qlcnic: set gso_type
[~shefty/rdma-dev.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 <net/rtnetlink.h>
33 #include <net/xfrm.h>
34
35 #define MACVLAN_HASH_SIZE       (1 << BITS_PER_BYTE)
36
37 struct macvlan_port {
38         struct net_device       *dev;
39         struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
40         struct list_head        vlans;
41         struct rcu_head         rcu;
42         bool                    passthru;
43         int                     count;
44 };
45
46 static void macvlan_port_destroy(struct net_device *dev);
47
48 #define macvlan_port_get_rcu(dev) \
49         ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
50 #define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
51 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
52
53 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
54                                                const unsigned char *addr)
55 {
56         struct macvlan_dev *vlan;
57         struct hlist_node *n;
58
59         hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
60                 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
61                         return vlan;
62         }
63         return NULL;
64 }
65
66 static void macvlan_hash_add(struct macvlan_dev *vlan)
67 {
68         struct macvlan_port *port = vlan->port;
69         const unsigned char *addr = vlan->dev->dev_addr;
70
71         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
72 }
73
74 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
75 {
76         hlist_del_rcu(&vlan->hlist);
77         if (sync)
78                 synchronize_rcu();
79 }
80
81 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
82                                         const unsigned char *addr)
83 {
84         macvlan_hash_del(vlan, true);
85         /* Now that we are unhashed it is safe to change the device
86          * address without confusing packet delivery.
87          */
88         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
89         macvlan_hash_add(vlan);
90 }
91
92 static int macvlan_addr_busy(const struct macvlan_port *port,
93                                 const unsigned char *addr)
94 {
95         /* Test to see if the specified multicast address is
96          * currently in use by the underlying device or
97          * another macvlan.
98          */
99         if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
100                 return 1;
101
102         if (macvlan_hash_lookup(port, addr))
103                 return 1;
104
105         return 0;
106 }
107
108
109 static int macvlan_broadcast_one(struct sk_buff *skb,
110                                  const struct macvlan_dev *vlan,
111                                  const struct ethhdr *eth, bool local)
112 {
113         struct net_device *dev = vlan->dev;
114         if (!skb)
115                 return NET_RX_DROP;
116
117         if (local)
118                 return vlan->forward(dev, skb);
119
120         skb->dev = dev;
121         if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
122                 skb->pkt_type = PACKET_BROADCAST;
123         else
124                 skb->pkt_type = PACKET_MULTICAST;
125
126         return vlan->receive(skb);
127 }
128
129 static void macvlan_broadcast(struct sk_buff *skb,
130                               const struct macvlan_port *port,
131                               struct net_device *src,
132                               enum macvlan_mode mode)
133 {
134         const struct ethhdr *eth = eth_hdr(skb);
135         const struct macvlan_dev *vlan;
136         struct hlist_node *n;
137         struct sk_buff *nskb;
138         unsigned int i;
139         int err;
140
141         if (skb->protocol == htons(ETH_P_PAUSE))
142                 return;
143
144         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
145                 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
146                         if (vlan->dev == src || !(vlan->mode & mode))
147                                 continue;
148
149                         nskb = skb_clone(skb, GFP_ATOMIC);
150                         err = macvlan_broadcast_one(nskb, vlan, eth,
151                                          mode == MACVLAN_MODE_BRIDGE);
152                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
153                                          err == NET_RX_SUCCESS, 1);
154                 }
155         }
156 }
157
158 /* called under rcu_read_lock() from netif_receive_skb */
159 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
160 {
161         struct macvlan_port *port;
162         struct sk_buff *skb = *pskb;
163         const struct ethhdr *eth = eth_hdr(skb);
164         const struct macvlan_dev *vlan;
165         const struct macvlan_dev *src;
166         struct net_device *dev;
167         unsigned int len = 0;
168         int ret = NET_RX_DROP;
169
170         port = macvlan_port_get_rcu(skb->dev);
171         if (is_multicast_ether_addr(eth->h_dest)) {
172                 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
173                 if (!skb)
174                         return RX_HANDLER_CONSUMED;
175                 eth = eth_hdr(skb);
176                 src = macvlan_hash_lookup(port, eth->h_source);
177                 if (!src)
178                         /* frame comes from an external address */
179                         macvlan_broadcast(skb, port, NULL,
180                                           MACVLAN_MODE_PRIVATE |
181                                           MACVLAN_MODE_VEPA    |
182                                           MACVLAN_MODE_PASSTHRU|
183                                           MACVLAN_MODE_BRIDGE);
184                 else if (src->mode == MACVLAN_MODE_VEPA)
185                         /* flood to everyone except source */
186                         macvlan_broadcast(skb, port, src->dev,
187                                           MACVLAN_MODE_VEPA |
188                                           MACVLAN_MODE_BRIDGE);
189                 else if (src->mode == MACVLAN_MODE_BRIDGE)
190                         /*
191                          * flood only to VEPA ports, bridge ports
192                          * already saw the frame on the way out.
