Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 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

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         .rebuild        = eth_rebuild_header,
554         .parse          = eth_header_parse,
555         .cache          = eth_header_cache,
556         .cache_update   = eth_header_cache_update,
557 };
558 
559 static struct rtnl_link_ops macvlan_link_ops;
560 
561 static int macvlan_open(struct net_device *dev)
562 {
563         struct macvlan_dev *vlan = netdev_priv(dev);
564         struct net_device *lowerdev = vlan->lowerdev;
565         int err;
566 
567         if (vlan->port->passthru) {
568                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
569                         err = dev_set_promiscuity(lowerdev, 1);
570                         if (err < 0)
571                                 goto out;
572                 }
573                 goto hash_add;
574         }
575 
576         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
577             dev->rtnl_link_ops == &macvlan_link_ops) {
578                 vlan->fwd_priv =
579                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
580 
581                 /* If we get a NULL pointer back, or if we get an error
582                  * then we should just fall through to the non accelerated path
583                  */
584                 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
585                         vlan->fwd_priv = NULL;
586                 } else
587                         return 0;
588         }
589 
590         err = -EBUSY;
591         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
592                 goto out;
593 
594         err = dev_uc_add(lowerdev, dev->dev_addr);
595         if (err < 0)
596                 goto out;
597         if (dev->flags & IFF_ALLMULTI) {
598                 err = dev_set_allmulti(lowerdev, 1);
599                 if (err < 0)
600                         goto del_unicast;
601         }
602 
603 hash_add:
604         macvlan_hash_add(vlan);
605         return 0;
606 
607 del_unicast:
608         dev_uc_del(lowerdev, dev->dev_addr);
609 out:
610         if (vlan->fwd_priv) {
611                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
612                                                            vlan->fwd_priv);
613                 vlan->fwd_priv = NULL;
614         }
615         return err;
616 }
617 
618 static int macvlan_stop(struct net_device *dev)
619 {
620         struct macvlan_dev *vlan = netdev_priv(dev);
621         struct net_device *lowerdev = vlan->lowerdev;
622 
623         if (vlan->fwd_priv) {
624                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
625                                                            vlan->fwd_priv);
626                 vlan->fwd_priv = NULL;
627                 return 0;
628         }
629 
630         dev_uc_unsync(lowerdev, dev);
631         dev_mc_unsync(lowerdev, dev);
632 
633         if (vlan->port->passthru) {
634                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
635                         dev_set_promiscuity(lowerdev, -1);
636                 goto hash_del;
637         }
638 
639         if (dev->flags & IFF_ALLMULTI)
640                 dev_set_allmulti(lowerdev, -1);
641 
642         dev_uc_del(lowerdev, dev->dev_addr);
643 
644 hash_del:
645         macvlan_hash_del(vlan, !dev->dismantle);
646         return 0;
647 }
648 
649 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
650 {
651         struct macvlan_dev *vlan = netdev_priv(dev);
652         struct net_device *lowerdev = vlan->lowerdev;
653         int err;
654 
655         if (!(dev->flags & IFF_UP)) {
656                 /* Just copy in the new address */
657                 ether_addr_copy(dev->dev_addr, addr);
658         } else {
659                 /* Rehash and update the device filters */
660                 if (macvlan_addr_busy(vlan->port, addr))
661                         return -EBUSY;
662 
663                 if (!vlan->port->passthru) {
664                         err = dev_uc_add(lowerdev, addr);
665                         if (err)
666                                 return err;
667 
668                         dev_uc_del(lowerdev, dev->dev_addr);
669                 }
670 
671                 macvlan_hash_change_addr(vlan, addr);
672         }
673         return 0;
674 }
675 
676 static int macvlan_set_mac_address(struct net_device *dev, void *p)
677 {
678         struct macvlan_dev *vlan = netdev_priv(dev);
679         struct sockaddr *addr = p;
680 
681         if (!is_valid_ether_addr(addr->sa_data))
682                 return -EADDRNOTAVAIL;
683 
684         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
685                 dev_set_mac_address(vlan->lowerdev, addr);
686                 return 0;
687         }
688 
689         return macvlan_sync_address(dev, addr->sa_data);
690 }
691 
692 static void macvlan_change_rx_flags(struct net_device *dev, int change)
693 {
694         struct macvlan_dev *vlan = netdev_priv(dev);
695         struct net_device *lowerdev = vlan->lowerdev;
696 
697         if (dev->flags & IFF_UP) {
698                 if (change & IFF_ALLMULTI)
699                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
700         }
701 }
702 
703 static void macvlan_set_mac_lists(struct net_device *dev)
704 {
705         struct macvlan_dev *vlan = netdev_priv(dev);
706 
707         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
708                 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
