Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

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 
 40 struct macvlan_port {
 41         struct net_device       *dev;
 42         struct hlist_head       vlan_hash[MACVLAN_HASH_SIZE];
 43         struct list_head        vlans;
 44         struct rcu_head         rcu;
 45         struct sk_buff_head     bc_queue;
 46         struct work_struct      bc_work;
 47         bool                    passthru;
 48 };
 49 
 50 #define MACVLAN_PORT_IS_EMPTY(port)    list_empty(&port->vlans)
 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) < skb->dev->tx_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->gso_max_size       = lowerdev->gso_max_size;
650         dev->iflink             = lowerdev->ifindex;
651         dev->hard_header_len    = lowerdev->hard_header_len;
652 
653         macvlan_set_lockdep_class(dev);
654 
655         vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
656         if (!vlan->pcpu_stats)
657                 return -ENOMEM;
658 
659         return 0;
660 }
661 
662 static void macvlan_uninit(struct net_device *dev)
663 {
664         struct macvlan_dev *vlan = netdev_priv(dev);
665         struct macvlan_port *port = vlan->port;
666 
667         free_percpu(vlan->pcpu_stats);
668 
669         if (MACVLAN_PORT_IS_EMPTY(port))
670                 macvlan_port_destroy(port->dev);
671 }
672 
673 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
674                                                          struct rtnl_link_stats64 *stats)
675 {
676         struct macvlan_dev *vlan = netdev_priv(dev);
677 
678         if (vlan->pcpu_stats) {
679                 struct vlan_pcpu_stats *p;
680                 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
681                 u32 rx_errors = 0, tx_dropped = 0;
682                 unsigned int start;
683                 int i;
684 
685                 for_each_possible_cpu(i) {
686                         p = per_cpu_ptr(vlan->pcpu_stats, i);
687                         do {
688                                 start = u64_stats_fetch_begin_irq(&p->syncp);
689                                 rx_packets      = p->rx_packets;
690                                 rx_bytes        = p->rx_bytes;
691                                 rx_multicast    = p->rx_multicast;
692                                 tx_packets      = p->tx_packets;
693                                 tx_bytes        = p->tx_bytes;
694                         } while (u64_stats_fetch_retry_irq(&p->syncp, start));
695 
696                         stats->rx_packets       += rx_packets;
697                         stats->rx_bytes         += rx_bytes;
698                         stats->multicast        += rx_multicast;
699                         stats->tx_packets       += tx_packets;
700                         stats->tx_bytes         += tx_bytes;
701                         /* rx_errors & tx_dropped are u32, updated
702                          * without syncp protection.
703                          */
704                         rx_errors       += p->rx_errors;
705                         tx_dropped      += p->tx_dropped;
706                 }
707                 stats->rx_errors        = rx_errors;
708                 stats->rx_dropped       = rx_errors;
709                 stats->tx_dropped       = tx_dropped;
710         }
711         return stats;
712 }
713 
714 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
715                                    __be16 proto, u16 vid)
716 {
717         struct macvlan_dev *vlan = netdev_priv(dev);
718         struct net_device *lowerdev = vlan->lowerdev;
719 
720         return vlan_vid_add(lowerdev, proto, vid);
721 }
722 
723 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
724                                     __be16 proto, u16 vid)
725 {
726         struct macvlan_dev *vlan = netdev_priv(dev);
727         struct net_device *lowerdev = vlan->lowerdev;
728 
729         vlan_vid_del(lowerdev, proto, vid);
730         return 0;
731 }
732 
733 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
734                            struct net_device *dev,
735                            const unsigned char *addr,
736                            u16 flags)
737 {
738         struct macvlan_dev *vlan = netdev_priv(dev);
739         int err = -EINVAL;
