1 /* 2 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License as 6 * published by the Free Software Foundation; either version 2 of 7 * the License, or (at your option) any later version. 8 * 9 * The code this is based on carried the following copyright notice: 10 * --- 11 * (C) Copyright 2001-2006 12 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com 13 * Re-worked by Ben Greear <greearb@candelatech.com> 14 * --- 15 */ 16 #include <linux/kernel.h> 17 #include <linux/types.h> 18 #include <linux/module.h> 19 #include <linux/init.h> 20 #include <linux/errno.h> 21 #include <linux/slab.h> 22 #include <linux/string.h> 23 #include <linux/list.h> 24 #include <linux/notifier.h> 25 #include <linux/netdevice.h> 26 #include <linux/etherdevice.h> 27 #include <linux/ethtool.h> 28 #include <linux/if_arp.h> 29 #include <linux/if_link.h> 30 #include <linux/if_macvlan.h> 31 #include <net/rtnetlink.h> 32 33 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE) 34 35 struct macvlan_port { 36 struct net_device *dev; 37 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE]; 38 struct list_head vlans; 39 }; 40 41 struct macvlan_dev { 42 struct net_device *dev; 43 struct list_head list; 44 struct hlist_node hlist; 45 struct macvlan_port *port; 46 struct net_device *lowerdev; 47 }; 48 49 50 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port, 51 const unsigned char *addr) 52 { 53 struct macvlan_dev *vlan; 54 struct hlist_node *n; 55 56 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) { 57 if (!compare_ether_addr(vlan->dev->dev_addr, addr)) 58 return vlan; 59 } 60 return NULL; 61 } 62 63 static void macvlan_broadcast(struct sk_buff *skb, 64 const struct macvlan_port *port) 65 { 66 const struct ethhdr *eth = eth_hdr(skb); 67 const struct macvlan_dev *vlan; 68 struct hlist_node *n; 69 struct net_device *dev; 70 struct sk_buff *nskb; 71 unsigned int i; 72 73 for (i = 0; i < MACVLAN_HASH_SIZE; i++) { 74 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) { 75 dev = vlan->dev; 76 77 nskb = skb_clone(skb, GFP_ATOMIC); 78 if (nskb == NULL) { 79 dev->stats.rx_errors++; 80 dev->stats.rx_dropped++; 81 continue; 82 } 83 84 dev->stats.rx_bytes += skb->len + ETH_HLEN; 85 dev->stats.rx_packets++; 86 dev->stats.multicast++; 87 dev->last_rx = jiffies; 88 89 nskb->dev = dev; 90 if (!compare_ether_addr(eth->h_dest, dev->broadcast)) 91 nskb->pkt_type = PACKET_BROADCAST; 92 else 93 nskb->pkt_type = PACKET_MULTICAST; 94 95 netif_rx(nskb); 96 } 97 } 98 } 99 100 /* called under rcu_read_lock() from netif_receive_skb */ 101 static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb) 102 { 103 const struct ethhdr *eth = eth_hdr(skb); 104 const struct macvlan_port *port; 105 const struct macvlan_dev *vlan; 106 struct net_device *dev; 107 108 port = rcu_dereference(skb->dev->macvlan_port); 109 if (port == NULL) 110 return skb; 111 112 if (is_multicast_ether_addr(eth->h_dest)) { 113 macvlan_broadcast(skb, port); 114 return skb; 115 } 116 117 vlan = macvlan_hash_lookup(port, eth->h_dest); 118 if (vlan == NULL) 119 return skb; 120 121 dev = vlan->dev; 122 if (unlikely(!