193                          */
194                         macvlan_broadcast(skb, port, src->dev,
195                                           MACVLAN_MODE_VEPA);
196                 else {
197                         /* forward to original port. */
198                         vlan = src;
199                         ret = macvlan_broadcast_one(skb, vlan, eth, 0);
200                         goto out;
201                 }
202
203                 return RX_HANDLER_PASS;
204         }
205
206         if (port->passthru)
207                 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
208         else
209                 vlan = macvlan_hash_lookup(port, eth->h_dest);
210         if (vlan == NULL)
211                 return RX_HANDLER_PASS;
212
213         dev = vlan->dev;
214         if (unlikely(!(dev->flags & IFF_UP))) {
215                 kfree_skb(skb);
216                 return RX_HANDLER_CONSUMED;
217         }
218         len = skb->len + ETH_HLEN;
219         skb = skb_share_check(skb, GFP_ATOMIC);
220         if (!skb)
221                 goto out;
222
223         skb->dev = dev;
224         skb->pkt_type = PACKET_HOST;
225
226         ret = vlan->receive(skb);
227
228 out:
229         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
230         return RX_HANDLER_CONSUMED;
231 }
232
233 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
234 {
235         const struct macvlan_dev *vlan = netdev_priv(dev);
236         const struct macvlan_port *port = vlan->port;
237         const struct macvlan_dev *dest;
238         __u8 ip_summed = skb->ip_summed;
239
240         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
241                 const struct ethhdr *eth = (void *)skb->data;
242                 skb->ip_summed = CHECKSUM_UNNECESSARY;
243
244                 /* send to other bridge ports directly */
245                 if (is_multicast_ether_addr(eth->h_dest)) {
246                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
247                         goto xmit_world;
248                 }
249
250                 dest = macvlan_hash_lookup(port, eth->h_dest);
251                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
252                         /* send to lowerdev first for its network taps */
253                         dev_forward_skb(vlan->lowerdev, skb);
254
255                         return NET_XMIT_SUCCESS;
256                 }
257         }
258
259 xmit_world:
260         skb->ip_summed = ip_summed;
261         skb->dev = vlan->lowerdev;
262         return dev_queue_xmit(skb);
263 }
264
265 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
266                                struct net_device *dev)
267 {
268         unsigned int len = skb->len;
269         int ret;
270         const struct macvlan_dev *vlan = netdev_priv(dev);
271
272         ret = macvlan_queue_xmit(skb, dev);
273         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
274                 struct macvlan_pcpu_stats *pcpu_stats;
275
276                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
277                 u64_stats_update_begin(&pcpu_stats->syncp);
278                 pcpu_stats->tx_packets++;
279                 pcpu_stats->tx_bytes += len;
280                 u64_stats_update_end(&pcpu_stats->syncp);
281         } else {
282                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
283         }
284         return ret;
285 }
286 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
287
288 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
289                                unsigned short type, const void *daddr,
290                                const void *saddr, unsigned len)
291 {
292         const struct macvlan_dev *vlan = netdev_priv(dev);
293         struct net_device *lowerdev = vlan->lowerdev;
294
295         return dev_hard_header(skb, lowerdev, type, daddr,
296                                saddr ? : dev->dev_addr, len);
297 }
298
299 static const struct header_ops macvlan_hard_header_ops = {
300         .create         = macvlan_hard_header,
301         .rebuild        = eth_rebuild_header,
