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
;
123 return vlan
->forward(dev
, skb
);
126 if (ether_addr_equal_64bits(eth
->h_dest
, dev
->broadcast
))
127 skb
->pkt_type
= PACKET_BROADCAST
;
129 skb
->pkt_type
= PACKET_MULTICAST
;
131 return vlan
->receive(skb
);
134 static u32
macvlan_hash_mix(const struct macvlan_dev
*vlan
)
136 return (u32
)(((unsigned long)vlan
) >> L1_CACHE_SHIFT
);
140 static unsigned int mc_hash(const struct macvlan_dev
*vlan
,
141 const unsigned char *addr
)
143 u32 val
= __get_unaligned_cpu32(addr
+ 2);
145 val
^= macvlan_hash_mix(vlan
);
146 return hash_32(val
, MACVLAN_MC_FILTER_BITS
);
149 static void macvlan_broadcast(struct sk_buff
*skb
,
150 const struct macvlan_port
*port
,
151 struct net_device
*src
,
152 enum macvlan_mode mode
)
154 const struct ethhdr
*eth
= eth_hdr(skb
);
155 const struct macvlan_dev
*vlan
;
156 struct sk_buff
*nskb
;
161 if (skb
->protocol
== htons(ETH_P_PAUSE
))
164 for (i
= 0; i
< MACVLAN_HASH_SIZE
; i
++) {
165 hlist_for_each_entry_rcu(vlan
, &port
->vlan_hash
[i
], hlist
) {
166 if (vlan
->dev
== src
|| !(vlan
->mode
& mode
))
169 hash
= mc_hash(vlan
, eth
->h_dest
);
170 if (!test_bit(hash
, vlan
->mc_filter
))
174 nskb
= skb_clone(skb
, GFP_ATOMIC
);
176 err
= macvlan_broadcast_one(
178 mode
== MACVLAN_MODE_BRIDGE
);
179 macvlan_count_rx(vlan
, skb
->len
+ ETH_HLEN
,
180 err
== NET_RX_SUCCESS
, 1);
185 /* called under rcu_read_lock() from netif_receive_skb */
186 static rx_handler_result_t
macvlan_handle_frame(struct sk_buff
**pskb
)
188 struct macvlan_port
*port
;
189 struct sk_buff
*skb
= *pskb
;
190 const struct ethhdr
*eth
= eth_hdr(skb
);
191 const struct macvlan_dev
*vlan
;
192 const struct macvlan_dev
*src
;
193 struct net_device
*dev
;
194 unsigned int len
= 0;
195 int ret
= NET_RX_DROP
;
197 port
= macvlan_port_get_rcu(skb
->dev
);
198 if (is_multicast_ether_addr(eth
->h_dest
)) {
199 skb
= ip_check_defrag(skb
, IP_DEFRAG_MACVLAN
);
201 return RX_HANDLER_CONSUMED
;
203 src
= macvlan_hash_lookup(port
, eth
->h_source
);
205 /* frame comes from an external address */
206 macvlan_broadcast(skb
, port
, NULL
,
207 MACVLAN_MODE_PRIVATE
|
209 MACVLAN_MODE_PASSTHRU
|
210 MACVLAN_MODE_BRIDGE
);
211 else if (src
->mode
== MACVLAN_MODE_VEPA
)
212 /* flood to everyone except source */
213 macvlan_broadcast(skb
, port
, src
->dev
,
215 MACVLAN_MODE_BRIDGE
);
216 else if (src
->mode
== MACVLAN_MODE_BRIDGE
)
218 * flood only to VEPA ports, bridge ports
219 * already saw the frame on the way out.
