mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Eric W. Biederman](/assets/img/avatar_default.png)
Replace the bh safe variant with the hard irq safe variant. We need a hard irq safe variant to deal with netpoll transmitting packets from hard irq context, and we need it in most if not all of the places using the bh safe variant. Except on 32bit uni-processor the code is exactly the same so don't bother with a bh variant, just have a hard irq safe variant that everyone can use. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
476 lines
10 KiB
C
476 lines
10 KiB
C
/*
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* drivers/net/veth.c
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*
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* Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc
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*
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* Author: Pavel Emelianov <xemul@openvz.org>
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* Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com>
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*
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*/
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#include <linux/netdevice.h>
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#include <linux/slab.h>
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#include <linux/ethtool.h>
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#include <linux/etherdevice.h>
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#include <linux/u64_stats_sync.h>
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#include <net/rtnetlink.h>
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#include <net/dst.h>
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#include <net/xfrm.h>
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#include <linux/veth.h>
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#include <linux/module.h>
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#define DRV_NAME "veth"
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#define DRV_VERSION "1.0"
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#define MIN_MTU 68 /* Min L3 MTU */
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#define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */
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struct pcpu_vstats {
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u64 packets;
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u64 bytes;
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struct u64_stats_sync syncp;
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};
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struct veth_priv {
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struct net_device __rcu *peer;
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atomic64_t dropped;
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};
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/*
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* ethtool interface
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*/
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static struct {
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const char string[ETH_GSTRING_LEN];
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} ethtool_stats_keys[] = {
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{ "peer_ifindex" },
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};
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static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
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{
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cmd->supported = 0;
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cmd->advertising = 0;
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ethtool_cmd_speed_set(cmd, SPEED_10000);
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cmd->duplex = DUPLEX_FULL;
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cmd->port = PORT_TP;
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cmd->phy_address = 0;
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cmd->transceiver = XCVR_INTERNAL;
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cmd->autoneg = AUTONEG_DISABLE;
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cmd->maxtxpkt = 0;
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cmd->maxrxpkt = 0;
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return 0;
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}
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static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
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{
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strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
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strlcpy(info->version, DRV_VERSION, sizeof(info->version));
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}
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static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
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{
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switch(stringset) {
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case ETH_SS_STATS:
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memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys));
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break;
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}
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}
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static int veth_get_sset_count(struct net_device *dev, int sset)
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{
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switch (sset) {
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case ETH_SS_STATS:
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return ARRAY_SIZE(ethtool_stats_keys);
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default:
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return -EOPNOTSUPP;
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}
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}
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static void veth_get_ethtool_stats(struct net_device *dev,
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struct ethtool_stats *stats, u64 *data)
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{
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struct veth_priv *priv = netdev_priv(dev);
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struct net_device *peer = rtnl_dereference(priv->peer);
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data[0] = peer ? peer->ifindex : 0;
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}
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static const struct ethtool_ops veth_ethtool_ops = {
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.get_settings = veth_get_settings,
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.get_drvinfo = veth_get_drvinfo,
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.get_link = ethtool_op_get_link,
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.get_strings = veth_get_strings,
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.get_sset_count = veth_get_sset_count,
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.get_ethtool_stats = veth_get_ethtool_stats,
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};
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static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct veth_priv *priv = netdev_priv(dev);
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struct net_device *rcv;
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int length = skb->len;
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rcu_read_lock();
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rcv = rcu_dereference(priv->peer);
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if (unlikely(!rcv)) {
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kfree_skb(skb);
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goto drop;
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}
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/* don't change ip_summed == CHECKSUM_PARTIAL, as that
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* will cause bad checksum on forwarded packets
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*/
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if (skb->ip_summed == CHECKSUM_NONE &&
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rcv->features & NETIF_F_RXCSUM)
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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if (likely(dev_forward_skb(rcv, skb) == NET_RX_SUCCESS)) {
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struct pcpu_vstats *stats = this_cpu_ptr(dev->vstats);
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u64_stats_update_begin(&stats->syncp);
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stats->bytes += length;
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stats->packets++;
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u64_stats_update_end(&stats->syncp);
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} else {
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drop:
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atomic64_inc(&priv->dropped);
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}
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rcu_read_unlock();
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return NETDEV_TX_OK;
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}
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/*
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* general routines
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*/
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static u64 veth_stats_one(struct pcpu_vstats *result, struct net_device *dev)
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{
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struct veth_priv *priv = netdev_priv(dev);
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int cpu;
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result->packets = 0;
