Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

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         DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
 53 };
 54 
 55 struct macvlan_source_entry {
 56         struct hlist_node       hlist;
 57         struct macvlan_dev      *vlan;
 58         unsigned char           addr[6+2] __aligned(sizeof(u16));
 59         struct rcu_head         rcu;
 60 };
 61 
 62 struct macvlan_skb_cb {
 63         const struct macvlan_dev *src;
 64 };
 65 
 66 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
 67 
 68 static void macvlan_port_destroy(struct net_device *dev);
 69 
 70 /* Hash Ethernet address */
 71 static u32 macvlan_eth_hash(const unsigned char *addr)
 72 {
 73         u64 value = get_unaligned((u64 *)addr);
 74 
 75         /* only want 6 bytes */
 76 #ifdef __BIG_ENDIAN
 77         value >>= 16;
 78 #else
 79         value <<= 16;
 80 #endif
 81         return hash_64(value, MACVLAN_HASH_BITS);
 82 }
 83 
 84 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
 85 {
 86         return rcu_dereference(dev->rx_handler_data);
 87 }
 88 
 89 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
 90 {
 91         return rtnl_dereference(dev->rx_handler_data);
 92 }
 93 
 94 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
 95 
 96 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
 97                                                const unsigned char *addr)
 98 {
 99         struct macvlan_dev *vlan;
100         u32 idx = macvlan_eth_hash(addr);
101 
102         hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) {
103                 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
104                         return vlan;
105         }
106         return NULL;
107 }
108 
109 static struct macvlan_source_entry *macvlan_hash_lookup_source(
110         const struct macvlan_dev *vlan,
111         const unsigned char *addr)
112 {
113         struct macvlan_source_entry *entry;
114         u32 idx = macvlan_eth_hash(addr);
115         struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
116 
117         hlist_for_each_entry_rcu(entry, h, hlist) {
118                 if (ether_addr_equal_64bits(entry->addr, addr) &&
119                     entry->vlan == vlan)
120                         return entry;
121         }
122         return NULL;
123 }
124 
125 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
126                                    const unsigned char *addr)
127 {
128         struct macvlan_port *port = vlan->port;
129         struct macvlan_source_entry *entry;
130         struct hlist_head *h;
131 
132         entry = macvlan_hash_lookup_source(vlan, addr);
133         if (entry)
134                 return 0;
135 
136         entry = kmalloc(sizeof(*entry), GFP_KERNEL);
137         if (!entry)
138                 return -ENOMEM;
139 
140         ether_addr_copy(entry->addr, addr);
141         entry->vlan = vlan;
142         h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
143         hlist_add_head_rcu(&entry->hlist, h);
144         vlan->macaddr_count++;
145 
146         return 0;
147 }
148 
149 static void macvlan_hash_add(struct macvlan_dev *vlan)
150 {
151         struct macvlan_port *port = vlan->port;
152         const unsigned char *addr = vlan->dev->dev_addr;
153         u32 idx = macvlan_eth_hash(addr);
154 
155         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
156 }
157 
158 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
159 {
160         hlist_del_rcu(&entry->hlist);
161         kfree_rcu(entry, rcu);
162 }
163 
164 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
165 {
166         hlist_del_rcu(&vlan->hlist);
167         if (sync)
168                 synchronize_rcu();
169 }
170 
171 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
172                                         const unsigned char *addr)
173 {
174         macvlan_hash_del(vlan, true);
175         /* Now that we are unhashed it is safe to change the device
176          * address without confusing packet delivery.
177          */
178         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
179         macvlan_hash_add(vlan);
180 }
181 
182 static int macvlan_addr_busy(const struct macvlan_port *port,
183                                 const unsigned char *addr)
184 {
185         /* Test to see if the specified multicast address is
186          * currently in use by the underlying device or
187          * another macvlan.
188          */
189         if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
190                 return 1;
191 
192         if (macvlan_hash_lookup(port, addr))
193                 return 1;
194 
195         return 0;
196 }
197 
198 
199 static int macvlan_broadcast_one(struct sk_buff *skb,
200                                  const struct macvlan_dev *vlan,
201                                  const struct ethhdr *eth, bool local)
202 {
203         struct net_device *dev = vlan->dev;
204 
205         if (local)
206                 return __dev_forward_skb(dev, skb);
207 
208         skb->dev = dev;
209         if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
210                 skb->pkt_type = PACKET_BROADCAST;
211         else
212                 skb->pkt_type = PACKET_MULTICAST;
213 
214         return 0;
215 }
216 
217 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
218 {
219         return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
220 }
221 
222 
223 static unsigned int mc_hash(const struct macvlan_dev *vlan,
224                             const unsigned char *addr)
225 {
226         u32 val = __get_unaligned_cpu32(addr + 2);
227 
228         val ^= macvlan_hash_mix(vlan);
229         return hash_32(val, MACVLAN_MC_FILTER_BITS);
230 }
231 
232 static void macvlan_broadcast(struct sk_buff *skb,
233                               const struct macvlan_port *port,
234                               struct net_device *src,
235                               enum macvlan_mode mode)
236 {
237         const struct ethhdr *eth = eth_hdr(skb);
238         const struct macvlan_dev *vlan;
239         struct sk_buff *nskb;
240         unsigned int i;
241         int err;
242         unsigned int hash;
243 
244         if (skb->protocol == htons(ETH_P_PAUSE))
245                 return;
246 
247         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
248                 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
249                         if (vlan->dev == src || !(vlan->mode & mode))
250                                 continue;
251 
252                         hash = mc_hash(vlan, eth->h_dest);
253                         if (!test_bit(hash, vlan->mc_filter))
254                                 continue;
255 
256                         err = NET_RX_DROP;
257                         nskb = skb_clone(skb, GFP_ATOMIC);
258                         if (likely(nskb))
259                                 err = macvlan_broadcast_one(
260                                         nskb, vlan, eth,
261                                         mode == MACVLAN_MODE_BRIDGE) ?:
262                                       netif_rx_ni(nskb);
263                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
264                                          err == NET_RX_SUCCESS, true);
265                 }
266         }
267 }
268 
269 static void macvlan_process_broadcast(struct work_struct *w)
270 {
271         struct macvlan_port *port = container_of(w, struct macvlan_port,
272                                                  bc_work);
273         struct sk_buff *skb;
274         struct sk_buff_head list;
275 
276         __skb_queue_head_init(&list);
277 
278         spin_lock_bh(&port->bc_queue.lock);
279         skb_queue_splice_tail_init(&port->bc_queue, &list);
280         spin_unlock_bh(&port->bc_queue.lock);
281 
282         while ((skb = __skb_dequeue(&list))) {
283                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
284 
285                 rcu_read_lock();
286 
287                 if (!src)
288                         /* frame comes from an external address */
289                         macvlan_broadcast(skb, port, NULL,
290                                           MACVLAN_MODE_PRIVATE |
291                                           MACVLAN_MODE_VEPA    |
292                                           MACVLAN_MODE_PASSTHRU|
293                                           MACVLAN_MODE_BRIDGE);
294                 else if (src->mode == MACVLAN_MODE_VEPA)
295                         /* flood to everyone except source */
296                         macvlan_broadcast(skb, port, src->dev,
297                                           MACVLAN_MODE_VEPA |
298                                           MACVLAN_MODE_BRIDGE);
299                 else
300                         /*
301                          * flood only to VEPA ports, bridge ports
302                          * already saw the frame on the way out.
