Merge tag 'perf-urgent-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git...
[platform/adaptation/renesas_rcar/renesas_kernel.git] / 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 MACVLAN_FEATURES \
510         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
511          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
512          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
513          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
514
515 #define MACVLAN_STATE_MASK \
516         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
517
518 static void macvlan_set_lockdep_class_one(struct net_device *dev,
519                                           struct netdev_queue *txq,
520                                           void *_unused)
521 {
522         lockdep_set_class(&txq->_xmit_lock,
523                           &macvlan_netdev_xmit_lock_key);
524 }
525
526 static void macvlan_set_lockdep_class(struct net_device *dev)
527 {
528         lockdep_set_class(&dev->addr_list_lock,
529                           &macvlan_netdev_addr_lock_key);
530         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
531 }
532
533 static int macvlan_init(struct net_device *dev)
534 {
535         struct macvlan_dev *vlan = netdev_priv(dev);
536         const struct net_device *lowerdev = vlan->lowerdev;
537         int i;
538
539         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
540                                   (lowerdev->state & MACVLAN_STATE_MASK);
541         dev->features           = lowerdev->features & MACVLAN_FEATURES;
542         dev->features           |= NETIF_F_LLTX;
543         dev->gso_max_size       = lowerdev->gso_max_size;
544         dev->iflink             = lowerdev->ifindex;
545         dev->hard_header_len    = lowerdev->hard_header_len;
546
547         macvlan_set_lockdep_class(dev);
548
549         vlan->pcpu_stats = alloc_percpu(struct vlan_pcpu_stats);
550         if (!vlan->pcpu_stats)
551                 return -ENOMEM;
552
553         for_each_possible_cpu(i) {
554                 struct vlan_pcpu_stats *mvlstats;
555                 mvlstats = per_cpu_ptr(vlan->pcpu_stats, i);
556                 u64_stats_init(&mvlstats->syncp);
557         }
558
559         return 0;
560 }
561
562 static void macvlan_uninit(struct net_device *dev)
563 {
564         struct macvlan_dev *vlan = netdev_priv(dev);
565         struct macvlan_port *port = vlan->port;
566
567         free_percpu(vlan->pcpu_stats);
568
569         port->count -= 1;
570         if (!port->count)
571                 macvlan_port_destroy(port->dev);
572 }
573
574 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
575                                                          struct rtnl_link_stats64 *stats)
576 {
577         struct macvlan_dev *vlan = netdev_priv(dev);
578
579         if (vlan->pcpu_stats) {
580                 struct vlan_pcpu_stats *p;
581                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
582                 u32 rx_errors = 0, tx_dropped = 0;
583                 unsigned int start;
584                 int i;
585
586                 for_each_possible_cpu(i) {
587                         p = per_cpu_ptr(vlan->pcpu_stats, i);
588                         do {
589                                 start = u64_stats_fetch_begin_bh(&p->syncp);
590                                 rx_packets      = p->rx_packets;
591                                 rx_bytes        = p->rx_bytes;
592                                 rx_multicast    = p->rx_multicast;
593                                 tx_packets      = p->tx_packets;
594                                 tx_bytes        = p->tx_bytes;
595                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
596
597                         stats->rx_packets       += rx_packets;
598                         stats->rx_bytes         += rx_bytes;
599                         stats->multicast        += rx_multicast;
600                         stats->tx_packets       += tx_packets;
601                         stats->tx_bytes         += tx_bytes;
602                         /* rx_errors & tx_dropped are u32, updated
603                          * without syncp protection.
