2 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
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.
9 * The code this is based on carried the following copyright notice:
11 * (C) Copyright 2001-2006
12 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
13 * Re-worked by Ben Greear <greearb@candelatech.com>
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/errno.h>
21 #include <linux/slab.h>
22 #include <linux/string.h>
23 #include <linux/rculist.h>
24 #include <linux/notifier.h>
25 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h>
27 #include <linux/ethtool.h>
28 #include <linux/if_arp.h>
29 #include <linux/if_vlan.h>
30 #include <linux/if_link.h>
31 #include <linux/if_macvlan.h>
32 #include <linux/hash.h>
33 #include <net/rtnetlink.h>
36 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
39 struct net_device
*dev
;
40 struct hlist_head vlan_hash
[MACVLAN_HASH_SIZE
];
41 struct list_head vlans
;
47 static void macvlan_port_destroy(struct net_device
*dev
);
49 static struct macvlan_port
*macvlan_port_get_rcu(const struct net_device
*dev
)
51 return rcu_dereference(dev
->rx_handler_data
);
54 static struct macvlan_port
*macvlan_port_get_rtnl(const struct net_device
*dev
)
56 return rtnl_dereference(dev
->rx_handler_data
);
59 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
61 static struct macvlan_dev
*macvlan_hash_lookup(const struct macvlan_port
*port
,
62 const unsigned char *addr
)
64 struct macvlan_dev
*vlan
;
66 hlist_for_each_entry_rcu(vlan
, &port
->vlan_hash
[addr
[5]], hlist
) {
67 if (ether_addr_equal_64bits(vlan
->dev
->dev_addr
, addr
))
73 static void macvlan_hash_add(struct macvlan_dev
*vlan
)
75 struct macvlan_port
*port
= vlan
->port
;
76 const unsigned char *addr
= vlan
->dev
->dev_addr
;
78 hlist_add_head_rcu(&vlan
->hlist
, &port
->vlan_hash
[addr
[5]]);
81 static void macvlan_hash_del(struct macvlan_dev
*vlan
, bool sync
)
83 hlist_del_rcu(&vlan
->hlist
);
88 static void macvlan_hash_change_addr(struct macvlan_dev
*vlan
,
89 const unsigned char *addr
)
91 macvlan_hash_del(vlan
, true);
92 /* Now that we are unhashed it is safe to change the device
93 * address without confusing packet delivery.
95 memcpy(vlan
->dev
->dev_addr
, addr
, ETH_ALEN
);
96 macvlan_hash_add(vlan
);
99 static int macvlan_addr_busy(const struct macvlan_port
*port
,
100 const unsigned char *addr
)
102 /* Test to see if the specified multicast address is
103 * currently in use by the underlying device or
106 if (ether_addr_equal_64bits(port
->dev
->dev_addr
, addr
))
109 if (macvlan_hash_lookup(port
, addr
))
116 static int macvlan_broadcast_one(struct sk_buff
*skb
,
117 const struct macvlan_dev
*vlan
,
118 const struct ethhdr
*eth
, bool local
)
120 struct net_device
*dev
= vlan
->dev
;
125 return vlan
->forward(dev
, skb
);
128 if (ether_addr_equal_64bits(eth
->h_dest
, dev
->broadcast
))
129 skb
->pkt_type
= PACKET_BROADCAST
;
131 skb
->pkt_type
= PACKET_MULTICAST
;
133 return vlan
->receive(skb
);
136 static u32
macvlan_hash_mix(const struct macvlan_dev
*vlan
)
138 return (u32
)(((unsigned long)vlan
) >> L1_CACHE_SHIFT
);
142 static unsigned int mc_hash(const struct macvlan_dev
*vlan
,
143 const unsigned char *addr
)
145 u32 val
