Version:  2.0.40 2.2.26 2.4.37 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2

Linux/drivers/net/macvlan.c

  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_vlan.h>
 30 #include <linux/if_link.h>
 31 #include <linux/if_macvlan.h>
 32 #include <linux/hash.h>
 33 #include <linux/workqueue.h>
 34 #include <net/rtnetlink.h>
 35 #include <net/xfrm.h>
 36 #include <linux/netpoll.h>
 37 
 38 #define MACVLAN_HASH_BITS       8
 39 #define MACVLAN_HASH_SIZE       (1<<MACVLAN_HASH_BITS)
 40 #define MACVLAN_BC_QUEUE_LEN    1000
 41 
 42 struct macvlan_port {
 43         struct net_device       *dev;
 44         struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
 45         struct list_head        vlans;
 46         struct rcu_head         rcu;
 47         struct sk_buff_head     bc_queue;
 48         struct work_struct      bc_work;
 49         bool                    passthru;
 50         int                     count;
 51         struct hlist_head       vlan_source_hash[MACVLAN_HASH_SIZE];
 52 };
 53 
 54 struct macvlan_source_entry {
 55         struct hlist_node       hlist;
 56         struct macvlan_dev      *vlan;
 57         unsigned char           addr[6+2] __aligned(sizeof(u16));
 58         struct rcu_head         rcu;
 59 };
 60 
 61 struct macvlan_skb_cb {
 62         const struct macvlan_dev *src;
 63 };
 64 
 65 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
 66 
 67 static void macvlan_port_destroy(struct net_device *dev);
 68 
 69 /* Hash Ethernet address */
 70 static u32 macvlan_eth_hash(const unsigned char *addr)
 71 {
 72         u64 value = get_unaligned((u64 *)addr);
 73 
 74         /* only want 6 bytes */
 75 #ifdef __BIG_ENDIAN
 76         value >>= 16;
 77 #else
 78         value <<= 16;
 79 #endif
 80         return hash_64(value, MACVLAN_HASH_BITS);
 81 }
 82 
 83 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
 84 {
 85         return rcu_dereference(dev->rx_handler_data);
 86 }
 87 
 88 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
 89 {
 90         return rtnl_dereference(dev->rx_handler_data);
 91 }
 92 
 93 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
 94 
 95 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
 96                                                const unsigned char *addr)
 97 {
 98         struct macvlan_dev *vlan;
 99         u32 idx = macvlan_eth_hash(addr);
100 
101         hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) {
102                 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
103                         return vlan;
104         }
105         return NULL;
106 }
107 
108 static struct macvlan_source_entry *macvlan_hash_lookup_source(
109         const struct macvlan_dev *vlan,
110         const unsigned char *addr)
111 {
112         struct macvlan_source_entry *entry;
113         u32 idx = macvlan_eth_hash(addr);
114         struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
115 
116         hlist_for_each_entry_rcu(entry, h, hlist) {
117                 if (ether_addr_equal_64bits(entry->addr, addr) &&
118                     entry->vlan == vlan)
119                         return entry;
120         }
121         return NULL;
122 }
123 
124 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
125                                    const unsigned char *addr)
126 {
127         struct macvlan_port *port = vlan->port;
128         struct macvlan_source_entry *entry;
129         struct hlist_head *h;
130 
131         entry = macvlan_hash_lookup_source(vlan, addr);
132         if (entry)
133                 return 0;
134 
135         entry = kmalloc(sizeof(*entry), GFP_KERNEL);
136         if (!entry)
137                 return -ENOMEM;
138 
139         ether_addr_copy(entry->addr, addr);
140         entry->vlan = vlan;
141         h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
142         hlist_add_head_rcu(&entry->hlist, h);
143         vlan->macaddr_count++;
144 
145         return 0;
146 }
147 
148 static void macvlan_hash_add(struct macvlan_dev *vlan)
149 {
150         struct macvlan_port *port = vlan->port;
151         const unsigned char *addr = vlan->dev->dev_addr;
152         u32 idx = macvlan_eth_hash(addr);
153 
154         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
155 }
156 
157 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
158 {
159         hlist_del_rcu(&entry->hlist);
160         kfree_rcu(entry, rcu);
161 }
162 
163 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
164 {
165         hlist_del_rcu(&vlan->hlist);
166         if (sync)
167                 synchronize_rcu();
168 }
169 
170 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
171                                         const unsigned char *addr)
172 {
173         macvlan_hash_del(vlan, true);
174         /* Now that we are unhashed it is safe to change the device
175          * address without confusing packet delivery.
176          */
177         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
178         macvlan_hash_add(vlan);
179 }
180 
181 static int macvlan_addr_busy(const struct macvlan_port *port,
182                                 const unsigned char *addr)
183 {
184         /* Test to see if the specified multicast address is
185          * currently in use by the underlying device or
186          * another macvlan.
