static void setup_tun_net(char *arg)
{
struct device *dev;
struct net_info *net_info = malloc(sizeof(*net_info));
int ipfd;
u32 ip = INADDR_ANY;
bool bridging = false;
char tapif[IFNAMSIZ], *p;
struct virtio_net_config conf;
net_info->tunfd = get_tun_device(tapif);
dev = new_device("net", VIRTIO_ID_NET);
dev->priv = net_info;
add_virtqueue(dev, VIRTQUEUE_NUM, net_input);
add_virtqueue(dev, VIRTQUEUE_NUM, net_output);
ipfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
if (ipfd < 0)
err(1, "opening IP socket");
if (!strncmp(BRIDGE_PFX, arg, strlen(BRIDGE_PFX))) {
arg += strlen(BRIDGE_PFX);
bridging = true;
}
p = strchr(arg, ':');
if (p) {
str2mac(p+1, conf.mac);
add_feature(dev, VIRTIO_NET_F_MAC);
*p = '\0';
}
if (bridging)
add_to_bridge(ipfd, tapif, arg);
else
ip = str2ip(arg);
configure_device(ipfd, tapif, ip);
add_feature(dev, VIRTIO_NET_F_CSUM);
add_feature(dev, VIRTIO_NET_F_GUEST_CSUM);
add_feature(dev, VIRTIO_NET_F_GUEST_TSO4);
add_feature(dev, VIRTIO_NET_F_GUEST_TSO6);
add_feature(dev, VIRTIO_NET_F_GUEST_ECN);
add_feature(dev, VIRTIO_NET_F_HOST_TSO4);
add_feature(dev, VIRTIO_NET_F_HOST_TSO6);
add_feature(dev, VIRTIO_NET_F_HOST_ECN);
add_feature(dev, VIRTIO_RING_F_INDIRECT_DESC);
set_config(dev, sizeof(conf), &conf);
close(ipfd);
devices.device_num++;
if (bridging)
verbose("device %u: tun %s attached to bridge: %s\n",
devices.device_num, tapif, arg);
else
verbose("device %u: tun %s: %s\n",
devices.device_num, tapif, arg);
}
/*L:195
* Our network is a Host<->Guest network. This can either use bridging or
* routing, but the principle is the same: it uses the "tun" device to inject
* packets into the Host as if they came in from a normal network card. We
* just shunt packets between the Guest and the tun device.
*/
static void setup_tun_net(char *arg)
{
struct device *dev;
struct net_info *net_info = malloc(sizeof(*net_info));
int ipfd;
u32 ip = INADDR_ANY;
bool bridging = false;
char tapif[IFNAMSIZ], *p;
struct virtio_net_config conf;
net_info->tunfd = get_tun_device(tapif);
/* First we create a new network device. */
dev = new_device("net", VIRTIO_ID_NET);
dev->priv = net_info;
/* Network devices need a recv and a send queue, just like console. */
add_virtqueue(dev, VIRTQUEUE_NUM, net_input);
add_virtqueue(dev, VIRTQUEUE_NUM, net_output);
/*
* We need a socket to perform the magic network ioctls to bring up the
* tap interface, connect to the bridge etc. Any socket will do!
*/
ipfd = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
if (ipfd < 0)
err(1, "opening IP socket");
/* If the command line was --tunnet=bridge:<name> do bridging. */
if (!strncmp(BRIDGE_PFX, arg, strlen(BRIDGE_PFX))) {
arg += strlen(BRIDGE_PFX);
bridging = true;
}
/* A mac address may follow the bridge name or IP address */
p = strchr(arg, ':');
if (p) {
str2mac(p+1, conf.mac);
add_feature(dev, VIRTIO_NET_F_MAC);
*p = '\0';
}
/* arg is now either an IP address or a bridge name */
if (bridging)
add_to_bridge(ipfd, tapif, arg);
else
ip = str2ip(arg);
/* Set up the tun device. */
configure_device(ipfd, tapif, ip);
/* Expect Guest to handle everything except UFO */
add_feature(dev, VIRTIO_NET_F_CSUM);
add_feature(dev, VIRTIO_NET_F_GUEST_CSUM);
add_feature(dev, VIRTIO_NET_F_GUEST_TSO4);
add_feature(dev, VIRTIO_NET_F_GUEST_TSO6);
add_feature(dev, VIRTIO_NET_F_GUEST_ECN);
add_feature(dev, VIRTIO_NET_F_HOST_TSO4);
add_feature(dev, VIRTIO_NET_F_HOST_TSO6);
add_feature(dev, VIRTIO_NET_F_HOST_ECN);
/* We handle indirect ring entries */
add_feature(dev, VIRTIO_RING_F_INDIRECT_DESC);
set_config(dev, sizeof(conf), &conf);
/* We don't need the socket any more; setup is done. */
close(ipfd);
devices.device_num++;
if (bridging)
verbose("device %u: tun %s attached to bridge: %s\n",
devices.device_num, tapif, arg);
else
verbose("device %u: tun %s: %s\n",
devices.device_num, tapif, arg);
}