302         .parse          = eth_header_parse,
303         .cache          = eth_header_cache,
304         .cache_update   = eth_header_cache_update,
305 };
306
307 static int macvlan_open(struct net_device *dev)
308 {
309         struct macvlan_dev *vlan = netdev_priv(dev);
310         struct net_device *lowerdev = vlan->lowerdev;
311         int err;
312
313         if (vlan->port->passthru) {
314                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
315                         dev_set_promiscuity(lowerdev, 1);
316                 goto hash_add;
317         }
318
319         err = -EBUSY;
320         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
321                 goto out;
322
323         err = dev_uc_add(lowerdev, dev->dev_addr);
324         if (err < 0)
325                 goto out;
326         if (dev->flags & IFF_ALLMULTI) {
327                 err = dev_set_allmulti(lowerdev, 1);
328                 if (err < 0)
329                         goto del_unicast;
330         }
331
332 hash_add:
333         macvlan_hash_add(vlan);
334         return 0;
335
336 del_unicast:
337         dev_uc_del(lowerdev, dev->dev_addr);
338 out:
339         return err;
340 }
341
342 static int macvlan_stop(struct net_device *dev)
343 {
344         struct macvlan_dev *vlan = netdev_priv(dev);
345         struct net_device *lowerdev = vlan->lowerdev;
346
347         dev_uc_unsync(lowerdev, dev);
348         dev_mc_unsync(lowerdev, dev);
349
350         if (vlan->port->passthru) {
351                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
352                         dev_set_promiscuity(lowerdev, -1);
353                 goto hash_del;
354         }
355
356         if (dev->flags & IFF_ALLMULTI)
357                 dev_set_allmulti(lowerdev, -1);
358
359         dev_uc_del(lowerdev, dev->dev_addr);
360
361 hash_del:
362         macvlan_hash_del(vlan, !dev->dismantle);
363         return 0;
364 }
365
366 static int macvlan_set_mac_address(struct net_device *dev, void *p)
367 {
368         struct macvlan_dev *vlan = netdev_priv(dev);
369         struct net_device *lowerdev = vlan->lowerdev;
370         struct sockaddr *addr = p;
371         int err;
372
373         if (!is_valid_ether_addr(addr->sa_data))
374                 return -EADDRNOTAVAIL;
375
376         if (!(dev->flags & IFF_UP)) {
377                 /* Just copy in the new address */
378                 dev->addr_assign_type &= ~NET_ADDR_RANDOM;
379                 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
380         } else {
381                 /* Rehash and update the device filters */
382                 if (macvlan_addr_busy(vlan->port, addr->sa_data))
383                         return -EBUSY;
384
385                 err = dev_uc_add(lowerdev, addr->sa_data);
386                 if (err)
387                         return err;
388
389                 dev_uc_del(lowerdev, dev->dev_addr);
390
391                 macvlan_hash_change_addr(vlan, addr->sa_data);
392         }
393         return 0;
394 }
395
396 static void macvlan_change_rx_flags(struct net_device *dev, int change)
397 {
398         struct macvlan_dev *vlan = netdev_priv(dev);
399         struct net_device *lowerdev = vlan->lowerdev;
400
401         if (change & IFF_ALLMULTI)
402                 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
403 }
404
405 static void macvlan_set_mac_lists(struct net_device *dev)
406 {
407         struct macvlan_dev *vlan = netdev_priv(dev);
408
409         dev_uc_sync(vlan->lowerdev, dev);
410         dev_mc_sync(vlan->lowerdev, dev);
411 }
412
413 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
414 {
415         struct macvlan_dev *vlan = netdev_priv(dev);
416
417         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
418                 return -EINVAL;
419         dev->mtu = new_mtu;
420         return 0;
421 }
422
423 /*
424  * macvlan network devices have devices nesting below it and are a special
425  * "super class" of normal network devices; split their locks off into a
426  * separate class since they always nest.