187          */
188         if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
189                 return 1;
190 
191         if (macvlan_hash_lookup(port, addr))
192                 return 1;
193 
194         return 0;
195 }
196 
197 
198 static int macvlan_broadcast_one(struct sk_buff *skb,
199                                  const struct macvlan_dev *vlan,
200                                  const struct ethhdr *eth, bool local)
201 {
202         struct net_device *dev = vlan->dev;
203 
204         if (local)
205                 return __dev_forward_skb(dev, skb);
206 
207         skb->dev = dev;
208         if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
209                 skb->pkt_type = PACKET_BROADCAST;
210         else
211                 skb->pkt_type = PACKET_MULTICAST;
212 
213         return 0;
214 }
215 
216 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
217 {
218         return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
219 }
220 
221 
222 static unsigned int mc_hash(const struct macvlan_dev *vlan,
223                             const unsigned char *addr)
224 {
225         u32 val = __get_unaligned_cpu32(addr + 2);
226 
227         val ^= macvlan_hash_mix(vlan);
228         return hash_32(val, MACVLAN_MC_FILTER_BITS);
229 }
230 
231 static void macvlan_broadcast(struct sk_buff *skb,
232                               const struct macvlan_port *port,
233                               struct net_device *src,
234                               enum macvlan_mode mode)
235 {
236         const struct ethhdr *eth = eth_hdr(skb);
237         const struct macvlan_dev *vlan;
238         struct sk_buff *nskb;
239         unsigned int i;
240         int err;
241         unsigned int hash;
242 
243         if (skb->protocol == htons(ETH_P_PAUSE))
244                 return;
245 
246         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
247                 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
248                         if (vlan->dev == src || !(vlan->mode & mode))
249                                 continue;
250 
251                         hash = mc_hash(vlan, eth->h_dest);
252                         if (!test_bit(hash, vlan->mc_filter))
253                                 continue;
254 
255                         err = NET_RX_DROP;
256                         nskb = skb_clone(skb, GFP_ATOMIC);
257                         if (likely(nskb))
258                                 err = macvlan_broadcast_one(
259                                         nskb, vlan, eth,
260                                         mode == MACVLAN_MODE_BRIDGE) ?:
261                                       netif_rx_ni(nskb);
262                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
263                                          err == NET_RX_SUCCESS, true);
264                 }
265         }
266 }
267 
268 static void macvlan_process_broadcast(struct work_struct *w)
269 {
270         struct macvlan_port *port = container_of(w, struct macvlan_port,
271                                                  bc_work);
272         struct sk_buff *skb;
273         struct sk_buff_head list;
274 
275         __skb_queue_head_init(&list);
276 
277         spin_lock_bh(&port->bc_queue.lock);
278         skb_queue_splice_tail_init(&port->bc_queue, &list);
279         spin_unlock_bh(&port->bc_queue.lock);
280 
281         while ((skb = __skb_dequeue(&list))) {
282                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
283 
284                 rcu_read_lock();
285 
286                 if (!src)
287                         /* frame comes from an external address */
288                         macvlan_broadcast(skb, port, NULL,
289                                           MACVLAN_MODE_PRIVATE |
290                                           MACVLAN_MODE_VEPA    |
291                                           MACVLAN_MODE_PASSTHRU|
292                                           MACVLAN_MODE_BRIDGE);
293                 else if (src->mode == MACVLAN_MODE_VEPA)
294                         /* flood to everyone except source */
295                         macvlan_broadcast(skb, port, src->dev,
296                                           MACVLAN_MODE_VEPA |
297                                           MACVLAN_MODE_BRIDGE);
298                 else
299                         /*
300                          * flood only to VEPA ports, bridge ports
301                          * already saw the frame on the way out.
302                          */
303                         macvlan_broadcast(skb, port, src->dev,
304                                           MACVLAN_MODE_VEPA);
305 
306                 rcu_read_unlock();
307 
308                 kfree_skb(skb);
309         }
310 }
311 
312 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
313                                       struct sk_buff *skb)
314 {
315         struct sk_buff *nskb;
316         int err = -ENOMEM;
317 
318         nskb = skb_clone(skb, GFP_ATOMIC);
319         if (!nskb)
320                 goto err;
321 
322         spin_lock(&port->bc_queue.lock);
323         if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
324                 __skb_queue_tail(&port->bc_queue, nskb);
325                 err = 0;
326         }
327         spin_unlock(&port->bc_queue.lock);
328 
329         if (err)
330                 goto free_nskb;
331 
332         schedule_work(&port->bc_work);
333         return;
334 
335 free_nskb:
336         kfree_skb(nskb);
337 err:
338         atomic_long_inc(&skb->dev->rx_dropped);
339 }
340 
341 static void macvlan_flush_sources(struct macvlan_port *port,
342                                   struct macvlan_dev *vlan)
343 {
344         int i;
345 
346         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
347                 struct hlist_node *h, *n;
348 
349                 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
350                         struct macvlan_source_entry *entry;
351 
352                         entry = hlist_entry(h, struct macvlan_source_entry,
353                                             hlist);
354                         if (entry->vlan == vlan)
355                                 macvlan_hash_del_source(entry);
356                 }
357         }
358         vlan->macaddr_count = 0;
359 }
360 
361 static void macvlan_forward_source_one(struct sk_buff *skb,
362                                        struct macvlan_dev *vlan)
363 {
364         struct sk_buff *nskb;
365         struct net_device *dev;
366         int len;
367         int ret;
368 
369         dev = vlan->dev;
370         if (unlikely(!(dev->flags & IFF_UP)))
371                 return;
372 
373         nskb = skb_clone(skb, GFP_ATOMIC);
374         if (!nskb)
375                 return;
376 
377         len = nskb->len + ETH_HLEN;
378         nskb->dev = dev;
379         nskb->pkt_type = PACKET_HOST;
380 
381         ret = netif_rx(nskb);
382         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
383 }
384 
385 static void macvlan_forward_source(struct sk_buff *skb,
386                                    struct macvlan_port *port,
387                                    const unsigned char *addr)
388 {
389         struct macvlan_source_entry *entry;
390         u32 idx = macvlan_eth_hash(addr);
391         struct hlist_head *h = &port->vlan_source_hash[idx];
392 
393         hlist_for_each_entry_rcu(entry, h, hlist) {
394                 if (ether_addr_equal_64bits(entry->addr, addr))
395                         if (entry->vlan->dev->flags & IFF_UP)
396                                 macvlan_forward_source_one(skb, entry->vlan);
397         }
398 }
399 
400 /* called under rcu_read_lock() from netif_receive_skb */
401 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
402 {
403         struct macvlan_port *port;
404         struct sk_buff *skb = *pskb;
405         const struct ethhdr *eth = eth_hdr(skb);
406         const struct macvlan_dev *vlan;
407         const struct macvlan_dev *src;
408         struct net_device *dev;
409         unsigned int len = 0;
410         int ret;
411         rx_handler_result_t handle_res;
412 
413         port = macvlan_port_get_rcu(skb->dev);
414         if (is_multicast_ether_addr(eth->h_dest)) {
415                 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
