Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

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 sk_buff_head     bc_queue;
 47         struct work_struct      bc_work;
 48         bool                    passthru;
 49         int                     count;
 50         struct hlist_head       vlan_source_hash[MACVLAN_HASH_SIZE];
 51         DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
 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 bool 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 true;
190 
191         if (macvlan_hash_lookup(port, addr))
192                 return true;
193 
194         return false;
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                 if (src)
309                         dev_put(src->dev);
310                 kfree_skb(skb);
311         }
312 }
313 
314 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
315                                       const struct macvlan_dev *src,
316                                       struct sk_buff *skb)
317 {
318         struct sk_buff *nskb;
319         int err = -ENOMEM;
320 
321         nskb = skb_clone(skb, GFP_ATOMIC);
322         if (!nskb)
323                 goto err;
324 
325         MACVLAN_SKB_CB(nskb)->src = src;
326 
327         spin_lock(&port->bc_queue.lock);
328         if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
329                 if (src)
330                         dev_hold(src->dev);
331                 __skb_queue_tail(&port->bc_queue, nskb);
332                 err = 0;
333         }
334         spin_unlock(&port->bc_queue.lock);
335 
336         if (err)
337                 goto free_nskb;
338 
339         schedule_work(&port->bc_work);
340         return;
341 
342 free_nskb:
343         kfree_skb(nskb);
344 err:
345         atomic_long_inc(&skb->dev->rx_dropped);
346 }
347 
348 static void macvlan_flush_sources(struct macvlan_port *port,
349                                   struct macvlan_dev *vlan)
350 {
351         int i;
352 
353         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
354                 struct hlist_node *h, *n;
355 
356                 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
357                         struct macvlan_source_entry *entry;
358 
359                         entry = hlist_entry(h, struct macvlan_source_entry,
360                                             hlist);
361                         if (entry->vlan == vlan)
362                                 macvlan_hash_del_source(entry);
363                 }
364         }
365         vlan->macaddr_count = 0;
366 }
367 
368 static void macvlan_forward_source_one(struct sk_buff *skb,
369                                        struct macvlan_dev *vlan)
370 {
371         struct sk_buff *nskb;
372         struct net_device *dev;
373         int len;
374         int ret;
375 
376         dev = vlan->dev;
377         if (unlikely(!(dev->flags & IFF_UP)))
378                 return;
379 
380         nskb = skb_clone(skb, GFP_ATOMIC);
381         if (!nskb)
382                 return;
383 
384         len = nskb->len + ETH_HLEN;
385         nskb->dev = dev;
386         nskb->pkt_type = PACKET_HOST;
387 
388         ret = netif_rx(nskb);
389         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
390 }
391 
392 static void macvlan_forward_source(struct sk_buff *skb,
393                                    struct macvlan_port *port,
394                                    const unsigned char *addr)
395 {
396         struct macvlan_source_entry *entry;
397         u32 idx = macvlan_eth_hash(addr);
398         struct hlist_head *h = &port->vlan_source_hash[idx];
399 
400         hlist_for_each_entry_rcu(entry, h, hlist) {
401                 if (ether_addr_equal_64bits(entry->addr, addr))
402                         macvlan_forward_source_one(skb, entry->vlan);
403         }
404 }
405 
406 /* called under rcu_read_lock() from netif_receive_skb */
407 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
408 {
409         struct macvlan_port *port;
410         struct sk_buff *skb = *pskb;
411         const struct ethhdr *eth = eth_hdr(skb);
412         const struct macvlan_dev *vlan;
413         const struct macvlan_dev *src;
414         struct net_device *dev;
415         unsigned int len = 0;
416         int ret;
417         rx_handler_result_t handle_res;
418 
419         port = macvlan_port_get_rcu(skb->dev);
420         if (is_multicast_ether_addr(eth->h_dest)) {
421                 unsigned int hash;
422 
423                 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
424                 if (!skb)
425                         return RX_HANDLER_CONSUMED;
426                 *pskb = skb;
427                 eth = eth_hdr(skb);
428                 macvlan_forward_source(skb, port, eth->h_source);
429                 src = macvlan_hash_lookup(port, eth->h_source);
430                 if (src && src->mode != MACVLAN_MODE_VEPA &&
431                     src->mode != MACVLAN_MODE_BRIDGE) {
432                         /* forward to original port. */
433                         vlan = src;
434                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
435                               netif_rx(skb);
436                         handle_res = RX_HANDLER_CONSUMED;
437                         goto out;
438                 }
439 
440                 hash = mc_hash(NULL, eth->h_dest);
441                 if (test_bit(hash, port->mc_filter))
442                         macvlan_broadcast_enqueue(port, src, skb);
443 
444                 return RX_HANDLER_PASS;
445         }
446 
447         macvlan_forward_source(skb, port, eth->h_source);
448         if (port->passthru)
449                 vlan = list_first_or_null_rcu(&port->vlans,
450                                               struct macvlan_dev, list);
451         else
452                 vlan = macvlan_hash_lookup(port, eth->h_dest);
453         if (vlan == NULL)
454                 return RX_HANDLER_PASS;
