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 .rebuild = eth_rebuild_header, 182 .cache = eth_header_cache, 183 .cache_update = eth_header_cache_update, 184 }; 185 186 static int macvlan_open(struct net_device *dev) 187 { 188 struct macvlan_dev *vlan = netdev_priv(dev); 189 struct macvlan_port *port = vlan->port; 190 struct net_device *lowerdev = vlan->lowerdev; 191 int err; 192 193 err = dev_unicast_add(lowerdev, dev->dev_addr, ETH_ALEN); 194 if (err < 0) 195 return err; 196 if (dev->flags & IFF_ALLMULTI) 197 dev_set_allmulti(lowerdev, 1); 198 199 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[dev->dev_addr[5]]); 200 return 0; 201 } 202 203 static int macvlan_stop(struct net_device *dev) 204 { 205 struct macvlan_dev *vlan = netdev_priv(dev); 206 struct net_device *lowerdev = vlan->lowerdev; 207 208 dev_mc_unsync(lowerdev, dev); 209 if (dev->flags & IFF_ALLMULTI) 210 dev_set_allmulti(lowerdev, -1); 211 212 dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN); 213 214 hlist_del_rcu(&vlan->hlist); 215 synchronize_rcu(); 216 return 0; 217 } 218 219 static void macvlan_change_rx_flags(struct net_device *dev, int change) 220 { 221 struct macvlan_dev *vlan = netdev_priv(dev); 222 struct net_device *lowerdev = vlan->lowerdev; 223 224 if (change & IFF_ALLMULTI) 225 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 226 } 227 228 static void macvlan_set_multicast_list(struct net_device *dev) 229 { 230 struct macvlan_dev *vlan = netdev_priv(dev); 231 232 dev_mc_sync(vlan->lowerdev, dev); 233 } 234 235 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 236 { 237 struct macvlan_dev *vlan = netdev_priv(dev); 238 239 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 240 return -EINVAL; 241 dev->mtu = new_mtu; 242 return 0; 243 } 244 245 /* 246 * macvlan network devices have devices nesting below it and are a special 247 * "super class" of normal network devices; split their locks off into a 248 * separate class since they always nest. 249 */ 250 static struct lock_class_key macvlan_netdev_xmit_lock_key; 251 252 #define MACVLAN_FEATURES \ 253 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 254 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 255 NETIF_F_TSO_ECN | NETIF_F_TSO6) 256 257 #define MACVLAN_STATE_MASK \ 258 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 259 260 static int macvlan_init(struct net_device *dev) 261 { 262 struct macvlan_dev *vlan = netdev_priv(dev); 263 const struct net_device *lowerdev = vlan->lowerdev; 264 265 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 266 (lowerdev->state & MACVLAN_STATE_MASK); 267 dev->features = lowerdev->features & MACVLAN_FEATURES; 268 dev->iflink = lowerdev->ifindex; 269 270 lockdep_set_class(&dev->_xmit_lock, &macvlan_netdev_xmit_lock_key); 271 return 0; 272 } 273 274 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 275 struct ethtool_drvinfo *drvinfo) 276 { 277 snprintf(drvinfo->driver, 32, "macvlan"); 278 snprintf(drvinfo->version, 32, "0.1"); 279 } 280 281 static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev) 282 { 283 const struct macvlan_dev *vlan = netdev_priv(dev); 284 struct net_device *lowerdev = vlan->lowerdev; 285 286 if (lowerdev->ethtool_ops->get_rx_csum == NULL) 287 return 0; 288 return lowerdev->ethtool_ops->get_rx_csum(lowerdev); 289 } 290 291 static const struct ethtool_ops macvlan_ethtool_ops = { 292 .get_link = ethtool_op_get_link, 293 .get_rx_csum = macvlan_ethtool_get_rx_csum, 294 .get_drvinfo = macvlan_ethtool_get_drvinfo, 295 }; 296 297 static void macvlan_setup(struct net_device *dev) 298 { 299 ether_setup(dev); 300 301 dev->init = macvlan_init; 302 dev->open = macvlan_open; 303 dev->stop = macvlan_stop; 304 dev->change_mtu = macvlan_change_mtu; 305 dev->change_rx_flags = macvlan_change_rx_flags; 306 dev->set_multicast_list = macvlan_set_multicast_list; 307 dev->hard_start_xmit = macvlan_hard_start_xmit; 308 dev->destructor = free_netdev; 309 dev->header_ops = &macvlan_hard_header_ops, 310 dev->ethtool_ops = &macvlan_ethtool_ops; 311 dev->tx_queue_len = 0; 312 } 313 314 static int macvlan_port_create(struct net_device *dev) 315 { 316 struct macvlan_port *port; 317 unsigned int i; 318 319 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 320 return -EINVAL; 321 322 port = kzalloc(sizeof(*port), GFP_KERNEL); 323 if (port == NULL) 324 return -ENOMEM; 325 326 port->dev = dev; 327 INIT_LIST_HEAD(&port->vlans); 328 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 329 INIT_HLIST_HEAD(&port->vlan_hash[i]); 