Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/net/veth.c |
| 3 | * |
| 4 | * Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc |
| 5 | * |
| 6 | * Author: Pavel Emelianov <xemul@openvz.org> |
| 7 | * Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com> |
| 8 | * |
| 9 | */ |
| 10 | |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 11 | #include <linux/netdevice.h> |
| 12 | #include <linux/ethtool.h> |
| 13 | #include <linux/etherdevice.h> |
| 14 | |
| 15 | #include <net/dst.h> |
| 16 | #include <net/xfrm.h> |
Stephen Hemminger | ecef969 | 2007-12-25 17:23:59 -0800 | [diff] [blame] | 17 | #include <linux/veth.h> |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 18 | |
| 19 | #define DRV_NAME "veth" |
| 20 | #define DRV_VERSION "1.0" |
| 21 | |
Eric Biederman | 38d4081 | 2009-03-03 23:36:04 -0800 | [diff] [blame] | 22 | #define MIN_MTU 68 /* Min L3 MTU */ |
| 23 | #define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */ |
| 24 | #define MTU_PAD (ETH_HLEN + 4) /* Max difference between L2 and L3 size MTU */ |
| 25 | |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 26 | struct veth_net_stats { |
| 27 | unsigned long rx_packets; |
| 28 | unsigned long tx_packets; |
| 29 | unsigned long rx_bytes; |
| 30 | unsigned long tx_bytes; |
| 31 | unsigned long tx_dropped; |
Eric Biederman | 38d4081 | 2009-03-03 23:36:04 -0800 | [diff] [blame] | 32 | unsigned long rx_dropped; |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 33 | }; |
| 34 | |
| 35 | struct veth_priv { |
| 36 | struct net_device *peer; |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 37 | struct veth_net_stats *stats; |
| 38 | unsigned ip_summed; |
| 39 | }; |
| 40 | |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 41 | /* |
| 42 | * ethtool interface |
| 43 | */ |
| 44 | |
| 45 | static struct { |
| 46 | const char string[ETH_GSTRING_LEN]; |
| 47 | } ethtool_stats_keys[] = { |
| 48 | { "peer_ifindex" }, |
| 49 | }; |
| 50 | |
| 51 | static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) |
| 52 | { |
| 53 | cmd->supported = 0; |
| 54 | cmd->advertising = 0; |
| 55 | cmd->speed = SPEED_10000; |
| 56 | cmd->duplex = DUPLEX_FULL; |
| 57 | cmd->port = PORT_TP; |
| 58 | cmd->phy_address = 0; |
| 59 | cmd->transceiver = XCVR_INTERNAL; |
| 60 | cmd->autoneg = AUTONEG_DISABLE; |
| 61 | cmd->maxtxpkt = 0; |
| 62 | cmd->maxrxpkt = 0; |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) |
| 67 | { |
| 68 | strcpy(info->driver, DRV_NAME); |
| 69 | strcpy(info->version, DRV_VERSION); |
| 70 | strcpy(info->fw_version, "N/A"); |
| 71 | } |
| 72 | |
| 73 | static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf) |
| 74 | { |
| 75 | switch(stringset) { |
| 76 | case ETH_SS_STATS: |
| 77 | memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys)); |
| 78 | break; |
| 79 | } |
| 80 | } |
| 81 | |
Jeff Garzik | b9f2c04 | 2007-10-03 18:07:32 -0700 | [diff] [blame] | 82 | static int veth_get_sset_count(struct net_device *dev, int sset) |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 83 | { |
Jeff Garzik | b9f2c04 | 2007-10-03 18:07:32 -0700 | [diff] [blame] | 84 | switch (sset) { |
| 85 | case ETH_SS_STATS: |
| 86 | return ARRAY_SIZE(ethtool_stats_keys); |
| 87 | default: |
| 88 | return -EOPNOTSUPP; |
