macvlan.c 21 KB

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  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/rculist.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. #include <net/xfrm.h>
  33. #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
  34. struct macvlan_port {
  35. struct net_device *dev;
  36. struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
  37. struct list_head vlans;
  38. struct rcu_head rcu;
  39. };
  40. #define macvlan_port_get_rcu(dev) \
  41. ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
  42. #define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
  43. #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
  44. static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
  45. const unsigned char *addr)
  46. {
  47. struct macvlan_dev *vlan;
  48. struct hlist_node *n;
  49. hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
  50. if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr))
  51. return vlan;
  52. }
  53. return NULL;
  54. }
  55. static void macvlan_hash_add(struct macvlan_dev *vlan)
  56. {
  57. struct macvlan_port *port = vlan->port;
  58. const unsigned char *addr = vlan->dev->dev_addr;
  59. hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
  60. }
  61. static void macvlan_hash_del(struct macvlan_dev *vlan)
  62. {
  63. hlist_del_rcu(&vlan->hlist);
  64. synchronize_rcu();
  65. }
  66. static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
  67. const unsigned char *addr)
  68. {
  69. macvlan_hash_del(vlan);
  70. /* Now that we are unhashed it is safe to change the device
  71. * address without confusing packet delivery.
  72. */
  73. memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
  74. macvlan_hash_add(vlan);
  75. }
  76. static int macvlan_addr_busy(const struct macvlan_port *port,
  77. const unsigned char *addr)
  78. {
  79. /* Test to see if the specified multicast address is
  80. * currently in use by the underlying device or
  81. * another macvlan.
  82. */
  83. if (!compare_ether_addr_64bits(port->dev->dev_addr, addr))
  84. return 1;
  85. if (macvlan_hash_lookup(port, addr))
  86. return 1;
  87. return 0;
  88. }
  89. static int macvlan_broadcast_one(struct sk_buff *skb,
  90. const struct macvlan_dev *vlan,
  91. const struct ethhdr *eth, bool local)
  92. {
  93. struct net_device *dev = vlan->dev;
  94. if (!skb)
  95. return NET_RX_DROP;
  96. if (local)
  97. return vlan->forward(dev, skb);
  98. skb->dev = dev;
  99. if (!compare_ether_addr_64bits(eth->h_dest,
  100. dev->broadcast))
  101. skb->pkt_type = PACKET_BROADCAST;
  102. else
  103. skb->pkt_type = PACKET_MULTICAST;
  104. return vlan->receive(skb);
  105. }
  106. static void macvlan_broadcast(struct sk_buff *skb,
  107. const struct macvlan_port *port,
  108. struct net_device *src,
  109. enum macvlan_mode mode)
  110. {
  111. const struct ethhdr *eth = eth_hdr(skb);
  112. const struct macvlan_dev *vlan;
  113. struct hlist_node *n;
  114. struct sk_buff *nskb;
  115. unsigned int i;
  116. int err;
  117. if (skb->protocol == htons(ETH_P_PAUSE))
  118. return;
  119. for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
  120. hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
  121. if (vlan->dev == src || !(vlan->mode & mode))
  122. continue;
  123. nskb = skb_clone(skb, GFP_ATOMIC);
  124. err = macvlan_broadcast_one(nskb, vlan, eth,
  125. mode == MACVLAN_MODE_BRIDGE);
  126. macvlan_count_rx(vlan, skb->len + ETH_HLEN,
  127. err == NET_RX_SUCCESS, 1);
  128. }
  129. }
  130. }
  131. /* called under rcu_read_lock() from netif_receive_skb */
  132. static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
  133. {
  134. struct macvlan_port *port;
  135. const struct ethhdr *eth = eth_hdr(skb);
  136. const struct macvlan_dev *vlan;
  137. const struct macvlan_dev *src;
  138. struct net_device *dev;
  139. unsigned int len = 0;
  140. int ret = NET_RX_DROP;
  141. port = macvlan_port_get_rcu(skb->dev);
  142. if (is_multicast_ether_addr(eth->h_dest)) {
  143. src = macvlan_hash_lookup(port, eth->h_source);
  144. if (!src)
  145. /* frame comes from an external address */
  146. macvlan_broadcast(skb, port, NULL,
  147. MACVLAN_MODE_PRIVATE |
  148. MACVLAN_MODE_VEPA |
  149. MACVLAN_MODE_BRIDGE);
  150. else if (src->mode == MACVLAN_MODE_VEPA)
  151. /* flood to everyone except source */
  152. macvlan_broadcast(skb, port, src->dev,
  153. MACVLAN_MODE_VEPA |
  154. MACVLAN_MODE_BRIDGE);
  155. else if (src->mode == MACVLAN_MODE_BRIDGE)
  156. /*
  157. * flood only to VEPA ports, bridge ports
  158. * already saw the frame on the way out.
