Version:  2.0.40 2.2.26 2.4.37 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 3.16 3.17

Linux/drivers/net/macvlan.c

  1 /*
  2  * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
  3  *
  4  * This program is free software; you can redistribute it and/or
  5  * modify it under the terms of the GNU General Public License as
  6  * published by the Free Software Foundation; either version 2 of
  7  * the License, or (at your option) any later version.
  8  *
  9  * The code this is based on carried the following copyright notice:
 10  * ---
 11  * (C) Copyright 2001-2006
 12  * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
 13  * Re-worked by Ben Greear <greearb@candelatech.com>
 14  * ---
 15  */
 16 #include <linux/kernel.h>
 17 #include <linux/types.h>
 18 #include <linux/module.h>
 19 #include <linux/init.h>
 20 #include <linux/errno.h>
 21 #include <linux/slab.h>
 22 #include <linux/string.h>
 23 #include <linux/rculist.h>
 24 #include <linux/notifier.h>
 25 #include <linux/netdevice.h>
 26 #include <linux/etherdevice.h>
 27 #include <linux/ethtool.h>
 28 #include <linux/if_arp.h>
 29 #include <linux/if_vlan.h>
 30 #include <linux/if_link.h>
 31 #include <linux/if_macvlan.h>
 32 #include <linux/hash.h>
 33 #include <linux/workqueue.h>
 34 #include <net/rtnetlink.h>
 35 #include <net/xfrm.h>
 36 #include <linux/netpoll.h>
 37 
 38 #define MACVLAN_HASH_SIZE       (1 << BITS_PER_BYTE)
 39 #define MACVLAN_BC_QUEUE_LEN    1000
 40 
 41 struct macvlan_port {
 42         struct net_device       *dev;
 43         struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
 44         struct list_head        vlans;
 45         struct rcu_head         rcu;
 46         struct sk_buff_head     bc_queue;
 47         struct work_struct      bc_work;
 48         bool                    passthru;
 49         int                     count;
 50 };
 51 
 52 struct macvlan_skb_cb {
 53         const struct macvlan_dev *src;
 54 };
 55 
 56 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
 57 
 58 static void macvlan_port_destroy(struct net_device *dev);
 59 
 60 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
 61 {
 62         return rcu_dereference(dev->rx_handler_data);
 63 }
 64 
 65 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
 66 {
 67         return rtnl_dereference(dev->rx_handler_data);
 68 }
 69 
 70 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
 71 
 72 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
 73                                                const unsigned char *addr)
 74 {
 75         struct macvlan_dev *vlan;
 76 
 77         hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) {
 78                 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
 79                         return vlan;
 80         }
 81         return NULL;
 82 }
 83 
 84 static void macvlan_hash_add(struct macvlan_dev *vlan)
 85 {
 86         struct macvlan_port *port = vlan->port;
 87         const unsigned char *addr = vlan->dev->dev_addr;
 88 
 89         hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
 90 }
 91 
 92 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
 93 {
 94         hlist_del_rcu(&vlan->hlist);
 95         if (sync)
 96                 synchronize_rcu();
 97 }
 98 
 99 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
100                                         const unsigned char *addr)
101 {
102         macvlan_hash_del(vlan, true);
103         /* Now that we are unhashed it is safe to change the device
104          * address without confusing packet delivery.
105          */
106         memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
107         macvlan_hash_add(vlan);
108 }
109 
110 static int macvlan_addr_busy(const struct macvlan_port *port,
111                                 const unsigned char *addr)
112 {
113         /* Test to see if the specified multicast address is
114          * currently in use by the underlying device or
115          * another macvlan.