| 89 | } |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 90 | } |
| 91 | |
| 92 | static void veth_get_ethtool_stats(struct net_device *dev, |
| 93 | struct ethtool_stats *stats, u64 *data) |
| 94 | { |
| 95 | struct veth_priv *priv; |
| 96 | |
| 97 | priv = netdev_priv(dev); |
| 98 | data[0] = priv->peer->ifindex; |
| 99 | } |
| 100 | |
| 101 | static u32 veth_get_rx_csum(struct net_device *dev) |
| 102 | { |
| 103 | struct veth_priv *priv; |
| 104 | |
| 105 | priv = netdev_priv(dev); |
| 106 | return priv->ip_summed == CHECKSUM_UNNECESSARY; |
| 107 | } |
| 108 | |
| 109 | static int veth_set_rx_csum(struct net_device *dev, u32 data) |
| 110 | { |
| 111 | struct veth_priv *priv; |
| 112 | |
| 113 | priv = netdev_priv(dev); |
| 114 | priv->ip_summed = data ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE; |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | static u32 veth_get_tx_csum(struct net_device *dev) |
| 119 | { |
| 120 | return (dev->features & NETIF_F_NO_CSUM) != 0; |
| 121 | } |
| 122 | |
| 123 | static int veth_set_tx_csum(struct net_device *dev, u32 data) |
| 124 | { |
| 125 | if (data) |
| 126 | dev->features |= NETIF_F_NO_CSUM; |
| 127 | else |
| 128 | dev->features &= ~NETIF_F_NO_CSUM; |
| 129 | return 0; |
| 130 | } |
| 131 | |
Stephen Hemminger | 0fc0b73 | 2009-09-02 01:03:33 -0700 | [diff] [blame] | 132 | static const struct ethtool_ops veth_ethtool_ops = { |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 133 | .get_settings = veth_get_settings, |
| 134 | .get_drvinfo = veth_get_drvinfo, |
| 135 | .get_link = ethtool_op_get_link, |
| 136 | .get_rx_csum = veth_get_rx_csum, |
| 137 | .set_rx_csum = veth_set_rx_csum, |
| 138 | .get_tx_csum = veth_get_tx_csum, |
| 139 | .set_tx_csum = veth_set_tx_csum, |
| 140 | .get_sg = ethtool_op_get_sg, |
| 141 | .set_sg = ethtool_op_set_sg, |
| 142 | .get_strings = veth_get_strings, |
Jeff Garzik | b9f2c04 | 2007-10-03 18:07:32 -0700 | [diff] [blame] | 143 | .get_sset_count = veth_get_sset_count, |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 144 | .get_ethtool_stats = veth_get_ethtool_stats, |
| 145 | }; |
| 146 | |
| 147 | /* |
| 148 | * xmit |
| 149 | */ |
| 150 | |
Stephen Hemminger | 424efe9 | 2009-08-31 19:50:51 +0000 | [diff] [blame] | 151 | static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev) |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 152 | { |
| 153 | struct net_device *rcv = NULL; |
| 154 | struct veth_priv *priv, *rcv_priv; |
Eric Biederman | 38d4081 | 2009-03-03 23:36:04 -0800 | [diff] [blame] | 155 | struct veth_net_stats *stats, *rcv_stats; |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 156 | int length, cpu; |
| 157 | |
| 158 | skb_orphan(skb); |
| 159 | |
| 160 | priv = netdev_priv(dev); |
| 161 | rcv = priv->peer; |
| 162 | rcv_priv = netdev_priv(rcv); |
| 163 | |
| 164 | cpu = smp_processor_id(); |
| 165 | stats = per_cpu_ptr(priv->stats, cpu); |
Eric Biederman | 38d4081 | 2009-03-03 23:36:04 -0800 | [diff] [blame] | 166 | rcv_stats = per_cpu_ptr(rcv_priv->stats, cpu); |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 167 | |
| 168 | if (!(rcv->flags & IFF_UP)) |
Eric Biederman | 38d4081 | 2009-03-03 23:36:04 -0800 | [diff] [blame] | 169 | goto tx_drop; |
| 170 | |
| 171 | if (skb->len > (rcv->mtu + MTU_PAD)) |