427  */
428 static struct lock_class_key macvlan_netdev_xmit_lock_key;
429 static struct lock_class_key macvlan_netdev_addr_lock_key;
430
431 #define MACVLAN_FEATURES \
432         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
433          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
434          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
435          NETIF_F_HW_VLAN_FILTER)
436
437 #define MACVLAN_STATE_MASK \
438         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
439
440 static void macvlan_set_lockdep_class_one(struct net_device *dev,
441                                           struct netdev_queue *txq,
442                                           void *_unused)
443 {
444         lockdep_set_class(&txq->_xmit_lock,
445                           &macvlan_netdev_xmit_lock_key);
446 }
447
448 static void macvlan_set_lockdep_class(struct net_device *dev)
449 {
450         lockdep_set_class(&dev->addr_list_lock,
451                           &macvlan_netdev_addr_lock_key);
452         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
453 }
454
455 static int macvlan_init(struct net_device *dev)
456 {
457         struct macvlan_dev *vlan = netdev_priv(dev);
458         const struct net_device *lowerdev = vlan->lowerdev;
459
460         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
461                                   (lowerdev->state & MACVLAN_STATE_MASK);
462         dev->features           = lowerdev->features & MACVLAN_FEATURES;
463         dev->features           |= NETIF_F_LLTX;
464         dev->gso_max_size       = lowerdev->gso_max_size;
465         dev->iflink             = lowerdev->ifindex;
466         dev->hard_header_len    = lowerdev->hard_header_len;
467
468         macvlan_set_lockdep_class(dev);
469
470         vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
471         if (!vlan->pcpu_stats)
472                 return -ENOMEM;
473
474         return 0;
475 }
476
477 static void macvlan_uninit(struct net_device *dev)
478 {
479         struct macvlan_dev *vlan = netdev_priv(dev);
480         struct macvlan_port *port = vlan->port;
481
482         free_percpu(vlan->pcpu_stats);
483
484         port->count -= 1;
485         if (!port->count)
486                 macvlan_port_destroy(port->dev);
487 }
488
489 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
490                                                          struct rtnl_link_stats64 *stats)
491 {
492         struct macvlan_dev *vlan = netdev_priv(dev);
493
494         if (vlan->pcpu_stats) {
495                 struct macvlan_pcpu_stats *p;
496                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
497                 u32 rx_errors = 0, tx_dropped = 0;
498                 unsigned int start;
499                 int i;
500
501                 for_each_possible_cpu(i) {
502                         p = per_cpu_ptr(vlan->pcpu_stats, i);
503                         do {
504                                 start = u64_stats_fetch_begin_bh(&p->syncp);
505                                 rx_packets      = p->rx_packets;
506                                 rx_bytes        = p->rx_bytes;
507                                 rx_multicast    = p->rx_multicast;
508                                 tx_packets      = p->tx_packets;
509                                 tx_bytes        = p->tx_bytes;
510                         } while (u64_stats_fetch_retry_bh(&p->syncp, start));
511
512                         stats->rx_packets       += rx_packets;
513                         stats->rx_bytes         += rx_bytes;
514                         stats->multicast        += rx_multicast;
515                         stats->tx_packets       += tx_packets;
516                         stats->tx_bytes         += tx_bytes;
517                         /* rx_errors & tx_dropped are u32, updated
518                          * without syncp protection.