416                 if (!skb)
417                         return RX_HANDLER_CONSUMED;
418                 eth = eth_hdr(skb);
419                 macvlan_forward_source(skb, port, eth->h_source);
420                 src = macvlan_hash_lookup(port, eth->h_source);
421                 if (src && src->mode != MACVLAN_MODE_VEPA &&
422                     src->mode != MACVLAN_MODE_BRIDGE) {
423                         /* forward to original port. */
424                         vlan = src;
425                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
426                               netif_rx(skb);
427                         handle_res = RX_HANDLER_CONSUMED;
428                         goto out;
429                 }
430 
431                 MACVLAN_SKB_CB(skb)->src = src;
432                 macvlan_broadcast_enqueue(port, skb);
433 
434                 return RX_HANDLER_PASS;
435         }
436 
437         macvlan_forward_source(skb, port, eth->h_source);
438         if (port->passthru)
439                 vlan = list_first_or_null_rcu(&port->vlans,
440                                               struct macvlan_dev, list);
441         else
442                 vlan = macvlan_hash_lookup(port, eth->h_dest);
443         if (vlan == NULL)
444                 return RX_HANDLER_PASS;
445 
446         dev = vlan->dev;
447         if (unlikely(!(dev->flags & IFF_UP))) {
448                 kfree_skb(skb);
449                 return RX_HANDLER_CONSUMED;
450         }
451         len = skb->len + ETH_HLEN;
452         skb = skb_share_check(skb, GFP_ATOMIC);
453         if (!skb) {
454                 ret = NET_RX_DROP;
455                 handle_res = RX_HANDLER_CONSUMED;
456                 goto out;
457         }
458 
459         skb->dev = dev;
460         skb->pkt_type = PACKET_HOST;
461 
462         ret = NET_RX_SUCCESS;
463         handle_res = RX_HANDLER_ANOTHER;
464 out:
465         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
466         return handle_res;
467 }
468 
469 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
470 {
471         const struct macvlan_dev *vlan = netdev_priv(dev);
472         const struct macvlan_port *port = vlan->port;
473         const struct macvlan_dev *dest;
474 
475         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
476                 const struct ethhdr *eth = (void *)skb->data;
477 
478                 /* send to other bridge ports directly */
479                 if (is_multicast_ether_addr(eth->h_dest)) {
480                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
481                         goto xmit_world;
482                 }
483 
484                 dest = macvlan_hash_lookup(port, eth->h_dest);
485                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
486                         /* send to lowerdev first for its network taps */
487                         dev_forward_skb(vlan->lowerdev, skb);
488 
489                         return NET_XMIT_SUCCESS;
490                 }
491         }
492 
493 xmit_world:
494         skb->dev = vlan->lowerdev;
495         return dev_queue_xmit(skb);
496 }
497 
498 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
499 {
500 #ifdef CONFIG_NET_POLL_CONTROLLER
501         if (vlan->netpoll)
502                 netpoll_send_skb(vlan->netpoll, skb);
503 #else
504         BUG();
505 #endif
506         return NETDEV_TX_OK;
507 }
508 
509 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
510                                       struct net_device *dev)
511 {
512         unsigned int len = skb->len;
513         int ret;
514         struct macvlan_dev *vlan = netdev_priv(dev);
515 
516         if (unlikely(netpoll_tx_running(dev)))
517                 return macvlan_netpoll_send_skb(vlan, skb);
518 
519         if (vlan->fwd_priv) {
520                 skb->dev = vlan->lowerdev;
521                 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
522         } else {
523                 ret = macvlan_queue_xmit(skb, dev);
524         }
525 
526         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
527                 struct vlan_pcpu_stats *pcpu_stats;
528 
529                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
530                 u64_stats_update_begin(&pcpu_stats->syncp);
531                 pcpu_stats->tx_packets++;
532                 pcpu_stats->tx_bytes += len;
533                 u64_stats_update_end(&pcpu_stats->syncp);
534         } else {
535                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
536         }
537         return ret;
538 }
539 
540 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
541                                unsigned short type, const void *daddr,
542                                const void *saddr, unsigned len)
543 {
544         const struct macvlan_dev *vlan = netdev_priv(dev);
545         struct net_device *lowerdev = vlan->lowerdev;
546 
547         return dev_hard_header(skb, lowerdev, type, daddr,
548                                saddr ? : dev->dev_addr, len);
549 }
550 
551 static const struct header_ops macvlan_hard_header_ops = {
552         .create         = macvlan_hard_header,
553         .parse          = eth_header_parse,
554         .cache          = eth_header_cache,
555         .cache_update   = eth_header_cache_update,
556 };
557 
558 static struct rtnl_link_ops macvlan_link_ops;
559 
560 static int macvlan_open(struct net_device *dev)
561 {
562         struct macvlan_dev *vlan = netdev_priv(dev);
563         struct net_device *lowerdev = vlan->lowerdev;
564         int err;
565 
566         if (vlan->port->passthru) {
567                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
568                         err = dev_set_promiscuity(lowerdev, 1);
569                         if (err < 0)
570                                 goto out;
571                 }
572                 goto hash_add;
573         }
574 
575         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
576             dev->rtnl_link_ops == &macvlan_link_ops) {
577                 vlan->fwd_priv =
578                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
579 
580                 /* If we get a NULL pointer back, or if we get an error
581                  * then we should just fall through to the non accelerated path
582                  */
583                 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
584                         vlan->fwd_priv = NULL;
585                 } else
586                         return 0;
587         }
588 
589         err = -EBUSY;
590         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
591                 goto out;
592 
593         err = dev_uc_add(lowerdev, dev->dev_addr);
594         if (err < 0)
595                 goto out;
596         if (dev->flags & IFF_ALLMULTI) {
597                 err = dev_set_allmulti(lowerdev, 1);
598                 if (err < 0)
599                         goto del_unicast;
600         }
601 
602         if (dev->flags & IFF_PROMISC) {
603                 err = dev_set_promiscuity(lowerdev, 1);
604                 if (err < 0)
605                         goto clear_multi;
606         }
607 
608 hash_add:
609         macvlan_hash_add(vlan);
610         return 0;
611 
612 clear_multi:
613         dev_set_allmulti(lowerdev, -1);
614 del_unicast:
615         dev_uc_del(lowerdev, dev->dev_addr);
616 out:
617         if (vlan->fwd_priv) {
618                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
619                                                            vlan->fwd_priv);
620                 vlan->fwd_priv = NULL;
621         }
622         return err;
623 }
624 
625 static int macvlan_stop(struct net_device *dev)
626 {
627         struct macvlan_dev *vlan = netdev_priv(dev);
628         struct net_device *lowerdev = vlan->lowerdev;
629 
630         if (vlan->fwd_priv) {
631                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
632                                                            vlan->fwd_priv);
633                 vlan->fwd_priv = NULL;
634                 return 0;
635         }
636 
637         dev_uc_unsync(lowerdev, dev);
638         dev_mc_unsync(lowerdev, dev);
639 
640         if (vlan->port->passthru) {
641                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
