Version:  2.0.40 2.2.26 2.4.37 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9

Linux/drivers/net/macvlan.c

  1 /*
  2  * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
  3  *
  4  * This program is free software; you can redistribute it and/or
  5  * modify it under the terms of the GNU General Public License as
  6  * published by the Free Software Foundation; either version 2 of
  7  * the License, or (at your option) any later version.
  8  *
  9  * The code this is based on carried the following copyright notice:
 10  * ---
 11  * (C) Copyright 2001-2006
 12  * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
 13  * Re-worked by Ben Greear <greearb@candelatech.com>
 14  * ---
 15  */
 16 #include <linux/kernel.h>
 17 #include <linux/types.h>
 18 #include <linux/module.h>
 19 #include <linux/init.h>
 20 #include <linux/errno.h>
 21 #include <linux/slab.h>
 22 #include <linux/string.h>
 23 #include <linux/rculist.h>
 24 #include <linux/notifier.h>
 25 #include <linux/netdevice.h>
 26 #include <linux/etherdevice.h>
 27 #include <linux/ethtool.h>
 28 #include <linux/if_arp.h>
 29 #include <linux/if_vlan.h>
 30 #include <linux/if_link.h>
 31 #include <linux/if_macvlan.h>
 32 #include <linux/hash.h>
 33 #include <linux/workqueue.h>
 34 #include <net/rtnetlink.h>
 35 #include <net/xfrm.h>
 36 #include <linux/netpoll.h>
 37 
 38 #define MACVLAN_HASH_BITS       8
 39 #define MACVLAN_HASH_SIZE       (1<<MACVLAN_HASH_BITS)
 40 #define MACVLAN_BC_QUEUE_LEN    1000
 41 
 42 struct macvlan_port {
 43         struct net_device       *dev;
 44         struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
 45         struct list_head        vlans;
 46         struct rcu_head         rcu;
 47         struct sk_buff_head     bc_queue;
 48         struct work_struct      bc_work;
 49         bool                    passthru;
 50         int                     count;
 51         struct hlist_head       vlan_source_hash[MACVLAN_HASH_SIZE];
 52         DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
 53 };
 54 
 55 struct macvlan_source_entry {
 56         struct hlist_node       hlist;
 57         struct macvlan_dev      *vlan;
 58         unsigned char           addr[6+2] __aligned(sizeof(u16));
 59         struct rcu_head         rcu;
 60 };
 61 
 62 struct macvlan_skb_cb {
 63         const struct macvlan_dev *src;
 64 };
 65 
 66 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
 67 
 68 static void macvlan_port_destroy(struct net_device *dev);
 69 
 70 /* Hash Ethernet address */
 71 static u32 macvlan_eth_hash(const unsigned char *addr)
 72 {
 73         u64 value = get_unaligned((u64 *)addr);
 74 
 75         /* only want 6 bytes */
 76 #ifdef __BIG_ENDIAN
 77         value >>= 16;
 78 #else
 79         value <<= 16;
 80 #endif
 81         return hash_64(value, MACVLAN_HASH_BITS);
 82 }
 83 
 84 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
 85 {
 86         return rcu_dereference(dev->rx_handler_data);
 87 }
 88 
 89 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
 90 {
 91         return rtnl_dereference(dev->rx_handler_data);
 92 }
 93 
 94 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
 95 
 96 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
 97                                                const unsigned char *addr)
 98 {
 99         struct macvlan_dev *vlan;
100         u32 idx = macvlan_eth_hash(addr);
101 
102         hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) {
103                 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
104                         return vlan;
105         }
106         return NULL;
107 }
108 
109 static struct macvlan_source_entry *macvlan_hash_lookup_source(
110         const struct macvlan_dev *vlan,
111         const unsigned char *addr)
112 {
113         struct macvlan_source_entry *entry;
114         u32 idx = macvlan_eth_hash(addr);
115         struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
116 
117         hlist_for_each_entry_rcu(entry, h, hlist) {
118                 if (ether_addr_equal_64bits(entry->addr, addr) &&
119                     entry->vlan == vlan)
120                         return entry;
121         }
122         return NULL;
123 }
124 
125 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
126                                    const unsigned char *addr)
127 {
128         struct macvlan_port *port = vlan->port;
129         struct macvlan_source_entry *entry;
130         struct hlist_head *h;
131 
132         entry = macvlan_hash_lookup_source(vlan, addr);
133         if (entry)
134                 return 0;
135 
136         entry = kmalloc(sizeof(*entry), GFP_KERNEL);
137         if (!entry)
138                 return -ENOMEM;
139 
140         ether_addr_copy(entry->addr, addr);
141         entry->vlan = vlan;
142         h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
143         hlist_add_head_rcu(&entry->hlist, h);
144         vlan->macaddr_count++;
145 
146         return 0;
147 }
148 
149 static void macvlan_hash_add(struct macvlan_dev *vlan)
150 {
151         struct macvlan_port *port = vlan->port;
152         const unsigned char *addr = vlan->dev->dev_addr;
153         u32 idx = macvlan_eth_hash(addr);
154 
155         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
156 }
157 
158 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
159 {
160         hlist_del_rcu(&entry->hlist);
161         kfree_rcu(entry, rcu);
162 }
163 
164 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
165 {
166         hlist_del_rcu(&vlan->hlist);
167         if (sync)
168                 synchronize_rcu();
169 }
170 
171 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
172                                         const unsigned char *addr)
173 {
174         macvlan_hash_del(vlan, true);
175         /* Now that we are unhashed it is safe to change the device
176          * address without confusing packet delivery.
177          */
178         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
179         macvlan_hash_add(vlan);
180 }
181 
182 static int macvlan_addr_busy(const struct macvlan_port *port,
183                                 const unsigned char *addr)
184 {
185         /* Test to see if the specified multicast address is
186          * currently in use by the underlying device or
187          * another macvlan.