(dev->flags & IFF_UP))) { 123 kfree_skb(skb); 124 return NULL; 125 } 126 127 skb = skb_share_check(skb, GFP_ATOMIC); 128 if (skb == NULL) { 129 dev->stats.rx_errors++; 130 dev->stats.rx_dropped++; 131 return NULL; 132 } 133 134 dev->stats.rx_bytes += skb->len + ETH_HLEN; 135 dev->stats.rx_packets++; 136 dev->last_rx = jiffies; 137 138 skb->dev = dev; 139 skb->pkt_type = PACKET_HOST; 140 141 netif_rx(skb); 142 return NULL; 143 } 144 145 static int macvlan_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) 146 { 147 const struct macvlan_dev *vlan = netdev_priv(dev); 148 unsigned int len = skb->len; 149 int ret; 150 151 skb->dev = vlan->lowerdev; 152 ret = dev_queue_xmit(skb); 153 154 if (likely(ret == NET_XMIT_SUCCESS)) { 155 dev->stats.tx_packets++; 156 dev->stats.tx_bytes += len; 157 } else { 158 dev->stats.tx_errors++; 159 dev->stats.tx_aborted_errors++; 160 } 161 return NETDEV_TX_OK; 162 } 163 164 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 165 unsigned short type, const void *daddr, 166 const void *saddr, unsigned len) 167 { 168 const struct macvlan_dev *vlan = netdev_priv(dev); 169 struct net_device *lowerdev = vlan->lowerdev; 170 171 return dev_hard_header(skb, lowerdev, type, daddr, 172 saddr ? : dev->dev_addr, len); 173 } 174 175 static const struct header_ops macvlan_hard_header_ops = { 176 .create = macvlan_hard_header, 177 .rebuild = eth_rebuild_header, 178 .parse = eth_header_parse, 179 .cache = eth_header_cache, 180 .cache_update = eth_header_cache_update, 181 }; 182 183 static int macvlan_open(struct net_device *dev) 184 { 185 struct macvlan_dev *vlan = netdev_priv(dev); 186 struct macvlan_port *port = vlan->port; 187 struct net_device *lowerdev = vlan->lowerdev; 188 int err; 189 190 err = dev_unicast_add(lowerdev, dev->dev_addr, ETH_ALEN); 191 if (err < 0) 192 return err; 193 if (dev->flags & IFF_ALLMULTI) 194 dev_set_allmulti(lowerdev, 1); 195 196 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[dev->dev_addr[5]]); 197 return 0; 198 } 199 200 static int macvlan_stop(struct net_device *dev) 201 { 202 struct macvlan_dev *vlan = netdev_priv(dev); 203 struct net_device *lowerdev = vlan->lowerdev; 204 205 dev_mc_unsync(lowerdev, dev); 206 if (dev->flags & IFF_ALLMULTI) 207 dev_set_allmulti(lowerdev, -1); 208 209 dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN); 210 211 hlist_del_rcu(&vlan->hlist); 212 synchronize_rcu(); 213 return 0; 214 } 215 216 static int macvlan_set_mac_address(struct net_device *dev, void *p) 217 { 218 struct macvlan_dev *vlan = netdev_priv(dev); 219 struct net_device *lowerdev = vlan->lowerdev; 220 struct sockaddr *addr = p; 221 int err; 222 223 if (!is_valid_ether_addr(addr->sa_data)) 224 return -EADDRNOTAVAIL; 225 226 if (!(dev->flags & IFF_UP)) 227 goto out; 228 229 err = dev_unicast_add(lowerdev, addr->sa_data, ETH_ALEN); 230 if (err < 0) 231 return err; 232 dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN); 233 234 out: 235 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 236 return 0; 237 } 238 239 static void macvlan_change_rx_flags(struct net_device *dev, int change) 240 { 241 struct macvlan_dev *vlan = netdev_priv(dev); 242 struct net_device *lowerdev = vlan->lowerdev; 243 244 if (change & IFF_ALLMULTI) 245 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 246 } 247 248 static void macvlan_set_multicast_list(struct net_device *dev) 249 { 250 struct macvlan_dev *vlan = netdev_priv(dev); 251 252 dev_mc_sync(vlan->lowerdev, dev); 253 } 254 255 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 256 { 257 struct macvlan_dev *vlan = netdev_priv(dev); 258 259 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 260 return -EINVAL; 261 dev->mtu = new_mtu; 262 return 0; 263 } 264 265 /* 266 * macvlan network devices have devices nesting below it and are a special 267 * "super class" of normal network devices; split their locks off into a 268 * separate class since they always nest. 269 */ 270 static struct lock_class_key macvlan_netdev_xmit_lock_key; 271 272 #define MACVLAN_FEATURES \ 273 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 