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> 15cf05c700SEric Dumazet #include <linux/u64_stats_sync.h> 16e314dbdcSPavel Emelyanov 17e314dbdcSPavel Emelyanov #include <net/dst.h> 18e314dbdcSPavel Emelyanov #include <net/xfrm.h> 19ecef969eSStephen Hemminger #include <linux/veth.h> 209d9779e7SPaul Gortmaker #include <linux/module.h> 21e314dbdcSPavel Emelyanov 22e314dbdcSPavel Emelyanov #define DRV_NAME "veth" 23e314dbdcSPavel Emelyanov #define DRV_VERSION "1.0" 24e314dbdcSPavel Emelyanov 2538d40815SEric Biederman #define MIN_MTU 68 /* Min L3 MTU */ 2638d40815SEric Biederman #define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */ 2738d40815SEric Biederman 282681128fSEric Dumazet struct pcpu_vstats { 292681128fSEric Dumazet u64 packets; 302681128fSEric Dumazet u64 bytes; 31cf05c700SEric Dumazet struct u64_stats_sync syncp; 32e314dbdcSPavel Emelyanov }; 33e314dbdcSPavel Emelyanov 34e314dbdcSPavel Emelyanov struct veth_priv { 35d0e2c55eSEric Dumazet struct net_device __rcu *peer; 362681128fSEric Dumazet atomic64_t dropped; 37e314dbdcSPavel Emelyanov }; 38e314dbdcSPavel Emelyanov 39e314dbdcSPavel Emelyanov /* 40e314dbdcSPavel Emelyanov * ethtool interface 41e314dbdcSPavel Emelyanov */ 42e314dbdcSPavel Emelyanov 43e314dbdcSPavel Emelyanov static struct { 44e314dbdcSPavel Emelyanov const char string[ETH_GSTRING_LEN]; 45e314dbdcSPavel Emelyanov } ethtool_stats_keys[] = { 46e314dbdcSPavel Emelyanov { "peer_ifindex" }, 47e314dbdcSPavel Emelyanov }; 48e314dbdcSPavel Emelyanov 49e314dbdcSPavel Emelyanov static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 50e314dbdcSPavel Emelyanov { 51e314dbdcSPavel Emelyanov cmd->supported = 0; 52e314dbdcSPavel Emelyanov cmd->advertising = 0; 5370739497SDavid Decotigny ethtool_cmd_speed_set(cmd, SPEED_10000); 54e314dbdcSPavel Emelyanov cmd->duplex = DUPLEX_FULL; 55e314dbdcSPavel Emelyanov cmd->port = PORT_TP; 56e314dbdcSPavel Emelyanov cmd->phy_address = 0; 57e314dbdcSPavel Emelyanov cmd->transceiver = XCVR_INTERNAL; 58e314dbdcSPavel Emelyanov cmd->autoneg = AUTONEG_DISABLE; 59e314dbdcSPavel Emelyanov cmd->maxtxpkt = 0; 60e314dbdcSPavel Emelyanov cmd->maxrxpkt = 0; 61e314dbdcSPavel Emelyanov return 0; 62e314dbdcSPavel Emelyanov } 63e314dbdcSPavel Emelyanov 64e314dbdcSPavel Emelyanov static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) 65e314dbdcSPavel Emelyanov { 6633a5ba14SRick Jones strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); 6733a5ba14SRick Jones strlcpy(info->version, DRV_VERSION, sizeof(info->version)); 68e314dbdcSPavel Emelyanov } 69e314dbdcSPavel Emelyanov 70e314dbdcSPavel Emelyanov static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf) 71e314dbdcSPavel Emelyanov { 72e314dbdcSPavel Emelyanov switch(stringset) { 73e314dbdcSPavel Emelyanov case ETH_SS_STATS: 74e314dbdcSPavel Emelyanov memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys)); 75e314dbdcSPavel Emelyanov break; 76e314dbdcSPavel Emelyanov } 77e314dbdcSPavel Emelyanov } 78e314dbdcSPavel Emelyanov 79b9f2c044SJeff Garzik static int veth_get_sset_count(struct net_device *dev, int sset) 80e314dbdcSPavel Emelyanov { 81b9f2c044SJeff