Version:  2.6.34 2.6.35 2.6.36 2.6.37 2.6.38 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14

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 <net/rtnetlink.h>
 34 #include <net/xfrm.h>
 35 
 36 #define MACVLAN_HASH_SIZE       (1 << BITS_PER_BYTE)
 37 
 38 struct macvlan_port {
 39         struct net_device       *dev;
 40         struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
 41         struct list_head        vlans;
 42         struct rcu_head         rcu;
 43         bool                    passthru;
 44         int                     count;
 45 };
 46 
 47 static void macvlan_port_destroy(struct net_device *dev);
 48 
 49 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
 50 {
 51         return rcu_dereference(dev->rx_handler_data);
 52 }
 53 
 54 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
 55 {
 56         return rtnl_dereference(dev->rx_handler_data);
 57 }
 58 
 59 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
 60 
 61 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
 62                                                const unsigned char *addr)
 63 {
 64         struct macvlan_dev *vlan;
 65 
 66         hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) {
 67                 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
 68                         return vlan;
 69         }
 70         return NULL;
 71 }
 72 
 73 static void macvlan_hash_add(struct macvlan_dev *vlan)
 74 {
 75         struct macvlan_port *port = vlan->port;
 76         const unsigned char *addr = vlan->dev->dev_addr;
 77 
 78         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
 79 }
 80 
 81 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
 82 {
 83         hlist_del_rcu(&vlan->hlist);
 84         if (sync)
 85                 synchronize_rcu();
 86 }
 87 
 88 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
 89                                         const unsigned char *addr)
 90 {
 91         macvlan_hash_del(vlan, true);
 92         /* Now that we are unhashed it is safe to change the device
 93          * address without confusing packet delivery.
 94          */
 95         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
 96         macvlan_hash_add(vlan);
 97 }
 98 
 99 static int macvlan_addr_busy(const struct macvlan_port *port,
100                                 const unsigned char *addr)
101 {
102         /* Test to see if the specified multicast address is
103          * currently in use by the underlying device or
104          * another macvlan.
105          */
106         if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
107                 return 1;
108 
109         if (macvlan_hash_lookup(port, addr))
110                 return 1;
111 
112         return 0;
113 }
114 
115 
116 static int macvlan_broadcast_one(struct sk_buff *skb,
117                                  const struct macvlan_dev *vlan,
118                                  const struct ethhdr *eth, bool local)
119 {
120         struct net_device *dev = vlan->dev;
121 
122         if (local)
123                 return dev_forward_skb(dev, skb);
124 
125         skb->dev = dev;
126         if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
127                 skb->pkt_type = PACKET_BROADCAST;
128         else
129                 skb->pkt_type = PACKET_MULTICAST;
130 
131         return netif_rx(skb);
132 }
133 
134 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
135 {
136         return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
137 }
138 
139 
140 static unsigned int mc_hash(const struct macvlan_dev *vlan,
141                             const unsigned char *addr)
142 {
143         u32 val = __get_unaligned_cpu32(addr + 2);
144 
145         val ^= macvlan_hash_mix(vlan);
146         return hash_32(val, MACVLAN_MC_FILTER_BITS);
147 }
148 
149 static void macvlan_broadcast(struct sk_buff *skb,
150                               const struct macvlan_port *port,
151                               struct net_device *src,
152                               enum macvlan_mode mode)
153 {
154         const struct ethhdr *eth = eth_hdr(skb);
155         const struct macvlan_dev *vlan;
156         struct sk_buff *nskb;
157         unsigned int i;
158         int err;
159         unsigned int hash;
160 
161         if (skb->protocol == htons(ETH_P_PAUSE))
162                 return;
163 
164         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
165                 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
166                         if (vlan->dev == src || !(vlan->mode & mode))
167                                 continue;
168 
169                         hash = mc_hash(vlan, eth->h_dest);
170                         if (!test_bit(hash, vlan->mc_filter))
171                                 continue;
172 
173                         err = NET_RX_DROP;
174                         nskb = skb_clone(skb, GFP_ATOMIC);
175                         if (likely(nskb))
176                                 err = macvlan_broadcast_one(