  159. */
  160. macvlan_broadcast(skb, port, src->dev,
  161. MACVLAN_MODE_VEPA);
  162. return skb;
  163. }
  164. vlan = macvlan_hash_lookup(port, eth->h_dest);
  165. if (vlan == NULL)
  166. return skb;
  167. dev = vlan->dev;
  168. if (unlikely(!(dev->flags & IFF_UP))) {
  169. kfree_skb(skb);
  170. return NULL;
  171. }
  172. len = skb->len + ETH_HLEN;
  173. skb = skb_share_check(skb, GFP_ATOMIC);
  174. if (!skb)
  175. goto out;
  176. skb->dev = dev;
  177. skb->pkt_type = PACKET_HOST;
  178. ret = vlan->receive(skb);
  179. out:
  180. macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
  181. return NULL;
  182. }
  183. static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
  184. {
  185. const struct macvlan_dev *vlan = netdev_priv(dev);
  186. const struct macvlan_port *port = vlan->port;
  187. const struct macvlan_dev *dest;
  188. if (vlan->mode == MACVLAN_MODE_BRIDGE) {
  189. const struct ethhdr *eth = (void *)skb->data;
  190. /* send to other bridge ports directly */
  191. if (is_multicast_ether_addr(eth->h_dest)) {
  192. macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
  193. goto xmit_world;
  194. }
  195. dest = macvlan_hash_lookup(port, eth->h_dest);
  196. if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
  197. unsigned int length = skb->len + ETH_HLEN;
  198. int ret = dest->forward(dest->dev, skb);
  199. macvlan_count_rx(dest, length,
  200. ret == NET_RX_SUCCESS, 0);
  201. return NET_XMIT_SUCCESS;
  202. }
  203. }
  204. xmit_world:
  205. skb_set_dev(skb, vlan->lowerdev);
  206. return dev_queue_xmit(skb);
  207. }
  208. netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
  209. struct net_device *dev)
  210. {
  211. int i = skb_get_queue_mapping(skb);
  212. struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
  213. unsigned int len = skb->len;
  214. int ret;
  215. ret = macvlan_queue_xmit(skb, dev);
  216. if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
  217. txq->tx_packets++;
  218. txq->tx_bytes += len;
  219. } else
  220. txq->tx_dropped++;
  221. return ret;
  222. }
  223. EXPORT_SYMBOL_GPL(macvlan_start_xmit);
  224. static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
  225. unsigned short type, const void *daddr,
  226. const void *saddr, unsigned len)
  227. {
  228. const struct macvlan_dev *vlan = netdev_priv(dev);
  229. struct net_device *lowerdev = vlan->lowerdev;
  230. return dev_hard_header(skb, lowerdev, type, daddr,
  231. saddr ? : dev->dev_addr, len);
  232. }
  233. static const struct header_ops macvlan_hard_header_ops = {
  234. .create = macvlan_hard_header,
  235. .rebuild = eth_rebuild_header,
  236. .parse = eth_header_parse,
  237. .cache = eth_header_cache,
  238. .cache_update = eth_header_cache_update,
  239. };
  240. static int macvlan_open(struct net_device *dev)
  241. {
  242. struct macvlan_dev *vlan = netdev_priv(dev);
  243. struct net_device *lowerdev = vlan->lowerdev;
  244. int err;
  245. err = -EBUSY;
  246. if (macvlan_addr_busy(vlan->port, dev->dev_addr))
  247. goto out;
  248. err = dev_uc_add(lowerdev, dev->dev_addr);
  249. if (err < 0)
  250. goto out;
  251. if (dev->flags & IFF_ALLMULTI) {
  252. err = dev_set_allmulti(lowerdev, 1);
  253. if (err < 0)
  254. goto del_unicast;
  255. }
  256. macvlan_hash_add(vlan);
  257. return 0;
  258. del_unicast:
  259. dev_uc_del(lowerdev, dev->dev_addr);
  260. out:
  261. return err;
  262. }
  263. static int macvlan_stop(struct net_device *dev)
  264. {
  265. struct macvlan_dev *vlan = netdev_priv(dev);
  266. struct net_device *lowerdev = vlan->lowerdev;
  267. dev_mc_unsync(lowerdev, dev);
  268. if (dev->flags & IFF_ALLMULTI)
  269. dev_set_allmulti(lowerdev, -1);
  270. dev_uc_del(lowerdev, dev->dev_addr);
  271. macvlan_hash_del(vlan);
  272. return 0;
  273. }