188          */
189         if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
190                 return 1;
191 
192         if (macvlan_hash_lookup(port, addr))
193                 return 1;
194 
195         return 0;
196 }
197 
198 
199 static int macvlan_broadcast_one(struct sk_buff *skb,
200                                  const struct macvlan_dev *vlan,
201                                  const struct ethhdr *eth, bool local)
202 {
203         struct net_device *dev = vlan->dev;
204 
205         if (local)
206                 return __dev_forward_skb(dev, skb);
207 
208         skb->dev = dev;
209         if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
210                 skb->pkt_type = PACKET_BROADCAST;
211         else
212                 skb->pkt_type = PACKET_MULTICAST;
213 
214         return 0;
215 }
216 
217 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
218 {
219         return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
220 }
221 
222 
223 static unsigned int mc_hash(const struct macvlan_dev *vlan,
224                             const unsigned char *addr)
225 {
226         u32 val = __get_unaligned_cpu32(addr + 2);
227 
228         val ^= macvlan_hash_mix(vlan);
229         return hash_32(val, MACVLAN_MC_FILTER_BITS);
230 }
231 
232 static void macvlan_broadcast(struct sk_buff *skb,
233                               const struct macvlan_port *port,
234                               struct net_device *src,
235                               enum macvlan_mode mode)
236 {
237         const struct ethhdr *eth = eth_hdr(skb);
238         const struct macvlan_dev *vlan;
239         struct sk_buff *nskb;
240         unsigned int i;
241         int err;
242         unsigned int hash;
243 
244         if (skb->protocol == htons(ETH_P_PAUSE))
245                 return;
246 
247         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
248                 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
249                         if (vlan->dev == src || !(vlan->mode & mode))
250                                 continue;
251 
252                         hash = mc_hash(vlan, eth->h_dest);
253                         if (!test_bit(hash, vlan->mc_filter))
254                                 continue;
255 
256                         err = NET_RX_DROP;
257                         nskb = skb_clone(skb, GFP_ATOMIC);
258                         if (likely(nskb))
259                                 err = macvlan_broadcast_one(
260                                         nskb, vlan, eth,
261                                         mode == MACVLAN_MODE_BRIDGE) ?:
262                                       netif_rx_ni(nskb);
263                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
264                                          err == NET_RX_SUCCESS, true);
265                 }
266         }
267 }
268 
269 static void macvlan_process_broadcast(struct work_struct *w)
270 {
271         struct macvlan_port *port = container_of(w, struct macvlan_port,
272                                                  bc_work);
273         struct sk_buff *skb;
274         struct sk_buff_head list;
275 
276         __skb_queue_head_init(&list);
277 
278         spin_lock_bh(&port->bc_queue.lock);
279         skb_queue_splice_tail_init(&port->bc_queue, &list);
280         spin_unlock_bh(&port->bc_queue.lock);
281 
282         while ((skb = __skb_dequeue(&list))) {
283                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
284 
285                 rcu_read_lock();
286 
287                 if (!src)
288                         /* frame comes from an external address */
289                         macvlan_broadcast(skb, port, NULL,
290                                           MACVLAN_MODE_PRIVATE |
291                                           MACVLAN_MODE_VEPA    |
292                                           MACVLAN_MODE_PASSTHRU|
293                                           MACVLAN_MODE_BRIDGE);
294                 else if (src->mode == MACVLAN_MODE_VEPA)
295                         /* flood to everyone except source */
296                         macvlan_broadcast(skb, port, src->dev,
297                                           MACVLAN_MODE_VEPA |
298                                           MACVLAN_MODE_BRIDGE);
299                 else
300                         /*
301                          * flood only to VEPA ports, bridge ports
302                          * already saw the frame on the way out.
303                          */
304                         macvlan_broadcast(skb, port, src->dev,
305                                           MACVLAN_MODE_VEPA);
306 
307                 rcu_read_unlock();
308 
309                 if (src)
310                         dev_put(src->dev);
311                 kfree_skb(skb);
312         }
313 }
314 
315 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
316                                       const struct macvlan_dev *src,
317                                       struct sk_buff *skb)
318 {
319         struct sk_buff *nskb;
320         int err = -ENOMEM;
321 
322         nskb = skb_clone(skb, GFP_ATOMIC);
323         if (!nskb)
324                 goto err;
325 
326         MACVLAN_SKB_CB(nskb)->src = src;
327 
328         spin_lock(&port->bc_queue.lock);
329         if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
330                 if (src)
331                         dev_hold(src->dev);
332                 __skb_queue_tail(&port->bc_queue, nskb);
333                 err = 0;
334         }
335         spin_unlock(&port->bc_queue.lock);
336 
337         if (err)
338                 goto free_nskb;
339 
340         schedule_work(&port->bc_work);
341         return;
342 
343 free_nskb:
344         kfree_skb(nskb);
345 err:
346         atomic_long_inc(&skb->dev->rx_dropped);
347 }
348 
349 static void macvlan_flush_sources(struct macvlan_port *port,
350                                   struct macvlan_dev *vlan)
351 {
352         int i;
353 
354         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
355                 struct hlist_node *h, *n;
356 
357                 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
358                         struct macvlan_source_entry *entry;
359 
360                         entry = hlist_entry(h, struct macvlan_source_entry,
361                                             hlist);
362                         if (entry->vlan == vlan)
363                                 macvlan_hash_del_source(entry);
364                 }
365         }
366         vlan->macaddr_count = 0;
367 }
368 
369 static void macvlan_forward_source_one(struct sk_buff *skb,
370                                        struct macvlan_dev *vlan)
371 {
372         struct sk_buff *nskb;
373         struct net_device *dev;
374         int len;
375         int ret;
376 
377         dev = vlan->dev;
378         if (unlikely(!(dev->flags & IFF_UP)))
379                 return;
380 