642                         dev_set_promiscuity(lowerdev, -1);
643                 goto hash_del;
644         }
645 
646         if (dev->flags & IFF_ALLMULTI)
647                 dev_set_allmulti(lowerdev, -1);
648 
649         if (dev->flags & IFF_PROMISC)
650                 dev_set_promiscuity(lowerdev, -1);
651 
652         dev_uc_del(lowerdev, dev->dev_addr);
653 
654 hash_del:
655         macvlan_hash_del(vlan, !dev->dismantle);
656         return 0;
657 }
658 
659 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
660 {
661         struct macvlan_dev *vlan = netdev_priv(dev);
662         struct net_device *lowerdev = vlan->lowerdev;
663         int err;
664 
665         if (!(dev->flags & IFF_UP)) {
666                 /* Just copy in the new address */
667                 ether_addr_copy(dev->dev_addr, addr);
668         } else {
669                 /* Rehash and update the device filters */
670                 if (macvlan_addr_busy(vlan->port, addr))
671                         return -EBUSY;
672 
673                 if (!vlan->port->passthru) {
674                         err = dev_uc_add(lowerdev, addr);
675                         if (err)
676                                 return err;
677 
678                         dev_uc_del(lowerdev, dev->dev_addr);
679                 }
680 
681                 macvlan_hash_change_addr(vlan, addr);
682         }
683         return 0;
684 }
685 
686 static int macvlan_set_mac_address(struct net_device *dev, void *p)
687 {
688         struct macvlan_dev *vlan = netdev_priv(dev);
689         struct sockaddr *addr = p;
690 
691         if (!is_valid_ether_addr(addr->sa_data))
692                 return -EADDRNOTAVAIL;
693 
694         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
695                 dev_set_mac_address(vlan->lowerdev, addr);
696                 return 0;
697         }
698 
699         return macvlan_sync_address(dev, addr->sa_data);
700 }
701 
702 static void macvlan_change_rx_flags(struct net_device *dev, int change)
703 {
704         struct macvlan_dev *vlan = netdev_priv(dev);
705         struct net_device *lowerdev = vlan->lowerdev;
706 
707         if (dev->flags & IFF_UP) {
708                 if (change & IFF_ALLMULTI)
709                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
710                 if (change & IFF_PROMISC)
711                         dev_set_promiscuity(lowerdev,
712                                             dev->flags & IFF_PROMISC ? 1 : -1);
713 
714         }
715 }
716 
717 static void macvlan_set_mac_lists(struct net_device *dev)
718 {
719         struct macvlan_dev *vlan = netdev_priv(dev);
720 
721         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
722                 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
723         } else {
724                 struct netdev_hw_addr *ha;
725                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
726 
727                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
728                 netdev_for_each_mc_addr(ha, dev) {
729                         __set_bit(mc_hash(vlan, ha->addr), filter);
730                 }
731 
732                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
733 
734                 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
735         }
736         dev_uc_sync(vlan->lowerdev, dev);
737         dev_mc_sync(vlan->lowerdev, dev);
738 }
739 
740 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
741 {
742         struct macvlan_dev *vlan = netdev_priv(dev);
743 
744         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
745                 return -EINVAL;
746         dev->mtu = new_mtu;
747         return 0;
748 }
749 
750 /*
751  * macvlan network devices have devices nesting below it and are a special
752  * "super class" of normal network devices; split their locks off into a
753  * separate class since they always nest.
754  */
755 static struct lock_class_key macvlan_netdev_xmit_lock_key;
756 static struct lock_class_key macvlan_netdev_addr_lock_key;
757 
758 #define ALWAYS_ON_FEATURES \
759         (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \
760          NETIF_F_GSO_ROBUST)
761 
762 #define MACVLAN_FEATURES \
763         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
764          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \
765          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
766          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
767 
768 #define MACVLAN_STATE_MASK \
769         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
770 
771 static int macvlan_get_nest_level(struct net_device *dev)
772 {
773         return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
774 }
775 
776 static void macvlan_set_lockdep_class_one(struct net_device *dev,
777                                           struct netdev_queue *txq,
778                                           void *_unused)
779 {
780         lockdep_set_class(&txq->_xmit_lock,
781                           &macvlan_netdev_xmit_lock_key);
782 }
783 
784 static void macvlan_set_lockdep_class(struct net_device *dev)
785 {
786         lockdep_set_class_and_subclass(&dev->addr_list_lock,
787                                        &macvlan_netdev_addr_lock_key,
788                                        macvlan_get_nest_level(dev));
789         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
790 }
791 
792 static int macvlan_init(struct net_device *dev)
793 {
794         struct macvlan_dev *vlan = netdev_priv(dev);
795         const struct net_device *lowerdev = vlan->lowerdev;
796 
797         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
798                                   (lowerdev->state & MACVLAN_STATE_MASK);
799         dev->features           = lowerdev->features & MACVLAN_FEATURES;
800         dev->features           |= ALWAYS_ON_FEATURES;
801         dev->hw_features        |= NETIF_F_LRO;
802         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
803         dev->gso_max_size       = lowerdev->gso_max_size;
804         dev->hard_header_len    = lowerdev->hard_header_len;
805 
806         macvlan_set_lockdep_class(dev);
807 
808         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
809         if (!vlan->pcpu_stats)
810                 return -ENOMEM;
811 
812         return 0;
813 }
814 
815 static void macvlan_uninit(struct net_device *dev)
816 {
817         struct macvlan_dev *vlan = netdev_priv(dev);
818         struct macvlan_port *port = vlan->port;
819 
820         free_percpu(vlan->pcpu_stats);
821 
822         macvlan_flush_sources(port, vlan);
823         port->count -= 1;
824         if (!port->count)
825                 macvlan_port_destroy(port->dev);
826 }
827 
828 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
829                                                          struct rtnl_link_stats64 *stats)
830 {
831         struct macvlan_dev *vlan = netdev_priv(dev);
832 
833         if (vlan->pcpu_stats) {
834                 struct vlan_pcpu_stats *p;
835                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
836                 u32 rx_errors = 0, tx_dropped = 0;
837                 unsigned int start;
838                 int i;
839 
840                 for_each_possible_cpu(i) {
841                         p = per_cpu_ptr(vlan->pcpu_stats, i);
842                         do {
843                                 start = u64_stats_fetch_begin_irq(&p->syncp);
844                                 rx_packets      = p->rx_packets;
845                                 rx_bytes        = p->rx_bytes;
846                                 rx_multicast    = p->rx_multicast;
847                                 tx_packets      = p->tx_packets;
848                                 tx_bytes        = p->tx_bytes;
849                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
850 
851                         stats->rx_packets       += rx_packets;
852                         stats->rx_bytes         += rx_bytes;
853                         stats->multicast        += rx_multicast;
854                         stats->tx_packets       += tx_packets;
855                         stats->tx_bytes         += tx_bytes;
856                         /* rx_errors & tx_dropped are u32, updated
857                          * without syncp protection.
