isisd: Add pack function for SRv6 End SID Sub-TLV

Add a function to pack an SRv6 End SID Sub-TLV (RFC 9352 section sonic-net#7.2). Signed-off-by: Carmine Scarpitta <[email protected]>
marcosfsch · Sep 11, 2023 · b38fed4 · b38fed4
1 parent 6605ccf
commit b38fed4
Showing 1 changed file with 22 additions and 0 deletions.
diff --git a/isisd/isis_tlvs.c b/isisd/isis_tlvs.c
@@ -2098,6 +2098,28 @@ static void free_item_srv6_end_sid(struct isis_item *i)
 	XFREE(MTYPE_ISIS_SUBTLV, i);
 }
 
+static int pack_item_srv6_end_sid(struct isis_item *i, struct stream *s,
+				  size_t *min_len)
+{
+	struct isis_srv6_end_sid_subtlv *sid =
+		(struct isis_srv6_end_sid_subtlv *)i;
+
+	if (STREAM_WRITEABLE(s) < 19) {
+		*min_len = 19;
+		return 1;
+	}
+
+	stream_putc(s, sid->flags);
+	stream_putw(s, sid->behavior);
+	stream_put(s, &sid->sid, IPV6_MAX_BYTELEN);
+
+	/* Put 0 as Sub-Sub-TLV length, because we don't support any Sub-Sub-TLV
+	 * at this time */
+	stream_putc(s, 0);
+
+	return 0;
+}
+
 /* Functions related to TLVs 1 Area Addresses */
 
 static struct isis_item *copy_item_area_address(struct isis_item *i)