519                          */
520                         rx_errors       += p->rx_errors;
521                         tx_dropped      += p->tx_dropped;
522                 }
523                 stats->rx_errors        = rx_errors;
524                 stats->rx_dropped       = rx_errors;
525                 stats->tx_dropped       = tx_dropped;
526         }
527         return stats;
528 }
529
530 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
531                                     unsigned short vid)
532 {
533         struct macvlan_dev *vlan = netdev_priv(dev);
534         struct net_device *lowerdev = vlan->lowerdev;
535
536         return vlan_vid_add(lowerdev, vid);
537 }
538
539 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
540                                      unsigned short vid)
541 {
542         struct macvlan_dev *vlan = netdev_priv(dev);
543         struct net_device *lowerdev = vlan->lowerdev;
544
545         vlan_vid_del(lowerdev, vid);
546         return 0;
547 }
548
549 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
550                            struct net_device *dev,
551                            const unsigned char *addr,
552                            u16 flags)
553 {
554         struct macvlan_dev *vlan = netdev_priv(dev);
555         int err = -EINVAL;
556
557         if (!vlan->port->passthru)
558                 return -EOPNOTSUPP;
559
560         if (is_unicast_ether_addr(addr))
561                 err = dev_uc_add_excl(dev, addr);
562         else if (is_multicast_ether_addr(addr))
563                 err = dev_mc_add_excl(dev, addr);
564
565         return err;
566 }
567
568 static int macvlan_fdb_del(struct ndmsg *ndm,
569                            struct net_device *dev,
570                            const unsigned char *addr)
571 {
572         struct macvlan_dev *vlan = netdev_priv(dev);
573         int err = -EINVAL;
574
575         if (!vlan->port->passthru)
576                 return -EOPNOTSUPP;
577
578         if (is_unicast_ether_addr(addr))
579                 err = dev_uc_del(dev, addr);
580         else if (is_multicast_ether_addr(addr))
581                 err = dev_mc_del(dev, addr);
582
583         return err;
584 }
585
586 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
587                                         struct ethtool_drvinfo *drvinfo)
588 {
589         snprintf(drvinfo->driver, 32, "macvlan");
590         snprintf(drvinfo->version, 32, "0.1");
591 }
592
593 static int macvlan_ethtool_get_settings(struct net_device *dev,
594                                         struct ethtool_cmd *cmd)
595 {
596         const struct macvlan_dev *vlan = netdev_priv(dev);
597
598         return __ethtool_get_settings(vlan->lowerdev, cmd);
599 }
600
601 static const struct ethtool_ops macvlan_ethtool_ops = {
602         .get_link               = ethtool_op_get_link,
603         .get_settings           = macvlan_ethtool_get_settings,
604         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
605 };
606
607 static const struct net_device_ops macvlan_netdev_ops = {
608         .ndo_init               = macvlan_init,
609         .ndo_uninit             = macvlan_uninit,
610         .ndo_open               = macvlan_open,
611         .ndo_stop               = macvlan_stop,
612         .ndo_start_xmit         = macvlan_start_xmit,
613         .ndo_change_mtu         = macvlan_change_mtu,
614         .ndo_change_rx_flags    = macvlan_change_rx_flags,
615         .ndo_set_mac_address    = macvlan_set_mac_address,
616         .ndo_set_rx_mode        = macvlan_set_mac_lists,
617         .ndo_get_stats64        = macvlan_dev_get_stats64,
618         .ndo_validate_addr      = eth_validate_addr,
619         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
620         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
621         .ndo_fdb_add            = macvlan_fdb_add,
622         .ndo_fdb_del            = macvlan_fdb_del,
623         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
624 };
625
626 void macvlan_common_setup(struct net_device *dev)
627 {
628         ether_setup(dev);
629
630         dev->priv_flags        &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
631         dev->netdev_ops         = &macvlan_netdev_ops;
632         dev->destructor         = free_netdev;
633         dev->header_ops         = &macvlan_hard_header_ops,
634         dev->ethtool_ops        = &macvlan_ethtool_ops;
635 }
636 EXPORT_SYMBOL_GPL(macvlan_common_setup);
637
638 static void macvlan_setup(struct net_device *dev)
639 {
640         macvlan_common_setup(dev);
641         dev->tx_queue_len       = 0;
642 }
643
644 static int macvlan_port_create(struct net_device *dev)
645 {
646         struct macvlan_port *port;
647         unsigned int i;
648         int err;
649
650         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
651                 return -EINVAL;
652
653         port = kzalloc(sizeof(*port), GFP_KERNEL);
654         if (port == NULL)
655                 return -ENOMEM;
656
657         port->passthru = false;
658         port->dev = dev;
659         INIT_LIST_HEAD(&port->vlans);
660         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
