bgpd,lib,sharpd,zebra: srv6 introduce multiple segs/SIDs in nexthop

Append zebra and lib to use muliple SRv6 segs SIDs, and keep one
seg SID for bgpd and sharpd.

Note: bgpd and sharpd compilation relies on the lib and zebra files,
i.e if we separate this: lib or zebra or bgpd or sharpd in different
commits - this will not compile.

Signed-off-by: Dmytro Shytyi <dmytro.shytyi@6wind.com>

1 files changed, 24 insertions, 5 deletions

diff --git a/lib/srv6.h b/lib/srv6.h
index 7c8c6b4a65..fb34f861c8 100644
--- a/lib/srv6.h
+++ b/lib/srv6.h
@@ -14,8 +14,11 @@
 #include <arpa/inet.h>
 #include <netinet/in.h>
 
-#define SRV6_MAX_SIDS 16
+#define SRV6_MAX_SIDS	  16
+#define SRV6_MAX_SEGS	  8
 #define SRV6_LOCNAME_SIZE 256
+#define SRH_BASE_HEADER_LENGTH 8
+#define SRH_SEGMENT_LENGTH     16
 
 #ifdef __cplusplus
 extern "C" {
@@ -74,6 +77,8 @@ enum seg6local_flavor_op {
 	ZEBRA_SEG6_LOCAL_FLV_OP_NEXT_CSID    = 4,
 };
 
+#define SRV6_SEG_STRLEN 1024
+
 struct seg6_segs {
 	size_t num_segs;
 	struct in6_addr segs[256];
@@ -89,6 +94,11 @@ struct seg6local_flavors_info {
 	uint8_t lcnode_func_len;
 };
 
+struct seg6_seg_stack {
+	uint8_t num_segs;
+	struct in6_addr seg[0]; /* 1 or more segs */
+};
+
 struct seg6local_context {
 	struct in_addr nh4;
 	struct in6_addr nh6;
@@ -170,7 +180,7 @@ struct nexthop_srv6 {
 	struct seg6local_context seg6local_ctx;
 
 	/* SRv6 Headend-behaviour */
-	struct in6_addr seg6_segs;
+	struct seg6_seg_stack *seg6_segs;
 };
 
 static inline const char *seg6_mode2str(enum seg6_mode_t mode)
@@ -206,12 +216,21 @@ static inline bool sid_diff(
 	return !sid_same(a, b);
 }
 
-static inline bool sid_zero(
-		const struct in6_addr *a)
+
+static inline bool sid_zero(const struct seg6_seg_stack *a)
+{
+	struct in6_addr zero = {};
+
+	assert(a);
+
+	return sid_same(&a->seg[0], &zero);
+}
+
+static inline bool sid_zero_ipv6(const struct in6_addr *a)
 {
 	struct in6_addr zero = {};
 
-	return sid_same(a, &zero);
+	return sid_same(&a[0], &zero);
 }
 
 static inline void *sid_copy(struct in6_addr *dst,