303                          */
304                         macvlan_broadcast(skb, port, src->dev,
305                                           MACVLAN_MODE_VEPA);
306 
307                 rcu_read_unlock();
308 
309                 if (src)
310                         dev_put(src->dev);
311                 kfree_skb(skb);
312         }
313 }
314 
315 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
316                                       const struct macvlan_dev *src,
317                                       struct sk_buff *skb)
318 {
319         struct sk_buff *nskb;
320         int err = -ENOMEM;
321 
322         nskb = skb_clone(skb, GFP_ATOMIC);
323         if (!nskb)
324                 goto err;
325 
326         MACVLAN_SKB_CB(nskb)->src = src;
327 
328         spin_lock(&port->bc_queue.lock);
329         if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
330                 if (src)
331                         dev_hold(src->dev);
332                 __skb_queue_tail(&port->bc_queue, nskb);
333                 err = 0;
334         }
335         spin_unlock(&port->bc_queue.lock);
336 
337         if (err)
338                 goto free_nskb;
339 
340         schedule_work(&port->bc_work);
341         return;
342 
343 free_nskb:
344         kfree_skb(nskb);
345 err:
346         atomic_long_inc(&skb->dev->rx_dropped);
347 }
348 
349 static void macvlan_flush_sources(struct macvlan_port *port,
350                                   struct macvlan_dev *vlan)
351 {
352         int i;
353 
354         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
355                 struct hlist_node *h, *n;
356 
357                 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
358                         struct macvlan_source_entry *entry;
359 
360                         entry = hlist_entry(h, struct macvlan_source_entry,
361                                             hlist);
362                         if (entry->vlan == vlan)
363                                 macvlan_hash_del_source(entry);
364                 }
365         }
366         vlan->macaddr_count = 0;
367 }
368 
369 static void macvlan_forward_source_one(struct sk_buff *skb,
370                                        struct macvlan_dev *vlan)
371 {
372         struct sk_buff *nskb;
373         struct net_device *dev;
374         int len;
375         int ret;
376 
377         dev = vlan->dev;
378         if (unlikely(!(dev->flags & IFF_UP)))
379                 return;
380 
381         nskb = skb_clone(skb, GFP_ATOMIC);
382         if (!nskb)
383                 return;
384 
385         len = nskb->len + ETH_HLEN;
386         nskb->dev = dev;
387         nskb->pkt_type = PACKET_HOST;
388 
389         ret = netif_rx(nskb);
390         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
391 }
392 
393 static void macvlan_forward_source(struct sk_buff *skb,
394                                    struct macvlan_port *port,
395                                    const unsigned char *addr)
396 {
397         struct macvlan_source_entry *entry;
398         u32 idx = macvlan_eth_hash(addr);
399         struct hlist_head *h = &port->vlan_source_hash[idx];
400 
401         hlist_for_each_entry_rcu(entry, h, hlist) {
402                 if (ether_addr_equal_64bits(entry->addr, addr))
403                         if (entry->vlan->dev->flags & IFF_UP)
404                                 macvlan_forward_source_one(skb, entry->vlan);
405         }
406 }
407 
408 /* called under rcu_read_lock() from netif_receive_skb */
409 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
410 {
411         struct macvlan_port *port;
412         struct sk_buff *skb = *pskb;
413         const struct ethhdr *eth = eth_hdr(skb);
414         const struct macvlan_dev *vlan;
415         const struct macvlan_dev *src;
416         struct net_device *dev;
417         unsigned int len = 0;
418         int ret;
419         rx_handler_result_t handle_res;
420 
421         port = macvlan_port_get_rcu(skb->dev);
422         if (is_multicast_ether_addr(eth->h_dest)) {
423                 unsigned int hash;
424 
425                 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
426                 if (!skb)
427                         return RX_HANDLER_CONSUMED;
428                 *pskb = skb;
429                 eth = eth_hdr(skb);
430                 macvlan_forward_source(skb, port, eth->h_source);
431                 src = macvlan_hash_lookup(port, eth->h_source);
432                 if (src && src->mode != MACVLAN_MODE_VEPA &&
433                     src->mode != MACVLAN_MODE_BRIDGE) {
434                         /* forward to original port. */
435                         vlan = src;
436                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
437                               netif_rx(skb);
438                         handle_res = RX_HANDLER_CONSUMED;
439                         goto out;
440                 }
441 
442                 hash = mc_hash(NULL, eth->h_dest);
443                 if (test_bit(hash, port->mc_filter))
444                         macvlan_broadcast_enqueue(port, src, skb);
445 
446                 return RX_HANDLER_PASS;
447         }
448 
449         macvlan_forward_source(skb, port, eth->h_source);
450         if (port->passthru)
451                 vlan = list_first_or_null_rcu(&port->vlans,
452                                               struct macvlan_dev, list);
453         else
454                 vlan = macvlan_hash_lookup(port, eth->h_dest);
455         if (vlan == NULL)
456                 return RX_HANDLER_PASS;
457 
458         dev = vlan->dev;
459         if (unlikely(!(dev->flags & IFF_UP))) {
460                 kfree_skb(skb);
461                 return RX_HANDLER_CONSUMED;
462         }
463         len = skb->len + ETH_HLEN;
464         skb = skb_share_check(skb, GFP_ATOMIC);
465         if (!skb) {
466                 ret = NET_RX_DROP;
467                 handle_res = RX_HANDLER_CONSUMED;
468                 goto out;
469         }
470 
471         *pskb = skb;
472         skb->dev = dev;
473         skb->pkt_type = PACKET_HOST;
474 
475         ret = NET_RX_SUCCESS;
476         handle_res = RX_HANDLER_ANOTHER;
477 out:
478         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
479         return handle_res;
480 }
481 
482 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
483 {
484         const struct macvlan_dev *vlan = netdev_priv(dev);
485         const struct macvlan_port *port = vlan->port;
486         const struct macvlan_dev *dest;
487 
488         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
489                 const struct ethhdr *eth = (void *)skb->data;
490 
491                 /* send to other bridge ports directly */
492                 if (is_multicast_ether_addr(eth->h_dest)) {
493                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
494                         goto xmit_world;
495                 }
496 
497                 dest = macvlan_hash_lookup(port, eth->h_dest);
498                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
499                         /* send to lowerdev first for its network taps */
500                         dev_forward_skb(vlan->lowerdev, skb);
501 