740 
741         if (!vlan->port->passthru)
742                 return -EOPNOTSUPP;
743 
744         if (flags & NLM_F_REPLACE)
745                 return -EOPNOTSUPP;
746 
747         if (is_unicast_ether_addr(addr))
748                 err = dev_uc_add_excl(dev, addr);
749         else if (is_multicast_ether_addr(addr))
750                 err = dev_mc_add_excl(dev, addr);
751 
752         return err;
753 }
754 
755 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
756                            struct net_device *dev,
757                            const unsigned char *addr)
758 {
759         struct macvlan_dev *vlan = netdev_priv(dev);
760         int err = -EINVAL;
761 
762         if (!vlan->port->passthru)
763                 return -EOPNOTSUPP;
764 
765         if (is_unicast_ether_addr(addr))
766                 err = dev_uc_del(dev, addr);
767         else if (is_multicast_ether_addr(addr))
768                 err = dev_mc_del(dev, addr);
769 
770         return err;
771 }
772 
773 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
774                                         struct ethtool_drvinfo *drvinfo)
775 {
776         strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
777         strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
778 }
779 
780 static int macvlan_ethtool_get_settings(struct net_device *dev,
781                                         struct ethtool_cmd *cmd)
782 {
783         const struct macvlan_dev *vlan = netdev_priv(dev);
784 
785         return __ethtool_get_settings(vlan->lowerdev, cmd);
786 }
787 
788 static netdev_features_t macvlan_fix_features(struct net_device *dev,
789                                               netdev_features_t features)
790 {
791         struct macvlan_dev *vlan = netdev_priv(dev);
792         netdev_features_t mask;
793 
794         features |= NETIF_F_ALL_FOR_ALL;
795         features &= (vlan->set_features | ~MACVLAN_FEATURES);
796         mask = features;
797 
798         features = netdev_increment_features(vlan->lowerdev->features,
799                                              features,
800                                              mask);
801         features |= ALWAYS_ON_FEATURES;
802 
803         return features;
804 }
805 
806 #ifdef CONFIG_NET_POLL_CONTROLLER
807 static void macvlan_dev_poll_controller(struct net_device *dev)
808 {
809         return;
810 }
811 
812 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
813 {
814         struct macvlan_dev *vlan = netdev_priv(dev);
815         struct net_device *real_dev = vlan->lowerdev;
816         struct netpoll *netpoll;
817         int err = 0;
818 
819         netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
820         err = -ENOMEM;
821         if (!netpoll)
822                 goto out;
823 
824         err = __netpoll_setup(netpoll, real_dev);
825         if (err) {
826                 kfree(netpoll);
827                 goto out;
828         }
829 
830         vlan->netpoll = netpoll;
831 
832 out:
833         return err;
834 }
835 
836 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
837 {
838         struct macvlan_dev *vlan = netdev_priv(dev);
839         struct netpoll *netpoll = vlan->netpoll;
840 
841         if (!netpoll)
842                 return;
843 
844         vlan->netpoll = NULL;
845 
846         __netpoll_free_async(netpoll);
847 }
848 #endif  /* CONFIG_NET_POLL_CONTROLLER */
849 
850 static const struct ethtool_ops macvlan_ethtool_ops = {
851         .get_link               = ethtool_op_get_link,
852         .get_settings           = macvlan_ethtool_get_settings,
853         .get_drvinfo            = macvlan_ethtool_get_drvinfo,
854 };
855 
856 static const struct net_device_ops macvlan_netdev_ops = {
857         .ndo_init               = macvlan_init,
858         .ndo_uninit             = macvlan_uninit,
859         .ndo_open               = macvlan_open,
860         .ndo_stop               = macvlan_stop,
861         .ndo_start_xmit         = macvlan_start_xmit,
862         .ndo_change_mtu         = macvlan_change_mtu,
863         .ndo_fix_features       = macvlan_fix_features,
864         .ndo_change_rx_flags    = macvlan_change_rx_flags,
865         .ndo_set_mac_address    = macvlan_set_mac_address,
866         .ndo_set_rx_mode        = macvlan_set_mac_lists,
