1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Copyright (c) 2015 Red Hat, Inc.
3 * Copyright (c) Linux Test Project, 2015-2022
4 * Copyright (c) 2023 Petr Vorel <pvorel@suse.cz>
5 * Written by Matus Marhefka <mmarhefk@redhat.com>
6 */
7
8/*\
9 * [Description]
10 *
11 * Moves a network interface to the namespace of a process specified by a PID.
12 */
13
14#include "config.h"
15
16#define TST_NO_DEFAULT_MAIN
17#include "tst_test.h"
18#include "tst_safe_macros.h"
19#include "tst_safe_net.h"
20
21#include <linux/if.h>
22#include <linux/rtnetlink.h>
23#include <net/ethernet.h>
24#include <stdio.h>
25#include <stdlib.h>
26#include <string.h>
27
28#ifdef HAVE_DECL_IFLA_NET_NS_PID
29
30static struct {
31	struct nlmsghdr nh;
32	struct ifinfomsg ifi;
33	char attrbuf[512];
34} req;
35
36
37static int get_intf_index_from_name(const char *intf_name)
38{
39	struct ifreq ifr;
40	int sock_fd;
41
42	memset(&ifr, 0, sizeof(ifr));
43	strncpy(ifr.ifr_name, intf_name, sizeof(ifr.ifr_name) - 1);
44	ifr.ifr_name[sizeof(ifr.ifr_name)-1] = '\0';
45
46	sock_fd = SAFE_SOCKET(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
47
48	/* interface index */
49	SAFE_IOCTL(sock_fd, SIOCGIFINDEX, &ifr);
50	SAFE_CLOSE(sock_fd);
51
52	return ifr.ifr_ifindex;
53}
54
55int main(int argc, char **argv)
56{
57	struct rtattr *rta;
58	int intf_index, pid, rtnetlink_socket;
59
60	if (argc != 3) {
61		printf("tst_ns_ifmove <INTERFACE_NAME> <NAMESPACE_PID>\n");
62		return 1;
63	}
64
65	intf_index = get_intf_index_from_name(argv[1]);
66	pid = atoi(argv[2]);
67	rtnetlink_socket = SAFE_SOCKET(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
68
69	memset(&req, 0, sizeof(req));
70	req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
71	req.nh.nlmsg_flags = NLM_F_REQUEST;
72	req.nh.nlmsg_type = RTM_NEWLINK;
73	req.ifi.ifi_family = AF_UNSPEC;
74	req.ifi.ifi_index = intf_index;
75	req.ifi.ifi_change = 0xffffffff;
76	rta = (struct rtattr *)(((char *) &req) +
77		NLMSG_ALIGN(req.nh.nlmsg_len));
78	rta->rta_type = IFLA_NET_NS_PID;
79	rta->rta_len = RTA_LENGTH(sizeof(int));
80	req.nh.nlmsg_len = NLMSG_ALIGN(req.nh.nlmsg_len) +
81		RTA_LENGTH(sizeof(pid));
82	memcpy(RTA_DATA(rta), &pid, sizeof(pid));
83
84	SAFE_SEND(1, rtnetlink_socket, &req, req.nh.nlmsg_len, 0);
85	SAFE_CLOSE(rtnetlink_socket);
86
87	return 0;
88}
89
90#else
91	TST_TEST_TCONF("IFLA_NET_NS_PID not defined in linux/if_link.h");
92#endif
93