bgpd: Display link bandwidth extended community

Additional extended community definitions and display of link-bandwidth
extended community.

Signed-off-by: Vivek Venkatraman <vivek@cumulusnetworks.com>

diff --git a/bgpd/bgp_ecommunity.c b/bgpd/bgp_ecommunity.c
index fc66494742255549377eade7ef5d0a3cc3e10aa5..5e5a32d420cb4c1f228d351b81cc4e977872d4d2 100644 (file)
--- a/bgpd/bgp_ecommunity.c
+++ b/bgpd/bgp_ecommunity.c
@@ -611,6 +611,33 @@ static int ecommunity_rt_soo_str(char *buf, size_t bufsz, const uint8_t *pnt,
        return len;
 }
 
+static int ecommunity_lb_str(char *buf, size_t bufsz, const uint8_t *pnt)
+{
+       int len = 0;
+       as_t as;
+       uint32_t bw;
+       char bps_buf[20] = {0};
+
+#define ONE_GBPS_BYTES (1000 * 1000 * 1000 / 8)
+#define ONE_MBPS_BYTES (1000 * 1000 / 8)
+#define ONE_KBPS_BYTES (1000 / 8)
+
+       as = (*pnt++ << 8);
+       as |= (*pnt++);
+       pnt = ptr_get_be32(pnt, &bw);
+       if (bw >= ONE_GBPS_BYTES)
+               sprintf(bps_buf, "%.3f Gbps", (float)(bw/ONE_GBPS_BYTES));
+       else if (bw >= ONE_MBPS_BYTES)
+               sprintf(bps_buf, "%.3f Mbps", (float)(bw/ONE_MBPS_BYTES));
+       else if (bw >= ONE_KBPS_BYTES)
+               sprintf(bps_buf, "%.3f Kbps", (float)(bw/ONE_KBPS_BYTES));
+       else
+               sprintf(bps_buf, "%u bps", bw * 8);
+
+       len = snprintf(buf, bufsz, "LB:%u:%u (%s)", as, bw, bps_buf);
+       return len;
+}
+
 /* Convert extended community attribute to string.
 
    Due to historical reason of industry standard implementation, there
@@ -686,6 +713,11 @@ char *ecommunity_ecom2str(struct ecommunity *ecom, int format, int filter)
                                                  INET_ADDRSTRLEN);
                                        snprintf(encbuf, sizeof(encbuf),
                                                 "NH:%s:%d", ipv4str, pnt[5]);
+                               } else if (sub_type ==
+                                          ECOMMUNITY_LINK_BANDWIDTH &&
+                                          type == ECOMMUNITY_ENCODE_AS) {
+                                       ecommunity_lb_str(encbuf,
+                                               sizeof(encbuf), pnt);
                                } else
                                        unk_ecom = 1;
                        } else {
@@ -821,6 +853,12 @@ char *ecommunity_ecom2str(struct ecommunity *ecom, int format, int filter)
                                        (uint8_t)mac.octet[5]);
                        } else
                                unk_ecom = 1;
+               } else if (type == ECOMMUNITY_ENCODE_AS_NON_TRANS) {
+                       sub_type = *pnt++;
+                       if (sub_type == ECOMMUNITY_LINK_BANDWIDTH)
+                               ecommunity_lb_str(encbuf, sizeof(encbuf), pnt);
+                       else
+                               unk_ecom = 1;
                } else {
                        sub_type = *pnt++;
                        unk_ecom = 1;

diff --git a/bgpd/bgp_ecommunity.h b/bgpd/bgp_ecommunity.h
index d4f75d4a083146d700ba19b8b7efc947a70863f9..b61deba922d5cd4d82b51229d6276098a58f818b 100644 (file)
--- a/bgpd/bgp_ecommunity.h
+++ b/bgpd/bgp_ecommunity.h
@@ -24,19 +24,33 @@
 #include "bgpd/bgp_route.h"
 #include "bgpd/bgpd.h"
 
+/* Refer to rfc7153 for the IANA registry definitions. These are
+ * updated by other standards like rfc7674.
+ */
 /* High-order octet of the Extended Communities type field.  */
 #define ECOMMUNITY_ENCODE_AS                0x00
 #define ECOMMUNITY_ENCODE_IP                0x01
 #define ECOMMUNITY_ENCODE_AS4               0x02
 #define ECOMMUNITY_ENCODE_OPAQUE            0x03
 #define ECOMMUNITY_ENCODE_EVPN              0x06
-#define ECOMMUNITY_ENCODE_TRANS_EXP         0x80 /* Flow Spec */
 #define ECOMMUNITY_ENCODE_REDIRECT_IP_NH    0x08 /* Flow Spec */
+/* Generic Transitive Experimental */
+#define ECOMMUNITY_ENCODE_TRANS_EXP         0x80
+
 /* RFC7674 */
 #define ECOMMUNITY_EXTENDED_COMMUNITY_PART_2 0x81
 #define ECOMMUNITY_EXTENDED_COMMUNITY_PART_3 0x82
 
+/* Non-transitive extended community types. */
+#define ECOMMUNITY_ENCODE_AS_NON_TRANS      0x40
+#define ECOMMUNITY_ENCODE_IP_NON_TRANS      0x41
+#define ECOMMUNITY_ENCODE_AS4_NON_TRANS     0x42
+#define ECOMMUNITY_ENCODE_OPAQUE_NON_TRANS  0x43
+
 /* Low-order octet of the Extended Communities type field.  */
+/* Note: This really depends on the high-order octet. This means that
+ * multiple definitions for the same value are possible.
+ */
 #define ECOMMUNITY_ROUTE_TARGET             0x02
 #define ECOMMUNITY_SITE_ORIGIN              0x03
 #define ECOMMUNITY_LINK_BANDWIDTH           0x04