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diff --git a/lib/libifconfig/Makefile b/lib/libifconfig/Makefile
--- a/lib/libifconfig/Makefile
+++ b/lib/libifconfig/Makefile
@@ -18,6 +18,7 @@
libifconfig_internal.c \
libifconfig_lagg.c \
libifconfig_media.c \
+ libifconfig_nl.c \
libifconfig_sfp.c
GEN= libifconfig_sfp_tables.h \
diff --git a/lib/libifconfig/libifconfig.h b/lib/libifconfig/libifconfig.h
--- a/lib/libifconfig/libifconfig.h
+++ b/lib/libifconfig/libifconfig.h
@@ -382,3 +382,19 @@
* length of *lenp * IFNAMSIZ bytes.
*/
int ifconfig_list_cloners(ifconfig_handle_t *h, char **bufp, size_t *lenp);
+
+/** Brings the interface up
+ * @param h An open ifconfig state object
+ * @param ifname The interface name
+ * @return 0 on success, nonzero on failure.
+ * On failure, the error info on the handle is set.
+ */
+int ifconfig_if_up(ifconfig_handle_t *h, const char *ifname);
+
+/** Brings the interface down
+ * @param h An open ifconfig state object
+ * @param ifname The interface name
+ * @return 0 on success, nonzero on failure.
+ * On failure, the error info on the handle is set.
+ */
+int ifconfig_if_down(ifconfig_handle_t *h, const char *ifname);
diff --git a/lib/libifconfig/libifconfig_nl.c b/lib/libifconfig/libifconfig_nl.c
new file mode 100644
--- /dev/null
+++ b/lib/libifconfig/libifconfig_nl.c
@@ -0,0 +1,76 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2025, Muhammad Saheed <saheed@FreeBSD.org>
+ */
+
+#include <netlink/netlink.h>
+#include <netlink/netlink_snl.h>
+#include <netlink/route/common.h>
+#include <netlink/route/interface.h>
+
+#include "libifconfig.h"
+#include "libifconfig_internal.h"
+
+static int ifconfig_modify_flags(ifconfig_handle_t *h, const char *ifname,
+ int ifi_flags, int ifi_change);
+
+static int
+ifconfig_modify_flags(ifconfig_handle_t *h, const char *ifname, int ifi_flags,
+ int ifi_change)
+{
+ int ret = 0;
+ struct snl_state ss;
+ struct snl_writer nw;
+ struct nlmsghdr *hdr;
+ struct ifinfomsg *ifi;
+ struct snl_errmsg_data e = { 0 };
+
+ if (!snl_init(&ss, NETLINK_ROUTE)) {
+ ifconfig_error(h, NETLINK, ENOTSUP);
+ return (-1);
+ }
+
+ snl_init_writer(&ss, &nw);
+ hdr = snl_create_msg_request(&nw, NL_RTM_NEWLINK);
+ ifi = snl_reserve_msg_object(&nw, struct ifinfomsg);
+ snl_add_msg_attr_string(&nw, IFLA_IFNAME, ifname);
+
+ ifi->ifi_flags = ifi_flags;
+ ifi->ifi_change = ifi_change;
+
+ hdr = snl_finalize_msg(&nw);
+ if (hdr == NULL) {
+ ifconfig_error(h, NETLINK, ENOMEM);
+ ret = -1;
+ goto out;
+ }
+
+ if (!snl_send_message(&ss, hdr)) {
+ ifconfig_error(h, NETLINK, EIO);
+ ret = -1;
+ goto out;
+ }
+
+ if (!snl_read_reply_code(&ss, hdr->nlmsg_seq, &e)) {
+ ifconfig_error(h, NETLINK, e.error);
+ ret = -1;
+ goto out;
+ }
+
+out:
+ snl_free(&ss);
+ return (ret);
+}
+
+int
+ifconfig_if_up(ifconfig_handle_t *h, const char *ifname)
+{
+ return (ifconfig_modify_flags(h, ifname, IFF_UP, IFF_UP));
+}
+
+int
+ifconfig_if_down(ifconfig_handle_t *h, const char *ifname)
+{
+ return (ifconfig_modify_flags(h, ifname, ~IFF_UP, IFF_UP));
+}

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