Garzik switch (sset) { 82b9f2c044SJeff Garzik case ETH_SS_STATS: 83e314dbdcSPavel Emelyanov return ARRAY_SIZE(ethtool_stats_keys); 84b9f2c044SJeff Garzik default: 85b9f2c044SJeff Garzik return -EOPNOTSUPP; 86b9f2c044SJeff Garzik } 87e314dbdcSPavel Emelyanov } 88e314dbdcSPavel Emelyanov 89e314dbdcSPavel Emelyanov static void veth_get_ethtool_stats(struct net_device *dev, 90e314dbdcSPavel Emelyanov struct ethtool_stats *stats, u64 *data) 91e314dbdcSPavel Emelyanov { 92d0e2c55eSEric Dumazet struct veth_priv *priv = netdev_priv(dev); 93d0e2c55eSEric Dumazet struct net_device *peer = rtnl_dereference(priv->peer); 94e314dbdcSPavel Emelyanov 95d0e2c55eSEric Dumazet data[0] = peer ? peer->ifindex : 0; 96e314dbdcSPavel Emelyanov } 97e314dbdcSPavel Emelyanov 980fc0b732SStephen Hemminger static const struct ethtool_ops veth_ethtool_ops = { 99e314dbdcSPavel Emelyanov .get_settings = veth_get_settings, 100e314dbdcSPavel Emelyanov .get_drvinfo = veth_get_drvinfo, 101e314dbdcSPavel Emelyanov .get_link = ethtool_op_get_link, 102e314dbdcSPavel Emelyanov .get_strings = veth_get_strings, 103b9f2c044SJeff Garzik .get_sset_count = veth_get_sset_count, 104e314dbdcSPavel Emelyanov .get_ethtool_stats = veth_get_ethtool_stats, 105e314dbdcSPavel Emelyanov }; 106e314dbdcSPavel Emelyanov 107424efe9cSStephen Hemminger static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev) 108e314dbdcSPavel Emelyanov { 1092681128fSEric Dumazet struct veth_priv *priv = netdev_priv(dev); 110d0e2c55eSEric Dumazet struct net_device *rcv; 1112681128fSEric Dumazet int length = skb->len; 112e314dbdcSPavel Emelyanov 113d0e2c55eSEric Dumazet rcu_read_lock(); 114d0e2c55eSEric Dumazet rcv = rcu_dereference(priv->peer); 115d0e2c55eSEric Dumazet if (unlikely(!rcv)) { 116d0e2c55eSEric Dumazet kfree_skb(skb); 117d0e2c55eSEric Dumazet goto drop; 118d0e2c55eSEric Dumazet } 1190b796750SMichał Mirosław /* don't change ip_summed == CHECKSUM_PARTIAL, as that 1202681128fSEric Dumazet * will cause bad checksum on forwarded packets 1212681128fSEric Dumazet */ 122a2c725faSMichał Mirosław if (skb->ip_summed == CHECKSUM_NONE && 123a2c725faSMichał Mirosław rcv->features & NETIF_F_RXCSUM) 124a2c725faSMichał Mirosław skb->ip_summed = CHECKSUM_UNNECESSARY; 125e314dbdcSPavel Emelyanov 1262681128fSEric Dumazet if (likely(dev_forward_skb(rcv, skb) == NET_RX_SUCCESS)) { 1272681128fSEric Dumazet struct pcpu_vstats *stats = this_cpu_ptr(dev->vstats); 128e314dbdcSPavel Emelyanov 129cf05c700SEric Dumazet u64_stats_update_begin(&stats->syncp); 1302681128fSEric Dumazet stats->bytes += length; 1312681128fSEric Dumazet stats->packets++; 132cf05c700SEric Dumazet u64_stats_update_end(&stats->syncp); 1332681128fSEric Dumazet } else { 134d0e2c55eSEric Dumazet drop: 1352681128fSEric Dumazet atomic64_inc(&priv->dropped); 1362681128fSEric Dumazet } 137d0e2c55eSEric Dumazet rcu_read_unlock(); 1386ed10654SPatrick McHardy return NETDEV_TX_OK; 139e314dbdcSPavel Emelyanov } 140e314dbdcSPavel Emelyanov 141e314dbdcSPavel Emelyanov /* 142e314dbdcSPavel Emelyanov * general routines 143e314dbdcSPavel Emelyanov */ 144e314dbdcSPavel Emelyanov 1452681128fSEric Dumazet static