502                         return NET_XMIT_SUCCESS;
503                 }
504         }
505 
506 xmit_world:
507         skb->dev = vlan->lowerdev;
508         return dev_queue_xmit(skb);
509 }
510 
511 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
512 {
513 #ifdef CONFIG_NET_POLL_CONTROLLER
514         if (vlan->netpoll)
515                 netpoll_send_skb(vlan->netpoll, skb);
516 #else
517         BUG();
518 #endif
519         return NETDEV_TX_OK;
520 }
521 
522 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
523                                       struct net_device *dev)
524 {
525         unsigned int len = skb->len;
526         int ret;
527         struct macvlan_dev *vlan = netdev_priv(dev);
528 
529         if (unlikely(netpoll_tx_running(dev)))
530                 return macvlan_netpoll_send_skb(vlan, skb);
531 
532         if (vlan->fwd_priv) {
533                 skb->dev = vlan->lowerdev;
534                 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
535         } else {
536                 ret = macvlan_queue_xmit(skb, dev);
537         }
538 
539         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
540                 struct vlan_pcpu_stats *pcpu_stats;
541 
542                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
543                 u64_stats_update_begin(&pcpu_stats->syncp);
544                 pcpu_stats->tx_packets++;
545                 pcpu_stats->tx_bytes += len;
546                 u64_stats_update_end(&pcpu_stats->syncp);
547         } else {
548                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
549         }
550         return ret;
551 }
552 
553 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
554                                unsigned short type, const void *daddr,
555                                const void *saddr, unsigned len)
556 {
557         const struct macvlan_dev *vlan = netdev_priv(dev);
558         struct net_device *lowerdev = vlan->lowerdev;
559 
560         return dev_hard_header(skb, lowerdev, type, daddr,
561                                saddr ? : dev->dev_addr, len);
562 }
563 
564 static const struct header_ops macvlan_hard_header_ops = {
565         .create         = macvlan_hard_header,
566         .parse          = eth_header_parse,
567         .cache          = eth_header_cache,
568         .cache_update   = eth_header_cache_update,
569 };
570 
571 static struct rtnl_link_ops macvlan_link_ops;
572 
573 static int macvlan_open(struct net_device *dev)
574 {
575         struct macvlan_dev *vlan = netdev_priv(dev);
576         struct net_device *lowerdev = vlan->lowerdev;
577         int err;
578 
579         if (vlan->port->passthru) {
580                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
581                         err = dev_set_promiscuity(lowerdev, 1);
582                         if (err < 0)
583                                 goto out;
584                 }
585                 goto hash_add;
586         }
587 
588         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
589             dev->rtnl_link_ops == &macvlan_link_ops) {
590                 vlan->fwd_priv =
591                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
592 
593                 /* If we get a NULL pointer back, or if we get an error
594                  * then we should just fall through to the non accelerated path
595                  */
596                 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
597                         vlan->fwd_priv = NULL;
598                 } else
599                         return 0;
600         }
601 
602         err = -EBUSY;
603         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
604                 goto out;
605 
606         err = dev_uc_add(lowerdev, dev->dev_addr);
607         if (err < 0)
608                 goto out;
609         if (dev->flags & IFF_ALLMULTI) {
610                 err = dev_set_allmulti(lowerdev, 1);
611                 if (err < 0)
612                         goto del_unicast;
613         }
614 
615         if (dev->flags & IFF_PROMISC) {
616                 err = dev_set_promiscuity(lowerdev, 1);
617                 if (err < 0)
618                         goto clear_multi;
619         }
620 
621 hash_add:
622         macvlan_hash_add(vlan);
623         return 0;
624 
625 clear_multi:
626         dev_set_allmulti(lowerdev, -1);
627 del_unicast:
628         dev_uc_del(lowerdev, dev->dev_addr);
629 out:
630         if (vlan->fwd_priv) {
631                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
632                                                            vlan->fwd_priv);
633                 vlan->fwd_priv = NULL;
634         }
635         return err;
636 }
637 
638 static int macvlan_stop(struct net_device *dev)
639 {
640         struct macvlan_dev *vlan = netdev_priv(dev);
641         struct net_device *lowerdev = vlan->lowerdev;
642 
643         if (vlan->fwd_priv) {
644                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
645                                                            vlan->fwd_priv);
646                 vlan->fwd_priv = NULL;
647                 return 0;
648         }
649 
650         dev_uc_unsync(lowerdev, dev);
651         dev_mc_unsync(lowerdev, dev);
652 
653         if (vlan->port->passthru) {
654                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
655                         dev_set_promiscuity(lowerdev, -1);
656                 goto hash_del;
657         }
658 
659         if (dev->flags & IFF_ALLMULTI)
660                 dev_set_allmulti(lowerdev, -1);
661 
662         if (dev->flags & IFF_PROMISC)
663                 dev_set_promiscuity(lowerdev, -1);
664 
665         dev_uc_del(lowerdev, dev->dev_addr);
666 
667 hash_del:
668         macvlan_hash_del(vlan, !dev->dismantle);
669         return 0;
670 }
671 
672 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
673 {
674         struct macvlan_dev *vlan = netdev_priv(dev);
675         struct net_device *lowerdev = vlan->lowerdev;
676         int err;
677 
678         if (!(dev->flags & IFF_UP)) {
679                 /* Just copy in the new address */
680                 ether_addr_copy(dev->dev_addr, addr);
681         } else {
682                 /* Rehash and update the device filters */
683                 if (macvlan_addr_busy(vlan->port, addr))
684                         return -EBUSY;
685 
686                 if (!vlan->port->passthru) {
687                         err = dev_uc_add(lowerdev, addr);
688                         if (err)
689                                 return err;
690 
691                         dev_uc_del(lowerdev, dev->dev_addr);
692                 }
693 
694                 macvlan_hash_change_addr(vlan, addr);
695         }
696         return 0;
697 }
698 
699 static int macvlan_set_mac_address(struct net_device *dev, void *p)
700 {
701         struct macvlan_dev *vlan = netdev_priv(dev);
702         struct sockaddr *addr = p;
703 
704         if (!is_valid_ether_addr(addr->sa_data))
705                 return -EADDRNOTAVAIL;
706 
707         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
708                 dev_set_mac_address(vlan->lowerdev, addr);