116          */
117         if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
118                 return 1;
119 
120         if (macvlan_hash_lookup(port, addr))
121                 return 1;
122 
123         return 0;
124 }
125 
126 
127 static int macvlan_broadcast_one(struct sk_buff *skb,
128                                  const struct macvlan_dev *vlan,
129                                  const struct ethhdr *eth, bool local)
130 {
131         struct net_device *dev = vlan->dev;
132 
133         if (local)
134                 return __dev_forward_skb(dev, skb);
135 
136         skb->dev = dev;
137         if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
138                 skb->pkt_type = PACKET_BROADCAST;
139         else
140                 skb->pkt_type = PACKET_MULTICAST;
141 
142         return 0;
143 }
144 
145 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
146 {
147         return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
148 }
149 
150 
151 static unsigned int mc_hash(const struct macvlan_dev *vlan,
152                             const unsigned char *addr)
153 {
154         u32 val = __get_unaligned_cpu32(addr + 2);
155 
156         val ^= macvlan_hash_mix(vlan);
157         return hash_32(val, MACVLAN_MC_FILTER_BITS);
158 }
159 
160 static void macvlan_broadcast(struct sk_buff *skb,
161                               const struct macvlan_port *port,
162                               struct net_device *src,
163                               enum macvlan_mode mode)
164 {
165         const struct ethhdr *eth = eth_hdr(skb);
166         const struct macvlan_dev *vlan;
167         struct sk_buff *nskb;
168         unsigned int i;
169         int err;
170         unsigned int hash;
171 
172         if (skb->protocol == htons(ETH_P_PAUSE))
173                 return;
174 
175         for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
176                 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
177                         if (vlan->dev == src || !(vlan->mode & mode))
178                                 continue;
179 
180                         hash = mc_hash(vlan, eth->h_dest);
181                         if (!test_bit(hash, vlan->mc_filter))
182                                 continue;
183 
184                         err = NET_RX_DROP;
185                         nskb = skb_clone(skb, GFP_ATOMIC);
186                         if (likely(nskb))
187                                 err = macvlan_broadcast_one(
188                                         nskb, vlan, eth,
189                                         mode == MACVLAN_MODE_BRIDGE) ?:
190                                       netif_rx_ni(nskb);
191                         macvlan_count_rx(vlan, skb->len + ETH_HLEN,
192                                          err == NET_RX_SUCCESS, 1);
193                 }
194         }
195 }
196 
197 static void macvlan_process_broadcast(struct work_struct *w)
198 {
199         struct macvlan_port *port = container_of(w, struct macvlan_port,
200                                                  bc_work);
201         struct sk_buff *skb;
202         struct sk_buff_head list;
203 
204         skb_queue_head_init(&list);
205 
206         spin_lock_bh(&port->bc_queue.lock);
207         skb_queue_splice_tail_init(&port->bc_queue, &list);
208         spin_unlock_bh(&port->bc_queue.lock);
209 
210         while ((skb = __skb_dequeue(&list))) {
211                 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
212 
213                 rcu_read_lock();
214 
215                 if (!src)
216                         /* frame comes from an external address */
217                         macvlan_broadcast(skb, port, NULL,
218                                           MACVLAN_MODE_PRIVATE |
219                                           MACVLAN_MODE_VEPA    |
220                                           MACVLAN_MODE_PASSTHRU|
221                                           MACVLAN_MODE_BRIDGE);
222                 else if (src->mode == MACVLAN_MODE_VEPA)
223                         /* flood to everyone except source */
224                         macvlan_broadcast(skb, port, src->dev,
225                                           MACVLAN_MODE_VEPA |
226                                           MACVLAN_MODE_BRIDGE);
227                 else
228                         /*
229                          * flood only to VEPA ports, bridge ports
230                          * already saw the frame on the way out.
231                          */
232                         macvlan_broadcast(skb, port, src->dev,
233                                           MACVLAN_MODE_VEPA);
234 
235                 rcu_read_unlock();
236 
237                 kfree_skb(skb);
238         }
239 }
240 
241 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
242                                       struct sk_buff *skb)
243 {
244         struct sk_buff *nskb;
245         int err = -ENOMEM;
246 
247         nskb = skb_clone(skb, GFP_ATOMIC);
248         if (!nskb)
249                 goto err;
250 
251         spin_lock(&port->bc_queue.lock);
252         if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
253                 __skb_queue_tail(&port->bc_queue, nskb);
254                 err = 0;
255         }
256         spin_unlock(&port->bc_queue.lock);
257 
258         if (err)
259                 goto free_nskb;
260 
261         schedule_work(&port->bc_work);
262         return;
263 
264 free_nskb:
265         kfree_skb(nskb);
266 err:
267         atomic_long_inc(&skb->dev->rx_dropped);
268 }
269 
270 /* called under rcu_read_lock() from netif_receive_skb */
271 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
272 {
273         struct macvlan_port *port;
274         struct sk_buff *skb = *pskb;
275         const struct ethhdr *eth = eth_hdr(skb);
276         const struct macvlan_dev *vlan;