u64 veth_stats_one(struct pcpu_vstats *result, struct net_device *dev) 146e314dbdcSPavel Emelyanov { 147cf05c700SEric Dumazet struct veth_priv *priv = netdev_priv(dev); 14811687a10SDavid S. Miller int cpu; 14911687a10SDavid S. Miller 1502681128fSEric Dumazet result->packets = 0; 1512681128fSEric Dumazet result->bytes = 0; 1522b1c8b0fSEric Dumazet for_each_possible_cpu(cpu) { 1532681128fSEric Dumazet struct pcpu_vstats *stats = per_cpu_ptr(dev->vstats, cpu); 1542681128fSEric Dumazet u64 packets, bytes; 155cf05c700SEric Dumazet unsigned int start; 156e314dbdcSPavel Emelyanov 157cf05c700SEric Dumazet do { 158cf05c700SEric Dumazet start = u64_stats_fetch_begin_bh(&stats->syncp); 1592681128fSEric Dumazet packets = stats->packets; 1602681128fSEric Dumazet bytes = stats->bytes; 161cf05c700SEric Dumazet } while (u64_stats_fetch_retry_bh(&stats->syncp, start)); 1622681128fSEric Dumazet result->packets += packets; 1632681128fSEric Dumazet result->bytes += bytes; 164e314dbdcSPavel Emelyanov } 1652681128fSEric Dumazet return atomic64_read(&priv->dropped); 1662681128fSEric Dumazet } 1672681128fSEric Dumazet 1682681128fSEric Dumazet static struct rtnl_link_stats64 *veth_get_stats64(struct net_device *dev, 1692681128fSEric Dumazet struct rtnl_link_stats64 *tot) 1702681128fSEric Dumazet { 1712681128fSEric Dumazet struct veth_priv *priv = netdev_priv(dev); 172d0e2c55eSEric Dumazet struct net_device *peer; 1732681128fSEric Dumazet struct pcpu_vstats one; 1742681128fSEric Dumazet 1752681128fSEric Dumazet tot->tx_dropped = veth_stats_one(&one, dev); 1762681128fSEric Dumazet tot->tx_bytes = one.bytes; 1772681128fSEric Dumazet tot->tx_packets = one.packets; 1782681128fSEric Dumazet 179d0e2c55eSEric Dumazet rcu_read_lock(); 180d0e2c55eSEric Dumazet peer = rcu_dereference(priv->peer); 181d0e2c55eSEric Dumazet if (peer) { 182d0e2c55eSEric Dumazet tot->rx_dropped = veth_stats_one(&one, peer); 1832681128fSEric Dumazet tot->rx_bytes = one.bytes; 1842681128fSEric Dumazet tot->rx_packets = one.packets; 185d0e2c55eSEric Dumazet } 186d0e2c55eSEric Dumazet rcu_read_unlock(); 187e314dbdcSPavel Emelyanov 1886311cc44Sstephen hemminger return tot; 189e314dbdcSPavel Emelyanov } 190e314dbdcSPavel Emelyanov 191e314dbdcSPavel Emelyanov static int veth_open(struct net_device *dev) 192e314dbdcSPavel Emelyanov { 193d0e2c55eSEric Dumazet struct veth_priv *priv = netdev_priv(dev); 194d0e2c55eSEric Dumazet struct net_device *peer = rtnl_dereference(priv->peer); 195e314dbdcSPavel Emelyanov 196d0e2c55eSEric Dumazet if (!peer) 197e314dbdcSPavel Emelyanov return -ENOTCONN; 198e314dbdcSPavel Emelyanov 199d0e2c55eSEric Dumazet if (peer->flags & IFF_UP) { 200e314dbdcSPavel Emelyanov netif_carrier_on(dev); 201d0e2c55eSEric Dumazet netif_carrier_on(peer); 202e314dbdcSPavel Emelyanov } 203e314dbdcSPavel Emelyanov return 0; 204e314dbdcSPavel Emelyanov } 205e314dbdcSPavel Emelyanov 2062cf48a10SEric W. Biederman static int veth_close(struct net_device *dev) 2072cf48a10SEric W. Biederman { 2082cf48a10SEric W. Biederman struct veth_priv *priv = netdev_priv(dev); 2092efd32eeSEric Dumazet struct net_device *peer = rtnl_dereference(priv->peer); 