709         } else {
710                 struct netdev_hw_addr *ha;
711                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
712 
713                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
714                 netdev_for_each_mc_addr(ha, dev) {
715                         __set_bit(mc_hash(vlan, ha->addr), filter);
716                 }
717 
718                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
719 
720                 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
721         }
722         dev_uc_sync(vlan->lowerdev, dev);
723         dev_mc_sync(vlan->lowerdev, dev);
724 }
725 
726 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
727 {
728         struct macvlan_dev *vlan = netdev_priv(dev);
729 
730         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
731                 return -EINVAL;
732         dev->mtu = new_mtu;
733         return 0;
734 }
735 
736 /*
737  * macvlan network devices have devices nesting below it and are a special
738  * "super class" of normal network devices; split their locks off into a
739  * separate class since they always nest.
740  */
741 static struct lock_class_key macvlan_netdev_xmit_lock_key;
742 static struct lock_class_key macvlan_netdev_addr_lock_key;
743 
744 #define ALWAYS_ON_FEATURES \
745         (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX)
746 
747 #define MACVLAN_FEATURES \
748         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
749          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
750          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
751          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
752 
753 #define MACVLAN_STATE_MASK \
754         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
755 
756 static int macvlan_get_nest_level(struct net_device *dev)
757 {
758         return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
759 }
760 
761 static void macvlan_set_lockdep_class_one(struct net_device *dev,
762                                           struct netdev_queue *txq,
763                                           void *_unused)
764 {
765         lockdep_set_class(&txq->_xmit_lock,
766                           &macvlan_netdev_xmit_lock_key);
767 }
768 
769 static void macvlan_set_lockdep_class(struct net_device *dev)
770 {
771         lockdep_set_class_and_subclass(&dev->addr_list_lock,
772                                        &macvlan_netdev_addr_lock_key,
773                                        macvlan_get_nest_level(dev));
774         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
775 }
776 
777 static int macvlan_init(struct net_device *dev)
778 {
779         struct macvlan_dev *vlan = netdev_priv(dev);
780         const struct net_device *lowerdev = vlan->lowerdev;
781 
782         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
783                                   (lowerdev->state & MACVLAN_STATE_MASK);
784         dev->features           = lowerdev->features & MACVLAN_FEATURES;
785         dev->features           |= ALWAYS_ON_FEATURES;
786         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
787         dev->gso_max_size       = lowerdev->gso_max_size;
788         dev->iflink             = lowerdev->ifindex;
789         dev->hard_header_len    = lowerdev->hard_header_len;
790 
791         macvlan_set_lockdep_class(dev);
792 
793         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
794         if (!vlan->pcpu_stats)
795                 return -ENOMEM;
796 
797         return 0;
798 }
799 
800 static void macvlan_uninit(struct net_device *dev)
801 {
802         struct macvlan_dev *vlan = netdev_priv(dev);
803         struct macvlan_port *port = vlan->port;
804 
805         free_percpu(vlan->pcpu_stats);
806 
807         macvlan_flush_sources(port, vlan);
808         port->count -= 1;
809         if (!port->count)
810                 macvlan_port_destroy(port->dev);
811 }
812 
813 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
814                                                          struct rtnl_link_stats64 *stats)
815 {
816         struct macvlan_dev *vlan = netdev_priv(dev);
817 
818         if (vlan->pcpu_stats) {
819                 struct vlan_pcpu_stats *p;
820                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
821                 u32 rx_errors = 0, tx_dropped = 0;
822                 unsigned int start;
823                 int i;
824 
825                 for_each_possible_cpu(i) {
826                         p = per_cpu_ptr(vlan->pcpu_stats, i);
827                         do {
828                                 start = u64_stats_fetch_begin_irq(&p->syncp);
829                                 rx_packets      = p->rx_packets;
830                                 rx_bytes        = p->rx_bytes;
831                                 rx_multicast    = p->rx_multicast;
832                                 tx_packets      = p->tx_packets;
833                                 tx_bytes        = p->tx_bytes;
834                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
835 
836                         stats->rx_packets       += rx_packets;
837                         stats->rx_bytes         += rx_bytes;
838                         stats->multicast        += rx_multicast;
839                         stats->tx_packets       += tx_packets;
840                         stats->tx_bytes         += tx_bytes;
841                         /* rx_errors & tx_dropped are u32, updated
842                          * without syncp protection.