661                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
662
663         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
664         if (err)
665                 kfree(port);
666         else
667                 dev->priv_flags |= IFF_MACVLAN_PORT;
668         return err;
669 }
670
671 static void macvlan_port_destroy(struct net_device *dev)
672 {
673         struct macvlan_port *port = macvlan_port_get(dev);
674
675         dev->priv_flags &= ~IFF_MACVLAN_PORT;
676         netdev_rx_handler_unregister(dev);
677         kfree_rcu(port, rcu);
678 }
679
680 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
681 {
682         if (tb[IFLA_ADDRESS]) {
683                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
684                         return -EINVAL;
685                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
686                         return -EADDRNOTAVAIL;
687         }
688
689         if (data && data[IFLA_MACVLAN_MODE]) {
690                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
691                 case MACVLAN_MODE_PRIVATE:
692                 case MACVLAN_MODE_VEPA:
693                 case MACVLAN_MODE_BRIDGE:
694                 case MACVLAN_MODE_PASSTHRU:
695                         break;
696                 default:
697                         return -EINVAL;
698                 }
699         }
700         return 0;
701 }
702
703 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
704                            struct nlattr *tb[], struct nlattr *data[],
705                            int (*receive)(struct sk_buff *skb),
706                            int (*forward)(struct net_device *dev,
707                                           struct sk_buff *skb))
708 {
709         struct macvlan_dev *vlan = netdev_priv(dev);
710         struct macvlan_port *port;
711         struct net_device *lowerdev;
712         int err;
713
714         if (!tb[IFLA_LINK])
715                 return -EINVAL;
716
717         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
718         if (lowerdev == NULL)
719                 return -ENODEV;
720
721         /* When creating macvlans on top of other macvlans - use
722          * the real device as the lowerdev.
723          */
724         if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
725                 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
726                 lowerdev = lowervlan->lowerdev;
727         }
728
729         if (!tb[IFLA_MTU])
730                 dev->mtu = lowerdev->mtu;
731         else if (dev->mtu > lowerdev->mtu)
732                 return -EINVAL;
733
734         if (!tb[IFLA_ADDRESS])
735                 eth_hw_addr_random(dev);
736
737         if (!macvlan_port_exists(lowerdev)) {
738                 err = macvlan_port_create(lowerdev);
739                 if (err < 0)
740                         return err;
741         }
742         port = macvlan_port_get(lowerdev);
743
744         /* Only 1 macvlan device can be created in passthru mode */
745         if (port->passthru)
746                 return -EINVAL;
747
748         vlan->lowerdev = lowerdev;
749         vlan->dev      = dev;
750         vlan->port     = port;
751         vlan->receive  = receive;
752         vlan->forward  = forward;
753
754         vlan->mode     = MACVLAN_MODE_VEPA;
755         if (data && data[IFLA_MACVLAN_MODE])
756                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
757
758         if (data && data[IFLA_MACVLAN_FLAGS])
759                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
760
761         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
762                 if (port->count)
763                         return -EINVAL;
764                 port->passthru = true;
765                 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
766         }
767
768         port->count += 1;
769         err = register_netdevice(dev);
770         if (err < 0)
771                 goto destroy_port;
772
773         list_add_tail(&vlan->list, &port->vlans);
774         netif_stacked_transfer_operstate(lowerdev, dev);
775
776         return 0;
777
778 destroy_port:
779         port->count -= 1;
780         if (!port->count)
781                 macvlan_port_destroy(lowerdev);
782
783         return err;
784 }
785 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
786
787 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
788                            struct nlattr *tb[], struct nlattr *data[])
789 {
790         return macvlan_common_newlink(src_net, dev, tb, data,
791                                       netif_rx,
792                                       dev_forward_skb);
793 }
794
795 void macvlan_dellink(struct net_device *dev, struct list_head *head)
796 {
797         struct macvlan_dev *vlan = netdev_priv(dev);
798
799         list_del(&vlan->list);
800         unregister_netdevice_queue(dev, head);
801 }
802 EXPORT_SYMBOL_GPL(macvlan_dellink);
803
804 static int macvlan_changelink(struct net_device *dev,
805                 struct nlattr *tb[], struct nlattr *data[])
806 {
807         struct macvlan_dev *vlan = netdev_priv(dev);
808         if (data && data[IFLA_MACVLAN_MODE])
