Version:  2.0.40 2.2.26 2.4.37 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6

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(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
416                 if (!skb)
417                         return RX_HANDLER_CONSUMED;
418                 *pskb = skb;
419                 eth = eth_hdr(skb);
420                 macvlan_forward_source(skb, port, eth->h_source);
421                 src = macvlan_hash_lookup(port, eth->h_source);
422                 if (src && src->mode != MACVLAN_MODE_VEPA &&
423                     src->mode != MACVLAN_MODE_BRIDGE) {
424                         /* forward to original port. */
425                         vlan = src;
426                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
427                               netif_rx(skb);
428                         handle_res = RX_HANDLER_CONSUMED;
429                         goto out;
430                 }
431 
432                 MACVLAN_SKB_CB(skb)->src = src;
433                 macvlan_broadcast_enqueue(port, skb);
434 
435                 return RX_HANDLER_PASS;
436         }
437 
438         macvlan_forward_source(skb, port, eth->h_source);
439         if (port->passthru)
440                 vlan = list_first_or_null_rcu(&port->vlans,
441                                               struct macvlan_dev, list);
442         else
443                 vlan = macvlan_hash_lookup(port, eth->h_dest);
444         if (vlan == NULL)
445                 return RX_HANDLER_PASS;
446 
447         dev = vlan->dev;
448         if (unlikely(!(dev->flags & IFF_UP))) {
449                 kfree_skb(skb);
450                 return RX_HANDLER_CONSUMED;
451         }
452         len = skb->len + ETH_HLEN;
453         skb = skb_share_check(skb, GFP_ATOMIC);
454         if (!skb) {
455                 ret = NET_RX_DROP;
456                 handle_res = RX_HANDLER_CONSUMED;
457                 goto out;
458         }
459 
460         *pskb = skb;
461         skb->dev = dev;
462         skb->pkt_type = PACKET_HOST;
463 
464         ret = NET_RX_SUCCESS;
465         handle_res = RX_HANDLER_ANOTHER;
466 out:
467         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
468         return handle_res;
469 }
470 
471 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
472 {
473         const struct macvlan_dev *vlan = netdev_priv(dev);
474         const struct macvlan_port *port = vlan->port;
475         const struct macvlan_dev *dest;
476 
477         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
478                 const struct ethhdr *eth = (void *)skb->data;
479 
480                 /* send to other bridge ports directly */
481                 if (is_multicast_ether_addr(eth->h_dest)) {
482                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
483                         goto xmit_world;
484                 }
485 
486                 dest = macvlan_hash_lookup(port, eth->h_dest);
487                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
488                         /* send to lowerdev first for its network taps */
489                         dev_forward_skb(vlan->lowerdev, skb);
490 
491                         return NET_XMIT_SUCCESS;
492                 }
493         }
494 
495 xmit_world:
496         skb->dev = vlan->lowerdev;
497         return dev_queue_xmit(skb);
498 }
499 
500 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
501 {
502 #ifdef CONFIG_NET_POLL_CONTROLLER
503         if (vlan->netpoll)
504                 netpoll_send_skb(vlan->netpoll, skb);
505 #else
506         BUG();
507 #endif
508         return NETDEV_TX_OK;
509 }
510 
511 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
512                                       struct net_device *dev)
513 {
514         unsigned int len = skb->len;
515         int ret;
516         struct macvlan_dev *vlan = netdev_priv(dev);
517 
518         if (unlikely(netpoll_tx_running(dev)))
519                 return macvlan_netpoll_send_skb(vlan, skb);
520 
521         if (vlan->fwd_priv) {
522                 skb->dev = vlan->lowerdev;
523                 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
524         } else {
525                 ret = macvlan_queue_xmit(skb, dev);
526         }
527 
528         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
529                 struct vlan_pcpu_stats *pcpu_stats;
530 
531                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
532                 u64_stats_update_begin(&pcpu_stats->syncp);
533                 pcpu_stats->tx_packets++;
534                 pcpu_stats->tx_bytes += len;
535                 u64_stats_update_end(&pcpu_stats->syncp);
536         } else {
537                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
538         }
539         return ret;
540 }
541 
542 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
543                                unsigned short type, const void *daddr,
544                                const void *saddr, unsigned len)
545 {
546         const struct macvlan_dev *vlan = netdev_priv(dev);
547         struct net_device *lowerdev = vlan->lowerdev;
548 
549         return dev_hard_header(skb, lowerdev, type, daddr,
550                                saddr ? : dev->dev_addr, len);
551 }
552 
553 static const struct header_ops macvlan_hard_header_ops = {
554         .create         = macvlan_hard_header,
555         .parse          = eth_header_parse,
556         .cache          = eth_header_cache,
557         .cache_update   = eth_header_cache_update,
558 };
559 
560 static struct rtnl_link_ops macvlan_link_ops;
561 
562 static int macvlan_open(struct net_device *dev)
563 {
564         struct macvlan_dev *vlan = netdev_priv(dev);
565         struct net_device *lowerdev = vlan->lowerdev;
566         int err;
567 
568         if (vlan->port->passthru) {
569                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
570                         err = dev_set_promiscuity(lowerdev, 1);
571                         if (err < 0)
572                                 goto out;
573                 }
574                 goto hash_add;
575         }
576 
577         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
