src/confd: add support for ietf-ip:ipv4/forwarding

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

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.
  */

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_ */

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);