709                 return 0;
710         }
711 
712         return macvlan_sync_address(dev, addr->sa_data);
713 }
714 
715 static void macvlan_change_rx_flags(struct net_device *dev, int change)
716 {
717         struct macvlan_dev *vlan = netdev_priv(dev);
718         struct net_device *lowerdev = vlan->lowerdev;
719 
720         if (dev->flags & IFF_UP) {
721                 if (change & IFF_ALLMULTI)
722                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
723                 if (change & IFF_PROMISC)
724                         dev_set_promiscuity(lowerdev,
725                                             dev->flags & IFF_PROMISC ? 1 : -1);
726 
727         }
728 }
729 
730 static void macvlan_compute_filter(unsigned long *mc_filter,
731                                    struct net_device *dev,
732                                    struct macvlan_dev *vlan)
733 {
734         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
735                 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
736         } else {
737                 struct netdev_hw_addr *ha;
738                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
739 
740                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
741                 netdev_for_each_mc_addr(ha, dev) {
742                         __set_bit(mc_hash(vlan, ha->addr), filter);
743                 }
744 
745                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
746 
747                 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
748         }
749 }
750 
751 static void macvlan_set_mac_lists(struct net_device *dev)
752 {
753         struct macvlan_dev *vlan = netdev_priv(dev);
754 
755         macvlan_compute_filter(vlan->mc_filter, dev, vlan);
756 
757         dev_uc_sync(vlan->lowerdev, dev);
758         dev_mc_sync(vlan->lowerdev, dev);
759 
760         /* This is slightly inaccurate as we're including the subscription
761          * list of vlan->lowerdev too.
762          *
763          * Bug alert: This only works if everyone has the same broadcast
764          * address as lowerdev.  As soon as someone changes theirs this
765          * will break.
766          *
767          * However, this is already broken as when you change your broadcast
768          * address we don't get called.
769          *
770          * The solution is to maintain a list of broadcast addresses like
771          * we do for uc/mc, if you care.
772          */
773         macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
774 }
775 
776 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
777 {
778         struct macvlan_dev *vlan = netdev_priv(dev);
779 
780         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
781                 return -EINVAL;
782         dev->mtu = new_mtu;
783         return 0;
784 }
785 
786 /*
787  * macvlan network devices have devices nesting below it and are a special
788  * "super class" of normal network devices; split their locks off into a
789  * separate class since they always nest.
790  */
791 static struct lock_class_key macvlan_netdev_addr_lock_key;
792 
793 #define ALWAYS_ON_FEATURES \
794         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \
795          NETIF_F_GSO_ROBUST)
796 
797 #define MACVLAN_FEATURES \
798         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
799          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \
800          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
801          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
802 
803 #define MACVLAN_STATE_MASK \
804         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
805 
806 static int macvlan_get_nest_level(struct net_device *dev)
807 {
808         return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
809 }
810 
811 static void macvlan_set_lockdep_class(struct net_device *dev)
812 {
813         netdev_lockdep_set_classes(dev);
814         lockdep_set_class_and_subclass(&dev->addr_list_lock,
815                                        &macvlan_netdev_addr_lock_key,
816                                        macvlan_get_nest_level(dev));
817 }
818 
819 static int macvlan_init(struct net_device *dev)
820 {
821         struct macvlan_dev *vlan = netdev_priv(dev);
822         const struct net_device *lowerdev = vlan->lowerdev;
823         struct macvlan_port *port = vlan->port;
824 
825         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
826                                   (lowerdev->state & MACVLAN_STATE_MASK);
827         dev->features           = lowerdev->features & MACVLAN_FEATURES;
828         dev->features           |= ALWAYS_ON_FEATURES;
829         dev->hw_features        |= NETIF_F_LRO;
830         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
831         dev->gso_max_size       = lowerdev->gso_max_size;
832         dev->gso_max_segs       = lowerdev->gso_max_segs;
833         dev->hard_header_len    = lowerdev->hard_header_len;
834 
835         macvlan_set_lockdep_class(dev);
836 
837         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
838         if (!vlan->pcpu_stats)
839                 return -ENOMEM;
840 
841         port->count += 1;
842 
843         return 0;
844 }
845 
846 static void macvlan_uninit(struct net_device *dev)
847 {
848         struct macvlan_dev *vlan = netdev_priv(dev);
849         struct macvlan_port *port = vlan->port;
850 
851         free_percpu(vlan->pcpu_stats);
852 
853         macvlan_flush_sources(port, vlan);
854         port->count -= 1;
855         if (!port->count)
856                 macvlan_port_destroy(port->dev);
857 }
858 
859 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
860                                                          struct rtnl_link_stats64 *stats)
861 {
862         struct macvlan_dev *vlan = netdev_priv(dev);
863 
864         if (vlan->pcpu_stats) {
865                 struct vlan_pcpu_stats *p;
866                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
867                 u32 rx_errors = 0, tx_dropped = 0;
868                 unsigned int start;
869                 int i;
870 
871                 for_each_possible_cpu(i) {
872                         p = per_cpu_ptr(vlan->pcpu_stats, i);
873                         do {
874                                 start = u64_stats_fetch_begin_irq(&p->syncp);
875                                 rx_packets      = p->rx_packets;
876                                 rx_bytes        = p->rx_bytes;
877                                 rx_multicast    = p->rx_multicast;
878                                 tx_packets      = p->tx_packets;
879                                 tx_bytes        = p->tx_bytes;
880                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
881 
882                         stats->rx_packets       += rx_packets;
883                         stats->rx_bytes         += rx_bytes;
884                         stats->multicast        += rx_multicast;
885                         stats->tx_packets       += tx_packets;
886                         stats->tx_bytes         += tx_bytes;
887                         /* rx_errors & tx_dropped are u32, updated
888                          * without syncp protection.
