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, void *daddr, void *saddr, 168 unsigned len) 169 { 170 const struct macvlan_dev *vlan = netdev_priv(dev); 171 struct net_device *lowerdev = vlan->lowerdev; 172 173 return lowerdev->hard_header(skb, lowerdev, type, daddr, 174 saddr ? : dev->dev_addr, len); 175 } 176 177 static int macvlan_open(struct net_device *dev) 178 { 179 struct macvlan_dev *vlan = netdev_priv(dev); 180 struct macvlan_port *port = vlan->port; 181 struct net_device *lowerdev = vlan->lowerdev; 182 int err; 183 184 err = dev_unicast_add(lowerdev, dev->dev_addr, ETH_ALEN); 185 if (err < 0) 186 return err; 187 if (dev->flags & IFF_ALLMULTI) 188 dev_set_allmulti(lowerdev, 1); 189 190 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[dev->dev_addr[5]]); 191 return 0; 192 } 193 194 static int macvlan_stop(struct net_device *dev) 195 { 196 struct macvlan_dev *vlan = netdev_priv(dev); 197 struct net_device *lowerdev = vlan->lowerdev; 198 199 dev_mc_unsync(lowerdev, dev); 200 if (dev->flags & IFF_ALLMULTI) 201 dev_set_allmulti(lowerdev, -1); 202 203 dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN); 204 205 hlist_del_rcu(&vlan->hlist); 206 synchronize_rcu(); 207 return 0; 208 } 209 210 static void macvlan_change_rx_flags(struct net_device *dev, int change) 211 { 212 struct macvlan_dev *vlan = netdev_priv(dev); 213 struct net_device *lowerdev = vlan->lowerdev; 214 215 if (change & IFF_ALLMULTI) 216 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1); 217 } 218 219 static void macvlan_set_multicast_list(struct net_device *dev) 220 { 221 struct macvlan_dev *vlan = netdev_priv(dev); 222 223 dev_mc_sync(vlan->lowerdev, dev); 224 } 225 226 static int macvlan_change_mtu(struct net_device *dev, int new_mtu) 227 { 228 struct macvlan_dev *vlan = netdev_priv(dev); 229 230 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu) 231 return -EINVAL; 232 dev->mtu = new_mtu; 233 return 0; 234 } 235 236 /* 237 * macvlan network devices have devices nesting below it and are a special 238 * "super class" of normal network devices; split their locks off into a 239 * separate class since they always nest. 240 */ 241 static struct lock_class_key macvlan_netdev_xmit_lock_key; 242 243 #define MACVLAN_FEATURES \ 244 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ 245 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \ 246 NETIF_F_TSO_ECN | NETIF_F_TSO6) 247 248 #define MACVLAN_STATE_MASK \ 249 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT)) 250 251 static int macvlan_init(struct net_device *dev) 252 { 253 struct macvlan_dev *vlan = netdev_priv(dev); 254 const struct net_device *lowerdev = vlan->lowerdev; 255 256 dev->state = (dev->state & ~MACVLAN_STATE_MASK) | 257 (lowerdev->state & MACVLAN_STATE_MASK); 258 dev->features = lowerdev->features & MACVLAN_FEATURES; 259 dev->iflink = lowerdev->ifindex; 260 261 lockdep_set_class(&dev->_xmit_lock, &macvlan_netdev_xmit_lock_key); 262 return 0; 263 } 264 265 static void macvlan_ethtool_get_drvinfo(struct net_device *dev, 266 struct ethtool_drvinfo *drvinfo) 267 { 268 snprintf(drvinfo->driver, 32, "macvlan"); 269 snprintf(drvinfo->version, 32, "0.1"); 270 } 271 272 static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev) 273 { 274 const struct macvlan_dev *vlan = netdev_priv(dev); 275 struct net_device *lowerdev = vlan->lowerdev; 276 277 if (lowerdev->ethtool_ops->get_rx_csum == NULL) 278 return 0; 279 return lowerdev->ethtool_ops->get_rx_csum(lowerdev); 280 } 281 282 static const struct ethtool_ops macvlan_ethtool_ops = { 283 .get_link = ethtool_op_get_link, 284 .get_rx_csum = macvlan_ethtool_get_rx_csum, 285 .get_tx_csum = ethtool_op_get_tx_csum, 286 .get_tso = ethtool_op_get_tso, 287 .get_ufo = ethtool_op_get_ufo, 288 .get_sg = ethtool_op_get_sg, 289 .get_drvinfo = macvlan_ethtool_get_drvinfo, 290 }; 291 292 static void macvlan_setup(struct net_device *dev) 293 { 294 ether_setup(dev); 295 296 dev->init = macvlan_init; 297 dev->open = macvlan_open; 298 dev->stop = macvlan_stop; 299 dev->change_mtu = macvlan_change_mtu; 300 dev->change_rx_flags = macvlan_change_rx_flags; 301 dev->set_multicast_list = macvlan_set_multicast_list; 302 dev->hard_header = macvlan_hard_header; 303 dev->hard_start_xmit = macvlan_hard_start_xmit; 304 dev->destructor = free_netdev; 305 dev->ethtool_ops = &macvlan_ethtool_ops; 306 dev->tx_queue_len = 0; 307 } 308 309 static int macvlan_port_create(struct net_device *dev) 310 { 311 struct macvlan_port *port; 312 unsigned int i; 313 314 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK) 315 return -EINVAL; 316 317 port = kzalloc(sizeof(*port), GFP_KERNEL); 318 if (port == NULL) 