From 2e73d643eddce0d90c8f37e91881e15d6fdfa66f Mon Sep 17 00:00:00 2001
From: Joachim Wiberg <troglobit@gmail.com>
Date: Sun, 16 Apr 2023 12:22:37 +0200
Subject: [PATCH] src/confd: add support for ietf-ip:ipv4/forwarding

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
---
 src/confd/src/helpers.c         | 20 ++++++++++++++++++++
 src/confd/src/helpers.h         |  1 +
 src/confd/src/ietf-interfaces.c |  3 +++
 3 files changed, 24 insertions(+)

diff --git a/src/confd/src/helpers.c b/src/confd/src/helpers.c
index f08fd0bf..1338c731 100644
--- a/src/confd/src/helpers.c
+++ b/src/confd/src/helpers.c
@@ -3,6 +3,26 @@
 #include <stdarg.h>
 #include "core.h"
 
+/*
+ * Write interger value to a file composed from fmt and optional args.
+ */
+int writedf(int value, const char *fmt, ...)
+{
+	va_list ap;
+	int rc = -1;
+	FILE *fp;
+
+	va_start(ap, fmt);
+	fp = fopenf("w", fmt, ap);
+	if (fp) {
+		fprintf(fp, "%d\n", value);
+		rc = fclose(fp);
+	}
+	va_end(ap);
+
+	return rc;
+}
+
 /*
  * Write str to a file composed from fmt and optional args.
  */
diff --git a/src/confd/src/helpers.h b/src/confd/src/helpers.h
index 05a2fa22..87ea93c6 100644
--- a/src/confd/src/helpers.h
+++ b/src/confd/src/helpers.h
@@ -3,6 +3,7 @@
 #ifndef CONFD_HELPERS_H_
 #define CONFD_HELPERS_H_
 
+int writedf(int value, const char *fmt, ...);
 int writesf(const char *str, const char *fmt, ...);
 
 #endif /* CONFD_HELPERS_H_ */
diff --git a/src/confd/src/ietf-interfaces.c b/src/confd/src/ietf-interfaces.c
index a9802fff..5e8aab35 100644
--- a/src/confd/src/ietf-interfaces.c
+++ b/src/confd/src/ietf-interfaces.c
@@ -61,6 +61,9 @@ static int ifchange(sr_session_ctx_t *session, uint32_t sub_id, const char *modu
 			writesf(ptr, "/sys/class/net/%s/ifalias", ifname);
 		free(ptr);
 
+		writedf(srx_enabled(session, "%s/ietf-ip:ipv4/forwarding", xpath),
+			"/proc/sys/net/ipv4/conf/%s/forwarding", ifname);
+
 		systemf("ip addr flush dev %s", ifname);
 
 		snprintf(path, sizeof(path), "%s/ietf-ip:ipv4/address", xpath);