578             dev->rtnl_link_ops == &macvlan_link_ops) {
579                 vlan->fwd_priv =
580                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
581 
582                 /* If we get a NULL pointer back, or if we get an error
583                  * then we should just fall through to the non accelerated path
584                  */
585                 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
586                         vlan->fwd_priv = NULL;
587                 } else
588                         return 0;
589         }
590 
591         err = -EBUSY;
592         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
593                 goto out;
594 
595         err = dev_uc_add(lowerdev, dev->dev_addr);
596         if (err < 0)
597                 goto out;
598         if (dev->flags & IFF_ALLMULTI) {
599                 err = dev_set_allmulti(lowerdev, 1);
600                 if (err < 0)
601                         goto del_unicast;
602         }
603 
604         if (dev->flags & IFF_PROMISC) {
605                 err = dev_set_promiscuity(lowerdev, 1);
606                 if (err < 0)
607                         goto clear_multi;
608         }
609 
610 hash_add:
611         macvlan_hash_add(vlan);
612         return 0;
613 
614 clear_multi:
615         dev_set_allmulti(lowerdev, -1);
616 del_unicast:
617         dev_uc_del(lowerdev, dev->dev_addr);
618 out:
619         if (vlan->fwd_priv) {
620                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
621                                                            vlan->fwd_priv);
622                 vlan->fwd_priv = NULL;
623         }
624         return err;
625 }
626 
627 static int macvlan_stop(struct net_device *dev)
628 {
629         struct macvlan_dev *vlan = netdev_priv(dev);
630         struct net_device *lowerdev = vlan->lowerdev;
631 
632         if (vlan->fwd_priv) {
633                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
634                                                            vlan->fwd_priv);
635                 vlan->fwd_priv = NULL;
636                 return 0;
637         }
638 
639         dev_uc_unsync(lowerdev, dev);
640         dev_mc_unsync(lowerdev, dev);
641 
642         if (vlan->port->passthru) {
643                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
644                         dev_set_promiscuity(lowerdev, -1);
645                 goto hash_del;
646         }
647 
648         if (dev->flags & IFF_ALLMULTI)
649                 dev_set_allmulti(lowerdev, -1);
650 
651         if (dev->flags & IFF_PROMISC)
652                 dev_set_promiscuity(lowerdev, -1);
653 
654         dev_uc_del(lowerdev, dev->dev_addr);
655 
656 hash_del:
657         macvlan_hash_del(vlan, !dev->dismantle);
658         return 0;
659 }
660 
661 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
662 {
663         struct macvlan_dev *vlan = netdev_priv(dev);
664         struct net_device *lowerdev = vlan->lowerdev;
665         int err;
666 
667         if (!(dev->flags & IFF_UP)) {
668                 /* Just copy in the new address */
669                 ether_addr_copy(dev->dev_addr, addr);
670         } else {
671                 /* Rehash and update the device filters */
672                 if (macvlan_addr_busy(vlan->port, addr))
673                         return -EBUSY;
674 
675                 if (!vlan->port->passthru) {
676                         err = dev_uc_add(lowerdev, addr);
677                         if (err)
678                                 return err;
679 
680                         dev_uc_del(lowerdev, dev->dev_addr);
681                 }
682 
683                 macvlan_hash_change_addr(vlan, addr);
684         }
685         return 0;
686 }
687 
688 static int macvlan_set_mac_address(struct net_device *dev, void *p)
689 {
690         struct macvlan_dev *vlan = netdev_priv(dev);
691         struct sockaddr *addr = p;
692 
693         if (!is_valid_ether_addr(addr->sa_data))
694                 return -EADDRNOTAVAIL;
695 
696         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
697                 dev_set_mac_address(vlan->lowerdev, addr);
698                 return 0;
699         }
700 
701         return macvlan_sync_address(dev, addr->sa_data);
702 }
703 
704 static void macvlan_change_rx_flags(struct net_device *dev, int change)
705 {
706         struct macvlan_dev *vlan = netdev_priv(dev);
707         struct net_device *lowerdev = vlan->lowerdev;
708 
709         if (dev->flags & IFF_UP) {
710                 if (change & IFF_ALLMULTI)
711                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
712                 if (change & IFF_PROMISC)
713                         dev_set_promiscuity(lowerdev,
714                                             dev->flags & IFF_PROMISC ? 1 : -1);
715 
716         }
717 }
718 
719 static void macvlan_set_mac_lists(struct net_device *dev)
720 {
721         struct macvlan_dev *vlan = netdev_priv(dev);
722 
723         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
724                 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
725         } else {
726                 struct netdev_hw_addr *ha;
727                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
728 
729                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
730                 netdev_for_each_mc_addr(ha, dev) {
731                         __set_bit(mc_hash(vlan, ha->addr), filter);
732                 }
733 
734                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
735 
736                 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
737         }
738         dev_uc_sync(vlan->lowerdev, dev);
739         dev_mc_sync(vlan->lowerdev, dev);
740 }
741 
742 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
743 {
744         struct macvlan_dev *vlan = netdev_priv(dev);
745 
746         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
747                 return -EINVAL;
748         dev->mtu = new_mtu;
749         return 0;
750 }
751 
752 /*
753  * macvlan network devices have devices nesting below it and are a special
754  * "super class" of normal network devices; split their locks off into a
755  * separate class since they always nest.
