blob: 6749acf6f3f4776f3dc3dd3ac9a8678d59485cb7 [file] [log] [blame]
lh9ed821d2023-04-07 01:36:19 -07001/*
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_vlan.h>
30#include <linux/if_link.h>
31#include <linux/if_macvlan.h>
32#include <net/rtnetlink.h>
33#include <net/xfrm.h>
34
35#define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
36
37struct macvlan_port {
38 struct net_device *dev;
39 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
40 struct list_head vlans;
41 struct rcu_head rcu;
42 bool passthru;
43 int count;
44};
45
46static void macvlan_port_destroy(struct net_device *dev);
47
48#define macvlan_port_get_rcu(dev) \
49 ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
50#define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
51#define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
52
53static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
54 const unsigned char *addr)
55{
56 struct macvlan_dev *vlan;
57 struct hlist_node *n;
58
59 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
60 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr))
61 return vlan;
62 }
63 return NULL;
64}
65
66static void macvlan_hash_add(struct macvlan_dev *vlan)
67{
68 struct macvlan_port *port = vlan->port;
69 const unsigned char *addr = vlan->dev->dev_addr;
70
71 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
72}
73
74static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
75{
76 hlist_del_rcu(&vlan->hlist);
77 if (sync)
78 synchronize_rcu();
79}
80
81static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
82 const unsigned char *addr)
83{
84 macvlan_hash_del(vlan, true);
85 /* Now that we are unhashed it is safe to change the device
86 * address without confusing packet delivery.
87 */
88 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
89 macvlan_hash_add(vlan);
90}
91
92static int macvlan_addr_busy(const struct macvlan_port *port,
93 const unsigned char *addr)
94{
95 /* Test to see if the specified multicast address is
96 * currently in use by the underlying device or
97 * another macvlan.
98 */
99 if (!compare_ether_addr_64bits(port->dev->dev_addr, addr))
100 return 1;
101
102 if (macvlan_hash_lookup(port, addr))
103 return 1;
104
105 return 0;
106}
107
108
109static int macvlan_broadcast_one(struct sk_buff *skb,
110 const struct macvlan_dev *vlan,
111 const struct ethhdr *eth, bool local)
112{
113 struct net_device *dev = vlan->dev;
114 if (!skb)
115 return NET_RX_DROP;
116
117 if (local)
118 return vlan->forward(dev, skb);
119
120 skb->dev = dev;
121 if (!compare_ether_addr_64bits(eth->h_dest,
122 dev->broadcast))
123 skb->pkt_type = PACKET_BROADCAST;
124 else
125 skb->pkt_type = PACKET_MULTICAST;
126
127 return vlan->receive(skb);
128}
129
130static void macvlan_broadcast(struct sk_buff *skb,
131 const struct macvlan_port *port,
132 struct net_device *src,
133 enum macvlan_mode mode)
134{
135 const struct ethhdr *eth = eth_hdr(skb);
136 const struct macvlan_dev *vlan;
137 struct hlist_node *n;
138 struct sk_buff *nskb;
139 unsigned int i;
140 int err;
141
142 if (skb->protocol == htons(ETH_P_PAUSE))
143 return;
144
145 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
146 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
147 if (vlan->dev == src || !(vlan->mode & mode))
148 continue;
149
150 nskb = skb_clone(skb, GFP_ATOMIC);
151 err = macvlan_broadcast_one(nskb, vlan, eth,
152 mode == MACVLAN_MODE_BRIDGE);
153 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
154 err == NET_RX_SUCCESS, 1);
155 }
156 }
157}
158
159/* called under rcu_read_lock() from netif_receive_skb */
160static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
161{
162 struct macvlan_port *port;
163 struct sk_buff *skb = *pskb;
164 const struct ethhdr *eth = eth_hdr(skb);
165 const struct macvlan_dev *vlan;
166 const struct macvlan_dev *src;
167 struct net_device *dev;
168 unsigned int len = 0;
169 int ret = NET_RX_DROP;
170
171 port = macvlan_port_get_rcu(skb->dev);
172 if (is_multicast_ether_addr(eth->h_dest)) {
173 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
174 if (!skb)
175 return RX_HANDLER_CONSUMED;
176 eth = eth_hdr(skb);
177 src = macvlan_hash_lookup(port, eth->h_source);
178 if (!src)
179 /* frame comes from an external address */
180 macvlan_broadcast(skb, port, NULL,
181 MACVLAN_MODE_PRIVATE |
182 MACVLAN_MODE_VEPA |
183 MACVLAN_MODE_PASSTHRU|
184 MACVLAN_MODE_BRIDGE);
185 else if (src->mode == MACVLAN_MODE_VEPA)
186 /* flood to everyone except source */
187 macvlan_broadcast(skb, port, src->dev,
188 MACVLAN_MODE_VEPA |
189 MACVLAN_MODE_BRIDGE);
190 else if (src->mode == MACVLAN_MODE_BRIDGE)
191 /*
192 * flood only to VEPA ports, bridge ports
193 * already saw the frame on the way out.