221 macvlan_broadcast(skb
, port
, src
->dev
,
224 /* forward to original port. */
226 ret
= macvlan_broadcast_one(skb
, vlan
, eth
, 0);
230 return RX_HANDLER_PASS
;
234 vlan
= list_first_or_null_rcu(&port
->vlans
,
235 struct macvlan_dev
, list
);
237 vlan
= macvlan_hash_lookup(port
, eth
->h_dest
);
239 return RX_HANDLER_PASS
;
242 if (unlikely(!(dev
->flags
& IFF_UP
))) {
244 return RX_HANDLER_CONSUMED
;
246 len
= skb
->len
+ ETH_HLEN
;
247 skb
= skb_share_check(skb
, GFP_ATOMIC
);
252 skb
->pkt_type
= PACKET_HOST
;
254 ret
= vlan
->receive(skb
);
257 macvlan_count_rx(vlan
, len
, ret
== NET_RX_SUCCESS
, 0);
258 return RX_HANDLER_CONSUMED
;
261 static int macvlan_queue_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
263 const struct macvlan_dev
*vlan
= netdev_priv(dev
);
264 const struct macvlan_port
*port
= vlan
->port
;
265 const struct macvlan_dev
*dest
;
266 __u8 ip_summed
= skb
->ip_summed
;
268 if (vlan
->mode
== MACVLAN_MODE_BRIDGE
) {
269 const struct ethhdr
*eth
= (void *)skb
->data
;
270 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
272 /* send to other bridge ports directly */
273 if (is_multicast_ether_addr(eth
->h_dest
)) {
274 macvlan_broadcast(skb
, port
, dev
, MACVLAN_MODE_BRIDGE
);
278 dest
= macvlan_hash_lookup(port
, eth
->h_dest
);
279 if (dest
&& dest
->mode
== MACVLAN_MODE_BRIDGE
) {
280 /* send to lowerdev first for its network taps */
281 dev_forward_skb(vlan
->lowerdev
, skb
);
283 return NET_XMIT_SUCCESS
;
288 skb
->ip_summed
= ip_summed
;
289 skb
->dev
= vlan
->lowerdev
;
290 return dev_queue_xmit(skb
);
293 netdev_tx_t
macvlan_start_xmit(struct sk_buff
*skb
,
294 struct net_device
*dev
)
296 unsigned int len
= skb
->len
;
298 const struct macvlan_dev
*vlan
= netdev_priv(dev
);
300 ret
= macvlan_queue_xmit(skb
, dev
);
301 if (likely(ret
== NET_XMIT_SUCCESS
|| ret
== NET_XMIT_CN
)) {
302 struct macvlan_pcpu_stats
*pcpu_stats
;
304 pcpu_stats
= this_cpu_ptr(vlan
->pcpu_stats
);
305 u64_stats_update_begin(&pcpu_stats
->syncp
);
306 pcpu_stats
->tx_packets
++;
307 pcpu_stats
->tx_bytes
+= len
;
308 u64_stats_update_end(&pcpu_stats
->syncp
);
310 this_cpu_inc(vlan
->pcpu_stats
->tx_dropped
);
314 EXPORT_SYMBOL_GPL(macvlan_start_xmit
);
316 static int macvlan_hard_header(struct sk_buff
*skb
, struct net_device
*dev
,
317 unsigned short type
, const void *daddr
,
318 const void *saddr
, unsigned len
)
320 const struct macvlan_dev
*vlan
= netdev_priv(dev
);
321 struct net_device
*lowerdev
= vlan
->lowerdev
;
323 return dev_hard_header(skb
, lowerdev
, type
, daddr
,
324 saddr
? : dev
->dev_addr
, len
);
327 static const struct header_ops macvlan_hard_header_ops
= {
328 .create
= macvlan_hard_header
,
329 .rebuild
= eth_rebuild_header
,
330 .parse
= eth_header_parse
,
331 .cache
= eth_header_cache
,
332 .cache_update
= eth_header_cache_update
,
335 static int macvlan_open(struct net_device
*dev
)
337 struct macvlan_dev
*vlan
= netdev_priv(dev
);