809                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
810         if (data && data[IFLA_MACVLAN_FLAGS]) {
811                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
812                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
813
814                 if (promisc && (flags & MACVLAN_FLAG_NOPROMISC))
815                         dev_set_promiscuity(vlan->lowerdev, -1);
816                 else if (promisc && !(flags & MACVLAN_FLAG_NOPROMISC))
817                         dev_set_promiscuity(vlan->lowerdev, 1);
818                 vlan->flags = flags;
819         }
820         return 0;
821 }
822
823 static size_t macvlan_get_size(const struct net_device *dev)
824 {
825         return (0
826                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
827                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
828                 );
829 }
830
831 static int macvlan_fill_info(struct sk_buff *skb,
832                                 const struct net_device *dev)
833 {
834         struct macvlan_dev *vlan = netdev_priv(dev);
835
836         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
837                 goto nla_put_failure;
838         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
839                 goto nla_put_failure;
840         return 0;
841
842 nla_put_failure:
843         return -EMSGSIZE;
844 }
845
846 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
847         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
848         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
849 };
850
851 int macvlan_link_register(struct rtnl_link_ops *ops)
852 {
853         /* common fields */
854         ops->priv_size          = sizeof(struct macvlan_dev);
855         ops->validate           = macvlan_validate;
856         ops->maxtype            = IFLA_MACVLAN_MAX;
857         ops->policy             = macvlan_policy;
858         ops->changelink         = macvlan_changelink;
859         ops->get_size           = macvlan_get_size;
860         ops->fill_info          = macvlan_fill_info;
861
862         return rtnl_link_register(ops);
863 };
864 EXPORT_SYMBOL_GPL(macvlan_link_register);
865
866 static struct rtnl_link_ops macvlan_link_ops = {
867         .kind           = "macvlan",
868         .setup          = macvlan_setup,
869         .newlink        = macvlan_newlink,
870         .dellink        = macvlan_dellink,
871 };
872
873 static int macvlan_device_event(struct notifier_block *unused,
874                                 unsigned long event, void *ptr)
875 {
876         struct net_device *dev = ptr;
877         struct macvlan_dev *vlan, *next;
878         struct macvlan_port *port;
879         LIST_HEAD(list_kill);
880
881         if (!macvlan_port_exists(dev))
882                 return NOTIFY_DONE;
883
884         port = macvlan_port_get(dev);
885
886         switch (event) {
887         case NETDEV_CHANGE:
888                 list_for_each_entry(vlan, &port->vlans, list)
889                         netif_stacked_transfer_operstate(vlan->lowerdev,
890                                                          vlan->dev);
891                 break;
892         case NETDEV_FEAT_CHANGE:
893                 list_for_each_entry(vlan, &port->vlans, list) {
894                         vlan->dev->features = dev->features & MACVLAN_FEATURES;
895                         vlan->dev->gso_max_size = dev->gso_max_size;
896                         netdev_features_change(vlan->dev);
897                 }
898                 break;
899         case NETDEV_UNREGISTER:
900                 /* twiddle thumbs on netns device moves */
901                 if (dev->reg_state != NETREG_UNREGISTERING)
902                         break;
903
904                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
905                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
906                 unregister_netdevice_many(&list_kill);
907                 list_del(&list_kill);
908                 break;
909         case NETDEV_PRE_TYPE_CHANGE:
910                 /* Forbid underlaying device to change its type. */
911                 return NOTIFY_BAD;
912         }
913         return NOTIFY_DONE;
914 }
915
916 static struct notifier_block macvlan_notifier_block __read_mostly = {
917         .notifier_call  = macvlan_device_event,
918 };
919
920 static int __init macvlan_init_module(void)
921 {
922         int err;
923
924         register_netdevice_notifier(&macvlan_notifier_block);
925
926         err = macvlan_link_register(&macvlan_link_ops);
927         if (err < 0)
928                 goto err1;
929         return 0;
930 err1:
931         unregister_netdevice_notifier(&macvlan_notifier_block);
932         return err;
933 }
934
935 static void __exit macvlan_cleanup_module(void)
936 {
937         rtnl_link_unregister(&macvlan_link_ops);
938         unregister_netdevice_notifier(&macvlan_notifier_block);
939 }
940
941 module_init(macvlan_init_module);
942 module_exit(macvlan_cleanup_module);
943
944 MODULE_LICENSE("GPL");
945 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
946 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
947 MODULE_ALIAS_RTNL_LINK("macvlan");