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 <[email protected]>
5 * Written by Matus Marhefka <[email protected]>
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
30 static struct {
31 struct nlmsghdr nh;
32 struct ifinfomsg ifi;
33 char attrbuf[512];
34 } req;
35
36
get_intf_index_from_name(const char * intf_name)37 static 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
main(int argc,char ** argv)55 int 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