| 172 | goto rx_drop; |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 173 | |
Ben Greear | 27a242e | 2009-07-21 12:50:02 -0700 | [diff] [blame] | 174 | skb->tstamp.tv64 = 0; |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 175 | skb->pkt_type = PACKET_HOST; |
| 176 | skb->protocol = eth_type_trans(skb, rcv); |
| 177 | if (dev->features & NETIF_F_NO_CSUM) |
| 178 | skb->ip_summed = rcv_priv->ip_summed; |
| 179 | |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 180 | skb->mark = 0; |
| 181 | secpath_reset(skb); |
| 182 | nf_reset(skb); |
| 183 | |
| 184 | length = skb->len; |
| 185 | |
| 186 | stats->tx_bytes += length; |
| 187 | stats->tx_packets++; |
| 188 | |
Eric Biederman | 38d4081 | 2009-03-03 23:36:04 -0800 | [diff] [blame] | 189 | rcv_stats->rx_bytes += length; |
| 190 | rcv_stats->rx_packets++; |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 191 | |
| 192 | netif_rx(skb); |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 193 | return NETDEV_TX_OK; |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 194 | |
Eric Biederman | 38d4081 | 2009-03-03 23:36:04 -0800 | [diff] [blame] | 195 | tx_drop: |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 196 | kfree_skb(skb); |
| 197 | stats->tx_dropped++; |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 198 | return NETDEV_TX_OK; |
Eric Biederman | 38d4081 | 2009-03-03 23:36:04 -0800 | [diff] [blame] | 199 | |
| 200 | rx_drop: |
| 201 | kfree_skb(skb); |
| 202 | rcv_stats->rx_dropped++; |
Patrick McHardy | 6ed1065 | 2009-06-23 06:03:08 +0000 | [diff] [blame] | 203 | return NETDEV_TX_OK; |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | /* |
| 207 | * general routines |
| 208 | */ |
| 209 | |
| 210 | static struct net_device_stats *veth_get_stats(struct net_device *dev) |
| 211 | { |
David S. Miller | 11687a1 | 2009-06-25 02:45:42 -0700 | [diff] [blame] | 212 | struct veth_priv *priv; |
| 213 | struct net_device_stats *dev_stats; |
| 214 | int cpu; |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 215 | struct veth_net_stats *stats; |
| 216 | |
David S. Miller | 11687a1 | 2009-06-25 02:45:42 -0700 | [diff] [blame] | 217 | priv = netdev_priv(dev); |
| 218 | dev_stats = &dev->stats; |
| 219 | |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 220 | dev_stats->rx_packets = 0; |
| 221 | dev_stats->tx_packets = 0; |
| 222 | dev_stats->rx_bytes = 0; |
| 223 | dev_stats->tx_bytes = 0; |
| 224 | dev_stats->tx_dropped = 0; |
Eric Biederman | 38d4081 | 2009-03-03 23:36:04 -0800 | [diff] [blame] | 225 | dev_stats->rx_dropped = 0; |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 226 | |
David S. Miller | 11687a1 | 2009-06-25 02:45:42 -0700 | [diff] [blame] | 227 | for_each_online_cpu(cpu) { |
| 228 | stats = per_cpu_ptr(priv->stats, cpu); |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 229 | |
David S. Miller | 11687a1 | 2009-06-25 02:45:42 -0700 | [diff] [blame] | 230 | dev_stats->rx_packets += stats->rx_packets; |
| 231 | dev_stats->tx_packets += stats->tx_packets; |
| 232 | dev_stats->rx_bytes += stats->rx_bytes; |
| 233 | dev_stats->tx_bytes += stats->tx_bytes; |
| 234 | dev_stats->tx_dropped += stats->tx_dropped; |
| 235 | dev_stats->rx_dropped += stats->rx_dropped; |
| 236 | } |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 237 | |
| 238 | return dev_stats; |
