+++ /dev/null
-/* veth driver port to Linux 2.6.18 */
-
-/*
- * drivers/net/veth.c
- *
- * Copyright (C) 2007, 2009 OpenVZ http://openvz.org, SWsoft Inc
- *
- * Author: Pavel Emelianov <xemul@openvz.org>
- * Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com>
- *
- */
-
-#include <linux/list.h>
-#include <linux/netdevice.h>
-#include <linux/ethtool.h>
-#include <linux/etherdevice.h>
-
-#include <net/dst.h>
-#include <net/xfrm.h>
-
-#define DRV_NAME "veth"
-#define DRV_VERSION "1.0"
-
-struct veth_net_stats {
- unsigned long rx_packets;
- unsigned long tx_packets;
- unsigned long rx_bytes;
- unsigned long tx_bytes;
- unsigned long tx_dropped;
-};
-
-struct veth_priv {
- struct net_device *peer;
- struct net_device *dev;
- struct list_head list;
- struct veth_net_stats *stats;
- unsigned ip_summed;
- struct net_device_stats dev_stats;
-};
-
-static LIST_HEAD(veth_list);
-
-/*
- * ethtool interface
- */
-
-static struct {
- const char string[ETH_GSTRING_LEN];
-} ethtool_stats_keys[] = {
- { "peer_ifindex" },
-};
-
-static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
-{
- cmd->supported = 0;
- cmd->advertising = 0;
- cmd->speed = SPEED_10000;
- cmd->duplex = DUPLEX_FULL;
- cmd->port = PORT_TP;
- cmd->phy_address = 0;
- cmd->transceiver = XCVR_INTERNAL;
- cmd->autoneg = AUTONEG_DISABLE;
- cmd->maxtxpkt = 0;
- cmd->maxrxpkt = 0;
- return 0;
-}
-
-static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
-{
- strcpy(info->driver, DRV_NAME);
- strcpy(info->version, DRV_VERSION);
- strcpy(info->fw_version, "N/A");
-}
-
-static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
-{
- switch(stringset) {
- case ETH_SS_STATS:
- memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys));
- break;
- }
-}
-
-static void veth_get_ethtool_stats(struct net_device *dev,
- struct ethtool_stats *stats, u64 *data)
-{
- struct veth_priv *priv;
-
- priv = netdev_priv(dev);
- data[0] = priv->peer->ifindex;
-}
-
-static u32 veth_get_rx_csum(struct net_device *dev)
-{
- struct veth_priv *priv;
-
- priv = netdev_priv(dev);
- return priv->ip_summed == CHECKSUM_UNNECESSARY;
-}
-
-static int veth_set_rx_csum(struct net_device *dev, u32 data)
-{
- struct veth_priv *priv;
-
- priv = netdev_priv(dev);
- priv->ip_summed = data ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE;
- return 0;
-}
-
-static u32 veth_get_tx_csum(struct net_device *dev)
-{
- return (dev->features & NETIF_F_NO_CSUM) != 0;
-}
-
-static int veth_set_tx_csum(struct net_device *dev, u32 data)
-{
- if (data)
- dev->features |= NETIF_F_NO_CSUM;
- else
- dev->features &= ~NETIF_F_NO_CSUM;
- return 0;
-}
-
-static struct ethtool_ops veth_ethtool_ops = {
- .get_settings = veth_get_settings,
- .get_drvinfo = veth_get_drvinfo,
- .get_link = ethtool_op_get_link,
- .get_rx_csum = veth_get_rx_csum,
- .set_rx_csum = veth_set_rx_csum,
- .get_tx_csum = veth_get_tx_csum,
- .set_tx_csum = veth_set_tx_csum,
- .get_sg = ethtool_op_get_sg,
- .set_sg = ethtool_op_set_sg,
- .get_strings = veth_get_strings,
- .get_ethtool_stats = veth_get_ethtool_stats,
-};
-
-/*
- * xmit
- */
-
-static int veth_xmit(struct sk_buff *skb, struct net_device *dev)
-{
- struct net_device *rcv = NULL;
- struct veth_priv *priv, *rcv_priv;
- struct veth_net_stats *stats;
- int length, cpu;
-
- skb_orphan(skb);
-
- priv = netdev_priv(dev);
- rcv = priv->peer;
- rcv_priv = netdev_priv(rcv);
-
- cpu = smp_processor_id();
- stats = per_cpu_ptr(priv->stats, cpu);