177                                         nskb, vlan, eth,
178                                         mode == MACVLAN_MODE_BRIDGE);
179                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
180                                          err == NET_RX_SUCCESS, 1);
181                 }
182         }
183 }
184 
185 /* called under rcu_read_lock() from netif_receive_skb */
186 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
187 {
188         struct macvlan_port *port;
189         struct sk_buff *skb = *pskb;
190         const struct ethhdr *eth = eth_hdr(skb);
191         const struct macvlan_dev *vlan;
192         const struct macvlan_dev *src;
193         struct net_device *dev;
194         unsigned int len = 0;
195         int ret = NET_RX_DROP;
196 
197         port = macvlan_port_get_rcu(skb->dev);
198         if (is_multicast_ether_addr(eth->h_dest)) {
199                 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
200                 if (!skb)
201                         return RX_HANDLER_CONSUMED;
202                 eth = eth_hdr(skb);
203                 src = macvlan_hash_lookup(port, eth->h_source);
204                 if (!src)
205                         /* frame comes from an external address */
206                         macvlan_broadcast(skb, port, NULL,
207                                           MACVLAN_MODE_PRIVATE |
208                                           MACVLAN_MODE_VEPA    |
209                                           MACVLAN_MODE_PASSTHRU|
210                                           MACVLAN_MODE_BRIDGE);
211                 else if (src->mode == MACVLAN_MODE_VEPA)
212                         /* flood to everyone except source */
213                         macvlan_broadcast(skb, port, src->dev,
214                                           MACVLAN_MODE_VEPA |
215                                           MACVLAN_MODE_BRIDGE);
216                 else if (src->mode == MACVLAN_MODE_BRIDGE)
217                         /*
218                          * flood only to VEPA ports, bridge ports
219                          * already saw the frame on the way out.
220                          */
221                         macvlan_broadcast(skb, port, src->dev,
222                                           MACVLAN_MODE_VEPA);
223                 else {
224                         /* forward to original port. */
225                         vlan = src;
226                         ret = macvlan_broadcast_one(skb, vlan, eth, 0);
227                         goto out;
228                 }
229 
230                 return RX_HANDLER_PASS;
231         }
232 
233         if (port->passthru)
234                 vlan = list_first_or_null_rcu(&port->vlans,
235                                               struct macvlan_dev, list);
236         else
237                 vlan = macvlan_hash_lookup(port, eth->h_dest);
238         if (vlan == NULL)
239                 return RX_HANDLER_PASS;
240 
241         dev = vlan->dev;
242         if (unlikely(!(dev->flags & IFF_UP))) {
243                 kfree_skb(skb);
244                 return RX_HANDLER_CONSUMED;
245         }
246         len = skb->len + ETH_HLEN;
247         skb = skb_share_check(skb, GFP_ATOMIC);
248         if (!skb)
249                 goto out;
250 
251         skb->dev = dev;
252         skb->pkt_type = PACKET_HOST;
253 
254         ret = netif_rx(skb);
255 
256 out:
257         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
258         return RX_HANDLER_CONSUMED;
259 }
260 
261 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
262 {
263         const struct macvlan_dev *vlan = netdev_priv(dev);
264         const struct macvlan_port *port = vlan->port;
265         const struct macvlan_dev *dest;
266         __u8 ip_summed = skb->ip_summed;
267 
268         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
269                 const struct ethhdr *eth = (void *)skb->data;
270                 skb->ip_summed = CHECKSUM_UNNECESSARY;
271 
272                 /* send to other bridge ports directly */
273                 if (is_multicast_ether_addr(eth->h_dest)) {
274                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
275                         goto xmit_world;
276                 }
277 
278                 dest = macvlan_hash_lookup(port, eth->h_dest);
279                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
280                         /* send to lowerdev first for its network taps */
281                         dev_forward_skb(vlan->lowerdev, skb);
282 
283                         return NET_XMIT_SUCCESS;
284                 }
285         }
286 
287 xmit_world:
288         skb->ip_summed = ip_summed;
289         skb->dev = vlan->lowerdev;
290         return dev_queue_xmit(skb);
291 }
292 
293 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
294                                       struct net_device *dev)
295 {
296         unsigned int len = skb->len;
297         int ret;
298         const struct macvlan_dev *vlan = netdev_priv(dev);