381         nskb = skb_clone(skb, GFP_ATOMIC);
382         if (!nskb)
383                 return;
384 
385         len = nskb->len + ETH_HLEN;
386         nskb->dev = dev;
387         nskb->pkt_type = PACKET_HOST;
388 
389         ret = netif_rx(nskb);
390         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
391 }
392 
393 static void macvlan_forward_source(struct sk_buff *skb,
394                                    struct macvlan_port *port,
395                                    const unsigned char *addr)
396 {
397         struct macvlan_source_entry *entry;
398         u32 idx = macvlan_eth_hash(addr);
399         struct hlist_head *h = &port->vlan_source_hash[idx];
400 
401         hlist_for_each_entry_rcu(entry, h, hlist) {
402                 if (ether_addr_equal_64bits(entry->addr, addr))
403                         if (entry->vlan->dev->flags & IFF_UP)
404                                 macvlan_forward_source_one(skb, entry->vlan);
405         }
406 }
407 
408 /* called under rcu_read_lock() from netif_receive_skb */
409 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
410 {
411         struct macvlan_port *port;
412         struct sk_buff *skb = *pskb;
413         const struct ethhdr *eth = eth_hdr(skb);
414         const struct macvlan_dev *vlan;
415         const struct macvlan_dev *src;
416         struct net_device *dev;
417         unsigned int len = 0;
418         int ret;
419         rx_handler_result_t handle_res;
420 
421         port = macvlan_port_get_rcu(skb->dev);
422         if (is_multicast_ether_addr(eth->h_dest)) {
423                 unsigned int hash;
424 
425                 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
426                 if (!skb)
427                         return RX_HANDLER_CONSUMED;
428                 *pskb = skb;
429                 eth = eth_hdr(skb);
430                 macvlan_forward_source(skb, port, eth->h_source);
431                 src = macvlan_hash_lookup(port, eth->h_source);
432                 if (src && src->mode != MACVLAN_MODE_VEPA &&
433                     src->mode != MACVLAN_MODE_BRIDGE) {
434                         /* forward to original port. */
435                         vlan = src;
436                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
437                               netif_rx(skb);
438                         handle_res = RX_HANDLER_CONSUMED;
439                         goto out;
440                 }
441 
442                 hash = mc_hash(NULL, eth->h_dest);
443                 if (test_bit(hash, port->mc_filter))
444                         macvlan_broadcast_enqueue(port, src, skb);
445 
446                 return RX_HANDLER_PASS;
447         }
448 
449         macvlan_forward_source(skb, port, eth->h_source);
450         if (port->passthru)
451                 vlan = list_first_or_null_rcu(&port->vlans,
452                                               struct macvlan_dev, list);
453         else
454                 vlan = macvlan_hash_lookup(port, eth->h_dest);
455         if (vlan == NULL)
456                 return RX_HANDLER_PASS;
457 
458         dev = vlan->dev;
459         if (unlikely(!(dev->flags & IFF_UP))) {
460                 kfree_skb(skb);
461                 return RX_HANDLER_CONSUMED;
462         }
463         len = skb->len + ETH_HLEN;
464         skb = skb_share_check(skb, GFP_ATOMIC);
465         if (!skb) {
466                 ret = NET_RX_DROP;
467                 handle_res = RX_HANDLER_CONSUMED;
468                 goto out;
469         }
470 
471         *pskb = skb;
472         skb->dev = dev;
473         skb->pkt_type = PACKET_HOST;
474 
475         ret = NET_RX_SUCCESS;
476         handle_res = RX_HANDLER_ANOTHER;
477 out:
478         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
479         return handle_res;
480 }
481 
482 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
483 {
484         const struct macvlan_dev *vlan = netdev_priv(dev);
485         const struct macvlan_port *port = vlan->port;
486         const struct macvlan_dev *dest;
487 
488         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
489                 const struct ethhdr *eth = (void *)skb->data;
490 
491                 /* send to other bridge ports directly */
492                 if (is_multicast_ether_addr(eth->h_dest)) {
493                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
494                         goto xmit_world;
495                 }
496 
497                 dest = macvlan_hash_lookup(port, eth->h_dest);
498                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
499                         /* send to lowerdev first for its network taps */
500                         dev_forward_skb(vlan->lowerdev, skb);
501 
502                         return NET_XMIT_SUCCESS;
503                 }
504         }
505 
506 xmit_world:
507         skb->dev = vlan->lowerdev;
508         return dev_queue_xmit(skb);
509 }
510 
511 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
512 {
513 #ifdef CONFIG_NET_POLL_CONTROLLER
514         if (vlan->netpoll)
515                 netpoll_send_skb(vlan->netpoll, skb);
516 #else
517         BUG();
518 #endif
519         return NETDEV_TX_OK;
520 }
521 
522 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
523                                       struct net_device *dev)
524 {
525         unsigned int len = skb->len;
526         int ret;
527         struct macvlan_dev *vlan = netdev_priv(dev);
528 
529         if (unlikely(netpoll_tx_running(dev)))
530                 return macvlan_netpoll_send_skb(vlan, skb);
531 
532         if (vlan->fwd_priv) {
533                 skb->dev = vlan->lowerdev;
534                 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
535         } else {
536                 ret = macvlan_queue_xmit(skb, dev);
537         }
538 
539         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
540                 struct vlan_pcpu_stats *pcpu_stats;
541 
542                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
543                 u64_stats_update_begin(&pcpu_stats->syncp);
544                 pcpu_stats->tx_packets++;
545                 pcpu_stats->tx_bytes += len;
546                 u64_stats_update_end(&pcpu_stats->syncp);
547         } else {
548                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
549         }
550         return ret;
551 }
552 
553 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
554                                unsigned short type, const void *daddr,
555                                const void *saddr, unsigned len)
556 {
557         const struct macvlan_dev *vlan = netdev_priv(dev);
558         struct net_device *lowerdev = vlan->lowerdev;
559 
560         return dev_hard_header(skb, lowerdev, type, daddr,
561                                saddr ? : dev->dev_addr, len);
562 }
563 
564 static const struct header_ops macvlan_hard_header_ops = {
565         .create         = macvlan_hard_header,
566         .parse          = eth_header_parse,