-
- if (!(rcv->flags & IFF_UP))
- goto outf;
-
- skb->dev = rcv;
- skb->pkt_type = PACKET_HOST;
- skb->protocol = eth_type_trans(skb, rcv);
- if (dev->features & NETIF_F_NO_CSUM)
- skb->ip_summed = rcv_priv->ip_summed;
-
- dst_release(skb->dst);
- skb->dst = NULL;
- secpath_reset(skb);
- nf_reset(skb);
-
- length = skb->len;
-
- stats->tx_bytes += length;
- stats->tx_packets++;
-
- stats = per_cpu_ptr(rcv_priv->stats, cpu);
- stats->rx_bytes += length;
- stats->rx_packets++;
-
- netif_rx(skb);
- return 0;
-
-outf:
- kfree_skb(skb);
- stats->tx_dropped++;
- return 0;
-}
-
-/*
- * general routines
- */
-
-static struct net_device_stats *veth_get_stats(struct net_device *dev)
-{
- struct veth_priv *priv;
- struct net_device_stats *dev_stats;
- int cpu;
- struct veth_net_stats *stats;
-
- priv = netdev_priv(dev);
- dev_stats = &priv->dev_stats;
-
- dev_stats->rx_packets = 0;
- dev_stats->tx_packets = 0;
- dev_stats->rx_bytes = 0;
- dev_stats->tx_bytes = 0;
- dev_stats->tx_dropped = 0;
-
- for_each_online_cpu(cpu) {
- stats = per_cpu_ptr(priv->stats, cpu);
-
- dev_stats->rx_packets += stats->rx_packets;
- dev_stats->tx_packets += stats->tx_packets;
- dev_stats->rx_bytes += stats->rx_bytes;
- dev_stats->tx_bytes += stats->tx_bytes;
- dev_stats->tx_dropped += stats->tx_dropped;
- }
-
- return dev_stats;
-}
-
-static int veth_open(struct net_device *dev)
-{
- struct veth_priv *priv;
-
- priv = netdev_priv(dev);
- if (priv->peer == NULL)
- return -ENOTCONN;
-
- if (priv->peer->flags & IFF_UP) {
- netif_carrier_on(dev);
- netif_carrier_on(priv->peer);
- }
- return 0;
-}
-
-static int veth_dev_init(struct net_device *dev)
-{
- struct veth_net_stats *stats;
- struct veth_priv *priv;
-
- stats = alloc_percpu(struct veth_net_stats);
- if (stats == NULL)
- return -ENOMEM;
-
- priv = netdev_priv(dev);
- priv->stats = stats;
- return 0;
-}
-
-static void veth_dev_free(struct net_device *dev)
-{
- struct veth_priv *priv;
-
- priv = netdev_priv(dev);
- free_percpu(priv->stats);
- free_netdev(dev);
-}
-
-static void veth_setup(struct net_device *dev)
-{
- ether_setup(dev);
-
- dev->hard_start_xmit = veth_xmit;
- dev->get_stats = veth_get_stats;
- dev->open = veth_open;
- dev->ethtool_ops = &veth_ethtool_ops;
- dev->features |= NETIF_F_LLTX;
- dev->init = veth_dev_init;
- dev->destructor = veth_dev_free;
-}
-
-static void veth_change_state(struct net_device *dev)
-{
- struct net_device *peer;
- struct veth_priv *priv;
-
- priv = netdev_priv(dev);
- peer = priv->peer;
-
- if (netif_carrier_ok(peer)) {
- if (!netif_carrier_ok(dev))
- netif_carrier_on(dev);
- } else {
- if (netif_carrier_ok(dev))
- netif_carrier_off(dev);
- }
-}
-
-static int veth_device_event(struct notifier_block *unused,
- unsigned long event, void *ptr)
-{
- struct net_device *dev = ptr;
-
- if (dev->open != veth_open)
- goto out;
-
- switch (event) {
- case NETDEV_CHANGE:
- veth_change_state(dev);
- break;
- }
-out:
- return NOTIFY_DONE;
-}
-
-static struct notifier_block veth_notifier_block __read_mostly = {
- .notifier_call = veth_device_event,
-};
-
-/*
- * netlink interface
- */
-
-static int veth_newlink(const char *devname, const char *peername)
-{
- int err;
- const char *names[2];
- struct net_device *devs[2];
- int i;
-
- names[0] = devname;
- names[1] = peername;
- devs[0] = devs[1] = NULL;
-
- for (i = 0; i < 2; i++) {
- struct net_device *dev;
-
- err = -ENOMEM;
- devs[i] = alloc_netdev(sizeof(struct veth_priv),