756  */
757 static struct lock_class_key macvlan_netdev_xmit_lock_key;
758 static struct lock_class_key macvlan_netdev_addr_lock_key;
759 
760 #define ALWAYS_ON_FEATURES \
761         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \
762          NETIF_F_GSO_ROBUST)
763 
764 #define MACVLAN_FEATURES \
765         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
766          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \
767          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
768          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
769 
770 #define MACVLAN_STATE_MASK \
771         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
772 
773 static int macvlan_get_nest_level(struct net_device *dev)
774 {
775         return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
776 }
777 
778 static void macvlan_set_lockdep_class_one(struct net_device *dev,
779                                           struct netdev_queue *txq,
780                                           void *_unused)
781 {
782         lockdep_set_class(&txq->_xmit_lock,
783                           &macvlan_netdev_xmit_lock_key);
784 }
785 
786 static void macvlan_set_lockdep_class(struct net_device *dev)
787 {
788         lockdep_set_class_and_subclass(&dev->addr_list_lock,
789                                        &macvlan_netdev_addr_lock_key,
790                                        macvlan_get_nest_level(dev));
791         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
792 }
793 
794 static int macvlan_init(struct net_device *dev)
795 {
796         struct macvlan_dev *vlan = netdev_priv(dev);
797         const struct net_device *lowerdev = vlan->lowerdev;
798 
799         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
800                                   (lowerdev->state & MACVLAN_STATE_MASK);
801         dev->features           = lowerdev->features & MACVLAN_FEATURES;
802         dev->features           |= ALWAYS_ON_FEATURES;
803         dev->hw_features        |= NETIF_F_LRO;
804         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
805         dev->gso_max_size       = lowerdev->gso_max_size;
806         dev->gso_max_segs       = lowerdev->gso_max_segs;
807         dev->hard_header_len    = lowerdev->hard_header_len;
808 
809         macvlan_set_lockdep_class(dev);
810 
811         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
812         if (!vlan->pcpu_stats)
813                 return -ENOMEM;
814 
815         return 0;
816 }
817 
818 static void macvlan_uninit(struct net_device *dev)
819 {
820         struct macvlan_dev *vlan = netdev_priv(dev);
821         struct macvlan_port *port = vlan->port;
822 
823         free_percpu(vlan->pcpu_stats);
824 
825         macvlan_flush_sources(port, vlan);
826         port->count -= 1;
827         if (!port->count)
828                 macvlan_port_destroy(port->dev);
829 }
830 
831 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
832                                                          struct rtnl_link_stats64 *stats)
833 {
834         struct macvlan_dev *vlan = netdev_priv(dev);
835 
836         if (vlan->pcpu_stats) {
837                 struct vlan_pcpu_stats *p;
838                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
839                 u32 rx_errors = 0, tx_dropped = 0;
840                 unsigned int start;
841                 int i;
842 
843                 for_each_possible_cpu(i) {
844                         p = per_cpu_ptr(vlan->pcpu_stats, i);
845                         do {
846                                 start = u64_stats_fetch_begin_irq(&p->syncp);
847                                 rx_packets      = p->rx_packets;
848                                 rx_bytes        = p->rx_bytes;
849                                 rx_multicast    = p->rx_multicast;
850                                 tx_packets      = p->tx_packets;
851                                 tx_bytes        = p->tx_bytes;
852                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
853 
854                         stats->rx_packets       += rx_packets;
855                         stats->rx_bytes         += rx_bytes;
856                         stats->multicast        += rx_multicast;
857                         stats->tx_packets       += tx_packets;
858                         stats->tx_bytes         += tx_bytes;
859                         /* rx_errors & tx_dropped are u32, updated
860                          * without syncp protection.