= __get_unaligned_cpu32(addr
+ 2);
147 val
^= macvlan_hash_mix(vlan
);
148 return hash_32(val
, MACVLAN_MC_FILTER_BITS
);
151 static void macvlan_broadcast(struct sk_buff
*skb
,
152 const struct macvlan_port
*port
,
153 struct net_device
*src
,
154 enum macvlan_mode mode
)
156 const struct ethhdr
*eth
= eth_hdr(skb
);
157 const struct macvlan_dev
*vlan
;
158 struct sk_buff
*nskb
;
163 if (skb
->protocol
== htons(ETH_P_PAUSE
))
166 for (i
= 0; i
< MACVLAN_HASH_SIZE
; i
++) {
167 hlist_for_each_entry_rcu(vlan
, &port
->vlan_hash
[i
], hlist
) {
168 if (vlan
->dev
== src
|| !(vlan
->mode
& mode
))
171 hash
= mc_hash(vlan
, eth
->h_dest
);
172 if (!test_bit(hash
, vlan
->mc_filter
))
174 nskb
= skb_clone(skb
, GFP_ATOMIC
);
175 err
= macvlan_broadcast_one(nskb
, vlan
, eth
,
176 mode
== MACVLAN_MODE_BRIDGE
);
177 macvlan_count_rx(vlan
, skb
->len
+ ETH_HLEN
,
178 err
== NET_RX_SUCCESS
, 1);
183 /* called under rcu_read_lock() from netif_receive_skb */
184 static rx_handler_result_t
macvlan_handle_frame(struct sk_buff
**pskb
)
186 struct macvlan_port
*port
;
187 struct sk_buff
*skb
= *pskb
;
188 const struct ethhdr
*eth
= eth_hdr(skb
);
189 const struct macvlan_dev
*vlan
;
190 const struct macvlan_dev
*src
;
191 struct net_device
*dev
;
192 unsigned int len
= 0;
193 int ret
= NET_RX_DROP
;
195 port
= macvlan_port_get_rcu(skb
->dev
);
196 if (is_multicast_ether_addr(eth
->h_dest
)) {
197 skb
= ip_check_defrag(skb
, IP_DEFRAG_MACVLAN
);
199 return RX_HANDLER_CONSUMED
;
201 src
= macvlan_hash_lookup(port
, eth
->h_source
);
203 /* frame comes from an external address */
204 macvlan_broadcast(skb
, port
, NULL
,
205 MACVLAN_MODE_PRIVATE
|
207 MACVLAN_MODE_PASSTHRU
|
208 MACVLAN_MODE_BRIDGE
);
209 else if (src
->mode
== MACVLAN_MODE_VEPA
)
210 /* flood to everyone except source */
211 macvlan_broadcast(skb
, port
, src
->dev
,
213 MACVLAN_MODE_BRIDGE
);
214 else if (src
->mode
== MACVLAN_MODE_BRIDGE
)
216 * flood only to VEPA ports, bridge ports
217 * already saw the frame on the way out.
219 macvlan_broadcast(skb
, port
, src
->dev
,
222 /* forward to original port. */
224 ret
= macvlan_broadcast_one(skb
, vlan
, eth
, 0);
228 return RX_HANDLER_PASS
;
232 vlan
= list_first_or_null_rcu(&port
->vlans
,
233 struct macvlan_dev
, list
);
235 vlan
= macvlan_hash_lookup(port
, eth
->h_dest
);
237 return RX_HANDLER_PASS
;
240 if (unlikely(!(dev
->flags
& IFF_UP
))) {
242 return RX_HANDLER_CONSUMED
;
244 len
= skb
->len
+ ETH_HLEN
;
245 skb
= skb_share_check(skb
, GFP_ATOMIC
);
250 skb
->pkt_type
= PACKET_HOST
;
252 ret
= vlan
->receive(skb
);
255 macvlan_count_rx(vlan
, len
, ret
== NET_RX_SUCCESS
, 0);
256 return RX_HANDLER_CONSUMED
;
259 static int macvlan_queue_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
261 const struct macvlan_dev
*vlan
= netdev_priv(dev
);
262 const struct macvlan_port
*port
= vlan
->port
;
263 const struct macvlan_dev
*dest
;
264 __u8 ip_summed
= skb
->ip_summed
;
266 if (vlan
->mode
== MACVLAN_MODE_BRIDGE
) {
267 const struct ethhdr
*eth
= (void *)skb
->data
;
268 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
270 /* send to other bridge ports directly */
271 if (is_multicast_ether_addr(eth
->h_dest
)) {
272 macvlan_broadcast(skb
, port
