isisd: Add MTID when packing SRv6 Locator TLV

The SRv6 Locator TLV (RFC 9352 section sonic-net#7.1) starts with the MTID field. Let's put the MTID as the first field when we are packing an SRv6 Locator TLV. Signed-off-by: Carmine Scarpitta <[email protected]>
marcosfsch · Sep 11, 2023 · cb55a1b · cb55a1b
1 parent f5466cc
commit cb55a1b
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/isisd/isis_tlvs.c b/isisd/isis_tlvs.c
@@ -5238,6 +5238,14 @@ static int pack_items_(uint16_t mtid, enum isis_tlv_context context,
 		stream_putw(s, mtid);
 	}
 
+	/* The SRv6 Locator TLV (RFC 9352 section #7.1) starts with the MTID
+	 * field */
+	if (context == ISIS_CONTEXT_LSP && type == ISIS_TLV_SRV6_LOCATOR) {
+		if (STREAM_WRITEABLE(s) < 2)
+			goto too_long;
+		stream_putw(s, mtid);
+	}
+
 	if (context == ISIS_CONTEXT_LSP && type == ISIS_TLV_OLDSTYLE_REACH) {
 		if (STREAM_WRITEABLE(s) < 1)
 			goto too_long;