604                          */
605                         rx_errors       += p->rx_errors;
606                         tx_dropped      += p->tx_dropped;
607                 }
608                 stats->rx_errors        = rx_errors;
609                 stats->rx_dropped       = rx_errors;
610                 stats->tx_dropped       = tx_dropped;
611         }
612         return stats;
613 }
614
615 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
616                                    __be16 proto, u16 vid)
617 {
618         struct macvlan_dev *vlan = netdev_priv(dev);
619         struct net_device *lowerdev = vlan->lowerdev;
620
621         return vlan_vid_add(lowerdev, proto, vid);
622 }
623
624 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
625                                     __be16 proto, u16 vid)
626 {
627         struct macvlan_dev *vlan = netdev_priv(dev);
628         struct net_device *lowerdev = vlan->lowerdev;
629
630         vlan_vid_del(lowerdev, proto, vid);
631         return 0;
632 }
633
634 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
635                            struct net_device *dev,
636                            const unsigned char *addr,
637                            u16 flags)
638 {
639         struct macvlan_dev *vlan = netdev_priv(dev);
640         int err = -EINVAL;
641
642         if (!vlan->port->passthru)
643                 return -EOPNOTSUPP;
644
645         if (flags & NLM_F_REPLACE)
646                 return -EOPNOTSUPP;
647
648         if (is_unicast_ether_addr(addr))
649                 err = dev_uc_add_excl(dev, addr);
650         else if (is_multicast_ether_addr(addr))
651                 err = dev_mc_add_excl(dev, addr);
652
653         return err;
654 }
655
656 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
657                            struct net_device *dev,
658                            const unsigned char *addr)
659 {
660         struct macvlan_dev *vlan = netdev_priv(dev);
661         int err = -EINVAL;
662
663         if (!vlan->port->passthru)
664                 return -EOPNOTSUPP;
665
666         if (is_unicast_ether_addr(addr))
667                 err = dev_uc_del(dev, addr);
668         else if (is_multicast_ether_addr(addr))
669                 err = dev_mc_del(dev, addr);
670
671         return err;
672 }
673
674 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
675                                         struct ethtool_drvinfo *drvinfo)
676 {
677         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
678         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
679 }
680
681 static int macvlan_ethtool_get_settings(struct net_device *dev,
682                                         struct ethtool_cmd *cmd)
683 {
684         const struct macvlan_dev *vlan = netdev_priv(dev);
685
686         return __ethtool_get_settings(vlan->lowerdev, cmd);
687 }
688
689 static netdev_features_t macvlan_fix_features(struct net_device *dev,
690                                               netdev_features_t features)
691 {
692         struct macvlan_dev *vlan = netdev_priv(dev);
693         netdev_features_t mask;
694
695         features |= NETIF_F_ALL_FOR_ALL;
696         features &= (vlan->set_features | ~MACVLAN_FEATURES);
697         mask = features;
698
699         features = netdev_increment_features(vlan->lowerdev->features,
700                                              features,
701                                              mask);
702         features |= NETIF_F_LLTX;
703
704         return features;
705 }
706
707 static const struct ethtool_ops macvlan_ethtool_ops = {
708         .get_link               = ethtool_op_get_link,
709         .get_settings           = macvlan_ethtool_get_settings,
710         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
711 };
712
713 static const struct net_device_ops macvlan_netdev_ops = {
714         .ndo_init               = macvlan_init,
715         .ndo_uninit             = macvlan_uninit,
716         .ndo_open               = macvlan_open,
717         .ndo_stop               = macvlan_stop,
718         .ndo_start_xmit         = macvlan_start_xmit,
719         .ndo_change_mtu         = macvlan_change_mtu,
720         .ndo_fix_features       = macvlan_fix_features,
721         .ndo_change_rx_flags    = macvlan_change_rx_flags,
722         .ndo_set_mac_address    = macvlan_set_mac_address,
723         .ndo_set_rx_mode        = macvlan_set_mac_lists,
724         .ndo_get_stats64        = macvlan_dev_get_stats64,
725         .ndo_validate_addr      = eth_validate_addr,
726         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
727         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
728         .ndo_fdb_add            = macvlan_fdb_add,
729         .ndo_fdb_del            = macvlan_fdb_del,
730         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
731 };
732
733 void macvlan_common_setup(struct net_device *dev)
734 {
735         ether_setup(dev);
736
737         dev->priv_flags        &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
738         dev->priv_flags        |= IFF_UNICAST_FLT;
739         dev->netdev_ops         = &macvlan_netdev_ops;
740         dev->destructor         = free_netdev;
741         dev->header_ops         = &macvlan_hard_header_ops;
742         dev->ethtool_ops        = &macvlan_ethtool_ops;
743 }
744 EXPORT_SYMBOL_GPL(macvlan_common_setup);
745
746 static void macvlan_setup(struct net_device *dev)
747 {
748         macvlan_common_setup(dev);
749         dev->tx_queue_len       = 0;
750 }
751
752 static int macvlan_port_create(struct net_device *dev)
753 {
754         struct macvlan_port *port;
755         unsigned int i;
756         int err;
757
758         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
