dmaengine: imx-sdma: Let the core do the device node validation
[linux/fpc-iii.git] / drivers / net / macvlan.c
blob92efa93649f0e0a0fe031a3528854f26e6d333b3
1 /*
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:
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 * ---
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/net_tstamp.h>
28 #include <linux/ethtool.h>
29 #include <linux/if_arp.h>
30 #include <linux/if_vlan.h>
31 #include <linux/if_link.h>
32 #include <linux/if_macvlan.h>
33 #include <linux/hash.h>
34 #include <linux/workqueue.h>
35 #include <net/rtnetlink.h>
36 #include <net/xfrm.h>
37 #include <linux/netpoll.h>
38 #include <linux/phy.h>
40 #define MACVLAN_HASH_BITS 8
41 #define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS)
42 #define MACVLAN_BC_QUEUE_LEN 1000
44 #define MACVLAN_F_PASSTHRU 1
45 #define MACVLAN_F_ADDRCHANGE 2
47 struct macvlan_port {
48 struct net_device *dev;
49 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
50 struct list_head vlans;
51 struct sk_buff_head bc_queue;
52 struct work_struct bc_work;
53 u32 flags;
54 int count;
55 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
56 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
57 unsigned char perm_addr[ETH_ALEN];
60 struct macvlan_source_entry {
61 struct hlist_node hlist;
62 struct macvlan_dev *vlan;
63 unsigned char addr[6+2] __aligned(sizeof(u16));
64 struct rcu_head rcu;
67 struct macvlan_skb_cb {
68 const struct macvlan_dev *src;
71 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
73 static void macvlan_port_destroy(struct net_device *dev);
75 static inline bool macvlan_passthru(const struct macvlan_port *port)
77 return port->flags & MACVLAN_F_PASSTHRU;
80 static inline void macvlan_set_passthru(struct macvlan_port *port)
82 port->flags |= MACVLAN_F_PASSTHRU;
85 static inline bool macvlan_addr_change(const struct macvlan_port *port)
87 return port->flags & MACVLAN_F_ADDRCHANGE;
90 static inline void macvlan_set_addr_change(struct macvlan_port *port)
92 port->flags |= MACVLAN_F_ADDRCHANGE;
95 static inline void macvlan_clear_addr_change(struct macvlan_port *port)
97 port->flags &= ~MACVLAN_F_ADDRCHANGE;
100 /* Hash Ethernet address */
101 static u32 macvlan_eth_hash(const unsigned char *addr)
103 u64 value = get_unaligned((u64 *)addr);
105 /* only want 6 bytes */
106 #ifdef __BIG_ENDIAN
107 value >>= 16;
108 #else
109 value <<= 16;
110 #endif
111 return hash_64(value, MACVLAN_HASH_BITS);
114 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
116 return rcu_dereference(dev->rx_handler_data);
119 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
121 return rtnl_dereference(dev->rx_handler_data);
124 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
125 const unsigned char *addr)
127 struct macvlan_dev *vlan;
128 u32 idx = macvlan_eth_hash(addr);
130 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) {
131 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
132 return vlan;
134 return NULL;
137 static struct macvlan_source_entry *macvlan_hash_lookup_source(
138 const struct macvlan_dev *vlan,
139 const unsigned char *addr)
141 struct macvlan_source_entry *entry;
142 u32 idx = macvlan_eth_hash(addr);
143 struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
145 hlist_for_each_entry_rcu(entry, h, hlist) {
146 if (ether_addr_equal_64bits(entry->addr, addr) &&
147 entry->vlan == vlan)
148 return entry;
150 return NULL;
153 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
154 const unsigned char *addr)
156 struct macvlan_port *port = vlan->port;
157 struct macvlan_source_entry *entry;
158 struct hlist_head *h;
160 entry = macvlan_hash_lookup_source(vlan, addr);
161 if (entry)
162 return 0;
164 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
165 if (!entry)
166 return -ENOMEM;
168 ether_addr_copy(entry->addr, addr);
169 entry->vlan = vlan;
170 h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
171 hlist_add_head_rcu(&entry->hlist, h);
172 vlan->macaddr_count++;
174 return 0;
177 static void macvlan_hash_add(struct macvlan_dev *vlan)
179 struct macvlan_port *port = vlan->port;
180 const unsigned char *addr = vlan->dev->dev_addr;
181 u32 idx = macvlan_eth_hash(addr);
183 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
186 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
188 hlist_del_rcu(&entry->hlist);
189 kfree_rcu(entry, rcu);
192 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
194 hlist_del_rcu(&vlan->hlist);
195 if (sync)
196 synchronize_rcu();
199 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
200 const unsigned char *addr)
202 macvlan_hash_del(vlan, true);
203 /* Now that we are unhashed it is safe to change the device
204 * address without confusing packet delivery.
206 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
207 macvlan_hash_add(vlan);
210 static bool macvlan_addr_busy(const struct macvlan_port *port,
211 const unsigned char *addr)
213 /* Test to see if the specified address is
214 * currently in use by the underlying device or
215 * another macvlan.