| 239 | } |
| 240 | |
| 241 | static int veth_open(struct net_device *dev) |
| 242 | { |
| 243 | struct veth_priv *priv; |
| 244 | |
| 245 | priv = netdev_priv(dev); |
| 246 | if (priv->peer == NULL) |
| 247 | return -ENOTCONN; |
| 248 | |
| 249 | if (priv->peer->flags & IFF_UP) { |
| 250 | netif_carrier_on(dev); |
| 251 | netif_carrier_on(priv->peer); |
| 252 | } |
| 253 | return 0; |
| 254 | } |
| 255 | |
Eric W. Biederman | 2cf48a1 | 2009-02-25 19:47:29 +0000 | [diff] [blame] | 256 | static int veth_close(struct net_device *dev) |
| 257 | { |
| 258 | struct veth_priv *priv = netdev_priv(dev); |
| 259 | |
| 260 | netif_carrier_off(dev); |
| 261 | netif_carrier_off(priv->peer); |
| 262 | |
| 263 | return 0; |
| 264 | } |
| 265 | |
Eric Biederman | 38d4081 | 2009-03-03 23:36:04 -0800 | [diff] [blame] | 266 | static int is_valid_veth_mtu(int new_mtu) |
| 267 | { |
| 268 | return (new_mtu >= MIN_MTU && new_mtu <= MAX_MTU); |
| 269 | } |
| 270 | |
| 271 | static int veth_change_mtu(struct net_device *dev, int new_mtu) |
| 272 | { |
| 273 | if (!is_valid_veth_mtu(new_mtu)) |
| 274 | return -EINVAL; |
| 275 | dev->mtu = new_mtu; |
| 276 | return 0; |
| 277 | } |
| 278 | |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 279 | static int veth_dev_init(struct net_device *dev) |
| 280 | { |
| 281 | struct veth_net_stats *stats; |
| 282 | struct veth_priv *priv; |
| 283 | |
| 284 | stats = alloc_percpu(struct veth_net_stats); |
| 285 | if (stats == NULL) |
| 286 | return -ENOMEM; |
| 287 | |
| 288 | priv = netdev_priv(dev); |
| 289 | priv->stats = stats; |
| 290 | return 0; |
| 291 | } |
| 292 | |
David S. Miller | 11687a1 | 2009-06-25 02:45:42 -0700 | [diff] [blame] | 293 | static void veth_dev_free(struct net_device *dev) |
| 294 | { |
| 295 | struct veth_priv *priv; |
| 296 | |
| 297 | priv = netdev_priv(dev); |
| 298 | free_percpu(priv->stats); |
| 299 | free_netdev(dev); |
| 300 | } |
| 301 | |
Stephen Hemminger | 4456e7b | 2008-11-19 21:50:10 -0800 | [diff] [blame] | 302 | static const struct net_device_ops veth_netdev_ops = { |
Daniel Lezcano | ee92362 | 2009-02-22 00:04:45 -0800 | [diff] [blame] | 303 | .ndo_init = veth_dev_init, |
| 304 | .ndo_open = veth_open, |
Eric W. Biederman | 2cf48a1 | 2009-02-25 19:47:29 +0000 | [diff] [blame] | 305 | .ndo_stop = veth_close, |
Daniel Lezcano | ee92362 | 2009-02-22 00:04:45 -0800 | [diff] [blame] | 306 | .ndo_start_xmit = veth_xmit, |
Eric Biederman | 38d4081 | 2009-03-03 23:36:04 -0800 | [diff] [blame] | 307 | .ndo_change_mtu = veth_change_mtu, |
Daniel Lezcano | ee92362 | 2009-02-22 00:04:45 -0800 | [diff] [blame] | 308 | .ndo_get_stats = veth_get_stats, |
| 309 | .ndo_set_mac_address = eth_mac_addr, |
Stephen Hemminger | 4456e7b | 2008-11-19 21:50:10 -0800 | [diff] [blame] | 310 | }; |
| 311 | |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 312 | static void veth_setup(struct net_device *dev) |
| 313 | { |
| 314 | ether_setup(dev); |
| 315 | |
Stephen Hemminger | 4456e7b | 2008-11-19 21:50:10 -0800 | [diff] [blame] | 316 | dev->netdev_ops = &veth_netdev_ops; |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 317 | dev->ethtool_ops = &veth_ethtool_ops; |
| 318 | dev->features |= NETIF_F_LLTX; |
David S. Miller | 11687a1 | 2009-06-25 02:45:42 -0700 | [diff] [blame] | 319 | dev->destructor = veth_dev_free; |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 320 | } |
