1 files changed, 59 insertions, 0 deletions
diff --git a/src/daemon/forward-linux.c b/src/daemon/forward-linux.c
new file mode 100644
index 0000000..6308445
--- /dev/null
+++ b/src/daemon/forward-linux.c
@@ -0,0 +1,59 @@
+/* -*- mode: c; c-file-style: "openbsd" -*- */
+/*
+ * Copyright (c) 2013 Vincent Bernat <bernat@luffy.cx>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "lldpd.h"
+
+#include <unistd.h>
+
+static int
+ip_forwarding_enabled(int af)
+{
+	int fd, rc = -1;
+	const char *fname;
+	char status;
+
+	if (af == LLDPD_AF_IPV4)
+		fname = PROCFS_SYS_NET "ipv4/ip_forward";
+	else if (af == LLDPD_AF_IPV6)
+		fname = PROCFS_SYS_NET "ipv6/conf/all/forwarding";
+	else
+		return -1;
+
+	if ((fd = priv_open(fname)) < 0) return -1;
+
+	if (read(fd, &status, 1) == 1) rc = (status == '1');
+
+	close(fd);
+	return rc;
+}
+
+int
+interfaces_routing_enabled(struct lldpd *cfg)
+{
+	(void)cfg;
+	int rc;
+
+	rc = ip_forwarding_enabled(LLDPD_AF_IPV4);
+	/*
+	 * Report being a router if IPv4 forwarding is enabled.
+	 * In case of error also stop the execution right away.
+	 * If IPv4 forwarding is disabled we'll check the IPv6 status.
+	 */
+	if (rc != 0) return rc;
+
+	return ip_forwarding_enabled(LLDPD_AF_IPV6);
+}