455 
456         dev = vlan->dev;
457         if (unlikely(!(dev->flags & IFF_UP))) {
458                 kfree_skb(skb);
459                 return RX_HANDLER_CONSUMED;
460         }
461         len = skb->len + ETH_HLEN;
462         skb = skb_share_check(skb, GFP_ATOMIC);
463         if (!skb) {
464                 ret = NET_RX_DROP;
465                 handle_res = RX_HANDLER_CONSUMED;
466                 goto out;
467         }
468 
469         *pskb = skb;
470         skb->dev = dev;
471         skb->pkt_type = PACKET_HOST;
472 
473         ret = NET_RX_SUCCESS;
474         handle_res = RX_HANDLER_ANOTHER;
475 out:
476         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
477         return handle_res;
478 }
479 
480 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
481 {
482         const struct macvlan_dev *vlan = netdev_priv(dev);
483         const struct macvlan_port *port = vlan->port;
484         const struct macvlan_dev *dest;
485 
486         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
487                 const struct ethhdr *eth = (void *)skb->data;
488 
489                 /* send to other bridge ports directly */
490                 if (is_multicast_ether_addr(eth->h_dest)) {
491                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
492                         goto xmit_world;
493                 }
494 
495                 dest = macvlan_hash_lookup(port, eth->h_dest);
496                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
497                         /* send to lowerdev first for its network taps */
498                         dev_forward_skb(vlan->lowerdev, skb);
499 
500                         return NET_XMIT_SUCCESS;
501                 }
502         }
503 
504 xmit_world:
505         skb->dev = vlan->lowerdev;
506         return dev_queue_xmit(skb);
507 }
508 
509 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
510 {
511 #ifdef CONFIG_NET_POLL_CONTROLLER
512         if (vlan->netpoll)
513                 netpoll_send_skb(vlan->netpoll, skb);
514 #else
515         BUG();
516 #endif
517         return NETDEV_TX_OK;
518 }
519 
520 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
521                                       struct net_device *dev)
522 {
523         unsigned int len = skb->len;
524         int ret;
525         struct macvlan_dev *vlan = netdev_priv(dev);
526 
527         if (unlikely(netpoll_tx_running(dev)))
528                 return macvlan_netpoll_send_skb(vlan, skb);
529 
530         if (vlan->fwd_priv) {
531                 skb->dev = vlan->lowerdev;
532                 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
533         } else {
534                 ret = macvlan_queue_xmit(skb, dev);
535         }
536 
537         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
538                 struct vlan_pcpu_stats *pcpu_stats;
539 
540                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
541                 u64_stats_update_begin(&pcpu_stats->syncp);
542                 pcpu_stats->tx_packets++;
543                 pcpu_stats->tx_bytes += len;
544                 u64_stats_update_end(&pcpu_stats->syncp);
545         } else {
546                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
547         }
548         return ret;
549 }
550 
551 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
552                                unsigned short type, const void *daddr,
553                                const void *saddr, unsigned len)
554 {
555         const struct macvlan_dev *vlan = netdev_priv(dev);
556         struct net_device *lowerdev = vlan->lowerdev;
557 
558         return dev_hard_header(skb, lowerdev, type, daddr,
559                                saddr ? : dev->dev_addr, len);
560 }
561 
562 static const struct header_ops macvlan_hard_header_ops = {
563         .create         = macvlan_hard_header,
564         .parse          = eth_header_parse,
565         .cache          = eth_header_cache,
566         .cache_update   = eth_header_cache_update,
567 };
568 
569 static struct rtnl_link_ops macvlan_link_ops;
570 
571 static int macvlan_open(struct net_device *dev)
572 {
573         struct macvlan_dev *vlan = netdev_priv(dev);
574         struct net_device *lowerdev = vlan->lowerdev;
575         int err;
576 
577         if (vlan->port->passthru) {
578                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
579                         err = dev_set_promiscuity(lowerdev, 1);
580                         if (err < 0)
581                                 goto out;
582                 }
583                 goto hash_add;
584         }
585 
586         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
587             dev->rtnl_link_ops == &macvlan_link_ops) {
588                 vlan->fwd_priv =
589                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
590 
591                 /* If we get a NULL pointer back, or if we get an error
592                  * then we should just fall through to the non accelerated path
593                  */
594                 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
595                         vlan->fwd_priv = NULL;
596                 } else
597                         return 0;
598         }
599 
600         err = -EBUSY;
601         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
602                 goto out;
603 
604         err = dev_uc_add(lowerdev, dev->dev_addr);
605         if (err < 0)
606                 goto out;
607         if (dev->flags & IFF_ALLMULTI) {
608                 err = dev_set_allmulti(lowerdev, 1);
609                 if (err < 0)
610                         goto del_unicast;
611         }
612 
613         if (dev->flags & IFF_PROMISC) {
614                 err = dev_set_promiscuity(lowerdev, 1);
615                 if (err < 0)
616                         goto clear_multi;
617         }
618 
619 hash_add:
620         macvlan_hash_add(vlan);
621         return 0;