, dev
, MACVLAN_MODE_BRIDGE
);
276 dest
= macvlan_hash_lookup(port
, eth
->h_dest
);
277 if (dest
&& dest
->mode
== MACVLAN_MODE_BRIDGE
) {
278 /* send to lowerdev first for its network taps */
279 dev_forward_skb(vlan
->lowerdev
, skb
);
281 return NET_XMIT_SUCCESS
;
286 skb
->ip_summed
= ip_summed
;
287 skb
->dev
= vlan
->lowerdev
;
288 return dev_queue_xmit(skb
);
291 netdev_tx_t
macvlan_start_xmit(struct sk_buff
*skb
,
292 struct net_device
*dev
)
294 unsigned int len
= skb
->len
;
296 const struct macvlan_dev
*vlan
= netdev_priv(dev
);
298 ret
= macvlan_queue_xmit(skb
, dev
);
299 if (likely(ret
== NET_XMIT_SUCCESS
|| ret
== NET_XMIT_CN
)) {
300 struct macvlan_pcpu_stats
*pcpu_stats
;
302 pcpu_stats
= this_cpu_ptr(vlan
->pcpu_stats
);
303 u64_stats_update_begin(&pcpu_stats
->syncp
);
304 pcpu_stats
->tx_packets
++;
305 pcpu_stats
->tx_bytes
+= len
;
306 u64_stats_update_end(&pcpu_stats
->syncp
);
308 this_cpu_inc(vlan
->pcpu_stats
->tx_dropped
);
312 EXPORT_SYMBOL_GPL(macvlan_start_xmit
);
314 static int macvlan_hard_header(struct sk_buff
*skb
, struct net_device
*dev
,
315 unsigned short type
, const void *daddr
,
316 const void *saddr
, unsigned len
)
318 const struct macvlan_dev
*vlan
= netdev_priv(dev
);
319 struct net_device
*lowerdev
= vlan
->lowerdev
;
321 return dev_hard_header(skb
, lowerdev
, type
, daddr
,
322 saddr
? : dev
->dev_addr
, len
);
325 static const struct header_ops macvlan_hard_header_ops
= {
326 .create
= macvlan_hard_header
,
327 .rebuild
= eth_rebuild_header
,
328 .parse
= eth_header_parse
,
329 .cache
= eth_header_cache
,
330 .cache_update
= eth_header_cache_update
,
333 static int macvlan_open(struct net_device
*dev
)
335 struct macvlan_dev
*vlan
= netdev_priv(dev
);
336 struct net_device
*lowerdev
= vlan
->lowerdev
;
339 if (vlan
->port
->passthru
) {
340 if (!(vlan
->flags
& MACVLAN_FLAG_NOPROMISC
)) {
341 err
= dev_set_promiscuity(lowerdev
, 1);
349 if (macvlan_addr_busy(vlan
->port
, dev
->dev_addr
))
352 err
= dev_uc_add(lowerdev
, dev
->dev_addr
);
355 if (dev
->flags
& IFF_ALLMULTI
) {
356 err
= dev_set_allmulti(lowerdev
, 1);
362 macvlan_hash_add(vlan
);
366 dev_uc_del(lowerdev
, dev
->dev_addr
);
371 static int macvlan_stop(struct net_device
*dev
)
373 struct macvlan_dev
*vlan
= netdev_priv(dev
);
374 struct net_device
*lowerdev
= vlan
->lowerdev
;
376 dev_uc_unsync(lowerdev
, dev
);
377 dev_mc_unsync(lowerdev
, dev
);
379 if (vlan
->port
->passthru
) {
380 if (!(vlan
->flags
& MACVLAN_FLAG_NOPROMISC
))
381 dev_set_promiscuity(lowerdev
, -1);
385 if (dev
->flags
& IFF_ALLMULTI
)
386 dev_set_allmulti(lowerdev
, -1);
388 dev_uc_del(lowerdev
, dev
->dev_addr
);
391 macvlan_hash_del(vlan
, !dev
->dismantle
);
395 static int macvlan_set_mac_address(struct net_device
*dev
, void *p
)
397 struct macvlan_dev
*vlan
= netdev_priv(dev
);
398 struct net_device
*lowerdev
= vlan
->lowerdev
;
399 struct sockaddr
*addr
= p
;
402 if (!is_valid_ether_addr(addr
->sa_data
))
403 return -EADDRNOTAVAIL
;
405 if (!(dev
->flags
& IFF_UP
)) {
406 /* Just copy in the new address */
407 memcpy(dev
->dev_addr
, addr
->sa_data
, ETH_ALEN
);
409 /* Rehash and update the device filters */
410 if (macvlan_addr_busy(vlan
->port
, addr
->sa_data
))
413 err
