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 #define macvlan_port_get_rcu(dev) \
50 ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
51 #define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
52 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
54 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
55 const unsigned char *addr)
57 struct macvlan_dev *vlan;
59 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) {
60 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
66 static void macvlan_hash_add(struct macvlan_dev *vlan)
68 struct macvlan_port *port = vlan->port;
69 const unsigned char *addr = vlan->dev->dev_addr;
71 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
74 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
76 hlist_del_rcu(&vlan->hlist);
81 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
82 const unsigned char *addr)
84 macvlan_hash_del(vlan, true);
85 /* Now that we are unhashed it is safe to change the device
86 * address without confusing packet delivery.
88 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
89 macvlan_hash_add(vlan);
92 static int macvlan_addr_busy(const struct macvlan_port *port,
93 const unsigned char *addr)
95 /* Test to see if the specified multicast address is
96 * currently in use by the underlying device or
99 if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
102 if (macvlan_hash_lookup(port, addr))
109 static int macvlan_broadcast_one(struct sk_buff *skb,
110 const struct macvlan_dev *vlan,
111 const struct ethhdr *eth, bool local)
113 struct net_device *dev = vlan->dev;
118 return vlan->forward(dev, skb);
121 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
122 skb->pkt_type = PACKET_BROADCAST;
124 skb->pkt_type = PACKET_MULTICAST;
126 return vlan->receive(skb);
129 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
131 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
135 static unsigned int mc_hash(const struct macvlan_dev *vlan,
136 const unsigned char *addr)
138 u32 val = __get_unaligned_cpu32(addr + 2);
140 val ^= macvlan_hash_mix(vlan);
141 return hash_32(val, MACVLAN_MC_FILTER_BITS);
144 static void macvlan_broadcast(struct sk_buff *skb,
145 const struct macvlan_port *port,
146 struct net_device *src,
147 enum macvlan_mode mode)
149 const struct ethhdr *eth = eth_hdr(skb);
150 const struct macvlan_dev *vlan;
151 struct sk_buff *nskb;
156 if (skb->protocol == htons(ETH_P_PAUSE))
159 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
160 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
161 if (vlan->dev == src || !(vlan->mode & mode))
164 hash = mc_hash(vlan, eth->h_dest);
165 if (!test_bit(hash, vlan->mc_filter))
167 nskb = skb_clone(skb, GFP_ATOMIC);
168 err = macvlan_broadcast_one(nskb, vlan, eth,
169 mode == MACVLAN_MODE_BRIDGE);
170 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
171 err == NET_RX_SUCCESS, 1);
176 /* called under rcu_read_lock() from netif_receive_skb */
177 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
179 struct macvlan_port *port;
180 struct sk_buff *skb = *pskb;
181 const struct ethhdr *eth = eth_hdr(skb);
182 const struct macvlan_dev *vlan;
183 const struct macvlan_dev *src;
184 struct net_device *dev;
185 unsigned int len = 0;
186 int ret = NET_RX_DROP;
188 port = macvlan_port_get_rcu(skb->dev);
189 if (is_multicast_ether_addr(eth->h_dest)) {
190 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
192 return RX_HANDLER_CONSUMED;
194 src = macvlan_hash_lookup(port, eth->h_source);
196 /* frame comes from an external address */
197 macvlan_broadcast(skb, port, NULL,
198 MACVLAN_MODE_PRIVATE |
200 MACVLAN_MODE_PASSTHRU|
201 MACVLAN_MODE_BRIDGE);
202 else if (src->mode == MACVLAN_MODE_VEPA)
203 /* flood to everyone except source */
204 macvlan_broadcast(skb, port, src->dev,
206 MACVLAN_MODE_BRIDGE);
207 else if (src->mode == MACVLAN_MODE_BRIDGE)
209 * flood only to VEPA ports, bridge ports
210 * already saw the frame on the way out.