194 */
195 macvlan_broadcast(skb, port, src->dev,
196 MACVLAN_MODE_VEPA);
197 else {
198 /* forward to original port. */
199 vlan = src;
200 ret = macvlan_broadcast_one(skb, vlan, eth, 0);
201 goto out;
202 }
203
204 return RX_HANDLER_PASS;
205 }
206
207 if (port->passthru)
208 vlan = list_first_or_null_rcu(&port->vlans,
209 struct macvlan_dev, list);
210 else
211 vlan = macvlan_hash_lookup(port, eth->h_dest);
212 if (vlan == NULL)
213 return RX_HANDLER_PASS;
214
215 dev = vlan->dev;
216 if (unlikely(!(dev->flags & IFF_UP))) {
217 kfree_skb(skb);
218 return RX_HANDLER_CONSUMED;
219 }
220 len = skb->len + ETH_HLEN;
221 skb = skb_share_check(skb, GFP_ATOMIC);
222 if (!skb)
223 goto out;
224
225 skb->dev = dev;
226 skb->pkt_type = PACKET_HOST;
227
228 ret = vlan->receive(skb);
229
230out:
231 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
232 return RX_HANDLER_CONSUMED;
233}
234
235static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
236{
237 const struct macvlan_dev *vlan = netdev_priv(dev);
238 const struct macvlan_port *port = vlan->port;
239 const struct macvlan_dev *dest;
240
241 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
242 const struct ethhdr *eth = (void *)skb->data;
243
244 /* send to other bridge ports directly */
245 if (is_multicast_ether_addr(eth->h_dest)) {
246 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
247 goto xmit_world;
248 }
249
250 dest = macvlan_hash_lookup(port, eth->h_dest);
251 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
252 /* send to lowerdev first for its network taps */
253 dev_forward_skb(vlan->lowerdev, skb);
254
255 return NET_XMIT_SUCCESS;
256 }
257 }
258
259xmit_world:
260 skb->dev = vlan->lowerdev;
261 return dev_queue_xmit(skb);
262}
263
264netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
265 struct net_device *dev)
266{
267 unsigned int len = skb->len;
268 int ret;
269 const struct macvlan_dev *vlan = netdev_priv(dev);
270
271 ret = macvlan_queue_xmit(skb, dev);
272 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
273 struct macvlan_pcpu_stats *pcpu_stats;
274
275 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
276 u64_stats_update_begin(&pcpu_stats->syncp);
277 pcpu_stats->tx_packets++;
278 pcpu_stats->tx_bytes += len;
279 u64_stats_update_end(&pcpu_stats->syncp);
280 } else {
281 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
282 }
283 return ret;
284}
285EXPORT_SYMBOL_GPL(macvlan_start_xmit);
286
287static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
288 unsigned short type, const void *daddr,
289 const void *saddr, unsigned len)
290{
291 const struct macvlan_dev *vlan = netdev_priv(dev);
292 struct net_device *lowerdev = vlan->lowerdev;
293
294 return dev_hard_header(skb, lowerdev, type, daddr,
295 saddr ? : dev->dev_addr, len);
296}
297
298static const struct header_ops macvlan_hard_header_ops = {
299 .create = macvlan_hard_header,
300 .rebuild = eth_rebuild_header,
301 .parse = eth_header_parse,
302 .cache = eth_header_cache,
303 .cache_update = eth_header_cache_update,
304};
305
306static int macvlan_open(struct net_device *dev)
307{
308 struct macvlan_dev *vlan = netdev_priv(dev);
309 struct net_device *lowerdev = vlan->lowerdev;
310 int err;
311
312 if (vlan->port->passthru) {
313 dev_set_promiscuity(lowerdev, 1);
314 goto hash_add;
315 }
316
317 err = -EBUSY;
318 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
319 goto out;
320
321 err = dev_uc_add(lowerdev, dev->dev_addr);
322 if (err < 0)
323 goto out;
324 if (dev->flags & IFF_ALLMULTI) {
325 err = dev_set_allmulti(lowerdev, 1);
326 if (err < 0)
327 goto del_unicast;
328 }
329
330hash_add:
331 macvlan_hash_add(vlan);
332 return 0;
333
334del_unicast:
335 dev_uc_del(lowerdev, dev->dev_addr);
336out:
337 return err;
338}
339
