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 if (unlikely(!(dev->flags & IFF_UP))) 77 continue; 78 79 nskb = skb_clone(skb, GFP_ATOMIC); 80 if (nskb == NULL) { 81 dev->stats.rx_errors++; 82 dev->stats.rx_dropped++; 83 continue; 84 } 85 86 dev->stats.rx_bytes += skb->len + ETH_HLEN; 87 dev->stats.rx_packets++; 88 dev->stats.multicast++; 89 dev->last_rx = jiffies; 90 91 nskb->dev = dev; 92 if (!compare_ether_addr(eth->h_dest, dev->broadcast)) 93 nskb->pkt_type = PACKET_BROADCAST; 94 else 95 nskb->pkt_type = PACKET_MULTICAST; 96 97 netif_rx(nskb); 98 } 99 } 100 } 101 102 /* called under rcu_read_lock() from netif_receive_skb */ 103 static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb) 104 { 105 const struct ethhdr *eth = eth_hdr(skb); 106 const struct macvlan_port *port; 107 const struct macvlan_dev *vlan; 108 struct net_device *dev; 109 110 port = rcu_dereference(skb->dev->macvlan_port); 111 if (port == NULL) 112 return skb; 113 114 if (is_multicast_ether_addr(eth->h_dest)) { 115 macvlan_broadcast(skb, port); 116 return skb; 117 } 118 119 vlan = macvlan_hash_lookup(port, eth->h_dest); 120 if (vlan == NULL) 121 return skb; 122 123 dev = vlan->dev; 124 if (unlikely(!(dev->flags & IFF_UP))) { 125 kfree_skb(skb); 126 return NULL; 127 } 128 129 skb = skb_share_check(skb, GFP_ATOMIC); 130 if (skb == NULL) { 131 dev->stats.rx_errors++; 132 dev->stats.rx_dropped++; 133 return NULL; 134 } 135 136 dev->stats.rx_bytes += skb->len + ETH_HLEN; 137 dev->stats.rx_packets++; 138 dev->last_rx = jiffies; 139 140 skb->dev = dev; 141 skb->pkt_type = PACKET_HOST; 142 143 netif_rx(skb); 144 return NULL; 145 } 146 147 static int macvlan_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) 148 { 149 const struct macvlan_dev *vlan = netdev_priv(dev); 150 unsigned int len = skb->len; 151 int ret; 152 153 skb->dev = vlan->lowerdev; 154 ret = dev_queue_xmit(skb); 155 156 if (likely(ret == NET_XMIT_SUCCESS)) { 157 dev->stats.tx_packets++; 158 dev->stats.tx_bytes += len; 159 } else { 160 dev->stats.tx_errors++; 161 dev->stats.tx_aborted_errors++; 162 } 163 return NETDEV_TX_OK; 164 } 165 166 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev, 167 unsigned short type, const void *daddr, 168 const void *saddr, unsigned len) 169 { 170 const struct macvlan_dev *vlan = netdev_priv(dev); 171 struct net_device *lowerdev = vlan->lowerdev; 172 173 return dev_hard_header(skb, lowerdev, type, daddr, 174 saddr ? : dev->dev_addr, len); 175 } 176 177 static const struct header_ops macvlan_hard_header_ops = { 178 .create = macvlan_hard_header, 179 .rebuild = eth_rebuild_header, 180 .parse = eth_header_parse, 181 .cache = eth_header_cache, 182 .cache_update = eth_header_cache_update, 183 }; 184 185 static int macvlan_open(struct net_device *dev) 186 { 187 struct macvlan_dev *vlan = netdev_priv(dev); 188 struct macvlan_port *port = vlan->port; 189 struct net_device *lowerdev = vlan->lowerdev; 190 int err; 191 192 err = dev_unicast_add(lowerdev, dev->dev_addr, ETH_ALEN); 193 if (err < 0) 194 return err; 195 if (dev->flags & IFF_ALLMULTI) 196 dev_set_allmulti(lowerdev, 1); 197 198 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[dev->dev_addr[5]]); 199 return 0; 200 } 201 202 static int macvlan_stop(struct net_device *dev) 203 { 204 struct macvlan_dev *vlan = netdev_priv(dev); 205 struct net_device *lowerdev = vlan->lowerdev; 206 207 dev_mc_unsync(lowerdev, dev); 208 if (dev->flags & IFF_ALLMULTI) 209 dev_set_allmulti(lowerdev, -1); 210 211 dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN); 212 213 hlist_del_rcu(&vlan->hlist); 214 synchronize_rcu(); 215 return 0; 216 } 217 218 static void macvlan_change_rx_flags(struct net_device *dev, int change) 219 { 220 struct macvlan_dev *vlan = netdev_priv(dev); 221 struct net_device *lowerdev = vlan->lowerdev; 222 223 if (change & IFF_ALLMULTI) 224 