622 
623 clear_multi:
624         if (dev->flags & IFF_ALLMULTI)
625                 dev_set_allmulti(lowerdev, -1);
626 del_unicast:
627         dev_uc_del(lowerdev, dev->dev_addr);
628 out:
629         if (vlan->fwd_priv) {
630                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
631                                                            vlan->fwd_priv);
632                 vlan->fwd_priv = NULL;
633         }
634         return err;
635 }
636 
637 static int macvlan_stop(struct net_device *dev)
638 {
639         struct macvlan_dev *vlan = netdev_priv(dev);
640         struct net_device *lowerdev = vlan->lowerdev;
641 
642         if (vlan->fwd_priv) {
643                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
644                                                            vlan->fwd_priv);
645                 vlan->fwd_priv = NULL;
646                 return 0;
647         }
648 
649         dev_uc_unsync(lowerdev, dev);
650         dev_mc_unsync(lowerdev, dev);
651 
652         if (vlan->port->passthru) {
653                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
654                         dev_set_promiscuity(lowerdev, -1);
655                 goto hash_del;
656         }
657 
658         if (dev->flags & IFF_ALLMULTI)
659                 dev_set_allmulti(lowerdev, -1);
660 
661         if (dev->flags & IFF_PROMISC)
662                 dev_set_promiscuity(lowerdev, -1);
663 
664         dev_uc_del(lowerdev, dev->dev_addr);
665 
666 hash_del:
667         macvlan_hash_del(vlan, !dev->dismantle);
668         return 0;
669 }
670 
671 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
672 {
673         struct macvlan_dev *vlan = netdev_priv(dev);
674         struct net_device *lowerdev = vlan->lowerdev;
675         int err;
676 
677         if (!(dev->flags & IFF_UP)) {
678                 /* Just copy in the new address */
679                 ether_addr_copy(dev->dev_addr, addr);
680         } else {
681                 /* Rehash and update the device filters */
682                 if (macvlan_addr_busy(vlan->port, addr))
683                         return -EBUSY;
684 
685                 if (!vlan->port->passthru) {
686                         err = dev_uc_add(lowerdev, addr);
687                         if (err)
688                                 return err;
689 
690                         dev_uc_del(lowerdev, dev->dev_addr);
691                 }
692 
693                 macvlan_hash_change_addr(vlan, addr);
694         }
695         return 0;
696 }
697 
698 static int macvlan_set_mac_address(struct net_device *dev, void *p)
699 {
700         struct macvlan_dev *vlan = netdev_priv(dev);
701         struct sockaddr *addr = p;
702 
703         if (!is_valid_ether_addr(addr->sa_data))
704                 return -EADDRNOTAVAIL;
705 
706         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
707                 dev_set_mac_address(vlan->lowerdev, addr);
708                 return 0;
709         }
710 
711         return macvlan_sync_address(dev, addr->sa_data);
712 }
713 
714 static void macvlan_change_rx_flags(struct net_device *dev, int change)
715 {
716         struct macvlan_dev *vlan = netdev_priv(dev);
717         struct net_device *lowerdev = vlan->lowerdev;
718 
719         if (dev->flags & IFF_UP) {
720                 if (change & IFF_ALLMULTI)
721                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
722                 if (change & IFF_PROMISC)
723                         dev_set_promiscuity(lowerdev,
724                                             dev->flags & IFF_PROMISC ? 1 : -1);
725 
726         }
727 }
728 
729 static void macvlan_compute_filter(unsigned long *mc_filter,
730                                    struct net_device *dev,
731                                    struct macvlan_dev *vlan)
732 {
733         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
734                 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
735         } else {
736                 struct netdev_hw_addr *ha;
737                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
738 
739                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
740                 netdev_for_each_mc_addr(ha, dev) {
741                         __set_bit(mc_hash(vlan, ha->addr), filter);
742                 }
743 
744                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
745 
746                 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
747         }
748 }
749 
750 static void macvlan_set_mac_lists(struct net_device *dev)
751 {
752         struct macvlan_dev *vlan = netdev_priv(dev);
753 
754         macvlan_compute_filter(vlan->mc_filter, dev, vlan);
755 
756         dev_uc_sync(vlan->lowerdev, dev);
757         dev_mc_sync(vlan->lowerdev, dev);
758 
759         /* This is slightly inaccurate as we're including the subscription
760          * list of vlan->lowerdev too.
761          *
762          * Bug alert: This only works if everyone has the same broadcast
763          * address as lowerdev.  As soon as someone changes theirs this
764          * will break.
765          *
766          * However, this is already broken as when you change your broadcast
767          * address we don't get called.
768          *
769          * The solution is to maintain a list of broadcast addresses like
770          * we do for uc/mc, if you care.
771          */
772         macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
773 }
774 
775 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
776 {
777         struct macvlan_dev *vlan = netdev_priv(dev);
778 
779         if (vlan->lowerdev->mtu < new_mtu)
780                 return -EINVAL;
781         dev->mtu = new_mtu;
782         return 0;
783 }
784 
785 /*
786  * macvlan network devices have devices nesting below it and are a special
787  * "super class" of normal network devices; split their locks off into a
788  * separate class since they always nest.
