1e314dbdcSPavel Emelyanov /* 2e314dbdcSPavel Emelyanov * drivers/net/veth.c 3e314dbdcSPavel Emelyanov * 4e314dbdcSPavel Emelyanov * Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc 5e314dbdcSPavel Emelyanov * 6e314dbdcSPavel Emelyanov * Author: Pavel Emelianov <xemul@openvz.org> 7e314dbdcSPavel Emelyanov * Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com> 8e314dbdcSPavel Emelyanov * 9e314dbdcSPavel Emelyanov */ 10e314dbdcSPavel Emelyanov 11e314dbdcSPavel Emelyanov #include <linux/netdevice.h> 125a0e3ad6STejun Heo #include <linux/slab.h> 13e314dbdcSPavel Emelyanov #include <linux/ethtool.h> 14e314dbdcSPavel Emelyanov #include <linux/etherdevice.h> 15e314dbdcSPavel Emelyanov 16e314dbdcSPavel Emelyanov #include <net/dst.h> 17e314dbdcSPavel Emelyanov #include <net/xfrm.h> 18ecef969eSStephen Hemminger #include <linux/veth.h> 19e314dbdcSPavel Emelyanov 20e314dbdcSPavel Emelyanov #define DRV_NAME "veth" 21e314dbdcSPavel Emelyanov #define DRV_VERSION "1.0" 22e314dbdcSPavel Emelyanov 2338d40815SEric Biederman #define MIN_MTU 68 /* Min L3 MTU */ 2438d40815SEric Biederman #define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */ 2538d40815SEric Biederman #define MTU_PAD (ETH_HLEN + 4) /* Max difference between L2 and L3 size MTU */ 2638d40815SEric Biederman 27e314dbdcSPavel Emelyanov struct veth_net_stats { 28e314dbdcSPavel Emelyanov unsigned long rx_packets; 29e314dbdcSPavel Emelyanov unsigned long tx_packets; 30e314dbdcSPavel Emelyanov unsigned long rx_bytes; 31e314dbdcSPavel Emelyanov unsigned long tx_bytes; 32e314dbdcSPavel Emelyanov unsigned long tx_dropped; 3338d40815SEric Biederman unsigned long rx_dropped; 34e314dbdcSPavel Emelyanov }; 35e314dbdcSPavel Emelyanov 36e314dbdcSPavel Emelyanov struct veth_priv { 37e314dbdcSPavel Emelyanov struct net_device *peer; 3847d74275STejun Heo struct veth_net_stats __percpu *stats; 39e314dbdcSPavel Emelyanov unsigned ip_summed; 40e314dbdcSPavel Emelyanov }; 41e314dbdcSPavel Emelyanov 42e314dbdcSPavel Emelyanov /* 43e314dbdcSPavel Emelyanov * ethtool interface 44e314dbdcSPavel Emelyanov */ 45e314dbdcSPavel Emelyanov 46e314dbdcSPavel Emelyanov static struct { 47e314dbdcSPavel Emelyanov const char string[ETH_GSTRING_LEN]; 48e314dbdcSPavel Emelyanov } ethtool_stats_keys[] = { 49e314dbdcSPavel Emelyanov { "peer_ifindex" }, 50e314dbdcSPavel Emelyanov }; 51e314dbdcSPavel Emelyanov 52e314dbdcSPavel Emelyanov static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 53e314dbdcSPavel Emelyanov { 54e314dbdcSPavel Emelyanov cmd->supported = 0; 55e314dbdcSPavel Emelyanov cmd->advertising = 0; 56e314dbdcSPavel Emelyanov cmd->speed = SPEED_10000; 57e314dbdcSPavel Emelyanov cmd->duplex = DUPLEX_FULL; 58e314dbdcSPavel Emelyanov cmd->port = PORT_TP; 59e314dbdcSPavel Emelyanov cmd->phy_address = 0; 60e314dbdcSPavel Emelyanov cmd->transceiver = XCVR_INTERNAL; 61e314dbdcSPavel Emelyanov cmd->autoneg = AUTONEG_DISABLE; 62e314dbdcSPavel