299 
300         if (vlan->fwd_priv) {
301                 skb->dev = vlan->lowerdev;
302                 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
303         } else {
304                 ret = macvlan_queue_xmit(skb, dev);
305         }
306 
307         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
308                 struct vlan_pcpu_stats *pcpu_stats;
309 
310                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
311                 u64_stats_update_begin(&pcpu_stats->syncp);
312                 pcpu_stats->tx_packets++;
313                 pcpu_stats->tx_bytes += len;
314                 u64_stats_update_end(&pcpu_stats->syncp);
315         } else {
316                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
317         }
318         return ret;
319 }
320 
321 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
322                                unsigned short type, const void *daddr,
323                                const void *saddr, unsigned len)
324 {
325         const struct macvlan_dev *vlan = netdev_priv(dev);
326         struct net_device *lowerdev = vlan->lowerdev;
327 
328         return dev_hard_header(skb, lowerdev, type, daddr,
329                                saddr ? : dev->dev_addr, len);
330 }
331 
332 static const struct header_ops macvlan_hard_header_ops = {
333         .create         = macvlan_hard_header,
334         .rebuild        = eth_rebuild_header,
335         .parse          = eth_header_parse,
336         .cache          = eth_header_cache,
337         .cache_update   = eth_header_cache_update,
338 };
339 
340 static struct rtnl_link_ops macvlan_link_ops;
341 
342 static int macvlan_open(struct net_device *dev)
343 {
344         struct macvlan_dev *vlan = netdev_priv(dev);
345         struct net_device *lowerdev = vlan->lowerdev;
346         int err;
347 
348         if (vlan->port->passthru) {
349                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
350                         err = dev_set_promiscuity(lowerdev, 1);
351                         if (err < 0)
352                                 goto out;
353                 }
354                 goto hash_add;
355         }
356 
357         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
358             dev->rtnl_link_ops == &macvlan_link_ops) {
359                 vlan->fwd_priv =
360                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
361 
362                 /* If we get a NULL pointer back, or if we get an error
363                  * then we should just fall through to the non accelerated path
364                  */
365                 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
366                         vlan->fwd_priv = NULL;
367                 } else
368                         return 0;
369         }
370 
371         err = -EBUSY;
372         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
373                 goto out;
374 
375         err = dev_uc_add(lowerdev, dev->dev_addr);
376         if (err < 0)
377                 goto out;
378         if (dev->flags & IFF_ALLMULTI) {
379                 err = dev_set_allmulti(lowerdev, 1);
380                 if (err < 0)
381                         goto del_unicast;
382         }
383 
384 hash_add:
385         macvlan_hash_add(vlan);
386         return 0;
387 
388 del_unicast:
389         dev_uc_del(lowerdev, dev->dev_addr);
390 out:
391         if (vlan->fwd_priv) {
392                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
393                                                            vlan->fwd_priv);
394                 vlan->fwd_priv = NULL;
395         }
396         return err;
397 }
398 
399 static int macvlan_stop(struct net_device *dev)
400 {
401         struct macvlan_dev *vlan = netdev_priv(dev);
402         struct net_device *lowerdev = vlan->lowerdev;
403 
404         if (vlan->fwd_priv) {
405                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
406                                                            vlan->fwd_priv);
407                 vlan->fwd_priv = NULL;
408                 return 0;
409         }
410 
411         dev_uc_unsync(lowerdev, dev);
412         dev_mc_unsync(lowerdev, dev);
413 
414         if (vlan->port->passthru) {
415                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
416                         dev_set_promiscuity(lowerdev, -1);
417                 goto hash_del;
418         }
419 
420         if (dev->flags & IFF_ALLMULTI)
421                 dev_set_allmulti(lowerdev, -1);
422 
423         dev_uc_del(lowerdev, dev->dev_addr);
424 
425 hash_del:
426         macvlan_hash_del(vlan, !dev->dismantle);
427         return 0;
428 }
429 
430 static int macvlan_set_mac_address(struct net_device *dev, void *p)
431 {
432         struct macvlan_dev *vlan = netdev_priv(dev);
433         struct net_device *lowerdev = vlan->lowerdev;
434         struct sockaddr *addr = p;
435         int err;
436 
437         if (!is_valid_ether_addr(addr->sa_data))