843                          */
844                         rx_errors       += p->rx_errors;
845                         tx_dropped      += p->tx_dropped;
846                 }
847                 stats->rx_errors        = rx_errors;
848                 stats->rx_dropped       = rx_errors;
849                 stats->tx_dropped       = tx_dropped;
850         }
851         return stats;
852 }
853 
854 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
855                                    __be16 proto, u16 vid)
856 {
857         struct macvlan_dev *vlan = netdev_priv(dev);
858         struct net_device *lowerdev = vlan->lowerdev;
859 
860         return vlan_vid_add(lowerdev, proto, vid);
861 }
862 
863 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
864                                     __be16 proto, u16 vid)
865 {
866         struct macvlan_dev *vlan = netdev_priv(dev);
867         struct net_device *lowerdev = vlan->lowerdev;
868 
869         vlan_vid_del(lowerdev, proto, vid);
870         return 0;
871 }
872 
873 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
874                            struct net_device *dev,
875                            const unsigned char *addr,
876                            u16 flags)
877 {
878         struct macvlan_dev *vlan = netdev_priv(dev);
879         int err = -EINVAL;
880 
881         /* Support unicast filter only on passthru devices.
882          * Multicast filter should be allowed on all devices.
883          */
884         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
885                 return -EOPNOTSUPP;
886 
887         if (flags & NLM_F_REPLACE)
888                 return -EOPNOTSUPP;
889 
890         if (is_unicast_ether_addr(addr))
891                 err = dev_uc_add_excl(dev, addr);
892         else if (is_multicast_ether_addr(addr))
893                 err = dev_mc_add_excl(dev, addr);
894 
895         return err;
896 }
897 
898 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
899                            struct net_device *dev,
900                            const unsigned char *addr)
901 {
902         struct macvlan_dev *vlan = netdev_priv(dev);
903         int err = -EINVAL;
904 
905         /* Support unicast filter only on passthru devices.
906          * Multicast filter should be allowed on all devices.