567         .cache          = eth_header_cache,
568         .cache_update   = eth_header_cache_update,
569 };
570 
571 static struct rtnl_link_ops macvlan_link_ops;
572 
573 static int macvlan_open(struct net_device *dev)
574 {
575         struct macvlan_dev *vlan = netdev_priv(dev);
576         struct net_device *lowerdev = vlan->lowerdev;
577         int err;
578 
579         if (vlan->port->passthru) {
580                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
581                         err = dev_set_promiscuity(lowerdev, 1);
582                         if (err < 0)
583                                 goto out;
584                 }
585                 goto hash_add;
586         }
587 
588         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
589             dev->rtnl_link_ops == &macvlan_link_ops) {
590                 vlan->fwd_priv =
591                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
592 
593                 /* If we get a NULL pointer back, or if we get an error
594                  * then we should just fall through to the non accelerated path
595                  */
596                 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
597                         vlan->fwd_priv = NULL;
598                 } else
599                         return 0;
600         }
601 
602         err = -EBUSY;
603         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
604                 goto out;
605 
606         err = dev_uc_add(lowerdev, dev->dev_addr);
607         if (err < 0)
608                 goto out;
609         if (dev->flags & IFF_ALLMULTI) {
610                 err = dev_set_allmulti(lowerdev, 1);
611                 if (err < 0)
612                         goto del_unicast;
613         }
614 
615         if (dev->flags & IFF_PROMISC) {
616                 err = dev_set_promiscuity(lowerdev, 1);
617                 if (err < 0)
618                         goto clear_multi;
619         }
620 
621 hash_add:
622         macvlan_hash_add(vlan);
623         return 0;
624 
625 clear_multi:
626         if (dev->flags & IFF_ALLMULTI)
627                 dev_set_allmulti(lowerdev, -1);
628 del_unicast:
629         dev_uc_del(lowerdev, dev->dev_addr);
630 out:
631         if (vlan->fwd_priv) {
632                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
633                                                            vlan->fwd_priv);
634                 vlan->fwd_priv = NULL;
635         }
636         return err;
637 }
638 
639 static int macvlan_stop(struct net_device *dev)
640 {
641         struct macvlan_dev *vlan = netdev_priv(dev);
642         struct net_device *lowerdev = vlan->lowerdev;
643 
644         if (vlan->fwd_priv) {
645                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
646                                                            vlan->fwd_priv);
647                 vlan->fwd_priv = NULL;
648                 return 0;
649         }
650 
651         dev_uc_unsync(lowerdev, dev);
652         dev_mc_unsync(lowerdev, dev);
653 
654         if (vlan->port->passthru) {
655                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
656                         dev_set_promiscuity(lowerdev, -1);
657                 goto hash_del;
658         }
659 
660         if (dev->flags & IFF_ALLMULTI)
661                 dev_set_allmulti(lowerdev, -1);
662 
663         if (dev->flags & IFF_PROMISC)
664                 dev_set_promiscuity(lowerdev, -1);
665 
666         dev_uc_del(lowerdev, dev->dev_addr);
667 
668 hash_del:
669         macvlan_hash_del(vlan, !dev->dismantle);
670         return 0;
671 }
672 
673 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
674 {
675         struct macvlan_dev *vlan = netdev_priv(dev);
676         struct net_device *lowerdev = vlan->lowerdev;
677         int err;
678 
679         if (!(dev->flags & IFF_UP)) {
680                 /* Just copy in the new address */
681                 ether_addr_copy(dev->dev_addr, addr);
682         } else {
683                 /* Rehash and update the device filters */
684                 if (macvlan_addr_busy(vlan->port, addr))
685                         return -EBUSY;
686 
687                 if (!vlan->port->passthru) {
688                         err = dev_uc_add(lowerdev, addr);
689                         if (err)
690                                 return err;
691 
692                         dev_uc_del(lowerdev, dev->dev_addr);
693                 }
694 
695                 macvlan_hash_change_addr(vlan, addr);
696         }
697         return 0;
698 }
699 
700 static int macvlan_set_mac_address(struct net_device *dev, void *p)
701 {
702         struct macvlan_dev *vlan = netdev_priv(dev);
703         struct sockaddr *addr = p;
704 
705         if (!is_valid_ether_addr(addr->sa_data))
706                 return -EADDRNOTAVAIL;
707 
708         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
709                 dev_set_mac_address(vlan->lowerdev, addr);
710                 return 0;
711         }
712 
713         return macvlan_sync_address(dev, addr->sa_data);
714 }
715 
716 static void macvlan_change_rx_flags(struct net_device *dev, int change)
717 {
718         struct macvlan_dev *vlan = netdev_priv(dev);
719         struct net_device *lowerdev = vlan->lowerdev;
720 
721         if (dev->flags & IFF_UP) {
722                 if (change & IFF_ALLMULTI)
723                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
724                 if (change & IFF_PROMISC)
725                         dev_set_promiscuity(lowerdev,
726                                             dev->flags & IFF_PROMISC ? 1 : -1);
727 
728         }
729 }
730 
731 static void macvlan_compute_filter(unsigned long *mc_filter,
732                                    struct net_device *dev,
733                                    struct macvlan_dev *vlan)
734 {
735         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
736                 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
737         } else {
738                 struct netdev_hw_addr *ha;
739                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
740 
741                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
742                 netdev_for_each_mc_addr(ha, dev) {
743                         __set_bit(mc_hash(vlan, ha->addr), filter);
744                 }
745 
746                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
747 
748                 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
749         }
750 }
751 
752 static void macvlan_set_mac_lists(struct net_device *dev)
753 {
754         struct macvlan_dev *vlan = netdev_priv(dev);
755 
756         macvlan_compute_filter(vlan->mc_filter, dev, vlan);
757 
758         dev_uc_sync(vlan->lowerdev, dev);
759         dev_mc_sync(vlan->lowerdev, dev);
760 
761         /* This is slightly inaccurate as we're including the subscription
762          * list of vlan->lowerdev too.