789  */
790 static struct lock_class_key macvlan_netdev_addr_lock_key;
791 
792 #define ALWAYS_ON_FEATURES \
793         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \
794          NETIF_F_GSO_ROBUST)
795 
796 #define MACVLAN_FEATURES \
797         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
798          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \
799          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
800          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
801 
802 #define MACVLAN_STATE_MASK \
803         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
804 
805 static int macvlan_get_nest_level(struct net_device *dev)
806 {
807         return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
808 }
809 
810 static void macvlan_set_lockdep_class(struct net_device *dev)
811 {
812         netdev_lockdep_set_classes(dev);
813         lockdep_set_class_and_subclass(&dev->addr_list_lock,
814                                        &macvlan_netdev_addr_lock_key,
815                                        macvlan_get_nest_level(dev));
816 }
817 
818 static int macvlan_init(struct net_device *dev)
819 {
820         struct macvlan_dev *vlan = netdev_priv(dev);
821         const struct net_device *lowerdev = vlan->lowerdev;
822         struct macvlan_port *port = vlan->port;
823 
824         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
825                                   (lowerdev->state & MACVLAN_STATE_MASK);
826         dev->features           = lowerdev->features & MACVLAN_FEATURES;
827         dev->features           |= ALWAYS_ON_FEATURES;
828         dev->hw_features        |= NETIF_F_LRO;
829         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
830         dev->gso_max_size       = lowerdev->gso_max_size;
831         dev->gso_max_segs       = lowerdev->gso_max_segs;
832         dev->hard_header_len    = lowerdev->hard_header_len;
833 
834         macvlan_set_lockdep_class(dev);
835 
836         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
837         if (!vlan->pcpu_stats)
838                 return -ENOMEM;
839 
840         port->count += 1;
841 
842         return 0;
843 }
844 
845 static void macvlan_uninit(struct net_device *dev)
846 {
847         struct macvlan_dev *vlan = netdev_priv(dev);
848         struct macvlan_port *port = vlan->port;
849 
850         free_percpu(vlan->pcpu_stats);
851 
852         macvlan_flush_sources(port, vlan);
853         port->count -= 1;
854         if (!port->count)
855                 macvlan_port_destroy(port->dev);
856 }
857 
858 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
859                                                          struct rtnl_link_stats64 *stats)
860 {
861         struct macvlan_dev *vlan = netdev_priv(dev);
862 
863         if (vlan->pcpu_stats) {
864                 struct vlan_pcpu_stats *p;
865                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
866                 u32 rx_errors = 0, tx_dropped = 0;
867                 unsigned int start;
868                 int i;
869 
870                 for_each_possible_cpu(i) {
871                         p = per_cpu_ptr(vlan->pcpu_stats, i);
872                         do {
873                                 start = u64_stats_fetch_begin_irq(&p->syncp);
874                                 rx_packets      = p->rx_packets;
875                                 rx_bytes        = p->rx_bytes;
876                                 rx_multicast    = p->rx_multicast;
877                                 tx_packets      = p->tx_packets;
878                                 tx_bytes        = p->tx_bytes;
879                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
880 
881                         stats->rx_packets       += rx_packets;
882                         stats->rx_bytes         += rx_bytes;
883                         stats->multicast        += rx_multicast;
884                         stats->tx_packets       += tx_packets;
885                         stats->tx_bytes         += tx_bytes;
886                         /* rx_errors & tx_dropped are u32, updated
887                          * without syncp protection.
888                          */
889                         rx_errors       += p->rx_errors;
890                         tx_dropped      += p->tx_dropped;
891                 }
892                 stats->rx_errors        = rx_errors;
893                 stats->rx_dropped       = rx_errors;
894                 stats->tx_dropped       = tx_dropped;
895         }
896         return stats;
897 }
898 
899 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
900                                    __be16 proto, u16 vid)
901 {
902         struct macvlan_dev *vlan = netdev_priv(dev);
903         struct net_device *lowerdev = vlan->lowerdev;
904 
905         return vlan_vid_add(lowerdev, proto, vid);
906 }
907 
908 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
909                                     __be16 proto, u16 vid)
910 {
911         struct macvlan_dev *vlan = netdev_priv(dev);
912         struct net_device *lowerdev = vlan->lowerdev;
913 
914         vlan_vid_del(lowerdev, proto, vid);
915         return 0;
916 }
917 
918 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
919                            struct net_device *dev,
920                            const unsigned char *addr, u16 vid,
921                            u16 flags)
922 {
923         struct macvlan_dev *vlan = netdev_priv(dev);
924         int err = -EINVAL;
925 
926         /* Support unicast filter only on passthru devices.
927          * Multicast filter should be allowed on all devices.
928          */
929         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
930                 return -EOPNOTSUPP;
931 
932         if (flags & NLM_F_REPLACE)
933                 return -EOPNOTSUPP;
934 
935         if (is_unicast_ether_addr(addr))
936                 err = dev_uc_add_excl(dev, addr);
937         else if (is_multicast_ether_addr(addr))
938                 err = dev_mc_add_excl(dev, addr);
939 
940         return err;
941 }
942 
943 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
944                            struct net_device *dev,
945                            const unsigned char *addr, u16 vid)
946 {
947         struct macvlan_dev *vlan = netdev_priv(dev);
948         int err = -EINVAL;
949 
950         /* Support unicast filter only on passthru devices.
951          * Multicast filter should be allowed on all devices.