2102cf48a10SEric W. Biederman 2112cf48a10SEric W. Biederman netif_carrier_off(dev); 2122efd32eeSEric Dumazet if (peer) 2132efd32eeSEric Dumazet netif_carrier_off(peer); 2142cf48a10SEric W. Biederman 2152cf48a10SEric W. Biederman return 0; 2162cf48a10SEric W. Biederman } 2172cf48a10SEric W. Biederman 21838d40815SEric Biederman static int is_valid_veth_mtu(int new_mtu) 21938d40815SEric Biederman { 220807540baSEric Dumazet return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU; 22138d40815SEric Biederman } 22238d40815SEric Biederman 22338d40815SEric Biederman static int veth_change_mtu(struct net_device *dev, int new_mtu) 22438d40815SEric Biederman { 22538d40815SEric Biederman if (!is_valid_veth_mtu(new_mtu)) 22638d40815SEric Biederman return -EINVAL; 22738d40815SEric Biederman dev->mtu = new_mtu; 22838d40815SEric Biederman return 0; 22938d40815SEric Biederman } 23038d40815SEric Biederman 231e314dbdcSPavel Emelyanov static int veth_dev_init(struct net_device *dev) 232e314dbdcSPavel Emelyanov { 2332681128fSEric Dumazet dev->vstats = alloc_percpu(struct pcpu_vstats); 2342681128fSEric Dumazet if (!dev->vstats) 235e314dbdcSPavel Emelyanov return -ENOMEM; 236e314dbdcSPavel Emelyanov 237e314dbdcSPavel Emelyanov return 0; 238e314dbdcSPavel Emelyanov } 239e314dbdcSPavel Emelyanov 24011687a10SDavid S. Miller static void veth_dev_free(struct net_device *dev) 24111687a10SDavid S. Miller { 2422681128fSEric Dumazet free_percpu(dev->vstats); 24311687a10SDavid S. Miller free_netdev(dev); 24411687a10SDavid S. Miller } 24511687a10SDavid S. Miller 2464456e7bdSStephen Hemminger static const struct net_device_ops veth_netdev_ops = { 2474456e7bdSStephen Hemminger .ndo_init = veth_dev_init, 2484456e7bdSStephen Hemminger .ndo_open = veth_open, 2492cf48a10SEric W. Biederman .ndo_stop = veth_close, 25000829823SStephen Hemminger .ndo_start_xmit = veth_xmit, 25138d40815SEric Biederman .ndo_change_mtu = veth_change_mtu, 2526311cc44Sstephen hemminger .ndo_get_stats64 = veth_get_stats64, 253ee923623SDaniel Lezcano .ndo_set_mac_address = eth_mac_addr, 2544456e7bdSStephen Hemminger }; 2554456e7bdSStephen Hemminger 2568093315aSEric Dumazet #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ 2578093315aSEric Dumazet NETIF_F_HW_CSUM | NETIF_F_RXCSUM | NETIF_F_HIGHDMA | \ 2588093315aSEric Dumazet NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX) 2598093315aSEric Dumazet 260e314dbdcSPavel Emelyanov static void veth_setup(struct net_device *dev) 261e314dbdcSPavel Emelyanov { 262e314dbdcSPavel Emelyanov ether_setup(dev); 263e314dbdcSPavel Emelyanov 264550fd08cSNeil Horman dev->priv_flags &= ~IFF_TX_SKB_SHARING; 26523ea5a96SHannes Frederic Sowa dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; 266550fd08cSNeil Horman 2674456e7bdSStephen Hemminger dev->netdev_ops = &veth_netdev_ops; 268e314dbdcSPavel Emelyanov dev->ethtool_ops = &veth_ethtool_ops; 269e314dbdcSPavel Emelyanov dev->features |= NETIF_F_LLTX; 2708093315aSEric Dumazet dev->features |= VETH_FEATURES; 27111687a10SDavid S. Miller dev->destructor = veth_dev_free; 272a2c725faSMichał Mirosław 2738093315aSEric Dumazet dev->hw_features = VETH_FEATURES; 274e314dbdcSPavel Emelyanov } 275e314dbdcSPavel Emelyanov 276e314dbdcSPavel Emelyanov /* 277e314dbdcSPavel Emelyanov * netlink interface 278e314dbdcSPavel Emelyanov */ 279e314dbdcSPavel Emelyanov 280e314dbdcSPavel Emelyanov static int veth_validate(struct nlattr *tb[], struct nlattr *data[]) 281e314dbdcSPavel Emelyanov { 282e314dbdcSPavel Emelyanov if (tb[IFLA_ADDRESS]) { 283e314dbdcSPavel Emelyanov if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 284e314dbdcSPavel Emelyanov return -EINVAL; 285e314dbdcSPavel Emelyanov if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 286e314dbdcSPavel Emelyanov return -EADDRNOTAVAIL; 287e314dbdcSPavel Emelyanov } 28838d40815SEric Biederman if (tb[IFLA_MTU]) { 28938d40815SEric Biederman if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU]))) 29038d40815SEric Biederman return -EINVAL; 29138d40815SEric Biederman } 292e314dbdcSPavel Emelyanov return 0; 293e314dbdcSPavel Emelyanov } 294e314dbdcSPavel Emelyanov 295e314dbdcSPavel Emelyanov static struct rtnl_link_ops veth_link_ops; 296e314dbdcSPavel Emelyanov 29781adee47SEric W. Biederman static int veth_newlink(struct net *src_net, struct net_device *dev, 298e314dbdcSPavel Emelyanov struct nlattr *tb[], struct nlattr *data[]) 299e314dbdcSPavel Emelyanov { 300e314dbdcSPavel Emelyanov int err; 301e314dbdcSPavel Emelyanov struct net_device *peer; 302e314dbdcSPavel Emelyanov struct veth_priv *priv; 303e314dbdcSPavel Emelyanov char ifname[IFNAMSIZ]; 304e314dbdcSPavel Emelyanov struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; 3053729d502SPatrick McHardy struct ifinfomsg *ifmp; 30681adee47SEric W. Biederman struct net *net; 307e314dbdcSPavel Emelyanov 308e314dbdcSPavel Emelyanov /* 309e314dbdcSPavel Emelyanov * create and register peer first 310e314dbdcSPavel Emelyanov */ 311e314dbdcSPavel Emelyanov if (data != NULL && data[VETH_INFO_PEER] != NULL) { 312e314dbdcSPavel Emelyanov struct nlattr *nla_peer; 313e314dbdcSPavel Emelyanov 314e314dbdcSPavel Emelyanov nla_peer = data[VETH_INFO_PEER]; 3153729d502SPatrick McHardy ifmp = nla_data(nla_peer); 316e314dbdcSPavel Emelyanov err = nla_parse(peer_tb, IFLA_MAX, 317e314dbdcSPavel Emelyanov nla_data(nla_peer) + sizeof(struct ifinfomsg), 318e314dbdcSPavel Emelyanov nla_len(nla_peer) - sizeof(struct ifinfomsg), 319e314dbdcSPavel Emelyanov ifla_policy); 320e314dbdcSPavel Emelyanov if (err < 0) 321e314dbdcSPavel Emelyanov return err; 322e314dbdcSPavel Emelyanov 323e314dbdcSPavel Emelyanov err = veth_validate(peer_tb, NULL); 324e314dbdcSPavel Emelyanov if (err < 0) 325e314dbdcSPavel Emelyanov return err; 326e314dbdcSPavel Emelyanov 327e314dbdcSPavel Emelyanov tbp = peer_tb; 3283729d502SPatrick McHardy } else { 3293729d502SPatrick McHardy ifmp = NULL; 330e314dbdcSPavel Emelyanov tbp = tb; 3313729d502SPatrick McHardy } 332e314dbdcSPavel Emelyanov 333e314dbdcSPavel Emelyanov if (tbp[IFLA_IFNAME]) 334e314dbdcSPavel Emelyanov nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); 335e314dbdcSPavel Emelyanov else 336e314dbdcSPavel Emelyanov snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); 337e314dbdcSPavel