889                          */
890                         rx_errors       += p->rx_errors;
891                         tx_dropped      += p->tx_dropped;
892                 }
893                 stats->rx_errors        = rx_errors;
894                 stats->rx_dropped       = rx_errors;
895                 stats->tx_dropped       = tx_dropped;
896         }
897         return stats;
898 }
899 
900 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
901                                    __be16 proto, u16 vid)
902 {
903         struct macvlan_dev *vlan = netdev_priv(dev);
904         struct net_device *lowerdev = vlan->lowerdev;
905 
906         return vlan_vid_add(lowerdev, proto, vid);
907 }
908 
909 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
910                                     __be16 proto, u16 vid)
911 {
912         struct macvlan_dev *vlan = netdev_priv(dev);
913         struct net_device *lowerdev = vlan->lowerdev;
914 
915         vlan_vid_del(lowerdev, proto, vid);
916         return 0;
917 }
918 
919 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
920                            struct net_device *dev,
921                            const unsigned char *addr, u16 vid,
922                            u16 flags)
923 {
924         struct macvlan_dev *vlan = netdev_priv(dev);
925         int err = -EINVAL;
926 
927         /* Support unicast filter only on passthru devices.
928          * Multicast filter should be allowed on all devices.
929          */
930         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
931                 return -EOPNOTSUPP;
932 
933         if (flags & NLM_F_REPLACE)
934                 return -EOPNOTSUPP;
935 
936         if (is_unicast_ether_addr(addr))
937                 err = dev_uc_add_excl(dev, addr);
938         else if (is_multicast_ether_addr(addr))
939                 err = dev_mc_add_excl(dev, addr);
940 
941         return err;
942 }
943 
944 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
945                            struct net_device *dev,
946                            const unsigned char *addr, u16 vid)
947 {
948         struct macvlan_dev *vlan = netdev_priv(dev);
949         int err = -EINVAL;
950 
951         /* Support unicast filter only on passthru devices.
952          * Multicast filter should be allowed on all devices.
953          */
954         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
955                 return -EOPNOTSUPP;
956 
957         if (is_unicast_ether_addr(addr))
958                 err = dev_uc_del(dev, addr);
959         else if (is_multicast_ether_addr(addr))
960                 err = dev_mc_del(dev, addr);
961 
962         return err;
963 }
964 
965 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
966                                         struct ethtool_drvinfo *drvinfo)
967 {
968         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
969         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
970 }
971 
972 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
973                                               struct ethtool_link_ksettings *cmd)
974 {
975         const struct macvlan_dev *vlan = netdev_priv(dev);
976 
977         return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
978 }
979 
980 static netdev_features_t macvlan_fix_features(struct net_device *dev,
981                                               netdev_features_t features)
982 {
983         struct macvlan_dev *vlan = netdev_priv(dev);
984         netdev_features_t lowerdev_features = vlan->lowerdev->features;
985         netdev_features_t mask;
986 
987         features |= NETIF_F_ALL_FOR_ALL;
988         features &= (vlan->set_features | ~MACVLAN_FEATURES);
989         mask = features;
990 
991         lowerdev_features &= (features | ~NETIF_F_LRO);
992         features = netdev_increment_features(lowerdev_features, features, mask);
993         features |= ALWAYS_ON_FEATURES;
994         features &= ~NETIF_F_NETNS_LOCAL;
995 
996         return features;
997 }
998 
999 #ifdef CONFIG_NET_POLL_CONTROLLER
1000 static void macvlan_dev_poll_controller(struct net_device *dev)
1001 {
1002         return;
1003 }
1004 
1005 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1006 {
1007         struct macvlan_dev *vlan = netdev_priv(dev);
1008         struct net_device *real_dev = vlan->lowerdev;
1009         struct netpoll *netpoll;
1010         int err = 0;
1011 
1012         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1013         err = -ENOMEM;
1014         if (!netpoll)
1015                 goto out;
1016 
1017         err = __netpoll_setup(netpoll, real_dev);
1018         if (err) {
1019                 kfree(netpoll);
1020                 goto out;
1021         }
1022 
1023         vlan->netpoll = netpoll;
1024 
1025 out:
1026         return err;
1027 }
1028 
1029 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1030 {
1031         struct macvlan_dev *vlan = netdev_priv(dev);
1032         struct netpoll *netpoll = vlan->netpoll;
1033 
1034         if (!netpoll)
1035                 return;
1036 
1037         vlan->netpoll = NULL;
1038 
1039         __netpoll_free_async(netpoll);
1040 }
1041 #endif  /* CONFIG_NET_POLL_CONTROLLER */
1042 
1043 static int macvlan_dev_get_iflink(const struct net_device *dev)
1044 {
1045         struct macvlan_dev *vlan = netdev_priv(dev);
1046 
1047         return vlan->lowerdev->ifindex;
1048 }
1049 
1050 static const struct ethtool_ops macvlan_ethtool_ops = {
1051         .get_link               = ethtool_op_get_link,
1052         .get_link_ksettings     = macvlan_ethtool_get_link_ksettings,
1053         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1054 };
1055 
1056 static const struct net_device_ops macvlan_netdev_ops = {
1057         .ndo_init               = macvlan_init,
1058         .ndo_uninit             = macvlan_uninit,
1059         .ndo_open               = macvlan_open,
1060         .ndo_stop               = macvlan_stop,
1061         .ndo_start_xmit         = macvlan_start_xmit,
1062         .ndo_change_mtu         = macvlan_change_mtu,
1063         .ndo_fix_features       = macvlan_fix_features,
1064         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1065         .ndo_set_mac_address    = macvlan_set_mac_address,
1066         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1067         .ndo_get_stats64        = macvlan_dev_get_stats64,
1068         .ndo_validate_addr      = eth_validate_addr,
1069         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1070         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1071         .ndo_fdb_add            = macvlan_fdb_add,
1072         .ndo_fdb_del            = macvlan_fdb_del,
1073         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1074         .ndo_get_lock_subclass  = macvlan_get_nest_level,
1075 #ifdef CONFIG_NET_POLL_CONTROLLER
1076         .ndo_poll_controller    = macvlan_dev_poll_controller,
1077         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1078         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1079 #endif
1080         .ndo_get_iflink         = macvlan_dev_get_iflink,
1081         .ndo_features_check     = passthru_features_check,
1082 };
1083 
1084 void macvlan_common_setup(struct net_device *dev)
1085 {
1086         ether_setup(dev);
1087 
1088         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1089         netif_keep_dst(dev);
1090         dev->priv_flags        |= IFF_UNICAST_FLT;