Emelyanov cmd->maxtxpkt = 0; 63e314dbdcSPavel Emelyanov cmd->maxrxpkt = 0; 64e314dbdcSPavel Emelyanov return 0; 65e314dbdcSPavel Emelyanov } 66e314dbdcSPavel Emelyanov 67e314dbdcSPavel Emelyanov static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) 68e314dbdcSPavel Emelyanov { 69e314dbdcSPavel Emelyanov strcpy(info->driver, DRV_NAME); 70e314dbdcSPavel Emelyanov strcpy(info->version, DRV_VERSION); 71e314dbdcSPavel Emelyanov strcpy(info->fw_version, "N/A"); 72e314dbdcSPavel Emelyanov } 73e314dbdcSPavel Emelyanov 74e314dbdcSPavel Emelyanov static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf) 75e314dbdcSPavel Emelyanov { 76e314dbdcSPavel Emelyanov switch(stringset) { 77e314dbdcSPavel Emelyanov case ETH_SS_STATS: 78e314dbdcSPavel Emelyanov memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys)); 79e314dbdcSPavel Emelyanov break; 80e314dbdcSPavel Emelyanov } 81e314dbdcSPavel Emelyanov } 82e314dbdcSPavel Emelyanov 83b9f2c044SJeff Garzik static int veth_get_sset_count(struct net_device *dev, int sset) 84e314dbdcSPavel Emelyanov { 85b9f2c044SJeff Garzik switch (sset) { 86b9f2c044SJeff Garzik case ETH_SS_STATS: 87e314dbdcSPavel Emelyanov return ARRAY_SIZE(ethtool_stats_keys); 88b9f2c044SJeff Garzik default: 89b9f2c044SJeff Garzik return -EOPNOTSUPP; 90b9f2c044SJeff Garzik } 91e314dbdcSPavel Emelyanov } 92e314dbdcSPavel Emelyanov 93e314dbdcSPavel Emelyanov static void veth_get_ethtool_stats(struct net_device *dev, 94e314dbdcSPavel Emelyanov struct ethtool_stats *stats, u64 *data) 95e314dbdcSPavel Emelyanov { 96e314dbdcSPavel Emelyanov struct veth_priv *priv; 97e314dbdcSPavel Emelyanov 98e314dbdcSPavel Emelyanov priv = netdev_priv(dev); 99e314dbdcSPavel Emelyanov data[0] = priv->peer->ifindex; 100e314dbdcSPavel Emelyanov } 101e314dbdcSPavel Emelyanov 102e314dbdcSPavel Emelyanov static u32 veth_get_rx_csum(struct net_device *dev) 103e314dbdcSPavel Emelyanov { 104e314dbdcSPavel Emelyanov struct veth_priv *priv; 105e314dbdcSPavel Emelyanov 106e314dbdcSPavel Emelyanov priv = netdev_priv(dev); 107e314dbdcSPavel Emelyanov return priv->ip_summed == CHECKSUM_UNNECESSARY; 108e314dbdcSPavel Emelyanov } 109e314dbdcSPavel Emelyanov 110e314dbdcSPavel Emelyanov static int veth_set_rx_csum(struct net_device *dev, u32 data) 111e314dbdcSPavel Emelyanov { 112e314dbdcSPavel Emelyanov struct veth_priv *priv; 113e314dbdcSPavel Emelyanov 114e314dbdcSPavel Emelyanov priv = netdev_priv(dev); 115e314dbdcSPavel Emelyanov priv->ip_summed = data ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE; 116e314dbdcSPavel Emelyanov return 0; 117e314dbdcSPavel Emelyanov } 118e314dbdcSPavel Emelyanov 119e314dbdcSPavel Emelyanov static u32 veth_get_tx_csum(struct net_device *dev) 120e314dbdcSPavel Emelyanov { 121e314dbdcSPavel Emelyanov return (dev->features & NETIF_F_NO_CSUM) != 0; 122e314dbdcSPavel Emelyanov } 123e314dbdcSPavel Emelyanov 124e314dbdcSPavel Emelyanov static int