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libifconfig: Add netlink based helper to bring the interface up/down

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Adds `ifconfig_set_up()` to set and unset the `IFF_UP`
on a network interface using `RTM_NEWLINK`.

Sponsored by:	Google LLC (GSoC)
Reviewed by:	obiwac, mckusick (mentor), kp
Approved by:	obiwac, mckusick (mentor), kp
Differential Revision:	https://reviews.freebsd.org/D52128
This commit is contained in:
Muhammad Saheed 2025-08-29 17:36:10 +02:00 • committed by Aymeric Wibo
parent 6e6febb54d
commit 94ed4c1903
No known key found for this signature in database
GPG key ID: 4CC540EC0B39382D
3 changed files with 84 additions and 0 deletions
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1
lib/libifconfig/Makefile
View file

@ -17,6 +17,7 @@ SRCS= libifconfig.c \
libifconfig_internal.c \
libifconfig_lagg.c \
libifconfig_media.c \
libifconfig_nl.c \
libifconfig_sfp.c
GEN= libifconfig_sfp_tables.h \

11
lib/libifconfig/libifconfig.h
View file

@ -35,6 +35,8 @@
#include <netinet/ip_carp.h>
#include <netinet6/in6_var.h>
#include <stdbool.h>
#define ND6_IFF_DEFAULTIF 0x8000
typedef enum {
@ -381,3 +383,12 @@ int ifconfig_set_vlantag(ifconfig_handle_t *h, const char *name,
* length of *lenp * IFNAMSIZ bytes.
*/
int ifconfig_list_cloners(ifconfig_handle_t *h, char **bufp, size_t *lenp);
/** Brings the interface up/down
* @param h An open ifconfig state object
* @param ifname The interface name
* @param up true to bring the interface up, false to bring it down
* @return 0 on success, nonzero on failure.
* On failure, the error info on the handle is set.
*/
int ifconfig_set_up(ifconfig_handle_t *h, const char *ifname, bool up);

72
lib/libifconfig/libifconfig_nl.c Normal file
View file

@ -0,0 +1,72 @@
/*-
* 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_set_up(ifconfig_handle_t *h, const char *ifname, bool up)
{
int flag = up ? IFF_UP : ~IFF_UP;
return (ifconfig_modify_flags(h, ifname, flag, IFF_UP));
}