Version:  2.0.40 2.2.26 2.4.37 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 3.15

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 
267         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
268                 const struct ethhdr *eth = (void *)skb->data;
269 
270                 /* send to other bridge ports directly */
271                 if (is_multicast_ether_addr(eth->h_dest)) {
272                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
273                         goto xmit_world;
274                 }
275 
276                 dest = macvlan_hash_lookup(port, eth->h_dest);
277                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
278                         /* send to lowerdev first for its network taps */
279                         dev_forward_skb(vlan->lowerdev, skb);
280 
281                         return NET_XMIT_SUCCESS;
282                 }
283         }
284 
285 xmit_world:
286         skb->dev = vlan->lowerdev;
287         return dev_queue_xmit(skb);
288 }
289 
290 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
291                                       struct net_device *dev)
292 {
293         unsigned int len = skb->len;
294         int ret;
295         const struct macvlan_dev *vlan = netdev_priv(dev);
296 
297         if (vlan->fwd_priv) {
298                 skb->dev = vlan->lowerdev;
299                 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
300         } else {
301                 ret = macvlan_queue_xmit(skb, dev);
302         }
303 
304         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
305                 struct vlan_pcpu_stats *pcpu_stats;
306 
307                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
308                 u64_stats_update_begin(&pcpu_stats->syncp);
309                 pcpu_stats->tx_packets++;
310                 pcpu_stats->tx_bytes += len;
311                 u64_stats_update_end(&pcpu_stats->syncp);
312         } else {
313                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
314         }
315         return ret;
316 }
317 
318 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
319                                unsigned short type, const void *daddr,
320                                const void *saddr, unsigned len)
321 {
322         const struct macvlan_dev *vlan = netdev_priv(dev);
323         struct net_device *lowerdev = vlan->lowerdev;
324 
325         return dev_hard_header(skb, lowerdev, type, daddr,
326                                saddr ? : dev->dev_addr, len);
327 }
328 
329 static const struct header_ops macvlan_hard_header_ops = {
330         .create         = macvlan_hard_header,
331         .rebuild        = eth_rebuild_header,
332         .parse          = eth_header_parse,
333         .cache          = eth_header_cache,
334         .cache_update   = eth_header_cache_update,
335 };
336 
337 static struct rtnl_link_ops macvlan_link_ops;
338 
339 static int macvlan_open(struct net_device *dev)
340 {
341         struct macvlan_dev *vlan = netdev_priv(dev);
342         struct net_device *lowerdev = vlan->lowerdev;
343         int err;
344 
345         if (vlan->port->passthru) {
346                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
347                         err = dev_set_promiscuity(lowerdev, 1);
348                         if (err < 0)
349                                 goto out;
350                 }
351                 goto hash_add;
352         }
353 
354         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
355             dev->rtnl_link_ops == &macvlan_link_ops) {
356                 vlan->fwd_priv =
357                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
358 
359                 /* If we get a NULL pointer back, or if we get an error
360                  * then we should just fall through to the non accelerated path
361                  */
362                 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
363                         vlan->fwd_priv = NULL;
364                 } else
365                         return 0;
366         }
367 
368         err = -EBUSY;
369         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
370                 goto out;
371 
372         err = dev_uc_add(lowerdev, dev->dev_addr);
373         if (err < 0)
374                 goto out;
375         if (dev->flags & IFF_ALLMULTI) {
376                 err = dev_set_allmulti(lowerdev, 1);
377                 if (err < 0)
378                         goto del_unicast;
379         }
380 
381 hash_add:
382         macvlan_hash_add(vlan);
383         return 0;
384 
385 del_unicast:
386         dev_uc_del(lowerdev, dev->dev_addr);
387 out:
388         if (vlan->fwd_priv) {
389                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
390                                                            vlan->fwd_priv);
391                 vlan->fwd_priv = NULL;
392         }
393         return err;
394 }
395 
396 static int macvlan_stop(struct net_device *dev)
397 {
398         struct macvlan_dev *vlan = netdev_priv(dev);
399         struct net_device *lowerdev = vlan->lowerdev;
400 
401         if (vlan->fwd_priv) {
402                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
403                                                            vlan->fwd_priv);
404                 vlan->fwd_priv = NULL;
405                 return 0;
406         }
407 
408         dev_uc_unsync(lowerdev, dev);
409         dev_mc_unsync(lowerdev, dev);
410 
411         if (vlan->port->passthru) {
412                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
413                         dev_set_promiscuity(lowerdev, -1);
414                 goto hash_del;
415         }
416 
417         if (dev->flags & IFF_ALLMULTI)
418                 dev_set_allmulti(lowerdev, -1);
419 
420         dev_uc_del(lowerdev, dev->dev_addr);
421 
422 hash_del:
423         macvlan_hash_del(vlan, !dev->dismantle);
424         return 0;
425 }
426 
427 static int macvlan_set_mac_address(struct net_device *dev, void *p)
428 {
429         struct macvlan_dev *vlan = netdev_priv(dev);
430         struct net_device *lowerdev = vlan->lowerdev;
431         struct sockaddr *addr = p;
432         int err;
433 
434         if (!is_valid_ether_addr(addr->sa_data))
435                 return -EADDRNOTAVAIL;
436 
437         if (!(dev->flags & IFF_UP)) {
438                 /* Just copy in the new address */
439                 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
440         } else {