952          */
953         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
954                 return -EOPNOTSUPP;
955 
956         if (is_unicast_ether_addr(addr))
957                 err = dev_uc_del(dev, addr);
958         else if (is_multicast_ether_addr(addr))
959                 err = dev_mc_del(dev, addr);
960 
961         return err;
962 }
963 
964 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
965                                         struct ethtool_drvinfo *drvinfo)
966 {
967         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
968         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
969 }
970 
971 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
972                                               struct ethtool_link_ksettings *cmd)
973 {
974         const struct macvlan_dev *vlan = netdev_priv(dev);
975 
976         return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
977 }
978 
979 static netdev_features_t macvlan_fix_features(struct net_device *dev,
980                                               netdev_features_t features)
981 {
982         struct macvlan_dev *vlan = netdev_priv(dev);
983         netdev_features_t lowerdev_features = vlan->lowerdev->features;
984         netdev_features_t mask;
985 
986         features |= NETIF_F_ALL_FOR_ALL;
987         features &= (vlan->set_features | ~MACVLAN_FEATURES);
988         mask = features;
989 
990         lowerdev_features &= (features | ~NETIF_F_LRO);
991         features = netdev_increment_features(lowerdev_features, features, mask);
992         features |= ALWAYS_ON_FEATURES;
993         features &= ~NETIF_F_NETNS_LOCAL;
994 
995         return features;
996 }
997 
998 #ifdef CONFIG_NET_POLL_CONTROLLER
999 static void macvlan_dev_poll_controller(struct net_device *dev)
1000 {
1001         return;
1002 }
1003 
1004 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1005 {
1006         struct macvlan_dev *vlan = netdev_priv(dev);
1007         struct net_device *real_dev = vlan->lowerdev;
1008         struct netpoll *netpoll;
1009         int err = 0;
1010 
1011         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1012         err = -ENOMEM;
1013         if (!netpoll)
1014                 goto out;
1015 
1016         err = __netpoll_setup(netpoll, real_dev);
1017         if (err) {
1018                 kfree(netpoll);
1019                 goto out;
1020         }
1021 
1022         vlan->netpoll = netpoll;
1023 
1024 out:
1025         return err;
1026 }
1027 
1028 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1029 {
1030         struct macvlan_dev *vlan = netdev_priv(dev);
1031         struct netpoll *netpoll = vlan->netpoll;
1032 
1033         if (!netpoll)
1034                 return;
1035 
1036         vlan->netpoll = NULL;
1037 
1038         __netpoll_free_async(netpoll);
1039 }
1040 #endif  /* CONFIG_NET_POLL_CONTROLLER */
1041 
1042 static int macvlan_dev_get_iflink(const struct net_device *dev)
1043 {
1044         struct macvlan_dev *vlan = netdev_priv(dev);
1045 
1046         return vlan->lowerdev->ifindex;
1047 }
1048 
1049 static const struct ethtool_ops macvlan_ethtool_ops = {
1050         .get_link               = ethtool_op_get_link,
1051         .get_link_ksettings     = macvlan_ethtool_get_link_ksettings,
1052         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1053 };
1054 
1055 static const struct net_device_ops macvlan_netdev_ops = {
1056         .ndo_init               = macvlan_init,
1057         .ndo_uninit             = macvlan_uninit,
1058         .ndo_open               = macvlan_open,
1059         .ndo_stop               = macvlan_stop,
1060         .ndo_start_xmit         = macvlan_start_xmit,
1061         .ndo_change_mtu         = macvlan_change_mtu,
1062         .ndo_fix_features       = macvlan_fix_features,
1063         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1064         .ndo_set_mac_address    = macvlan_set_mac_address,
1065         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1066         .ndo_get_stats64        = macvlan_dev_get_stats64,
1067         .ndo_validate_addr      = eth_validate_addr,
1068         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1069         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1070         .ndo_fdb_add            = macvlan_fdb_add,
1071         .ndo_fdb_del            = macvlan_fdb_del,
1072         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1073         .ndo_get_lock_subclass  = macvlan_get_nest_level,
1074 #ifdef CONFIG_NET_POLL_CONTROLLER
1075         .ndo_poll_controller    = macvlan_dev_poll_controller,
1076         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1077         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1078 #endif
1079         .ndo_get_iflink         = macvlan_dev_get_iflink,
1080         .ndo_features_check     = passthru_features_check,
1081 };
1082 
1083 void macvlan_common_setup(struct net_device *dev)
1084 {
1085         ether_setup(dev);
1086 
1087         dev->min_mtu            = 0;
1088         dev->max_mtu            = ETH_MAX_MTU;
1089         dev->priv_flags        &= ~IFF_TX_SKB_SHARING;
1090         netif_keep_dst(dev);
1091         dev->priv_flags        |= IFF_UNICAST_FLT;
1092         dev->netdev_ops         = &macvlan_netdev_ops;
1093         dev->destructor         = free_netdev;
1094         dev->header_ops         = &macvlan_hard_header_ops;
1095         dev->ethtool_ops        = &macvlan_ethtool_ops;
1096 }
1097 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1098 
1099 static void macvlan_setup(struct net_device *dev)
1100 {
1101         macvlan_common_setup(dev);
1102         dev->priv_flags |= IFF_NO_QUEUE;
1103 }
1104 
1105 static int macvlan_port_create(struct net_device *dev)
1106 {
1107         struct macvlan_port *port;
1108         unsigned int i;
1109         int err;
1110 
1111         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1112                 return -EINVAL;
1113 
1114         if (netif_is_ipvlan_port(dev))
1115                 return -EBUSY;
1116 
1117         port = kzalloc(sizeof(*port), GFP_KERNEL);
1118         if (port == NULL)
1119                 return -ENOMEM;
1120 
1121         port->passthru = false;
1122         port->dev = dev;
1123         INIT_LIST_HEAD(&port->vlans);
1124         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1125                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1126         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1127                 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1128 
1129         skb_queue_head_init(&port->bc_queue);
1130         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1131 
1132         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1133         if (err)
1134                 kfree(port);
1135         else
1136                 dev->priv_flags |= IFF_MACVLAN_PORT;
1137         return err;
1138 }
1139 
1140 static void macvlan_port_destroy(struct net_device *dev)
1141 {
1142         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1143 
1144         dev->priv_flags &= ~IFF_MACVLAN_PORT;
1145         netdev_rx_handler_unregister(dev);
1146 
1147         /* After this point, no packet can schedule bc_work anymore,
1148          * but we need to cancel it and purge left skbs if any.