277         const struct macvlan_dev *src;
278         struct net_device *dev;
279         unsigned int len = 0;
280         int ret = NET_RX_DROP;
281 
282         port = macvlan_port_get_rcu(skb->dev);
283         if (is_multicast_ether_addr(eth->h_dest)) {
284                 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
285                 if (!skb)
286                         return RX_HANDLER_CONSUMED;
287                 eth = eth_hdr(skb);
288                 src = macvlan_hash_lookup(port, eth->h_source);
289                 if (src && src->mode != MACVLAN_MODE_VEPA &&
290                     src->mode != MACVLAN_MODE_BRIDGE) {
291                         /* forward to original port. */
292                         vlan = src;
293                         ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
294                               netif_rx(skb);
295                         goto out;
296                 }
297 
298                 MACVLAN_SKB_CB(skb)->src = src;
299                 macvlan_broadcast_enqueue(port, skb);
300 
301                 return RX_HANDLER_PASS;
302         }
303 
304         if (port->passthru)
305                 vlan = list_first_or_null_rcu(&port->vlans,
306                                               struct macvlan_dev, list);
307         else
308                 vlan = macvlan_hash_lookup(port, eth->h_dest);
309         if (vlan == NULL)
310                 return RX_HANDLER_PASS;
311 
312         dev = vlan->dev;
313         if (unlikely(!(dev->flags & IFF_UP))) {
314                 kfree_skb(skb);
315                 return RX_HANDLER_CONSUMED;
316         }
317         len = skb->len + ETH_HLEN;
318         skb = skb_share_check(skb, GFP_ATOMIC);
319         if (!skb)
320                 goto out;
321 
322         skb->dev = dev;
323         skb->pkt_type = PACKET_HOST;
324 
325         ret = netif_rx(skb);
326 
327 out:
328         macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
329         return RX_HANDLER_CONSUMED;
330 }
331 
332 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
333 {
334         const struct macvlan_dev *vlan = netdev_priv(dev);
335         const struct macvlan_port *port = vlan->port;
336         const struct macvlan_dev *dest;
337 
338         if (vlan->mode == MACVLAN_MODE_BRIDGE) {
339                 const struct ethhdr *eth = (void *)skb->data;
340 
341                 /* send to other bridge ports directly */
342                 if (is_multicast_ether_addr(eth->h_dest)) {
343                         macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
344                         goto xmit_world;
345                 }
346 
347                 dest = macvlan_hash_lookup(port, eth->h_dest);
348                 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
349                         /* send to lowerdev first for its network taps */
350                         dev_forward_skb(vlan->lowerdev, skb);
351 
352                         return NET_XMIT_SUCCESS;
353                 }
354         }
355 
356 xmit_world:
357         skb->dev = vlan->lowerdev;
358         return dev_queue_xmit(skb);
359 }
360 
361 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
362 {
363 #ifdef CONFIG_NET_POLL_CONTROLLER
364         if (vlan->netpoll)
365                 netpoll_send_skb(vlan->netpoll, skb);
366 #else
367         BUG();
368 #endif
369         return NETDEV_TX_OK;
370 }
371 
372 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
373                                       struct net_device *dev)
374 {
375         unsigned int len = skb->len;
376         int ret;
377         struct macvlan_dev *vlan = netdev_priv(dev);
378 
379         if (unlikely(netpoll_tx_running(dev)))
380                 return macvlan_netpoll_send_skb(vlan, skb);
381 
382         if (vlan->fwd_priv) {
383                 skb->dev = vlan->lowerdev;
384                 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
385         } else {
386                 ret = macvlan_queue_xmit(skb, dev);
387         }
388 
389         if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
390                 struct vlan_pcpu_stats *pcpu_stats;
391 
392                 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
393                 u64_stats_update_begin(&pcpu_stats->syncp);
394                 pcpu_stats->tx_packets++;
395                 pcpu_stats->tx_bytes += len;
396                 u64_stats_update_end(&pcpu_stats->syncp);
397         } else {
398                 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
399         }
400         return ret;
401 }
402 
403 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
404                                unsigned short type, const void *daddr,
405                                const void *saddr, unsigned len)
406 {
407         const struct macvlan_dev *vlan = netdev_priv(dev);
408         struct net_device *lowerdev = vlan->lowerdev;
409 
410         return dev_hard_header(skb, lowerdev, type, daddr,
411                                saddr ? : dev->dev_addr, len);
412 }
413 
414 static const struct header_ops macvlan_hard_header_ops = {
415         .create         = macvlan_hard_header,
416         .rebuild        = eth_rebuild_header,
417         .parse          = eth_header_parse,
418         .cache          = eth_header_cache,
419         .cache_update   = eth_header_cache_update,
420 };
421 
422 static struct rtnl_link_ops macvlan_link_ops;
423 
424 static int macvlan_open(struct net_device *dev)
425 {
426         struct macvlan_dev *vlan = netdev_priv(dev);
427         struct net_device *lowerdev = vlan->lowerdev;
428         int err;
429 
430         if (vlan->port->passthru) {
431                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
432                         err = dev_set_promiscuity(lowerdev, 1);
433                         if (err < 0)
434                                 goto out;