441                 /* Rehash and update the device filters */
442                 if (macvlan_addr_busy(vlan->port, addr->sa_data))
443                         return -EBUSY;
444 
445                 err = dev_uc_add(lowerdev, addr->sa_data);
446                 if (err)
447                         return err;
448 
449                 dev_uc_del(lowerdev, dev->dev_addr);
450 
451                 macvlan_hash_change_addr(vlan, addr->sa_data);
452         }
453         return 0;
454 }
455 
456 static void macvlan_change_rx_flags(struct net_device *dev, int change)
457 {
458         struct macvlan_dev *vlan = netdev_priv(dev);
459         struct net_device *lowerdev = vlan->lowerdev;
460 
461         if (dev->flags & IFF_UP) {
462                 if (change & IFF_ALLMULTI)
463                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
464         }
465 }
466 
467 static void macvlan_set_mac_lists(struct net_device *dev)
468 {
469         struct macvlan_dev *vlan = netdev_priv(dev);
470 
471         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
472                 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
473         } else {
474                 struct netdev_hw_addr *ha;
475                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
476 
477                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
478                 netdev_for_each_mc_addr(ha, dev) {
479                         __set_bit(mc_hash(vlan, ha->addr), filter);
480                 }
481 
482                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
483 
484                 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
485         }
486         dev_uc_sync(vlan->lowerdev, dev);
487         dev_mc_sync(vlan->lowerdev, dev);
488 }
489 
490 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
491 {
492         struct macvlan_dev *vlan = netdev_priv(dev);
493 
494         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
495                 return -EINVAL;
496         dev->mtu = new_mtu;
497         return 0;
498 }
499 
500 /*
501  * macvlan network devices have devices nesting below it and are a special
502  * "super class" of normal network devices; split their locks off into a
503  * separate class since they always nest.
504  */
505 static struct lock_class_key macvlan_netdev_xmit_lock_key;
506 static struct lock_class_key macvlan_netdev_addr_lock_key;
507 
508 #define ALWAYS_ON_FEATURES \
509         (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX)
510 
511 #define MACVLAN_FEATURES \
512         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
513          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
514          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
515          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
516 
517 #define MACVLAN_STATE_MASK \
518         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
519 
520 static int macvlan_get_nest_level(struct net_device *dev)
521 {
522         return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
523 }
524 
525 static void macvlan_set_lockdep_class_one(struct net_device *dev,
526                                           struct netdev_queue *txq,
527                                           void *_unused)
528 {
529         lockdep_set_class(&txq->_xmit_lock,
530                           &macvlan_netdev_xmit_lock_key);
531 }
532 
533 static void macvlan_set_lockdep_class(struct net_device *dev)
534 {
535         lockdep_set_class_and_subclass(&dev->addr_list_lock,
536                                        &macvlan_netdev_addr_lock_key,
537                                        macvlan_get_nest_level(dev));
538         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
539 }
540 
541 static int macvlan_init(struct net_device *dev)
542 {
543         struct macvlan_dev *vlan = netdev_priv(dev);
544         const struct net_device *lowerdev = vlan->lowerdev;
545 
546         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
547                                   (lowerdev->state & MACVLAN_STATE_MASK);
548         dev->features           = lowerdev->features & MACVLAN_FEATURES;
549         dev->features           |= ALWAYS_ON_FEATURES;
550         dev->gso_max_size       = lowerdev->gso_max_size;
551         dev->iflink             = lowerdev->ifindex;
552         dev->hard_header_len    = lowerdev->hard_header_len;
553 
554         macvlan_set_lockdep_class(dev);
555 
556         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
557         if (!vlan->pcpu_stats)
558                 return -ENOMEM;
559 
560         return 0;
561 }
562 
563 static void macvlan_uninit(struct net_device *dev)
564 {
565         struct macvlan_dev *vlan = netdev_priv(dev);
566         struct macvlan_port *port = vlan->port;
567 
568         free_percpu(vlan->pcpu_stats);
569 
570         port->count -= 1;
571         if (!port->count)
572                 macvlan_port_destroy(port->dev);
573 }
574 
575 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
576                                                          struct rtnl_link_stats64 *stats)
577 {
578         struct macvlan_dev *vlan = netdev_priv(dev);
579 
580         if (vlan->pcpu_stats) {
581                 struct vlan_pcpu_stats *p;
582                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
583                 u32 rx_errors = 0, tx_dropped = 0;
584                 unsigned int start;
585                 int i;
586 
587                 for_each_possible_cpu(i) {
588                         p = per_cpu_ptr(vlan->pcpu_stats, i);
589                         do {
590                                 start = u64_stats_fetch_begin_irq(&p->syncp);
591                                 rx_packets      = p->rx_packets;
592                                 rx_bytes        = p->rx_bytes;
593                                 rx_multicast    = p->rx_multicast;
594                                 tx_packets      = p->tx_packets;
595                                 tx_bytes        = p->tx_bytes;
596                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
597 
598                         stats->rx_packets       += rx_packets;
599                         stats->rx_bytes         += rx_bytes;
600                         stats->multicast        += rx_multicast;
601                         stats->tx_packets       += tx_packets;
602                         stats->tx_bytes         += tx_bytes;
603                         /* rx_errors & tx_dropped are u32, updated
604                          * without syncp protection.