1149          */
1150         cancel_work_sync(&port->bc_work);
1151         __skb_queue_purge(&port->bc_queue);
1152 
1153         kfree(port);
1154 }
1155 
1156 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1157 {
1158         if (tb[IFLA_ADDRESS]) {
1159                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1160                         return -EINVAL;
1161                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1162                         return -EADDRNOTAVAIL;
1163         }
1164 
1165         if (data && data[IFLA_MACVLAN_FLAGS] &&
1166             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1167                 return -EINVAL;
1168 
1169         if (data && data[IFLA_MACVLAN_MODE]) {
1170                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1171                 case MACVLAN_MODE_PRIVATE:
1172                 case MACVLAN_MODE_VEPA:
1173                 case MACVLAN_MODE_BRIDGE:
1174                 case MACVLAN_MODE_PASSTHRU:
1175                 case MACVLAN_MODE_SOURCE:
1176                         break;
1177                 default:
1178                         return -EINVAL;
1179                 }
1180         }
1181 
1182         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1183                 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1184                 case MACVLAN_MACADDR_ADD:
1185                 case MACVLAN_MACADDR_DEL:
1186                 case MACVLAN_MACADDR_FLUSH:
1187                 case MACVLAN_MACADDR_SET:
1188                         break;
1189                 default:
1190                         return -EINVAL;
1191                 }
1192         }
1193 
1194         if (data && data[IFLA_MACVLAN_MACADDR]) {
1195                 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1196                         return -EINVAL;
1197 
1198                 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1199                         return -EADDRNOTAVAIL;
1200         }
1201 
1202         if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1203                 return -EINVAL;
1204 
1205         return 0;
1206 }
1207 
1208 /**
1209  * reconfigure list of remote source mac address
1210  * (only for macvlan devices in source mode)
1211  * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1212  * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1213  */
1214 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1215                                       struct nlattr *data[])
1216 {
1217         char *addr = NULL;
1218         int ret, rem, len;
1219         struct nlattr *nla, *head;
1220         struct macvlan_source_entry *entry;
1221 
1222         if (data[IFLA_MACVLAN_MACADDR])
1223                 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1224 
1225         if (mode == MACVLAN_MACADDR_ADD) {
1226                 if (!addr)
1227                         return -EINVAL;
1228 
1229                 return macvlan_hash_add_source(vlan, addr);
1230 
1231         } else if (mode == MACVLAN_MACADDR_DEL) {
1232                 if (!addr)
1233                         return -EINVAL;
1234 
1235                 entry = macvlan_hash_lookup_source(vlan, addr);
1236                 if (entry) {
1237                         macvlan_hash_del_source(entry);
1238                         vlan->macaddr_count--;
1239                 }
1240         } else if (mode == MACVLAN_MACADDR_FLUSH) {
1241                 macvlan_flush_sources(vlan->port, vlan);
1242         } else if (mode == MACVLAN_MACADDR_SET) {
1243                 macvlan_flush_sources(vlan->port, vlan);
1244 
1245                 if (addr) {
1246                         ret = macvlan_hash_add_source(vlan, addr);
1247                         if (ret)
1248                                 return ret;
1249                 }
1250 
1251                 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1252                         return 0;
1253 
1254                 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1255                 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1256 
1257                 nla_for_each_attr(nla, head, len, rem) {
1258                         if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1259                             nla_len(nla) != ETH_ALEN)
1260                                 continue;
1261 
1262                         addr = nla_data(nla);
1263                         ret = macvlan_hash_add_source(vlan, addr);
1264                         if (ret)
1265                                 return ret;
1266                 }
1267         } else {
1268                 return -EINVAL;
1269         }
1270 
1271         return 0;
1272 }
1273 
1274 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1275                            struct nlattr *tb[], struct nlattr *data[])
1276 {
1277         struct macvlan_dev *vlan = netdev_priv(dev);
1278         struct macvlan_port *port;
1279         struct net_device *lowerdev;
1280         int err;
1281         int macmode;
1282         bool create = false;
1283 
1284         if (!tb[IFLA_LINK])
1285                 return -EINVAL;
1286 
1287         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1288         if (lowerdev == NULL)
1289                 return -ENODEV;
1290 
1291         /* When creating macvlans or macvtaps on top of other macvlans - use
1292          * the real device as the lowerdev.
1293          */
1294         if (netif_is_macvlan(lowerdev))
1295                 lowerdev = macvlan_dev_real_dev(lowerdev);
1296 
1297         if (!tb[IFLA_MTU])
1298                 dev->mtu = lowerdev->mtu;
1299         else if (dev->mtu > lowerdev->mtu)
1300                 return -EINVAL;
1301 
1302         /* MTU range: 68 - lowerdev->max_mtu */
1303         dev->min_mtu = ETH_MIN_MTU;
1304         dev->max_mtu = lowerdev->max_mtu;
1305 
1306         if (!tb[IFLA_ADDRESS])
1307                 eth_hw_addr_random(dev);
1308 
1309         if (!macvlan_port_exists(lowerdev)) {
1310                 err = macvlan_port_create(lowerdev);
1311                 if (err < 0)
1312                         return err;
1313                 create = true;
1314         }
1315         port = macvlan_port_get_rtnl(lowerdev);
1316 
1317         /* Only 1 macvlan device can be created in passthru mode */
1318         if (port->passthru) {
1319                 /* The macvlan port must be not created this time,
1320                  * still goto destroy_macvlan_port for readability.