435                 }
436                 goto hash_add;
437         }
438 
439         if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
440             dev->rtnl_link_ops == &macvlan_link_ops) {
441                 vlan->fwd_priv =
442                       lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
443 
444                 /* If we get a NULL pointer back, or if we get an error
445                  * then we should just fall through to the non accelerated path
446                  */
447                 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
448                         vlan->fwd_priv = NULL;
449                 } else
450                         return 0;
451         }
452 
453         err = -EBUSY;
454         if (macvlan_addr_busy(vlan->port, dev->dev_addr))
455                 goto out;
456 
457         err = dev_uc_add(lowerdev, dev->dev_addr);
458         if (err < 0)
459                 goto out;
460         if (dev->flags & IFF_ALLMULTI) {
461                 err = dev_set_allmulti(lowerdev, 1);
462                 if (err < 0)
463                         goto del_unicast;
464         }
465 
466 hash_add:
467         macvlan_hash_add(vlan);
468         return 0;
469 
470 del_unicast:
471         dev_uc_del(lowerdev, dev->dev_addr);
472 out:
473         if (vlan->fwd_priv) {
474                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
475                                                            vlan->fwd_priv);
476                 vlan->fwd_priv = NULL;
477         }
478         return err;
479 }
480 
481 static int macvlan_stop(struct net_device *dev)
482 {
483         struct macvlan_dev *vlan = netdev_priv(dev);
484         struct net_device *lowerdev = vlan->lowerdev;
485 
486         if (vlan->fwd_priv) {
487                 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
488                                                            vlan->fwd_priv);
489                 vlan->fwd_priv = NULL;
490                 return 0;
491         }
492 
493         dev_uc_unsync(lowerdev, dev);
494         dev_mc_unsync(lowerdev, dev);
495 
496         if (vlan->port->passthru) {
497                 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
498                         dev_set_promiscuity(lowerdev, -1);
499                 goto hash_del;
500         }
501 
502         if (dev->flags & IFF_ALLMULTI)
503                 dev_set_allmulti(lowerdev, -1);
504 
505         dev_uc_del(lowerdev, dev->dev_addr);
506 
507 hash_del:
508         macvlan_hash_del(vlan, !dev->dismantle);
509         return 0;
510 }
511 
512 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
513 {
514         struct macvlan_dev *vlan = netdev_priv(dev);
515         struct net_device *lowerdev = vlan->lowerdev;
516         int err;
517 
518         if (!(dev->flags & IFF_UP)) {
519                 /* Just copy in the new address */
520                 ether_addr_copy(dev->dev_addr, addr);
521         } else {
522                 /* Rehash and update the device filters */
523                 if (macvlan_addr_busy(vlan->port, addr))
524                         return -EBUSY;
525 
526                 if (!vlan->port->passthru) {
527                         err = dev_uc_add(lowerdev, addr);
528                         if (err)
529                                 return err;
530 
531                         dev_uc_del(lowerdev, dev->dev_addr);
532                 }
533 
534                 macvlan_hash_change_addr(vlan, addr);
535         }
536         return 0;
537 }
538 
539 static int macvlan_set_mac_address(struct net_device *dev, void *p)
540 {
541         struct macvlan_dev *vlan = netdev_priv(dev);
542         struct sockaddr *addr = p;
543 
544         if (!is_valid_ether_addr(addr->sa_data))
545                 return -EADDRNOTAVAIL;
546 
547         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
548                 dev_set_mac_address(vlan->lowerdev, addr);
549                 return 0;
550         }
551 
552         return macvlan_sync_address(dev, addr->sa_data);
553 }
554 
555 static void macvlan_change_rx_flags(struct net_device *dev, int change)
556 {
557         struct macvlan_dev *vlan = netdev_priv(dev);
558         struct net_device *lowerdev = vlan->lowerdev;
559 
560         if (dev->flags & IFF_UP) {
561                 if (change & IFF_ALLMULTI)
562                         dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
563         }
564 }
565 
566 static void macvlan_set_mac_lists(struct net_device *dev)
567 {
568         struct macvlan_dev *vlan = netdev_priv(dev);
569 
570         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
571                 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
572         } else {
573                 struct netdev_hw_addr *ha;
574                 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
575 
576                 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
577                 netdev_for_each_mc_addr(ha, dev) {
578                         __set_bit(mc_hash(vlan, ha->addr), filter);
579                 }
580 
581                 __set_bit(mc_hash(vlan, dev->broadcast), filter);
582 
583                 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
584         }
585         dev_uc_sync(vlan->lowerdev, dev);
586         dev_mc_sync(vlan->lowerdev, dev);
587 }
588 
589 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
590 {
591         struct macvlan_dev *vlan = netdev_priv(dev);
592 
593         if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
594                 return -EINVAL;
595         dev->mtu = new_mtu;
596         return 0;
597 }
598 
599 /*
600  * macvlan network devices have devices nesting below it and are a special
601  * "super class" of normal network devices; split their locks off into a
602  * separate class since they always nest.