| 321 | |
| 322 | /* |
| 323 | * netlink interface |
| 324 | */ |
| 325 | |
| 326 | static int veth_validate(struct nlattr *tb[], struct nlattr *data[]) |
| 327 | { |
| 328 | if (tb[IFLA_ADDRESS]) { |
| 329 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) |
| 330 | return -EINVAL; |
| 331 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) |
| 332 | return -EADDRNOTAVAIL; |
| 333 | } |
Eric Biederman | 38d4081 | 2009-03-03 23:36:04 -0800 | [diff] [blame] | 334 | if (tb[IFLA_MTU]) { |
| 335 | if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU]))) |
| 336 | return -EINVAL; |
| 337 | } |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 338 | return 0; |
| 339 | } |
| 340 | |
| 341 | static struct rtnl_link_ops veth_link_ops; |
| 342 | |
Eric W. Biederman | 81adee4 | 2009-11-08 00:53:51 -0800 | [diff] [blame] | 343 | static int veth_newlink(struct net *src_net, struct net_device *dev, |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 344 | struct nlattr *tb[], struct nlattr *data[]) |
| 345 | { |
| 346 | int err; |
| 347 | struct net_device *peer; |
| 348 | struct veth_priv *priv; |
| 349 | char ifname[IFNAMSIZ]; |
| 350 | struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; |
Eric W. Biederman | 81adee4 | 2009-11-08 00:53:51 -0800 | [diff] [blame] | 351 | struct net *net; |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 352 | |
| 353 | /* |
| 354 | * create and register peer first |
| 355 | * |
| 356 | * struct ifinfomsg is at the head of VETH_INFO_PEER, but we |
| 357 | * skip it since no info from it is useful yet |
| 358 | */ |
| 359 | |
| 360 | if (data != NULL && data[VETH_INFO_PEER] != NULL) { |
| 361 | struct nlattr *nla_peer; |
| 362 | |
| 363 | nla_peer = data[VETH_INFO_PEER]; |
| 364 | err = nla_parse(peer_tb, IFLA_MAX, |
| 365 | nla_data(nla_peer) + sizeof(struct ifinfomsg), |
| 366 | nla_len(nla_peer) - sizeof(struct ifinfomsg), |
| 367 | ifla_policy); |
| 368 | if (err < 0) |
| 369 | return err; |
| 370 | |
| 371 | err = veth_validate(peer_tb, NULL); |
| 372 | if (err < 0) |
| 373 | return err; |
| 374 | |
| 375 | tbp = peer_tb; |
| 376 | } else |
| 377 | tbp = tb; |
| 378 | |
| 379 | if (tbp[IFLA_IFNAME]) |
| 380 | nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); |
| 381 | else |
| 382 | snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); |
| 383 | |
Eric W. Biederman | 81adee4 | 2009-11-08 00:53:51 -0800 | [diff] [blame] | 384 | net = rtnl_link_get_net(src_net, tbp); |
| 385 | if (IS_ERR(net)) |
| 386 | return PTR_ERR(net); |
| 387 | |
| 388 | peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp); |
| 389 | if (IS_ERR(peer)) { |
| 390 | put_net(net); |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 391 | return PTR_ERR(peer); |
Eric W. Biederman | 81adee4 | 2009-11-08 00:53:51 -0800 | [diff] [blame] | 392 | } |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 393 | |
| 394 | if (tbp[IFLA_ADDRESS] == NULL) |
| 395 | random_ether_addr(peer->dev_addr); |
| 396 | |
| 397 | err = register_netdevice(peer); |
Eric W. Biederman | 81adee4 | 2009-11-08 00:53:51 -0800 | [diff] [blame] | 398 | put_net(net); |
| 399 | net = NULL; |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 400 | if (err < 0) |