217 if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
218 ether_addr_equal_64bits(port->dev->dev_addr, addr))
219 return true;
221 if (macvlan_hash_lookup(port, addr))
222 return true;
224 return false;
228 static int macvlan_broadcast_one(struct sk_buff *skb,
229 const struct macvlan_dev *vlan,
230 const struct ethhdr *eth, bool local)
232 struct net_device *dev = vlan->dev;
234 if (local)
235 return __dev_forward_skb(dev, skb);
237 skb->dev = dev;
238 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
239 skb->pkt_type = PACKET_BROADCAST;
240 else
241 skb->pkt_type = PACKET_MULTICAST;
243 return 0;
246 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
248 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
252 static unsigned int mc_hash(const struct macvlan_dev *vlan,
253 const unsigned char *addr)
255 u32 val = __get_unaligned_cpu32(addr + 2);
257 val ^= macvlan_hash_mix(vlan);
258 return hash_32(val, MACVLAN_MC_FILTER_BITS);
261 static void macvlan_broadcast(struct sk_buff *skb,
262 const struct macvlan_port *port,
263 struct net_device *src,
264 enum macvlan_mode mode)
266 const struct ethhdr *eth = eth_hdr(skb);
267 const struct macvlan_dev *vlan;
268 struct sk_buff *nskb;
269 unsigned int i;
270 int err;
271 unsigned int hash;
273 if (skb->protocol == htons(ETH_P_PAUSE))
274 return;
276 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
277 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
278 if (vlan->dev == src || !(vlan->mode & mode))
279 continue;
281 hash = mc_hash(vlan, eth->h_dest);
282 if (!test_bit(hash, vlan->mc_filter))
283 continue;
285 err = NET_RX_DROP;
286 nskb = skb_clone(skb, GFP_ATOMIC);
287 if (likely(nskb))
288 err = macvlan_broadcast_one(
289 nskb, vlan, eth,
290 mode == MACVLAN_MODE_BRIDGE) ?:
291 netif_rx_ni(nskb);
292 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
293 err == NET_RX_SUCCESS, true);
298 static void macvlan_process_broadcast(struct work_struct *w)
300 struct macvlan_port *port = container_of(w, struct macvlan_port,
301 bc_work);
302 struct sk_buff *skb;
303 struct sk_buff_head list;
305 __skb_queue_head_init(&list);
307 spin_lock_bh(&port->bc_queue.lock);
308 skb_queue_splice_tail_init(&port->bc_queue, &list);
309 spin_unlock_bh(&port->bc_queue.lock);
311 while ((skb = __skb_dequeue(&list))) {
312 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
314 rcu_read_lock();
316 if (!src)
317 /* frame comes from an external address */
318 macvlan_broadcast(skb, port, NULL,
319 MACVLAN_MODE_PRIVATE |
320 MACVLAN_MODE_VEPA |
321 MACVLAN_MODE_PASSTHRU|
322 MACVLAN_MODE_BRIDGE);
323 else if (src->mode == MACVLAN_MODE_VEPA)
324 /* flood to everyone except source */
325 macvlan_broadcast(skb, port, src->dev,
326 MACVLAN_MODE_VEPA |
327 MACVLAN_MODE_BRIDGE);
328 else
330 * flood only to VEPA ports, bridge ports
331 * already saw the frame on the way out.
333 macvlan_broadcast(skb, port, src->dev,
334 MACVLAN_MODE_VEPA);
336 rcu_read_unlock();
338 if (src)
339 dev_put(src->dev);
340 consume_skb(skb);
344 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
345 const struct macvlan_dev *src,
346 struct sk_buff *skb)
348 struct sk_buff *nskb;
349 int err = -ENOMEM;
351 nskb = skb_clone(skb, GFP_ATOMIC);
352 if (!nskb)
353 goto err;
355 MACVLAN_SKB_CB(nskb)->src = src;
357 spin_lock(&port->bc_queue.lock);
358 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
359 if (src)
360 dev_hold(src->dev);
361 __skb_queue_tail(&port->bc_queue, nskb);
362 err = 0;
364 spin_unlock(&port->bc_queue.lock);
366 if (err)
367 goto free_nskb;
369 schedule_work(&port->bc_work);
370 return;
372 free_nskb:
373 kfree_skb(nskb);
374 err:
375 atomic_long_inc(&skb->dev->rx_dropped);
378 static void macvlan_flush_sources(struct macvlan_port *port,
379 struct macvlan_dev *vlan)
381 int i;
383 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
384 struct hlist_node *h, *n;
386 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
387 struct macvlan_source_entry *entry;
389 entry = hlist_entry(h, struct macvlan_source_entry,
390 hlist);
391 if (entry->vlan == vlan)
392 macvlan_hash_del_source(entry);
395 vlan->macaddr_count = 0;
398 static void macvlan_forward_source_one(struct sk_buff *skb,
399 struct macvlan_dev *vlan)
401 struct sk_buff *nskb;
402 struct net_device *dev;
403 int len;
404 int ret;
406 dev = vlan->dev;
407 if (unlikely(!(dev->flags & IFF_UP)))
408 return;
410 nskb = skb_clone(skb, GFP_ATOMIC);
411 if (!nskb)
412 return;
414 len = nskb->len + ETH_HLEN;
415 nskb->dev = dev;
417 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
418 nskb->pkt_type = PACKET_HOST;
420 ret = netif_rx(nskb);
421 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
424 static void macvlan_forward_source(struct sk_buff *skb,
425 struct macvlan_port *port,
426 const unsigned char *addr)
428 struct macvlan_source_entry *entry;
429 u32 idx = macvlan_eth_hash(addr);
430 struct hlist_head *h = &port->vlan_source_hash[idx];
432 hlist_for_each_entry_rcu(entry, h, hlist) {
433 if (ether_addr_equal_64bits(entry->addr, addr))
434 macvlan_forward_source_one(skb, entry->vlan);
438 /* called under rcu_read_lock() from netif_receive_skb */