861                          */
862                         rx_errors       += p->rx_errors;
863                         tx_dropped      += p->tx_dropped;
864                 }
865                 stats->rx_errors        = rx_errors;
866                 stats->rx_dropped       = rx_errors;
867                 stats->tx_dropped       = tx_dropped;
868         }
869         return stats;
870 }
871 
872 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
873                                    __be16 proto, u16 vid)
874 {
875         struct macvlan_dev *vlan = netdev_priv(dev);
876         struct net_device *lowerdev = vlan->lowerdev;
877 
878         return vlan_vid_add(lowerdev, proto, vid);
879 }
880 
881 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
882                                     __be16 proto, u16 vid)
883 {
884         struct macvlan_dev *vlan = netdev_priv(dev);
885         struct net_device *lowerdev = vlan->lowerdev;
886 
887         vlan_vid_del(lowerdev, proto, vid);
888         return 0;
889 }
890 
891 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
892                            struct net_device *dev,
893                            const unsigned char *addr, u16 vid,
894                            u16 flags)
895 {
896         struct macvlan_dev *vlan = netdev_priv(dev);
897         int err = -EINVAL;
898 
899         /* Support unicast filter only on passthru devices.
900          * Multicast filter should be allowed on all devices.
901          */
902         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
903                 return -EOPNOTSUPP;
904 
905         if (flags & NLM_F_REPLACE)
906                 return -EOPNOTSUPP;
907 
908         if (is_unicast_ether_addr(addr))
909                 err = dev_uc_add_excl(dev, addr);
910         else if (is_multicast_ether_addr(addr))
911                 err = dev_mc_add_excl(dev, addr);
912 
913         return err;
914 }
915 
916 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
917                            struct net_device *dev,
918                            const unsigned char *addr, u16 vid)
919 {
920         struct macvlan_dev *vlan = netdev_priv(dev);
921         int err = -EINVAL;
922 
923         /* Support unicast filter only on passthru devices.
924          * Multicast filter should be allowed on all devices.
925          */
926         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
927                 return -EOPNOTSUPP;
928 
929         if (is_unicast_ether_addr(addr))
930                 err = dev_uc_del(dev, addr);
931         else if (is_multicast_ether_addr(addr))
932                 err = dev_mc_del(dev, addr);
933 
934         return err;
935 }
936 
937 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
938                                         struct ethtool_drvinfo *drvinfo)
939 {
940         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
941         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
942 }
943 
944 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
945                                               struct ethtool_link_ksettings *cmd)
946 {
947         const struct macvlan_dev *vlan = netdev_priv(dev);
948 
949         return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
950 }
951 
952 static netdev_features_t macvlan_fix_features(struct net_device *dev,
953                                               netdev_features_t features)
954 {
955         struct macvlan_dev *vlan = netdev_priv(dev);
956         netdev_features_t lowerdev_features = vlan->lowerdev->features;
957         netdev_features_t mask;
958 
959         features |= NETIF_F_ALL_FOR_ALL;
960         features &= (vlan->set_features | ~MACVLAN_FEATURES);
961         mask = features;
962 
963         lowerdev_features &= (features | ~NETIF_F_LRO);
964         features = netdev_increment_features(lowerdev_features, features, mask);
965         features |= ALWAYS_ON_FEATURES;
966         features &= ~NETIF_F_NETNS_LOCAL;
967 
968         return features;
969 }
970 
971 #ifdef CONFIG_NET_POLL_CONTROLLER
972 static void macvlan_dev_poll_controller(struct net_device *dev)
973 {
974         return;
975 }
976 
977 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
978 {
979         struct macvlan_dev *vlan = netdev_priv(dev);
980         struct net_device *real_dev = vlan->lowerdev;
981         struct netpoll *netpoll;
982         int err = 0;
983 
984         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
985         err = -ENOMEM;
986         if (!netpoll)
987                 goto out;
988 
989         err = __netpoll_setup(netpoll, real_dev);
990         if (err) {
991                 kfree(netpoll);
992                 goto out;
993         }
994 
995         vlan->netpoll = netpoll;
996 
997 out:
998         return err;
999 }
1000 
1001 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1002 {
1003         struct macvlan_dev *vlan = netdev_priv(dev);
1004         struct netpoll *netpoll = vlan->netpoll;
1005 
1006         if (!netpoll)
1007                 return;
1008 
1009         vlan->netpoll = NULL;
1010 
1011         __netpoll_free_async(netpoll);
1012 }
1013 #endif  /* CONFIG_NET_POLL_CONTROLLER */
1014 
1015 static int macvlan_dev_get_iflink(const struct net_device *dev)
1016 {
1017         struct macvlan_dev *vlan = netdev_priv(dev);
1018 
1019         return vlan->lowerdev->ifindex;
1020 }
1021 
1022 static const struct ethtool_ops macvlan_ethtool_ops = {
1023         .get_link               = ethtool_op_get_link,
1024         .get_link_ksettings     = macvlan_ethtool_get_link_ksettings,
1025         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1026 };
1027 
1028 static const struct net_device_ops macvlan_netdev_ops = {
1029         .ndo_init               = macvlan_init,
1030         .ndo_uninit             = macvlan_uninit,
1031         .ndo_open               = macvlan_open,
1032         .ndo_stop               = macvlan_stop,
1033         .ndo_start_xmit         = macvlan_start_xmit,
1034         .ndo_change_mtu         = macvlan_change_mtu,
1035         .ndo_fix_features       = macvlan_fix_features,
1036         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1037         .ndo_set_mac_address    = macvlan_set_mac_address,
1038         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1039         .ndo_get_stats64        = macvlan_dev_get_stats64,
1040         .ndo_validate_addr      = eth_validate_addr,
1041         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1042         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1043         .ndo_fdb_add            = macvlan_fdb_add,
1044         .ndo_fdb_del            = macvlan_fdb_del,
1045         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1046         .ndo_get_lock_subclass  = macvlan_get_nest_level,
1047 #ifdef CONFIG_NET_POLL_CONTROLLER
1048         .ndo_poll_controller    = macvlan_dev_poll_controller,
1049         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1050         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1051 #endif
1052         .ndo_get_iflink         = macvlan_dev_get_iflink,
1053         .ndo_features_check     = passthru_features_check,
1054 };
1055 
1056 void macvlan_common_setup(struct net_device *dev)
1057 {
1058         ether_setup(dev);
1059 
1060         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1061         netif_keep_dst(dev);
1062         dev->priv_flags        |= IFF_UNICAST_FLT;
1063         dev->netdev_ops         = &macvlan_netdev_ops;
1064         dev->destructor         = free_netdev;
1065         dev->header_ops         = &macvlan_hard_header_ops;
1066         dev->ethtool_ops        = &macvlan_ethtool_ops;
1067 }
1068 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1069 
1070 static void macvlan_setup(struct net_device *dev)
1071 {
1072         macvlan_common_setup(dev);
1073         dev->priv_flags |= IFF_NO_QUEUE;
1074 }
1075 
1076 static int macvlan_port_create(struct net_device *dev)
1077 {
1078         struct macvlan_port *port;
1079         unsigned int i;
1080         int err;
1081 
1082         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1083                 return -EINVAL;
1084 
1085         if (netif_is_ipvlan_port(dev))
1086                 return -EBUSY;
1087 
1088         port = kzalloc(sizeof(*port), GFP_KERNEL);
1089         if (port == NULL)
1090                 return -ENOMEM;
1091 
1092         port->passthru = false;
1093         port->dev = dev;
1094         INIT_LIST_HEAD(&port->vlans);
1095         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1096                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1097         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1098                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1099 
1100         skb_queue_head_init(&port->bc_queue);
1101         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1102 
1103         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1104         if (err)
1105                 kfree(port);
1106         else
1107                 dev->priv_flags |= IFF_MACVLAN_PORT;
1108         return err;
1109 }
1110 
1111 static void macvlan_port_destroy(struct net_device *dev)
1112 {
1113         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1114 
1115         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1116         netdev_rx_handler_unregister(dev);
1117 
1118         /* After this point, no packet can schedule bc_work anymore,
1119          * but we need to cancel it and purge left skbs if any.