340static int macvlan_stop(struct net_device *dev)
341{
342 struct macvlan_dev *vlan = netdev_priv(dev);
343 struct net_device *lowerdev = vlan->lowerdev;
344
345 if (vlan->port->passthru) {
346 dev_set_promiscuity(lowerdev, -1);
347 goto hash_del;
348 }
349
350 dev_mc_unsync(lowerdev, dev);
351 if (dev->flags & IFF_ALLMULTI)
352 dev_set_allmulti(lowerdev, -1);
353
354 dev_uc_del(lowerdev, dev->dev_addr);
355
356hash_del:
357 macvlan_hash_del(vlan, !dev->dismantle);
358 return 0;
359}
360
361static int macvlan_set_mac_address(struct net_device *dev, void *p)
362{
363 struct macvlan_dev *vlan = netdev_priv(dev);
364 struct net_device *lowerdev = vlan->lowerdev;
365 struct sockaddr *addr = p;
366 int err;
367
368 if (!is_valid_ether_addr(addr->sa_data))
369 return -EADDRNOTAVAIL;
370
371 if (!(dev->flags & IFF_UP)) {
372 /* Just copy in the new address */
373 dev->addr_assign_type &= ~NET_ADDR_RANDOM;
374 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
375 } else {
376 /* Rehash and update the device filters */
377 if (macvlan_addr_busy(vlan->port, addr->sa_data))
378 return -EBUSY;
379
380 err = dev_uc_add(lowerdev, addr->sa_data);
381 if (err)
382 return err;
383
384 dev_uc_del(lowerdev, dev->dev_addr);
385
386 macvlan_hash_change_addr(vlan, addr->sa_data);
387 }
388 return 0;
389}
390
391static void macvlan_change_rx_flags(struct net_device *dev, int change)
392{
393 struct macvlan_dev *vlan = netdev_priv(dev);
394 struct net_device *lowerdev = vlan->lowerdev;
395
396 if (change & IFF_ALLMULTI)
397 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
398}
399
400static void macvlan_set_multicast_list(struct net_device *dev)
401{
402 struct macvlan_dev *vlan = netdev_priv(dev);
403
404 dev_mc_sync(vlan->lowerdev, dev);
405}
406
407static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
408{
409 struct macvlan_dev *vlan = netdev_priv(dev);
410
411 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
412 return -EINVAL;
413 dev->mtu = new_mtu;
414 return 0;
415}
416
417/*
418 * macvlan network devices have devices nesting below it and are a special
419 * "super class" of normal network devices; split their locks off into a
420 * separate class since they always nest.
421 */
422static struct lock_class_key macvlan_netdev_xmit_lock_key;
423static struct lock_class_key macvlan_netdev_addr_lock_key;
424
425#define MACVLAN_FEATURES \
426 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
427 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
428 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
429 NETIF_F_HW_VLAN_FILTER)
430
431#define MACVLAN_STATE_MASK \
432 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
433
434static void macvlan_set_lockdep_class_one(struct net_device *dev,
435 struct netdev_queue *txq,
436 void *_unused)
437{
438 lockdep_set_class(&txq->_xmit_lock,
439 &macvlan_netdev_xmit_lock_key);
440}
441
442static void macvlan_set_lockdep_class(struct net_device *dev)
443{
444 lockdep_set_class(&dev->addr_list_lock,
445 &macvlan_netdev_addr_lock_key);
446 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
447}
448
449static int macvlan_init(struct net_device *dev)
450{
451 struct macvlan_dev *vlan = netdev_priv(dev);
452 const struct net_device *lowerdev = vlan->lowerdev;
453
454 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
455 (lowerdev->state & MACVLAN_STATE_MASK);
456 dev->features = lowerdev->features & MACVLAN_FEATURES;
457 dev->features |= NETIF_F_LLTX;
458 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
459 dev->gso_max_size = lowerdev->gso_max_size;
460 dev->iflink = lowerdev->ifindex;
461 dev->hard_header_len = lowerdev->hard_header_len;
462
463 macvlan_set_lockdep_class(dev);
464
465 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
466 if (!vlan->pcpu_stats)
467 return -ENOMEM;
468