603  */
604 static struct lock_class_key macvlan_netdev_xmit_lock_key;
605 static struct lock_class_key macvlan_netdev_addr_lock_key;
606 
607 #define ALWAYS_ON_FEATURES \
608         (NETIF_F_SG | NETIF_F_GEN_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX)
609 
610 #define MACVLAN_FEATURES \
611         (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
612          NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
613          NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
614          NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
615 
616 #define MACVLAN_STATE_MASK \
617         ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
618 
619 static int macvlan_get_nest_level(struct net_device *dev)
620 {
621         return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
622 }
623 
624 static void macvlan_set_lockdep_class_one(struct net_device *dev,
625                                           struct netdev_queue *txq,
626                                           void *_unused)
627 {
628         lockdep_set_class(&txq->_xmit_lock,
629                           &macvlan_netdev_xmit_lock_key);
630 }
631 
632 static void macvlan_set_lockdep_class(struct net_device *dev)
633 {
634         lockdep_set_class_and_subclass(&dev->addr_list_lock,
635                                        &macvlan_netdev_addr_lock_key,
636                                        macvlan_get_nest_level(dev));
637         netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
638 }
639 
640 static int macvlan_init(struct net_device *dev)
641 {
642         struct macvlan_dev *vlan = netdev_priv(dev);
643         const struct net_device *lowerdev = vlan->lowerdev;
644 
645         dev->state              = (dev->state & ~MACVLAN_STATE_MASK) |
646                                   (lowerdev->state & MACVLAN_STATE_MASK);
647         dev->features           = lowerdev->features & MACVLAN_FEATURES;
648         dev->features           |= ALWAYS_ON_FEATURES;
649         dev->vlan_features      = lowerdev->vlan_features & MACVLAN_FEATURES;
650         dev->gso_max_size       = lowerdev->gso_max_size;
651         dev->iflink             = lowerdev->ifindex;
652         dev->hard_header_len    = lowerdev->hard_header_len;
653 
654         macvlan_set_lockdep_class(dev);
655 
656         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
657         if (!vlan->pcpu_stats)
658                 return -ENOMEM;
659 
660         return 0;
661 }
662 
663 static void macvlan_uninit(struct net_device *dev)
664 {
665         struct macvlan_dev *vlan = netdev_priv(dev);
666         struct macvlan_port *port = vlan->port;
667 
668         free_percpu(vlan->pcpu_stats);
669 
670         port->count -= 1;
671         if (!port->count)
672                 macvlan_port_destroy(port->dev);
673 }
674 
675 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
676                                                          struct rtnl_link_stats64 *stats)
677 {
678         struct macvlan_dev *vlan = netdev_priv(dev);
679 
680         if (vlan->pcpu_stats) {
681                 struct vlan_pcpu_stats *p;
682                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
683                 u32 rx_errors = 0, tx_dropped = 0;
684                 unsigned int start;
685                 int i;
686 
687                 for_each_possible_cpu(i) {
688                         p = per_cpu_ptr(vlan->pcpu_stats, i);
689                         do {
690                                 start = u64_stats_fetch_begin_irq(&p->syncp);
691                                 rx_packets      = p->rx_packets;
692                                 rx_bytes        = p->rx_bytes;
693                                 rx_multicast    = p->rx_multicast;
694                                 tx_packets      = p->tx_packets;
695                                 tx_bytes        = p->tx_bytes;
696                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
697 
698                         stats->rx_packets       += rx_packets;
699                         stats->rx_bytes         += rx_bytes;
700                         stats->multicast        += rx_multicast;
701                         stats->tx_packets       += tx_packets;
702                         stats->tx_bytes         += tx_bytes;
703                         /* rx_errors & tx_dropped are u32, updated
704                          * without syncp protection.
705                          */
706                         rx_errors       += p->rx_errors;
707                         tx_dropped      += p->tx_dropped;
708                 }
709                 stats->rx_errors        = rx_errors;
710                 stats->rx_dropped       = rx_errors;
711                 stats->tx_dropped       = tx_dropped;
712         }
713         return stats;
714 }
715 
716 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
717                                    __be16 proto, u16 vid)
718 {
719         struct macvlan_dev *vlan = netdev_priv(dev);
720         struct net_device *lowerdev = vlan->lowerdev;
721 
722         return vlan_vid_add(lowerdev, proto, vid);
723 }
724 
725 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
726                                     __be16 proto, u16 vid)
727 {
728         struct macvlan_dev *vlan = netdev_priv(dev);
729         struct net_device *lowerdev = vlan->lowerdev;
730 
731         vlan_vid_del(lowerdev, proto, vid);
732         return 0;
733 }
734 
735 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
736                            struct net_device *dev,
737                            const unsigned char *addr,
738                            u16 flags)
739 {
740         struct macvlan_dev *vlan = netdev_priv(dev);
741         int err = -EINVAL;
742 
743         /* Support unicast filter only on passthru devices.
744          * Multicast filter should be allowed on all devices.
745          */
746         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
747                 return -EOPNOTSUPP;
748 
749         if (flags & NLM_F_REPLACE)
750                 return -EOPNOTSUPP;
751 
752         if (is_unicast_ether_addr(addr))
753                 err = dev_uc_add_excl(dev, addr);
754         else if (is_multicast_ether_addr(addr))
755                 err = dev_mc_add_excl(dev, addr);
756 
757         return err;
758 }
759 
760 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
761                            struct net_device *dev,
762                            const unsigned char *addr)
763 {
764         struct macvlan_dev *vlan = netdev_priv(dev);
765         int err = -EINVAL;
766 
767         /* Support unicast filter only on passthru devices.
768          * Multicast filter should be allowed on all devices.