338 struct net_device
*lowerdev
= vlan
->lowerdev
;
341 if (vlan
->port
->passthru
) {
342 if (!(vlan
->flags
& MACVLAN_FLAG_NOPROMISC
)) {
343 err
= dev_set_promiscuity(lowerdev
, 1);
351 if (macvlan_addr_busy(vlan
->port
, dev
->dev_addr
))
354 err
= dev_uc_add(lowerdev
, dev
->dev_addr
);
357 if (dev
->flags
& IFF_ALLMULTI
) {
358 err
= dev_set_allmulti(lowerdev
, 1);
364 macvlan_hash_add(vlan
);
368 dev_uc_del(lowerdev
, dev
->dev_addr
);
373 static int macvlan_stop(struct net_device
*dev
)
375 struct macvlan_dev
*vlan
= netdev_priv(dev
);
376 struct net_device
*lowerdev
= vlan
->lowerdev
;
378 dev_uc_unsync(lowerdev
, dev
);
379 dev_mc_unsync(lowerdev
, dev
);
381 if (vlan
->port
->passthru
) {
382 if (!(vlan
->flags
& MACVLAN_FLAG_NOPROMISC
))
383 dev_set_promiscuity(lowerdev
, -1);
387 if (dev
->flags
& IFF_ALLMULTI
)
388 dev_set_allmulti(lowerdev
, -1);
390 dev_uc_del(lowerdev
, dev
->dev_addr
);
393 macvlan_hash_del(vlan
, !dev
->dismantle
);
397 static int macvlan_set_mac_address(struct net_device
*dev
, void *p
)
399 struct macvlan_dev
*vlan
= netdev_priv(dev
);
400 struct net_device
*lowerdev
= vlan
->lowerdev
;
401 struct sockaddr
*addr
= p
;
404 if (!is_valid_ether_addr(addr
->sa_data
))
405 return -EADDRNOTAVAIL
;
407 if (!(dev
->flags
& IFF_UP
)) {
408 /* Just copy in the new address */
409 memcpy(dev
->dev_addr
, addr
->sa_data
, ETH_ALEN
);
411 /* Rehash and update the device filters */
412 if (macvlan_addr_busy(vlan
->port
, addr
->sa_data
))
415 err
= dev_uc_add(lowerdev
, addr
->sa_data
);
419 dev_uc_del(lowerdev
, dev
->dev_addr
);
421 macvlan_hash_change_addr(vlan
, addr
->sa_data
);
426 static void macvlan_change_rx_flags(struct net_device
*dev
, int change
)
428 struct macvlan_dev
*vlan
= netdev_priv(dev
);
429 struct net_device
*lowerdev
= vlan
->lowerdev
;
431 if (change
& IFF_ALLMULTI
)
432 dev_set_allmulti(lowerdev
, dev
->flags
& IFF_ALLMULTI
? 1 : -1);
435 static void macvlan_set_mac_lists(struct net_device
*dev
)
437 struct macvlan_dev
*vlan
= netdev_priv(dev
);
439 if (dev
->flags
& (IFF_PROMISC
| IFF_ALLMULTI
)) {
440 bitmap_fill(vlan
->mc_filter
, MACVLAN_MC_FILTER_SZ
);
442 struct netdev_hw_addr
*ha
;
443 DECLARE_BITMAP(filter
, MACVLAN_MC_FILTER_SZ
);
445 bitmap_zero(filter
, MACVLAN_MC_FILTER_SZ
);
446 netdev_for_each_mc_addr(ha
, dev
) {
447 __set_bit(mc_hash(vlan
, ha
->addr
), filter
);
450 __set_bit(mc_hash(vlan
, dev
->broadcast
), filter
);
452 bitmap_copy(vlan
->mc_filter
, filter
, MACVLAN_MC_FILTER_SZ
);
454 dev_uc_sync(vlan
->lowerdev
, dev
);
455 dev_mc_sync(vlan
->lowerdev
, dev
);
458 static int macvlan_change_mtu(struct net_device
*dev
, int new_mtu
)
460 struct macvlan_dev
*vlan
= netdev_priv(dev
);
462 if (new_mtu
< 68 || vlan
->lowerdev
->mtu
< new_mtu
)
469 * macvlan network devices have devices nesting below it and are a special
470 * "super class" of normal network devices; split their locks off into a
471 * separate class since they always nest.