469 return 0;
470}
471
472static void macvlan_uninit(struct net_device *dev)
473{
474 struct macvlan_dev *vlan = netdev_priv(dev);
475 struct macvlan_port *port = vlan->port;
476
477 free_percpu(vlan->pcpu_stats);
478
479 port->count -= 1;
480 if (!port->count)
481 macvlan_port_destroy(port->dev);
482}
483
484static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
485 struct rtnl_link_stats64 *stats)
486{
487 struct macvlan_dev *vlan = netdev_priv(dev);
488
489 if (vlan->pcpu_stats) {
490 struct macvlan_pcpu_stats *p;
491 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
492 u32 rx_errors = 0, tx_dropped = 0;
493 unsigned int start;
494 int i;
495
496 for_each_possible_cpu(i) {
497 p = per_cpu_ptr(vlan->pcpu_stats, i);
498 do {
499 start = u64_stats_fetch_begin_bh(&p->syncp);
500 rx_packets = p->rx_packets;
501 rx_bytes = p->rx_bytes;
502 rx_multicast = p->rx_multicast;
503 tx_packets = p->tx_packets;
504 tx_bytes = p->tx_bytes;
505 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
506
507 stats->rx_packets += rx_packets;
508 stats->rx_bytes += rx_bytes;
509 stats->multicast += rx_multicast;
510 stats->tx_packets += tx_packets;
511 stats->tx_bytes += tx_bytes;
512 /* rx_errors & tx_dropped are u32, updated
513 * without syncp protection.
514 */
515 rx_errors += p->rx_errors;
516 tx_dropped += p->tx_dropped;
517 }
518 stats->rx_errors = rx_errors;
519 stats->rx_dropped = rx_errors;
520 stats->tx_dropped = tx_dropped;
521 }
522 return stats;
523}
524
525static int macvlan_vlan_rx_add_vid(struct net_device *dev,
526 unsigned short vid)
527{
528 struct macvlan_dev *vlan = netdev_priv(dev);
529 struct net_device *lowerdev = vlan->lowerdev;
530
531 return vlan_vid_add(lowerdev, vid);
532}
533
534static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
535 unsigned short vid)
536{
537 struct macvlan_dev *vlan = netdev_priv(dev);
538 struct net_device *lowerdev = vlan->lowerdev;
539
540 vlan_vid_del(lowerdev, vid);
541 return 0;
542}
543
544static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
545 struct ethtool_drvinfo *drvinfo)
546{
547 snprintf(drvinfo->driver, 32, "macvlan");
548 snprintf(drvinfo->version, 32, "0.1");
549}
550
551static int macvlan_ethtool_get_settings(struct net_device *dev,
552 struct ethtool_cmd *cmd)
553{
554 const struct macvlan_dev *vlan = netdev_priv(dev);
555
556 return __ethtool_get_settings(vlan->lowerdev, cmd);
557}
558
559static const struct ethtool_ops macvlan_ethtool_ops = {
560 .get_link = ethtool_op_get_link,
561 .get_settings = macvlan_ethtool_get_settings,
562 .get_drvinfo = macvlan_ethtool_get_drvinfo,
563};
564
565static const struct net_device_ops macvlan_netdev_ops = {
566 .ndo_init = macvlan_init,
567 .ndo_uninit = macvlan_uninit,
568 .ndo_open = macvlan_open,
569 .ndo_stop = macvlan_stop,
570 .ndo_start_xmit = macvlan_start_xmit,
571 .ndo_change_mtu = macvlan_change_mtu,
572 .ndo_change_rx_flags = macvlan_change_rx_flags,
573 .ndo_set_mac_address = macvlan_set_mac_address,
574 .ndo_set_rx_mode = macvlan_set_multicast_list,
575 .ndo_get_stats64 = macvlan_dev_get_stats64,
576 .ndo_validate_addr = eth_validate_addr,
577 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
578 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
579};
580
581void macvlan_common_setup(struct net_device *dev)
582{
583 ether_setup(dev);
584
585 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
586 dev->priv_flags |= IFF_UNICAST_FLT;
587 dev->netdev_ops = &macvlan_netdev_ops;
588 dev->destructor = free_netdev;
589 dev->header_ops = &macvlan_hard_header_ops,
590 dev->ethtool_ops = &macvlan_ethtool_ops;
591}
592EXPORT_SYMBOL_GPL(macvlan_common_setup);
593
594static void macvlan_setup(struct net_device *dev)
595{
596 macvlan_common_setup(dev);
597 dev->tx_queue_len = 0;
598}
599