  274. static int macvlan_set_mac_address(struct net_device *dev, void *p)
  275. {
  276. struct macvlan_dev *vlan = netdev_priv(dev);
  277. struct net_device *lowerdev = vlan->lowerdev;
  278. struct sockaddr *addr = p;
  279. int err;
  280. if (!is_valid_ether_addr(addr->sa_data))
  281. return -EADDRNOTAVAIL;
  282. if (!(dev->flags & IFF_UP)) {
  283. /* Just copy in the new address */
  284. memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
  285. } else {
  286. /* Rehash and update the device filters */
  287. if (macvlan_addr_busy(vlan->port, addr->sa_data))
  288. return -EBUSY;
  289. err = dev_uc_add(lowerdev, addr->sa_data);
  290. if (err)
  291. return err;
  292. dev_uc_del(lowerdev, dev->dev_addr);
  293. macvlan_hash_change_addr(vlan, addr->sa_data);
  294. }
  295. return 0;
  296. }
  297. static void macvlan_change_rx_flags(struct net_device *dev, int change)
  298. {
  299. struct macvlan_dev *vlan = netdev_priv(dev);
  300. struct net_device *lowerdev = vlan->lowerdev;
  301. if (change & IFF_ALLMULTI)
  302. dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
  303. }
  304. static void macvlan_set_multicast_list(struct net_device *dev)
  305. {
  306. struct macvlan_dev *vlan = netdev_priv(dev);
  307. dev_mc_sync(vlan->lowerdev, dev);
  308. }
  309. static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
  310. {
  311. struct macvlan_dev *vlan = netdev_priv(dev);
  312. if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
  313. return -EINVAL;
  314. dev->mtu = new_mtu;
  315. return 0;
  316. }
  317. /*
  318. * macvlan network devices have devices nesting below it and are a special
  319. * "super class" of normal network devices; split their locks off into a
  320. * separate class since they always nest.
  321. */
  322. static struct lock_class_key macvlan_netdev_xmit_lock_key;
  323. static struct lock_class_key macvlan_netdev_addr_lock_key;
  324. #define MACVLAN_FEATURES \
  325. (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
  326. NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
  327. NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO)
  328. #define MACVLAN_STATE_MASK \
  329. ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
  330. static void macvlan_set_lockdep_class_one(struct net_device *dev,
  331. struct netdev_queue *txq,
  332. void *_unused)
  333. {
  334. lockdep_set_class(&txq->_xmit_lock,
  335. &macvlan_netdev_xmit_lock_key);
  336. }
  337. static void macvlan_set_lockdep_class(struct net_device *dev)
  338. {
  339. lockdep_set_class(&dev->addr_list_lock,
  340. &macvlan_netdev_addr_lock_key);
  341. netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
  342. }
  343. static int macvlan_init(struct net_device *dev)
  344. {
  345. struct macvlan_dev *vlan = netdev_priv(dev);
  346. const struct net_device *lowerdev = vlan->lowerdev;
  347. dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
  348. (lowerdev->state & MACVLAN_STATE_MASK);
  349. dev->features = lowerdev->features & MACVLAN_FEATURES;
  350. dev->gso_max_size = lowerdev->gso_max_size;
  351. dev->iflink = lowerdev->ifindex;
  352. dev->hard_header_len = lowerdev->hard_header_len;
  353. macvlan_set_lockdep_class(dev);
  354. vlan->rx_stats = alloc_percpu(struct macvlan_rx_stats);
  355. if (!vlan->rx_stats)
  356. return -ENOMEM;
  357. return 0;
  358. }
  359. static void macvlan_uninit(struct net_device *dev)
  360. {
  361. struct macvlan_dev *vlan = netdev_priv(dev);
  362. free_percpu(vlan->rx_stats);
  363. }
  364. static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
  365. struct rtnl_link_stats64 *stats)
  366. {
  367. struct macvlan_dev *vlan = netdev_priv(dev);
  368. dev_txq_stats_fold(dev, stats);
  369. if (vlan->rx_stats) {
  370. struct macvlan_rx_stats *p, accum = {0};
  371. u64 rx_packets, rx_bytes, rx_multicast;