439 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
441 struct macvlan_port *port;
442 struct sk_buff *skb = *pskb;
443 const struct ethhdr *eth = eth_hdr(skb);
444 const struct macvlan_dev *vlan;
445 const struct macvlan_dev *src;
446 struct net_device *dev;
447 unsigned int len = 0;
448 int ret;
449 rx_handler_result_t handle_res;
451 port = macvlan_port_get_rcu(skb->dev);
452 if (is_multicast_ether_addr(eth->h_dest)) {
453 unsigned int hash;
455 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
456 if (!skb)
457 return RX_HANDLER_CONSUMED;
458 *pskb = skb;
459 eth = eth_hdr(skb);
460 macvlan_forward_source(skb, port, eth->h_source);
461 src = macvlan_hash_lookup(port, eth->h_source);
462 if (src && src->mode != MACVLAN_MODE_VEPA &&
463 src->mode != MACVLAN_MODE_BRIDGE) {
464 /* forward to original port. */
465 vlan = src;
466 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
467 netif_rx(skb);
468 handle_res = RX_HANDLER_CONSUMED;
469 goto out;
472 hash = mc_hash(NULL, eth->h_dest);
473 if (test_bit(hash, port->mc_filter))
474 macvlan_broadcast_enqueue(port, src, skb);
476 return RX_HANDLER_PASS;
479 macvlan_forward_source(skb, port, eth->h_source);
480 if (macvlan_passthru(port))
481 vlan = list_first_or_null_rcu(&port->vlans,
482 struct macvlan_dev, list);
483 else
484 vlan = macvlan_hash_lookup(port, eth->h_dest);
485 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
486 return RX_HANDLER_PASS;
488 dev = vlan->dev;
489 if (unlikely(!(dev->flags & IFF_UP))) {
490 kfree_skb(skb);
491 return RX_HANDLER_CONSUMED;
493 len = skb->len + ETH_HLEN;
494 skb = skb_share_check(skb, GFP_ATOMIC);
495 if (!skb) {
496 ret = NET_RX_DROP;
497 handle_res = RX_HANDLER_CONSUMED;
498 goto out;
501 *pskb = skb;
502 skb->dev = dev;
503 skb->pkt_type = PACKET_HOST;
505 ret = NET_RX_SUCCESS;
506 handle_res = RX_HANDLER_ANOTHER;
507 out:
508 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
509 return handle_res;
512 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
514 const struct macvlan_dev *vlan = netdev_priv(dev);
515 const struct macvlan_port *port = vlan->port;
516 const struct macvlan_dev *dest;
518 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
519 const struct ethhdr *eth = (void *)skb->data;
521 /* send to other bridge ports directly */
522 if (is_multicast_ether_addr(eth->h_dest)) {
523 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
524 goto xmit_world;
527 dest = macvlan_hash_lookup(port, eth->h_dest);
528 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
529 /* send to lowerdev first for its network taps */
530 dev_forward_skb(vlan->lowerdev, skb);
532 return NET_XMIT_SUCCESS;
535 xmit_world:
536 skb->dev = vlan->lowerdev;
537 return dev_queue_xmit_accel(skb,
538 netdev_get_sb_channel(dev) ? dev : NULL);
541 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
543 #ifdef CONFIG_NET_POLL_CONTROLLER
544 if (vlan->netpoll)
545 netpoll_send_skb(vlan->netpoll, skb);
546 #else
547 BUG();
548 #endif
549 return NETDEV_TX_OK;
552 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
553 struct net_device *dev)
555 struct macvlan_dev *vlan = netdev_priv(dev);
556 unsigned int len = skb->len;
557 int ret;
559 if (unlikely(netpoll_tx_running(dev)))
560 return macvlan_netpoll_send_skb(vlan, skb);
562 ret = macvlan_queue_xmit(skb, dev);
564 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
565 struct vlan_pcpu_stats *pcpu_stats;
567 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
568 u64_stats_update_begin(&pcpu_stats->syncp);
569 pcpu_stats->tx_packets++;
570 pcpu_stats->tx_bytes += len;
571 u64_stats_update_end(&pcpu_stats->syncp);
572 } else {
573 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
575 return ret;
578 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
579 unsigned short type, const void *daddr,
580 const void *saddr, unsigned len)
582 const struct macvlan_dev *vlan = netdev_priv(dev);
583 struct net_device *lowerdev = vlan->lowerdev;
585 return dev_hard_header(skb, lowerdev, type, daddr,
586 saddr ? : dev->dev_addr, len);
589 static const struct header_ops macvlan_hard_header_ops = {
590 .create = macvlan_hard_header,
591 .parse = eth_header_parse,
592 .cache = eth_header_cache,
593 .cache_update = eth_header_cache_update,
596 static int macvlan_open(struct net_device *dev)
598 struct macvlan_dev *vlan = netdev_priv(dev);
599 struct net_device *lowerdev = vlan->lowerdev;
600 int err;
602 if (macvlan_passthru(vlan->port)) {
603 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
604 err = dev_set_promiscuity(lowerdev, 1);
605 if (err < 0)
606 goto out;
608 goto hash_add;
611 err = -EADDRINUSE;
612 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
613 goto out;
615 /* Attempt to populate accel_priv which is used to offload the L2
616 * forwarding requests for unicast packets.
618 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
619 vlan->accel_priv =
620 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
622 /* If earlier attempt to offload failed, or accel_priv is not
623 * populated we must add the unicast address to the lower device.