858                          */
859                         rx_errors       += p->rx_errors;
860                         tx_dropped      += p->tx_dropped;
861                 }
862                 stats->rx_errors        = rx_errors;
863                 stats->rx_dropped       = rx_errors;
864                 stats->tx_dropped       = tx_dropped;
865         }
866         return stats;
867 }
868 
869 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
870                                    __be16 proto, u16 vid)
871 {
872         struct macvlan_dev *vlan = netdev_priv(dev);
873         struct net_device *lowerdev = vlan->lowerdev;
874 
875         return vlan_vid_add(lowerdev, proto, vid);
876 }
877 
878 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
879                                     __be16 proto, u16 vid)
880 {
881         struct macvlan_dev *vlan = netdev_priv(dev);
882         struct net_device *lowerdev = vlan->lowerdev;
883 
884         vlan_vid_del(lowerdev, proto, vid);
885         return 0;
886 }
887 
888 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
889                            struct net_device *dev,
890                            const unsigned char *addr, u16 vid,
891                            u16 flags)
892 {
893         struct macvlan_dev *vlan = netdev_priv(dev);
894         int err = -EINVAL;
895 
896         /* Support unicast filter only on passthru devices.
897          * Multicast filter should be allowed on all devices.
898          */
899         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
900                 return -EOPNOTSUPP;
901 
902         if (flags & NLM_F_REPLACE)
903                 return -EOPNOTSUPP;
904 
905         if (is_unicast_ether_addr(addr))
906                 err = dev_uc_add_excl(dev, addr);
907         else if (is_multicast_ether_addr(addr))
908                 err = dev_mc_add_excl(dev, addr);
909 
910         return err;
911 }
912 
913 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
914                            struct net_device *dev,
915                            const unsigned char *addr, u16 vid)
916 {
917         struct macvlan_dev *vlan = netdev_priv(dev);
918         int err = -EINVAL;
919 
920         /* Support unicast filter only on passthru devices.
921          * Multicast filter should be allowed on all devices.
922          */
923         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
924                 return -EOPNOTSUPP;
925 
926         if (is_unicast_ether_addr(addr))
927                 err = dev_uc_del(dev, addr);
928         else if (is_multicast_ether_addr(addr))
929                 err = dev_mc_del(dev, addr);
930 
931         return err;
932 }
933 
934 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
935                                         struct ethtool_drvinfo *drvinfo)
936 {
937         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
938         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
939 }
940 
941 static int macvlan_ethtool_get_settings(struct net_device *dev,
942                                         struct ethtool_cmd *cmd)
943 {
944         const struct macvlan_dev *vlan = netdev_priv(dev);
945 
946         return __ethtool_get_settings(vlan->lowerdev, cmd);
947 }
948 
949 static netdev_features_t macvlan_fix_features(struct net_device *dev,
950                                               netdev_features_t features)
951 {
952         struct macvlan_dev *vlan = netdev_priv(dev);
953         netdev_features_t lowerdev_features = vlan->lowerdev->features;
954         netdev_features_t mask;
955 
956         features |= NETIF_F_ALL_FOR_ALL;
957         features &= (vlan->set_features | ~MACVLAN_FEATURES);
958         mask = features;
959 
960         lowerdev_features &= (features | ~NETIF_F_LRO);
961         features = netdev_increment_features(lowerdev_features, features, mask);
962         features |= ALWAYS_ON_FEATURES;
963         features &= ~NETIF_F_NETNS_LOCAL;
964 
965         return features;
966 }
967 
968 #ifdef CONFIG_NET_POLL_CONTROLLER
969 static void macvlan_dev_poll_controller(struct net_device *dev)
970 {
971         return;
972 }
973 
974 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
975 {
976         struct macvlan_dev *vlan = netdev_priv(dev);
977         struct net_device *real_dev = vlan->lowerdev;
978         struct netpoll *netpoll;
979         int err = 0;
980 
981         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
982         err = -ENOMEM;
983         if (!netpoll)
984                 goto out;
985 
986         err = __netpoll_setup(netpoll, real_dev);
987         if (err) {
988                 kfree(netpoll);
989                 goto out;
990         }
991 
992         vlan->netpoll = netpoll;
993 
994 out:
995         return err;
996 }
997 
998 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
999 {
1000         struct macvlan_dev *vlan = netdev_priv(dev);
1001         struct netpoll *netpoll = vlan->netpoll;
1002 
1003         if (!netpoll)
1004                 return;
1005 
1006         vlan->netpoll = NULL;
1007 
1008         __netpoll_free_async(netpoll);
1009 }
1010 #endif  /* CONFIG_NET_POLL_CONTROLLER */
1011 
1012 static int macvlan_dev_get_iflink(const struct net_device *dev)
1013 {
1014         struct macvlan_dev *vlan = netdev_priv(dev);
1015 
1016         return vlan->lowerdev->ifindex;
1017 }
1018 
1019 static const struct ethtool_ops macvlan_ethtool_ops = {
1020         .get_link               = ethtool_op_get_link,
1021         .get_settings           = macvlan_ethtool_get_settings,
1022         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1023 };
1024 
1025 static const struct net_device_ops macvlan_netdev_ops = {
1026         .ndo_init               = macvlan_init,
1027         .ndo_uninit             = macvlan_uninit,
1028         .ndo_open               = macvlan_open,
1029         .ndo_stop               = macvlan_stop,
1030         .ndo_start_xmit         = macvlan_start_xmit,
1031         .ndo_change_mtu         = macvlan_change_mtu,
1032         .ndo_fix_features       = macvlan_fix_features,
1033         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1034         .ndo_set_mac_address    = macvlan_set_mac_address,
1035         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1036         .ndo_get_stats64        = macvlan_dev_get_stats64,
1037         .ndo_validate_addr      = eth_validate_addr,
1038         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1039         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1040         .ndo_fdb_add            = macvlan_fdb_add,
1041         .ndo_fdb_del            = macvlan_fdb_del,
1042         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1043         .ndo_get_lock_subclass  = macvlan_get_nest_level,
1044 #ifdef CONFIG_NET_POLL_CONTROLLER
1045         .ndo_poll_controller    = macvlan_dev_poll_controller,
1046         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1047         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1048 #endif
1049         .ndo_get_iflink         = macvlan_dev_get_iflink,
1050 };
1051 
1052 void macvlan_common_setup(struct net_device *dev)
1053 {
1054         ether_setup(dev);
1055 
1056         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1057         netif_keep_dst(dev);
1058         dev->priv_flags        |= IFF_UNICAST_FLT;
1059         dev->netdev_ops         = &macvlan_netdev_ops;