Emelyanov 33881adee47SEric W. Biederman net = rtnl_link_get_net(src_net, tbp); 33981adee47SEric W. Biederman if (IS_ERR(net)) 34081adee47SEric W. Biederman return PTR_ERR(net); 34181adee47SEric W. Biederman 342c0713563SRami Rosen peer = rtnl_create_link(net, ifname, &veth_link_ops, tbp); 34381adee47SEric W. Biederman if (IS_ERR(peer)) { 34481adee47SEric W. Biederman put_net(net); 345e314dbdcSPavel Emelyanov return PTR_ERR(peer); 34681adee47SEric W. Biederman } 347e314dbdcSPavel Emelyanov 348e314dbdcSPavel Emelyanov if (tbp[IFLA_ADDRESS] == NULL) 349f2cedb63SDanny Kukawka eth_hw_addr_random(peer); 350e314dbdcSPavel Emelyanov 351e6f8f1a7SPavel Emelyanov if (ifmp && (dev->ifindex != 0)) 352e6f8f1a7SPavel Emelyanov peer->ifindex = ifmp->ifi_index; 353e6f8f1a7SPavel Emelyanov 354e314dbdcSPavel Emelyanov err = register_netdevice(peer); 35581adee47SEric W. Biederman put_net(net); 35681adee47SEric W. Biederman net = NULL; 357e314dbdcSPavel Emelyanov if (err < 0) 358e314dbdcSPavel Emelyanov goto err_register_peer; 359e314dbdcSPavel Emelyanov 360e314dbdcSPavel Emelyanov netif_carrier_off(peer); 361e314dbdcSPavel Emelyanov 3623729d502SPatrick McHardy err = rtnl_configure_link(peer, ifmp); 3633729d502SPatrick McHardy if (err < 0) 3643729d502SPatrick McHardy goto err_configure_peer; 3653729d502SPatrick McHardy 366e314dbdcSPavel Emelyanov /* 367e314dbdcSPavel Emelyanov * register dev last 368e314dbdcSPavel Emelyanov * 369e314dbdcSPavel Emelyanov * note, that since we've registered new device the dev's name 370e314dbdcSPavel Emelyanov * should be re-allocated 371e314dbdcSPavel Emelyanov */ 372e314dbdcSPavel Emelyanov 373e314dbdcSPavel Emelyanov if (tb[IFLA_ADDRESS] == NULL) 374f2cedb63SDanny Kukawka eth_hw_addr_random(dev); 375e314dbdcSPavel Emelyanov 3766c8c4446SJiri Pirko if (tb[IFLA_IFNAME]) 3776c8c4446SJiri Pirko nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); 3786c8c4446SJiri Pirko else 3796c8c4446SJiri Pirko snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); 3806c8c4446SJiri Pirko 3816c8c4446SJiri Pirko if (strchr(dev->name, '%')) { 3826c8c4446SJiri Pirko err = dev_alloc_name(dev, dev->name); 3836c8c4446SJiri Pirko if (err < 0) 3846c8c4446SJiri Pirko goto err_alloc_name; 3856c8c4446SJiri Pirko } 3866c8c4446SJiri Pirko 387e314dbdcSPavel Emelyanov err = register_netdevice(dev); 388e314dbdcSPavel Emelyanov if (err < 0) 389e314dbdcSPavel Emelyanov goto err_register_dev; 390e314dbdcSPavel Emelyanov 391e314dbdcSPavel Emelyanov netif_carrier_off(dev); 392e314dbdcSPavel Emelyanov 393e314dbdcSPavel Emelyanov /* 394e314dbdcSPavel Emelyanov * tie the deviced together 395e314dbdcSPavel Emelyanov */ 396e314dbdcSPavel Emelyanov 397e314dbdcSPavel Emelyanov priv = netdev_priv(dev); 398d0e2c55eSEric Dumazet rcu_assign_pointer(priv->peer, peer); 399e314dbdcSPavel Emelyanov 400e314dbdcSPavel Emelyanov priv = netdev_priv(peer); 401d0e2c55eSEric Dumazet rcu_assign_pointer(priv->peer, dev); 402e314dbdcSPavel Emelyanov return 0; 403e314dbdcSPavel Emelyanov 404e314dbdcSPavel Emelyanov err_register_dev: 405e314dbdcSPavel Emelyanov /* nothing to do */ 4066c8c4446SJiri Pirko err_alloc_name: 