1120          */
1121         cancel_work_sync(&port->bc_work);
1122         __skb_queue_purge(&port->bc_queue);
1123 
1124         kfree_rcu(port, rcu);
1125 }
1126 
1127 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1128 {
1129         if (tb[IFLA_ADDRESS]) {
1130                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1131                         return -EINVAL;
1132                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1133                         return -EADDRNOTAVAIL;
1134         }
1135 
1136         if (data && data[IFLA_MACVLAN_FLAGS] &&
1137             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1138                 return -EINVAL;
1139 
1140         if (data && data[IFLA_MACVLAN_MODE]) {
1141                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1142                 case MACVLAN_MODE_PRIVATE:
1143                 case MACVLAN_MODE_VEPA:
1144                 case MACVLAN_MODE_BRIDGE:
1145                 case MACVLAN_MODE_PASSTHRU:
1146                 case MACVLAN_MODE_SOURCE:
1147                         break;
1148                 default:
1149                         return -EINVAL;
1150                 }
1151         }
1152 
1153         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1154                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1155                 case MACVLAN_MACADDR_ADD:
1156                 case MACVLAN_MACADDR_DEL:
1157                 case MACVLAN_MACADDR_FLUSH:
1158                 case MACVLAN_MACADDR_SET:
1159                         break;
1160                 default:
1161                         return -EINVAL;
1162                 }
1163         }
1164 
1165         if (data && data[IFLA_MACVLAN_MACADDR]) {
1166                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1167                         return -EINVAL;
1168 
1169                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1170                         return -EADDRNOTAVAIL;
1171         }
1172 
1173         if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1174                 return -EINVAL;
1175 
1176         return 0;
1177 }
1178 
1179 /**
1180  * reconfigure list of remote source mac address
1181  * (only for macvlan devices in source mode)
1182  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1183  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1184  */
1185 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1186                                       struct nlattr *data[])
1187 {
1188         char *addr = NULL;
1189         int ret, rem, len;
1190         struct nlattr *nla, *head;
1191         struct macvlan_source_entry *entry;
1192 
1193         if (data[IFLA_MACVLAN_MACADDR])
1194                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1195 
1196         if (mode == MACVLAN_MACADDR_ADD) {
1197                 if (!addr)
1198                         return -EINVAL;
1199 
1200                 return macvlan_hash_add_source(vlan, addr);
1201 
1202         } else if (mode == MACVLAN_MACADDR_DEL) {
1203                 if (!addr)
1204                         return -EINVAL;
1205 
1206                 entry = macvlan_hash_lookup_source(vlan, addr);
1207                 if (entry) {
1208                         macvlan_hash_del_source(entry);
1209                         vlan->macaddr_count--;
1210                 }
1211         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1212                 macvlan_flush_sources(vlan->port, vlan);
1213         } else if (mode == MACVLAN_MACADDR_SET) {
1214                 macvlan_flush_sources(vlan->port, vlan);
1215 
1216                 if (addr) {
1217                         ret = macvlan_hash_add_source(vlan, addr);
1218                         if (ret)
1219                                 return ret;
1220                 }
1221 
1222                 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1223                         return 0;
1224 
1225                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1226                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1227 
1228                 nla_for_each_attr(nla, head, len, rem) {
1229                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1230                             nla_len(nla) != ETH_ALEN)
1231                                 continue;
1232 
1233                         addr = nla_data(nla);
1234                         ret = macvlan_hash_add_source(vlan, addr);
1235                         if (ret)
1236                                 return ret;
1237                 }
1238         } else {
1239                 return -EINVAL;
1240         }
1241 
1242         return 0;
1243 }
1244 
1245 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1246                            struct nlattr *tb[], struct nlattr *data[])
1247 {
1248         struct macvlan_dev *vlan = netdev_priv(dev);
1249         struct macvlan_port *port;
1250         struct net_device *lowerdev;
1251         int err;
1252         int macmode;
1253 
1254         if (!tb[IFLA_LINK])
1255                 return -EINVAL;
1256 
1257         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1258         if (lowerdev == NULL)
1259                 return -ENODEV;
1260 
1261         /* When creating macvlans or macvtaps on top of other macvlans - use
1262          * the real device as the lowerdev.
1263          */
1264         if (netif_is_macvlan(lowerdev))
1265                 lowerdev = macvlan_dev_real_dev(lowerdev);
1266 
1267         if (!tb[IFLA_MTU])
1268                 dev->mtu = lowerdev->mtu;
1269         else if (dev->mtu > lowerdev->mtu)
1270                 return -EINVAL;
1271 
1272         if (!tb[IFLA_ADDRESS])
1273                 eth_hw_addr_random(dev);
1274 
1275         if (!macvlan_port_exists(lowerdev)) {
1276                 err = macvlan_port_create(lowerdev);
1277                 if (err < 0)
1278                         return err;
1279         }
1280         port = macvlan_port_get_rtnl(lowerdev);
1281 
1282         /* Only 1 macvlan device can be created in passthru mode */
1283         if (port->passthru)
1284                 return -EINVAL;
1285 
1286         vlan->lowerdev = lowerdev;
1287         vlan->dev      = dev;
1288         vlan->port     = port;
1289         vlan->set_features = MACVLAN_FEATURES;
1290         vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1291 