veth_set_tx_csum(struct net_device *dev, u32 data) 125e314dbdcSPavel Emelyanov { 126e314dbdcSPavel Emelyanov if (data) 127e314dbdcSPavel Emelyanov dev->features |= NETIF_F_NO_CSUM; 128e314dbdcSPavel Emelyanov else 129e314dbdcSPavel Emelyanov dev->features &= ~NETIF_F_NO_CSUM; 130e314dbdcSPavel Emelyanov return 0; 131e314dbdcSPavel Emelyanov } 132e314dbdcSPavel Emelyanov 1330fc0b732SStephen Hemminger static const struct ethtool_ops veth_ethtool_ops = { 134e314dbdcSPavel Emelyanov .get_settings = veth_get_settings, 135e314dbdcSPavel Emelyanov .get_drvinfo = veth_get_drvinfo, 136e314dbdcSPavel Emelyanov .get_link = ethtool_op_get_link, 137e314dbdcSPavel Emelyanov .get_rx_csum = veth_get_rx_csum, 138e314dbdcSPavel Emelyanov .set_rx_csum = veth_set_rx_csum, 139e314dbdcSPavel Emelyanov .get_tx_csum = veth_get_tx_csum, 140e314dbdcSPavel Emelyanov .set_tx_csum = veth_set_tx_csum, 141e314dbdcSPavel Emelyanov .get_sg = ethtool_op_get_sg, 142e314dbdcSPavel Emelyanov .set_sg = ethtool_op_set_sg, 143e314dbdcSPavel Emelyanov .get_strings = veth_get_strings, 144b9f2c044SJeff Garzik .get_sset_count = veth_get_sset_count, 145e314dbdcSPavel Emelyanov .get_ethtool_stats = veth_get_ethtool_stats, 146e314dbdcSPavel Emelyanov }; 147e314dbdcSPavel Emelyanov 148e314dbdcSPavel Emelyanov /* 149e314dbdcSPavel Emelyanov * xmit 150e314dbdcSPavel Emelyanov */ 151e314dbdcSPavel Emelyanov 152424efe9cSStephen Hemminger static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev) 153e314dbdcSPavel Emelyanov { 154e314dbdcSPavel Emelyanov struct net_device *rcv = NULL; 155e314dbdcSPavel Emelyanov struct veth_priv *priv, *rcv_priv; 15638d40815SEric Biederman struct veth_net_stats *stats, *rcv_stats; 157e7dcaa47SChristoph Lameter int length; 158e314dbdcSPavel Emelyanov 159e314dbdcSPavel Emelyanov priv = netdev_priv(dev); 160e314dbdcSPavel Emelyanov rcv = priv->peer; 161e314dbdcSPavel Emelyanov rcv_priv = netdev_priv(rcv); 162e314dbdcSPavel Emelyanov 163e7dcaa47SChristoph Lameter stats = this_cpu_ptr(priv->stats); 164e7dcaa47SChristoph Lameter rcv_stats = this_cpu_ptr(rcv_priv->stats); 165e314dbdcSPavel Emelyanov 166e314dbdcSPavel Emelyanov if (!(rcv->flags & IFF_UP)) 16738d40815SEric Biederman goto tx_drop; 16838d40815SEric Biederman 1690b796750SMichał Mirosław /* don't change ip_summed == CHECKSUM_PARTIAL, as that 1700b796750SMichał Mirosław will cause bad checksum on forwarded packets */ 1710b796750SMichał Mirosław if (skb->ip_summed == CHECKSUM_NONE) 172e314dbdcSPavel Emelyanov skb->ip_summed = rcv_priv->ip_summed; 173e314dbdcSPavel Emelyanov 17444540960SArnd Bergmann length = skb->len + ETH_HLEN; 17544540960SArnd Bergmann if (dev_forward_skb(rcv, skb) != NET_RX_SUCCESS) 17644540960SArnd Bergmann goto rx_drop; 177e314dbdcSPavel Emelyanov 178e314dbdcSPavel Emelyanov stats->tx_bytes += length; 179e314dbdcSPavel Emelyanov stats->tx_packets++; 180e314dbdcSPavel Emelyanov 18138d40815SEric Biederman rcv_stats->rx_bytes += length; 18238d40815SEric Biederman rcv_stats->rx_packets++; 183e314dbdcSPavel Emelyanov 1846ed10654SPatrick McHardy return NETDEV_TX_OK; 185e314dbdcSPavel Emelyanov 18638d40815SEric Biederman tx_drop: 187e314dbdcSPavel Emelyanov kfree_skb(skb); 188e314dbdcSPavel Emelyanov stats->tx_dropped++; 1896ed10654SPatrick McHardy return NETDEV_TX_OK; 19038d40815SEric Biederman 19138d40815SEric Biederman rx_drop: 19238d40815SEric Biederman rcv_stats->rx_dropped++; 1936ed10654SPatrick McHardy return NETDEV_TX_OK; 194e314dbdcSPavel Emelyanov } 195e314dbdcSPavel Emelyanov 196e314dbdcSPavel Emelyanov /* 197e314dbdcSPavel Emelyanov * general routines 198e314dbdcSPavel Emelyanov */ 199e314dbdcSPavel Emelyanov 200e314dbdcSPavel Emelyanov static struct net_device_stats *veth_get_stats(struct net_device *dev) 201e314dbdcSPavel Emelyanov { 20211687a10SDavid S. Miller struct veth_priv *priv; 20311687a10SDavid S. Miller int cpu; 2042b1c8b0fSEric Dumazet struct veth_net_stats *stats, total = {0}; 205e314dbdcSPavel Emelyanov 20611687a10SDavid S. Miller priv = netdev_priv(dev); 20711687a10SDavid S. Miller 2082b1c8b0fSEric Dumazet for_each_possible_cpu(cpu) { 209e314dbdcSPavel Emelyanov stats = per_cpu_ptr(priv->stats, cpu); 210e314dbdcSPavel Emelyanov 2112b1c8b0fSEric Dumazet total.rx_packets += stats->rx_packets; 2122b1c8b0fSEric Dumazet total.tx_packets += stats->tx_packets; 2132b1c8b0fSEric Dumazet total.rx_bytes += stats->rx_bytes; 2142b1c8b0fSEric Dumazet total.tx_bytes += stats->tx_bytes; 2152b1c8b0fSEric Dumazet total.tx_dropped += stats->tx_dropped; 2162b1c8b0fSEric Dumazet total.rx_dropped += stats->rx_dropped; 217e314dbdcSPavel Emelyanov } 2182b1c8b0fSEric Dumazet dev->stats.rx_packets = total.rx_packets; 2192b1c8b0fSEric Dumazet dev->stats.tx_packets = total.tx_packets; 2202b1c8b0fSEric Dumazet dev->stats.rx_bytes = total.rx_bytes; 2212b1c8b0fSEric Dumazet dev->stats.tx_bytes = total.tx_bytes; 2222b1c8b0fSEric Dumazet dev->stats.tx_dropped = total.tx_dropped; 2232b1c8b0fSEric Dumazet dev->stats.rx_dropped = total.rx_dropped; 224e314dbdcSPavel Emelyanov 2252b1c8b0fSEric Dumazet return &dev->stats; 226e314dbdcSPavel Emelyanov } 227e314dbdcSPavel Emelyanov 228e314dbdcSPavel Emelyanov static int veth_open(struct net_device *dev) 229e314dbdcSPavel Emelyanov { 230e314dbdcSPavel Emelyanov struct veth_priv *priv; 231e314dbdcSPavel Emelyanov 232e314dbdcSPavel Emelyanov priv = netdev_priv(dev); 233e314dbdcSPavel Emelyanov if (priv->peer == NULL) 234e314dbdcSPavel Emelyanov return -ENOTCONN; 235e314dbdcSPavel Emelyanov 236e314dbdcSPavel Emelyanov if (priv->peer->flags & IFF_UP) { 237e314dbdcSPavel Emelyanov netif_carrier_on(dev); 238e314dbdcSPavel Emelyanov netif_carrier_on(priv->peer); 239e314dbdcSPavel Emelyanov } 240e314dbdcSPavel Emelyanov return 0; 241e314dbdcSPavel Emelyanov } 242e314dbdcSPavel Emelyanov 2432cf48a10SEric W. Biederman static int veth_close(struct net_device *dev) 2442cf48a10SEric W. Biederman { 2452cf48a10SEric W. Biederman struct veth_priv *priv = netdev_priv(dev); 2462cf48a10SEric W. Biederman 2472cf48a10SEric W. Biederman netif_carrier_off(dev); 2482cf48a10SEric W. Biederman netif_carrier_off(priv->peer); 2492cf48a10SEric W. Biederman 2502cf48a10SEric W. Biederman return 0; 2512cf48a10SEric W. Biederman } 2522cf48a10SEric W. Biederman 25338d40815SEric Biederman static int is_valid_veth_mtu(int new_mtu) 25438d40815SEric Biederman { 255807540baSEric Dumazet return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU; 25638d40815SEric Biederman } 25738d40815SEric Biederman 25838d40815SEric Biederman static int veth_change_mtu(struct net_device *dev, int new_mtu) 25938d40815SEric Biederman { 26038d40815SEric Biederman if (!is_valid_veth_mtu(new_mtu)) 26138d40815SEric Biederman return -EINVAL; 26238d40815SEric Biederman dev->mtu = new_mtu; 26338d40815SEric Biederman return 0; 26438d40815SEric Biederman } 26538d40815SEric Biederman 266e314dbdcSPavel Emelyanov static int veth_dev_init(struct net_device *dev) 267e314dbdcSPavel Emelyanov { 26847d74275STejun Heo struct veth_net_stats __percpu *stats; 269e314dbdcSPavel Emelyanov struct veth_priv *priv; 270e314dbdcSPavel Emelyanov 271e314dbdcSPavel Emelyanov stats = alloc_percpu(struct veth_net_stats); 272e314dbdcSPavel Emelyanov if (stats == NULL) 273e314dbdcSPavel Emelyanov return -ENOMEM; 274e314dbdcSPavel Emelyanov 275e314dbdcSPavel Emelyanov priv = netdev_priv(dev); 276e314dbdcSPavel Emelyanov priv->stats = stats; 277e314dbdcSPavel Emelyanov return 0; 278e314dbdcSPavel Emelyanov } 279e314dbdcSPavel Emelyanov 28011687a10SDavid S. Miller static void veth_dev_free(struct net_device *dev) 28111687a10SDavid S. Miller { 28211687a10SDavid S. Miller struct veth_priv *priv; 28311687a10SDavid S. Miller 28411687a10SDavid S. Miller priv = netdev_priv(dev); 28511687a10SDavid S. Miller free_percpu(priv->stats); 28611687a10SDavid S. Miller free_netdev(dev); 28711687a10SDavid S. Miller } 28811687a10SDavid S. Miller 2894456e7bdSStephen Hemminger static const struct net_device_ops veth_netdev_ops = { 2904456e7bdSStephen Hemminger .ndo_init = veth_dev_init, 2914456e7bdSStephen Hemminger .ndo_open = veth_open, 2922cf48a10SEric W. Biederman .ndo_stop = veth_close, 29300829823SStephen Hemminger .ndo_start_xmit = veth_xmit, 29438d40815SEric Biederman .ndo_change_mtu = veth_change_mtu, 2954456e7bdSStephen Hemminger .ndo_get_stats = veth_get_stats, 296ee923623SDaniel Lezcano .ndo_set_mac_address = eth_mac_addr, 2974456e7bdSStephen Hemminger }; 2984456e7bdSStephen Hemminger 299e314dbdcSPavel Emelyanov static void veth_setup(struct net_device *dev) 300e314dbdcSPavel Emelyanov { 301e314dbdcSPavel Emelyanov ether_setup(dev); 302e314dbdcSPavel Emelyanov 3034456e7bdSStephen Hemminger dev->netdev_ops = &veth_netdev_ops; 304e314dbdcSPavel Emelyanov dev->ethtool_ops = &veth_ethtool_ops; 305e314dbdcSPavel