759                 return -EINVAL;
760
761         port = kzalloc(sizeof(*port), GFP_KERNEL);
762         if (port == NULL)
763                 return -ENOMEM;
764
765         port->passthru = false;
766         port->dev = dev;
767         INIT_LIST_HEAD(&port->vlans);
768         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
769                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
770
771         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
772         if (err)
773                 kfree(port);
774         else
775                 dev->priv_flags |= IFF_MACVLAN_PORT;
776         return err;
777 }
778
779 static void macvlan_port_destroy(struct net_device *dev)
780 {
781         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
782
783         dev->priv_flags &= ~IFF_MACVLAN_PORT;
784         netdev_rx_handler_unregister(dev);
785         kfree_rcu(port, rcu);
786 }
787
788 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
789 {
790         if (tb[IFLA_ADDRESS]) {
791                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
792                         return -EINVAL;
793                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
794                         return -EADDRNOTAVAIL;
795         }
796
797         if (data && data[IFLA_MACVLAN_FLAGS] &&
798             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
799                 return -EINVAL;
800
801         if (data && data[IFLA_MACVLAN_MODE]) {
802                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
803                 case MACVLAN_MODE_PRIVATE:
804                 case MACVLAN_MODE_VEPA:
805                 case MACVLAN_MODE_BRIDGE:
806                 case MACVLAN_MODE_PASSTHRU:
807                         break;
808                 default:
809                         return -EINVAL;
810                 }
811         }
812         return 0;
813 }
814
815 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
816                            struct nlattr *tb[], struct nlattr *data[])
817 {
818         struct macvlan_dev *vlan = netdev_priv(dev);
819         struct macvlan_port *port;
820         struct net_device *lowerdev;
821         int err;
822
823         if (!tb[IFLA_LINK])
824                 return -EINVAL;
825
826         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
827         if (lowerdev == NULL)
828                 return -ENODEV;
829
830         /* When creating macvlans or macvtaps on top of other macvlans - use
831          * the real device as the lowerdev.
832          */
833         if (netif_is_macvlan(lowerdev))
834                 lowerdev = macvlan_dev_real_dev(lowerdev);
835
836         if (!tb[IFLA_MTU])
837                 dev->mtu = lowerdev->mtu;
838         else if (dev->mtu > lowerdev->mtu)
839                 return -EINVAL;
840
841         if (!tb[IFLA_ADDRESS])
842                 eth_hw_addr_random(dev);
843
844         if (!macvlan_port_exists(lowerdev)) {
845                 err = macvlan_port_create(lowerdev);
846                 if (err < 0)
847                         return err;
848         }
849         port = macvlan_port_get_rtnl(lowerdev);
850
851         /* Only 1 macvlan device can be created in passthru mode */
852         if (port->passthru)
853                 return -EINVAL;
854
855         vlan->lowerdev = lowerdev;
856         vlan->dev      = dev;
857         vlan->port     = port;
858         vlan->set_features = MACVLAN_FEATURES;
859
860         vlan->mode     = MACVLAN_MODE_VEPA;
861         if (data && data[IFLA_MACVLAN_MODE])
862                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
863
864         if (data && data[IFLA_MACVLAN_FLAGS])
865                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
866
867         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
868                 if (port->count)
869                         return -EINVAL;
870                 port->passthru = true;
871                 eth_hw_addr_inherit(dev, lowerdev);
872         }
873
874         port->count += 1;
875         err = register_netdevice(dev);
876         if (err < 0)
877                 goto destroy_port;
878
879         dev->priv_flags |= IFF_MACVLAN;
880         err = netdev_upper_dev_link(lowerdev, dev);
881         if (err)
882                 goto unregister_netdev;
883
884         list_add_tail_rcu(&vlan->list, &port->vlans);
885         netif_stacked_transfer_operstate(lowerdev, dev);
886
887         return 0;
888
889 unregister_netdev:
890         unregister_netdevice(dev);
891 destroy_port:
892         port->count -= 1;
893         if (!port->count)
894                 macvlan_port_destroy(lowerdev);
895
896         return err;
897 }
898 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
899
900 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
901                            struct nlattr *tb[], struct nlattr *data[])
902 {
903         return macvlan_common_newlink(src_net, dev, tb, data);
904 }
905
906 void macvlan_dellink(struct net_device *dev, struct list_head *head)
907 {
908         struct macvlan_dev *vlan = netdev_priv(dev);
909
910         list_del_rcu(&vlan->list);
911         unregister_netdevice_queue(dev, head);
912         netdev_upper_dev_unlink(vlan->lowerdev, dev);
913 }
914 EXPORT_SYMBOL_GPL(macvlan_dellink);
915
916 static int macvlan_changelink(struct net_device *dev,
917                 struct nlattr *tb[], struct nlattr *data[])
918 {
919         struct macvlan_dev *vlan = netdev_priv(dev);
920         enum macvlan_mode mode;
921         bool set_mode = false;
922
923         /* Validate mode, but don't set yet: setting flags may fail. */
924         if (data && data[IFLA_MACVLAN_MODE]) {
925                 set_mode = true;