625 if (IS_ERR_OR_NULL(vlan->accel_priv)) {
626 vlan->accel_priv = NULL;
627 err = dev_uc_add(lowerdev, dev->dev_addr);
628 if (err < 0)
629 goto out;
632 if (dev->flags & IFF_ALLMULTI) {
633 err = dev_set_allmulti(lowerdev, 1);
634 if (err < 0)
635 goto del_unicast;
638 if (dev->flags & IFF_PROMISC) {
639 err = dev_set_promiscuity(lowerdev, 1);
640 if (err < 0)
641 goto clear_multi;
644 hash_add:
645 macvlan_hash_add(vlan);
646 return 0;
648 clear_multi:
649 if (dev->flags & IFF_ALLMULTI)
650 dev_set_allmulti(lowerdev, -1);
651 del_unicast:
652 if (vlan->accel_priv) {
653 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
654 vlan->accel_priv);
655 vlan->accel_priv = NULL;
656 } else {
657 dev_uc_del(lowerdev, dev->dev_addr);
659 out:
660 return err;
663 static int macvlan_stop(struct net_device *dev)
665 struct macvlan_dev *vlan = netdev_priv(dev);
666 struct net_device *lowerdev = vlan->lowerdev;
668 if (vlan->accel_priv) {
669 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
670 vlan->accel_priv);
671 vlan->accel_priv = NULL;
674 dev_uc_unsync(lowerdev, dev);
675 dev_mc_unsync(lowerdev, dev);
677 if (macvlan_passthru(vlan->port)) {
678 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
679 dev_set_promiscuity(lowerdev, -1);
680 goto hash_del;
683 if (dev->flags & IFF_ALLMULTI)
684 dev_set_allmulti(lowerdev, -1);
686 if (dev->flags & IFF_PROMISC)
687 dev_set_promiscuity(lowerdev, -1);
689 dev_uc_del(lowerdev, dev->dev_addr);
691 hash_del:
692 macvlan_hash_del(vlan, !dev->dismantle);
693 return 0;
696 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
698 struct macvlan_dev *vlan = netdev_priv(dev);
699 struct net_device *lowerdev = vlan->lowerdev;
700 struct macvlan_port *port = vlan->port;
701 int err;
703 if (!(dev->flags & IFF_UP)) {
704 /* Just copy in the new address */
705 ether_addr_copy(dev->dev_addr, addr);
706 } else {
707 /* Rehash and update the device filters */
708 if (macvlan_addr_busy(vlan->port, addr))
709 return -EADDRINUSE;
711 if (!macvlan_passthru(port)) {
712 err = dev_uc_add(lowerdev, addr);
713 if (err)
714 return err;
716 dev_uc_del(lowerdev, dev->dev_addr);
719 macvlan_hash_change_addr(vlan, addr);
721 if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
722 /* Since addr_change isn't set, we are here due to lower
723 * device change. Save the lower-dev address so we can
724 * restore it later.
726 ether_addr_copy(vlan->port->perm_addr,
727 lowerdev->dev_addr);
729 macvlan_clear_addr_change(port);
730 return 0;
733 static int macvlan_set_mac_address(struct net_device *dev, void *p)
735 struct macvlan_dev *vlan = netdev_priv(dev);
736 struct sockaddr *addr = p;
738 if (!is_valid_ether_addr(addr->sa_data))
739 return -EADDRNOTAVAIL;
741 /* If the addresses are the same, this is a no-op */
742 if (ether_addr_equal(dev->dev_addr, addr->sa_data))
743 return 0;
745 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
746 macvlan_set_addr_change(vlan->port);
747 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
750 if (macvlan_addr_busy(vlan->port, addr->sa_data))
751 return -EADDRINUSE;
753 return macvlan_sync_address(dev, addr->sa_data);
756 static void macvlan_change_rx_flags(struct net_device *dev, int change)
758 struct macvlan_dev *vlan = netdev_priv(dev);
759 struct net_device *lowerdev = vlan->lowerdev;
761 if (dev->flags & IFF_UP) {
762 if (change & IFF_ALLMULTI)
763 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
764 if (change & IFF_PROMISC)
765 dev_set_promiscuity(lowerdev,
766 dev->flags & IFF_PROMISC ? 1 : -1);
771 static void macvlan_compute_filter(unsigned long *mc_filter,
772 struct net_device *dev,
773 struct macvlan_dev *vlan)
775 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
776 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
777 } else {
778 struct netdev_hw_addr *ha;
779 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
781 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
782 netdev_for_each_mc_addr(ha, dev) {
783 __set_bit(mc_hash(vlan, ha->addr), filter);
786 __set_bit(mc_hash(vlan, dev->broadcast), filter);
788 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
792 static void macvlan_set_mac_lists(struct net_device *dev)
794 struct macvlan_dev *vlan = netdev_priv(dev);
796 macvlan_compute_filter(vlan->mc_filter, dev, vlan);
798 dev_uc_sync(vlan->lowerdev, dev);
799 dev_mc_sync(vlan->lowerdev, dev);
801 /* This is slightly inaccurate as we're including the subscription
802 * list of vlan->lowerdev too.
804 * Bug alert: This only works if everyone has the same broadcast
805 * address as lowerdev. As soon as someone changes theirs this
806 * will break.
808 * However, this is already broken as when you change your broadcast
809 * address we don't get called.
811 * The solution is to maintain a list of broadcast addresses like
812 * we do for uc/mc, if you care.
814 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
817 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
819 struct macvlan_dev *vlan = netdev_priv(dev);
821 if (vlan->lowerdev->mtu < new_mtu)
822 return -EINVAL;
823 dev->mtu = new_mtu;
824 return 0;
827 static int macvlan_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
829 struct net_device *real_dev = macvlan_dev_real_dev(dev);
830 const struct net_device_ops *ops = real_dev->netdev_ops;
831 struct ifreq ifrr;
832 int err = -EOPNOTSUPP;
834 strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
835 ifrr.ifr_ifru = ifr->ifr_ifru;
837 switch (cmd) {
838 case SIOCSHWTSTAMP:
839 if (!net_eq(dev_net(dev), &init_net))
840 break;
841 case SIOCGHWTSTAMP:
842 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
843 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
844 break;
847 if (!err)
848 ifr->ifr_ifru = ifrr.ifr_ifru;
850 return err;
854 * macvlan network devices have devices nesting below it and are a special
855 * "super class" of normal network devices; split their locks off into a
856 * separate class since they always nest.