763          *
764          * Bug alert: This only works if everyone has the same broadcast
765          * address as lowerdev.  As soon as someone changes theirs this
766          * will break.
767          *
768          * However, this is already broken as when you change your broadcast
769          * address we don't get called.
770          *
771          * The solution is to maintain a list of broadcast addresses like
772          * we do for uc/mc, if you care.
773          */
774         macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
775 }
776 
777 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
778 {
779         struct macvlan_dev *vlan = netdev_priv(dev);
780 
781         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
782                 return -EINVAL;
783         dev->mtu = new_mtu;
784         return 0;
785 }
786 
787 /*
788  * macvlan network devices have devices nesting below it and are a special
789  * "super class" of normal network devices; split their locks off into a
790  * separate class since they always nest.
791  */
792 static struct lock_class_key macvlan_netdev_addr_lock_key;
793 
794 #define ALWAYS_ON_FEATURES \
795         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \
796          NETIF_F_GSO_ROBUST)
797 
798 #define MACVLAN_FEATURES \
799         (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
800          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \
801          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
802          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
803 
804 #define MACVLAN_STATE_MASK \
805         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
806 
807 static int macvlan_get_nest_level(struct net_device *dev)
808 {
809         return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
810 }
811 
812 static void macvlan_set_lockdep_class(struct net_device *dev)
813 {
814         netdev_lockdep_set_classes(dev);
815         lockdep_set_class_and_subclass(&dev->addr_list_lock,
816                                        &macvlan_netdev_addr_lock_key,
817                                        macvlan_get_nest_level(dev));
818 }
819 
820 static int macvlan_init(struct net_device *dev)
821 {
822         struct macvlan_dev *vlan = netdev_priv(dev);
823         const struct net_device *lowerdev = vlan->lowerdev;
824         struct macvlan_port *port = vlan->port;
825 
826         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
827                                   (lowerdev->state & MACVLAN_STATE_MASK);
828         dev->features           = lowerdev->features & MACVLAN_FEATURES;
829         dev->features           |= ALWAYS_ON_FEATURES;
830         dev->hw_features        |= NETIF_F_LRO;
831         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
832         dev->gso_max_size       = lowerdev->gso_max_size;
833         dev->gso_max_segs       = lowerdev->gso_max_segs;
834         dev->hard_header_len    = lowerdev->hard_header_len;
835 
836         macvlan_set_lockdep_class(dev);
837 
838         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
839         if (!vlan->pcpu_stats)
840                 return -ENOMEM;
841 
842         port->count += 1;
843 
844         return 0;
845 }
846 
847 static void macvlan_uninit(struct net_device *dev)
848 {
849         struct macvlan_dev *vlan = netdev_priv(dev);
850         struct macvlan_port *port = vlan->port;
851 
852         free_percpu(vlan->pcpu_stats);
853 
854         macvlan_flush_sources(port, vlan);
855         port->count -= 1;
856         if (!port->count)
857                 macvlan_port_destroy(port->dev);
858 }
859 
860 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
861                                                          struct rtnl_link_stats64 *stats)
862 {
863         struct macvlan_dev *vlan = netdev_priv(dev);
864 
865         if (vlan->pcpu_stats) {
866                 struct vlan_pcpu_stats *p;
867                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
868                 u32 rx_errors = 0, tx_dropped = 0;
869                 unsigned int start;
870                 int i;
871 
872                 for_each_possible_cpu(i) {
873                         p = per_cpu_ptr(vlan->pcpu_stats, i);
874                         do {
875                                 start = u64_stats_fetch_begin_irq(&p->syncp);
876                                 rx_packets      = p->rx_packets;
877                                 rx_bytes        = p->rx_bytes;
878                                 rx_multicast    = p->rx_multicast;
879                                 tx_packets      = p->tx_packets;
880                                 tx_bytes        = p->tx_bytes;
881                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
882 
883                         stats->rx_packets       += rx_packets;
884                         stats->rx_bytes         += rx_bytes;
885                         stats->multicast        += rx_multicast;
886                         stats->tx_packets       += tx_packets;
887                         stats->tx_bytes         += tx_bytes;
888                         /* rx_errors & tx_dropped are u32, updated
889                          * without syncp protection.
890                          */
891                         rx_errors       += p->rx_errors;
892                         tx_dropped      += p->tx_dropped;
893                 }
894                 stats->rx_errors        = rx_errors;
895                 stats->rx_dropped       = rx_errors;
896                 stats->tx_dropped       = tx_dropped;
897         }
898         return stats;
899 }
900 
901 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
902                                    __be16 proto, u16 vid)
903 {
904         struct macvlan_dev *vlan = netdev_priv(dev);
905         struct net_device *lowerdev = vlan->lowerdev;
906 
907         return vlan_vid_add(lowerdev, proto, vid);
908 }
909 
910 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
911                                     __be16 proto, u16 vid)
912 {
913         struct macvlan_dev *vlan = netdev_priv(dev);
914         struct net_device *lowerdev = vlan->lowerdev;
915 
916         vlan_vid_del(lowerdev, proto, vid);
917         return 0;
918 }
919 
920 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
921                            struct net_device *dev,
922                            const unsigned char *addr, u16 vid,
923                            u16 flags)
924 {
925         struct macvlan_dev *vlan = netdev_priv(dev);
926         int err = -EINVAL;
927 
928         /* Support unicast filter only on passthru devices.