438                 return -EADDRNOTAVAIL;
439 
440         if (!(dev->flags & IFF_UP)) {
441                 /* Just copy in the new address */
442                 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
443         } else {
444                 /* Rehash and update the device filters */
445                 if (macvlan_addr_busy(vlan->port, addr->sa_data))
446                         return -EBUSY;
447 
448                 err = dev_uc_add(lowerdev, addr->sa_data);
449                 if (err)
450                         return err;
451 
452                 dev_uc_del(lowerdev, dev->dev_addr);
453 
454                 macvlan_hash_change_addr(vlan, addr->sa_data);
455         }
456         return 0;
457 }
458 
459 static void macvlan_change_rx_flags(struct net_device *dev, int change)
460 {
461         struct macvlan_dev *vlan = netdev_priv(dev);
462         struct net_device *lowerdev = vlan->lowerdev;
463 
464         if (change & IFF_ALLMULTI)
465                 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
466 }
467 
468 static void macvlan_set_mac_lists(struct net_device *dev)
469 {
470         struct macvlan_dev *vlan = netdev_priv(dev);
471 
472         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
473                 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
474         } else {
475                 struct netdev_hw_addr *ha;
476                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
477 
478                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
479                 netdev_for_each_mc_addr(ha, dev) {
480                         __set_bit(mc_hash(vlan, ha->addr), filter);
481                 }
482 
483                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
484 
485                 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
486         }
487         dev_uc_sync(vlan->lowerdev, dev);
488         dev_mc_sync(vlan->lowerdev, dev);
489 }
490 
491 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
492 {
493         struct macvlan_dev *vlan = netdev_priv(dev);
494 
495         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
496                 return -EINVAL;
497         dev->mtu = new_mtu;
498         return 0;
499 }
500 
501 /*
502  * macvlan network devices have devices nesting below it and are a special
503  * "super class" of normal network devices; split their locks off into a
504  * separate class since they always nest.
505  */
506 static struct lock_class_key macvlan_netdev_xmit_lock_key;
507 static struct lock_class_key macvlan_netdev_addr_lock_key;
508 
509 #define ALWAYS_ON_FEATURES \
510         (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX)
511 
512 #define MACVLAN_FEATURES \
513         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
514          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
515          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
516          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
517 
518 #define MACVLAN_STATE_MASK \
519         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
520 
521 static void macvlan_set_lockdep_class_one(struct net_device *dev,
522                                           struct netdev_queue *txq,
523                                           void *_unused)
524 {
525         lockdep_set_class(&txq->_xmit_lock,
526                           &macvlan_netdev_xmit_lock_key);
527 }
528 
529 static void macvlan_set_lockdep_class(struct net_device *dev)
530 {
531         lockdep_set_class(&dev->addr_list_lock,
532                           &macvlan_netdev_addr_lock_key);
533         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
534 }
535 
536 static int macvlan_init(struct net_device *dev)
537 {
538         struct macvlan_dev *vlan = netdev_priv(dev);
539         const struct net_device *lowerdev = vlan->lowerdev;
540         int i;
541 
542         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
543                                   (lowerdev->state & MACVLAN_STATE_MASK);
544         dev->features           = lowerdev->features & MACVLAN_FEATURES;
545         dev->features           |= ALWAYS_ON_FEATURES;
546         dev->gso_max_size       = lowerdev->gso_max_size;
547         dev->iflink             = lowerdev->ifindex;
548         dev->hard_header_len    = lowerdev->hard_header_len;
549 
550         macvlan_set_lockdep_class(dev);
551 
552         vlan->pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
553         if (!vlan->pcpu_stats)
554                 return -ENOMEM;
555 
556         for_each_possible_cpu(i) {
557                 struct vlan_pcpu_stats *mvlstats;
558                 mvlstats = per_cpu_ptr(vlan->pcpu_stats, i);
559                 u64_stats_init(&mvlstats->syncp);
560         }
561 
562         return 0;
563 }
564 
565 static void macvlan_uninit(struct net_device *dev)
566 {
567         struct macvlan_dev *vlan = netdev_priv(dev);
568         struct macvlan_port *port = vlan->port;
569 
570         free_percpu(vlan->pcpu_stats);
571 