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 225 } 226 227 static void macvlan_set_multicast_list(struct net_device *dev) 228 { 229 struct macvlan_dev *vlan = netdev_priv(dev); 230 231 dev_mc_sync(vlan->lowerdev, dev); 232 } 233 234 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 235 { 236 struct macvlan_dev *vlan = netdev_priv(dev); 237 238 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 239 return -EINVAL; 240 dev->mtu = new_mtu; 241 return 0; 242 } 243 244 /* 245 * macvlan network devices have devices nesting below it and are a special 246 * "super class" of normal network devices; split their locks off into a 247 * separate class since they always nest. 248 */ 249 static struct lock_class_key macvlan_netdev_xmit_lock_key; 250 251 #define MACVLAN_FEATURES \ 252 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 253 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 254 NETIF_F_TSO_ECN | NETIF_F_TSO6) 255 256 #define MACVLAN_STATE_MASK \ 257 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 258 259 static int macvlan_init(struct net_device *dev) 260 { 261 struct macvlan_dev *vlan = netdev_priv(dev); 262 const struct net_device *lowerdev = vlan->lowerdev; 263 264 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 265 (lowerdev->state & MACVLAN_STATE_MASK); 266 dev->features = lowerdev->features & MACVLAN_FEATURES; 267 dev->iflink = lowerdev->ifindex; 268 269 lockdep_set_class(&dev->_xmit_lock, &macvlan_netdev_xmit_lock_key); 270 return 0; 271 } 272 273 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 274 struct ethtool_drvinfo *drvinfo) 275 { 276 snprintf(drvinfo->driver, 32, "macvlan"); 277 snprintf(drvinfo->version, 32, "0.1"); 278 } 279 280 static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev) 281 { 282 const struct macvlan_dev *vlan = netdev_priv(dev); 283 struct net_device *lowerdev = vlan->lowerdev; 284 285 if (lowerdev->ethtool_ops->get_rx_csum == NULL) 286 return 0; 287 return lowerdev->ethtool_ops->get_rx_csum(lowerdev); 288 } 289 290 static const struct ethtool_ops macvlan_ethtool_ops = { 291 .get_link = ethtool_op_get_link, 292 .get_rx_csum = macvlan_ethtool_get_rx_csum, 293 .get_drvinfo = macvlan_ethtool_get_drvinfo, 294 }; 295 296 static void macvlan_setup(struct net_device *dev) 297 { 298 ether_setup(dev); 299 300 dev->init = macvlan_init; 301 dev->open = macvlan_open; 302 dev->stop = macvlan_stop; 303 dev->change_mtu = macvlan_change_mtu; 304 dev->change_rx_flags = macvlan_change_rx_flags; 305 dev->set_multicast_list = macvlan_set_multicast_list; 306 dev->hard_start_xmit = macvlan_hard_start_xmit; 307 dev->destructor = free_netdev; 308 dev->header_ops = &macvlan_hard_header_ops, 309 dev->ethtool_ops = &macvlan_ethtool_ops; 310 dev->tx_queue_len = 0; 311 } 312 313 static int macvlan_port_create(struct net_device *dev) 314 { 315 struct macvlan_port *port; 316 unsigned int i; 317 318 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 319 return -EINVAL; 320 321 port = kzalloc(sizeof(*port), GFP_KERNEL); 322 if (port == NULL) 323 return -ENOMEM; 324 325 port->dev = dev; 326 INIT_LIST_HEAD(&port->vlans); 327 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 328 INIT_HLIST_HEAD(&port->vlan_hash[i]); 329 rcu_assign_pointer(dev->macvlan_port, port); 330 return 0; 331 } 332 333 static void macvlan_port_destroy(struct net_device *dev) 334 { 335 struct macvlan_port *port = dev->macvlan_port; 336 337 rcu_assign_pointer(dev->macvlan_port, NULL); 338 synchronize_rcu(); 339 kfree(port); 340 } 341 342 static void macvlan_transfer_operstate(struct net_device *dev) 343 { 344 struct macvlan_dev *vlan = netdev_priv(dev); 345 const struct net_device *lowerdev = vlan->lowerdev; 346 347 if (lowerdev->operstate == IF_OPER_DORMANT) 348 netif_dormant_on(dev); 349 else 350 netif_dormant_off(dev); 351 352 if (netif_carrier_ok(lowerdev)) { 353 if (!netif_carrier_ok(dev)) 354 netif_carrier_on(dev); 355 } else { 356 if (netif_carrier_ok(lowerdev)) 357 netif_carrier_off(dev); 358 } 359 } 360 361 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 362 { 363 if (tb[IFLA_ADDRESS]) { 364 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 365 return -EINVAL; 366 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 367 return -EADDRNOTAVAIL; 368 } 369 return 0; 370 } 371 372 static int macvlan_newlink(struct net_device *dev, 373 struct nlattr *tb[], struct nlattr *data[]) 374 { 375 struct macvlan_dev *vlan = netdev_priv(dev); 376 struct macvlan_port *port; 377 struct net_device *lowerdev; 378 int err; 379 380 if (!tb[IFLA_LINK]) 381 return -EINVAL; 382 383 lowerdev = __dev_get_by_index(dev->nd_net, nla_get_u32(tb[IFLA_LINK])); 384 if (lowerdev == NULL) 385 return -ENODEV; 386 387 if (!tb[IFLA_MTU]) 388 dev->mtu = lowerdev->mtu; 389 else if (dev->mtu > lowerdev->mtu) 390 return -EINVAL; 391 392 if (!tb[IFLA_ADDRESS]) 393 random_ether_addr(dev->dev_addr); 394 395 if (lowerdev->macvlan_port == NULL) { 396 err = macvlan_port_create(lowerdev); 397 if (err < 0) 398 return err; 399 } 400 port = lowerdev->macvlan_port; 401 402 vlan->lowerdev = lowerdev; 403 vlan->dev = dev; 404 vlan->port = port; 405 406 err = register_netdevice(dev); 407 if (err < 0) 408 return err; 409 410 list_add_tail(&vlan->list, &port->vlans); 411 macvlan_transfer_operstate(dev); 412 return 0; 413 } 414 415 static void macvlan_dellink(struct net_device *dev) 416 { 417 struct macvlan_dev *vlan = netdev_priv(dev); 418 struct macvlan_port *port = vlan->port; 419 420 list_del(&vlan->list); 421 unregister_netdevice(dev); 422 423 if (list_empty(&port->vlans)) 424 macvlan_port_destroy(dev); 425 } 426 427 static struct rtnl_link_ops macvlan_link_ops __read_mostly = { 428 .kind = "macvlan", 429 .priv_size = sizeof(struct macvlan_dev), 430 .setup = macvlan_setup, 431 .validate = macvlan_validate, 432 .newlink = macvlan_newlink, 433 .dellink = macvlan_dellink, 434 }; 435 436 static int macvlan_device_event(struct notifier_block *unused, 437 unsigned long event, void *ptr) 438 { 439 struct net_device *dev = ptr; 440 struct macvlan_dev *vlan, *next; 441 struct macvlan_port *port; 442 443 port = dev->macvlan_port; 444 if (port == NULL) 445 return NOTIFY_DONE; 446 447 switch (event) { 448 case NETDEV_CHANGE: 449 list_for_each_entry(vlan, &port->vlans, list) 450 macvlan_transfer_operstate(vlan->dev); 451 break; 452 case NETDEV_FEAT_CHANGE: 453 list_for_each_entry(vlan, &port->vlans, list) { 454 vlan->dev->features = dev->features & MACVLAN_FEATURES; 455 netdev_features_change(vlan->dev); 456 } 457 break; 458 case NETDEV_UNREGISTER: 459 list_for_each_entry_safe(vlan, next, &port->vlans, list) 460 macvlan_dellink(vlan->dev); 461 break; 462 } 463 return NOTIFY_DONE; 464 } 465 466 static struct notifier_block macvlan_notifier_block __read_mostly = { 467 .notifier_call = macvlan_device_event, 468 }; 469 470 static int __init macvlan_init_module(void) 471 { 472 int err; 473 474 register_netdevice_notifier(&macvlan_notifier_block); 475 macvlan_handle_frame_hook = macvlan_handle_frame; 476 477 err = rtnl_link_register(&macvlan_link_ops); 478 if (err < 0) 479 goto err1; 480 return 0; 481 err1: 482 macvlan_handle_frame_hook = macvlan_handle_frame; 483 unregister_netdevice_notifier(&macvlan_notifier_block); 484 return err; 485 } 486 487 static void __exit macvlan_cleanup_module(void) 488 { 489 rtnl_link_unregister(&macvlan_link_ops); 490 macvlan_handle_frame_hook = NULL; 491 unregister_netdevice_notifier(&macvlan_notifier_block); 492 } 493 494 module_init(macvlan_init_module); 495 module_exit(macvlan_cleanup_module); 496 497 MODULE_LICENSE("GPL"); 498 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 499 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 500 MODULE_ALIAS_RTNL_LINK("macvlan"); 501