929          * Multicast filter should be allowed on all devices.
930          */
931         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
932                 return -EOPNOTSUPP;
933 
934         if (flags & NLM_F_REPLACE)
935                 return -EOPNOTSUPP;
936 
937         if (is_unicast_ether_addr(addr))
938                 err = dev_uc_add_excl(dev, addr);
939         else if (is_multicast_ether_addr(addr))
940                 err = dev_mc_add_excl(dev, addr);
941 
942         return err;
943 }
944 
945 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
946                            struct net_device *dev,
947                            const unsigned char *addr, u16 vid)
948 {
949         struct macvlan_dev *vlan = netdev_priv(dev);
950         int err = -EINVAL;
951 
952         /* Support unicast filter only on passthru devices.
953          * Multicast filter should be allowed on all devices.
954          */
955         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
956                 return -EOPNOTSUPP;
957 
958         if (is_unicast_ether_addr(addr))
959                 err = dev_uc_del(dev, addr);
960         else if (is_multicast_ether_addr(addr))
961                 err = dev_mc_del(dev, addr);
962 
963         return err;
964 }
965 
966 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
967                                         struct ethtool_drvinfo *drvinfo)
968 {
969         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
970         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
971 }
972 
973 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
974                                               struct ethtool_link_ksettings *cmd)
975 {
976         const struct macvlan_dev *vlan = netdev_priv(dev);
977 
978         return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
979 }
980 
981 static netdev_features_t macvlan_fix_features(struct net_device *dev,
982                                               netdev_features_t features)
983 {
984         struct macvlan_dev *vlan = netdev_priv(dev);
985         netdev_features_t lowerdev_features = vlan->lowerdev->features;
986         netdev_features_t mask;
987 
988         features |= NETIF_F_ALL_FOR_ALL;
989         features &= (vlan->set_features | ~MACVLAN_FEATURES);
990         mask = features;
991 
992         lowerdev_features &= (features | ~NETIF_F_LRO);
993         features = netdev_increment_features(lowerdev_features, features, mask);
994         features |= ALWAYS_ON_FEATURES;
995         features &= ~NETIF_F_NETNS_LOCAL;
996 
997         return features;
998 }
999 
1000 #ifdef CONFIG_NET_POLL_CONTROLLER
1001 static void macvlan_dev_poll_controller(struct net_device *dev)
1002 {
1003         return;
1004 }
1005 
1006 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1007 {
1008         struct macvlan_dev *vlan = netdev_priv(dev);
1009         struct net_device *real_dev = vlan->lowerdev;
1010         struct netpoll *netpoll;
1011         int err = 0;
1012 
1013         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1014         err = -ENOMEM;
1015         if (!netpoll)
1016                 goto out;
1017 
1018         err = __netpoll_setup(netpoll, real_dev);
1019         if (err) {
1020                 kfree(netpoll);
1021                 goto out;
1022         }
1023 
1024         vlan->netpoll = netpoll;
1025 
1026 out:
1027         return err;
1028 }
1029 
1030 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1031 {
1032         struct macvlan_dev *vlan = netdev_priv(dev);
1033         struct netpoll *netpoll = vlan->netpoll;
1034 
1035         if (!netpoll)
1036                 return;
1037 
1038         vlan->netpoll = NULL;
1039 
1040         __netpoll_free_async(netpoll);
1041 }
1042 #endif  /* CONFIG_NET_POLL_CONTROLLER */
1043 
1044 static int macvlan_dev_get_iflink(const struct net_device *dev)
1045 {
1046         struct macvlan_dev *vlan = netdev_priv(dev);
1047 
1048         return vlan->lowerdev->ifindex;
1049 }
1050 
1051 static const struct ethtool_ops macvlan_ethtool_ops = {
1052         .get_link               = ethtool_op_get_link,
1053         .get_link_ksettings     = macvlan_ethtool_get_link_ksettings,
1054         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
1055 };
1056 
1057 static const struct net_device_ops macvlan_netdev_ops = {
1058         .ndo_init               = macvlan_init,
1059         .ndo_uninit             = macvlan_uninit,
1060         .ndo_open               = macvlan_open,
1061         .ndo_stop               = macvlan_stop,
1062         .ndo_start_xmit         = macvlan_start_xmit,
1063         .ndo_change_mtu         = macvlan_change_mtu,
1064         .ndo_fix_features       = macvlan_fix_features,
1065         .ndo_change_rx_flags    = macvlan_change_rx_flags,
1066         .ndo_set_mac_address    = macvlan_set_mac_address,
1067         .ndo_set_rx_mode        = macvlan_set_mac_lists,
1068         .ndo_get_stats64        = macvlan_dev_get_stats64,
1069         .ndo_validate_addr      = eth_validate_addr,
1070         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
1071         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
1072         .ndo_fdb_add            = macvlan_fdb_add,
1073         .ndo_fdb_del            = macvlan_fdb_del,
1074         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
1075         .ndo_get_lock_subclass  = macvlan_get_nest_level,
1076 #ifdef CONFIG_NET_POLL_CONTROLLER
1077         .ndo_poll_controller    = macvlan_dev_poll_controller,
1078         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
1079         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
1080 #endif
1081         .ndo_get_iflink         = macvlan_dev_get_iflink,
1082         .ndo_features_check     = passthru_features_check,
1083 };
1084 
1085 void macvlan_common_setup(struct net_device *dev)
1086 {
1087         ether_setup(dev);
1088 
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_rcu(port, rcu);
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         if (!tb[IFLA_ADDRESS])
1303                 eth_hw_addr_random(dev);
1304 
1305         if (!macvlan_port_exists(lowerdev)) {
1306                 err = macvlan_port_create(lowerdev);
1307                 if (err < 0)
1308                         return err;
1309                 create = true;
1310         }
1311         port = macvlan_port_get_rtnl(lowerdev);
1312 
1313         /* Only 1 macvlan device can be created in passthru mode */
1314         if (port->passthru) {
1315                 /* The macvlan port must be not created this time,
1316                  * still goto destroy_macvlan_port for readability.