Emelyanov dev->features |= NETIF_F_LLTX; 30611687a10SDavid S. Miller dev->destructor = veth_dev_free; 307e314dbdcSPavel Emelyanov } 308e314dbdcSPavel Emelyanov 309e314dbdcSPavel Emelyanov /* 310e314dbdcSPavel Emelyanov * netlink interface 311e314dbdcSPavel Emelyanov */ 312e314dbdcSPavel Emelyanov 313e314dbdcSPavel Emelyanov static int veth_validate(struct nlattr *tb[], struct nlattr *data[]) 314e314dbdcSPavel Emelyanov { 315e314dbdcSPavel Emelyanov if (tb[IFLA_ADDRESS]) { 316e314dbdcSPavel Emelyanov if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 317e314dbdcSPavel Emelyanov return -EINVAL; 318e314dbdcSPavel Emelyanov if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 319e314dbdcSPavel Emelyanov return -EADDRNOTAVAIL; 320e314dbdcSPavel Emelyanov } 32138d40815SEric Biederman if (tb[IFLA_MTU]) { 32238d40815SEric Biederman if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU]))) 32338d40815SEric Biederman return -EINVAL; 32438d40815SEric Biederman } 325e314dbdcSPavel Emelyanov return 0; 326e314dbdcSPavel Emelyanov } 327e314dbdcSPavel Emelyanov 328e314dbdcSPavel Emelyanov static struct rtnl_link_ops veth_link_ops; 329e314dbdcSPavel Emelyanov 33081adee47SEric W. Biederman static int veth_newlink(struct net *src_net, struct net_device *dev, 331e314dbdcSPavel Emelyanov struct nlattr *tb[], struct nlattr *data[]) 332e314dbdcSPavel Emelyanov { 333e314dbdcSPavel Emelyanov int err; 334e314dbdcSPavel Emelyanov struct net_device *peer; 335e314dbdcSPavel Emelyanov struct veth_priv *priv; 336e314dbdcSPavel Emelyanov char ifname[IFNAMSIZ]; 337e314dbdcSPavel Emelyanov struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; 3383729d502SPatrick McHardy struct ifinfomsg *ifmp; 33981adee47SEric W. Biederman struct net *net; 340e314dbdcSPavel Emelyanov 341e314dbdcSPavel Emelyanov /* 342e314dbdcSPavel Emelyanov * create and register peer first 343e314dbdcSPavel Emelyanov */ 344e314dbdcSPavel Emelyanov if (data != NULL && data[VETH_INFO_PEER] != NULL) { 345e314dbdcSPavel Emelyanov struct nlattr *nla_peer; 346e314dbdcSPavel Emelyanov 347e314dbdcSPavel Emelyanov nla_peer = data[VETH_INFO_PEER]; 3483729d502SPatrick McHardy ifmp = nla_data(nla_peer); 349e314dbdcSPavel Emelyanov err = nla_parse(peer_tb, IFLA_MAX, 350e314dbdcSPavel Emelyanov nla_data(nla_peer) + sizeof(struct ifinfomsg), 351e314dbdcSPavel Emelyanov nla_len(nla_peer) - sizeof(struct ifinfomsg), 352e314dbdcSPavel Emelyanov ifla_policy); 353e314dbdcSPavel Emelyanov if (err < 0) 354e314dbdcSPavel Emelyanov return err; 355e314dbdcSPavel Emelyanov 356e314dbdcSPavel Emelyanov err = veth_validate(peer_tb, NULL); 357e314dbdcSPavel Emelyanov if (err < 0) 358e314dbdcSPavel Emelyanov return err; 359e314dbdcSPavel Emelyanov 360e314dbdcSPavel Emelyanov tbp = peer_tb; 3613729d502SPatrick McHardy } else { 3623729d502SPatrick McHardy ifmp = NULL; 363e314dbdcSPavel Emelyanov tbp = tb; 3643729d502SPatrick McHardy } 365e314dbdcSPavel