769          */
770         if (!vlan->port->passthru && is_unicast_ether_addr(addr))
771                 return -EOPNOTSUPP;
772 
773         if (is_unicast_ether_addr(addr))
774                 err = dev_uc_del(dev, addr);
775         else if (is_multicast_ether_addr(addr))
776                 err = dev_mc_del(dev, addr);
777 
778         return err;
779 }
780 
781 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
782                                         struct ethtool_drvinfo *drvinfo)
783 {
784         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
785         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
786 }
787 
788 static int macvlan_ethtool_get_settings(struct net_device *dev,
789                                         struct ethtool_cmd *cmd)
790 {
791         const struct macvlan_dev *vlan = netdev_priv(dev);
792 
793         return __ethtool_get_settings(vlan->lowerdev, cmd);
794 }
795 
796 static netdev_features_t macvlan_fix_features(struct net_device *dev,
797                                               netdev_features_t features)
798 {
799         struct macvlan_dev *vlan = netdev_priv(dev);
800         netdev_features_t mask;
801 
802         features |= NETIF_F_ALL_FOR_ALL;
803         features &= (vlan->set_features | ~MACVLAN_FEATURES);
804         mask = features;
805 
806         features = netdev_increment_features(vlan->lowerdev->features,
807                                              features,
808                                              mask);
809         features |= ALWAYS_ON_FEATURES;
810         features &= ~NETIF_F_NETNS_LOCAL;
811 
812         return features;
813 }
814 
815 #ifdef CONFIG_NET_POLL_CONTROLLER
816 static void macvlan_dev_poll_controller(struct net_device *dev)
817 {
818         return;
819 }
820 
821 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
822 {
823         struct macvlan_dev *vlan = netdev_priv(dev);
824         struct net_device *real_dev = vlan->lowerdev;
825         struct netpoll *netpoll;
826         int err = 0;
827 
828         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
829         err = -ENOMEM;
830         if (!netpoll)
831                 goto out;
832 
833         err = __netpoll_setup(netpoll, real_dev);
834         if (err) {
835                 kfree(netpoll);
836                 goto out;
837         }
838 
839         vlan->netpoll = netpoll;
840 
841 out:
842         return err;
843 }
844 
845 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
846 {
847         struct macvlan_dev *vlan = netdev_priv(dev);
848         struct netpoll *netpoll = vlan->netpoll;
849 
850         if (!netpoll)
851                 return;
852 
853         vlan->netpoll = NULL;
854 
855         __netpoll_free_async(netpoll);
856 }
857 #endif  /* CONFIG_NET_POLL_CONTROLLER */
858 
859 static const struct ethtool_ops macvlan_ethtool_ops = {
860         .get_link               = ethtool_op_get_link,
861         .get_settings           = macvlan_ethtool_get_settings,
862         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
863 };
864 
865 static const struct net_device_ops macvlan_netdev_ops = {
866         .ndo_init               = macvlan_init,
867         .ndo_uninit             = macvlan_uninit,
868         .ndo_open               = macvlan_open,
869         .ndo_stop               = macvlan_stop,
870         .ndo_start_xmit         = macvlan_start_xmit,
871         .ndo_change_mtu         = macvlan_change_mtu,
872         .ndo_fix_features       = macvlan_fix_features,
873         .ndo_change_rx_flags    = macvlan_change_rx_flags,
874         .ndo_set_mac_address    = macvlan_set_mac_address,
875         .ndo_set_rx_mode        = macvlan_set_mac_lists,
876         .ndo_get_stats64        = macvlan_dev_get_stats64,
877         .ndo_validate_addr      = eth_validate_addr,
878         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
879         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
880         .ndo_fdb_add            = macvlan_fdb_add,
881         .ndo_fdb_del            = macvlan_fdb_del,
882         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
883         .ndo_get_lock_subclass  = macvlan_get_nest_level,
884 #ifdef CONFIG_NET_POLL_CONTROLLER
885         .ndo_poll_controller    = macvlan_dev_poll_controller,
886         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
887         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
888 #endif
889 };
890 
891 void macvlan_common_setup(struct net_device *dev)
892 {
893         ether_setup(dev);
894 
895         dev->priv_flags        &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
896         dev->priv_flags        |= IFF_UNICAST_FLT;
897         dev->netdev_ops         = &macvlan_netdev_ops;
898         dev->destructor         = free_netdev;
899         dev->header_ops         = &macvlan_hard_header_ops;
900         dev->ethtool_ops        = &macvlan_ethtool_ops;
901 }
902 EXPORT_SYMBOL_GPL(macvlan_common_setup);
903 
904 static void macvlan_setup(struct net_device *dev)
905 {
906         macvlan_common_setup(dev);
907         dev->tx_queue_len       = 0;
908 }
909 
910 static int macvlan_port_create(struct net_device *dev)
911 {
912         struct macvlan_port *port;
913         unsigned int i;
914         int err;
915 
916         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
917                 return -EINVAL;
918 
919         port = kzalloc(sizeof(*port), GFP_KERNEL);
920         if (port == NULL)
921                 return -ENOMEM;
922 
923         port->passthru = false;
924         port->dev = dev;
925         INIT_LIST_HEAD(&port->vlans);
926         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
927                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
928 
929         skb_queue_head_init(&port->bc_queue);
930         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
931 
932         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
933         if (err)
934                 kfree(port);
935         else
936                 dev->priv_flags |= IFF_MACVLAN_PORT;
937         return err;
938 }
939 
940 static void macvlan_port_destroy(struct net_device *dev)
941 {
942         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
943 
944         cancel_work_sync(&port->bc_work);
945         dev->priv_flags &= ~IFF_MACVLAN_PORT;
946         netdev_rx_handler_unregister(dev);
947         kfree_rcu(port, rcu);
948 }
949 
950 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
951 {
952         if (tb[IFLA_ADDRESS]) {
953                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
954                         return -EINVAL;
955                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
956                         return -EADDRNOTAVAIL;
957         }
958 
959         if (data && data[IFLA_MACVLAN_FLAGS] &&
960             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
961                 return -EINVAL;
962 
963         if (data && data[IFLA_MACVLAN_MODE]) {
964                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
965                 case MACVLAN_MODE_PRIVATE:
966                 case MACVLAN_MODE_VEPA:
967                 case MACVLAN_MODE_BRIDGE:
968                 case MACVLAN_MODE_PASSTHRU:
969                         break;
970                 default:
971                         return -EINVAL;
972                 }
973         }
974         return 0;
975 }
976 
977 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
978                            struct nlattr *tb[], struct nlattr *data[])
979 {
980         struct macvlan_dev *vlan = netdev_priv(dev);
981         struct macvlan_port *port;
982         struct net_device *lowerdev;
983         int err;
984 
985         if (!tb[IFLA_LINK])
986                 return -EINVAL;
987 
988         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
989         if (lowerdev == NULL)
990                 return -ENODEV;
991 
992         /* When creating macvlans or macvtaps on top of other macvlans - use
993          * the real device as the lowerdev.