1317                  */
1318                 err = -EINVAL;
1319                 goto destroy_macvlan_port;
1320         }
1321 
1322         vlan->lowerdev = lowerdev;
1323         vlan->dev      = dev;
1324         vlan->port     = port;
1325         vlan->set_features = MACVLAN_FEATURES;
1326         vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1327 
1328         vlan->mode     = MACVLAN_MODE_VEPA;
1329         if (data && data[IFLA_MACVLAN_MODE])
1330                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1331 
1332         if (data && data[IFLA_MACVLAN_FLAGS])
1333                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1334 
1335         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1336                 if (port->count) {
1337                         err = -EINVAL;
1338                         goto destroy_macvlan_port;
1339                 }
1340                 port->passthru = true;
1341                 eth_hw_addr_inherit(dev, lowerdev);
1342         }
1343 
1344         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1345                 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1346                         err = -EINVAL;
1347                         goto destroy_macvlan_port;
1348                 }
1349                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1350                 err = macvlan_changelink_sources(vlan, macmode, data);
1351                 if (err)
1352                         goto destroy_macvlan_port;
1353         }
1354 
1355         err = register_netdevice(dev);
1356         if (err < 0)
1357                 goto destroy_macvlan_port;
1358 
1359         dev->priv_flags |= IFF_MACVLAN;
1360         err = netdev_upper_dev_link(lowerdev, dev);
1361         if (err)
1362                 goto unregister_netdev;
1363 
1364         list_add_tail_rcu(&vlan->list, &port->vlans);
1365         netif_stacked_transfer_operstate(lowerdev, dev);
1366         linkwatch_fire_event(dev);
1367 
1368         return 0;
1369 
1370 unregister_netdev:
1371         unregister_netdevice(dev);
1372 destroy_macvlan_port:
1373         if (create)
1374                 macvlan_port_destroy(port->dev);
1375         return err;
1376 }
1377 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1378 
1379 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1380                            struct nlattr *tb[], struct nlattr *data[])
1381 {
1382         return macvlan_common_newlink(src_net, dev, tb, data);
1383 }
1384 
1385 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1386 {
1387         struct macvlan_dev *vlan = netdev_priv(dev);
1388 
1389         if (vlan->mode == MACVLAN_MODE_SOURCE)
1390                 macvlan_flush_sources(vlan->port, vlan);
1391         list_del_rcu(&vlan->list);
1392         unregister_netdevice_queue(dev, head);
1393         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1394 }
1395 EXPORT_SYMBOL_GPL(macvlan_dellink);
1396 
1397 static int macvlan_changelink(struct net_device *dev,
1398                 struct nlattr *tb[], struct nlattr *data[])
1399 {
1400         struct macvlan_dev *vlan = netdev_priv(dev);
1401         enum macvlan_mode mode;
1402         bool set_mode = false;
1403         enum macvlan_macaddr_mode macmode;
1404         int ret;
1405 
1406         /* Validate mode, but don't set yet: setting flags may fail. */
1407         if (data && data[IFLA_MACVLAN_MODE]) {
1408                 set_mode = true;
1409                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1410                 /* Passthrough mode can't be set or cleared dynamically */
1411                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1412                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1413                         return -EINVAL;
1414                 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1415                     vlan->mode != mode)
1416                         macvlan_flush_sources(vlan->port, vlan);
1417         }
1418 
1419         if (data && data[IFLA_MACVLAN_FLAGS]) {
1420                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1421                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1422                 if (vlan->port->passthru && promisc) {
1423                         int err;
1424 
1425                         if (flags & MACVLAN_FLAG_NOPROMISC)
1426                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1427                         else
1428                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1429                         if (err < 0)
1430                                 return err;
1431                 }
1432                 vlan->flags = flags;
1433         }
1434         if (set_mode)
1435                 vlan->mode = mode;
1436         if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1437                 if (vlan->mode != MACVLAN_MODE_SOURCE)
1438                         return -EINVAL;
1439                 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1440                 ret = macvlan_changelink_sources(vlan, macmode, data);
1441                 if (ret)
1442                         return ret;
1443         }
1444         return 0;
1445 }
1446 
1447 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1448 {
1449         if (vlan->macaddr_count == 0)
1450                 return 0;
1451         return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1452                 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1453 }
1454 
1455 static size_t macvlan_get_size(const struct net_device *dev)
1456 {
1457         struct macvlan_dev *vlan = netdev_priv(dev);
1458 
1459         return (0
1460                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1461                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1462                 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1463                 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1464                 );
1465 }
1466 
1467 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1468                                      const struct macvlan_dev *vlan,
1469                                      const int i)
1470 {
1471         struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1472         struct macvlan_source_entry *entry;
1473 
1474         hlist_for_each_entry_rcu(entry, h, hlist) {
1475                 if (entry->vlan != vlan)
1476                         continue;
1477                 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1478                         return 1;
1479         }
1480         return 0;
1481 }
1482 
1483 static int macvlan_fill_info(struct sk_buff *skb,