473 static struct lock_class_key macvlan_netdev_xmit_lock_key
;
474 static struct lock_class_key macvlan_netdev_addr_lock_key
;
476 #define MACVLAN_FEATURES \
477 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
478 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
479 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
480 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
482 #define MACVLAN_STATE_MASK \
483 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
485 static void macvlan_set_lockdep_class_one(struct net_device
*dev
,
486 struct netdev_queue
*txq
,
489 lockdep_set_class(&txq
->_xmit_lock
,
490 &macvlan_netdev_xmit_lock_key
);
493 static void macvlan_set_lockdep_class(struct net_device
*dev
)
495 lockdep_set_class(&dev
->addr_list_lock
,
496 &macvlan_netdev_addr_lock_key
);
497 netdev_for_each_tx_queue(dev
, macvlan_set_lockdep_class_one
, NULL
);
500 static int macvlan_init(struct net_device
*dev
)
502 struct macvlan_dev
*vlan
= netdev_priv(dev
);
503 const struct net_device
*lowerdev
= vlan
->lowerdev
;
505 dev
->state
= (dev
->state
& ~MACVLAN_STATE_MASK
) |
506 (lowerdev
->state
& MACVLAN_STATE_MASK
);
507 dev
->features
= lowerdev
->features
& MACVLAN_FEATURES
;
508 dev
->features
|= NETIF_F_LLTX
;
509 dev
->gso_max_size
= lowerdev
->gso_max_size
;
510 dev
->iflink
= lowerdev
->ifindex
;
511 dev
->hard_header_len
= lowerdev
->hard_header_len
;
513 macvlan_set_lockdep_class(dev
);
515 vlan
->pcpu_stats
= alloc_percpu(struct macvlan_pcpu_stats
);
516 if (!vlan
->pcpu_stats
)
522 static void macvlan_uninit(struct net_device
*dev
)
524 struct macvlan_dev
*vlan
= netdev_priv(dev
);
525 struct macvlan_port
*port
= vlan
->port
;
527 free_percpu(vlan
->pcpu_stats
);
531 macvlan_port_destroy(port
->dev
);
534 static struct rtnl_link_stats64
*macvlan_dev_get_stats64(struct net_device
*dev
,
535 struct rtnl_link_stats64
*stats
)
537 struct macvlan_dev
*vlan
= netdev_priv(dev
);
539 if (vlan
->pcpu_stats
) {
540 struct macvlan_pcpu_stats
*p
;
541 u64 rx_packets
, rx_bytes
, rx_multicast
, tx_packets
, tx_bytes
;
542 u32 rx_errors
= 0, tx_dropped
= 0;
546 for_each_possible_cpu(i
) {
547 p
= per_cpu_ptr(vlan
->pcpu_stats
, i
);
549 start
= u64_stats_fetch_begin_bh(&p
->syncp
);
550 rx_packets
= p
->rx_packets
;
551 rx_bytes
= p
->rx_bytes
;
552 rx_multicast
= p
->rx_multicast
;
553 tx_packets
= p
->tx_packets
;
554 tx_bytes
= p
->tx_bytes
;
555 } while (u64_stats_fetch_retry_bh(&p
->syncp
, start
));
557 stats
->rx_packets
+= rx_packets
;
558 stats
->rx_bytes
+= rx_bytes
;
559 stats
->multicast
+= rx_multicast
;
560 stats
->tx_packets
+= tx_packets
;
561 stats
->tx_bytes
+= tx_bytes
;
562 /* rx_errors & tx_dropped are u32, updated
563 * without syncp protection.