572         port->count -= 1;
573         if (!port->count)
574                 macvlan_port_destroy(port->dev);
575 }
576 
577 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
578                                                          struct rtnl_link_stats64 *stats)
579 {
580         struct macvlan_dev *vlan = netdev_priv(dev);
581 
582         if (vlan->pcpu_stats) {
583                 struct vlan_pcpu_stats *p;
584                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
585                 u32 rx_errors = 0, tx_dropped = 0;
586                 unsigned int start;
587                 int i;
588 
589                 for_each_possible_cpu(i) {
590                         p = per_cpu_ptr(vlan->pcpu_stats, i);
591                         do {
592                                 start = u64_stats_fetch_begin_bh(&p->syncp);
593                                 rx_packets      = p->rx_packets;
594                                 rx_bytes        = p->rx_bytes;
595                                 rx_multicast    = p->rx_multicast;
596                                 tx_packets      = p->tx_packets;
597                                 tx_bytes        = p->tx_bytes;
598                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
599 
600                         stats->rx_packets       += rx_packets;
601                         stats->rx_bytes         += rx_bytes;
602                         stats->multicast        += rx_multicast;
603                         stats->tx_packets       += tx_packets;
604                         stats->tx_bytes         += tx_bytes;
605                         /* rx_errors & tx_dropped are u32, updated
606                          * without syncp protection.
607                          */
608                         rx_errors       += p->rx_errors;
609                         tx_dropped      += p->tx_dropped;
610                 }
611                 stats->rx_errors        = rx_errors;
612                 stats->rx_dropped       = rx_errors;
613                 stats->tx_dropped       = tx_dropped;
614         }
615         return stats;
616 }
617 
618 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
619                                    __be16 proto, u16 vid)
620 {
621         struct macvlan_dev *vlan = netdev_priv(dev);
622         struct net_device *lowerdev = vlan->lowerdev;
623 
624         return vlan_vid_add(lowerdev, proto, vid);
625 }
626 
627 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
628                                     __be16 proto, u16 vid)
629 {
630         struct macvlan_dev *vlan = netdev_priv(dev);
631         struct net_device *lowerdev = vlan->lowerdev;
632 
633         vlan_vid_del(lowerdev, proto, vid);
634         return 0;
635 }
636 
637 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
638                            struct net_device *dev,
639                            const unsigned char *addr,
640                            u16 flags)
641 {
642         struct macvlan_dev *vlan = netdev_priv(dev);
643         int err = -EINVAL;
644 
645         if (!vlan->port->passthru)
646                 return -EOPNOTSUPP;
647 
648         if (flags & NLM_F_REPLACE)
649                 return -EOPNOTSUPP;
650 
651         if (is_unicast_ether_addr(addr))
652                 err = dev_uc_add_excl(dev, addr);
653         else if (is_multicast_ether_addr(addr))
654                 err = dev_mc_add_excl(dev, addr);
655 
656         return err;
657 }
658 
659 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
660                            struct net_device *dev,
661                            const unsigned char *addr)
662 {
663         struct macvlan_dev *vlan = netdev_priv(dev);
664         int err = -EINVAL;
665 
666         if (!vlan->port->passthru)
667                 return -EOPNOTSUPP;
668 
669         if (is_unicast_ether_addr(addr))
670                 err = dev_uc_del(dev, addr);
671         else if (is_multicast_ether_addr(addr))
672                 err = dev_mc_del(dev, addr);
673 
674         return err;
675 }
676 
677 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
678                                         struct ethtool_drvinfo *drvinfo)
679 {
680         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
681         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
682 }
683 
684 static int macvlan_ethtool_get_settings(struct net_device *dev,
685                                         struct ethtool_cmd *cmd)
686 {
687         const struct macvlan_dev *vlan = netdev_priv(dev);
688 
689         return __ethtool_get_settings(vlan->lowerdev, cmd);
690 }
691 
692 static netdev_features_t macvlan_fix_features(struct net_device *dev,
693                                               netdev_features_t features)
694 {
695         struct macvlan_dev *vlan = netdev_priv(dev);
696         netdev_features_t mask;
697 
698         features |= NETIF_F_ALL_FOR_ALL;
699         features &= (vlan->set_features | ~MACVLAN_FEATURES);
700         mask = features;
701 