605                          */
606                         rx_errors       += p->rx_errors;
607                         tx_dropped      += p->tx_dropped;
608                 }
609                 stats->rx_errors        = rx_errors;
610                 stats->rx_dropped       = rx_errors;
611                 stats->tx_dropped       = tx_dropped;
612         }
613         return stats;
614 }
615 
616 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
617                                    __be16 proto, u16 vid)
618 {
619         struct macvlan_dev *vlan = netdev_priv(dev);
620         struct net_device *lowerdev = vlan->lowerdev;
621 
622         return vlan_vid_add(lowerdev, proto, vid);
623 }
624 
625 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
626                                     __be16 proto, u16 vid)
627 {
628         struct macvlan_dev *vlan = netdev_priv(dev);
629         struct net_device *lowerdev = vlan->lowerdev;
630 
631         vlan_vid_del(lowerdev, proto, vid);
632         return 0;
633 }
634 
635 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
636                            struct net_device *dev,
637                            const unsigned char *addr,
638                            u16 flags)
639 {
640         struct macvlan_dev *vlan = netdev_priv(dev);
641         int err = -EINVAL;
642 
643         if (!vlan->port->passthru)
644                 return -EOPNOTSUPP;
645 
646         if (flags & NLM_F_REPLACE)
647                 return -EOPNOTSUPP;
648 
649         if (is_unicast_ether_addr(addr))
650                 err = dev_uc_add_excl(dev, addr);
651         else if (is_multicast_ether_addr(addr))
652                 err = dev_mc_add_excl(dev, addr);
653 
654         return err;
655 }
656 
657 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
658                            struct net_device *dev,
659                            const unsigned char *addr)
660 {
661         struct macvlan_dev *vlan = netdev_priv(dev);
662         int err = -EINVAL;
663 
664         if (!vlan->port->passthru)
665                 return -EOPNOTSUPP;
666 
667         if (is_unicast_ether_addr(addr))
668                 err = dev_uc_del(dev, addr);
669         else if (is_multicast_ether_addr(addr))
670                 err = dev_mc_del(dev, addr);
671 
672         return err;
673 }
674 
675 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
676                                         struct ethtool_drvinfo *drvinfo)
677 {
678         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
679         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
680 }
681 
682 static int macvlan_ethtool_get_settings(struct net_device *dev,
683                                         struct ethtool_cmd *cmd)
684 {
685         const struct macvlan_dev *vlan = netdev_priv(dev);
686 
687         return __ethtool_get_settings(vlan->lowerdev, cmd);
688 }
689 
690 static netdev_features_t macvlan_fix_features(struct net_device *dev,
691                                               netdev_features_t features)
692 {
693         struct macvlan_dev *vlan = netdev_priv(dev);
694         netdev_features_t mask;
695 
696         features |= NETIF_F_ALL_FOR_ALL;
697         features &= (vlan->set_features | ~MACVLAN_FEATURES);
698         mask = features;
699 
700         features = netdev_increment_features(vlan->lowerdev->features,
701                                              features,
702                                              mask);
703         features |= ALWAYS_ON_FEATURES;
704 
705         return features;
706 }
707 
708 static const struct ethtool_ops macvlan_ethtool_ops = {
709         .get_link               = ethtool_op_get_link,
710         .get_settings           = macvlan_ethtool_get_settings,
711         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
712 };
713 
714 static const struct net_device_ops macvlan_netdev_ops = {
715         .ndo_init               = macvlan_init,
716         .ndo_uninit             = macvlan_uninit,
717         .ndo_open               = macvlan_open,
718         .ndo_stop               = macvlan_stop,
719         .ndo_start_xmit         = macvlan_start_xmit,
720         .ndo_change_mtu         = macvlan_change_mtu,
721         .ndo_fix_features       = macvlan_fix_features,
722         .ndo_change_rx_flags    = macvlan_change_rx_flags,
723         .ndo_set_mac_address    = macvlan_set_mac_address,
724         .ndo_set_rx_mode        = macvlan_set_mac_lists,
725         .ndo_get_stats64        = macvlan_dev_get_stats64,
726         .ndo_validate_addr      = eth_validate_addr,
727         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
728         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
729         .ndo_fdb_add            = macvlan_fdb_add,