565 rx_errors
+= p
->rx_errors
;
566 tx_dropped
+= p
->tx_dropped
;
568 stats
->rx_errors
= rx_errors
;
569 stats
->rx_dropped
= rx_errors
;
570 stats
->tx_dropped
= tx_dropped
;
575 static int macvlan_vlan_rx_add_vid(struct net_device
*dev
,
576 __be16 proto
, u16 vid
)
578 struct macvlan_dev
*vlan
= netdev_priv(dev
);
579 struct net_device
*lowerdev
= vlan
->lowerdev
;
581 return vlan_vid_add(lowerdev
, proto
, vid
);
584 static int macvlan_vlan_rx_kill_vid(struct net_device
*dev
,
585 __be16 proto
, u16 vid
)
587 struct macvlan_dev
*vlan
= netdev_priv(dev
);
588 struct net_device
*lowerdev
= vlan
->lowerdev
;
590 vlan_vid_del(lowerdev
, proto
, vid
);
594 static int macvlan_fdb_add(struct ndmsg
*ndm
, struct nlattr
*tb
[],
595 struct net_device
*dev
,
596 const unsigned char *addr
,
599 struct macvlan_dev
*vlan
= netdev_priv(dev
);
602 if (!vlan
->port
->passthru
)
605 if (flags
& NLM_F_REPLACE
)
608 if (is_unicast_ether_addr(addr
))
609 err
= dev_uc_add_excl(dev
, addr
);
610 else if (is_multicast_ether_addr(addr
))
611 err
= dev_mc_add_excl(dev
, addr
);
616 static int macvlan_fdb_del(struct ndmsg
*ndm
, struct nlattr
*tb
[],
617 struct net_device
*dev
,
618 const unsigned char *addr
)
620 struct macvlan_dev
*vlan
= netdev_priv(dev
);
623 if (!vlan
->port
->passthru
)
626 if (is_unicast_ether_addr(addr
))
627 err
= dev_uc_del(dev
, addr
);
628 else if (is_multicast_ether_addr(addr
))
629 err
= dev_mc_del(dev
, addr
);
634 static void macvlan_ethtool_get_drvinfo(struct net_device
*dev
,
635 struct ethtool_drvinfo
*drvinfo
)
637 strlcpy(drvinfo
->driver
, "macvlan", sizeof(drvinfo
->driver
));
638 strlcpy(drvinfo
->version
, "0.1", sizeof(drvinfo
->version
));
641 static int macvlan_ethtool_get_settings(struct net_device
*dev
,
642 struct ethtool_cmd
*cmd
)
644 const struct macvlan_dev
*vlan
= netdev_priv(dev
);
646 return __ethtool_get_settings(vlan
->lowerdev
, cmd
);
649 static netdev_features_t
macvlan_fix_features(struct net_device
*dev
,
650 netdev_features_t features
)
652 struct macvlan_dev
*vlan
= netdev_priv(dev
);
654 return features
& (vlan
->set_features
| ~MACVLAN_FEATURES
);
657 static const struct ethtool_ops macvlan_ethtool_ops
= {
658 .get_link
= ethtool_op_get_link
,
659 .get_settings
= macvlan_ethtool_get_settings
,
660 .get_drvinfo
= macvlan_ethtool_get_drvinfo
,
663 static const struct net_device_ops macvlan_netdev_ops
= {
664 .ndo_init
= macvlan_init
,
665 .ndo_uninit
= macvlan_uninit
,
666 .ndo_open
= macvlan_open
,
667 .ndo_stop
= macvlan_stop
,
668 .ndo_start_xmit
= macvlan_start_xmit
,
669 .ndo_change_mtu
= macvlan_change_mtu
,
670 .ndo_fix_features
= macvlan_fix_features
,
671 .ndo_change_rx_flags
= macvlan_change_rx_flags
,
672 .ndo_set_mac_address
= macvlan_set_mac_address