907          */
908         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
909                 return -EOPNOTSUPP;
910 
911         if (is_unicast_ether_addr(addr))
912                 err = dev_uc_del(dev, addr);
913         else if (is_multicast_ether_addr(addr))
914                 err = dev_mc_del(dev, addr);
915 
916         return err;
917 }
918 
919 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
920                                         struct ethtool_drvinfo *drvinfo)
921 {
922         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
923         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
924 }
925 
926 static int macvlan_ethtool_get_settings(struct net_device *dev,
927                                         struct ethtool_cmd *cmd)
928 {
929         const struct macvlan_dev *vlan = netdev_priv(dev);
930 
931         return __ethtool_get_settings(vlan->lowerdev, cmd);
932 }
933 
934 static netdev_features_t macvlan_fix_features(struct net_device *dev,
935                                               netdev_features_t features)
936 {
937         struct macvlan_dev *vlan = netdev_priv(dev);
938         netdev_features_t mask;
939 
940         features |= NETIF_F_ALL_FOR_ALL;
941         features &= (vlan->set_features | ~MACVLAN_FEATURES);
942         mask = features;
943 
944         features = netdev_increment_features(vlan->lowerdev->features,
945                                              features,
946                                              mask);
947         features |= ALWAYS_ON_FEATURES;
948         features &= ~NETIF_F_NETNS_LOCAL;
949 
950         return features;
951 }
952 
953 #ifdef CONFIG_NET_POLL_CONTROLLER
954 static void macvlan_dev_poll_controller(struct net_device *dev)
955 {
956         return;
957 }
958 
959 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
960 {
961         struct macvlan_dev *vlan = netdev_priv(dev);
962         struct net_device *real_dev = vlan->lowerdev;
963         struct netpoll *netpoll;
964         int err = 0;
965 
966         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
967         err = -ENOMEM;
968         if (!netpoll)
969                 goto out;
970 
971         err = __netpoll_setup(netpoll, real_dev);
972         if (err) {
973                 kfree(netpoll);
974                 goto out;
975         }
976 
977         vlan->netpoll = netpoll;
978 
979 out:
980         return err;
981 }
982 
983 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
984 {
985         struct macvlan_dev *vlan = netdev_priv(dev);
986         struct netpoll *netpoll = vlan->netpoll;
987 
988         if (!netpoll)
989                 return;
990 
991         vlan->netpoll = NULL;
992 
993         __netpoll_free_async(netpoll);
994 }
995 #endif  /* CONFIG_NET_POLL_CONTROLLER */
996 
997 static const struct ethtool_ops macvlan_ethtool_ops = {
998         .get_link               = ethtool_op_get_link,
999         .get_settings           = macvlan_ethtool_get_settings,
1000         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1001 };
1002 
1003 static const struct net_device_ops macvlan_netdev_ops = {
1004         .ndo_init               = macvlan_init,
1005         .ndo_uninit             = macvlan_uninit,
1006         .ndo_open               = macvlan_open,
1007         .ndo_stop               = macvlan_stop,
1008         .ndo_start_xmit         = macvlan_start_xmit,
1009         .ndo_change_mtu         = macvlan_change_mtu,
1010         .ndo_fix_features       = macvlan_fix_features,
1011         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1012         .ndo_set_mac_address    = macvlan_set_mac_address,
1013         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1014         .ndo_get_stats64        = macvlan_dev_get_stats64,
1015         .ndo_validate_addr      = eth_validate_addr,
1016         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1017         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1018         .ndo_fdb_add            = macvlan_fdb_add,
1019         .ndo_fdb_del            = macvlan_fdb_del,
1020         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1021         .ndo_get_lock_subclass  = macvlan_get_nest_level,
1022 #ifdef CONFIG_NET_POLL_CONTROLLER
1023         .ndo_poll_controller    = macvlan_dev_poll_controller,
1024         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1025         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1026 #endif
1027 };
1028 
1029 void macvlan_common_setup(struct net_device *dev)
1030 {
1031         ether_setup(dev);
1032 
1033         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1034         netif_keep_dst(dev);
1035         dev->priv_flags        |= IFF_UNICAST_FLT;
1036         dev->netdev_ops         = &macvlan_netdev_ops;
1037         dev->destructor         = free_netdev;
1038         dev->header_ops         = &macvlan_hard_header_ops;
1039         dev->ethtool_ops        = &macvlan_ethtool_ops;
1040 }
1041 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1042 
1043 static void macvlan_setup(struct net_device *dev)
1044 {
1045         macvlan_common_setup(dev);
1046         dev->tx_queue_len       = 0;
1047 }
1048 
1049 static int macvlan_port_create(struct net_device *dev)
1050 {
1051         struct macvlan_port *port;
1052         unsigned int i;
1053         int err;
1054 
1055         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1056                 return -EINVAL;
1057 
1058         port = kzalloc(sizeof(*port), GFP_KERNEL);
1059         if (port == NULL)
1060                 return -ENOMEM;
1061 
1062         port->passthru = false;
1063         port->dev = dev;
1064         INIT_LIST_HEAD(&port->vlans);
1065         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1066                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1067         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1068                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1069 
1070         skb_queue_head_init(&port->bc_queue);
1071         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1072 
1073         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1074         if (err)
1075                 kfree(port);
1076         else
1077                 dev->priv_flags |= IFF_MACVLAN_PORT;
1078         return err;
1079 }
1080 
1081 static void macvlan_port_destroy(struct net_device *dev)
1082 {
1083         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1084 
1085         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1086         netdev_rx_handler_unregister(dev);
1087 
1088         /* After this point, no packet can schedule bc_work anymore,
1089          * but we need to cancel it and purge left skbs if any.