994          */
995         if (netif_is_macvlan(lowerdev))
996                 lowerdev = macvlan_dev_real_dev(lowerdev);
997 
998         if (!tb[IFLA_MTU])
999                 dev->mtu = lowerdev->mtu;
1000         else if (dev->mtu > lowerdev->mtu)
1001                 return -EINVAL;
1002 
1003         if (!tb[IFLA_ADDRESS])
1004                 eth_hw_addr_random(dev);
1005 
1006         if (!macvlan_port_exists(lowerdev)) {
1007                 err = macvlan_port_create(lowerdev);
1008                 if (err < 0)
1009                         return err;
1010         }
1011         port = macvlan_port_get_rtnl(lowerdev);
1012 
1013         /* Only 1 macvlan device can be created in passthru mode */
1014         if (port->passthru)
1015                 return -EINVAL;
1016 
1017         vlan->lowerdev = lowerdev;
1018         vlan->dev      = dev;
1019         vlan->port     = port;
1020         vlan->set_features = MACVLAN_FEATURES;
1021         vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1022 
1023         vlan->mode     = MACVLAN_MODE_VEPA;
1024         if (data && data[IFLA_MACVLAN_MODE])
1025                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1026 
1027         if (data && data[IFLA_MACVLAN_FLAGS])
1028                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1029 
1030         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1031                 if (port->count)
1032                         return -EINVAL;
1033                 port->passthru = true;
1034                 eth_hw_addr_inherit(dev, lowerdev);
1035         }
1036 
1037         port->count += 1;
1038         err = register_netdevice(dev);
1039         if (err < 0)
1040                 goto destroy_port;
1041 
1042         dev->priv_flags |= IFF_MACVLAN;
1043         err = netdev_upper_dev_link(lowerdev, dev);
1044         if (err)
1045                 goto unregister_netdev;
1046 
1047         list_add_tail_rcu(&vlan->list, &port->vlans);
1048         netif_stacked_transfer_operstate(lowerdev, dev);
1049 
1050         return 0;
1051 
1052 unregister_netdev:
1053         unregister_netdevice(dev);
1054 destroy_port:
1055         port->count -= 1;
1056         if (!port->count)
1057                 macvlan_port_destroy(lowerdev);
1058 
1059         return err;
1060 }
1061 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1062 
1063 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1064                            struct nlattr *tb[], struct nlattr *data[])
1065 {
1066         return macvlan_common_newlink(src_net, dev, tb, data);
1067 }
1068 
1069 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1070 {
1071         struct macvlan_dev *vlan = netdev_priv(dev);
1072 
1073         list_del_rcu(&vlan->list);
1074         unregister_netdevice_queue(dev, head);
1075         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1076 }
1077 EXPORT_SYMBOL_GPL(macvlan_dellink);
1078 
1079 static int macvlan_changelink(struct net_device *dev,
1080                 struct nlattr *tb[], struct nlattr *data[])
1081 {
1082         struct macvlan_dev *vlan = netdev_priv(dev);
1083         enum macvlan_mode mode;
1084         bool set_mode = false;
1085 
1086         /* Validate mode, but don't set yet: setting flags may fail. */
1087         if (data && data[IFLA_MACVLAN_MODE]) {
1088                 set_mode = true;
1089                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1090                 /* Passthrough mode can't be set or cleared dynamically */
1091                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1092                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1093                         return -EINVAL;
1094         }
1095 
1096         if (data && data[IFLA_MACVLAN_FLAGS]) {
1097                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1098                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1099                 if (vlan->port->passthru && promisc) {
1100                         int err;
1101 
1102                         if (flags & MACVLAN_FLAG_NOPROMISC)
1103                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1104                         else
1105                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1106                         if (err < 0)
1107                                 return err;
1108                 }
1109                 vlan->flags = flags;
1110         }
1111         if (set_mode)
1112                 vlan->mode = mode;
1113         return 0;
1114 }
1115 
1116 static size_t macvlan_get_size(const struct net_device *dev)
1117 {
1118         return (0
1119                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1120                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1121                 );
1122 }
1123 
1124 static int macvlan_fill_info(struct sk_buff *skb,
1125                                 const struct net_device *dev)
1126 {
1127         struct macvlan_dev *vlan = netdev_priv(dev);
1128 
1129         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1130                 goto nla_put_failure;