,
673 .ndo_set_rx_mode
= macvlan_set_mac_lists
,
674 .ndo_get_stats64
= macvlan_dev_get_stats64
,
675 .ndo_validate_addr
= eth_validate_addr
,
676 .ndo_vlan_rx_add_vid
= macvlan_vlan_rx_add_vid
,
677 .ndo_vlan_rx_kill_vid
= macvlan_vlan_rx_kill_vid
,
678 .ndo_fdb_add
= macvlan_fdb_add
,
679 .ndo_fdb_del
= macvlan_fdb_del
,
680 .ndo_fdb_dump
= ndo_dflt_fdb_dump
,
683 void macvlan_common_setup(struct net_device
*dev
)
687 dev
->priv_flags
&= ~(IFF_XMIT_DST_RELEASE
| IFF_TX_SKB_SHARING
);
688 dev
->priv_flags
|= IFF_UNICAST_FLT
;
689 dev
->netdev_ops
= &macvlan_netdev_ops
;
690 dev
->destructor
= free_netdev
;
691 dev
->header_ops
= &macvlan_hard_header_ops
;
692 dev
->ethtool_ops
= &macvlan_ethtool_ops
;
694 EXPORT_SYMBOL_GPL(macvlan_common_setup
);
696 static void macvlan_setup(struct net_device
*dev
)
698 macvlan_common_setup(dev
);
699 dev
->tx_queue_len
= 0;
702 static int macvlan_port_create(struct net_device
*dev
)
704 struct macvlan_port
*port
;
708 if (dev
->type
!= ARPHRD_ETHER
|| dev
->flags
& IFF_LOOPBACK
)
711 port
= kzalloc(sizeof(*port
), GFP_KERNEL
);
715 port
->passthru
= false;
717 INIT_LIST_HEAD(&port
->vlans
);
718 for (i
= 0; i
< MACVLAN_HASH_SIZE
; i
++)
719 INIT_HLIST_HEAD(&port
->vlan_hash
[i
]);
721 err
= netdev_rx_handler_register(dev
, macvlan_handle_frame
, port
);
725 dev
->priv_flags
|= IFF_MACVLAN_PORT
;
729 static void macvlan_port_destroy(struct net_device
*dev
)
731 struct macvlan_port
*port
= macvlan_port_get_rtnl(dev
);
733 dev
->priv_flags
&= ~IFF_MACVLAN_PORT
;
734 netdev_rx_handler_unregister(dev
);
735 kfree_rcu(port
, rcu
);
738 static int macvlan_validate(struct nlattr
*tb
[], struct nlattr
*data
[])
740 if (tb
[IFLA_ADDRESS
]) {
741 if (nla_len(tb
[IFLA_ADDRESS
]) != ETH_ALEN
)
743 if (!is_valid_ether_addr(nla_data(tb
[IFLA_ADDRESS
])))
744 return -EADDRNOTAVAIL
;
747 if (data
&& data
[IFLA_MACVLAN_FLAGS
] &&
748 nla_get_u16(data
[IFLA_MACVLAN_FLAGS
]) & ~MACVLAN_FLAG_NOPROMISC
)
751 if (data
&& data
[IFLA_MACVLAN_MODE
]) {
752 switch (nla_get_u32(data
[IFLA_MACVLAN_MODE
])) {
753 case MACVLAN_MODE_PRIVATE
:
754 case MACVLAN_MODE_VEPA
:
755 case MACVLAN_MODE_BRIDGE
:
756 case MACVLAN_MODE_PASSTHRU
:
765 int macvlan_common_newlink(struct net
*src_net
, struct net_device
*dev
,
766 struct nlattr
*tb
[], struct nlattr
*data
[],
767 int (*receive
)(struct sk_buff
*skb
),
768 int (*forward
)(struct net_device
*dev
,
769 struct sk_buff
*skb
))
771 struct macvlan_dev
*vlan
= netdev_priv(dev
);
772 struct macvlan_port
*port
;
773 struct net_device
*lowerdev
;
779 lowerdev
= __dev_get_by_index(src_net
, nla_get_u32(tb
[IFLA_LINK
]));
780 if (lowerdev
== NULL
)
783 /* When creating macvlans on top of other macvlans - use
784 * the real device as the lowerdev.