1292         vlan->mode     = MACVLAN_MODE_VEPA;
1293         if (data && data[IFLA_MACVLAN_MODE])
1294                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1295 
1296         if (data && data[IFLA_MACVLAN_FLAGS])
1297                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1298 
1299         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1300                 if (port->count)
1301                         return -EINVAL;
1302                 port->passthru = true;
1303                 eth_hw_addr_inherit(dev, lowerdev);
1304         }
1305 
1306         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1307                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1308                         return -EINVAL;
1309                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1310                 err = macvlan_changelink_sources(vlan, macmode, data);
1311                 if (err)
1312                         return err;
1313         }
1314 
1315         port->count += 1;
1316         err = register_netdevice(dev);
1317         if (err < 0)
1318                 goto destroy_port;
1319 
1320         dev->priv_flags |= IFF_MACVLAN;
1321         err = netdev_upper_dev_link(lowerdev, dev);
1322         if (err)
1323                 goto unregister_netdev;
1324 
1325         list_add_tail_rcu(&vlan->list, &port->vlans);
1326         netif_stacked_transfer_operstate(lowerdev, dev);
1327         linkwatch_fire_event(dev);
1328 
1329         return 0;
1330 
1331 unregister_netdev:
1332         unregister_netdevice(dev);
1333 destroy_port:
1334         port->count -= 1;
1335         if (!port->count)
1336                 macvlan_port_destroy(lowerdev);
1337 
1338         return err;
1339 }
1340 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1341 
1342 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1343                            struct nlattr *tb[], struct nlattr *data[])
1344 {
1345         return macvlan_common_newlink(src_net, dev, tb, data);
1346 }
1347 
1348 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1349 {
1350         struct macvlan_dev *vlan = netdev_priv(dev);
1351 
1352         if (vlan->mode == MACVLAN_MODE_SOURCE)
1353                 macvlan_flush_sources(vlan->port, vlan);
1354         list_del_rcu(&vlan->list);
1355         unregister_netdevice_queue(dev, head);
1356         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1357 }
1358 EXPORT_SYMBOL_GPL(macvlan_dellink);
1359 
1360 static int macvlan_changelink(struct net_device *dev,
1361                 struct nlattr *tb[], struct nlattr *data[])
1362 {
1363         struct macvlan_dev *vlan = netdev_priv(dev);
1364         enum macvlan_mode mode;
1365         bool set_mode = false;
1366         enum macvlan_macaddr_mode macmode;
1367         int ret;
1368 
1369         /* Validate mode, but don't set yet: setting flags may fail. */
1370         if (data && data[IFLA_MACVLAN_MODE]) {
1371                 set_mode = true;
1372                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1373                 /* Passthrough mode can't be set or cleared dynamically */
1374                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1375                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1376                         return -EINVAL;
1377                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1378                     vlan->mode != mode)
1379                         macvlan_flush_sources(vlan->port, vlan);
1380         }
1381 
1382         if (data && data[IFLA_MACVLAN_FLAGS]) {
1383                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1384                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1385                 if (vlan->port->passthru && promisc) {
1386                         int err;
1387 
1388                         if (flags & MACVLAN_FLAG_NOPROMISC)
1389                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1390                         else
1391                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1392                         if (err < 0)
1393                                 return err;
1394                 }
1395                 vlan->flags = flags;
1396         }
1397         if (set_mode)
1398                 vlan->mode = mode;
1399         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1400                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1401                         return -EINVAL;
1402                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1403                 ret = macvlan_changelink_sources(vlan, macmode, data);
1404                 if (ret)
1405                         return ret;
1406         }
1407         return 0;
1408 }
1409 
1410 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1411 {
1412         if (vlan->macaddr_count == 0)
1413                 return 0;
1414         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1415                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1416 }
1417 
1418 static size_t macvlan_get_size(const struct net_device *dev)
1419 {
1420         struct macvlan_dev *vlan = netdev_priv(dev);
1421 
1422         return (0
1423                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1424                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1425                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1426                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1427                 );
1428 }
1429 
1430 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1431                                      const struct macvlan_dev *vlan,
1432                                      const int i)
1433 {
1434         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1435         struct macvlan_source_entry *entry;
1436 
1437         hlist_for_each_entry_rcu(entry, h, hlist) {
1438                 if (entry->vlan != vlan)
1439                         continue;
1440                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1441                         return 1;
1442         }
1443         return 0;
1444 }
1445 
1446 static int macvlan_fill_info(struct sk_buff *skb,
1447                                 const struct net_device *dev)
1448 {
1449         struct macvlan_dev *vlan = netdev_priv(dev);
1450         int i;
1451         struct nlattr *nest;
1452 
1453         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1454                 goto nla_put_failure;