- names[i], veth_setup);
- if (!devs[i]) {
- goto err;
- }
-
- dev = devs[i];
-
- if (strchr(dev->name, '%')) {
- err = dev_alloc_name(dev, dev->name);
- if (err < 0)
- goto err;
- }
- random_ether_addr(dev->dev_addr);
-
- err = register_netdevice(dev);
- if (err < 0)
- goto err;
-
- netif_carrier_off(dev);
- }
-
- /*
- * tie the devices together
- */
-
- for (i = 0; i < 2; i++) {
- struct veth_priv *priv = netdev_priv(devs[i]);
- priv->dev = devs[i];
- priv->peer = devs[!i];
- if (!i)
- list_add(&priv->list, &veth_list);
- else
- INIT_LIST_HEAD(&priv->list);
- }
- return 0;
-
-err:
- for (i = 0; i < 2; i++) {
- if (devs[i]) {
- if (devs[i]->reg_state != NETREG_UNINITIALIZED)
- unregister_netdevice(devs[i]);
- else
- free_netdev(devs[i]);
- }
- }
- return err;
-}
-
-static void veth_dellink(struct net_device *dev)
-{
- struct veth_priv *priv;
- struct net_device *peer;
-
- priv = netdev_priv(dev);
- peer = priv->peer;
-
- if (!list_empty(&priv->list))
- list_del(&priv->list);
-
- priv = netdev_priv(peer);
- if (!list_empty(&priv->list))
- list_del(&priv->list);
-
- unregister_netdevice(dev);
- unregister_netdevice(peer);
-}
-
-/*
- * sysfs
- */
-
-/*
- * "show" function for the veth_pairs attribute.
- * The class parameter is ignored.
- */
-static ssize_t veth_show_veth_pairs(struct class *cls, char *buffer)
-{
- int res = 0;
- struct veth_priv *priv;
-
- list_for_each_entry(priv, &veth_list, list) {
- if (res > (PAGE_SIZE - (IFNAMSIZ * 2 + 1))) {
- /* not enough space for another interface name */
- if ((PAGE_SIZE - res) > 10)
- res = PAGE_SIZE - 10;
- res += sprintf(buffer + res, "++more++");
- break;
- }
- res += sprintf(buffer + res, "%s,%s ",
- priv->dev->name, priv->peer->name);
- }
- res += sprintf(buffer + res, "\n");
- res++;
- return res;
-}
-
-/*
- * "store" function for the veth_pairs attribute. This is what
- * creates and deletes veth pairs.
- *
- * The class parameter is ignored.
- *
- */
-static ssize_t veth_store_veth_pairs(struct class *cls, const char *buffer,
- size_t count)
-{
- int c = *buffer++;
- int retval;
- if (c == '+') {
- char devname[IFNAMSIZ + 1] = "";
- char peername[IFNAMSIZ + 1] = "";
- char *comma = strchr(buffer, ',');
- if (!comma)
- goto err_no_cmd;
- strncat(devname, buffer,
- min_t(int, sizeof devname, comma - buffer));
- strncat(peername, comma + 1,
- min_t(int, sizeof peername, strcspn(comma + 1, "\n")));
- if (!dev_valid_name(devname) || !dev_valid_name(peername))
- goto err_no_cmd;
- rtnl_lock();
- retval = veth_newlink(devname, peername);
- rtnl_unlock();
- return retval ? retval : count;
- } else if (c == '-') {
- char devname[IFNAMSIZ + 1] = "";
- struct net_device *dev;
-
- strncat(devname, buffer,
- min_t(int, sizeof devname, strcspn(buffer, "\n")));
- rtnl_lock();
- dev = __dev_get_by_name(devname);
- if (!dev)
- retval = -ENODEV;
- else if (dev->init != veth_dev_init)
- retval = -EINVAL;
- else {
- veth_dellink(dev);
- retval = count;
- }
- rtnl_unlock();
-
- return retval;
- }
-
-err_no_cmd:
- printk(KERN_ERR DRV_NAME ": no command found in veth_pairs. Use +ifname,peername or -ifname.\n");
- return -EPERM;
-}
-
-/* class attribute for veth_pairs file. This ends up in /sys/class/net */
-static CLASS_ATTR(veth_pairs, S_IWUSR | S_IRUGO,
- veth_show_veth_pairs, veth_store_veth_pairs);
-
-static struct class *netdev_class;
-
-/*
- * Initialize sysfs. This sets up the veth_pairs file in
- * /sys/class/net.