274 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 275 NETIF_F_TSO_ECN | NETIF_F_TSO6) 276 277 #define MACVLAN_STATE_MASK \ 278 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 279 280 static int macvlan_init(struct net_device *dev) 281 { 282 struct macvlan_dev *vlan = netdev_priv(dev); 283 const struct net_device *lowerdev = vlan->lowerdev; 284 285 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 286 (lowerdev->state & MACVLAN_STATE_MASK); 287 dev->features = lowerdev->features & MACVLAN_FEATURES; 288 dev->iflink = lowerdev->ifindex; 289 290 lockdep_set_class(&dev->_xmit_lock, &macvlan_netdev_xmit_lock_key); 291 return 0; 292 } 293 294 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 295 struct ethtool_drvinfo *drvinfo) 296 { 297 snprintf(drvinfo->driver, 32, "macvlan"); 298 snprintf(drvinfo->version, 32, "0.1"); 299 } 300 301 static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev) 302 { 303 const struct macvlan_dev *vlan = netdev_priv(dev); 304 struct net_device *lowerdev = vlan->lowerdev; 305 306 if (lowerdev->ethtool_ops->get_rx_csum == NULL) 307 return 0; 308 return lowerdev->ethtool_ops->get_rx_csum(lowerdev); 309 } 310 311 static const struct ethtool_ops macvlan_ethtool_ops = { 312 .get_link = ethtool_op_get_link, 313 .get_rx_csum = macvlan_ethtool_get_rx_csum, 314 .get_drvinfo = macvlan_ethtool_get_drvinfo, 315 }; 316 317 static void macvlan_setup(struct net_device *dev) 318 { 319 ether_setup(dev); 320 321 dev->init = macvlan_init; 322 dev->open = macvlan_open; 323 dev->stop = macvlan_stop; 324 dev->change_mtu = macvlan_change_mtu; 325 dev->change_rx_flags = macvlan_change_rx_flags; 326 dev->set_mac_address = macvlan_set_mac_address; 327 dev->set_multicast_list = macvlan_set_multicast_list; 328 dev->hard_start_xmit = macvlan_hard_start_xmit; 329 dev->destructor = free_netdev; 330 dev->header_ops = &macvlan_hard_header_ops, 331 dev->ethtool_ops = &macvlan_ethtool_ops; 332 dev->tx_queue_len = 0; 333 } 334 335 static int macvlan_port_create(struct net_device *dev) 336 { 337 struct macvlan_port *port; 338 unsigned int i; 339 340 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 341 return -EINVAL; 342 343 port = kzalloc(sizeof(*port), GFP_KERNEL); 344 if (port == NULL) 345 return -ENOMEM; 346 347 port->dev = dev; 348 INIT_LIST_HEAD(&port->vlans); 349 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 350 INIT_HLIST_HEAD(&port->vlan_hash[i]); 351 rcu_assign_pointer(dev->macvlan_port, port); 352 return 0; 353 } 354 355 static void macvlan_port_destroy(struct net_device *dev) 356 { 357 struct macvlan_port *port = dev->macvlan_port; 358 359 rcu_assign_pointer(dev->macvlan_port, NULL); 360 synchronize_rcu(); 361 kfree(port); 362 } 363 364 static void macvlan_transfer_operstate(struct net_device *dev) 365 { 366 struct macvlan_dev *vlan = netdev_priv(dev); 367 const struct net_device *lowerdev = vlan->lowerdev; 368 369 if (lowerdev->operstate == IF_OPER_DORMANT) 370 netif_dormant_on(dev); 371 else 372 netif_dormant_off(dev); 373 374 if (netif_carrier_ok(lowerdev)) { 375 if (!netif_carrier_ok(dev)) 376 netif_carrier_on(dev); 377 } else { 378 if (netif_carrier_ok(dev)) 379 netif_carrier_off(dev); 380 } 381 } 382 383 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 384 { 385 if (tb[IFLA_ADDRESS]) { 386 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 387 return -EINVAL; 388 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 389 return -EADDRNOTAVAIL; 390 } 391 return 0; 392 } 393 394 static int macvlan_newlink(struct net_device *dev, 395 struct nlattr *tb[], struct nlattr *data[]) 396 { 397 struct macvlan_dev *vlan = netdev_priv(dev); 398 struct macvlan_port *port; 399 struct net_device *lowerdev; 400 int err; 401 402 if (!tb[IFLA_LINK]) 403 return -EINVAL; 404 405 lowerdev = __dev_get_by_index(dev->nd_net, nla_get_u32(tb[IFLA_LINK])); 406 if (lowerdev == NULL) 407 return -ENODEV; 408 409 /* Don't allow macvlans on top of other macvlans - its not really 410 * wrong, but lockdep can't handle it and its not useful for anything 411 * you couldn't do directly on top of the real device. 