1090          */
1091         cancel_work_sync(&port->bc_work);
1092         __skb_queue_purge(&port->bc_queue);
1093 
1094         kfree_rcu(port, rcu);
1095 }
1096 
1097 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1098 {
1099         if (tb[IFLA_ADDRESS]) {
1100                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1101                         return -EINVAL;
1102                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1103                         return -EADDRNOTAVAIL;
1104         }
1105 
1106         if (data && data[IFLA_MACVLAN_FLAGS] &&
1107             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1108                 return -EINVAL;
1109 
1110         if (data && data[IFLA_MACVLAN_MODE]) {
1111                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1112                 case MACVLAN_MODE_PRIVATE:
1113                 case MACVLAN_MODE_VEPA:
1114                 case MACVLAN_MODE_BRIDGE:
1115                 case MACVLAN_MODE_PASSTHRU:
1116                 case MACVLAN_MODE_SOURCE:
1117                         break;
1118                 default:
1119                         return -EINVAL;
1120                 }
1121         }
1122 
1123         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1124                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1125                 case MACVLAN_MACADDR_ADD:
1126                 case MACVLAN_MACADDR_DEL:
1127                 case MACVLAN_MACADDR_FLUSH:
1128                 case MACVLAN_MACADDR_SET:
1129                         break;
1130                 default:
1131                         return -EINVAL;
1132                 }
1133         }
1134 
1135         if (data && data[IFLA_MACVLAN_MACADDR]) {
1136                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1137                         return -EINVAL;
1138 
1139                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1140                         return -EADDRNOTAVAIL;
1141         }
1142 
1143         if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1144                 return -EINVAL;
1145 
1146         return 0;
1147 }
1148 
1149 /**
1150  * reconfigure list of remote source mac address
1151  * (only for macvlan devices in source mode)
1152  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1153  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1154  */
1155 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1156                                       struct nlattr *data[])
1157 {
1158         char *addr = NULL;
1159         int ret, rem, len;
1160         struct nlattr *nla, *head;
1161         struct macvlan_source_entry *entry;
1162 
1163         if (data[IFLA_MACVLAN_MACADDR])
1164                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1165 
1166         if (mode == MACVLAN_MACADDR_ADD) {
1167                 if (!addr)
1168                         return -EINVAL;
1169 
1170                 return macvlan_hash_add_source(vlan, addr);
1171 
1172         } else if (mode == MACVLAN_MACADDR_DEL) {
1173                 if (!addr)
1174                         return -EINVAL;
1175 
1176                 entry = macvlan_hash_lookup_source(vlan, addr);
1177                 if (entry) {
1178                         macvlan_hash_del_source(entry);
1179                         vlan->macaddr_count--;
1180                 }
1181         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1182                 macvlan_flush_sources(vlan->port, vlan);
1183         } else if (mode == MACVLAN_MACADDR_SET) {
1184                 macvlan_flush_sources(vlan->port, vlan);
1185 
1186                 if (addr) {
1187                         ret = macvlan_hash_add_source(vlan, addr);
1188                         if (ret)
1189                                 return ret;
1190                 }
1191 
1192                 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1193                         return 0;
1194 
1195                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1196                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1197 
1198                 nla_for_each_attr(nla, head, len, rem) {
1199                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1200                             nla_len(nla) != ETH_ALEN)
1201                                 continue;
1202 
1203                         addr = nla_data(nla);
1204                         ret = macvlan_hash_add_source(vlan, addr);
1205                         if (ret)
1206                                 return ret;
1207                 }
1208         } else {
1209                 return -EINVAL;
1210         }
1211 
1212         return 0;
1213 }
1214 
1215 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1216                            struct nlattr *tb[], struct nlattr *data[])
1217 {
1218         struct macvlan_dev *vlan = netdev_priv(dev);
1219         struct macvlan_port *port;
1220         struct net_device *lowerdev;
1221         int err;
1222         int macmode;
1223 
1224         if (!tb[IFLA_LINK])
1225                 return -EINVAL;
1226 
1227         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1228         if (lowerdev == NULL)
1229                 return -ENODEV;
1230 
1231         /* When creating macvlans or macvtaps on top of other macvlans - use
1232          * the real device as the lowerdev.