- */
-int veth_create_sysfs(void)
-{
- struct net_device *dev = dev_get_by_name("lo");
- if (!dev)
- return -ESRCH;
- netdev_class = dev->class_dev.class;
- if (!netdev_class)
- return -ENODEV;
-
- return class_create_file(netdev_class, &class_attr_veth_pairs);
-}
-
-/*
- * Remove /sys/class/net/veth_pairs.
- */
-void veth_destroy_sysfs(void)
-{
- class_remove_file(netdev_class, &class_attr_veth_pairs);
-}
-
-
-
-/*
- * init/fini
- */
-
-static __init int veth_init(void)
-{
- int retval = veth_create_sysfs();
- if (retval)
- return retval;
- register_netdevice_notifier(&veth_notifier_block);
- return 0;
-}
-
-static __exit void veth_exit(void)
-{
- struct veth_priv *p, *n;
-
- rtnl_lock();
-
- list_for_each_entry_safe(p, n, &veth_list, list)
- veth_dellink(p->dev);
-
- rtnl_unlock();
-
- unregister_netdevice_notifier(&veth_notifier_block);
- veth_destroy_sysfs();
-}
-
-module_init(veth_init);
-module_exit(veth_exit);
-
-MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
-MODULE_LICENSE("GPL v2");
int fd;
};
-struct patch_state {
- char *peer;
-};
-
struct netdev_dev_linux {
struct netdev_dev netdev_dev;
union {
struct tap_state tap;
- struct patch_state patch;
} state;
};
}
}
-static int
-if_up(const char *name)
-{
- struct ifreq ifr;
-
- strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
- ifr.ifr_flags = IFF_UP;
-
- if (ioctl(af_inet_sock, SIOCSIFFLAGS, &ifr) == -1) {
- VLOG_DBG_RL(&rl, "%s: failed to bring device up: %s",
- name, strerror(errno));
- return errno;
- }
-
- return 0;
-}
-
-/* A veth may be created using the 'command' "+<name>,<peer>". A veth may
- * be destroyed by using the 'command' "-<name>", where <name> can be
- * either side of the device.
- */
-static int
-modify_veth(const char *format, ...)
-{
- FILE *veth_file;
- va_list args;
- int retval;
-
- veth_file = fopen("/sys/class/net/veth_pairs", "w");
- if (!veth_file) {
- VLOG_WARN_RL(&rl, "could not open veth device. Are you running a "
- "supported XenServer with the kernel module loaded?");
- return ENODEV;
- }
- setvbuf(veth_file, NULL, _IONBF, 0);
-
- va_start(args, format);
- retval = vfprintf(veth_file, format, args);
- va_end(args);
-
- fclose(veth_file);
- if (retval < 0) {
- VLOG_WARN_RL(&rl, "could not destroy patch: %s", strerror(errno));
- return errno;
- }
-
- return 0;
-}
-
-static int
-create_patch(const char *name, const char *peer)
-{
- int retval;
- struct netdev_dev *peer_nd;
-
-
- /* Only create the veth if the peer didn't already do it. */
- peer_nd = netdev_dev_from_name(peer);
- if (peer_nd) {
- if (!strcmp("patch", netdev_dev_get_type(peer_nd))) {
- struct netdev_dev_linux *ndl = netdev_dev_linux_cast(peer_nd);
- if (!strcmp(name, ndl->state.patch.peer)) {
- return 0;
- } else {
- VLOG_WARN_RL(&rl, "peer '%s' already paired with '%s'",
- peer, ndl->state.patch.peer);
- return EINVAL;
- }
- } else {
- VLOG_WARN_RL(&rl, "peer '%s' exists and is not a patch", peer);
- return EINVAL;
- }
- }
-
- retval = modify_veth("+%s,%s", name, peer);
- if (retval) {
- return retval;
- }
-
- retval = if_up(name);
- if (retval) {
- return retval;
- }
-