412 */ 413 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) 414 return -ENODEV; 415 416 if (!tb[IFLA_MTU]) 417 dev->mtu = lowerdev->mtu; 418 else if (dev->mtu > lowerdev->mtu) 419 return -EINVAL; 420 421 if (!tb[IFLA_ADDRESS]) 422 random_ether_addr(dev->dev_addr); 423 424 if (lowerdev->macvlan_port == NULL) { 425 err = macvlan_port_create(lowerdev); 426 if (err < 0) 427 return err; 428 } 429 port = lowerdev->macvlan_port; 430 431 vlan->lowerdev = lowerdev; 432 vlan->dev = dev; 433 vlan->port = port; 434 435 err = register_netdevice(dev); 436 if (err < 0) 437 return err; 438 439 list_add_tail(&vlan->list, &port->vlans); 440 macvlan_transfer_operstate(dev); 441 return 0; 442 } 443 444 static void macvlan_dellink(struct net_device *dev) 445 { 446 struct macvlan_dev *vlan = netdev_priv(dev); 447 struct macvlan_port *port = vlan->port; 448 449 list_del(&vlan->list); 450 unregister_netdevice(dev); 451 452 if (list_empty(&port->vlans)) 453 macvlan_port_destroy(dev); 454 } 455 456 static struct rtnl_link_ops macvlan_link_ops __read_mostly = { 457 .kind = "macvlan", 458 .priv_size = sizeof(struct macvlan_dev), 459 .setup = macvlan_setup, 460 .validate = macvlan_validate, 461 .newlink = macvlan_newlink, 462 .dellink = macvlan_dellink, 463 }; 464 465 static int macvlan_device_event(struct notifier_block *unused, 466 unsigned long event, void *ptr) 467 { 468 struct net_device *dev = ptr; 469 struct macvlan_dev *vlan, *next; 470 struct macvlan_port *port; 471 472 port = dev->macvlan_port; 473 if (port == NULL) 474 return NOTIFY_DONE; 475 476 switch (event) { 477 case NETDEV_CHANGE: 478 list_for_each_entry(vlan, &port->vlans, list) 479 macvlan_transfer_operstate(vlan->dev); 480 break; 481 case NETDEV_FEAT_CHANGE: 482 list_for_each_entry(vlan, &port->vlans, list) { 483 vlan->dev->features = dev->features & MACVLAN_FEATURES; 484 netdev_features_change(vlan->dev); 485 } 486 break; 487 case NETDEV_UNREGISTER: 488 list_for_each_entry_safe(vlan, next, &port->vlans, list) 489 macvlan_dellink(vlan->dev); 490 break; 491 } 492 return NOTIFY_DONE; 493 } 494 495 static struct notifier_block macvlan_notifier_block __read_mostly = { 496 .notifier_call = macvlan_device_event, 497 }; 498 499 static int __init macvlan_init_module(void) 500 { 501 int err; 502 503 register_netdevice_notifier(&macvlan_notifier_block); 504 macvlan_handle_frame_hook = macvlan_handle_frame; 505 506 err = rtnl_link_register(&macvlan_link_ops); 507 if (err < 0) 508 goto err1; 509 return 0; 510 err1: 511 macvlan_handle_frame_hook = NULL; 512 unregister_netdevice_notifier(&macvlan_notifier_block); 513 return err; 514 } 515 516 static void __exit macvlan_cleanup_module(void) 517 { 518 rtnl_link_unregister(&macvlan_link_ops); 519 macvlan_handle_frame_hook = NULL; 520 unregister_netdevice_notifier(&macvlan_notifier_block); 521 } 522 523 module_init(macvlan_init_module); 524 module_exit(macvlan_cleanup_module); 525 526 MODULE_LICENSE("GPL"); 527 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 528 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 529 MODULE_ALIAS_RTNL_LINK("macvlan"); 530