpd/bgp_ecommunity.h"
 #include "bgpd/bgp_lcommunity.h"
 #include "bgpd/bgp_aspath.h"
+#include "bgpd/bgp_flowspec_private.h"
+
+/* struct used to dump the rate contained in FS set traffic-rate EC */
+union traffic_rate {
+	float rate_float;
+	uint8_t rate_byte[4];
+};
 
 /* Hash of community attribute. */
 static struct hash *ecomhash;
@@ -661,8 +668,10 @@ char *ecommunity_ecom2str(struct ecommunity *ecom, int format, int filter)
 		}
 
 		/* Space between each value.  */
-		if (!first)
+		if (!first) {
 			str_buf[str_pnt++] = ' ';
+			len++;
+		}
 
 		pnt = ecom->val + (i * 8);
 
@@ -727,6 +736,61 @@ char *ecommunity_ecom2str(struct ecommunity *ecom, int format, int filter)
 						      "MM:%u", seqnum);
 			} else
 				unk_ecom = 1;
+		} else if (type == ECOMMUNITY_ENCODE_TRANS_EXP) {
+			sub_type = *pnt++;
+
+			if (sub_type == ECOMMUNITY_TRAFFIC_ACTION) {
+				char action[64];
+				char *ptr = action;
+
+				if (*(pnt+3) ==
+				    1 << FLOWSPEC_TRAFFIC_ACTION_TERMINAL)
+					ptr += snprintf(ptr, sizeof(action),
+							"terminate (apply)");
+				else
+					ptr += snprintf(ptr, sizeof(action),
+						       "eval stops");
+				if (*(pnt+3) ==
+				    1 << FLOWSPEC_TRAFFIC_ACTION_SAMPLE)
+					snprintf(ptr, sizeof(action) -
+						 (size_t)(ptr-action),
+						 ", sample");
+				len = snprintf(str_buf + str_pnt,
+					       str_size - len,
+					      "FS:action %s", action);
+			} else if (sub_type == ECOMMUNITY_TRAFFIC_RATE) {
+				union traffic_rate data;
+
+				data.rate_byte[3] = *(pnt+2);
+				data.rate_byte[2] = *(pnt+3);
+				data.rate_byte[1] = *(pnt+4);
+				data.rate_byte[0] = *(pnt+5);
+				len = sprintf(
+					str_buf + str_pnt,
+					"FS:rate %f", data.rate_float);
+			} else if (sub_type == ECOMMUNITY_REDIRECT_VRF) {
+				char buf[16];
+
+				memset(buf, 0, sizeof(buf));
+				ecommunity_rt_soo_str(buf, (uint8_t *)pnt,
+						type &
+						~ECOMMUNITY_ENCODE_TRANS_EXP,
+						ECOMMUNITY_ROUTE_TARGET,
+						ECOMMUNITY_FORMAT_DISPLAY);
+				len = snprintf(
+					str_buf + str_pnt,
+					str_size - len,
+					"FS:redirect VRF %s", buf);
+			} else if (sub_type == ECOMMUNITY_TRAFFIC_MARKING) {
+				len = sprintf(
+					str_buf + str_pnt,
+					"FS:marking %u", *(pnt+5));
+			} else if (sub_type == ECOMMUNITY_REDIRECT_IP_NH) {
+				len = sprintf(
+					str_buf + str_pnt,
+					"FS:redirect IP 0x%x", *(pnt+5));
+			} else
+				unk_ecom = 1;
 		} else
 			unk_ecom = 1;
 

bgpd/bgp_ecommunity.h

@@ -27,10 +27,19 @@
 #define ECOMMUNITY_ENCODE_AS4               0x02
 #define ECOMMUNITY_ENCODE_OPAQUE            0x03
 #define ECOMMUNITY_ENCODE_EVPN              0x06
+#define ECOMMUNITY_ENCODE_TRANS_EXP         0x80 /* Flow Spec */
+/* RFC7674 */
+#define ECOMMUNITY_EXTENDED_COMMUNITY_PART_2 0x81
+#define ECOMMUNITY_EXTENDED_COMMUNITY_PART_3 0x82
 
 /* Low-order octet of the Extended Communities type field.  */
 #define ECOMMUNITY_ROUTE_TARGET             0x02
 #define ECOMMUNITY_SITE_ORIGIN              0x03
+#define ECOMMUNITY_TRAFFIC_RATE             0x06 /* Flow Spec */
+#define ECOMMUNITY_TRAFFIC_ACTION           0x07
+#define ECOMMUNITY_REDIRECT_VRF             0x08
+#define ECOMMUNITY_TRAFFIC_MARKING          0x09
+#define ECOMMUNITY_REDIRECT_IP_NH           0x00
 
 /* Low-order octet of the Extended Communities type field for EVPN types */
 #define ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY  0x00

bgpd/bgp_flowspec_private.h

@@ -21,4 +21,9 @@
 
 #define FLOWSPEC_NLRI_SIZELIMIT			240
 
+/* Flowspec raffic action bit*/
+#define FLOWSPEC_TRAFFIC_ACTION_TERMINAL	1
+#define FLOWSPEC_TRAFFIC_ACTION_SAMPLE		0
+#define FLOWSPEC_TRAFFIC_ACTION_DISTRIBUTE	1
+
 #endif /* _FRR_BGP_FLOWSPEC_PRIVATE_H */