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
38 char *TCID = "ns_ifmove";
39
40 #if HAVE_DECL_IFLA_NET_NS_PID
41
42 struct {
43 struct nlmsghdr nh;
44 struct ifinfomsg ifi;
45 char attrbuf[512];
46 } req;
47
48
get_intf_index_from_name(const char * intf_name)49 int 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 */
main(int argc,char ** argv)78 int 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
main(void)129 int main(void)
130 {
131 tst_brkm(TCONF, NULL, "IFLA_NET_NS_PID not defined in linux/if_link.h");
132 }
133
134 #endif
135