702         features = netdev_increment_features(vlan->lowerdev->features,
703                                              features,
704                                              mask);
705         features |= ALWAYS_ON_FEATURES;
706 
707         return features;
708 }
709 
710 static const struct ethtool_ops macvlan_ethtool_ops = {
711         .get_link               = ethtool_op_get_link,
712         .get_settings           = macvlan_ethtool_get_settings,
713         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
714 };
715 
716 static const struct net_device_ops macvlan_netdev_ops = {
717         .ndo_init               = macvlan_init,
718         .ndo_uninit             = macvlan_uninit,
719         .ndo_open               = macvlan_open,
720         .ndo_stop               = macvlan_stop,
721         .ndo_start_xmit         = macvlan_start_xmit,
722         .ndo_change_mtu         = macvlan_change_mtu,
723         .ndo_fix_features       = macvlan_fix_features,
724         .ndo_change_rx_flags    = macvlan_change_rx_flags,
725         .ndo_set_mac_address    = macvlan_set_mac_address,
726         .ndo_set_rx_mode        = macvlan_set_mac_lists,
727         .ndo_get_stats64        = macvlan_dev_get_stats64,
728         .ndo_validate_addr      = eth_validate_addr,
729         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
730         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
731         .ndo_fdb_add            = macvlan_fdb_add,
732         .ndo_fdb_del            = macvlan_fdb_del,
733         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
734 };
735 
736 void macvlan_common_setup(struct net_device *dev)
737 {
738         ether_setup(dev);
739 
740         dev->priv_flags        &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
741         dev->priv_flags        |= IFF_UNICAST_FLT;
742         dev->netdev_ops         = &macvlan_netdev_ops;
743         dev->destructor         = free_netdev;
744         dev->header_ops         = &macvlan_hard_header_ops;
745         dev->ethtool_ops        = &macvlan_ethtool_ops;
746 }
747 EXPORT_SYMBOL_GPL(macvlan_common_setup);
748 
749 static void macvlan_setup(struct net_device *dev)
750 {
751         macvlan_common_setup(dev);
752         dev->tx_queue_len       = 0;
753 }
754 
755 static int macvlan_port_create(struct net_device *dev)
756 {
757         struct macvlan_port *port;
758         unsigned int i;
759         int err;
760 
761         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
762                 return -EINVAL;
763 
764         port = kzalloc(sizeof(*port), GFP_KERNEL);
765         if (port == NULL)
766                 return -ENOMEM;
767 
768         port->passthru = false;
769         port->dev = dev;
770         INIT_LIST_HEAD(&port->vlans);
771         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
772                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
773 
774         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
775         if (err)
776                 kfree(port);
777         else
778                 dev->priv_flags |= IFF_MACVLAN_PORT;
779         return err;
780 }
781 
782 static void macvlan_port_destroy(struct net_device *dev)
783 {
784         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
785 
786         dev->priv_flags &= ~IFF_MACVLAN_PORT;
787         netdev_rx_handler_unregister(dev);
788         kfree_rcu(port, rcu);
789 }
790 
791 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
792 {
793         if (tb[IFLA_ADDRESS]) {
794                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
795                         return -EINVAL;
796                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
797                         return -EADDRNOTAVAIL;
798         }
799 
800         if (data && data[IFLA_MACVLAN_FLAGS] &&
801             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
802                 return -EINVAL;
803 
804         if (data && data[IFLA_MACVLAN_MODE]) {
805                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
806                 case MACVLAN_MODE_PRIVATE:
807                 case MACVLAN_MODE_VEPA:
808                 case MACVLAN_MODE_BRIDGE:
809                 case MACVLAN_MODE_PASSTHRU:
810                         break;
811                 default:
812                         return -EINVAL;
813                 }
814         }
815         return 0;
816 }
817 
818 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
819                            struct nlattr *tb[], struct nlattr *data[])
820 {
821         struct macvlan_dev *vlan = netdev_priv(dev);
822         struct macvlan_port *port;
823         struct net_device *lowerdev;
824         int err;
825 
826         if (!tb[IFLA_LINK])
827                 return -EINVAL;
828 
829         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
830         if (lowerdev == NULL)
831                 return -ENODEV;
832 
833         /* When creating macvlans or macvtaps on top of other macvlans - use
834          * the real device as the lowerdev.