730         .ndo_fdb_del            = macvlan_fdb_del,
731         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
732         .ndo_get_lock_subclass  = macvlan_get_nest_level,
733 };
734 
735 void macvlan_common_setup(struct net_device *dev)
736 {
737         ether_setup(dev);
738 
739         dev->priv_flags        &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
740         dev->priv_flags        |= IFF_UNICAST_FLT;
741         dev->netdev_ops         = &macvlan_netdev_ops;
742         dev->destructor         = free_netdev;
743         dev->header_ops         = &macvlan_hard_header_ops;
744         dev->ethtool_ops        = &macvlan_ethtool_ops;
745 }
746 EXPORT_SYMBOL_GPL(macvlan_common_setup);
747 
748 static void macvlan_setup(struct net_device *dev)
749 {
750         macvlan_common_setup(dev);
751         dev->tx_queue_len       = 0;
752 }
753 
754 static int macvlan_port_create(struct net_device *dev)
755 {
756         struct macvlan_port *port;
757         unsigned int i;
758         int err;
759 
760         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
761                 return -EINVAL;
762 
763         port = kzalloc(sizeof(*port), GFP_KERNEL);
764         if (port == NULL)
765                 return -ENOMEM;
766 
767         port->passthru = false;
768         port->dev = dev;
769         INIT_LIST_HEAD(&port->vlans);
770         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
771                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
772 
773         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
774         if (err)
775                 kfree(port);
776         else
777                 dev->priv_flags |= IFF_MACVLAN_PORT;
778         return err;
779 }
780 
781 static void macvlan_port_destroy(struct net_device *dev)
782 {
783         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
784 
785         dev->priv_flags &= ~IFF_MACVLAN_PORT;
786         netdev_rx_handler_unregister(dev);
787         kfree_rcu(port, rcu);
788 }
789 
790 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
791 {
792         if (tb[IFLA_ADDRESS]) {
793                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
794                         return -EINVAL;
795                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
796                         return -EADDRNOTAVAIL;
797         }
798 
799         if (data && data[IFLA_MACVLAN_FLAGS] &&
800             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
801                 return -EINVAL;
802 
803         if (data && data[IFLA_MACVLAN_MODE]) {
804                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
805                 case MACVLAN_MODE_PRIVATE:
806                 case MACVLAN_MODE_VEPA:
807                 case MACVLAN_MODE_BRIDGE:
808                 case MACVLAN_MODE_PASSTHRU:
809                         break;
810                 default:
811                         return -EINVAL;
812                 }
813         }
814         return 0;
815 }
816 
817 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
818                            struct nlattr *tb[], struct nlattr *data[])
819 {
820         struct macvlan_dev *vlan = netdev_priv(dev);
821         struct macvlan_port *port;
822         struct net_device *lowerdev;
823         int err;
824 
825         if (!tb[IFLA_LINK])
826                 return -EINVAL;
827 
828         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
829         if (lowerdev == NULL)
830                 return -ENODEV;
831 
832         /* When creating macvlans or macvtaps on top of other macvlans - use
833          * the real device as the lowerdev.
834          */
835         if (netif_is_macvlan(lowerdev))
836                 lowerdev = macvlan_dev_real_dev(lowerdev);
837 
838         if (!tb[IFLA_MTU])
839                 dev->mtu = lowerdev->mtu;
840         else if (dev->mtu > lowerdev->mtu)
841                 return -EINVAL;
842 
843         if (!tb[IFLA_ADDRESS])
844                 eth_hw_addr_random(dev);
845 
846         if (!macvlan_port_exists(lowerdev)) {
847                 err = macvlan_port_create(lowerdev);
848                 if (err < 0)
849                         return err;
850         }
851         port = macvlan_port_get_rtnl(lowerdev);
852 
853         /* Only 1 macvlan device can be created in passthru mode */
854         if (port->passthru)
855                 return -EINVAL;
856 
857         vlan->lowerdev = lowerdev;
858         vlan->dev      = dev;
859         vlan->port     = port;
860         vlan->set_features = MACVLAN_FEATURES;
861         vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
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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