858 static struct lock_class_key macvlan_netdev_addr_lock_key;
860 #define ALWAYS_ON_OFFLOADS \
861 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
862 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
864 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
866 #define MACVLAN_FEATURES \
867 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
868 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
869 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
870 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
872 #define MACVLAN_STATE_MASK \
873 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
875 static int macvlan_get_nest_level(struct net_device *dev)
877 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
880 static void macvlan_set_lockdep_class(struct net_device *dev)
882 netdev_lockdep_set_classes(dev);
883 lockdep_set_class_and_subclass(&dev->addr_list_lock,
884 &macvlan_netdev_addr_lock_key,
885 macvlan_get_nest_level(dev));
888 static int macvlan_init(struct net_device *dev)
890 struct macvlan_dev *vlan = netdev_priv(dev);
891 const struct net_device *lowerdev = vlan->lowerdev;
892 struct macvlan_port *port = vlan->port;
894 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
895 (lowerdev->state & MACVLAN_STATE_MASK);
896 dev->features = lowerdev->features & MACVLAN_FEATURES;
897 dev->features |= ALWAYS_ON_FEATURES;
898 dev->hw_features |= NETIF_F_LRO;
899 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
900 dev->vlan_features |= ALWAYS_ON_OFFLOADS;
901 dev->hw_enc_features |= dev->features;
902 dev->gso_max_size = lowerdev->gso_max_size;
903 dev->gso_max_segs = lowerdev->gso_max_segs;
904 dev->hard_header_len = lowerdev->hard_header_len;
906 macvlan_set_lockdep_class(dev);
908 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
909 if (!vlan->pcpu_stats)
910 return -ENOMEM;
912 port->count += 1;
914 return 0;
917 static void macvlan_uninit(struct net_device *dev)
919 struct macvlan_dev *vlan = netdev_priv(dev);
920 struct macvlan_port *port = vlan->port;
922 free_percpu(vlan->pcpu_stats);
924 macvlan_flush_sources(port, vlan);
925 port->count -= 1;
926 if (!port->count)
927 macvlan_port_destroy(port->dev);
930 static void macvlan_dev_get_stats64(struct net_device *dev,
931 struct rtnl_link_stats64 *stats)
933 struct macvlan_dev *vlan = netdev_priv(dev);
935 if (vlan->pcpu_stats) {
936 struct vlan_pcpu_stats *p;
937 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
938 u32 rx_errors = 0, tx_dropped = 0;
939 unsigned int start;
940 int i;
942 for_each_possible_cpu(i) {
943 p = per_cpu_ptr(vlan->pcpu_stats, i);
944 do {
945 start = u64_stats_fetch_begin_irq(&p->syncp);
946 rx_packets = p->rx_packets;
947 rx_bytes = p->rx_bytes;
948 rx_multicast = p->rx_multicast;
949 tx_packets = p->tx_packets;
950 tx_bytes = p->tx_bytes;
951 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
953 stats->rx_packets += rx_packets;
954 stats->rx_bytes += rx_bytes;
955 stats->multicast += rx_multicast;
956 stats->tx_packets += tx_packets;
957 stats->tx_bytes += tx_bytes;
958 /* rx_errors & tx_dropped are u32, updated
959 * without syncp protection.
961 rx_errors += p->rx_errors;
962 tx_dropped += p->tx_dropped;
964 stats->rx_errors = rx_errors;
965 stats->rx_dropped = rx_errors;
966 stats->tx_dropped = tx_dropped;
970 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
971 __be16 proto, u16 vid)
973 struct macvlan_dev *vlan = netdev_priv(dev);
974 struct net_device *lowerdev = vlan->lowerdev;
976 return vlan_vid_add(lowerdev, proto, vid);
979 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
980 __be16 proto, u16 vid)
982 struct macvlan_dev *vlan = netdev_priv(dev);
983 struct net_device *lowerdev = vlan->lowerdev;
985 vlan_vid_del(lowerdev, proto, vid);
986 return 0;
989 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
990 struct net_device *dev,
991 const unsigned char *addr, u16 vid,
992 u16 flags,
993 struct netlink_ext_ack *extack)
995 struct macvlan_dev *vlan = netdev_priv(dev);
996 int err = -EINVAL;
998 /* Support unicast filter only on passthru devices.
999 * Multicast filter should be allowed on all devices.
1001 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1002 return -EOPNOTSUPP;
1004 if (flags & NLM_F_REPLACE)
1005 return -EOPNOTSUPP;
1007 if (is_unicast_ether_addr(addr))
1008 err = dev_uc_add_excl(dev, addr);
1009 else if (is_multicast_ether_addr(addr))
1010 err = dev_mc_add_excl(dev, addr);
1012 return err;
1015 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1016 struct net_device *dev,
1017 const unsigned char *addr, u16 vid)
1019 struct macvlan_dev *vlan = netdev_priv(dev);
1020 int err = -EINVAL;
1022 /* Support unicast filter only on passthru devices.
1023 * Multicast filter should be allowed on all devices.