926                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
927                 /* Passthrough mode can't be set or cleared dynamically */
928                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
929                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
930                         return -EINVAL;
931         }
932
933         if (data && data[IFLA_MACVLAN_FLAGS]) {
934                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
935                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
936                 if (vlan->port->passthru && promisc) {
937                         int err;
938
939                         if (flags & MACVLAN_FLAG_NOPROMISC)
940                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
941                         else
942                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
943                         if (err < 0)
944                                 return err;
945                 }
946                 vlan->flags = flags;
947         }
948         if (set_mode)
949                 vlan->mode = mode;
950         return 0;
951 }
952
953 static size_t macvlan_get_size(const struct net_device *dev)
954 {
955         return (0
956                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
957                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
958                 );
959 }
960
961 static int macvlan_fill_info(struct sk_buff *skb,
962                                 const struct net_device *dev)
963 {
964         struct macvlan_dev *vlan = netdev_priv(dev);
965
966         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
967                 goto nla_put_failure;
968         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
969                 goto nla_put_failure;
970         return 0;
971
972 nla_put_failure:
973         return -EMSGSIZE;
974 }
975
976 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
977         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
978         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
979 };
980
981 int macvlan_link_register(struct rtnl_link_ops *ops)
982 {
983         /* common fields */
984         ops->priv_size          = sizeof(struct macvlan_dev);
985         ops->validate           = macvlan_validate;
986         ops->maxtype            = IFLA_MACVLAN_MAX;
987         ops->policy             = macvlan_policy;
988         ops->changelink         = macvlan_changelink;
989         ops->get_size           = macvlan_get_size;
990         ops->fill_info          = macvlan_fill_info;
991
992         return rtnl_link_register(ops);
993 };
994 EXPORT_SYMBOL_GPL(macvlan_link_register);
995
996 static struct rtnl_link_ops macvlan_link_ops = {
997         .kind           = "macvlan",
998         .setup          = macvlan_setup,
999         .newlink        = macvlan_newlink,
1000         .dellink        = macvlan_dellink,
1001 };
1002
1003 static int macvlan_device_event(struct notifier_block *unused,
1004                                 unsigned long event, void *ptr)
1005 {
1006         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1007         struct macvlan_dev *vlan, *next;
1008         struct macvlan_port *port;
1009         LIST_HEAD(list_kill);
1010
1011         if (!macvlan_port_exists(dev))
1012                 return NOTIFY_DONE;
1013
1014         port = macvlan_port_get_rtnl(dev);
1015
1016         switch (event) {
1017         case NETDEV_CHANGE:
1018                 list_for_each_entry(vlan, &port->vlans, list)
1019                         netif_stacked_transfer_operstate(vlan->lowerdev,
1020                                                          vlan->dev);
1021                 break;
1022         case NETDEV_FEAT_CHANGE:
1023                 list_for_each_entry(vlan, &port->vlans, list) {
1024                         vlan->dev->gso_max_size = dev->gso_max_size;
1025                         netdev_update_features(vlan->dev);
1026                 }
1027                 break;
1028         case NETDEV_UNREGISTER:
1029                 /* twiddle thumbs on netns device moves */
1030                 if (dev->reg_state != NETREG_UNREGISTERING)
1031                         break;
1032
1033                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1034                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1035                 unregister_netdevice_many(&list_kill);
1036                 list_del(&list_kill);
1037                 break;
1038         case NETDEV_PRE_TYPE_CHANGE:
1039                 /* Forbid underlaying device to change its type. */
1040                 return NOTIFY_BAD;
1041         }
1042         return NOTIFY_DONE;
1043 }
1044
1045 static struct notifier_block macvlan_notifier_block __read_mostly = {
1046         .notifier_call  = macvlan_device_event,
1047 };
1048
1049 static int __init macvlan_init_module(void)
1050 {
1051         int err;
1052
1053         register_netdevice_notifier(&macvlan_notifier_block);
1054
1055         err = macvlan_link_register(&macvlan_link_ops);
1056         if (err < 0)
1057                 goto err1;
1058         return 0;
1059 err1:
1060         unregister_netdevice_notifier(&macvlan_notifier_block);
1061         return err;
1062 }
1063
1064 static void __exit macvlan_cleanup_module(void)
1065 {
1066         rtnl_link_unregister(&macvlan_link_ops);
1067         unregister_netdevice_notifier(&macvlan_notifier_block);
1068 }
1069
1070 module_init(macvlan_init_module);
1071 module_exit(macvlan_cleanup_module);
1072
1073 MODULE_LICENSE("GPL");
1074 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1075 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1076 MODULE_ALIAS_RTNL_LINK("macvlan");