1060         dev->destructor         = free_netdev;
1061         dev->header_ops         = &macvlan_hard_header_ops;
1062         dev->ethtool_ops        = &macvlan_ethtool_ops;
1063 }
1064 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1065 
1066 static void macvlan_setup(struct net_device *dev)
1067 {
1068         macvlan_common_setup(dev);
1069         dev->tx_queue_len       = 0;
1070 }
1071 
1072 static int macvlan_port_create(struct net_device *dev)
1073 {
1074         struct macvlan_port *port;
1075         unsigned int i;
1076         int err;
1077 
1078         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1079                 return -EINVAL;
1080 
1081         if (netif_is_ipvlan_port(dev))
1082                 return -EBUSY;
1083 
1084         port = kzalloc(sizeof(*port), GFP_KERNEL);
1085         if (port == NULL)
1086                 return -ENOMEM;
1087 
1088         port->passthru = false;
1089         port->dev = dev;
1090         INIT_LIST_HEAD(&port->vlans);
1091         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1092                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1093         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1094                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1095 
1096         skb_queue_head_init(&port->bc_queue);
1097         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1098 
1099         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1100         if (err)
1101                 kfree(port);
1102         else
1103                 dev->priv_flags |= IFF_MACVLAN_PORT;
1104         return err;
1105 }
1106 
1107 static void macvlan_port_destroy(struct net_device *dev)
1108 {
1109         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1110 
1111         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1112         netdev_rx_handler_unregister(dev);
1113 
1114         /* After this point, no packet can schedule bc_work anymore,
1115          * but we need to cancel it and purge left skbs if any.
1116          */
1117         cancel_work_sync(&port->bc_work);
1118         __skb_queue_purge(&port->bc_queue);
1119 
1120         kfree_rcu(port, rcu);
1121 }
1122 
1123 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1124 {
1125         if (tb[IFLA_ADDRESS]) {
1126                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1127                         return -EINVAL;
1128                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1129                         return -EADDRNOTAVAIL;
1130         }
1131 
1132         if (data && data[IFLA_MACVLAN_FLAGS] &&
1133             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1134                 return -EINVAL;
1135 
1136         if (data && data[IFLA_MACVLAN_MODE]) {
1137                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1138                 case MACVLAN_MODE_PRIVATE:
1139                 case MACVLAN_MODE_VEPA:
1140                 case MACVLAN_MODE_BRIDGE:
1141                 case MACVLAN_MODE_PASSTHRU:
1142                 case MACVLAN_MODE_SOURCE:
1143                         break;
1144                 default:
1145                         return -EINVAL;
1146                 }
1147         }
1148 
1149         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1150                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1151                 case MACVLAN_MACADDR_ADD:
1152                 case MACVLAN_MACADDR_DEL:
1153                 case MACVLAN_MACADDR_FLUSH:
1154                 case MACVLAN_MACADDR_SET:
1155                         break;
1156                 default:
1157                         return -EINVAL;
1158                 }
1159         }
1160 
1161         if (data && data[IFLA_MACVLAN_MACADDR]) {
1162                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1163                         return -EINVAL;
1164 
1165                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1166                         return -EADDRNOTAVAIL;
1167         }
1168 
1169         if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1170                 return -EINVAL;
1171 
1172         return 0;
1173 }
1174 
1175 /**
1176  * reconfigure list of remote source mac address
1177  * (only for macvlan devices in source mode)
1178  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1179  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1180  */
1181 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1182                                       struct nlattr *data[])
1183 {
1184         char *addr = NULL;
1185         int ret, rem, len;
1186         struct nlattr *nla, *head;
1187         struct macvlan_source_entry *entry;
1188 
1189         if (data[IFLA_MACVLAN_MACADDR])
1190                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1191 
1192         if (mode == MACVLAN_MACADDR_ADD) {
1193                 if (!addr)
1194                         return -EINVAL;
1195 
1196                 return macvlan_hash_add_source(vlan, addr);
1197 
1198         } else if (mode == MACVLAN_MACADDR_DEL) {
1199                 if (!addr)
1200                         return -EINVAL;
1201 
1202                 entry = macvlan_hash_lookup_source(vlan, addr);
1203                 if (entry) {
1204                         macvlan_hash_del_source(entry);
1205                         vlan->macaddr_count--;
1206                 }
1207         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1208                 macvlan_flush_sources(vlan->port, vlan);
1209         } else if (mode == MACVLAN_MACADDR_SET) {
1210                 macvlan_flush_sources(vlan->port, vlan);
1211 
1212                 if (addr) {
1213                         ret = macvlan_hash_add_source(vlan, addr);
1214                         if (ret)
1215                                 return ret;
1216                 }
1217 
1218                 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1219                         return 0;
1220 
1221                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1222                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1223 
1224                 nla_for_each_attr(nla, head, len, rem) {
1225                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1226                             nla_len(nla) != ETH_ALEN)
1227                                 continue;
1228 
1229                         addr = nla_data(nla);
1230                         ret = macvlan_hash_add_source(vlan, addr);
1231                         if (ret)
1232                                 return ret;
1233                 }
1234         } else {
1235                 return -EINVAL;
1236         }
1237 
1238         return 0;
1239 }
1240 
1241 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1242                            struct nlattr *tb[], struct nlattr *data[])
1243 {
1244         struct macvlan_dev *vlan = netdev_priv(dev);
1245         struct macvlan_port *port;
1246         struct net_device *lowerdev;
1247         int err;
1248         int macmode;
1249 
1250         if (!tb[IFLA_LINK])
1251                 return -EINVAL;
1252 
1253         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1254         if (lowerdev == NULL)
1255                 return -ENODEV;
1256 
1257         /* When creating macvlans or macvtaps on top of other macvlans - use
1258          * the real device as the lowerdev.