1233          */
1234         if (netif_is_macvlan(lowerdev))
1235                 lowerdev = macvlan_dev_real_dev(lowerdev);
1236 
1237         if (!tb[IFLA_MTU])
1238                 dev->mtu = lowerdev->mtu;
1239         else if (dev->mtu > lowerdev->mtu)
1240                 return -EINVAL;
1241 
1242         if (!tb[IFLA_ADDRESS])
1243                 eth_hw_addr_random(dev);
1244 
1245         if (!macvlan_port_exists(lowerdev)) {
1246                 err = macvlan_port_create(lowerdev);
1247                 if (err < 0)
1248                         return err;
1249         }
1250         port = macvlan_port_get_rtnl(lowerdev);
1251 
1252         /* Only 1 macvlan device can be created in passthru mode */
1253         if (port->passthru)
1254                 return -EINVAL;
1255 
1256         vlan->lowerdev = lowerdev;
1257         vlan->dev      = dev;
1258         vlan->port     = port;
1259         vlan->set_features = MACVLAN_FEATURES;
1260         vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1261 
1262         vlan->mode     = MACVLAN_MODE_VEPA;
1263         if (data && data[IFLA_MACVLAN_MODE])
1264                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1265 
1266         if (data && data[IFLA_MACVLAN_FLAGS])
1267                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1268 
1269         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1270                 if (port->count)
1271                         return -EINVAL;
1272                 port->passthru = true;
1273                 eth_hw_addr_inherit(dev, lowerdev);
1274         }
1275 
1276         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1277                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1278                         return -EINVAL;
1279                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1280                 err = macvlan_changelink_sources(vlan, macmode, data);
1281                 if (err)
1282                         return err;
1283         }
1284 
1285         port->count += 1;
1286         err = register_netdevice(dev);
1287         if (err < 0)
1288                 goto destroy_port;
1289 
1290         dev->priv_flags |= IFF_MACVLAN;
1291         err = netdev_upper_dev_link(lowerdev, dev);
1292         if (err)
1293                 goto unregister_netdev;
1294 
1295         list_add_tail_rcu(&vlan->list, &port->vlans);
1296         netif_stacked_transfer_operstate(lowerdev, dev);
1297 
1298         return 0;
1299 
1300 unregister_netdev:
1301         unregister_netdevice(dev);
1302 destroy_port:
1303         port->count -= 1;
1304         if (!port->count)
1305                 macvlan_port_destroy(lowerdev);
1306 
1307         return err;
1308 }
1309 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1310 
1311 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1312                            struct nlattr *tb[], struct nlattr *data[])
1313 {
1314         return macvlan_common_newlink(src_net, dev, tb, data);
1315 }
1316 
1317 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1318 {
1319         struct macvlan_dev *vlan = netdev_priv(dev);
1320 
1321         if (vlan->mode == MACVLAN_MODE_SOURCE)
1322                 macvlan_flush_sources(vlan->port, vlan);
1323         list_del_rcu(&vlan->list);
1324         unregister_netdevice_queue(dev, head);
1325         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1326 }
1327 EXPORT_SYMBOL_GPL(macvlan_dellink);
1328 
1329 static int macvlan_changelink(struct net_device *dev,
1330                 struct nlattr *tb[], struct nlattr *data[])
1331 {
1332         struct macvlan_dev *vlan = netdev_priv(dev);
1333         enum macvlan_mode mode;
1334         bool set_mode = false;
1335         enum macvlan_macaddr_mode macmode;
1336         int ret;
1337 
1338         /* Validate mode, but don't set yet: setting flags may fail. */
1339         if (data && data[IFLA_MACVLAN_MODE]) {
1340                 set_mode = true;
1341                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1342                 /* Passthrough mode can't be set or cleared dynamically */
1343                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1344                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1345                         return -EINVAL;
1346                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1347                     vlan->mode != mode)
1348                         macvlan_flush_sources(vlan->port, vlan);
1349         }
1350 