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result->bytes = 0;
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for_each_possible_cpu(cpu) {
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struct pcpu_vstats *stats = per_cpu_ptr(dev->vstats, cpu);
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u64 packets, bytes;
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unsigned int start;
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do {
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start = u64_stats_fetch_begin_irq(&stats->syncp);
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packets = stats->packets;
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bytes = stats->bytes;
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} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
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result->packets += packets;
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result->bytes += bytes;
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}
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return atomic64_read(&priv->dropped);
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}
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static struct rtnl_link_stats64 *veth_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *tot)
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{
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struct veth_priv *priv = netdev_priv(dev);
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struct net_device *peer;
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struct pcpu_vstats one;
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tot->tx_dropped = veth_stats_one(&one, dev);
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tot->tx_bytes = one.bytes;
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tot->tx_packets = one.packets;
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rcu_read_lock();
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peer = rcu_dereference(priv->peer);
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if (peer) {
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tot->rx_dropped = veth_stats_one(&one, peer);
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tot->rx_bytes = one.bytes;
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tot->rx_packets = one.packets;
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}
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rcu_read_unlock();
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return tot;
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}
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/* fake multicast ability */
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static void veth_set_multicast_list(struct net_device *dev)
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{
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}
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static int veth_open(struct net_device *dev)
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{
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struct veth_priv *priv = netdev_priv(dev);
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struct net_device *peer = rtnl_dereference(priv->peer);
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if (!peer)
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return -ENOTCONN;
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if (peer->flags & IFF_UP) {
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netif_carrier_on(dev);
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netif_carrier_on(peer);
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}
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return 0;
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}
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static int veth_close(struct net_device *dev)
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{
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struct veth_priv *priv = netdev_priv(dev);
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struct net_device *peer = rtnl_dereference(priv->peer);
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netif_carrier_off(dev);
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if (peer)
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netif_carrier_off(peer);
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return 0;
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}
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static int is_valid_veth_mtu(int new_mtu)
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{
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return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
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}
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static int veth_change_mtu(struct net_device *dev, int new_mtu)
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{
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if (!is_valid_veth_mtu(new_mtu))
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return -EINVAL;
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dev->mtu = new_mtu;
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return 0;
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}
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static int veth_dev_init(struct net_device *dev)
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{
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dev->vstats = netdev_alloc_pcpu_stats(struct pcpu_vstats);
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if (!dev->vstats)
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return -ENOMEM;
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return 0;
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}
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static void veth_dev_free(struct net_device *dev)
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{
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free_percpu(dev->vstats);
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free_netdev(dev);
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}
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static const struct net_device_ops veth_netdev_ops = {
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.ndo_init = veth_dev_init,
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.ndo_open = veth_open,
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.ndo_stop = veth_close,
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.ndo_start_xmit = veth_xmit,
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.ndo_change_mtu = veth_change_mtu,
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.ndo_get_stats64 = veth_get_stats64,
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.ndo_set_rx_mode = veth_set_multicast_list,
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.ndo_set_mac_address = eth_mac_addr,
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};
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#define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
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NETIF_F_HW_CSUM | NETIF_F_RXCSUM | NETIF_F_HIGHDMA | \
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NETIF_F_GSO_GRE | NETIF_F_GSO_UDP_TUNNEL | \
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NETIF_F_GSO_IPIP | NETIF_F_GSO_SIT | NETIF_F_UFO | \
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NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | \
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NETIF_F_HW_VLAN_STAG_TX | NETIF_F_HW_VLAN_STAG_RX )
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static void veth_setup(struct net_device *dev)
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{
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ether_setup(dev);
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dev->priv_flags &= ~IFF_TX_SKB_SHARING;
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dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
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dev->netdev_ops = &veth_netdev_ops;
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dev->ethtool_ops = &veth_ethtool_ops;
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dev->features |= NETIF_F_LLTX;
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dev->features |= VETH_FEATURES;
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dev->vlan_features = dev->features &
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~(NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX);
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dev->destructor = veth_dev_free;
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dev->hw_features = VETH_FEATURES;
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dev->hw_enc_features = VETH_FEATURES;
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}
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/*
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* netlink interface
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*/
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static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
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{
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if (tb[IFLA_ADDRESS]) {
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if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
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return -EINVAL;
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if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
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return -EADDRNOTAVAIL;
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}
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if (tb[IFLA_MTU]) {
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if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
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return -EINVAL;
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}
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return 0;
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}
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static struct rtnl_link_ops veth_link_ops;