1025 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1026 return -EOPNOTSUPP;
1028 if (is_unicast_ether_addr(addr))
1029 err = dev_uc_del(dev, addr);
1030 else if (is_multicast_ether_addr(addr))
1031 err = dev_mc_del(dev, addr);
1033 return err;
1036 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1037 struct ethtool_drvinfo *drvinfo)
1039 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1040 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1043 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1044 struct ethtool_link_ksettings *cmd)
1046 const struct macvlan_dev *vlan = netdev_priv(dev);
1048 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1051 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1052 struct ethtool_ts_info *info)
1054 struct net_device *real_dev = macvlan_dev_real_dev(dev);
1055 const struct ethtool_ops *ops = real_dev->ethtool_ops;
1056 struct phy_device *phydev = real_dev->phydev;
1058 if (phydev && phydev->drv && phydev->drv->ts_info) {
1059 return phydev->drv->ts_info(phydev, info);
1060 } else if (ops->get_ts_info) {
1061 return ops->get_ts_info(real_dev, info);
1062 } else {
1063 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1064 SOF_TIMESTAMPING_SOFTWARE;
1065 info->phc_index = -1;
1068 return 0;
1071 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1072 netdev_features_t features)
1074 struct macvlan_dev *vlan = netdev_priv(dev);
1075 netdev_features_t lowerdev_features = vlan->lowerdev->features;
1076 netdev_features_t mask;
1078 features |= NETIF_F_ALL_FOR_ALL;
1079 features &= (vlan->set_features | ~MACVLAN_FEATURES);
1080 mask = features;
1082 lowerdev_features &= (features | ~NETIF_F_LRO);
1083 features = netdev_increment_features(lowerdev_features, features, mask);
1084 features |= ALWAYS_ON_FEATURES;
1085 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1087 return features;
1090 #ifdef CONFIG_NET_POLL_CONTROLLER
1091 static void macvlan_dev_poll_controller(struct net_device *dev)
1093 return;
1096 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1098 struct macvlan_dev *vlan = netdev_priv(dev);
1099 struct net_device *real_dev = vlan->lowerdev;
1100 struct netpoll *netpoll;
1101 int err = 0;
1103 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1104 err = -ENOMEM;
1105 if (!netpoll)
1106 goto out;
1108 err = __netpoll_setup(netpoll, real_dev);
1109 if (err) {
1110 kfree(netpoll);
1111 goto out;
1114 vlan->netpoll = netpoll;
1116 out:
1117 return err;
1120 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1122 struct macvlan_dev *vlan = netdev_priv(dev);
1123 struct netpoll *netpoll = vlan->netpoll;
1125 if (!netpoll)
1126 return;
1128 vlan->netpoll = NULL;
1130 __netpoll_free(netpoll);
1132 #endif /* CONFIG_NET_POLL_CONTROLLER */
1134 static int macvlan_dev_get_iflink(const struct net_device *dev)
1136 struct macvlan_dev *vlan = netdev_priv(dev);
1138 return vlan->lowerdev->ifindex;
1141 static const struct ethtool_ops macvlan_ethtool_ops = {
1142 .get_link = ethtool_op_get_link,
1143 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1144 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1145 .get_ts_info = macvlan_ethtool_get_ts_info,
1148 static const struct net_device_ops macvlan_netdev_ops = {
1149 .ndo_init = macvlan_init,
1150 .ndo_uninit = macvlan_uninit,
1151 .ndo_open = macvlan_open,
1152 .ndo_stop = macvlan_stop,
1153 .ndo_start_xmit = macvlan_start_xmit,
1154 .ndo_change_mtu = macvlan_change_mtu,
1155 .ndo_do_ioctl = macvlan_do_ioctl,
1156 .ndo_fix_features = macvlan_fix_features,
1157 .ndo_change_rx_flags = macvlan_change_rx_flags,
1158 .ndo_set_mac_address = macvlan_set_mac_address,
1159 .ndo_set_rx_mode = macvlan_set_mac_lists,
1160 .ndo_get_stats64 = macvlan_dev_get_stats64,
1161 .ndo_validate_addr = eth_validate_addr,
1162 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1163 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1164 .ndo_fdb_add = macvlan_fdb_add,
1165 .ndo_fdb_del = macvlan_fdb_del,
1166 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1167 .ndo_get_lock_subclass = macvlan_get_nest_level,
1168 #ifdef CONFIG_NET_POLL_CONTROLLER
1169 .ndo_poll_controller = macvlan_dev_poll_controller,
1170 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1171 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1172 #endif
1173 .ndo_get_iflink = macvlan_dev_get_iflink,
1174 .ndo_features_check = passthru_features_check,
1175 .ndo_change_proto_down = dev_change_proto_down_generic,
1178 void macvlan_common_setup(struct net_device *dev)
1180 ether_setup(dev);
1182 dev->min_mtu = 0;
1183 dev->max_mtu = ETH_MAX_MTU;
1184 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1185 netif_keep_dst(dev);
1186 dev->priv_flags |= IFF_UNICAST_FLT;
1187 dev->netdev_ops = &macvlan_netdev_ops;
1188 dev->needs_free_netdev = true;
1189 dev->header_ops = &macvlan_hard_header_ops;
1190 dev->ethtool_ops = &macvlan_ethtool_ops;
1192 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1194 static void macvlan_setup(struct net_device *dev)
1196 macvlan_common_setup(dev);
1197 dev->priv_flags |= IFF_NO_QUEUE;
1200 static int macvlan_port_create(struct net_device *dev)
1202 struct macvlan_port *port;
1203 unsigned int i;
1204 int err;
1206 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1207 return -EINVAL;
1209 if (netdev_is_rx_handler_busy(dev))
1210 return -EBUSY;
1212 port = kzalloc(sizeof(*port), GFP_KERNEL);
1213 if (port == NULL)
1214 return -ENOMEM;
1216 port->dev = dev;
1217 ether_addr_copy(port->perm_addr, dev->dev_addr);
1218 INIT_LIST_HEAD(&port->vlans);
1219 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1220 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1221 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1222 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1224 skb_queue_head_init(&port->bc_queue);
1225 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1227 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1228 if (err)
1229 kfree(port);
1230 else
1231 dev->priv_flags |= IFF_MACVLAN_PORT;
1232 return err;
1235 static void macvlan_port_destroy(struct net_device *dev)
1237 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1238 struct sk_buff *skb;
1240 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1241 netdev_rx_handler_unregister(dev);
1243 /* After this point, no packet can schedule bc_work anymore,
1244 * but we need to cancel it and purge left skbs if any.
1246 cancel_work_sync(&port->bc_work);
1248 while ((skb = __skb_dequeue(&port->bc_queue))) {
1249 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1251 if (src)
1252 dev_put(src->dev);
1254 kfree_skb(skb);
1257 /* If the lower device address has been changed by passthru
1258 * macvlan, put it back.