786 if (lowerdev
->rtnl_link_ops
== dev
->rtnl_link_ops
) {
787 struct macvlan_dev
*lowervlan
= netdev_priv(lowerdev
);
788 lowerdev
= lowervlan
->lowerdev
;
792 dev
->mtu
= lowerdev
->mtu
;
793 else if (dev
->mtu
> lowerdev
->mtu
)
796 if (!tb
[IFLA_ADDRESS
])
797 eth_hw_addr_random(dev
);
799 if (!macvlan_port_exists(lowerdev
)) {
800 err
= macvlan_port_create(lowerdev
);
804 port
= macvlan_port_get_rtnl(lowerdev
);
806 /* Only 1 macvlan device can be created in passthru mode */
810 vlan
->lowerdev
= lowerdev
;
813 vlan
->receive
= receive
;
814 vlan
->forward
= forward
;
815 vlan
->set_features
= MACVLAN_FEATURES
;
817 vlan
->mode
= MACVLAN_MODE_VEPA
;
818 if (data
&& data
[IFLA_MACVLAN_MODE
])
819 vlan
->mode
= nla_get_u32(data
[IFLA_MACVLAN_MODE
]);
821 if (data
&& data
[IFLA_MACVLAN_FLAGS
])
822 vlan
->flags
= nla_get_u16(data
[IFLA_MACVLAN_FLAGS
]);
824 if (vlan
->mode
== MACVLAN_MODE_PASSTHRU
) {
827 port
->passthru
= true;
828 eth_hw_addr_inherit(dev
, lowerdev
);
832 err
= register_netdevice(dev
);
836 err
= netdev_upper_dev_link(lowerdev
, dev
);
841 list_add_tail_rcu(&vlan
->list
, &port
->vlans
);
842 netif_stacked_transfer_operstate(lowerdev
, dev
);
849 macvlan_port_destroy(lowerdev
);
853 EXPORT_SYMBOL_GPL(macvlan_common_newlink
);
855 static int macvlan_newlink(struct net
*src_net
, struct net_device
*dev
,
856 struct nlattr
*tb
[], struct nlattr
*data
[])
858 return macvlan_common_newlink(src_net
, dev
, tb
, data
,
863 void macvlan_dellink(struct net_device
*dev
, struct list_head
*head
)
865 struct macvlan_dev
*vlan
= netdev_priv(dev
);
867 list_del_rcu(&vlan
->list
);
868 unregister_netdevice_queue(dev
, head
);
869 netdev_upper_dev_unlink(vlan
->lowerdev
, dev
);
871 EXPORT_SYMBOL_GPL(macvlan_dellink
);
873 static int macvlan_changelink(struct net_device
*dev
,
874 struct nlattr
*tb
[], struct nlattr
*data
[])
876 struct macvlan_dev
*vlan
= netdev_priv(dev
);
877 enum macvlan_mode mode
;
878 bool set_mode
= false;
880 /* Validate mode, but don't set yet: setting flags may fail. */
881 if (data
&& data
[IFLA_MACVLAN_MODE
]) {
883 mode
= nla_get_u32(data
[IFLA_MACVLAN_MODE
]);
884 /* Passthrough mode can't be set or cleared dynamically */
885 if ((mode
== MACVLAN_MODE_PASSTHRU
) !=
886 (vlan
->mode
== MACVLAN_MODE_PASSTHRU
))
890 if (data
&& data
[IFLA_MACVLAN_FLAGS
]) {
891 __u16 flags
= nla_get_u16(data
[IFLA_MACVLAN_FLAGS
]);
892 bool promisc
= (flags
^ vlan
->flags
) & MACVLAN_FLAG_NOPROMISC
;
893 if (vlan
->port
->passthru
&& promisc
) {
896 if (flags
& MACVLAN_FLAG_NOPROMISC
)
897 err
= dev_set_promiscuity(vlan
->lowerdev
, -1);
899 err
= dev_set_promiscuity(vlan
->lowerdev
, 1);
910 static size_t macvlan_get_size(const struct net_device
*dev
)
913 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
914 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
918 static int macvlan_fill_info(struct sk_buff
*skb
,