1351         if (data && data[IFLA_MACVLAN_FLAGS]) {
1352                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1353                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1354                 if (vlan->port->passthru && promisc) {
1355                         int err;
1356 
1357                         if (flags & MACVLAN_FLAG_NOPROMISC)
1358                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1359                         else
1360                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1361                         if (err < 0)
1362                                 return err;
1363                 }
1364                 vlan->flags = flags;
1365         }
1366         if (set_mode)
1367                 vlan->mode = mode;
1368         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1369                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1370                         return -EINVAL;
1371                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1372                 ret = macvlan_changelink_sources(vlan, macmode, data);
1373                 if (ret)
1374                         return ret;
1375         }
1376         return 0;
1377 }
1378 
1379 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1380 {
1381         if (vlan->macaddr_count == 0)
1382                 return 0;
1383         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1384                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1385 }
1386 
1387 static size_t macvlan_get_size(const struct net_device *dev)
1388 {
1389         struct macvlan_dev *vlan = netdev_priv(dev);
1390 
1391         return (0
1392                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1393                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1394                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1395                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1396                 );
1397 }
1398 
1399 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1400                                      const struct macvlan_dev *vlan,
1401                                      const int i)
1402 {
1403         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1404         struct macvlan_source_entry *entry;
1405 
1406         hlist_for_each_entry_rcu(entry, h, hlist) {
1407                 if (entry->vlan != vlan)
1408                         continue;
1409                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1410                         return 1;
1411         }
1412         return 0;
1413 }
1414 
1415 static int macvlan_fill_info(struct sk_buff *skb,
1416                                 const struct net_device *dev)
1417 {
1418         struct macvlan_dev *vlan = netdev_priv(dev);
1419         int i;
1420         struct nlattr *nest;
1421 
1422         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1423                 goto nla_put_failure;
1424         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1425                 goto nla_put_failure;
1426         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1427                 goto nla_put_failure;
1428         if (vlan->macaddr_count > 0) {
1429                 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1430                 if (nest == NULL)
1431                         goto nla_put_failure;
1432 
1433                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1434                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1435                                 goto nla_put_failure;
1436                 }
1437                 nla_nest_end(skb, nest);
1438         }
1439         return 0;
1440 
1441 nla_put_failure:
1442         return -EMSGSIZE;
1443 }
1444 
1445 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1446         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1447         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1448         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1449         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1450         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1451         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1452 };
1453 
1454 int macvlan_link_register(struct rtnl_link_ops *ops)
1455 {
1456         /* common fields */
1457         ops->priv_size          = sizeof(struct macvlan_dev);
1458         ops->validate           = macvlan_validate;
1459         ops->maxtype            = IFLA_MACVLAN_MAX;