1260 if (macvlan_passthru(port) &&
1261 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1262 struct sockaddr sa;
1264 sa.sa_family = port->dev->type;
1265 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1266 dev_set_mac_address(port->dev, &sa, NULL);
1269 kfree(port);
1272 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1273 struct netlink_ext_ack *extack)
1275 if (tb[IFLA_ADDRESS]) {
1276 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1277 return -EINVAL;
1278 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1279 return -EADDRNOTAVAIL;
1282 if (!data)
1283 return 0;
1285 if (data[IFLA_MACVLAN_FLAGS] &&
1286 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1287 return -EINVAL;
1289 if (data[IFLA_MACVLAN_MODE]) {
1290 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1291 case MACVLAN_MODE_PRIVATE:
1292 case MACVLAN_MODE_VEPA:
1293 case MACVLAN_MODE_BRIDGE:
1294 case MACVLAN_MODE_PASSTHRU:
1295 case MACVLAN_MODE_SOURCE:
1296 break;
1297 default:
1298 return -EINVAL;
1302 if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1303 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1304 case MACVLAN_MACADDR_ADD:
1305 case MACVLAN_MACADDR_DEL:
1306 case MACVLAN_MACADDR_FLUSH:
1307 case MACVLAN_MACADDR_SET:
1308 break;
1309 default:
1310 return -EINVAL;
1314 if (data[IFLA_MACVLAN_MACADDR]) {
1315 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1316 return -EINVAL;
1318 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1319 return -EADDRNOTAVAIL;
1322 if (data[IFLA_MACVLAN_MACADDR_COUNT])
1323 return -EINVAL;
1325 return 0;
1329 * reconfigure list of remote source mac address
1330 * (only for macvlan devices in source mode)
1331 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1332 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1334 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1335 struct nlattr *data[])
1337 char *addr = NULL;
1338 int ret, rem, len;
1339 struct nlattr *nla, *head;
1340 struct macvlan_source_entry *entry;
1342 if (data[IFLA_MACVLAN_MACADDR])
1343 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1345 if (mode == MACVLAN_MACADDR_ADD) {
1346 if (!addr)
1347 return -EINVAL;
1349 return macvlan_hash_add_source(vlan, addr);
1351 } else if (mode == MACVLAN_MACADDR_DEL) {
1352 if (!addr)
1353 return -EINVAL;
1355 entry = macvlan_hash_lookup_source(vlan, addr);
1356 if (entry) {
1357 macvlan_hash_del_source(entry);
1358 vlan->macaddr_count--;
1360 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1361 macvlan_flush_sources(vlan->port, vlan);
1362 } else if (mode == MACVLAN_MACADDR_SET) {
1363 macvlan_flush_sources(vlan->port, vlan);
1365 if (addr) {
1366 ret = macvlan_hash_add_source(vlan, addr);
1367 if (ret)
1368 return ret;
1371 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1372 return 0;
1374 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1375 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1377 nla_for_each_attr(nla, head, len, rem) {
1378 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1379 nla_len(nla) != ETH_ALEN)
1380 continue;
1382 addr = nla_data(nla);
1383 ret = macvlan_hash_add_source(vlan, addr);
1384 if (ret)
1385 return ret;
1387 } else {
1388 return -EINVAL;
1391 return 0;
1394 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1395 struct nlattr *tb[], struct nlattr *data[],
1396 struct netlink_ext_ack *extack)
1398 struct macvlan_dev *vlan = netdev_priv(dev);
1399 struct macvlan_port *port;
1400 struct net_device *lowerdev;
1401 int err;
1402 int macmode;
1403 bool create = false;
1405 if (!tb[IFLA_LINK])
1406 return -EINVAL;
1408 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1409 if (lowerdev == NULL)
1410 return -ENODEV;
1412 /* When creating macvlans or macvtaps on top of other macvlans - use
1413 * the real device as the lowerdev.
1415 if (netif_is_macvlan(lowerdev))
1416 lowerdev = macvlan_dev_real_dev(lowerdev);
1418 if (!tb[IFLA_MTU])
1419 dev->mtu = lowerdev->mtu;
1420 else if (dev->mtu > lowerdev->mtu)
1421 return -EINVAL;
1423 /* MTU range: 68 - lowerdev->max_mtu */
1424 dev->min_mtu = ETH_MIN_MTU;
1425 dev->max_mtu = lowerdev->max_mtu;
1427 if (!tb[IFLA_ADDRESS])
1428 eth_hw_addr_random(dev);
1430 if (!netif_is_macvlan_port(lowerdev)) {
1431 err = macvlan_port_create(lowerdev);
1432 if (err < 0)
1433 return err;
1434 create = true;
1436 port = macvlan_port_get_rtnl(lowerdev);
1438 /* Only 1 macvlan device can be created in passthru mode */
1439 if (macvlan_passthru(port)) {
1440 /* The macvlan port must be not created this time,
1441 * still goto destroy_macvlan_port for readability.
1443 err = -EINVAL;
1444 goto destroy_macvlan_port;
1447 vlan->lowerdev = lowerdev;
1448 vlan->dev = dev;
1449 vlan->port = port;
1450 vlan->set_features = MACVLAN_FEATURES;
1451 vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1453 vlan->mode = MACVLAN_MODE_VEPA;
1454 if (data && data[IFLA_MACVLAN_MODE])
1455 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1457 if (data && data[IFLA_MACVLAN_FLAGS])
1458 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1460 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1461 if (port->count) {
1462 err = -EINVAL;
1463 goto destroy_macvlan_port;
1465 macvlan_set_passthru(port);
1466 eth_hw_addr_inherit(dev, lowerdev);
1469 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1470 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1471 err = -EINVAL;
1472 goto destroy_macvlan_port;
1474 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1475 err = macvlan_changelink_sources(vlan, macmode, data);
1476 if (err)
1477 goto destroy_macvlan_port;
1480 err = register_netdevice(dev);
1481 if (err < 0)
1482 goto destroy_macvlan_port;
1484 dev->priv_flags |= IFF_MACVLAN;
1485 err = netdev_upper_dev_link(lowerdev, dev, extack);
1486 if (err)
1487 goto unregister_netdev;
1489 list_add_tail_rcu(&vlan->list, &port->vlans);
1490 netif_stacked_transfer_operstate(lowerdev, dev);
1491 linkwatch_fire_event(dev);
1493 return 0;
1495 unregister_netdev:
1496 /* macvlan_uninit would free the macvlan port */
1497 unregister_netdevice(dev);
1498 return err;
1499 destroy_macvlan_port:
1500 /* the macvlan port may be freed by macvlan_uninit when fail to register.
1501 * so we destroy the macvlan port only when it's valid.