867         .ndo_get_stats64        = macvlan_dev_get_stats64,
868         .ndo_validate_addr      = eth_validate_addr,
869         .ndo_vlan_rx_add_vid    = macvlan_vlan_rx_add_vid,
870         .ndo_vlan_rx_kill_vid   = macvlan_vlan_rx_kill_vid,
871         .ndo_fdb_add            = macvlan_fdb_add,
872         .ndo_fdb_del            = macvlan_fdb_del,
873         .ndo_fdb_dump           = ndo_dflt_fdb_dump,
874         .ndo_get_lock_subclass  = macvlan_get_nest_level,
875 #ifdef CONFIG_NET_POLL_CONTROLLER
876         .ndo_poll_controller    = macvlan_dev_poll_controller,
877         .ndo_netpoll_setup      = macvlan_dev_netpoll_setup,
878         .ndo_netpoll_cleanup    = macvlan_dev_netpoll_cleanup,
879 #endif
880 };
881 
882 void macvlan_common_setup(struct net_device *dev)
883 {
884         ether_setup(dev);
885 
886         dev->priv_flags        &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
887         dev->priv_flags        |= IFF_UNICAST_FLT;
888         dev->netdev_ops         = &macvlan_netdev_ops;
889         dev->destructor         = free_netdev;
890         dev->header_ops         = &macvlan_hard_header_ops;
891         dev->ethtool_ops        = &macvlan_ethtool_ops;
892 }
893 EXPORT_SYMBOL_GPL(macvlan_common_setup);
894 
895 static void macvlan_setup(struct net_device *dev)
896 {
897         macvlan_common_setup(dev);
898         dev->tx_queue_len       = 0;
899 }
900 
901 static int macvlan_port_create(struct net_device *dev)
902 {
903         struct macvlan_port *port;
904         unsigned int i;
905         int err;
906 
907         if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
908                 return -EINVAL;
909 
910         port = kzalloc(sizeof(*port), GFP_KERNEL);
911         if (port == NULL)
912                 return -ENOMEM;
913 
914         port->passthru = false;
915         port->dev = dev;
916         INIT_LIST_HEAD(&port->vlans);
917         for (i = 0; i < MACVLAN_HASH_SIZE; i++)
918                 INIT_HLIST_HEAD(&port->vlan_hash[i]);
919 
920         skb_queue_head_init(&port->bc_queue);
921         INIT_WORK(&port->bc_work, macvlan_process_broadcast);
922 
923         err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
924         if (err)
925                 kfree(port);
926         else
927                 dev->priv_flags |= IFF_MACVLAN_PORT;
928         return err;
929 }
930 
931 static void macvlan_port_destroy(struct net_device *dev)
932 {
933         struct macvlan_port *port = macvlan_port_get_rtnl(dev);
934 
935         cancel_work_sync(&port->bc_work);
936         dev->priv_flags &= ~IFF_MACVLAN_PORT;
937         netdev_rx_handler_unregister(dev);
938         kfree_rcu(port, rcu);
939 }
940 
941 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
942 {
943         if (tb[IFLA_ADDRESS]) {
944                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
945                         return -EINVAL;
946                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
947                         return -EADDRNOTAVAIL;
948         }
949 
950         if (data && data[IFLA_MACVLAN_FLAGS] &&
951             nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
952                 return -EINVAL;
953 
954         if (data && data[IFLA_MACVLAN_MODE]) {
955                 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
956                 case MACVLAN_MODE_PRIVATE:
957                 case MACVLAN_MODE_VEPA:
958                 case MACVLAN_MODE_BRIDGE:
959                 case MACVLAN_MODE_PASSTHRU:
960                         break;
961                 default:
962                         return -EINVAL;
963                 }
964         }
965         return 0;
966 }
967 
968 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
969                            struct nlattr *tb[], struct nlattr *data[])
970 {
971         struct macvlan_dev *vlan = netdev_priv(dev);
972         struct macvlan_port *port;
973         struct net_device *lowerdev;
974         int err;
975 
976         if (!tb[IFLA_LINK])
977                 return -EINVAL;
978 
979         lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
980         if (lowerdev == NULL)
981                 return -ENODEV;
982 
983         /* When creating macvlans or macvtaps on top of other macvlans - use
984          * the real device as the lowerdev.