1259          */
1260         if (netif_is_macvlan(lowerdev))
1261                 lowerdev = macvlan_dev_real_dev(lowerdev);
1262 
1263         if (!tb[IFLA_MTU])
1264                 dev->mtu = lowerdev->mtu;
1265         else if (dev->mtu > lowerdev->mtu)
1266                 return -EINVAL;
1267 
1268         if (!tb[IFLA_ADDRESS])
1269                 eth_hw_addr_random(dev);
1270 
1271         if (!macvlan_port_exists(lowerdev)) {
1272                 err = macvlan_port_create(lowerdev);
1273                 if (err < 0)
1274                         return err;
1275         }
1276         port = macvlan_port_get_rtnl(lowerdev);
1277 
1278         /* Only 1 macvlan device can be created in passthru mode */
1279         if (port->passthru)
1280                 return -EINVAL;
1281 
1282         vlan->lowerdev = lowerdev;
1283         vlan->dev      = dev;
1284         vlan->port     = port;
1285         vlan->set_features = MACVLAN_FEATURES;
1286         vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1287 
1288         vlan->mode     = MACVLAN_MODE_VEPA;
1289         if (data && data[IFLA_MACVLAN_MODE])
1290                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1291 
1292         if (data && data[IFLA_MACVLAN_FLAGS])
1293                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1294 
1295         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1296                 if (port->count)
1297                         return -EINVAL;
1298                 port->passthru = true;
1299                 eth_hw_addr_inherit(dev, lowerdev);
1300         }
1301 
1302         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1303                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1304                         return -EINVAL;
1305                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1306                 err = macvlan_changelink_sources(vlan, macmode, data);
1307                 if (err)
1308                         return err;
1309         }
1310 
1311         port->count += 1;
1312         err = register_netdevice(dev);
1313         if (err < 0)
1314                 goto destroy_port;
1315 
1316         dev->priv_flags |= IFF_MACVLAN;
1317         err = netdev_upper_dev_link(lowerdev, dev);
1318         if (err)
1319                 goto unregister_netdev;
1320 
1321         list_add_tail_rcu(&vlan->list, &port->vlans);
1322         netif_stacked_transfer_operstate(lowerdev, dev);
1323 
1324         return 0;
1325 
1326 unregister_netdev:
1327         unregister_netdevice(dev);
1328 destroy_port:
1329         port->count -= 1;
1330         if (!port->count)
1331                 macvlan_port_destroy(lowerdev);
1332 
1333         return err;
1334 }
1335 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1336 
1337 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1338                            struct nlattr *tb[], struct nlattr *data[])
1339 {
1340         return macvlan_common_newlink(src_net, dev, tb, data);
1341 }
1342 
1343 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1344 {
1345         struct macvlan_dev *vlan = netdev_priv(dev);
1346 
1347         if (vlan->mode == MACVLAN_MODE_SOURCE)
1348                 macvlan_flush_sources(vlan->port, vlan);
1349         list_del_rcu(&vlan->list);
1350         unregister_netdevice_queue(dev, head);
1351         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1352 }
1353 EXPORT_SYMBOL_GPL(macvlan_dellink);
1354 
1355 static int macvlan_changelink(struct net_device *dev,
1356                 struct nlattr *tb[], struct nlattr *data[])
1357 {
1358         struct macvlan_dev *vlan = netdev_priv(dev);
1359         enum macvlan_mode mode;
1360         bool set_mode = false;
1361         enum macvlan_macaddr_mode macmode;
1362         int ret;
1363 
1364         /* Validate mode, but don't set yet: setting flags may fail. */
1365         if (data && data[IFLA_MACVLAN_MODE]) {
1366                 set_mode = true;
1367                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1368                 /* Passthrough mode can't be set or cleared dynamically */
1369                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1370                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1371                         return -EINVAL;
1372                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1373                     vlan->mode != mode)
1374                         macvlan_flush_sources(vlan->port, vlan);
1375         }
1376 
1377         if (data && data[IFLA_MACVLAN_FLAGS]) {
1378                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1379                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1380                 if (vlan->port->passthru && promisc) {
1381                         int err;
1382 
1383                         if (flags & MACVLAN_FLAG_NOPROMISC)
1384                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1385                         else
1386                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1387                         if (err < 0)
1388                                 return err;
1389                 }
1390                 vlan->flags = flags;
1391         }
1392         if (set_mode)
1393                 vlan->mode = mode;
1394         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1395                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1396                         return -EINVAL;
1397                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1398                 ret = macvlan_changelink_sources(vlan, macmode, data);
1399                 if (ret)
1400                         return ret;
1401         }
1402         return 0;
1403 }
1404 
1405 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1406 {
1407         if (vlan->macaddr_count == 0)
1408                 return 0;
1409         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1410                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1411 }
1412 
1413 static size_t macvlan_get_size(const struct net_device *dev)
1414 {
1415         struct macvlan_dev *vlan = netdev_priv(dev);
1416 
1417         return (0
1418                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1419                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1420                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1421                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1422                 );
1423 }
1424 
1425 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1426                                      const struct macvlan_dev *vlan,
1427                                      const int i)
1428 {
1429         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1430         struct macvlan_source_entry *entry;
1431 
1432         hlist_for_each_entry_rcu(entry, h, hlist) {