| 401 | goto err_register_peer; |
| 402 | |
| 403 | netif_carrier_off(peer); |
| 404 | |
| 405 | /* |
| 406 | * register dev last |
| 407 | * |
| 408 | * note, that since we've registered new device the dev's name |
| 409 | * should be re-allocated |
| 410 | */ |
| 411 | |
| 412 | if (tb[IFLA_ADDRESS] == NULL) |
| 413 | random_ether_addr(dev->dev_addr); |
| 414 | |
| 415 | if (tb[IFLA_IFNAME]) |
| 416 | nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); |
| 417 | else |
| 418 | snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); |
| 419 | |
| 420 | if (strchr(dev->name, '%')) { |
| 421 | err = dev_alloc_name(dev, dev->name); |
| 422 | if (err < 0) |
| 423 | goto err_alloc_name; |
| 424 | } |
| 425 | |
| 426 | err = register_netdevice(dev); |
| 427 | if (err < 0) |
| 428 | goto err_register_dev; |
| 429 | |
| 430 | netif_carrier_off(dev); |
| 431 | |
| 432 | /* |
| 433 | * tie the deviced together |
| 434 | */ |
| 435 | |
| 436 | priv = netdev_priv(dev); |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 437 | priv->peer = peer; |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 438 | |
| 439 | priv = netdev_priv(peer); |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 440 | priv->peer = dev; |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 441 | return 0; |
| 442 | |
| 443 | err_register_dev: |
| 444 | /* nothing to do */ |
| 445 | err_alloc_name: |
| 446 | unregister_netdevice(peer); |
| 447 | return err; |
| 448 | |
| 449 | err_register_peer: |
| 450 | free_netdev(peer); |
| 451 | return err; |
| 452 | } |
| 453 | |
Eric Dumazet | 23289a3 | 2009-10-27 07:06:36 +0000 | [diff] [blame] | 454 | static void veth_dellink(struct net_device *dev, struct list_head *head) |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 455 | { |
| 456 | struct veth_priv *priv; |
| 457 | struct net_device *peer; |
| 458 | |
| 459 | priv = netdev_priv(dev); |
| 460 | peer = priv->peer; |
| 461 | |
Eric Dumazet | 2454053 | 2009-10-30 01:00:27 -0700 | [diff] [blame] | 462 | unregister_netdevice_queue(dev, head); |
| 463 | unregister_netdevice_queue(peer, head); |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 464 | } |
| 465 | |
| 466 | static const struct nla_policy veth_policy[VETH_INFO_MAX + 1]; |
| 467 | |
| 468 | static struct rtnl_link_ops veth_link_ops = { |
| 469 | .kind = DRV_NAME, |
| 470 | .priv_size = sizeof(struct veth_priv), |
| 471 | .setup = veth_setup, |
| 472 | .validate = veth_validate, |
| 473 | .newlink = veth_newlink, |
| 474 | .dellink = veth_dellink, |
| 475 | .policy = veth_policy, |
| 476 | .maxtype = VETH_INFO_MAX, |
| 477 | }; |
| 478 | |
| 479 | /* |
| 480 | * init/fini |
| 481 | */ |
| 482 | |
| 483 | static __init int veth_init(void) |
| 484 | { |
| 485 | return rtnl_link_register(&veth_link_ops); |
| 486 | } |
| 487 | |
| 488 | static __exit void veth_exit(void) |
| 489 | { |
Patrick McHardy | 6836545 | 2008-01-20 17:25:14 -0800 | [diff] [blame] | 490 | rtnl_link_unregister(&veth_link_ops); |
Pavel Emelyanov | e314dbd | 2007-09-25 16:14:46 -0700 | [diff] [blame] | 491 | } |
| 492 | |
| 493 | module_init(veth_init); |
| 494 | module_exit(veth_exit); |
| 495 | |
| 496 | MODULE_DESCRIPTION("Virtual Ethernet Tunnel"); |
| 497 | MODULE_LICENSE("GPL v2"); |
| 498 | MODULE_ALIAS_RTNL_LINK(DRV_NAME); |