1321                  */
1322                 err = -EINVAL;
1323                 goto destroy_macvlan_port;
1324         }
1325 
1326         vlan->lowerdev = lowerdev;
1327         vlan->dev      = dev;
1328         vlan->port     = port;
1329         vlan->set_features = MACVLAN_FEATURES;
1330         vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1331 
1332         vlan->mode     = MACVLAN_MODE_VEPA;
1333         if (data && data[IFLA_MACVLAN_MODE])
1334                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1335 
1336         if (data && data[IFLA_MACVLAN_FLAGS])
1337                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1338 
1339         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1340                 if (port->count) {
1341                         err = -EINVAL;
1342                         goto destroy_macvlan_port;
1343                 }
1344                 port->passthru = true;
1345                 eth_hw_addr_inherit(dev, lowerdev);
1346         }
1347 
1348         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1349                 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1350                         err = -EINVAL;
1351                         goto destroy_macvlan_port;
1352                 }
1353                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1354                 err = macvlan_changelink_sources(vlan, macmode, data);
1355                 if (err)
1356                         goto destroy_macvlan_port;
1357         }
1358 
1359         err = register_netdevice(dev);
1360         if (err < 0)
1361                 goto destroy_macvlan_port;
1362 
1363         dev->priv_flags |= IFF_MACVLAN;
1364         err = netdev_upper_dev_link(lowerdev, dev);
1365         if (err)
1366                 goto unregister_netdev;
1367 
1368         list_add_tail_rcu(&vlan->list, &port->vlans);
1369         netif_stacked_transfer_operstate(lowerdev, dev);
1370         linkwatch_fire_event(dev);
1371 
1372         return 0;
1373 
1374 unregister_netdev:
1375         unregister_netdevice(dev);
1376 destroy_macvlan_port:
1377         if (create)
1378                 macvlan_port_destroy(port->dev);
1379         return err;
1380 }
1381 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1382 
1383 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1384                            struct nlattr *tb[], struct nlattr *data[])
1385 {
1386         return macvlan_common_newlink(src_net, dev, tb, data);
1387 }
1388 
1389 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1390 {
1391         struct macvlan_dev *vlan = netdev_priv(dev);
1392 
1393         if (vlan->mode == MACVLAN_MODE_SOURCE)
1394                 macvlan_flush_sources(vlan->port, vlan);
1395         list_del_rcu(&vlan->list);
1396         unregister_netdevice_queue(dev, head);
1397         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1398 }
1399 EXPORT_SYMBOL_GPL(macvlan_dellink);
1400 
1401 static int macvlan_changelink(struct net_device *dev,
1402                 struct nlattr *tb[], struct nlattr *data[])
1403 {
1404         struct macvlan_dev *vlan = netdev_priv(dev);
1405         enum macvlan_mode mode;
1406         bool set_mode = false;
1407         enum macvlan_macaddr_mode macmode;
1408         int ret;
1409 
1410         /* Validate mode, but don't set yet: setting flags may fail. */
1411         if (data && data[IFLA_MACVLAN_MODE]) {
1412                 set_mode = true;
1413                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1414                 /* Passthrough mode can't be set or cleared dynamically */
1415                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1416                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1417                         return -EINVAL;
1418                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1419                     vlan->mode != mode)
1420                         macvlan_flush_sources(vlan->port, vlan);
1421         }
1422 
1423         if (data && data[IFLA_MACVLAN_FLAGS]) {
1424                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1425                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1426                 if (vlan->port->passthru && promisc) {
1427                         int err;
1428 
1429                         if (flags & MACVLAN_FLAG_NOPROMISC)
1430                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1431                         else
1432                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1433                         if (err < 0)
1434                                 return err;
1435                 }
1436                 vlan->flags = flags;
1437         }
1438         if (set_mode)
1439                 vlan->mode = mode;
1440         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1441                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1442                         return -EINVAL;
1443                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1444                 ret = macvlan_changelink_sources(vlan, macmode, data);
1445                 if (ret)
1446                         return ret;
1447         }
1448         return 0;
1449 }
1450 
1451 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1452 {
1453         if (vlan->macaddr_count == 0)
1454                 return 0;
1455         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1456                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1457 }
1458 
1459 static size_t macvlan_get_size(const struct net_device *dev)
1460 {
1461         struct macvlan_dev *vlan = netdev_priv(dev);
1462 
1463         return (0
1464                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1465                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1466                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1467                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1468                 );
1469 }
1470 
1471 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1472                                      const struct macvlan_dev *vlan,
1473                                      const int i)
1474 {
1475         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1476         struct macvlan_source_entry *entry;
1477 
1478         hlist_for_each_entry_rcu(entry, h, hlist) {
1479                 if (entry->vlan != vlan)
1480                         continue;
1481                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1482                         return 1;
1483         }
1484         return 0;
1485 }
1486 
1487 static int macvlan_fill_info(struct sk_buff *skb,