1091         dev->netdev_ops         = &macvlan_netdev_ops;
1092         dev->destructor         = free_netdev;
1093         dev->header_ops         = &macvlan_hard_header_ops;
1094         dev->ethtool_ops        = &macvlan_ethtool_ops;
1095 }
1096 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1097 
1098 static void macvlan_setup(struct net_device *dev)
1099 {
1100         macvlan_common_setup(dev);
1101         dev->priv_flags |= IFF_NO_QUEUE;
1102 }
1103 
1104 static int macvlan_port_create(struct net_device *dev)
1105 {
1106         struct macvlan_port *port;
1107         unsigned int i;
1108         int err;
1109 
1110         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1111                 return -EINVAL;
1112 
1113         if (netif_is_ipvlan_port(dev))
1114                 return -EBUSY;
1115 
1116         port = kzalloc(sizeof(*port), GFP_KERNEL);
1117         if (port == NULL)
1118                 return -ENOMEM;
1119 
1120         port->passthru = false;
1121         port->dev = dev;
1122         INIT_LIST_HEAD(&port->vlans);
1123         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1124                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1125         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1126                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1127 
1128         skb_queue_head_init(&port->bc_queue);
1129         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1130 
1131         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1132         if (err)
1133                 kfree(port);
1134         else
1135                 dev->priv_flags |= IFF_MACVLAN_PORT;
1136         return err;
1137 }
1138 
1139 static void macvlan_port_destroy(struct net_device *dev)
1140 {
1141         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1142 
1143         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1144         netdev_rx_handler_unregister(dev);
1145 
1146         /* After this point, no packet can schedule bc_work anymore,
1147          * but we need to cancel it and purge left skbs if any.
1148          */
1149         cancel_work_sync(&port->bc_work);
1150         __skb_queue_purge(&port->bc_queue);
1151 
1152         kfree_rcu(port, rcu);
1153 }
1154 
1155 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1156 {
1157         if (tb[IFLA_ADDRESS]) {
1158                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1159                         return -EINVAL;
1160                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1161                         return -EADDRNOTAVAIL;
1162         }
1163 
1164         if (data && data[IFLA_MACVLAN_FLAGS] &&
1165             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1166                 return -EINVAL;
1167 
1168         if (data && data[IFLA_MACVLAN_MODE]) {
1169                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1170                 case MACVLAN_MODE_PRIVATE:
1171                 case MACVLAN_MODE_VEPA:
1172                 case MACVLAN_MODE_BRIDGE:
1173                 case MACVLAN_MODE_PASSTHRU:
1174                 case MACVLAN_MODE_SOURCE:
1175                         break;
1176                 default:
1177                         return -EINVAL;
1178                 }
1179         }
1180 
1181         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1182                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1183                 case MACVLAN_MACADDR_ADD:
1184                 case MACVLAN_MACADDR_DEL:
1185                 case MACVLAN_MACADDR_FLUSH:
1186                 case MACVLAN_MACADDR_SET:
1187                         break;
1188                 default:
1189                         return -EINVAL;
1190                 }
1191         }
1192 
1193         if (data && data[IFLA_MACVLAN_MACADDR]) {
1194                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1195                         return -EINVAL;
1196 
1197                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1198                         return -EADDRNOTAVAIL;
1199         }
1200 
1201         if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1202                 return -EINVAL;
1203 
1204         return 0;
1205 }
1206 
1207 /**
1208  * reconfigure list of remote source mac address
1209  * (only for macvlan devices in source mode)
1210  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1211  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1212  */
1213 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1214                                       struct nlattr *data[])
1215 {
1216         char *addr = NULL;
1217         int ret, rem, len;
1218         struct nlattr *nla, *head;
1219         struct macvlan_source_entry *entry;
1220 
1221         if (data[IFLA_MACVLAN_MACADDR])
1222                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1223 
1224         if (mode == MACVLAN_MACADDR_ADD) {
1225                 if (!addr)
1226                         return -EINVAL;
1227 
1228                 return macvlan_hash_add_source(vlan, addr);
1229 
1230         } else if (mode == MACVLAN_MACADDR_DEL) {
1231                 if (!addr)
1232                         return -EINVAL;
1233 
1234                 entry = macvlan_hash_lookup_source(vlan, addr);
1235                 if (entry) {
1236                         macvlan_hash_del_source(entry);
1237                         vlan->macaddr_count--;
1238                 }
1239         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1240                 macvlan_flush_sources(vlan->port, vlan);
1241         } else if (mode == MACVLAN_MACADDR_SET) {
1242                 macvlan_flush_sources(vlan->port, vlan);
1243 
1244                 if (addr) {
1245                         ret = macvlan_hash_add_source(vlan, addr);
1246                         if (ret)
1247                                 return ret;
1248                 }
1249 
1250                 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1251                         return 0;
1252 
1253                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1254                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1255 
1256                 nla_for_each_attr(nla, head, len, rem) {
1257                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1258                             nla_len(nla) != ETH_ALEN)
1259                                 continue;
1260 
1261                         addr = nla_data(nla);
1262                         ret = macvlan_hash_add_source(vlan, addr);
1263                         if (ret)
1264                                 return ret;
1265                 }
1266         } else {
1267                 return -EINVAL;
1268         }
1269 
1270         return 0;
1271 }
1272 
1273 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1274                            struct nlattr *tb[], struct nlattr *data[])
1275 {
1276         struct macvlan_dev *vlan = netdev_priv(dev);
1277         struct macvlan_port *port;
1278         struct net_device *lowerdev;
1279         int err;
1280         int macmode;
1281 
1282         if (!tb[IFLA_LINK])
1283                 return -EINVAL;
1284 
1285         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1286         if (lowerdev == NULL)
1287                 return -ENODEV;
1288 
1289         /* When creating macvlans or macvtaps on top of other macvlans - use
1290          * the real device as the lowerdev.