212 macvlan_broadcast(skb, port, src->dev,
215 /* forward to original port. */
217 ret = macvlan_broadcast_one(skb, vlan, eth, 0);
221 return RX_HANDLER_PASS;
225 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
227 vlan = macvlan_hash_lookup(port, eth->h_dest);
229 return RX_HANDLER_PASS;
232 if (unlikely(!(dev->flags & IFF_UP))) {
234 return RX_HANDLER_CONSUMED;
236 len = skb->len + ETH_HLEN;
237 skb = skb_share_check(skb, GFP_ATOMIC);
242 skb->pkt_type = PACKET_HOST;
244 ret = vlan->receive(skb);
247 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
248 return RX_HANDLER_CONSUMED;
251 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
253 const struct macvlan_dev *vlan = netdev_priv(dev);
254 const struct macvlan_port *port = vlan->port;
255 const struct macvlan_dev *dest;
256 __u8 ip_summed = skb->ip_summed;
258 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
259 const struct ethhdr *eth = (void *)skb->data;
260 skb->ip_summed = CHECKSUM_UNNECESSARY;
262 /* send to other bridge ports directly */
263 if (is_multicast_ether_addr(eth->h_dest)) {
264 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
268 dest = macvlan_hash_lookup(port, eth->h_dest);
269 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
270 /* send to lowerdev first for its network taps */
271 dev_forward_skb(vlan->lowerdev, skb);
273 return NET_XMIT_SUCCESS;
278 skb->ip_summed = ip_summed;
279 skb->dev = vlan->lowerdev;
280 return dev_queue_xmit(skb);
283 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
284 struct net_device *dev)
286 unsigned int len = skb->len;
288 const struct macvlan_dev *vlan = netdev_priv(dev);
290 ret = macvlan_queue_xmit(skb, dev);
291 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
292 struct macvlan_pcpu_stats *pcpu_stats;
294 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
295 u64_stats_update_begin(&pcpu_stats->syncp);
296 pcpu_stats->tx_packets++;
297 pcpu_stats->tx_bytes += len;
298 u64_stats_update_end(&pcpu_stats->syncp);
300 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
304 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
306 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
307 unsigned short type, const void *daddr,
308 const void *saddr, unsigned len)
310 const struct macvlan_dev *vlan = netdev_priv(dev);
311 struct net_device *lowerdev = vlan->lowerdev;
313 return dev_hard_header(skb, lowerdev, type, daddr,
314 saddr ? : dev->dev_addr, len);
317 static const struct header_ops macvlan_hard_header_ops = {
318 .create = macvlan_hard_header,
319 .rebuild = eth_rebuild_header,
320 .parse = eth_header_parse,
321 .cache = eth_header_cache,
322 .cache_update = eth_header_cache_update,
325 static int macvlan_open(struct net_device *dev)
327 struct macvlan_dev *vlan = netdev_priv(dev);
328 struct net_device *lowerdev = vlan->lowerdev;
331 if (vlan->port->passthru) {
332 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
333 dev_set_promiscuity(lowerdev, 1);
338 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
341 err = dev_uc_add(lowerdev, dev->dev_addr);
344 if (dev->flags & IFF_ALLMULTI) {
345 err = dev_set_allmulti(lowerdev, 1);
351 macvlan_hash_add(vlan);
355 dev_uc_del(lowerdev, dev->dev_addr);
360 static int macvlan_stop(struct net_device *dev)
362 struct macvlan_dev *vlan = netdev_priv(dev);
363 struct net_device *lowerdev = vlan->lowerdev;
365 dev_uc_unsync(lowerdev, dev);
366 dev_mc_unsync(lowerdev, dev);
368 if (vlan->port->passthru) {
369 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
370 dev_set_promiscuity(lowerdev, -1);
374 if (dev->flags & IFF_ALLMULTI)
375 dev_set_allmulti(lowerdev, -1);
377 dev_uc_del(lowerdev, dev->dev_addr);
380 macvlan_hash_del(vlan, !dev->dismantle);
384 static int macvlan_set_mac_address(struct net_device *dev, void *p)
386 struct macvlan_dev *vlan = netdev_priv(dev);
387 struct net_device *lowerdev = vlan->lowerdev;
388 struct sockaddr *addr = p;
391 if (!is_valid_ether_addr(addr->sa_data))
392 return -EADDRNOTAVAIL;
394 if (!(dev->flags & IFF_UP)) {
395 /* Just copy in the new address */
396 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
398 /* Rehash and update the device filters */
399 if (macvlan_addr_busy(vlan->port, addr->sa_data))
402 err = dev_uc_add(lowerdev, addr->sa_data);
406 dev_uc_del(lowerdev, dev->dev_addr);
408 macvlan_hash_change_addr(vlan, addr->sa_data);
413 static void macvlan_change_rx_flags(struct net_device *dev, int change)
415 struct macvlan_dev *vlan = netdev_priv(dev);
416 struct net_device *lowerdev = vlan->lowerdev;
418 if (change & IFF_ALLMULTI)
419 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
422 static void macvlan_set_mac_lists(struct net_device *dev)
424 struct macvlan_dev *vlan = netdev_priv(dev);
426 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
427 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
429 struct netdev_hw_addr *ha;
430 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
432 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
433 netdev_for_each_mc_addr(ha, dev) {
434 __set_bit(mc_hash(vlan, ha->addr), filter);
437 __set_bit(mc_hash(vlan, dev->broadcast), filter);
439 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
441 dev_uc_sync(vlan->lowerdev, dev);
442 dev_mc_sync(vlan->lowerdev, dev);
445 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
447 struct macvlan_dev *vlan = netdev_priv(dev);
449 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
456 * macvlan network devices have devices nesting below it and are a special
457 * "super class" of normal network devices; split their locks off into a
458 * separate class since they always nest.