835          */
836         if (netif_is_macvlan(lowerdev))
837                 lowerdev = macvlan_dev_real_dev(lowerdev);
838 
839         if (!tb[IFLA_MTU])
840                 dev->mtu = lowerdev->mtu;
841         else if (dev->mtu > lowerdev->mtu)
842                 return -EINVAL;
843 
844         if (!tb[IFLA_ADDRESS])
845                 eth_hw_addr_random(dev);
846 
847         if (!macvlan_port_exists(lowerdev)) {
848                 err = macvlan_port_create(lowerdev);
849                 if (err < 0)
850                         return err;
851         }
852         port = macvlan_port_get_rtnl(lowerdev);
853 
854         /* Only 1 macvlan device can be created in passthru mode */
855         if (port->passthru)
856                 return -EINVAL;
857 
858         vlan->lowerdev = lowerdev;
859         vlan->dev      = dev;
860         vlan->port     = port;
861         vlan->set_features = MACVLAN_FEATURES;
862 
863         vlan->mode     = MACVLAN_MODE_VEPA;
864         if (data && data[IFLA_MACVLAN_MODE])
865                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
866 
867         if (data && data[IFLA_MACVLAN_FLAGS])
868                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
869 
870         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
871                 if (port->count)
872                         return -EINVAL;
873                 port->passthru = true;
874                 eth_hw_addr_inherit(dev, lowerdev);
875         }
876 
877         port->count += 1;
878         err = register_netdevice(dev);
879         if (err < 0)
880                 goto destroy_port;
881 
882         dev->priv_flags |= IFF_MACVLAN;
883         err = netdev_upper_dev_link(lowerdev, dev);
884         if (err)
885                 goto unregister_netdev;
886 
887         list_add_tail_rcu(&vlan->list, &port->vlans);
888         netif_stacked_transfer_operstate(lowerdev, dev);
889 
890         return 0;
891 
892 unregister_netdev:
893         unregister_netdevice(dev);
894 destroy_port:
895         port->count -= 1;
896         if (!port->count)
897                 macvlan_port_destroy(lowerdev);
898 
899         return err;
900 }
901 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
902 
903 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
904                            struct nlattr *tb[], struct nlattr *data[])
905 {
906         return macvlan_common_newlink(src_net, dev, tb, data);
907 }
908 
909 void macvlan_dellink(struct net_device *dev, struct list_head *head)
910 {
911         struct macvlan_dev *vlan = netdev_priv(dev);
912 
913         list_del_rcu(&vlan->list);
914         unregister_netdevice_queue(dev, head);
915         netdev_upper_dev_unlink(vlan->lowerdev, dev);
916 }
917 EXPORT_SYMBOL_GPL(macvlan_dellink);
918 
919 static int macvlan_changelink(struct net_device *dev,
920                 struct nlattr *tb[], struct nlattr *data[])
921 {
922         struct macvlan_dev *vlan = netdev_priv(dev);
923         enum macvlan_mode mode;
924         bool set_mode = false;
925 
926         /* Validate mode, but don't set yet: setting flags may fail. */
927         if (data && data[IFLA_MACVLAN_MODE]) {
928                 set_mode = true;
929                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
930                 /* Passthrough mode can't be set or cleared dynamically */
931                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
932                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
933                         return -EINVAL;
934         }
935 
936         if (data && data[IFLA_MACVLAN_FLAGS]) {
937                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
938                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
939                 if (vlan->port->passthru && promisc) {
940                         int err;
941 
942                         if (flags & MACVLAN_FLAG_NOPROMISC)
943                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
944                         else
945                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
946                         if (err < 0)
947                                 return err;
948                 }
949                 vlan->flags = flags;
950         }
951         if (set_mode)
952                 vlan->mode = mode;
953         return 0;
954 }
955 
956 static size_t macvlan_get_size(const struct net_device *dev)
957 {
958         return (0
959                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