Emelyanov 366e314dbdcSPavel Emelyanov if (tbp[IFLA_IFNAME]) 367e314dbdcSPavel Emelyanov nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); 368e314dbdcSPavel Emelyanov else 369e314dbdcSPavel Emelyanov snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); 370e314dbdcSPavel Emelyanov 37181adee47SEric W. Biederman net = rtnl_link_get_net(src_net, tbp); 37281adee47SEric W. Biederman if (IS_ERR(net)) 37381adee47SEric W. Biederman return PTR_ERR(net); 37481adee47SEric W. Biederman 37581adee47SEric W. Biederman peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp); 37681adee47SEric W. Biederman if (IS_ERR(peer)) { 37781adee47SEric W. Biederman put_net(net); 378e314dbdcSPavel Emelyanov return PTR_ERR(peer); 37981adee47SEric W. Biederman } 380e314dbdcSPavel Emelyanov 381e314dbdcSPavel Emelyanov if (tbp[IFLA_ADDRESS] == NULL) 382e314dbdcSPavel Emelyanov random_ether_addr(peer->dev_addr); 383e314dbdcSPavel Emelyanov 384e314dbdcSPavel Emelyanov err = register_netdevice(peer); 38581adee47SEric W. Biederman put_net(net); 38681adee47SEric W. Biederman net = NULL; 387e314dbdcSPavel Emelyanov if (err < 0) 388e314dbdcSPavel Emelyanov goto err_register_peer; 389e314dbdcSPavel Emelyanov 390e314dbdcSPavel Emelyanov netif_carrier_off(peer); 391e314dbdcSPavel Emelyanov 3923729d502SPatrick McHardy err = rtnl_configure_link(peer, ifmp); 3933729d502SPatrick McHardy if (err < 0) 3943729d502SPatrick McHardy goto err_configure_peer; 3953729d502SPatrick McHardy 396e314dbdcSPavel Emelyanov /* 397e314dbdcSPavel Emelyanov * register dev last 398e314dbdcSPavel Emelyanov * 399e314dbdcSPavel Emelyanov * note, that since we've registered new device the dev's name 400e314dbdcSPavel Emelyanov * should be re-allocated 401e314dbdcSPavel Emelyanov */ 402e314dbdcSPavel Emelyanov 403e314dbdcSPavel Emelyanov if (tb[IFLA_ADDRESS] == NULL) 404e314dbdcSPavel Emelyanov random_ether_addr(dev->dev_addr); 405e314dbdcSPavel Emelyanov 406e314dbdcSPavel Emelyanov if (tb[IFLA_IFNAME]) 407e314dbdcSPavel Emelyanov nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); 408e314dbdcSPavel Emelyanov else 409e314dbdcSPavel Emelyanov snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); 410e314dbdcSPavel Emelyanov 411e314dbdcSPavel Emelyanov if (strchr(dev->name, '%')) { 412e314dbdcSPavel Emelyanov err = dev_alloc_name(dev, dev->name); 413e314dbdcSPavel Emelyanov if (err < 0) 414e314dbdcSPavel Emelyanov goto err_alloc_name; 415e314dbdcSPavel Emelyanov } 416e314dbdcSPavel Emelyanov 417e314dbdcSPavel Emelyanov err = register_netdevice(dev); 418e314dbdcSPavel Emelyanov if (err < 0) 419e314dbdcSPavel Emelyanov goto err_register_dev; 420e314dbdcSPavel Emelyanov 421e314dbdcSPavel Emelyanov netif_carrier_off(dev); 422e314dbdcSPavel Emelyanov 423e314dbdcSPavel Emelyanov /* 424e314dbdcSPavel Emelyanov * tie the deviced together 425e314dbdcSPavel Emelyanov */ 426e314dbdcSPavel Emelyanov 427e314dbdcSPavel Emelyanov