1131         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1132                 goto nla_put_failure;
1133         return 0;
1134 
1135 nla_put_failure:
1136         return -EMSGSIZE;
1137 }
1138 
1139 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1140         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1141         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1142 };
1143 
1144 int macvlan_link_register(struct rtnl_link_ops *ops)
1145 {
1146         /* common fields */
1147         ops->priv_size          = sizeof(struct macvlan_dev);
1148         ops->validate           = macvlan_validate;
1149         ops->maxtype            = IFLA_MACVLAN_MAX;
1150         ops->policy             = macvlan_policy;
1151         ops->changelink         = macvlan_changelink;
1152         ops->get_size           = macvlan_get_size;
1153         ops->fill_info          = macvlan_fill_info;
1154 
1155         return rtnl_link_register(ops);
1156 };
1157 EXPORT_SYMBOL_GPL(macvlan_link_register);
1158 
1159 static struct rtnl_link_ops macvlan_link_ops = {
1160         .kind           = "macvlan",
1161         .setup          = macvlan_setup,
1162         .newlink        = macvlan_newlink,
1163         .dellink        = macvlan_dellink,
1164 };
1165 
1166 static int macvlan_device_event(struct notifier_block *unused,
1167                                 unsigned long event, void *ptr)
1168 {
1169         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1170         struct macvlan_dev *vlan, *next;
1171         struct macvlan_port *port;
1172         LIST_HEAD(list_kill);
1173 
1174         if (!macvlan_port_exists(dev))
1175                 return NOTIFY_DONE;
1176 
1177         port = macvlan_port_get_rtnl(dev);
1178 
1179         switch (event) {
1180         case NETDEV_CHANGE:
1181                 list_for_each_entry(vlan, &port->vlans, list)
1182                         netif_stacked_transfer_operstate(vlan->lowerdev,
1183                                                          vlan->dev);
1184                 break;
1185         case NETDEV_FEAT_CHANGE:
1186                 list_for_each_entry(vlan, &port->vlans, list) {
1187                         vlan->dev->gso_max_size = dev->gso_max_size;
1188                         netdev_update_features(vlan->dev);
1189                 }
1190                 break;
1191         case NETDEV_CHANGEMTU:
1192                 list_for_each_entry(vlan, &port->vlans, list) {
1193                         if (vlan->dev->mtu <= dev->mtu)
1194                                 continue;
1195                         dev_set_mtu(vlan->dev, dev->mtu);
1196                 }
1197                 break;
1198         case NETDEV_CHANGEADDR:
1199                 if (!port->passthru)
1200                         return NOTIFY_DONE;
1201 
1202                 vlan = list_first_entry_or_null(&port->vlans,
1203                                                 struct macvlan_dev,
1204                                                 list);
1205 
1206                 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1207                         return NOTIFY_BAD;
1208 
1209                 break;
1210         case NETDEV_UNREGISTER:
1211                 /* twiddle thumbs on netns device moves */
1212                 if (dev->reg_state != NETREG_UNREGISTERING)
1213                         break;
1214 
1215                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1216                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1217                 unregister_netdevice_many(&list_kill);
1218                 break;
1219         case NETDEV_PRE_TYPE_CHANGE:
1220                 /* Forbid underlaying device to change its type. */
1221                 return NOTIFY_BAD;
1222 
1223         case NETDEV_NOTIFY_PEERS:
1224         case NETDEV_BONDING_FAILOVER:
1225         case NETDEV_RESEND_IGMP:
1226                 /* Propagate to all vlans */
1227                 list_for_each_entry(vlan, &port->vlans, list)
1228                         call_netdevice_notifiers(event, vlan->dev);
1229         }
1230         return NOTIFY_DONE;
1231 }
1232 
1233 static struct notifier_block macvlan_notifier_block __read_mostly = {
1234         .notifier_call  = macvlan_device_event,
1235 };
1236 
1237 static int __init macvlan_init_module(void)
1238 {
1239         int err;
1240 
1241         register_netdevice_notifier(&macvlan_notifier_block);
1242 
1243         err = macvlan_link_register(&macvlan_link_ops);
1244         if (err < 0)
1245                 goto err1;
1246         return 0;
1247 err1:
1248         unregister_netdevice_notifier(&macvlan_notifier_block);
1249         return err;
1250 }
1251 
1252 static void __exit macvlan_cleanup_module(void)
1253 {
1254         rtnl_link_unregister(&macvlan_link_ops);
1255         unregister_netdevice_notifier(&macvlan_notifier_block);
1256 }
1257 
1258 module_init(macvlan_init_module);
1259 module_exit(macvlan_cleanup_module);
1260 
1261 MODULE_LICENSE("GPL");
1262 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1263 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1264 MODULE_ALIAS_RTNL_LINK("macvlan");
1265 

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