460 static struct lock_class_key macvlan_netdev_xmit_lock_key;
461 static struct lock_class_key macvlan_netdev_addr_lock_key;
463 #define MACVLAN_FEATURES \
464 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
465 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
466 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
467 NETIF_F_HW_VLAN_FILTER)
469 #define MACVLAN_STATE_MASK \
470 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
472 static void macvlan_set_lockdep_class_one(struct net_device *dev,
473 struct netdev_queue *txq,
476 lockdep_set_class(&txq->_xmit_lock,
477 &macvlan_netdev_xmit_lock_key);
480 static void macvlan_set_lockdep_class(struct net_device *dev)
482 lockdep_set_class(&dev->addr_list_lock,
483 &macvlan_netdev_addr_lock_key);
484 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
487 static int macvlan_init(struct net_device *dev)
489 struct macvlan_dev *vlan = netdev_priv(dev);
490 const struct net_device *lowerdev = vlan->lowerdev;
492 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
493 (lowerdev->state & MACVLAN_STATE_MASK);
494 dev->features = lowerdev->features & MACVLAN_FEATURES;
495 dev->features |= NETIF_F_LLTX;
496 dev->gso_max_size = lowerdev->gso_max_size;
497 dev->iflink = lowerdev->ifindex;
498 dev->hard_header_len = lowerdev->hard_header_len;
500 macvlan_set_lockdep_class(dev);
502 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
503 if (!vlan->pcpu_stats)
509 static void macvlan_uninit(struct net_device *dev)
511 struct macvlan_dev *vlan = netdev_priv(dev);
512 struct macvlan_port *port = vlan->port;
514 free_percpu(vlan->pcpu_stats);
518 macvlan_port_destroy(port->dev);
521 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
522 struct rtnl_link_stats64 *stats)
524 struct macvlan_dev *vlan = netdev_priv(dev);
526 if (vlan->pcpu_stats) {
527 struct macvlan_pcpu_stats *p;
528 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
529 u32 rx_errors = 0, tx_dropped = 0;
533 for_each_possible_cpu(i) {
534 p = per_cpu_ptr(vlan->pcpu_stats, i);
536 start = u64_stats_fetch_begin_bh(&p->syncp);
537 rx_packets = p->rx_packets;
538 rx_bytes = p->rx_bytes;
539 rx_multicast = p->rx_multicast;
540 tx_packets = p->tx_packets;
541 tx_bytes = p->tx_bytes;
542 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
544 stats->rx_packets += rx_packets;
545 stats->rx_bytes += rx_bytes;
546 stats->multicast += rx_multicast;
547 stats->tx_packets += tx_packets;
548 stats->tx_bytes += tx_bytes;
549 /* rx_errors & tx_dropped are u32, updated
550 * without syncp protection.
552 rx_errors += p->rx_errors;
553 tx_dropped += p->tx_dropped;
555 stats->rx_errors = rx_errors;
556 stats->rx_dropped = rx_errors;
557 stats->tx_dropped = tx_dropped;
562 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
565 struct macvlan_dev *vlan = netdev_priv(dev);
566 struct net_device *lowerdev = vlan->lowerdev;
568 return vlan_vid_add(lowerdev, vid);
571 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
574 struct macvlan_dev *vlan = netdev_priv(dev);
575 struct net_device *lowerdev = vlan->lowerdev;
577 vlan_vid_del(lowerdev, vid);
581 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
582 struct net_device *dev,
583 const unsigned char *addr,
586 struct macvlan_dev *vlan = netdev_priv(dev);
589 if (!vlan->port->passthru)
592 if (is_unicast_ether_addr(addr))
593 err = dev_uc_add_excl(dev, addr);
594 else if (is_multicast_ether_addr(addr))
595 err = dev_mc_add_excl(dev, addr);
600 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
601 struct net_device *dev,
602 const unsigned char *addr)
604 struct macvlan_dev *vlan = netdev_priv(dev);
