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135 lines
3.1 KiB
135 lines
3.1 KiB
/* Copyright (c) 2015 Red Hat, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of version 2 the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Written by Matus Marhefka <mmarhefk@redhat.com>
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*
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***********************************************************************
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* Moves a network interface to the namespace of a process specified by a PID.
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*
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*/
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#define _GNU_SOURCE
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <asm/types.h>
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#include <sys/socket.h>
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#include <linux/rtnetlink.h>
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#include <sys/ioctl.h>
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#include <linux/if.h>
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#include <net/ethernet.h>
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#include <arpa/inet.h>
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#include "test.h"
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#include "config.h"
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char *TCID = "ns_ifmove";
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#if HAVE_DECL_IFLA_NET_NS_PID
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struct {
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struct nlmsghdr nh;
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struct ifinfomsg ifi;
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char attrbuf[512];
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} req;
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int get_intf_index_from_name(const char *intf_name)
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{
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struct ifreq ifr;
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int sock_fd;
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, intf_name, sizeof(ifr.ifr_name) - 1);
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ifr.ifr_name[sizeof(ifr.ifr_name)-1] = '\0';
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sock_fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
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if (sock_fd == -1) {
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tst_resm(TINFO | TERRNO, "socket");
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return -1;
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}
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/* gets interface index */
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if (ioctl(sock_fd, SIOCGIFINDEX, &ifr) == -1) {
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tst_resm(TINFO | TERRNO, "ioctl");
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close(sock_fd);
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return -1;
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}
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close(sock_fd);
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return ifr.ifr_ifindex;
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}
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/*
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* ./ns_ifmove <INTERFACE_NAME> <NAMESPACE_PID>
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*/
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int main(int argc, char **argv)
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{
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struct rtattr *rta;
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int intf_index, pid, rtnetlink_socket;
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if (argc != 3) {
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tst_resm(TINFO, "%s <INTERFACE_NAME> <NAMESPACE_PID>\n",
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argv[0]);
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return 1;
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}
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intf_index = get_intf_index_from_name(argv[1]);
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if (intf_index == -1) {
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tst_resm(TINFO , "unable to get interface index");
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return 1;
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}
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pid = atoi(argv[2]);
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rtnetlink_socket = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
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if (rtnetlink_socket == -1) {
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tst_resm(TINFO | TERRNO, "socket");
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return 1;
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}
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memset(&req, 0, sizeof(req));
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req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
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req.nh.nlmsg_flags = NLM_F_REQUEST;
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req.nh.nlmsg_type = RTM_NEWLINK;
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req.ifi.ifi_family = AF_UNSPEC;
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req.ifi.ifi_index = intf_index;
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req.ifi.ifi_change = 0xffffffff;
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rta = (struct rtattr *)(((char *) &req) +
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NLMSG_ALIGN(req.nh.nlmsg_len));
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rta->rta_type = IFLA_NET_NS_PID;
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rta->rta_len = RTA_LENGTH(sizeof(int));
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req.nh.nlmsg_len = NLMSG_ALIGN(req.nh.nlmsg_len) +
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RTA_LENGTH(sizeof(pid));
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memcpy(RTA_DATA(rta), &pid, sizeof(pid));
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if (send(rtnetlink_socket, &req, req.nh.nlmsg_len, 0) == -1) {
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tst_resm(TINFO | TERRNO, "send");
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return 1;
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}
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close(rtnetlink_socket);
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return 0;
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}
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#else
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int main(void)
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{
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tst_brkm(TCONF, NULL, "IFLA_NET_NS_PID not defined in linux/if_link.h");
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}
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#endif
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