1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2025, Muhammad Saheed <saheed@FreeBSD.org>
5 */
6
7 #include <netlink/netlink.h>
8 #include <netlink/netlink_snl.h>
9 #include <netlink/route/common.h>
10 #include <netlink/route/interface.h>
11
12 #include "libifconfig.h"
13 #include "libifconfig_internal.h"
14
15 static int ifconfig_modify_flags(ifconfig_handle_t *h, const char *ifname,
16 int ifi_flags, int ifi_change);
17
18 static int
ifconfig_modify_flags(ifconfig_handle_t * h,const char * ifname,int ifi_flags,int ifi_change)19 ifconfig_modify_flags(ifconfig_handle_t *h, const char *ifname, int ifi_flags,
20 int ifi_change)
21 {
22 int ret = 0;
23 struct snl_state ss;
24 struct snl_writer nw;
25 struct nlmsghdr *hdr;
26 struct ifinfomsg *ifi;
27 struct snl_errmsg_data e = { 0 };
28
29 if (!snl_init(&ss, NETLINK_ROUTE)) {
30 ifconfig_error(h, NETLINK, ENOTSUP);
31 return (-1);
32 }
33
34 snl_init_writer(&ss, &nw);
35 hdr = snl_create_msg_request(&nw, NL_RTM_NEWLINK);
36 ifi = snl_reserve_msg_object(&nw, struct ifinfomsg);
37 snl_add_msg_attr_string(&nw, IFLA_IFNAME, ifname);
38
39 ifi->ifi_flags = ifi_flags;
40 ifi->ifi_change = ifi_change;
41
42 hdr = snl_finalize_msg(&nw);
43 if (hdr == NULL) {
44 ifconfig_error(h, NETLINK, ENOMEM);
45 ret = -1;
46 goto out;
47 }
48
49 if (!snl_send_message(&ss, hdr)) {
50 ifconfig_error(h, NETLINK, EIO);
51 ret = -1;
52 goto out;
53 }
54
55 if (!snl_read_reply_code(&ss, hdr->nlmsg_seq, &e)) {
56 ifconfig_error(h, NETLINK, e.error);
57 ret = -1;
58 goto out;
59 }
60
61 out:
62 snl_free(&ss);
63 return (ret);
64 }
65
66 int
ifconfig_set_up(ifconfig_handle_t * h,const char * ifname,bool up)67 ifconfig_set_up(ifconfig_handle_t *h, const char *ifname, bool up)
68 {
69 int flag = up ? IFF_UP : ~IFF_UP;
70
71 return (ifconfig_modify_flags(h, ifname, flag, IFF_UP));
72 }
73