1291          */
1292         if (netif_is_macvlan(lowerdev))
1293                 lowerdev = macvlan_dev_real_dev(lowerdev);
1294 
1295         if (!tb[IFLA_MTU])
1296                 dev->mtu = lowerdev->mtu;
1297         else if (dev->mtu > lowerdev->mtu)
1298                 return -EINVAL;
1299 
1300         if (!tb[IFLA_ADDRESS])
1301                 eth_hw_addr_random(dev);
1302 
1303         if (!macvlan_port_exists(lowerdev)) {
1304                 err = macvlan_port_create(lowerdev);
1305                 if (err < 0)
1306                         return err;
1307         }
1308         port = macvlan_port_get_rtnl(lowerdev);
1309 
1310         /* Only 1 macvlan device can be created in passthru mode */
1311         if (port->passthru)
1312                 return -EINVAL;
1313 
1314         vlan->lowerdev = lowerdev;
1315         vlan->dev      = dev;
1316         vlan->port     = port;
1317         vlan->set_features = MACVLAN_FEATURES;
1318         vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1319 
1320         vlan->mode     = MACVLAN_MODE_VEPA;
1321         if (data && data[IFLA_MACVLAN_MODE])
1322                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1323 
1324         if (data && data[IFLA_MACVLAN_FLAGS])
1325                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1326 
1327         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1328                 if (port->count)
1329                         return -EINVAL;
1330                 port->passthru = true;
1331                 eth_hw_addr_inherit(dev, lowerdev);
1332         }
1333 
1334         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1335                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1336                         return -EINVAL;
1337                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1338                 err = macvlan_changelink_sources(vlan, macmode, data);
1339                 if (err)
1340                         return err;
1341         }
1342 
1343         err = register_netdevice(dev);
1344         if (err < 0)
1345                 return err;
1346 
1347         dev->priv_flags |= IFF_MACVLAN;
1348         err = netdev_upper_dev_link(lowerdev, dev);
1349         if (err)
1350                 goto unregister_netdev;
1351 
1352         list_add_tail_rcu(&vlan->list, &port->vlans);
1353         netif_stacked_transfer_operstate(lowerdev, dev);
1354         linkwatch_fire_event(dev);
1355 
1356         return 0;
1357 
1358 unregister_netdev:
1359         unregister_netdevice(dev);
1360 
1361         return err;
1362 }
1363 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1364 
1365 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1366                            struct nlattr *tb[], struct nlattr *data[])
1367 {
1368         return macvlan_common_newlink(src_net, dev, tb, data);
1369 }
1370 
1371 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1372 {
1373         struct macvlan_dev *vlan = netdev_priv(dev);
1374 
1375         if (vlan->mode == MACVLAN_MODE_SOURCE)
1376                 macvlan_flush_sources(vlan->port, vlan);
1377         list_del_rcu(&vlan->list);
1378         unregister_netdevice_queue(dev, head);
1379         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1380 }
1381 EXPORT_SYMBOL_GPL(macvlan_dellink);
1382 
1383 static int macvlan_changelink(struct net_device *dev,
1384                 struct nlattr *tb[], struct nlattr *data[])
1385 {
1386         struct macvlan_dev *vlan = netdev_priv(dev);
1387         enum macvlan_mode mode;
1388         bool set_mode = false;
1389         enum macvlan_macaddr_mode macmode;
1390         int ret;
1391 
1392         /* Validate mode, but don't set yet: setting flags may fail. */
1393         if (data && data[IFLA_MACVLAN_MODE]) {
1394                 set_mode = true;
1395                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1396                 /* Passthrough mode can't be set or cleared dynamically */
1397                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1398                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1399                         return -EINVAL;
1400                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1401                     vlan->mode != mode)
1402                         macvlan_flush_sources(vlan->port, vlan);
1403         }
1404 
1405         if (data && data[IFLA_MACVLAN_FLAGS]) {
1406                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1407                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1408                 if (vlan->port->passthru && promisc) {
1409                         int err;
1410 
1411                         if (flags & MACVLAN_FLAG_NOPROMISC)
1412                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1413                         else
1414                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1415                         if (err < 0)
1416                                 return err;
1417                 }
1418                 vlan->flags = flags;
1419         }
1420         if (set_mode)
1421                 vlan->mode = mode;
1422         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1423                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1424                         return -EINVAL;
1425                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1426                 ret = macvlan_changelink_sources(vlan, macmode, data);
1427                 if (ret)
1428                         return ret;
1429         }
1430         return 0;
1431 }
1432 
1433 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1434 {
1435         if (vlan->macaddr_count == 0)
1436                 return 0;
1437         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1438                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1439 }
1440 
1441 static size_t macvlan_get_size(const struct net_device *dev)
1442 {
1443         struct macvlan_dev *vlan = netdev_priv(dev);
1444 
1445         return (0
1446                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1447                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1448                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1449                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1450                 );
1451 }
1452 
1453 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1454                                      const struct macvlan_dev *vlan,
1455                                      const int i)
1456 {
1457         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1458         struct macvlan_source_entry *entry;
1459 
1460         hlist_for_each_entry_rcu(entry, h, hlist) {
1461                 if (entry->vlan != vlan)
1462                         continue;