1460         ops->policy             = macvlan_policy;
1461         ops->changelink         = macvlan_changelink;
1462         ops->get_size           = macvlan_get_size;
1463         ops->fill_info          = macvlan_fill_info;
1464 
1465         return rtnl_link_register(ops);
1466 };
1467 EXPORT_SYMBOL_GPL(macvlan_link_register);
1468 
1469 static struct rtnl_link_ops macvlan_link_ops = {
1470         .kind           = "macvlan",
1471         .setup          = macvlan_setup,
1472         .newlink        = macvlan_newlink,
1473         .dellink        = macvlan_dellink,
1474 };
1475 
1476 static int macvlan_device_event(struct notifier_block *unused,
1477                                 unsigned long event, void *ptr)
1478 {
1479         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1480         struct macvlan_dev *vlan, *next;
1481         struct macvlan_port *port;
1482         LIST_HEAD(list_kill);
1483 
1484         if (!macvlan_port_exists(dev))
1485                 return NOTIFY_DONE;
1486 
1487         port = macvlan_port_get_rtnl(dev);
1488 
1489         switch (event) {
1490         case NETDEV_CHANGE:
1491                 list_for_each_entry(vlan, &port->vlans, list)
1492                         netif_stacked_transfer_operstate(vlan->lowerdev,
1493                                                          vlan->dev);
1494                 break;
1495         case NETDEV_FEAT_CHANGE:
1496                 list_for_each_entry(vlan, &port->vlans, list) {
1497                         vlan->dev->gso_max_size = dev->gso_max_size;
1498                         netdev_update_features(vlan->dev);
1499                 }
1500                 break;
1501         case NETDEV_CHANGEMTU:
1502                 list_for_each_entry(vlan, &port->vlans, list) {
1503                         if (vlan->dev->mtu <= dev->mtu)
1504                                 continue;
1505                         dev_set_mtu(vlan->dev, dev->mtu);
1506                 }
1507                 break;
1508         case NETDEV_CHANGEADDR:
1509                 if (!port->passthru)
1510                         return NOTIFY_DONE;
1511 
1512                 vlan = list_first_entry_or_null(&port->vlans,
1513                                                 struct macvlan_dev,
1514                                                 list);
1515 
1516                 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1517                         return NOTIFY_BAD;
1518 
1519                 break;
1520         case NETDEV_UNREGISTER:
1521                 /* twiddle thumbs on netns device moves */
1522                 if (dev->reg_state != NETREG_UNREGISTERING)
1523                         break;
1524 
1525                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1526                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1527                 unregister_netdevice_many(&list_kill);
1528                 break;
1529         case NETDEV_PRE_TYPE_CHANGE:
1530                 /* Forbid underlaying device to change its type. */
1531                 return NOTIFY_BAD;
1532 
1533         case NETDEV_NOTIFY_PEERS:
1534         case NETDEV_BONDING_FAILOVER:
1535         case NETDEV_RESEND_IGMP:
1536                 /* Propagate to all vlans */
1537                 list_for_each_entry(vlan, &port->vlans, list)
1538                         call_netdevice_notifiers(event, vlan->dev);
1539         }
1540         return NOTIFY_DONE;
1541 }
1542 
1543 static struct notifier_block macvlan_notifier_block __read_mostly = {
1544         .notifier_call  = macvlan_device_event,
1545 };
1546 
1547 static int __init macvlan_init_module(void)
1548 {
1549         int err;
1550 
1551         register_netdevice_notifier(&macvlan_notifier_block);
1552 
1553         err = macvlan_link_register(&macvlan_link_ops);
1554         if (err < 0)
1555                 goto err1;
1556         return 0;
1557 err1:
1558         unregister_netdevice_notifier(&macvlan_notifier_block);
1559         return err;
1560 }
1561 
1562 static void __exit macvlan_cleanup_module(void)
1563 {
1564         rtnl_link_unregister(&macvlan_link_ops);
1565         unregister_netdevice_notifier(&macvlan_notifier_block);
1566 }
1567 
1568 module_init(macvlan_init_module);
1569 module_exit(macvlan_cleanup_module);
1570 
1571 MODULE_LICENSE("GPL");
1572 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1573 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1574 MODULE_ALIAS_RTNL_LINK("macvlan");
1575 

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