= dev_uc_add(lowerdev
, addr
->sa_data
);
417 dev_uc_del(lowerdev
, dev
->dev_addr
);
419 macvlan_hash_change_addr(vlan
, addr
->sa_data
);
424 static void macvlan_change_rx_flags(struct net_device
*dev
, int change
)
426 struct macvlan_dev
*vlan
= netdev_priv(dev
);
427 struct net_device
*lowerdev
= vlan
->lowerdev
;
429 if (change
& IFF_ALLMULTI
)
430 dev_set_allmulti(lowerdev
, dev
->flags
& IFF_ALLMULTI
? 1 : -1);
433 static void macvlan_set_mac_lists(struct net_device
*dev
)
435 struct macvlan_dev
*vlan
= netdev_priv(dev
);
437 if (dev
->flags
& (IFF_PROMISC
| IFF_ALLMULTI
)) {
438 bitmap_fill(vlan
->mc_filter
, MACVLAN_MC_FILTER_SZ
);
440 struct netdev_hw_addr
*ha
;
441 DECLARE_BITMAP(filter
, MACVLAN_MC_FILTER_SZ
);
443 bitmap_zero(filter
, MACVLAN_MC_FILTER_SZ
);
444 netdev_for_each_mc_addr(ha
, dev
) {
445 __set_bit(mc_hash(vlan
, ha
->addr
), filter
);
448 __set_bit(mc_hash(vlan
, dev
->broadcast
), filter
);
450 bitmap_copy(vlan
->mc_filter
, filter
, MACVLAN_MC_FILTER_SZ
);
452 dev_uc_sync(vlan
->lowerdev
, dev
);
453 dev_mc_sync(vlan
->lowerdev
, dev
);
456 static int macvlan_change_mtu(struct net_device
*dev
, int new_mtu
)
458 struct macvlan_dev
*vlan
= netdev_priv(dev
);
460 if (new_mtu
< 68 || vlan
->lowerdev
->mtu
< new_mtu
)
467 * macvlan network devices have devices nesting below it and are a special
468 * "super class" of normal network devices; split their locks off into a
469 * separate class since they always nest.
471 static struct lock_class_key macvlan_netdev_xmit_lock_key
;
472 static struct lock_class_key macvlan_netdev_addr_lock_key
;
474 #define MACVLAN_FEATURES \
475 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
476 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
477 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
478 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
480 #define MACVLAN_STATE_MASK \
481 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
483 static void macvlan_set_lockdep_class_one(struct net_device
*dev
,
484 struct netdev_queue
*txq
,
487 lockdep_set_class(&txq
->_xmit_lock
,
488 &macvlan_netdev_xmit_lock_key
);
491 static void macvlan_set_lockdep_class(struct net_device
*dev
)
493 lockdep_set_class(&dev
->addr_list_lock
,
494 &macvlan_netdev_addr_lock_key
);
495 netdev_for_each_tx_queue(dev
, macvlan_set_lockdep_class_one
, NULL
);
498 static int macvlan_init(struct net_device
*dev
)
500 struct macvlan_dev
*vlan
= netdev_priv(dev
);
501 const struct net_device
*lowerdev
= vlan
->lowerdev
;
503 dev
->state
= (dev
->state
& ~MACVLAN_STATE_MASK
) |
504 (lowerdev
->state
& MACVLAN_STATE_MASK
);
505 dev
->features
= lowerdev
->features
& MACVLAN_FEATURES
;
506 dev
->features
|= NETIF_F_LLTX
;
507 dev
->gso_max_size
= lowerdev
->gso_max_size
;
508 dev
->iflink
= lowerdev
->ifindex
;
509 dev
->hard_header_len
= lowerdev
->hard_header_len
;
511 macvlan_set_lockdep_class(dev
);
513 vlan
->pcpu_stats
= alloc_percpu(struct macvlan_pcpu_stats
);
514 if (!vlan
->pcpu_stats
)
520 static void macvlan_uninit(struct net_device
*dev
)
522 struct macvlan_dev
*vlan
= netdev_priv(dev
);
523 struct macvlan_port
*port
= vlan
->port
;
525 free_percpu(vlan
->pcpu_stats
);
529 macvlan_port_destroy(port