985          */
986         if (netif_is_macvlan(lowerdev))
987                 lowerdev = macvlan_dev_real_dev(lowerdev);
988 
989         if (!tb[IFLA_MTU])
990                 dev->mtu = lowerdev->mtu;
991         else if (dev->mtu > lowerdev->mtu)
992                 return -EINVAL;
993 
994         if (!tb[IFLA_ADDRESS])
995                 eth_hw_addr_random(dev);
996 
997         if (!macvlan_port_exists(lowerdev)) {
998                 err = macvlan_port_create(lowerdev);
999                 if (err < 0)
1000                         return err;
1001         }
1002         port = macvlan_port_get_rtnl(lowerdev);
1003 
1004         /* Only 1 macvlan device can be created in passthru mode */
1005         if (port->passthru)
1006                 return -EINVAL;
1007 
1008         vlan->lowerdev = lowerdev;
1009         vlan->dev      = dev;
1010         vlan->port     = port;
1011         vlan->set_features = MACVLAN_FEATURES;
1012         vlan->nest_level = dev_get_nest_level(lowerdev, netif_is_macvlan) + 1;
1013 
1014         vlan->mode     = MACVLAN_MODE_VEPA;
1015         if (data && data[IFLA_MACVLAN_MODE])
1016                 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1017 
1018         if (data && data[IFLA_MACVLAN_FLAGS])
1019                 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1020 
1021         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1022                 if (!MACVLAN_PORT_IS_EMPTY(port))
1023                         return -EINVAL;
1024                 port->passthru = true;
1025                 eth_hw_addr_inherit(dev, lowerdev);
1026         }
1027 
1028         err = register_netdevice(dev);
1029         if (err < 0)
1030                 goto destroy_port;
1031 
1032         dev->priv_flags |= IFF_MACVLAN;
1033         err = netdev_upper_dev_link(lowerdev, dev);
1034         if (err)
1035                 goto unregister_netdev;
1036 
1037         list_add_tail_rcu(&vlan->list, &port->vlans);
1038         netif_stacked_transfer_operstate(lowerdev, dev);
1039 
1040         return 0;
1041 
1042 unregister_netdev:
1043         unregister_netdevice(dev);
1044 destroy_port:
1045         if (MACVLAN_PORT_IS_EMPTY(port))
1046                 macvlan_port_destroy(lowerdev);
1047 
1048         return err;
1049 }
1050 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1051 
1052 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1053                            struct nlattr *tb[], struct nlattr *data[])
1054 {
1055         return macvlan_common_newlink(src_net, dev, tb, data);
1056 }
1057 
1058 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1059 {
1060         struct macvlan_dev *vlan = netdev_priv(dev);
1061 
1062         list_del_rcu(&vlan->list);
1063         unregister_netdevice_queue(dev, head);
1064         netdev_upper_dev_unlink(vlan->lowerdev, dev);
1065 }
1066 EXPORT_SYMBOL_GPL(macvlan_dellink);
1067 
1068 static int macvlan_changelink(struct net_device *dev,
1069                 struct nlattr *tb[], struct nlattr *data[])
1070 {
1071         struct macvlan_dev *vlan = netdev_priv(dev);
1072         enum macvlan_mode mode;
1073         bool set_mode = false;
1074 
1075         /* Validate mode, but don't set yet: setting flags may fail. */
1076         if (data && data[IFLA_MACVLAN_MODE]) {
1077                 set_mode = true;
1078                 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1079                 /* Passthrough mode can't be set or cleared dynamically */
1080                 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1081                     (vlan->mode == MACVLAN_MODE_PASSTHRU))
1082                         return -EINVAL;
1083         }
1084 
1085         if (data && data[IFLA_MACVLAN_FLAGS]) {
1086                 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1087                 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1088                 if (vlan->port->passthru && promisc) {
1089                         int err;
1090 
1091                         if (flags & MACVLAN_FLAG_NOPROMISC)
1092                                 err = dev_set_promiscuity(vlan->lowerdev, -1);
1093                         else
1094                                 err = dev_set_promiscuity(vlan->lowerdev, 1);
1095                         if (err < 0)
1096                                 return err;
1097                 }
1098                 vlan->flags = flags;
1099         }
1100         if (set_mode)
1101                 vlan->mode = mode;
1102         return 0;
1103 }
1104 
1105 static size_t macvlan_get_size(const struct net_device *dev)
1106 {
1107         return (0
1108                 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1109                 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1110                 );
1111 }
1112 
1113 static int macvlan_fill_info(struct sk_buff *skb,
1114                                 const struct net_device *dev)
1115 {
1116         struct macvlan_dev *vlan = netdev_priv(dev);
1117 
1118         if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1119                 goto nla_put_failure;
1120         if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1121                 goto nla_put_failure;
