1/* Copyright (c) 2015 Red Hat, Inc.
2 *
3 * This program is free software: you can redistribute it and/or modify
4 * it under the terms of version 2 the GNU General Public License as
5 * published by the Free Software Foundation.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
14 *
15 * Written by Matus Marhefka <mmarhefk@redhat.com>
16 *
17 ***********************************************************************
18 * Moves a network interface to the namespace of a process specified by a PID.
19 *
20 */
21
22#define _GNU_SOURCE
23#include <stdlib.h>
24#include <string.h>
25#include <errno.h>
26#include <unistd.h>
27#include <asm/types.h>
28#include <sys/socket.h>
29#include <linux/rtnetlink.h>
30#include <sys/ioctl.h>
31#include <linux/if.h>
32#include <net/ethernet.h>
33#include <arpa/inet.h>
34#include "test.h"
35
36#include "config.h"
37
38char *TCID = "ns_ifmove";
39
40#if HAVE_DECL_IFLA_NET_NS_PID
41
42struct {
43	struct nlmsghdr nh;
44	struct ifinfomsg ifi;
45	char attrbuf[512];
46} req;
47
48
49int get_intf_index_from_name(const char *intf_name)
50{
51	struct ifreq ifr;
52	int sock_fd;
53
54	memset(&ifr, 0, sizeof(ifr));
55	strncpy(ifr.ifr_name, intf_name, sizeof(ifr.ifr_name) - 1);
56	ifr.ifr_name[sizeof(ifr.ifr_name)-1] = '\0';
57
58	sock_fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
59	if (sock_fd == -1) {
60		tst_resm(TINFO | TERRNO, "socket");
61		return -1;
62	}
63
64	/* gets interface index */
65	if (ioctl(sock_fd, SIOCGIFINDEX, &ifr) == -1) {
66		tst_resm(TINFO | TERRNO, "ioctl");
67		close(sock_fd);
68		return -1;
69	}
70
71	close(sock_fd);
72	return ifr.ifr_ifindex;
73}
74
75/*
76 * ./ns_ifmove <INTERFACE_NAME> <NAMESPACE_PID>
77 */
78int main(int argc, char **argv)
79{
80	struct rtattr *rta;
81	int intf_index, pid, rtnetlink_socket;
82
83	if (argc != 3) {
84		tst_resm(TINFO, "%s <INTERFACE_NAME> <NAMESPACE_PID>\n",
85			 argv[0]);
86		return 1;
87	}
88
89	intf_index = get_intf_index_from_name(argv[1]);
90	if (intf_index == -1) {
91		tst_resm(TINFO , "unable to get interface index");
92		return 1;
93	}
94
95	pid = atoi(argv[2]);
96
97	rtnetlink_socket = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
98	if (rtnetlink_socket == -1) {
99		tst_resm(TINFO | TERRNO, "socket");
100		return 1;
101	}
102
103	memset(&req, 0, sizeof(req));
104	req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
105	req.nh.nlmsg_flags = NLM_F_REQUEST;
106	req.nh.nlmsg_type = RTM_NEWLINK;
107	req.ifi.ifi_family = AF_UNSPEC;
108	req.ifi.ifi_index = intf_index;
109	req.ifi.ifi_change = 0xffffffff;
110	rta = (struct rtattr *)(((char *) &req) +
111		NLMSG_ALIGN(req.nh.nlmsg_len));
112	rta->rta_type = IFLA_NET_NS_PID;
113	rta->rta_len = RTA_LENGTH(sizeof(int));
114	req.nh.nlmsg_len = NLMSG_ALIGN(req.nh.nlmsg_len) +
115		RTA_LENGTH(sizeof(pid));
116	memcpy(RTA_DATA(rta), &pid, sizeof(pid));
117
118	if (send(rtnetlink_socket, &req, req.nh.nlmsg_len, 0) == -1) {
119		tst_resm(TINFO | TERRNO, "send");
120		return 1;
121	}
122
123	close(rtnetlink_socket);
124	return 0;
125}
126
127#else
128
129int main(void)
130{
131	tst_brkm(TCONF, NULL, "IFLA_NET_NS_PID not defined in linux/if_link.h");
132}
133
134#endif
135