  372. unsigned int start;
  373. int i;
  374. for_each_possible_cpu(i) {
  375. p = per_cpu_ptr(vlan->rx_stats, i);
  376. do {
  377. start = u64_stats_fetch_begin_bh(&p->syncp);
  378. rx_packets = p->rx_packets;
  379. rx_bytes = p->rx_bytes;
  380. rx_multicast = p->rx_multicast;
  381. } while (u64_stats_fetch_retry_bh(&p->syncp, start));
  382. accum.rx_packets += rx_packets;
  383. accum.rx_bytes += rx_bytes;
  384. accum.rx_multicast += rx_multicast;
  385. /* rx_errors is an ulong, updated without syncp protection */
  386. accum.rx_errors += p->rx_errors;
  387. }
  388. stats->rx_packets = accum.rx_packets;
  389. stats->rx_bytes = accum.rx_bytes;
  390. stats->rx_errors = accum.rx_errors;
  391. stats->rx_dropped = accum.rx_errors;
  392. stats->multicast = accum.rx_multicast;
  393. }
  394. return stats;
  395. }
  396. static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
  397. struct ethtool_drvinfo *drvinfo)
  398. {
  399. snprintf(drvinfo->driver, 32, "macvlan");
  400. snprintf(drvinfo->version, 32, "0.1");
  401. }
  402. static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev)
  403. {
  404. const struct macvlan_dev *vlan = netdev_priv(dev);
  405. return dev_ethtool_get_rx_csum(vlan->lowerdev);
  406. }
  407. static int macvlan_ethtool_get_settings(struct net_device *dev,
  408. struct ethtool_cmd *cmd)
  409. {
  410. const struct macvlan_dev *vlan = netdev_priv(dev);
  411. return dev_ethtool_get_settings(vlan->lowerdev, cmd);
  412. }
  413. static u32 macvlan_ethtool_get_flags(struct net_device *dev)
  414. {
  415. const struct macvlan_dev *vlan = netdev_priv(dev);
  416. return dev_ethtool_get_flags(vlan->lowerdev);
  417. }
  418. static const struct ethtool_ops macvlan_ethtool_ops = {
  419. .get_link = ethtool_op_get_link,
  420. .get_settings = macvlan_ethtool_get_settings,
  421. .get_rx_csum = macvlan_ethtool_get_rx_csum,
  422. .get_drvinfo = macvlan_ethtool_get_drvinfo,
  423. .get_flags = macvlan_ethtool_get_flags,
  424. };
  425. static const struct net_device_ops macvlan_netdev_ops = {
  426. .ndo_init = macvlan_init,
  427. .ndo_uninit = macvlan_uninit,
  428. .ndo_open = macvlan_open,
  429. .ndo_stop = macvlan_stop,
  430. .ndo_start_xmit = macvlan_start_xmit,
  431. .ndo_change_mtu = macvlan_change_mtu,
  432. .ndo_change_rx_flags = macvlan_change_rx_flags,
  433. .ndo_set_mac_address = macvlan_set_mac_address,
  434. .ndo_set_multicast_list = macvlan_set_multicast_list,
  435. .ndo_get_stats64 = macvlan_dev_get_stats64,
  436. .ndo_validate_addr = eth_validate_addr,
  437. };
  438. void macvlan_common_setup(struct net_device *dev)
  439. {
  440. ether_setup(dev);
  441. dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
  442. dev->netdev_ops = &macvlan_netdev_ops;
  443. dev->destructor = free_netdev;
  444. dev->header_ops = &macvlan_hard_header_ops,
  445. dev->ethtool_ops = &macvlan_ethtool_ops;
  446. }
  447. EXPORT_SYMBOL_GPL(macvlan_common_setup);
  448. static void macvlan_setup(struct net_device *dev)
  449. {
  450. macvlan_common_setup(dev);
  451. dev->tx_queue_len = 0;
  452. }
  453. static int macvlan_port_create(struct net_device *dev)
  454. {
  455. struct macvlan_port *port;
  456. unsigned int i;
  457. int err;
  458. if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
  459. return -EINVAL;
  460. port = kzalloc(sizeof(*port), GFP_KERNEL);
  461. if (port == NULL)
  462. return -ENOMEM;
  463. port->dev = dev;
  464. INIT_LIST_HEAD(&port->vlans);
  465. for (i = 0; i < MACVLAN_HASH_SIZE; i++)
  466. INIT_HLIST_HEAD(&port->vlan_hash[i]);
  467. err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
  468. if (err)
  469. kfree(port);
  470. dev->priv_flags |= IFF_MACVLAN_PORT;
  471. return err;
  472. }
  473. static void macvlan_port_rcu_free(struct rcu_head *head)
