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kvm tools: Set up tun interface using ioctls

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Use ioctls to assign IP address and bring interface up instead of using ifconfig.
Not breaking aliasing rules this time.

Reviewed-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Sasha Levin
2015-06-01 16:39:42 +01:00
committed by Will Deacon
parent 86835ced6d
commit cb7202c13f
1 changed files with 25 additions and 2 deletions
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virtio-net.c
+25 -2
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@@ -14,6 +14,9 @@
#include <sys/ioctl.h>
#include <assert.h>
#include <fcntl.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#define VIRTIO_NET_IRQ 14
#define VIRTIO_NET_QUEUE_SIZE 128
@@ -276,6 +279,8 @@ static struct pci_device_header virtio_net_pci_device = {
static void virtio_net__tap_init(void)
{
struct ifreq ifr;
int sock = socket(AF_INET, SOCK_STREAM, 0);
struct sockaddr_in sin = {0};
net_device.tap_fd = open("/dev/net/tun", O_RDWR);
if (net_device.tap_fd < 0)
@@ -291,9 +296,27 @@ static void virtio_net__tap_init(void)
ioctl(net_device.tap_fd, TUNSETNOCSUM, 1);
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, net_device.tap_name, sizeof(net_device.tap_name));
/*FIXME: Remove this after user can specify ip address and netmask*/
if (system("ifconfig tap0 192.168.33.2") < 0)
warning("Can not set ip address on tap0");
sin.sin_addr.s_addr = inet_addr("192.168.33.2");
memcpy(&(ifr.ifr_addr), &sin, sizeof(ifr.ifr_addr));
ifr.ifr_addr.sa_family = AF_INET;
if (ioctl(sock, SIOCSIFADDR, &ifr) < 0)
warning("Can not set ip address on tap device");
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, net_device.tap_name, sizeof(net_device.tap_name));
ioctl(sock, SIOCGIFFLAGS, &ifr);
ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
if (ioctl(sock, SIOCSIFFLAGS, &ifr) < 0)
warning("Could not bring tap device up");
close(sock);
}
static void virtio_net__io_thread_init(struct kvm *self)