919 const struct net_device
*dev
)
921 struct macvlan_dev
*vlan
= netdev_priv(dev
);
923 if (nla_put_u32(skb
, IFLA_MACVLAN_MODE
, vlan
->mode
))
924 goto nla_put_failure
;
925 if (nla_put_u16(skb
, IFLA_MACVLAN_FLAGS
, vlan
->flags
))
926 goto nla_put_failure
;
933 static const struct nla_policy macvlan_policy
[IFLA_MACVLAN_MAX
+ 1] = {
934 [IFLA_MACVLAN_MODE
] = { .type
= NLA_U32
},
935 [IFLA_MACVLAN_FLAGS
] = { .type
= NLA_U16
},
938 int macvlan_link_register(struct rtnl_link_ops
*ops
)
941 ops
->priv_size
= sizeof(struct macvlan_dev
);
942 ops
->validate
= macvlan_validate
;
943 ops
->maxtype
= IFLA_MACVLAN_MAX
;
944 ops
->policy
= macvlan_policy
;
945 ops
->changelink
= macvlan_changelink
;
946 ops
->get_size
= macvlan_get_size
;
947 ops
->fill_info
= macvlan_fill_info
;
949 return rtnl_link_register(ops
);
951 EXPORT_SYMBOL_GPL(macvlan_link_register
);
953 static struct rtnl_link_ops macvlan_link_ops
= {
955 .setup
= macvlan_setup
,
956 .newlink
= macvlan_newlink
,
957 .dellink
= macvlan_dellink
,
960 static int macvlan_device_event(struct notifier_block
*unused
,
961 unsigned long event
, void *ptr
)
963 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
964 struct macvlan_dev
*vlan
, *next
;
965 struct macvlan_port
*port
;
966 LIST_HEAD(list_kill
);
968 if (!macvlan_port_exists(dev
))
971 port
= macvlan_port_get_rtnl(dev
);
975 list_for_each_entry(vlan
, &port
->vlans
, list
)
976 netif_stacked_transfer_operstate(vlan
->lowerdev
,
979 case NETDEV_FEAT_CHANGE
:
980 list_for_each_entry(vlan
, &port
->vlans
, list
) {
981 vlan
->dev
->features
= dev
->features
& MACVLAN_FEATURES
;
982 vlan
->dev
->gso_max_size
= dev
->gso_max_size
;
983 netdev_features_change(vlan
->dev
);
986 case NETDEV_UNREGISTER
:
987 /* twiddle thumbs on netns device moves */
988 if (dev
->reg_state
!= NETREG_UNREGISTERING
)
991 list_for_each_entry_safe(vlan
, next
, &port
->vlans
, list
)
992 vlan
->dev
->rtnl_link_ops
->dellink(vlan
->dev
, &list_kill
);
993 unregister_netdevice_many(&list_kill
);
994 list_del(&list_kill
);
996 case NETDEV_PRE_TYPE_CHANGE
:
997 /* Forbid underlaying device to change its type. */
1003 static struct notifier_block macvlan_notifier_block __read_mostly
= {
1004 .notifier_call
= macvlan_device_event
,
1007 static int __init
macvlan_init_module(void)
1011 register_netdevice_notifier(&macvlan_notifier_block
);
1013 err
= macvlan_link_register(&macvlan_link_ops
);
1018 unregister_netdevice_notifier(&macvlan_notifier_block
);
1022 static void __exit
macvlan_cleanup_module(void)
1024 rtnl_link_unregister(&macvlan_link_ops
);
1025 unregister_netdevice_notifier(&macvlan_notifier_block
);
1028 module_init(macvlan_init_module
);
1029 module_exit(macvlan_cleanup_module
);
1031 MODULE_LICENSE("GPL");
1032 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1033 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1034 MODULE_ALIAS_RTNL_LINK("macvlan");