From b85ecd30a935455ac39347eb9fb2192f661354dc Mon Sep 17 00:00:00 2001
From: Carmine Scarpitta <carmine.scarpitta@uniroma2.it>
Date: Thu, 2 Feb 2023 11:20:44 +0100
Subject: [PATCH] isisd: Add SRv6 Capabilities Sub-TLV to the LSPs

Add SRv6 Capabilities Sub-TLV to the Router Capabilities TLV in the LSPs
generated with the `lsp_build()` function.

Signed-off-by: Carmine Scarpitta <carmine.scarpitta@uniroma2.it>
---
 isisd/isis_lsp.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/isisd/isis_lsp.c b/isisd/isis_lsp.c
index 950d5f359c..f667f30e48 100644
--- a/isisd/isis_lsp.c
+++ b/isisd/isis_lsp.c
@@ -1210,6 +1210,14 @@ static void lsp_build(struct isis_lsp *lsp, struct isis_area *area)
 			/* And finally MSD */
 			rcap->msd = srdb->config.msd;
 		}
+
+		/* Add SRv6 Sub-TLVs if SRv6 is enabled */
+		if (area->srv6db.config.enabled) {
+			rcap->srv6_cap.is_srv6_capable = true;
+
+			/* SRv6 flags */
+			rcap->srv6_cap.flags = 0;
+		}
 	}
 
 	/* IPv4 address and TE router ID TLVs.