->dev
);
532 static struct rtnl_link_stats64
*macvlan_dev_get_stats64(struct net_device
*dev
,
533 struct rtnl_link_stats64
*stats
)
535 struct macvlan_dev
*vlan
= netdev_priv(dev
);
537 if (vlan
->pcpu_stats
) {
538 struct macvlan_pcpu_stats
*p
;
539 u64 rx_packets
, rx_bytes
, rx_multicast
, tx_packets
, tx_bytes
;
540 u32 rx_errors
= 0, tx_dropped
= 0;
544 for_each_possible_cpu(i
) {
545 p
= per_cpu_ptr(vlan
->pcpu_stats
, i
);
547 start
= u64_stats_fetch_begin_bh(&p
->syncp
);
548 rx_packets
= p
->rx_packets
;
549 rx_bytes
= p
->rx_bytes
;
550 rx_multicast
= p
->rx_multicast
;
551 tx_packets
= p
->tx_packets
;
552 tx_bytes
= p
->tx_bytes
;
553 } while (u64_stats_fetch_retry_bh(&p
->syncp
, start
));
555 stats
->rx_packets
+= rx_packets
;
556 stats
->rx_bytes
+= rx_bytes
;
557 stats
->multicast
+= rx_multicast
;
558 stats
->tx_packets
+= tx_packets
;
559 stats
->tx_bytes
+= tx_bytes
;
560 /* rx_errors & tx_dropped are u32, updated
561 * without syncp protection.
563 rx_errors
+= p
->rx_errors
;
564 tx_dropped
+= p
->tx_dropped
;
566 stats
->rx_errors
= rx_errors
;
567 stats
->rx_dropped
= rx_errors
;
568 stats
->tx_dropped
= tx_dropped
;
573 static int macvlan_vlan_rx_add_vid(struct net_device
*dev
,
574 __be16 proto
, u16 vid
)
576 struct macvlan_dev
*vlan
= netdev_priv(dev
);
577 struct net_device
*lowerdev
= vlan
->lowerdev
;
579 return vlan_vid_add(lowerdev
, proto
, vid
);
582 static int macvlan_vlan_rx_kill_vid(struct net_device
*dev
,
583 __be16 proto
, u16 vid
)
585 struct macvlan_dev
*vlan
= netdev_priv(dev
);
586 struct net_device
*lowerdev
= vlan
->lowerdev
;
588 vlan_vid_del(lowerdev
, proto
, vid
);
592 static int macvlan_fdb_add(struct ndmsg
*ndm
, struct nlattr
*tb
[],
593 struct net_device
*dev
,
594 const unsigned char *addr
,
597 struct macvlan_dev
*vlan
= netdev_priv(dev
);
600 if (!vlan
->port
->passthru
)
603 if (is_unicast_ether_addr(addr
))
604 err
= dev_uc_add_excl(dev
, addr
);
605 else if (is_multicast_ether_addr(addr
))
606 err
= dev_mc_add_excl(dev
, addr
);
611 static int macvlan_fdb_del(struct ndmsg
*ndm
, struct nlattr
*tb
[],
612 struct net_device
*dev
,
613 const unsigned char *addr
)
615 struct macvlan_dev
*vlan
= netdev_priv(dev
);
618 if (!vlan
->port
->passthru
)
621 if (is_unicast_ether_addr(addr
))
622 err
= dev_uc_del(dev
, addr
);
623 else if (is_multicast_ether_addr(addr
))
624 err
= dev_mc_del(dev
, addr
);
629 static void macvlan_ethtool_get_drvinfo(struct net_device
*dev
,
630 struct ethtool_drvinfo
*drvinfo
)
632 strlcpy(drvinfo
->driver
, "macvlan", sizeof(drvinfo
->driver
));
633 strlcpy(drvinfo
->version
, "0.1", sizeof(drvinfo
->version
));
636 static int macvlan_ethtool_get_settings(struct net_device
*dev
,
637 struct ethtool_cmd
*cmd
)
639 const struct macvlan_dev
*vlan
= netdev_priv(dev
);
641 return __ethtool_get_settings(vlan
->lowerdev
, cmd
);
644 static netdev_features_t
macvlan_fix_features(struct net_device
*dev
,
645 netdev_features_t features
)
647 struct macvlan_dev
*vlan
= netdev_priv(dev
);
649 return features
& (vlan
->set_features
| ~MACVLAN_FEATURES
);
652 static const struct ethtool_ops macvlan_ethtool_ops
= {
653 .get_link
= ethtool_op_get_link
,
654 .get_settings
= macvlan_ethtool_get_settings