600static int macvlan_port_create(struct net_device *dev)
601{
602 struct macvlan_port *port;
603 unsigned int i;
604 int err;
605
606 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
607 return -EINVAL;
608
609 port = kzalloc(sizeof(*port), GFP_KERNEL);
610 if (port == NULL)
611 return -ENOMEM;
612
613 port->passthru = false;
614 port->dev = dev;
615 INIT_LIST_HEAD(&port->vlans);
616 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
617 INIT_HLIST_HEAD(&port->vlan_hash[i]);
618
619 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
620 if (err)
621 kfree(port);
622 else
623 dev->priv_flags |= IFF_MACVLAN_PORT;
624 return err;
625}
626
627static void macvlan_port_destroy(struct net_device *dev)
628{
629 struct macvlan_port *port = macvlan_port_get(dev);
630
631 dev->priv_flags &= ~IFF_MACVLAN_PORT;
632 netdev_rx_handler_unregister(dev);
633 kfree_rcu(port, rcu);
634}
635
636static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
637{
638 if (tb[IFLA_ADDRESS]) {
639 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
640 return -EINVAL;
641 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
642 return -EADDRNOTAVAIL;
643 }
644
645 if (data && data[IFLA_MACVLAN_MODE]) {
646 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
647 case MACVLAN_MODE_PRIVATE:
648 case MACVLAN_MODE_VEPA:
649 case MACVLAN_MODE_BRIDGE:
650 case MACVLAN_MODE_PASSTHRU:
651 break;
652 default:
653 return -EINVAL;
654 }
655 }
656 return 0;
657}
658
659int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
660 struct nlattr *tb[], struct nlattr *data[],
661 int (*receive)(struct sk_buff *skb),
662 int (*forward)(struct net_device *dev,
663 struct sk_buff *skb))
664{
665 struct macvlan_dev *vlan = netdev_priv(dev);
666 struct macvlan_port *port;
667 struct net_device *lowerdev;
668 int err;
669
670 if (!tb[IFLA_LINK])
671 return -EINVAL;
672
673 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
674 if (lowerdev == NULL)
675 return -ENODEV;
676
677 /* When creating macvlans on top of other macvlans - use
678 * the real device as the lowerdev.
679 */
680 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
681 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
682 lowerdev = lowervlan->lowerdev;
683 }
684
685 if (!tb[IFLA_MTU])
686 dev->mtu = lowerdev->mtu;
687 else if (dev->mtu > lowerdev->mtu)
688 return -EINVAL;
689
690 if (!tb[IFLA_ADDRESS])
691 eth_hw_addr_random(dev);
692
693 if (!macvlan_port_exists(lowerdev)) {
694 err = macvlan_port_create(lowerdev);
695 if (err < 0)
696 return err;
697 }
698 port = macvlan_port_get(lowerdev);
699
700 /* Only 1 macvlan device can be created in passthru mode */
701 if (port->passthru)
702 return -EINVAL;
703
704 vlan->lowerdev = lowerdev;
705 vlan->dev = dev;
706 vlan->port = port;
707 vlan->receive = receive;
708 vlan->forward = forward;
709
710 vlan->mode = MACVLAN_MODE_VEPA;
711 if (data && data[IFLA_MACVLAN_MODE])
712 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
713
714 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
715 if (port->count)
716 return -EINVAL;
717 port->passthru = true;
718 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
719 }
720
721 port->count += 1;
722 err = register_netdevice(dev);
723 if (err < 0)
724 goto destroy_port;
725
726 list_add_tail_rcu(&vlan->list, &port->vlans);
727 netif_stacked_transfer_operstate(lowerdev, dev);
728
729 return 0;
730
731destroy_port:
732 port->count -= 1;
733 if (!port->count)
734 macvlan_port_destroy(lowerdev);
735
736 return err;
737}
738EXPORT_SYMBOL_GPL(macvlan_common_newlink);
739
740static int macvlan_newlink(struct net *src_net, struct net_device *dev,
741 struct nlattr *tb[], struct nlattr *data[])
742{
743 return macvlan_common_newlink(src_net, dev, tb, data,
744 netif_rx,
745 dev_forward_skb);
746}
747