4073729d502SPatrick McHardy err_configure_peer: 408e314dbdcSPavel Emelyanov unregister_netdevice(peer); 409e314dbdcSPavel Emelyanov return err; 410e314dbdcSPavel Emelyanov 411e314dbdcSPavel Emelyanov err_register_peer: 412e314dbdcSPavel Emelyanov free_netdev(peer); 413e314dbdcSPavel Emelyanov return err; 414e314dbdcSPavel Emelyanov } 415e314dbdcSPavel Emelyanov 41623289a37SEric Dumazet static void veth_dellink(struct net_device *dev, struct list_head *head) 417e314dbdcSPavel Emelyanov { 418e314dbdcSPavel Emelyanov struct veth_priv *priv; 419e314dbdcSPavel Emelyanov struct net_device *peer; 420e314dbdcSPavel Emelyanov 421e314dbdcSPavel Emelyanov priv = netdev_priv(dev); 422d0e2c55eSEric Dumazet peer = rtnl_dereference(priv->peer); 423d0e2c55eSEric Dumazet 424d0e2c55eSEric Dumazet /* Note : dellink() is called from default_device_exit_batch(), 425d0e2c55eSEric Dumazet * before a rcu_synchronize() point. The devices are guaranteed 426d0e2c55eSEric Dumazet * not being freed before one RCU grace period. 427d0e2c55eSEric Dumazet */ 428d0e2c55eSEric Dumazet RCU_INIT_POINTER(priv->peer, NULL); 429d0e2c55eSEric Dumazet 430d0e2c55eSEric Dumazet priv = netdev_priv(peer); 431d0e2c55eSEric Dumazet RCU_INIT_POINTER(priv->peer, NULL); 432e314dbdcSPavel Emelyanov 43324540535SEric Dumazet unregister_netdevice_queue(dev, head); 43424540535SEric Dumazet unregister_netdevice_queue(peer, head); 435e314dbdcSPavel Emelyanov } 436e314dbdcSPavel Emelyanov 43723711438SThomas Graf static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = { 43823711438SThomas Graf [VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) }, 43923711438SThomas Graf }; 440e314dbdcSPavel Emelyanov 441e314dbdcSPavel Emelyanov static struct rtnl_link_ops veth_link_ops = { 442e314dbdcSPavel Emelyanov .kind = DRV_NAME, 443e314dbdcSPavel Emelyanov .priv_size = sizeof(struct veth_priv), 444e314dbdcSPavel Emelyanov .setup = veth_setup, 445e314dbdcSPavel Emelyanov .validate = veth_validate, 446e314dbdcSPavel Emelyanov .newlink = veth_newlink, 447e314dbdcSPavel Emelyanov .dellink = veth_dellink, 448e314dbdcSPavel Emelyanov .policy = veth_policy, 449e314dbdcSPavel Emelyanov .maxtype = VETH_INFO_MAX, 450e314dbdcSPavel Emelyanov }; 451e314dbdcSPavel Emelyanov 452e314dbdcSPavel Emelyanov /* 453e314dbdcSPavel Emelyanov * init/fini 454e314dbdcSPavel Emelyanov */ 455e314dbdcSPavel Emelyanov 456e314dbdcSPavel Emelyanov static __init int veth_init(void) 457e314dbdcSPavel Emelyanov { 458e314dbdcSPavel Emelyanov return rtnl_link_register(&veth_link_ops); 459e314dbdcSPavel Emelyanov } 460e314dbdcSPavel Emelyanov 461e314dbdcSPavel Emelyanov static __exit void veth_exit(void) 462e314dbdcSPavel Emelyanov { 46368365458SPatrick McHardy rtnl_link_unregister(&veth_link_ops); 464e314dbdcSPavel Emelyanov } 465e314dbdcSPavel Emelyanov 466e314dbdcSPavel Emelyanov module_init(veth_init); 467e314dbdcSPavel Emelyanov module_exit(veth_exit); 468e314dbdcSPavel Emelyanov 469e314dbdcSPavel Emelyanov MODULE_DESCRIPTION("Virtual Ethernet Tunnel"); 470e314dbdcSPavel Emelyanov MODULE_LICENSE("GPL v2"); 471e314dbdcSPavel Emelyanov MODULE_ALIAS_RTNL_LINK(DRV_NAME); 472