319 return -ENOMEM; 320 321 port->dev = dev; 322 INIT_LIST_HEAD(&port->vlans); 323 for (i = 0; i < MACVLAN_HASH_SIZE; i++) 324 INIT_HLIST_HEAD(&port->vlan_hash[i]); 325 rcu_assign_pointer(dev->macvlan_port, port); 326 return 0; 327 } 328 329 static void macvlan_port_destroy(struct net_device *dev) 330 { 331 struct macvlan_port *port = dev->macvlan_port; 332 333 rcu_assign_pointer(dev->macvlan_port, NULL); 334 synchronize_rcu(); 335 kfree(port); 336 } 337 338 static void macvlan_transfer_operstate(struct net_device *dev) 339 { 340 struct macvlan_dev *vlan = netdev_priv(dev); 341 const struct net_device *lowerdev = vlan->lowerdev; 342 343 if (lowerdev->operstate == IF_OPER_DORMANT) 344 netif_dormant_on(dev); 345 else 346 netif_dormant_off(dev); 347 348 if (netif_carrier_ok(lowerdev)) { 349 if (!netif_carrier_ok(dev)) 350 netif_carrier_on(dev); 351 } else { 352 if (netif_carrier_ok(lowerdev)) 353 netif_carrier_off(dev); 354 } 355 } 356 357 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[]) 358 { 359 if (tb[IFLA_ADDRESS]) { 360 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 361 return -EINVAL; 362 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 363 return -EADDRNOTAVAIL; 364 } 365 return 0; 366 } 367 368 static int macvlan_newlink(struct net_device *dev, 369 struct nlattr *tb[], struct nlattr *data[]) 370 { 371 struct macvlan_dev *vlan = netdev_priv(dev); 372 struct macvlan_port *port; 373 struct net_device *lowerdev; 374 int err; 375 376 if (!tb[IFLA_LINK]) 377 return -EINVAL; 378 379 lowerdev = __dev_get_by_index(nla_get_u32(tb[IFLA_LINK])); 380 if (lowerdev == NULL) 381 return -ENODEV; 382 383 if (!tb[IFLA_MTU]) 384 dev->mtu = lowerdev->mtu; 385 else if (dev->mtu > lowerdev->mtu) 386 return -EINVAL; 387 388 if (!tb[IFLA_ADDRESS]) 389 random_ether_addr(dev->dev_addr); 390 391 if (lowerdev->macvlan_port == NULL) { 392 err = macvlan_port_create(lowerdev); 393 if (err < 0) 394 return err; 395 } 396 port = lowerdev->macvlan_port; 397 398 vlan->lowerdev = lowerdev; 399 vlan->dev = dev; 400 vlan->port = port; 401 402 err = register_netdevice(dev); 403 if (err < 0) 404 return err; 405 406 list_add_tail(&vlan->list, &port->vlans); 407 macvlan_transfer_operstate(dev); 408 return 0; 409 } 410 411 static void macvlan_dellink(struct net_device *dev) 412 { 413 struct macvlan_dev *vlan = netdev_priv(dev); 414 struct macvlan_port *port = vlan->port; 415 416 list_del(&vlan->list); 417 unregister_netdevice(dev); 418 419 if (list_empty(&port->vlans)) 420 macvlan_port_destroy(dev); 421 } 422 423 static struct rtnl_link_ops macvlan_link_ops __read_mostly = { 424 .kind = "macvlan", 425 .priv_size = sizeof(struct macvlan_dev), 426 .setup = macvlan_setup, 427 .validate = macvlan_validate, 428 .newlink = macvlan_newlink, 429 .dellink = macvlan_dellink, 430 }; 431 432 static int macvlan_device_event(struct notifier_block *unused, 433 unsigned long event, void *ptr) 434 { 435 struct net_device *dev = ptr; 436 struct macvlan_dev *vlan, *next; 437 struct macvlan_port *port; 438 439 port = dev->macvlan_port; 440 if (port == NULL) 441 return NOTIFY_DONE; 442 443 switch (event) { 444 case NETDEV_CHANGE: 445 list_for_each_entry(vlan, &port->vlans, list) 446 macvlan_transfer_operstate(vlan->dev); 447 break; 448 case NETDEV_FEAT_CHANGE: 449 list_for_each_entry(vlan, &port->vlans, list) { 450 vlan->dev->features = dev->features & MACVLAN_FEATURES; 451 netdev_features_change(vlan->dev); 452 } 453 break; 454 case NETDEV_UNREGISTER: 455 list_for_each_entry_safe(vlan, next, &port->vlans, list) 456 macvlan_dellink(vlan->dev); 457 break; 458 } 459 return NOTIFY_DONE; 460 } 461 462 static struct notifier_block macvlan_notifier_block __read_mostly = { 463 .notifier_call = macvlan_device_event, 464 }; 465 466 static int __init macvlan_init_module(void) 467 { 468 int err; 469 470 register_netdevice_notifier(&macvlan_notifier_block); 471 macvlan_handle_frame_hook = macvlan_handle_frame; 472 473 err = rtnl_link_register(&macvlan_link_ops); 474 if (err < 0) 475 goto err1; 476 return 0; 477 err1: 478 macvlan_handle_frame_hook = macvlan_handle_frame; 479 unregister_netdevice_notifier(&macvlan_notifier_block); 480 return err; 481 } 482 483 static void __exit macvlan_cleanup_module(void) 484 { 485 rtnl_link_unregister(&macvlan_link_ops); 486 macvlan_handle_frame_hook = NULL; 487 unregister_netdevice_notifier(&macvlan_notifier_block); 488 } 489 490 module_init(macvlan_init_module); 491 module_exit(macvlan_cleanup_module); 492 493 MODULE_LICENSE("GPL"); 494 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 495 MODULE_DESCRIPTION("Driver for MAC address based VLANs"); 496 MODULE_ALIAS_RTNL_LINK("macvlan"); 497