bgpd: support for bgp ipv6 ext community, and flowspec redirect ipv6

rfc 5701 is supported. it is possible to configure in bgp vpn, a list of
route target with ipv6 external communities to import. it is to be noted
that this ipv6 external community has been developed only for matching a
bgp flowspec update with same ipv6 ext commmunity.
adding to this, draft-ietf-idr-flow-spec-v6-09 is implemented regarding
the redirect ipv6 option.

Practically, under bgp vpn, under ipv6 unicast, it is possible to
configure : [no] rt6 redirect import <IPV6>:<AS> values.

An incoming bgp update with fs ipv6 and that option matching a bgp vrf,
will be imported in that bgp vrf.

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

1 files changed, 30 insertions, 0 deletions

diff --git a/bgpd/bgp_ecommunity.h b/bgpd/bgp_ecommunity.h
index 8ae3b44bab..4a1af0d203 100644
--- a/bgpd/bgp_ecommunity.h
+++ b/bgpd/bgp_ecommunity.h
@@ -63,6 +63,10 @@
  * 0x0c Flow-spec Redirect to IPv4 - draft-ietf-idr-flowspec-redirect
  */
 #define ECOMMUNITY_FLOWSPEC_REDIRECT_IPV4   0x0c
+/* from draft-ietf-idr-flow-spec-v6-09
+ * 0x0b Flow-spec Redirect to IPv6
+ */
+#define ECOMMUNITY_FLOWSPEC_REDIRECT_IPV6   0x0b
 
 /* Low-order octet of the Extended Communities type field for EVPN types */
 #define ECOMMUNITY_EVPN_SUBTYPE_MACMOBILITY  0x00
@@ -90,6 +94,7 @@
 
 /* Extended Communities value is eight octet long.  */
 #define ECOMMUNITY_SIZE                        8
+#define IPV6_ECOMMUNITY_SIZE                   20
 
 /* Extended Communities type flag.  */
 #define ECOMMUNITY_FLAG_NON_TRANSITIVE      0x40
@@ -99,6 +104,11 @@ struct ecommunity {
 	/* Reference counter.  */
 	unsigned long refcnt;
 
+	/* Size of Each Unit of Extended Communities attribute.
+	 * to differentiate between IPv6 ext comm and ext comm
+	 */
+	int unit_size;
+
 	/* Size of Extended Communities attribute.  */
 	int size;
 
@@ -119,11 +129,23 @@ struct ecommunity_ip {
 	uint16_t val;
 };
 
+struct ecommunity_ip6 {
+	struct in6_addr ip;
+	uint16_t val;
+};
+
 /* Extended community value is eight octet.  */
 struct ecommunity_val {
 	char val[ECOMMUNITY_SIZE];
 };
 
+/* IPv6 Extended community value is eight octet.  */
+struct ecommunity_val_ipv6 {
+	char val[IPV6_ECOMMUNITY_SIZE];
+};
+
+#define ecom_length_size(X, Y)    ((X)->size * (Y))
+
 /*
  * Encode BGP Route Target AS:nn.
  */
@@ -193,6 +215,8 @@ extern void ecommunity_init(void);
 extern void ecommunity_finish(void);
 extern void ecommunity_free(struct ecommunity **);
 extern struct ecommunity *ecommunity_parse(uint8_t *, unsigned short);
+extern struct ecommunity *ecommunity_parse_ipv6(uint8_t *pnt,
+						unsigned short length);
 extern struct ecommunity *ecommunity_dup(struct ecommunity *);
 extern struct ecommunity *ecommunity_merge(struct ecommunity *,
 					   struct ecommunity *);
@@ -202,6 +226,8 @@ extern bool ecommunity_cmp(const void *arg1, const void *arg2);
 extern void ecommunity_unintern(struct ecommunity **);
 extern unsigned int ecommunity_hash_make(const void *);
 extern struct ecommunity *ecommunity_str2com(const char *, int, int);
+extern struct ecommunity *ecommunity_str2com_ipv6(const char *str, int type,
+						  int keyword_included);
 extern char *ecommunity_ecom2str(struct ecommunity *, int, int);
 extern void ecommunity_strfree(char **s);
 extern bool ecommunity_match(const struct ecommunity *,
@@ -209,9 +235,13 @@ extern bool ecommunity_match(const struct ecommunity *,
 extern char *ecommunity_str(struct ecommunity *);
 extern struct ecommunity_val *ecommunity_lookup(const struct ecommunity *,
 						uint8_t, uint8_t);
+
 extern bool ecommunity_add_val(struct ecommunity *ecom,
 			       struct ecommunity_val *eval,
 			       bool unique, bool overwrite);
+extern bool ecommunity_add_val_ipv6(struct ecommunity *ecom,
+				    struct ecommunity_val_ipv6 *eval,
+				    bool unique, bool overwrite);
 
 /* for vpn */
 extern struct ecommunity *ecommunity_new(void);