,
655 .get_drvinfo
= macvlan_ethtool_get_drvinfo
,
658 static const struct net_device_ops macvlan_netdev_ops
= {
659 .ndo_init
= macvlan_init
,
660 .ndo_uninit
= macvlan_uninit
,
661 .ndo_open
= macvlan_open
,
662 .ndo_stop
= macvlan_stop
,
663 .ndo_start_xmit
= macvlan_start_xmit
,
664 .ndo_change_mtu
= macvlan_change_mtu
,
665 .ndo_fix_features
= macvlan_fix_features
,
666 .ndo_change_rx_flags
= macvlan_change_rx_flags
,
667 .ndo_set_mac_address
= macvlan_set_mac_address
,
668 .ndo_set_rx_mode
= macvlan_set_mac_lists
,
669 .ndo_get_stats64
= macvlan_dev_get_stats64
,
670 .ndo_validate_addr
= eth_validate_addr
,
671 .ndo_vlan_rx_add_vid
= macvlan_vlan_rx_add_vid
,
672 .ndo_vlan_rx_kill_vid
= macvlan_vlan_rx_kill_vid
,
673 .ndo_fdb_add
= macvlan_fdb_add
,
674 .ndo_fdb_del
= macvlan_fdb_del
,
675 .ndo_fdb_dump
= ndo_dflt_fdb_dump
,
678 void macvlan_common_setup(struct net_device
*dev
)
682 dev
->priv_flags
&= ~(IFF_XMIT_DST_RELEASE
| IFF_TX_SKB_SHARING
);
683 dev
->priv_flags
|= IFF_UNICAST_FLT
;
684 dev
->netdev_ops
= &macvlan_netdev_ops
;
685 dev
->destructor
= free_netdev
;
686 dev
->header_ops
= &macvlan_hard_header_ops
,
687 dev
->ethtool_ops
= &macvlan_ethtool_ops
;
689 EXPORT_SYMBOL_GPL(macvlan_common_setup
);
691 static void macvlan_setup(struct net_device
*dev
)
693 macvlan_common_setup(dev
);
694 dev
->tx_queue_len
= 0;
697 static int macvlan_port_create(struct net_device
*dev
)
699 struct macvlan_port
*port
;
703 if (dev
->type
!= ARPHRD_ETHER
|| dev
->flags
& IFF_LOOPBACK
)
706 port
= kzalloc(sizeof(*port
), GFP_KERNEL
);
710 port
->passthru
= false;
712 INIT_LIST_HEAD(&port
->vlans
);
713 for (i
= 0; i
< MACVLAN_HASH_SIZE
; i
++)
714 INIT_HLIST_HEAD(&port
->vlan_hash
[i
]);
716 err
= netdev_rx_handler_register(dev
, macvlan_handle_frame
, port
);
720 dev
->priv_flags
|= IFF_MACVLAN_PORT
;
724 static void macvlan_port_destroy(struct net_device
*dev
)
726 struct macvlan_port
*port
= macvlan_port_get_rtnl(dev
);
728 dev
->priv_flags
&= ~IFF_MACVLAN_PORT
;
729 netdev_rx_handler_unregister(dev
);
730 kfree_rcu(port
, rcu
);
733 static int macvlan_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
735 if (tb
[IFLA_ADDRESS
]) {
736 if (nla_len(tb
[IFLA_ADDRESS
]) != ETH_ALEN
)
738 if (!is_valid_ether_addr(nla_data(tb
[IFLA_ADDRESS
])))
739 return -EADDRNOTAVAIL
;
742 if (data
&& data
[IFLA_MACVLAN_FLAGS
] &&
743 nla_get_u16(data
[IFLA_MACVLAN_FLAGS
]) & ~MACVLAN_FLAG_NOPROMISC
)
746 if (data
&& data
[IFLA_MACVLAN_MODE
]) {
747 switch (nla_get_u32(data
[IFLA_MACVLAN_MODE
])) {
748 case MACVLAN_MODE_PRIVATE
:
749 case MACVLAN_MODE_VEPA
:
750 case MACVLAN_MODE_BRIDGE
:
751 case MACVLAN_MODE_PASSTHRU
:
760 int macvlan_common_newlink(struct net
*src_net
, struct net_device
*dev
,
761 struct nlattr
*tb
[], struct nlattr
*data
[],
762 int (*receive
)(struct sk_buff
*skb
),
763 int (*forward
)(struct net_device
*dev
,
764 struct sk_buff
*skb
))
766 struct macvlan_dev
*vlan
= netdev_priv(dev
);
767 struct macvlan_port
*port
;
768 struct net_device
*lowerdev
;
774 lowerdev
= __dev_get_by_index(src_net
, nla_get_u32(tb
[IFLA_LINK
]));
775 if (lowerdev
== NULL
)
778 /* When creating macvlans on top of other macvlans - use
779 * the real device as the lowerdev.