1484                                 const struct net_device *dev)
1485 {
1486         struct macvlan_dev *vlan = netdev_priv(dev);
1487         int i;
1488         struct nlattr *nest;
1489 
1490         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1491                 goto nla_put_failure;
1492         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1493                 goto nla_put_failure;
1494         if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1495                 goto nla_put_failure;
1496         if (vlan->macaddr_count > 0) {
1497                 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1498                 if (nest == NULL)
1499                         goto nla_put_failure;
1500 
1501                 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1502                         if (macvlan_fill_info_macaddr(skb, vlan, i))
1503                                 goto nla_put_failure;
1504                 }
1505                 nla_nest_end(skb, nest);
1506         }
1507         return 0;
1508 
1509 nla_put_failure:
1510         return -EMSGSIZE;
1511 }
1512 
1513 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1514         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1515         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1516         [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1517         [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1518         [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1519         [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1520 };
1521 
1522 int macvlan_link_register(struct rtnl_link_ops *ops)
1523 {
1524         /* common fields */
1525         ops->priv_size          = sizeof(struct macvlan_dev);
1526         ops->validate           = macvlan_validate;
1527         ops->maxtype            = IFLA_MACVLAN_MAX;
1528         ops->policy             = macvlan_policy;
1529         ops->changelink         = macvlan_changelink;
1530         ops->get_size           = macvlan_get_size;
1531         ops->fill_info          = macvlan_fill_info;
1532 
1533         return rtnl_link_register(ops);
1534 };
1535 EXPORT_SYMBOL_GPL(macvlan_link_register);
1536 
1537 static struct net *macvlan_get_link_net(const struct net_device *dev)
1538 {
1539         return dev_net(macvlan_dev_real_dev(dev));
1540 }
1541 
1542 static struct rtnl_link_ops macvlan_link_ops = {
1543         .kind           = "macvlan",
1544         .setup          = macvlan_setup,
1545         .newlink        = macvlan_newlink,
1546         .dellink        = macvlan_dellink,
1547         .get_link_net   = macvlan_get_link_net,
1548 };
1549 
1550 static int macvlan_device_event(struct notifier_block *unused,
1551                                 unsigned long event, void *ptr)
1552 {
1553         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1554         struct macvlan_dev *vlan, *next;
1555         struct macvlan_port *port;
1556         LIST_HEAD(list_kill);
1557 
1558         if (!macvlan_port_exists(dev))
1559                 return NOTIFY_DONE;
1560 
1561         port = macvlan_port_get_rtnl(dev);
1562 
1563         switch (event) {
1564         case NETDEV_UP:
1565         case NETDEV_CHANGE:
1566                 list_for_each_entry(vlan, &port->vlans, list)
1567                         netif_stacked_transfer_operstate(vlan->lowerdev,
1568                                                          vlan->dev);
1569                 break;
1570         case NETDEV_FEAT_CHANGE:
1571                 list_for_each_entry(vlan, &port->vlans, list) {
1572                         vlan->dev->gso_max_size = dev->gso_max_size;
1573                         vlan->dev->gso_max_segs = dev->gso_max_segs;
1574                         netdev_update_features(vlan->dev);
1575                 }
1576                 break;
1577         case NETDEV_CHANGEMTU:
1578                 list_for_each_entry(vlan, &port->vlans, list) {
1579                         if (vlan->dev->mtu <= dev->mtu)
1580                                 continue;
1581                         dev_set_mtu(vlan->dev, dev->mtu);
1582                 }
1583                 break;
1584         case NETDEV_CHANGEADDR:
1585                 if (!port->passthru)
1586                         return NOTIFY_DONE;
1587 
1588                 vlan = list_first_entry_or_null(&port->vlans,
1589                                                 struct macvlan_dev,
1590                                                 list);
1591 
1592                 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1593                         return NOTIFY_BAD;
1594 
1595                 break;
1596         case NETDEV_UNREGISTER:
1597                 /* twiddle thumbs on netns device moves */
1598                 if (dev->reg_state != NETREG_UNREGISTERING)
1599                         break;
1600 
1601                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1602                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1603                 unregister_netdevice_many(&list_kill);
1604                 break;
1605         case NETDEV_PRE_TYPE_CHANGE:
1606                 /* Forbid underlaying device to change its type. */
1607                 return NOTIFY_BAD;
1608 
1609         case NETDEV_NOTIFY_PEERS:
1610         case NETDEV_BONDING_FAILOVER:
1611         case NETDEV_RESEND_IGMP:
1612                 /* Propagate to all vlans */
1613                 list_for_each_entry(vlan, &port->vlans, list)
1614                         call_netdevice_notifiers(event, vlan->dev);
1615         }
1616         return NOTIFY_DONE;
1617 }
1618 
1619 static struct notifier_block macvlan_notifier_block __read_mostly = {
1620         .notifier_call  = macvlan_device_event,
1621 };
1622 
1623 static int __init macvlan_init_module(void)
1624 {
1625         int err;
1626 
1627         register_netdevice_notifier(&macvlan_notifier_block);
1628 
1629         err = macvlan_link_register(&macvlan_link_ops);
1630         if (err < 0)
1631                 goto err1;
1632         return 0;
1633 err1:
1634         unregister_netdevice_notifier(&macvlan_notifier_block);
1635         return err;
1636 }
1637 
1638 static void __exit macvlan_cleanup_module(void)
1639 {
1640         rtnl_link_unregister(&macvlan_link_ops);
1641         unregister_netdevice_notifier(&macvlan_notifier_block);
1642 }
1643 
1644 module_init(macvlan_init_module);
1645 module_exit(macvlan_cleanup_module);
1646 
1647 MODULE_LICENSE("GPL");
1648 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1649 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1650 MODULE_ALIAS_RTNL_LINK("macvlan");
1651 

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