  474. {
  475. struct macvlan_port *port;
  476. port = container_of(head, struct macvlan_port, rcu);
  477. kfree(port);
  478. }
  479. static void macvlan_port_destroy(struct net_device *dev)
  480. {
  481. struct macvlan_port *port = macvlan_port_get(dev);
  482. dev->priv_flags &= ~IFF_MACVLAN_PORT;
  483. netdev_rx_handler_unregister(dev);
  484. call_rcu(&port->rcu, macvlan_port_rcu_free);
  485. }
  486. static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
  487. {
  488. if (tb[IFLA_ADDRESS]) {
  489. if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
  490. return -EINVAL;
  491. if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
  492. return -EADDRNOTAVAIL;
  493. }
  494. if (data && data[IFLA_MACVLAN_MODE]) {
  495. switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
  496. case MACVLAN_MODE_PRIVATE:
  497. case MACVLAN_MODE_VEPA:
  498. case MACVLAN_MODE_BRIDGE:
  499. break;
  500. default:
  501. return -EINVAL;
  502. }
  503. }
  504. return 0;
  505. }
  506. static int macvlan_get_tx_queues(struct net *net,
  507. struct nlattr *tb[],
  508. unsigned int *num_tx_queues,
  509. unsigned int *real_num_tx_queues)
  510. {
  511. struct net_device *real_dev;
  512. if (!tb[IFLA_LINK])
  513. return -EINVAL;
  514. real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
  515. if (!real_dev)
  516. return -ENODEV;
  517. *num_tx_queues = real_dev->num_tx_queues;
  518. *real_num_tx_queues = real_dev->real_num_tx_queues;
  519. return 0;
  520. }
  521. int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
  522. struct nlattr *tb[], struct nlattr *data[],
  523. int (*receive)(struct sk_buff *skb),
  524. int (*forward)(struct net_device *dev,
  525. struct sk_buff *skb))
  526. {
  527. struct macvlan_dev *vlan = netdev_priv(dev);
  528. struct macvlan_port *port;
  529. struct net_device *lowerdev;
  530. int err;
  531. if (!tb[IFLA_LINK])
  532. return -EINVAL;
  533. lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
  534. if (lowerdev == NULL)
  535. return -ENODEV;
  536. /* When creating macvlans on top of other macvlans - use
  537. * the real device as the lowerdev.
  538. */
  539. if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
  540. struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
  541. lowerdev = lowervlan->lowerdev;
  542. }
  543. if (!tb[IFLA_MTU])
  544. dev->mtu = lowerdev->mtu;
  545. else if (dev->mtu > lowerdev->mtu)
  546. return -EINVAL;
  547. if (!tb[IFLA_ADDRESS])
  548. random_ether_addr(dev->dev_addr);
  549. if (!macvlan_port_exists(lowerdev)) {
  550. err = macvlan_port_create(lowerdev);
  551. if (err < 0)
  552. return err;
  553. }
  554. port = macvlan_port_get(lowerdev);
  555. vlan->lowerdev = lowerdev;
  556. vlan->dev = dev;
  557. vlan->port = port;
  558. vlan->receive = receive;
  559. vlan->forward = forward;
  560. vlan->mode = MACVLAN_MODE_VEPA;
  561. if (data && data[IFLA_MACVLAN_MODE])
  562. vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
  563. err = register_netdevice(dev);
  564. if (err < 0)
  565. goto destroy_port;
  566. list_add_tail(&vlan->list, &port->vlans);
  567. netif_stacked_transfer_operstate(lowerdev, dev);
  568. return 0;
  569. destroy_port:
  570. if (list_empty(&port->vlans))
  571. macvlan_port_destroy(lowerdev);
  572. return err;
  573. }
  574. EXPORT_SYMBOL_GPL(macvlan_common_newlink);
  575. static int macvlan_newlink(struct net *src_net, struct net_device *dev,
  576. struct nlattr *tb[], struct nlattr *data[])
  577. {
  578. return macvlan_common_newlink(src_net, dev, tb, data,
  579. netif_rx,
  580. dev_forward_skb);
  581. }
  582. void macvlan_dellink(struct net_device *dev, struct list_head *head)
  583. {
  584. struct macvlan_dev *vlan = netdev_priv(dev);
  585. struct macvlan_port *port = vlan->port;
  586. list_del(&vlan->list);