1122         return 0;
1123 
1124 nla_put_failure:
1125         return -EMSGSIZE;
1126 }
1127 
1128 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1129         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
1130         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1131 };
1132 
1133 int macvlan_link_register(struct rtnl_link_ops *ops)
1134 {
1135         /* common fields */
1136         ops->priv_size          = sizeof(struct macvlan_dev);
1137         ops->validate           = macvlan_validate;
1138         ops->maxtype            = IFLA_MACVLAN_MAX;
1139         ops->policy             = macvlan_policy;
1140         ops->changelink         = macvlan_changelink;
1141         ops->get_size           = macvlan_get_size;
1142         ops->fill_info          = macvlan_fill_info;
1143 
1144         return rtnl_link_register(ops);
1145 };
1146 EXPORT_SYMBOL_GPL(macvlan_link_register);
1147 
1148 static struct rtnl_link_ops macvlan_link_ops = {
1149         .kind           = "macvlan",
1150         .setup          = macvlan_setup,
1151         .newlink        = macvlan_newlink,
1152         .dellink        = macvlan_dellink,
1153 };
1154 
1155 static int macvlan_device_event(struct notifier_block *unused,
1156                                 unsigned long event, void *ptr)
1157 {
1158         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1159         struct macvlan_dev *vlan, *next;
1160         struct macvlan_port *port;
1161         LIST_HEAD(list_kill);
1162 
1163         if (!macvlan_port_exists(dev))
1164                 return NOTIFY_DONE;
1165 
1166         port = macvlan_port_get_rtnl(dev);
1167 
1168         switch (event) {
1169         case NETDEV_CHANGE:
1170                 list_for_each_entry(vlan, &port->vlans, list)
1171                         netif_stacked_transfer_operstate(vlan->lowerdev,
1172                                                          vlan->dev);
1173                 break;
1174         case NETDEV_FEAT_CHANGE:
1175                 list_for_each_entry(vlan, &port->vlans, list) {
1176                         vlan->dev->gso_max_size = dev->gso_max_size;
1177                         netdev_update_features(vlan->dev);
1178                 }
1179                 break;
1180         case NETDEV_CHANGEMTU:
1181                 list_for_each_entry(vlan, &port->vlans, list) {
1182                         if (vlan->dev->mtu <= dev->mtu)
1183                                 continue;
1184                         dev_set_mtu(vlan->dev, dev->mtu);
1185                 }
1186                 break;
1187         case NETDEV_CHANGEADDR:
1188                 if (!port->passthru)
1189                         return NOTIFY_DONE;
1190 
1191                 vlan = list_first_entry_or_null(&port->vlans,
1192                                                 struct macvlan_dev,
1193                                                 list);
1194 
1195                 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1196                         return NOTIFY_BAD;
1197 
1198                 break;
1199         case NETDEV_UNREGISTER:
1200                 /* twiddle thumbs on netns device moves */
1201                 if (dev->reg_state != NETREG_UNREGISTERING)
1202                         break;
1203 
1204                 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1205                         vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1206                 unregister_netdevice_many(&list_kill);
1207                 break;
1208         case NETDEV_PRE_TYPE_CHANGE:
1209                 /* Forbid underlaying device to change its type. */
1210                 return NOTIFY_BAD;
1211 
1212         case NETDEV_NOTIFY_PEERS:
1213         case NETDEV_BONDING_FAILOVER:
1214         case NETDEV_RESEND_IGMP:
1215                 /* Propagate to all vlans */
1216                 list_for_each_entry(vlan, &port->vlans, list)
1217                         call_netdevice_notifiers(event, vlan->dev);
1218         }
1219         return NOTIFY_DONE;
1220 }
1221 
1222 static struct notifier_block macvlan_notifier_block __read_mostly = {
1223         .notifier_call  = macvlan_device_event,
1224 };
1225 
1226 static int __init macvlan_init_module(void)
1227 {
1228         int err;
1229 
1230         register_netdevice_notifier(&macvlan_notifier_block);
1231 
1232         err = macvlan_link_register(&macvlan_link_ops);
1233         if (err < 0)
1234                 goto err1;
1235         return 0;
1236 err1:
1237         unregister_netdevice_notifier(&macvlan_notifier_block);
1238         return err;
1239 }
1240 
1241 static void __exit macvlan_cleanup_module(void)
1242 {
1243         rtnl_link_unregister(&macvlan_link_ops);
1244         unregister_netdevice_notifier(&macvlan_notifier_block);
1245 }
1246 
1247 module_init(macvlan_init_module);
1248 module_exit(macvlan_cleanup_module);
1249 
1250 MODULE_LICENSE("GPL");
1251 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1252 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1253 MODULE_ALIAS_RTNL_LINK("macvlan");
1254 

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