priv = netdev_priv(dev); 428e314dbdcSPavel Emelyanov priv->peer = peer; 429e314dbdcSPavel Emelyanov 430e314dbdcSPavel Emelyanov priv = netdev_priv(peer); 431e314dbdcSPavel Emelyanov priv->peer = dev; 432e314dbdcSPavel Emelyanov return 0; 433e314dbdcSPavel Emelyanov 434e314dbdcSPavel Emelyanov err_register_dev: 435e314dbdcSPavel Emelyanov /* nothing to do */ 436e314dbdcSPavel Emelyanov err_alloc_name: 4373729d502SPatrick McHardy err_configure_peer: 438e314dbdcSPavel Emelyanov unregister_netdevice(peer); 439e314dbdcSPavel Emelyanov return err; 440e314dbdcSPavel Emelyanov 441e314dbdcSPavel Emelyanov err_register_peer: 442e314dbdcSPavel Emelyanov free_netdev(peer); 443e314dbdcSPavel Emelyanov return err; 444e314dbdcSPavel Emelyanov } 445e314dbdcSPavel Emelyanov 44623289a37SEric Dumazet static void veth_dellink(struct net_device *dev, struct list_head *head) 447e314dbdcSPavel Emelyanov { 448e314dbdcSPavel Emelyanov struct veth_priv *priv; 449e314dbdcSPavel Emelyanov struct net_device *peer; 450e314dbdcSPavel Emelyanov 451e314dbdcSPavel Emelyanov priv = netdev_priv(dev); 452e314dbdcSPavel Emelyanov peer = priv->peer; 453e314dbdcSPavel Emelyanov 45424540535SEric Dumazet unregister_netdevice_queue(dev, head); 45524540535SEric Dumazet unregister_netdevice_queue(peer, head); 456e314dbdcSPavel Emelyanov } 457e314dbdcSPavel Emelyanov 458e314dbdcSPavel Emelyanov static const struct nla_policy veth_policy[VETH_INFO_MAX + 1]; 459e314dbdcSPavel Emelyanov 460e314dbdcSPavel Emelyanov static struct rtnl_link_ops veth_link_ops = { 461e314dbdcSPavel Emelyanov .kind = DRV_NAME, 462e314dbdcSPavel Emelyanov .priv_size = sizeof(struct veth_priv), 463e314dbdcSPavel Emelyanov .setup = veth_setup, 464e314dbdcSPavel Emelyanov .validate = veth_validate, 465e314dbdcSPavel Emelyanov .newlink = veth_newlink, 466e314dbdcSPavel Emelyanov .dellink = veth_dellink, 467e314dbdcSPavel Emelyanov .policy = veth_policy, 468e314dbdcSPavel Emelyanov .maxtype = VETH_INFO_MAX, 469e314dbdcSPavel Emelyanov }; 470e314dbdcSPavel Emelyanov 471e314dbdcSPavel Emelyanov /* 472e314dbdcSPavel Emelyanov * init/fini 473e314dbdcSPavel Emelyanov */ 474e314dbdcSPavel Emelyanov 475e314dbdcSPavel Emelyanov static __init int veth_init(void) 476e314dbdcSPavel Emelyanov { 477e314dbdcSPavel Emelyanov return rtnl_link_register(&veth_link_ops); 478e314dbdcSPavel Emelyanov } 479e314dbdcSPavel Emelyanov 480e314dbdcSPavel Emelyanov static __exit void veth_exit(void) 481e314dbdcSPavel Emelyanov { 48268365458SPatrick McHardy rtnl_link_unregister(&veth_link_ops); 483e314dbdcSPavel Emelyanov } 484e314dbdcSPavel Emelyanov 485e314dbdcSPavel Emelyanov module_init(veth_init); 486e314dbdcSPavel Emelyanov module_exit(veth_exit); 487e314dbdcSPavel Emelyanov 488e314dbdcSPavel Emelyanov MODULE_DESCRIPTION("Virtual Ethernet Tunnel"); 489e314dbdcSPavel Emelyanov MODULE_LICENSE("GPL v2"); 490e314dbdcSPavel Emelyanov MODULE_ALIAS_RTNL_LINK(DRV_NAME); 491