330 rcu_assign_pointer(dev->macvlan_port, port); 331 return 0; 332 } 333 334 static void macvlan_port_destroy(struct net_device *dev) 335 { 336 struct macvlan_port *port = dev->macvlan_port; 337 338 rcu_assign_pointer(dev->macvlan_port, NULL); 339 synchronize_rcu(); 340 kfree(port); 341 } 342 343 static void macvlan_transfer_operstate(struct net_device *dev) 344 { 345 struct macvlan_dev *vlan = netdev_priv(dev); 346 const struct net_device *lowerdev = vlan->lowerdev; 347 348 if (lowerdev->operstate == IF_OPER_DORMANT) 349 netif_dormant_on(dev); 350 else 351 netif_dormant_off(dev); 352 353 if (netif_carrier_ok(lowerdev)) { 354 if (!netif_carrier_ok(dev)) 355 netif_carrier_on(dev); 356 } else { 357 if (netif_carrier_ok(lowerdev)) 358 netif_carrier_off(dev); 359 } 360 } 361 362 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 363 { 364 if (tb[IFLA_ADDRESS]) { 365 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 366 return -EINVAL; 367 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 368 return -EADDRNOTAVAIL; 369 } 370 return 0; 371 } 372 373 static int macvlan_newlink(struct net_device *dev, 374 struct nlattr *tb[], struct nlattr *data[]) 375 { 376 struct macvlan_dev *vlan = netdev_priv(dev); 377 struct macvlan_port *port; 378 struct net_device *lowerdev; 379 int err; 380 381 if (!tb[IFLA_LINK]) 382 return -EINVAL; 383 384 lowerdev = __dev_get_by_index(dev->nd_net, nla_get_u32(tb[IFLA_LINK])); 385 if (lowerdev == NULL) 386 return -ENODEV; 387 388 if (!tb[IFLA_MTU]) 389 dev->mtu = lowerdev->mtu; 390 else if (dev->mtu > lowerdev->mtu) 391 return -EINVAL; 392 393 if (!tb[IFLA_ADDRESS]) 394 random_ether_addr(dev->dev_addr); 395 396 if (lowerdev->macvlan_port == NULL) { 397 err = macvlan_port_create(lowerdev); 398 if (err < 0) 399 return err; 400 } 401 port = lowerdev->macvlan_port; 402 403 vlan->lowerdev = lowerdev; 404 vlan->dev = dev; 405 vlan->port = port; 406 407 err = register_netdevice(dev); 408 if (err < 0) 409 return err; 410 411 list_add_tail(&vlan->list, &port->vlans); 412 macvlan_transfer_operstate(dev); 413 return 0; 414 } 415 416 static void macvlan_dellink(struct net_device *dev) 417 { 418 struct macvlan_dev *vlan = netdev_priv(dev); 419 struct macvlan_port *port = vlan->port; 420 421 list_del(&vlan->list); 422 unregister_netdevice(dev); 423 424 if (list_empty(&port->vlans)) 425 macvlan_port_destroy(dev); 426 } 427 428 static struct rtnl_link_ops macvlan_link_ops __read_mostly = { 429 .kind = "macvlan", 430 .priv_size = sizeof(struct macvlan_dev), 431 .setup = macvlan_setup, 432 .validate = macvlan_validate, 433 .newlink = macvlan_newlink, 434 .dellink = macvlan_dellink, 435 }; 436 437 static int macvlan_device_event(struct notifier_block *unused, 438 unsigned long event, void *ptr) 439 { 440 struct net_device *dev = ptr; 441 struct macvlan_dev *vlan, *next; 442 struct macvlan_port *port; 443 444 port = dev->macvlan_port; 445 if (port == NULL) 446 return NOTIFY_DONE; 447 448 switch (event) { 449 case NETDEV_CHANGE: 450 list_for_each_entry(vlan, &port->vlans, list) 451 macvlan_transfer_operstate(vlan->dev); 452 break; 453 case NETDEV_FEAT_CHANGE: 454 list_for_each_entry(vlan, &port->vlans, list) { 455 vlan->dev->features = dev->features & MACVLAN_FEATURES; 456 netdev_features_change(vlan->dev); 457 } 458 break; 459 case NETDEV_UNREGISTER: 460 list_for_each_entry_safe(vlan, next, &port->vlans, list) 461 macvlan_dellink(vlan->dev); 462 break; 463 } 464 return NOTIFY_DONE; 465 } 466 467 static struct notifier_block macvlan_notifier_block __read_mostly = { 468 .notifier_call = macvlan_device_event, 469 }; 470 471 static int __init macvlan_init_module(void) 472 { 473 int err; 474 475 register_netdevice_notifier(&macvlan_notifier_block); 476 macvlan_handle_frame_hook = macvlan_handle_frame; 477 478 err = rtnl_link_register(&macvlan_link_ops); 479 if (err < 0) 480 goto err1; 481 return 0; 482 err1: 483 macvlan_handle_frame_hook = macvlan_handle_frame; 484 unregister_netdevice_notifier(&macvlan_notifier_block); 485 return err; 486 } 487 488 static void __exit macvlan_cleanup_module(void) 489 { 490 rtnl_link_unregister(&macvlan_link_ops); 491 macvlan_handle_frame_hook = NULL; 492 unregister_netdevice_notifier(&macvlan_notifier_block); 493 } 494 495 module_init(macvlan_init_module); 496 module_exit(macvlan_cleanup_module); 497 498 MODULE_LICENSE("GPL"); 499 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 500 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 501 MODULE_ALIAS_RTNL_LINK("macvlan"); 502