781 if (lowerdev
->rtnl_link_ops
== dev
->rtnl_link_ops
) {
782 struct macvlan_dev
*lowervlan
= netdev_priv(lowerdev
);
783 lowerdev
= lowervlan
->lowerdev
;
787 dev
->mtu
= lowerdev
->mtu
;
788 else if (dev
->mtu
> lowerdev
->mtu
)
791 if (!tb
[IFLA_ADDRESS
])
792 eth_hw_addr_random(dev
);
794 if (!macvlan_port_exists(lowerdev
)) {
795 err
= macvlan_port_create(lowerdev
);
799 port
= macvlan_port_get_rtnl(lowerdev
);
801 /* Only 1 macvlan device can be created in passthru mode */
805 vlan
->lowerdev
= lowerdev
;
808 vlan
->receive
= receive
;
809 vlan
->forward
= forward
;
810 vlan
->set_features
= MACVLAN_FEATURES
;
812 vlan
->mode
= MACVLAN_MODE_VEPA
;
813 if (data
&& data
[IFLA_MACVLAN_MODE
])
814 vlan
->mode
= nla_get_u32(data
[IFLA_MACVLAN_MODE
]);
816 if (data
&& data
[IFLA_MACVLAN_FLAGS
])
817 vlan
->flags
= nla_get_u16(data
[IFLA_MACVLAN_FLAGS
]);
819 if (vlan
->mode
== MACVLAN_MODE_PASSTHRU
) {
822 port
->passthru
= true;
823 memcpy(dev
->dev_addr
, lowerdev
->dev_addr
, ETH_ALEN
);
826 err
= netdev_upper_dev_link(lowerdev
, dev
);
831 err
= register_netdevice(dev
);
833 goto upper_dev_unlink
;
835 list_add_tail_rcu(&vlan
->list
, &port
->vlans
);
836 netif_stacked_transfer_operstate(lowerdev
, dev
);
841 netdev_upper_dev_unlink(lowerdev
, dev
);
845 macvlan_port_destroy(lowerdev
);
849 EXPORT_SYMBOL_GPL(macvlan_common_newlink
);
851 static int macvlan_newlink(struct net
*src_net
, struct net_device
*dev
,
852 struct nlattr
*tb
[], struct nlattr
*data
[])
854 return macvlan_common_newlink(src_net
, dev
, tb
, data
,
859 void macvlan_dellink(struct net_device
*dev
, struct list_head
*head
)
861 struct macvlan_dev
*vlan
= netdev_priv(dev
);
863 list_del_rcu(&vlan
->list
);
864 unregister_netdevice_queue(dev
, head
);
865 netdev_upper_dev_unlink(vlan
->lowerdev
, dev
);
867 EXPORT_SYMBOL_GPL(macvlan_dellink
);
869 static int macvlan_changelink(struct net_device
*dev
,
870 struct nlattr
*tb
[], struct nlattr
*data
[])
872 struct macvlan_dev
*vlan
= netdev_priv(dev
);
873 enum macvlan_mode mode
;
874 bool set_mode
= false;
876 /* Validate mode, but don't set yet: setting flags may fail. */
877 if (data
&& data
[IFLA_MACVLAN_MODE
]) {
879 mode
= nla_get_u32(data
[IFLA_MACVLAN_MODE
]);
880 /* Passthrough mode can't be set or cleared dynamically */
881 if ((mode
== MACVLAN_MODE_PASSTHRU
) !=
882 (vlan
->mode
== MACVLAN_MODE_PASSTHRU
))
886 if (data
&& data
[IFLA_MACVLAN_FLAGS
]) {
887 __u16 flags
= nla_get_u16(data
[IFLA_MACVLAN_FLAGS
]);
888 bool promisc
= (flags
^ vlan
->flags
) & MACVLAN_FLAG_NOPROMISC
;
889 if (vlan
->port
->passthru
&& promisc
) {
892 if (flags
& MACVLAN_FLAG_NOPROMISC
)
893 err
= dev_set_promiscuity(vlan
->lowerdev
, -1);
895 err
= dev_set_promiscuity(vlan
->lowerdev
, 1);
906 static size_t macvlan_get_size(const struct net_device
*dev
)
909 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
910 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