1463                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1464                         return 1;
1465         }
1466         return 0;
1467 }
1468 
1469 static int macvlan_fill_info(struct sk_buff *skb,
1470                                 const struct net_device *dev)
1471 {
1472         struct macvlan_dev *vlan = netdev_priv(dev);
1473         int i;
1474         struct nlattr *nest;
1475 
1476         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1477                 goto nla_put_failure;
1478         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1479                 goto nla_put_failure;
1480         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1481                 goto nla_put_failure;
1482         if (vlan->macaddr_count > 0) {
1483                 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1484                 if (nest == NULL)
1485                         goto nla_put_failure;
1486 
1487                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1488                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1489                                 goto nla_put_failure;
1490                 }
1491                 nla_nest_end(skb, nest);
1492         }
1493         return 0;
1494 
1495 nla_put_failure:
1496         return -EMSGSIZE;
1497 }
1498 
1499 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1500         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1501         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1502         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1503         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1504         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1505         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1506 };
1507 
1508 int macvlan_link_register(struct rtnl_link_ops *ops)
1509 {
1510         /* common fields */
1511         ops->priv_size          = sizeof(struct macvlan_dev);
1512         ops->validate           = macvlan_validate;
1513         ops->maxtype            = IFLA_MACVLAN_MAX;
1514         ops->policy             = macvlan_policy;
1515         ops->changelink         = macvlan_changelink;
1516         ops->get_size           = macvlan_get_size;
1517         ops->fill_info          = macvlan_fill_info;
1518 
1519         return rtnl_link_register(ops);
1520 };
1521 EXPORT_SYMBOL_GPL(macvlan_link_register);
1522 
1523 static struct net *macvlan_get_link_net(const struct net_device *dev)
1524 {
1525         return dev_net(macvlan_dev_real_dev(dev));
1526 }
1527 
1528 static struct rtnl_link_ops macvlan_link_ops = {
1529         .kind           = "macvlan",
1530         .setup          = macvlan_setup,
1531         .newlink        = macvlan_newlink,
1532         .dellink        = macvlan_dellink,
1533         .get_link_net   = macvlan_get_link_net,
1534 };
1535 
1536 static int macvlan_device_event(struct notifier_block *unused,
1537                                 unsigned long event, void *ptr)
1538 {
1539         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1540         struct macvlan_dev *vlan, *next;
1541         struct macvlan_port *port;
1542         LIST_HEAD(list_kill);
1543 
1544         if (!macvlan_port_exists(dev))
1545                 return NOTIFY_DONE;
1546 
1547         port = macvlan_port_get_rtnl(dev);
1548 
1549         switch (event) {
1550         case NETDEV_UP:
1551         case NETDEV_CHANGE:
1552                 list_for_each_entry(vlan, &port->vlans, list)
1553                         netif_stacked_transfer_operstate(vlan->lowerdev,
1554                                                          vlan->dev);
1555                 break;
1556         case NETDEV_FEAT_CHANGE:
1557                 list_for_each_entry(vlan, &port->vlans, list) {
1558                         vlan->dev->gso_max_size = dev->gso_max_size;
1559                         vlan->dev->gso_max_segs = dev->gso_max_segs;
1560                         netdev_update_features(vlan->dev);
1561                 }
1562                 break;
1563         case NETDEV_CHANGEMTU:
1564                 list_for_each_entry(vlan, &port->vlans, list) {
1565                         if (vlan->dev->mtu <= dev->mtu)
1566                                 continue;
1567                         dev_set_mtu(vlan->dev, dev->mtu);
1568                 }
1569                 break;
1570         case NETDEV_CHANGEADDR:
1571                 if (!port->passthru)
1572                         return NOTIFY_DONE;
1573 
1574                 vlan = list_first_entry_or_null(&port->vlans,
1575                                                 struct macvlan_dev,
1576                                                 list);
1577 
1578                 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1579                         return NOTIFY_BAD;
1580 
1581                 break;
1582         case NETDEV_UNREGISTER:
1583                 /* twiddle thumbs on netns device moves */
1584                 if (dev->reg_state != NETREG_UNREGISTERING)
1585                         break;
1586 
1587                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1588                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1589                 unregister_netdevice_many(&list_kill);
1590                 break;
1591         case NETDEV_PRE_TYPE_CHANGE:
1592                 /* Forbid underlaying device to change its type. */
1593                 return NOTIFY_BAD;
1594 
1595         case NETDEV_NOTIFY_PEERS:
1596         case NETDEV_BONDING_FAILOVER:
1597         case NETDEV_RESEND_IGMP:
1598                 /* Propagate to all vlans */
1599                 list_for_each_entry(vlan, &port->vlans, list)
1600                         call_netdevice_notifiers(event, vlan->dev);
1601         }
1602         return NOTIFY_DONE;
1603 }
1604 
1605 static struct notifier_block macvlan_notifier_block __read_mostly = {
1606         .notifier_call  = macvlan_device_event,
1607 };
1608 
1609 static int __init macvlan_init_module(void)
1610 {
1611         int err;
1612 
1613         register_netdevice_notifier(&macvlan_notifier_block);
1614 
1615         err = macvlan_link_register(&macvlan_link_ops);
1616         if (err < 0)
1617                 goto err1;
1618         return 0;
1619 err1:
1620         unregister_netdevice_notifier(&macvlan_notifier_block);
1621         return err;
1622 }
1623 
1624 static void __exit macvlan_cleanup_module(void)
1625 {
1626         rtnl_link_unregister(&macvlan_link_ops);
1627         unregister_netdevice_notifier(&macvlan_notifier_block);
1628 }
1629 
1630 module_init(macvlan_init_module);
1631 module_exit(macvlan_cleanup_module);
1632 
1633 MODULE_LICENSE("GPL");
1634 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1635 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1636 MODULE_ALIAS_RTNL_LINK("macvlan");
1637 

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