  587. unregister_netdevice_queue(dev, head);
  588. if (list_empty(&port->vlans))
  589. macvlan_port_destroy(port->dev);
  590. }
  591. EXPORT_SYMBOL_GPL(macvlan_dellink);
  592. static int macvlan_changelink(struct net_device *dev,
  593. struct nlattr *tb[], struct nlattr *data[])
  594. {
  595. struct macvlan_dev *vlan = netdev_priv(dev);
  596. if (data && data[IFLA_MACVLAN_MODE])
  597. vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
  598. return 0;
  599. }
  600. static size_t macvlan_get_size(const struct net_device *dev)
  601. {
  602. return nla_total_size(4);
  603. }
  604. static int macvlan_fill_info(struct sk_buff *skb,
  605. const struct net_device *dev)
  606. {
  607. struct macvlan_dev *vlan = netdev_priv(dev);
  608. NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
  609. return 0;
  610. nla_put_failure:
  611. return -EMSGSIZE;
  612. }
  613. static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
  614. [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
  615. };
  616. int macvlan_link_register(struct rtnl_link_ops *ops)
  617. {
  618. /* common fields */
  619. ops->priv_size = sizeof(struct macvlan_dev);
  620. ops->get_tx_queues = macvlan_get_tx_queues;
  621. ops->validate = macvlan_validate;
  622. ops->maxtype = IFLA_MACVLAN_MAX;
  623. ops->policy = macvlan_policy;
  624. ops->changelink = macvlan_changelink;
  625. ops->get_size = macvlan_get_size;
  626. ops->fill_info = macvlan_fill_info;
  627. return rtnl_link_register(ops);
  628. };
  629. EXPORT_SYMBOL_GPL(macvlan_link_register);
  630. static struct rtnl_link_ops macvlan_link_ops = {
  631. .kind = "macvlan",
  632. .setup = macvlan_setup,
  633. .newlink = macvlan_newlink,
  634. .dellink = macvlan_dellink,
  635. };
  636. static int macvlan_device_event(struct notifier_block *unused,
  637. unsigned long event, void *ptr)
  638. {
  639. struct net_device *dev = ptr;
  640. struct macvlan_dev *vlan, *next;
  641. struct macvlan_port *port;
  642. if (!macvlan_port_exists(dev))
  643. return NOTIFY_DONE;
  644. port = macvlan_port_get(dev);
  645. switch (event) {
  646. case NETDEV_CHANGE:
  647. list_for_each_entry(vlan, &port->vlans, list)
  648. netif_stacked_transfer_operstate(vlan->lowerdev,
  649. vlan->dev);
  650. break;
  651. case NETDEV_FEAT_CHANGE:
  652. list_for_each_entry(vlan, &port->vlans, list) {
  653. vlan->dev->features = dev->features & MACVLAN_FEATURES;
  654. vlan->dev->gso_max_size = dev->gso_max_size;
  655. netdev_features_change(vlan->dev);
  656. }
  657. break;
  658. case NETDEV_UNREGISTER:
  659. list_for_each_entry_safe(vlan, next, &port->vlans, list)
  660. vlan->dev->rtnl_link_ops->dellink(vlan->dev, NULL);
  661. break;
  662. case NETDEV_PRE_TYPE_CHANGE:
  663. /* Forbid underlaying device to change its type. */
  664. return NOTIFY_BAD;
  665. }
  666. return NOTIFY_DONE;
  667. }
  668. static struct notifier_block macvlan_notifier_block __read_mostly = {
  669. .notifier_call = macvlan_device_event,
  670. };
  671. static int __init macvlan_init_module(void)
  672. {
  673. int err;
  674. register_netdevice_notifier(&macvlan_notifier_block);
  675. err = macvlan_link_register(&macvlan_link_ops);
  676. if (err < 0)
  677. goto err1;
  678. return 0;
  679. err1:
  680. unregister_netdevice_notifier(&macvlan_notifier_block);
  681. return err;
  682. }
  683. static void __exit macvlan_cleanup_module(void)
  684. {
  685. rtnl_link_unregister(&macvlan_link_ops);
  686. unregister_netdevice_notifier(&macvlan_notifier_block);
  687. }
  688. module_init(macvlan_init_module);
  689. module_exit(macvlan_cleanup_module);
  690. MODULE_LICENSE("GPL");
  691. MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
  692. MODULE_DESCRIPTION("Driver for MAC address based VLANs");
  693. MODULE_ALIAS_RTNL_LINK("macvlan");