1455         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1456                 goto nla_put_failure;
1457         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1458                 goto nla_put_failure;
1459         if (vlan->macaddr_count > 0) {
1460                 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1461                 if (nest == NULL)
1462                         goto nla_put_failure;
1463 
1464                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1465                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1466                                 goto nla_put_failure;
1467                 }
1468                 nla_nest_end(skb, nest);
1469         }
1470         return 0;
1471 
1472 nla_put_failure:
1473         return -EMSGSIZE;
1474 }
1475 
1476 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1477         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1478         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1479         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1480         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1481         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1482         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1483 };
1484 
1485 int macvlan_link_register(struct rtnl_link_ops *ops)
1486 {
1487         /* common fields */
1488         ops->priv_size          = sizeof(struct macvlan_dev);
1489         ops->validate           = macvlan_validate;
1490         ops->maxtype            = IFLA_MACVLAN_MAX;
1491         ops->policy             = macvlan_policy;
1492         ops->changelink         = macvlan_changelink;
1493         ops->get_size           = macvlan_get_size;
1494         ops->fill_info          = macvlan_fill_info;
1495 
1496         return rtnl_link_register(ops);
1497 };
1498 EXPORT_SYMBOL_GPL(macvlan_link_register);
1499 
1500 static struct net *macvlan_get_link_net(const struct net_device *dev)
1501 {
1502         return dev_net(macvlan_dev_real_dev(dev));
1503 }
1504 
1505 static struct rtnl_link_ops macvlan_link_ops = {
1506         .kind           = "macvlan",
1507         .setup          = macvlan_setup,
1508         .newlink        = macvlan_newlink,
1509         .dellink        = macvlan_dellink,
1510         .get_link_net   = macvlan_get_link_net,
1511 };
1512 
1513 static int macvlan_device_event(struct notifier_block *unused,
1514                                 unsigned long event, void *ptr)
1515 {
1516         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1517         struct macvlan_dev *vlan, *next;
1518         struct macvlan_port *port;
1519         LIST_HEAD(list_kill);
1520 
1521         if (!macvlan_port_exists(dev))
1522                 return NOTIFY_DONE;
1523 
1524         port = macvlan_port_get_rtnl(dev);
1525 
1526         switch (event) {
1527         case NETDEV_UP:
1528         case NETDEV_CHANGE:
1529                 list_for_each_entry(vlan, &port->vlans, list)
1530                         netif_stacked_transfer_operstate(vlan->lowerdev,
1531                                                          vlan->dev);
1532                 break;
1533         case NETDEV_FEAT_CHANGE:
1534                 list_for_each_entry(vlan, &port->vlans, list) {
1535                         vlan->dev->gso_max_size = dev->gso_max_size;
1536                         vlan->dev->gso_max_segs = dev->gso_max_segs;
1537                         netdev_update_features(vlan->dev);
1538                 }
1539                 break;
1540         case NETDEV_CHANGEMTU:
1541                 list_for_each_entry(vlan, &port->vlans, list) {
1542                         if (vlan->dev->mtu <= dev->mtu)
1543                                 continue;
1544                         dev_set_mtu(vlan->dev, dev->mtu);
1545                 }
1546                 break;
1547         case NETDEV_CHANGEADDR:
1548                 if (!port->passthru)
1549                         return NOTIFY_DONE;
1550 
1551                 vlan = list_first_entry_or_null(&port->vlans,
1552                                                 struct macvlan_dev,
1553                                                 list);
1554 
1555                 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1556                         return NOTIFY_BAD;
1557 
1558                 break;
1559         case NETDEV_UNREGISTER:
1560                 /* twiddle thumbs on netns device moves */
1561                 if (dev->reg_state != NETREG_UNREGISTERING)
1562                         break;
1563 
1564                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1565                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1566                 unregister_netdevice_many(&list_kill);
1567                 break;
1568         case NETDEV_PRE_TYPE_CHANGE:
1569                 /* Forbid underlaying device to change its type. */
1570                 return NOTIFY_BAD;
1571 
1572         case NETDEV_NOTIFY_PEERS:
1573         case NETDEV_BONDING_FAILOVER:
1574         case NETDEV_RESEND_IGMP:
1575                 /* Propagate to all vlans */
1576                 list_for_each_entry(vlan, &port->vlans, list)
1577                         call_netdevice_notifiers(event, vlan->dev);
1578         }
1579         return NOTIFY_DONE;
1580 }
1581 
1582 static struct notifier_block macvlan_notifier_block __read_mostly = {
1583         .notifier_call  = macvlan_device_event,
1584 };
1585 
1586 static int __init macvlan_init_module(void)
1587 {
1588         int err;
1589 
1590         register_netdevice_notifier(&macvlan_notifier_block);
1591 
1592         err = macvlan_link_register(&macvlan_link_ops);
1593         if (err < 0)
1594                 goto err1;
1595         return 0;
1596 err1:
1597         unregister_netdevice_notifier(&macvlan_notifier_block);
1598         return err;
1599 }
1600 
1601 static void __exit macvlan_cleanup_module(void)
1602 {
1603         rtnl_link_unregister(&macvlan_link_ops);
1604         unregister_netdevice_notifier(&macvlan_notifier_block);
1605 }
1606 
1607 module_init(macvlan_init_module);
1608 module_exit(macvlan_cleanup_module);
1609 
1610 MODULE_LICENSE("GPL");
1611 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1612 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1613 MODULE_ALIAS_RTNL_LINK("macvlan");
1614 

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