914 static int macvlan_fill_info(struct sk_buff
*skb
,
915 const struct net_device
*dev
)
917 struct macvlan_dev
*vlan
= netdev_priv(dev
);
919 if (nla_put_u32(skb
, IFLA_MACVLAN_MODE
, vlan
->mode
))
920 goto nla_put_failure
;
921 if (nla_put_u16(skb
, IFLA_MACVLAN_FLAGS
, vlan
->flags
))
922 goto nla_put_failure
;
929 static const struct nla_policy macvlan_policy
[IFLA_MACVLAN_MAX
+ 1] = {
930 [IFLA_MACVLAN_MODE
] = { .type
= NLA_U32
},
931 [IFLA_MACVLAN_FLAGS
] = { .type
= NLA_U16
},
934 int macvlan_link_register(struct rtnl_link_ops
*ops
)
937 ops
->priv_size
= sizeof(struct macvlan_dev
);
938 ops
->validate
= macvlan_validate
;
939 ops
->maxtype
= IFLA_MACVLAN_MAX
;
940 ops
->policy
= macvlan_policy
;
941 ops
->changelink
= macvlan_changelink
;
942 ops
->get_size
= macvlan_get_size
;
943 ops
->fill_info
= macvlan_fill_info
;
945 return rtnl_link_register(ops
);
947 EXPORT_SYMBOL_GPL(macvlan_link_register
);
949 static struct rtnl_link_ops macvlan_link_ops
= {
951 .setup
= macvlan_setup
,
952 .newlink
= macvlan_newlink
,
953 .dellink
= macvlan_dellink
,
956 static int macvlan_device_event(struct notifier_block
*unused
,
957 unsigned long event
, void *ptr
)
959 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
960 struct macvlan_dev
*vlan
, *next
;
961 struct macvlan_port
*port
;
962 LIST_HEAD(list_kill
);
964 if (!macvlan_port_exists(dev
))
967 port
= macvlan_port_get_rtnl(dev
);
971 list_for_each_entry(vlan
, &port
->vlans
, list
)
972 netif_stacked_transfer_operstate(vlan
->lowerdev
,
975 case NETDEV_FEAT_CHANGE
:
976 list_for_each_entry(vlan
, &port
->vlans
, list
) {
977 vlan
->dev
->features
= dev
->features
& MACVLAN_FEATURES
;
978 vlan
->dev
->gso_max_size
= dev
->gso_max_size
;
979 netdev_features_change(vlan
->dev
);
982 case NETDEV_UNREGISTER
:
983 /* twiddle thumbs on netns device moves */
984 if (dev
->reg_state
!= NETREG_UNREGISTERING
)
987 list_for_each_entry_safe(vlan
, next
, &port
->vlans
, list
)
988 vlan
->dev
->rtnl_link_ops
->dellink(vlan
->dev
, &list_kill
);
989 unregister_netdevice_many(&list_kill
);
990 list_del(&list_kill
);
992 case NETDEV_PRE_TYPE_CHANGE
:
993 /* Forbid underlaying device to change its type. */
999 static struct notifier_block macvlan_notifier_block __read_mostly
= {
1000 .notifier_call
= macvlan_device_event
,
1003 static int __init
macvlan_init_module(void)
1007 register_netdevice_notifier(&macvlan_notifier_block
);
1009 err
= macvlan_link_register(&macvlan_link_ops
);
1014 unregister_netdevice_notifier(&macvlan_notifier_block
);
1018 static void __exit
macvlan_cleanup_module(void)
1020 rtnl_link_unregister(&macvlan_link_ops
);
1021 unregister_netdevice_notifier(&macvlan_notifier_block
);
1024 module_init(macvlan_init_module
);
1025 module_exit(macvlan_cleanup_module
);
1027 MODULE_LICENSE("GPL");
1028 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1029 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1030 MODULE_ALIAS_RTNL_LINK("macvlan");