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static int veth_newlink(struct net *src_net, struct net_device *dev,
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struct nlattr *tb[], struct nlattr *data[])
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{
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int err;
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struct net_device *peer;
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struct veth_priv *priv;
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char ifname[IFNAMSIZ];
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struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
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struct ifinfomsg *ifmp;
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struct net *net;
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/*
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* create and register peer first
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*/
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if (data != NULL && data[VETH_INFO_PEER] != NULL) {
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struct nlattr *nla_peer;
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nla_peer = data[VETH_INFO_PEER];
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ifmp = nla_data(nla_peer);
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err = rtnl_nla_parse_ifla(peer_tb,
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nla_data(nla_peer) + sizeof(struct ifinfomsg),
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nla_len(nla_peer) - sizeof(struct ifinfomsg));
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if (err < 0)
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return err;
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err = veth_validate(peer_tb, NULL);
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if (err < 0)
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return err;
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tbp = peer_tb;
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} else {
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ifmp = NULL;
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tbp = tb;
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}
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if (tbp[IFLA_IFNAME])
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nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
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else
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snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
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net = rtnl_link_get_net(src_net, tbp);
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if (IS_ERR(net))
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return PTR_ERR(net);
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peer = rtnl_create_link(net, ifname, &veth_link_ops, tbp);
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if (IS_ERR(peer)) {
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put_net(net);
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return PTR_ERR(peer);
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}
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if (tbp[IFLA_ADDRESS] == NULL)
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eth_hw_addr_random(peer);
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if (ifmp && (dev->ifindex != 0))
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peer->ifindex = ifmp->ifi_index;
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err = register_netdevice(peer);
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put_net(net);
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net = NULL;
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if (err < 0)
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goto err_register_peer;
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netif_carrier_off(peer);
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err = rtnl_configure_link(peer, ifmp);
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if (err < 0)
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goto err_configure_peer;
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/*
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* register dev last
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*
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* note, that since we've registered new device the dev's name
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* should be re-allocated
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*/
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if (tb[IFLA_ADDRESS] == NULL)
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eth_hw_addr_random(dev);
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if (tb[IFLA_IFNAME])
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nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
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else
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snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
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err = register_netdevice(dev);
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if (err < 0)
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goto err_register_dev;
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netif_carrier_off(dev);
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/*
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* tie the deviced together
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*/
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priv = netdev_priv(dev);
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rcu_assign_pointer(priv->peer, peer);
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priv = netdev_priv(peer);
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rcu_assign_pointer(priv->peer, dev);
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return 0;
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err_register_dev:
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/* nothing to do */
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err_configure_peer:
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unregister_netdevice(peer);
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return err;
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err_register_peer:
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free_netdev(peer);
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return err;
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}
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static void veth_dellink(struct net_device *dev, struct list_head *head)
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{
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struct veth_priv *priv;
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struct net_device *peer;
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priv = netdev_priv(dev);
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peer = rtnl_dereference(priv->peer);
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/* Note : dellink() is called from default_device_exit_batch(),
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* before a rcu_synchronize() point. The devices are guaranteed
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* not being freed before one RCU grace period.
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*/
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RCU_INIT_POINTER(priv->peer, NULL);
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unregister_netdevice_queue(dev, head);
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if (peer) {
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priv = netdev_priv(peer);
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RCU_INIT_POINTER(priv->peer, NULL);
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unregister_netdevice_queue(peer, head);
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}
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}
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static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = {
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[VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) },
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};
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static struct rtnl_link_ops veth_link_ops = {
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.kind = DRV_NAME,
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.priv_size = sizeof(struct veth_priv),
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.setup = veth_setup,
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.validate = veth_validate,
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.newlink = veth_newlink,
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.dellink = veth_dellink,
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.policy = veth_policy,
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.maxtype = VETH_INFO_MAX,
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};
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/*
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* init/fini
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*/
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static __init int veth_init(void)
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{
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return rtnl_link_register(&veth_link_ops);
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}
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static __exit void veth_exit(void)
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{
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rtnl_link_unregister(&veth_link_ops);
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}
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module_init(veth_init);
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module_exit(veth_exit);
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MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS_RTNL_LINK(DRV_NAME);
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