960                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
961                 );
962 }
963 
964 static int macvlan_fill_info(struct sk_buff *skb,
965                                 const struct net_device *dev)
966 {
967         struct macvlan_dev *vlan = netdev_priv(dev);
968 
969         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
970                 goto nla_put_failure;
971         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
972                 goto nla_put_failure;
973         return 0;
974 
975 nla_put_failure:
976         return -EMSGSIZE;
977 }
978 
979 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
980         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
981         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
982 };
983 
984 int macvlan_link_register(struct rtnl_link_ops *ops)
985 {
986         /* common fields */
987         ops->priv_size          = sizeof(struct macvlan_dev);
988         ops->validate           = macvlan_validate;
989         ops->maxtype            = IFLA_MACVLAN_MAX;
990         ops->policy             = macvlan_policy;
991         ops->changelink         = macvlan_changelink;
992         ops->get_size           = macvlan_get_size;
993         ops->fill_info          = macvlan_fill_info;
994 
995         return rtnl_link_register(ops);
996 };
997 EXPORT_SYMBOL_GPL(macvlan_link_register);
998 
999 static struct rtnl_link_ops macvlan_link_ops = {
1000         .kind           = "macvlan",
1001         .setup          = macvlan_setup,
1002         .newlink        = macvlan_newlink,
1003         .dellink        = macvlan_dellink,
1004 };
1005 
1006 static int macvlan_device_event(struct notifier_block *unused,
1007                                 unsigned long event, void *ptr)
1008 {
1009         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1010         struct macvlan_dev *vlan, *next;
1011         struct macvlan_port *port;
1012         LIST_HEAD(list_kill);
1013 
1014         if (!macvlan_port_exists(dev))
1015                 return NOTIFY_DONE;
1016 
1017         port = macvlan_port_get_rtnl(dev);
1018 
1019         switch (event) {
1020         case NETDEV_CHANGE:
1021                 list_for_each_entry(vlan, &port->vlans, list)
1022                         netif_stacked_transfer_operstate(vlan->lowerdev,
1023                                                          vlan->dev);
1024                 break;
1025         case NETDEV_FEAT_CHANGE:
1026                 list_for_each_entry(vlan, &port->vlans, list) {
1027                         vlan->dev->gso_max_size = dev->gso_max_size;
1028                         netdev_update_features(vlan->dev);
1029                 }
1030                 break;
1031         case NETDEV_UNREGISTER:
1032                 /* twiddle thumbs on netns device moves */
1033                 if (dev->reg_state != NETREG_UNREGISTERING)
1034                         break;
1035 
1036                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1037                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1038                 unregister_netdevice_many(&list_kill);
1039                 list_del(&list_kill);
1040                 break;
1041         case NETDEV_PRE_TYPE_CHANGE:
1042                 /* Forbid underlaying device to change its type. */
1043                 return NOTIFY_BAD;
1044         }
1045         return NOTIFY_DONE;
1046 }
1047 
1048 static struct notifier_block macvlan_notifier_block __read_mostly = {
1049         .notifier_call  = macvlan_device_event,
1050 };
1051 
1052 static int __init macvlan_init_module(void)
1053 {
1054         int err;
1055 
1056         register_netdevice_notifier(&macvlan_notifier_block);
1057 
1058         err = macvlan_link_register(&macvlan_link_ops);
1059         if (err < 0)
1060                 goto err1;
1061         return 0;
1062 err1:
1063         unregister_netdevice_notifier(&macvlan_notifier_block);
1064         return err;
1065 }
1066 
1067 static void __exit macvlan_cleanup_module(void)
1068 {
1069         rtnl_link_unregister(&macvlan_link_ops);
1070         unregister_netdevice_notifier(&macvlan_notifier_block);
1071 }
1072 
1073 module_init(macvlan_init_module);
1074 module_exit(macvlan_cleanup_module);
1075 
1076 MODULE_LICENSE("GPL");
1077 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1078 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1079 MODULE_ALIAS_RTNL_LINK("macvlan");
1080 

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