607 if (!vlan->port->passthru)
610 if (is_unicast_ether_addr(addr))
611 err = dev_uc_del(dev, addr);
612 else if (is_multicast_ether_addr(addr))
613 err = dev_mc_del(dev, addr);
618 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
619 struct ethtool_drvinfo *drvinfo)
621 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
622 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
625 static int macvlan_ethtool_get_settings(struct net_device *dev,
626 struct ethtool_cmd *cmd)
628 const struct macvlan_dev *vlan = netdev_priv(dev);
630 return __ethtool_get_settings(vlan->lowerdev, cmd);
633 static const struct ethtool_ops macvlan_ethtool_ops = {
634 .get_link = ethtool_op_get_link,
635 .get_settings = macvlan_ethtool_get_settings,
636 .get_drvinfo = macvlan_ethtool_get_drvinfo,
639 static const struct net_device_ops macvlan_netdev_ops = {
640 .ndo_init = macvlan_init,
641 .ndo_uninit = macvlan_uninit,
642 .ndo_open = macvlan_open,
643 .ndo_stop = macvlan_stop,
644 .ndo_start_xmit = macvlan_start_xmit,
645 .ndo_change_mtu = macvlan_change_mtu,
646 .ndo_change_rx_flags = macvlan_change_rx_flags,
647 .ndo_set_mac_address = macvlan_set_mac_address,
648 .ndo_set_rx_mode = macvlan_set_mac_lists,
649 .ndo_get_stats64 = macvlan_dev_get_stats64,
650 .ndo_validate_addr = eth_validate_addr,
651 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
652 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
653 .ndo_fdb_add = macvlan_fdb_add,
654 .ndo_fdb_del = macvlan_fdb_del,
655 .ndo_fdb_dump = ndo_dflt_fdb_dump,
658 void macvlan_common_setup(struct net_device *dev)
662 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
663 dev->netdev_ops = &macvlan_netdev_ops;
664 dev->destructor = free_netdev;
665 dev->header_ops = &macvlan_hard_header_ops,
666 dev->ethtool_ops = &macvlan_ethtool_ops;
668 EXPORT_SYMBOL_GPL(macvlan_common_setup);
670 static void macvlan_setup(struct net_device *dev)
672 macvlan_common_setup(dev);
673 dev->tx_queue_len = 0;
676 static int macvlan_port_create(struct net_device *dev)
678 struct macvlan_port *port;
682 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
685 port = kzalloc(sizeof(*port), GFP_KERNEL);
689 port->passthru = false;
691 INIT_LIST_HEAD(&port->vlans);
692 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
693 INIT_HLIST_HEAD(&port->vlan_hash[i]);
695 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
699 dev->priv_flags |= IFF_MACVLAN_PORT;
703 static void macvlan_port_destroy(struct net_device *dev)
705 struct macvlan_port *port = macvlan_port_get(dev);
707 dev->priv_flags &= ~IFF_MACVLAN_PORT;
708 netdev_rx_handler_unregister(dev);
709 kfree_rcu(port, rcu);
712 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
714 if (tb[IFLA_ADDRESS]) {
715 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
717 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
718 return -EADDRNOTAVAIL;
721 if (data && data[IFLA_MACVLAN_MODE]) {
722 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
723 case MACVLAN_MODE_PRIVATE:
724 case MACVLAN_MODE_VEPA:
725 case MACVLAN_MODE_BRIDGE:
726 case MACVLAN_MODE_PASSTHRU:
735 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
736 struct nlattr *tb[], struct nlattr *data[],
737 int (*receive)(struct sk_buff *skb),
738 int (*forward)(struct net_device *dev,
739 struct sk_buff *skb))
741 struct macvlan_dev *vlan = netdev_priv(dev);
742 struct macvlan_port *port;
743 struct net_device *lowerdev;
749 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
750 if (lowerdev == NULL)
753 /* When creating macvlans on top of other macvlans - use
754 * the real device as the lowerdev.