748void macvlan_dellink(struct net_device *dev, struct list_head *head)
749{
750 struct macvlan_dev *vlan = netdev_priv(dev);
751
752 list_del_rcu(&vlan->list);
753 unregister_netdevice_queue(dev, head);
754}
755EXPORT_SYMBOL_GPL(macvlan_dellink);
756
757static int macvlan_changelink(struct net_device *dev,
758 struct nlattr *tb[], struct nlattr *data[])
759{
760 struct macvlan_dev *vlan = netdev_priv(dev);
761 if (data && data[IFLA_MACVLAN_MODE])
762 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
763 return 0;
764}
765
766static size_t macvlan_get_size(const struct net_device *dev)
767{
768 return nla_total_size(4);
769}
770
771static int macvlan_fill_info(struct sk_buff *skb,
772 const struct net_device *dev)
773{
774 struct macvlan_dev *vlan = netdev_priv(dev);
775
776 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
777 return 0;
778
779nla_put_failure:
780 return -EMSGSIZE;
781}
782
783static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
784 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
785};
786
787int macvlan_link_register(struct rtnl_link_ops *ops)
788{
789 /* common fields */
790 ops->priv_size = sizeof(struct macvlan_dev);
791 ops->validate = macvlan_validate;
792 ops->maxtype = IFLA_MACVLAN_MAX;
793 ops->policy = macvlan_policy;
794 ops->changelink = macvlan_changelink;
795 ops->get_size = macvlan_get_size;
796 ops->fill_info = macvlan_fill_info;
797
798 return rtnl_link_register(ops);
799};
800EXPORT_SYMBOL_GPL(macvlan_link_register);
801
802static struct rtnl_link_ops macvlan_link_ops = {
803 .kind = "macvlan",
804 .setup = macvlan_setup,
805 .newlink = macvlan_newlink,
806 .dellink = macvlan_dellink,
807};
808
809static int macvlan_device_event(struct notifier_block *unused,
810 unsigned long event, void *ptr)
811{
812 struct net_device *dev = ptr;
813 struct macvlan_dev *vlan, *next;
814 struct macvlan_port *port;
815 LIST_HEAD(list_kill);
816
817 if (!macvlan_port_exists(dev))
818 return NOTIFY_DONE;
819
820 port = macvlan_port_get(dev);
821
822 switch (event) {
823 case NETDEV_CHANGE:
824 list_for_each_entry(vlan, &port->vlans, list)
825 netif_stacked_transfer_operstate(vlan->lowerdev,
826 vlan->dev);
827 break;
828 case NETDEV_FEAT_CHANGE:
829 list_for_each_entry(vlan, &port->vlans, list) {
830 vlan->dev->features = dev->features & MACVLAN_FEATURES;
831 vlan->dev->gso_max_size = dev->gso_max_size;
832 netdev_features_change(vlan->dev);
833 }
834 break;
835 case NETDEV_UNREGISTER:
836 /* twiddle thumbs on netns device moves */
837 if (dev->reg_state != NETREG_UNREGISTERING)
838 break;
839
840 list_for_each_entry_safe(vlan, next, &port->vlans, list)
841 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
842 unregister_netdevice_many(&list_kill);
843 list_del(&list_kill);
844 break;
845 case NETDEV_PRE_TYPE_CHANGE:
846 /* Forbid underlaying device to change its type. */
847 return NOTIFY_BAD;
848 }
849 return NOTIFY_DONE;
850}
851
852static struct notifier_block macvlan_notifier_block __read_mostly = {
853 .notifier_call = macvlan_device_event,
854};
855
856static int __init macvlan_init_module(void)
857{
858 int err;
859
860 register_netdevice_notifier(&macvlan_notifier_block);
861
862 err = macvlan_link_register(&macvlan_link_ops);
863 if (err < 0)
864 goto err1;
865 return 0;
866err1:
867 unregister_netdevice_notifier(&macvlan_notifier_block);
868 return err;
869}
870
871static void __exit macvlan_cleanup_module(void)
872{
873 rtnl_link_unregister(&macvlan_link_ops);
874 unregister_netdevice_notifier(&macvlan_notifier_block);
875}
876
877module_init(macvlan_init_module);
878module_exit(macvlan_cleanup_module);
879
880MODULE_LICENSE("GPL");
881MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
882MODULE_DESCRIPTION("Driver for MAC address based VLANs");
883MODULE_ALIAS_RTNL_LINK("macvlan");