- retval = if_up(peer);
- if (retval) {
- return retval;
- }
-
- return 0;
-}
-
-static int
-setup_patch(const char *name, const struct shash *args, char **peer_)
-{
- const char *peer;
-
- peer = shash_find_data(args, "peer");
- if (!peer) {
- VLOG_WARN("patch type requires valid 'peer' argument");
- return EINVAL;
- }
-
- if (shash_count(args) > 1) {
- VLOG_WARN("patch type takes only a 'peer' argument");
- return EINVAL;
- }
-
- if (strlen(peer) >= IFNAMSIZ) {
- VLOG_WARN_RL(&rl, "patch 'peer' arg too long");
- return EINVAL;
- }
-
- *peer_ = xstrdup(peer);
- return create_patch(name, peer);
-}
-
/* Creates the netdev device of 'type' with 'name'. */
static int
netdev_linux_create_system(const char *name, const char *type OVS_UNUSED,
return error;
}
-static int
-netdev_linux_create_patch(const char *name, const char *type OVS_UNUSED,
- const struct shash *args, struct netdev_dev **netdev_devp)
-{
- struct netdev_dev_linux *netdev_dev;
- char *peer = NULL;
- int error;
-
- error = setup_patch(name, args, &peer);
- if (error) {
- free(peer);
- return error;
- }
-
- netdev_dev = xzalloc(sizeof *netdev_dev);
- netdev_dev->state.patch.peer = peer;
- netdev_dev_init(&netdev_dev->netdev_dev, name, &netdev_patch_class);
- *netdev_devp = &netdev_dev->netdev_dev;
-
- return 0;
-}
-
static void
destroy_tap(struct netdev_dev_linux *netdev_dev)
{
}
}
-static void
-destroy_patch(struct netdev_dev_linux *netdev_dev)
-{
- const char *name = netdev_dev_get_name(&netdev_dev->netdev_dev);
- struct patch_state *state = &netdev_dev->state.patch;
-
- /* Only destroy veth if 'peer' doesn't exist as an existing netdev. */
- if (!netdev_dev_from_name(state->peer)) {
- modify_veth("-%s", name);
- }
- free(state->peer);
-}
-
/* Destroys the netdev device 'netdev_dev_'. */
static void
netdev_linux_destroy(struct netdev_dev *netdev_dev_)
}
} else if (!strcmp(type, "tap")) {
destroy_tap(netdev_dev);
- } else if (!strcmp(type, "patch")) {
- destroy_patch(netdev_dev);
}
free(netdev_dev);
netdev_linux_poll_remove,
};
-const struct netdev_class netdev_patch_class = {
- "patch",
-
- netdev_linux_init,
- netdev_linux_run,
- netdev_linux_wait,
-
- netdev_linux_create_patch,
- netdev_linux_destroy,
- NULL, /* reconfigure */
-
- netdev_linux_open,
- netdev_linux_close,
-
- NULL, /* enumerate */
-
- netdev_linux_recv,
- netdev_linux_recv_wait,
- netdev_linux_drain,
-
- netdev_linux_send,
- netdev_linux_send_wait,
-
- netdev_linux_set_etheraddr,
- netdev_linux_get_etheraddr,
- netdev_linux_get_mtu,
- netdev_linux_get_ifindex,
- netdev_linux_get_carrier,
- netdev_linux_get_stats,
- NULL, /* set_stats */
-
- netdev_linux_get_features,
- netdev_linux_set_advertisements,
- netdev_linux_get_vlan_vid,
- netdev_linux_set_policing,
-
- netdev_linux_get_in4,
- netdev_linux_set_in4,
- netdev_linux_get_in6,
- netdev_linux_add_router,
- netdev_linux_get_next_hop,
- netdev_linux_arp_lookup,
-
- netdev_linux_update_flags,
-
- netdev_linux_poll_add,
- netdev_linux_poll_remove,
-};
-
\f
static int
get_stats_via_netlink(int ifindex, struct netdev_stats *stats)
projects / openvswitch / commitdiff