1433                 if (entry->vlan != vlan)
1434                         continue;
1435                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1436                         return 1;
1437         }
1438         return 0;
1439 }
1440 
1441 static int macvlan_fill_info(struct sk_buff *skb,
1442                                 const struct net_device *dev)
1443 {
1444         struct macvlan_dev *vlan = netdev_priv(dev);
1445         int i;
1446         struct nlattr *nest;
1447 
1448         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1449                 goto nla_put_failure;
1450         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1451                 goto nla_put_failure;
1452         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1453                 goto nla_put_failure;
1454         if (vlan->macaddr_count > 0) {
1455                 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1456                 if (nest == NULL)
1457                         goto nla_put_failure;
1458 
1459                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1460                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1461                                 goto nla_put_failure;
1462                 }
1463                 nla_nest_end(skb, nest);
1464         }
1465         return 0;
1466 
1467 nla_put_failure:
1468         return -EMSGSIZE;
1469 }
1470 
1471 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1472         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1473         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1474         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1475         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1476         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1477         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1478 };
1479 
1480 int macvlan_link_register(struct rtnl_link_ops *ops)
1481 {
1482         /* common fields */
1483         ops->priv_size          = sizeof(struct macvlan_dev);
1484         ops->validate           = macvlan_validate;
1485         ops->maxtype            = IFLA_MACVLAN_MAX;
1486         ops->policy             = macvlan_policy;
1487         ops->changelink         = macvlan_changelink;
1488         ops->get_size           = macvlan_get_size;
1489         ops->fill_info          = macvlan_fill_info;
1490 
1491         return rtnl_link_register(ops);
1492 };
1493 EXPORT_SYMBOL_GPL(macvlan_link_register);
1494 
1495 static struct net *macvlan_get_link_net(const struct net_device *dev)
1496 {
1497         return dev_net(macvlan_dev_real_dev(dev));
1498 }
1499 
1500 static struct rtnl_link_ops macvlan_link_ops = {
1501         .kind           = "macvlan",
1502         .setup          = macvlan_setup,
1503         .newlink        = macvlan_newlink,
1504         .dellink        = macvlan_dellink,
1505         .get_link_net   = macvlan_get_link_net,
1506 };
1507 
1508 static int macvlan_device_event(struct notifier_block *unused,
1509                                 unsigned long event, void *ptr)
1510 {
1511         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1512         struct macvlan_dev *vlan, *next;
1513         struct macvlan_port *port;
1514         LIST_HEAD(list_kill);
1515 
1516         if (!macvlan_port_exists(dev))
1517                 return NOTIFY_DONE;
1518 
1519         port = macvlan_port_get_rtnl(dev);
1520 
1521         switch (event) {
1522         case NETDEV_CHANGE:
1523                 list_for_each_entry(vlan, &port->vlans, list)
1524                         netif_stacked_transfer_operstate(vlan->lowerdev,
1525                                                          vlan->dev);
1526                 break;
1527         case NETDEV_FEAT_CHANGE:
1528                 list_for_each_entry(vlan, &port->vlans, list) {
1529                         vlan->dev->gso_max_size = dev->gso_max_size;
1530                         netdev_update_features(vlan->dev);
1531                 }
1532                 break;
1533         case NETDEV_CHANGEMTU:
1534                 list_for_each_entry(vlan, &port->vlans, list) {
1535                         if (vlan->dev->mtu <= dev->mtu)
1536                                 continue;
1537                         dev_set_mtu(vlan->dev, dev->mtu);
1538                 }
1539                 break;
1540         case NETDEV_CHANGEADDR:
1541                 if (!port->passthru)
1542                         return NOTIFY_DONE;
1543 
1544                 vlan = list_first_entry_or_null(&port->vlans,
1545                                                 struct macvlan_dev,
1546                                                 list);
1547 
1548                 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1549                         return NOTIFY_BAD;
1550 
1551                 break;
1552         case NETDEV_UNREGISTER:
1553                 /* twiddle thumbs on netns device moves */
1554                 if (dev->reg_state != NETREG_UNREGISTERING)
1555                         break;
1556 
1557                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1558                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1559                 unregister_netdevice_many(&list_kill);
1560                 break;
1561         case NETDEV_PRE_TYPE_CHANGE:
1562                 /* Forbid underlaying device to change its type. */
1563                 return NOTIFY_BAD;
1564 
1565         case NETDEV_NOTIFY_PEERS:
1566         case NETDEV_BONDING_FAILOVER:
1567         case NETDEV_RESEND_IGMP:
1568                 /* Propagate to all vlans */
1569                 list_for_each_entry(vlan, &port->vlans, list)
1570                         call_netdevice_notifiers(event, vlan->dev);
1571         }
1572         return NOTIFY_DONE;
1573 }
1574 
1575 static struct notifier_block macvlan_notifier_block __read_mostly = {
1576         .notifier_call  = macvlan_device_event,
1577 };
1578 
1579 static int __init macvlan_init_module(void)
1580 {
1581         int err;
1582 
1583         register_netdevice_notifier(&macvlan_notifier_block);
1584 
1585         err = macvlan_link_register(&macvlan_link_ops);
1586         if (err < 0)
1587                 goto err1;
1588         return 0;
1589 err1:
1590         unregister_netdevice_notifier(&macvlan_notifier_block);
1591         return err;
1592 }
1593 
1594 static void __exit macvlan_cleanup_module(void)
1595 {
1596         rtnl_link_unregister(&macvlan_link_ops);
1597         unregister_netdevice_notifier(&macvlan_notifier_block);
1598 }
1599 
1600 module_init(macvlan_init_module);
1601 module_exit(macvlan_cleanup_module);
1602 
1603 MODULE_LICENSE("GPL");
1604 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1605 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1606 MODULE_ALIAS_RTNL_LINK("macvlan");
1607 

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