756 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
757 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
758 lowerdev = lowervlan->lowerdev;
762 dev->mtu = lowerdev->mtu;
763 else if (dev->mtu > lowerdev->mtu)
766 if (!tb[IFLA_ADDRESS])
767 eth_hw_addr_random(dev);
769 if (!macvlan_port_exists(lowerdev)) {
770 err = macvlan_port_create(lowerdev);
774 port = macvlan_port_get(lowerdev);
776 /* Only 1 macvlan device can be created in passthru mode */
780 vlan->lowerdev = lowerdev;
783 vlan->receive = receive;
784 vlan->forward = forward;
786 vlan->mode = MACVLAN_MODE_VEPA;
787 if (data && data[IFLA_MACVLAN_MODE])
788 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
790 if (data && data[IFLA_MACVLAN_FLAGS])
791 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
793 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
796 port->passthru = true;
797 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
800 err = netdev_upper_dev_link(lowerdev, dev);
805 err = register_netdevice(dev);
807 goto upper_dev_unlink;
809 list_add_tail(&vlan->list, &port->vlans);
810 netif_stacked_transfer_operstate(lowerdev, dev);
815 netdev_upper_dev_unlink(lowerdev, dev);
819 macvlan_port_destroy(lowerdev);
823 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
825 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
826 struct nlattr *tb[], struct nlattr *data[])
828 return macvlan_common_newlink(src_net, dev, tb, data,
833 void macvlan_dellink(struct net_device *dev, struct list_head *head)
835 struct macvlan_dev *vlan = netdev_priv(dev);
837 list_del(&vlan->list);
838 unregister_netdevice_queue(dev, head);
839 netdev_upper_dev_unlink(vlan->lowerdev, dev);
841 EXPORT_SYMBOL_GPL(macvlan_dellink);
843 static int macvlan_changelink(struct net_device *dev,
844 struct nlattr *tb[], struct nlattr *data[])
846 struct macvlan_dev *vlan = netdev_priv(dev);
847 if (data && data[IFLA_MACVLAN_MODE])
848 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
849 if (data && data[IFLA_MACVLAN_FLAGS]) {
850 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
851 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
853 if (promisc && (flags & MACVLAN_FLAG_NOPROMISC))
854 dev_set_promiscuity(vlan->lowerdev, -1);
855 else if (promisc && !(flags & MACVLAN_FLAG_NOPROMISC))
856 dev_set_promiscuity(vlan->lowerdev, 1);
862 static size_t macvlan_get_size(const struct net_device *dev)
865 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
866 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
870 static int macvlan_fill_info(struct sk_buff *skb,
871 const struct net_device *dev)
873 struct macvlan_dev *vlan = netdev_priv(dev);
875 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
876 goto nla_put_failure;
877 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
878 goto nla_put_failure;
885 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
886 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
887 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
890 int macvlan_link_register(struct rtnl_link_ops *ops)
893 ops->priv_size = sizeof(struct macvlan_dev);
894 ops->validate = macvlan_validate;
895 ops->maxtype = IFLA_MACVLAN_MAX;
896 ops->policy = macvlan_policy;
897 ops->changelink = macvlan_changelink;
898 ops->get_size = macvlan_get_size;
899 ops->fill_info = macvlan_fill_info;
901 return rtnl_link_register(ops);
903 EXPORT_SYMBOL_GPL(macvlan_link_register);
905 static struct rtnl_link_ops macvlan_link_ops = {
907 .setup = macvlan_setup,
908 .newlink = macvlan_newlink,
909 .dellink = macvlan_dellink,
912 static int macvlan_device_event(struct notifier_block *unused,
913 unsigned long event, void *ptr)
915 struct net_device *dev = ptr;
916 struct macvlan_dev *vlan, *next;
917 struct macvlan_port *port;
918 LIST_HEAD(list_kill);
920 if (!macvlan_port_exists(dev))
923 port = macvlan_port_get(dev);
927 list_for_each_entry(vlan, &port->vlans, list)
928 netif_stacked_transfer_operstate(vlan->lowerdev,
931 case NETDEV_FEAT_CHANGE:
932 list_for_each_entry(vlan, &port->vlans, list) {
933 vlan->dev->features = dev->features & MACVLAN_FEATURES;
934 vlan->dev->gso_max_size = dev->gso_max_size;
935 netdev_features_change(vlan->dev);
938 case NETDEV_UNREGISTER:
939 /* twiddle thumbs on netns device moves */
940 if (dev->reg_state != NETREG_UNREGISTERING)
943 list_for_each_entry_safe(vlan, next, &port->vlans, list)
944 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
945 unregister_netdevice_many(&list_kill);
946 list_del(&list_kill);
948 case NETDEV_PRE_TYPE_CHANGE:
949 /* Forbid underlaying device to change its type. */
955 static struct notifier_block macvlan_notifier_block __read_mostly = {
956 .notifier_call = macvlan_device_event,
959 static int __init macvlan_init_module(void)
963 register_netdevice_notifier(&macvlan_notifier_block);
965 err = macvlan_link_register(&macvlan_link_ops);
970 unregister_netdevice_notifier(&macvlan_notifier_block);
974 static void __exit macvlan_cleanup_module(void)
976 rtnl_link_unregister(&macvlan_link_ops);
977 unregister_netdevice_notifier(&macvlan_notifier_block);
980 module_init(macvlan_init_module);
981 module_exit(macvlan_cleanup_module);
983 MODULE_LICENSE("GPL");
984 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
985 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
986 MODULE_ALIAS_RTNL_LINK("macvlan");