1488                                 const struct net_device *dev)
1489 {
1490         struct macvlan_dev *vlan = netdev_priv(dev);
1491         int i;
1492         struct nlattr *nest;
1493 
1494         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1495                 goto nla_put_failure;
1496         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1497                 goto nla_put_failure;
1498         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1499                 goto nla_put_failure;
1500         if (vlan->macaddr_count > 0) {
1501                 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1502                 if (nest == NULL)
1503                         goto nla_put_failure;
1504 
1505                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1506                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1507                                 goto nla_put_failure;
1508                 }
1509                 nla_nest_end(skb, nest);
1510         }
1511         return 0;
1512 
1513 nla_put_failure:
1514         return -EMSGSIZE;
1515 }
1516 
1517 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1518         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1519         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1520         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1521         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1522         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1523         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1524 };
1525 
1526 int macvlan_link_register(struct rtnl_link_ops *ops)
1527 {
1528         /* common fields */
1529         ops->priv_size          = sizeof(struct macvlan_dev);
1530         ops->validate           = macvlan_validate;
1531         ops->maxtype            = IFLA_MACVLAN_MAX;
1532         ops->policy             = macvlan_policy;
1533         ops->changelink         = macvlan_changelink;
1534         ops->get_size           = macvlan_get_size;
1535         ops->fill_info          = macvlan_fill_info;
1536 
1537         return rtnl_link_register(ops);
1538 };
1539 EXPORT_SYMBOL_GPL(macvlan_link_register);
1540 
1541 static struct net *macvlan_get_link_net(const struct net_device *dev)
1542 {
1543         return dev_net(macvlan_dev_real_dev(dev));
1544 }
1545 
1546 static struct rtnl_link_ops macvlan_link_ops = {
1547         .kind           = "macvlan",
1548         .setup          = macvlan_setup,
1549         .newlink        = macvlan_newlink,
1550         .dellink        = macvlan_dellink,
1551         .get_link_net   = macvlan_get_link_net,
1552 };
1553 
1554 static int macvlan_device_event(struct notifier_block *unused,
1555                                 unsigned long event, void *ptr)
1556 {
1557         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1558         struct macvlan_dev *vlan, *next;
1559         struct macvlan_port *port;
1560         LIST_HEAD(list_kill);
1561 
1562         if (!macvlan_port_exists(dev))
1563                 return NOTIFY_DONE;
1564 
1565         port = macvlan_port_get_rtnl(dev);
1566 
1567         switch (event) {
1568         case NETDEV_UP:
1569         case NETDEV_CHANGE:
1570                 list_for_each_entry(vlan, &port->vlans, list)
1571                         netif_stacked_transfer_operstate(vlan->lowerdev,
1572                                                          vlan->dev);
1573                 break;
1574         case NETDEV_FEAT_CHANGE:
1575                 list_for_each_entry(vlan, &port->vlans, list) {
1576                         vlan->dev->gso_max_size = dev->gso_max_size;
1577                         vlan->dev->gso_max_segs = dev->gso_max_segs;
1578                         netdev_update_features(vlan->dev);
1579                 }
1580                 break;
1581         case NETDEV_CHANGEMTU:
1582                 list_for_each_entry(vlan, &port->vlans, list) {
1583                         if (vlan->dev->mtu <= dev->mtu)
1584                                 continue;
1585                         dev_set_mtu(vlan->dev, dev->mtu);
1586                 }
1587                 break;
1588         case NETDEV_CHANGEADDR:
1589                 if (!port->passthru)
1590                         return NOTIFY_DONE;
1591 
1592                 vlan = list_first_entry_or_null(&port->vlans,
1593                                                 struct macvlan_dev,
1594                                                 list);
1595 
1596                 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1597                         return NOTIFY_BAD;
1598 
1599                 break;
1600         case NETDEV_UNREGISTER:
1601                 /* twiddle thumbs on netns device moves */
1602                 if (dev->reg_state != NETREG_UNREGISTERING)
1603                         break;
1604 
1605                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1606                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1607                 unregister_netdevice_many(&list_kill);
1608                 break;
1609         case NETDEV_PRE_TYPE_CHANGE:
1610                 /* Forbid underlaying device to change its type. */
1611                 return NOTIFY_BAD;
1612 
1613         case NETDEV_NOTIFY_PEERS:
1614         case NETDEV_BONDING_FAILOVER:
1615         case NETDEV_RESEND_IGMP:
1616                 /* Propagate to all vlans */
1617                 list_for_each_entry(vlan, &port->vlans, list)
1618                         call_netdevice_notifiers(event, vlan->dev);
1619         }
1620         return NOTIFY_DONE;
1621 }
1622 
1623 static struct notifier_block macvlan_notifier_block __read_mostly = {
1624         .notifier_call  = macvlan_device_event,
1625 };
1626 
1627 static int __init macvlan_init_module(void)
1628 {
1629         int err;
1630 
1631         register_netdevice_notifier(&macvlan_notifier_block);
1632 
1633         err = macvlan_link_register(&macvlan_link_ops);
1634         if (err < 0)
1635                 goto err1;
1636         return 0;
1637 err1:
1638         unregister_netdevice_notifier(&macvlan_notifier_block);
1639         return err;
1640 }
1641 
1642 static void __exit macvlan_cleanup_module(void)
1643 {
1644         rtnl_link_unregister(&macvlan_link_ops);
1645         unregister_netdevice_notifier(&macvlan_notifier_block);
1646 }
1647 
1648 module_init(macvlan_init_module);
1649 module_exit(macvlan_cleanup_module);
1650 
1651 MODULE_LICENSE("GPL");
1652 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1653 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1654 MODULE_ALIAS_RTNL_LINK("macvlan");
1655 

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