1503 if (create && macvlan_port_get_rtnl(lowerdev))
1504 macvlan_port_destroy(port->dev);
1505 return err;
1507 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1509 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1510 struct nlattr *tb[], struct nlattr *data[],
1511 struct netlink_ext_ack *extack)
1513 return macvlan_common_newlink(src_net, dev, tb, data, extack);
1516 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1518 struct macvlan_dev *vlan = netdev_priv(dev);
1520 if (vlan->mode == MACVLAN_MODE_SOURCE)
1521 macvlan_flush_sources(vlan->port, vlan);
1522 list_del_rcu(&vlan->list);
1523 unregister_netdevice_queue(dev, head);
1524 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1526 EXPORT_SYMBOL_GPL(macvlan_dellink);
1528 static int macvlan_changelink(struct net_device *dev,
1529 struct nlattr *tb[], struct nlattr *data[],
1530 struct netlink_ext_ack *extack)
1532 struct macvlan_dev *vlan = netdev_priv(dev);
1533 enum macvlan_mode mode;
1534 bool set_mode = false;
1535 enum macvlan_macaddr_mode macmode;
1536 int ret;
1538 /* Validate mode, but don't set yet: setting flags may fail. */
1539 if (data && data[IFLA_MACVLAN_MODE]) {
1540 set_mode = true;
1541 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1542 /* Passthrough mode can't be set or cleared dynamically */
1543 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1544 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1545 return -EINVAL;
1546 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1547 vlan->mode != mode)
1548 macvlan_flush_sources(vlan->port, vlan);
1551 if (data && data[IFLA_MACVLAN_FLAGS]) {
1552 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1553 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1554 if (macvlan_passthru(vlan->port) && promisc) {
1555 int err;
1557 if (flags & MACVLAN_FLAG_NOPROMISC)
1558 err = dev_set_promiscuity(vlan->lowerdev, -1);
1559 else
1560 err = dev_set_promiscuity(vlan->lowerdev, 1);
1561 if (err < 0)
1562 return err;
1564 vlan->flags = flags;
1566 if (set_mode)
1567 vlan->mode = mode;
1568 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1569 if (vlan->mode != MACVLAN_MODE_SOURCE)
1570 return -EINVAL;
1571 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1572 ret = macvlan_changelink_sources(vlan, macmode, data);
1573 if (ret)
1574 return ret;
1576 return 0;
1579 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1581 if (vlan->macaddr_count == 0)
1582 return 0;
1583 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1584 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1587 static size_t macvlan_get_size(const struct net_device *dev)
1589 struct macvlan_dev *vlan = netdev_priv(dev);
1591 return (0
1592 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1593 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1594 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1595 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1599 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1600 const struct macvlan_dev *vlan,
1601 const int i)
1603 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1604 struct macvlan_source_entry *entry;
1606 hlist_for_each_entry_rcu(entry, h, hlist) {
1607 if (entry->vlan != vlan)
1608 continue;
1609 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1610 return 1;
1612 return 0;
1615 static int macvlan_fill_info(struct sk_buff *skb,
1616 const struct net_device *dev)
1618 struct macvlan_dev *vlan = netdev_priv(dev);
1619 int i;
1620 struct nlattr *nest;
1622 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1623 goto nla_put_failure;
1624 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1625 goto nla_put_failure;
1626 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1627 goto nla_put_failure;
1628 if (vlan->macaddr_count > 0) {
1629 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1630 if (nest == NULL)
1631 goto nla_put_failure;
1633 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1634 if (macvlan_fill_info_macaddr(skb, vlan, i))
1635 goto nla_put_failure;
1637 nla_nest_end(skb, nest);
1639 return 0;
1641 nla_put_failure:
1642 return -EMSGSIZE;
1645 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1646 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1647 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1648 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1649 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1650 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1651 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1654 int macvlan_link_register(struct rtnl_link_ops *ops)
1656 /* common fields */
1657 ops->validate = macvlan_validate;
1658 ops->maxtype = IFLA_MACVLAN_MAX;
1659 ops->policy = macvlan_policy;
1660 ops->changelink = macvlan_changelink;
1661 ops->get_size = macvlan_get_size;
1662 ops->fill_info = macvlan_fill_info;
1664 return rtnl_link_register(ops);
1666 EXPORT_SYMBOL_GPL(macvlan_link_register);
1668 static struct net *macvlan_get_link_net(const struct net_device *dev)
1670 return dev_net(macvlan_dev_real_dev(dev));
1673 static struct rtnl_link_ops macvlan_link_ops = {
1674 .kind = "macvlan",
1675 .setup = macvlan_setup,
1676 .newlink = macvlan_newlink,
1677 .dellink = macvlan_dellink,
1678 .get_link_net = macvlan_get_link_net,
1679 .priv_size = sizeof(struct macvlan_dev),
1682 static int macvlan_device_event(struct notifier_block *unused,
1683 unsigned long event, void *ptr)
1685 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1686 struct macvlan_dev *vlan, *next;
1687 struct macvlan_port *port;
1688 LIST_HEAD(list_kill);
1690 if (!netif_is_macvlan_port(dev))
1691 return NOTIFY_DONE;
1693 port = macvlan_port_get_rtnl(dev);
1695 switch (event) {
1696 case NETDEV_UP:
1697 case NETDEV_DOWN:
1698 case NETDEV_CHANGE:
1699 list_for_each_entry(vlan, &port->vlans, list)
1700 netif_stacked_transfer_operstate(vlan->lowerdev,
1701 vlan->dev);
1702 break;
1703 case NETDEV_FEAT_CHANGE:
1704 list_for_each_entry(vlan, &port->vlans, list) {
1705 vlan->dev->gso_max_size = dev->gso_max_size;
1706 vlan->dev->gso_max_segs = dev->gso_max_segs;
1707 netdev_update_features(vlan->dev);
1709 break;
1710 case NETDEV_CHANGEMTU:
1711 list_for_each_entry(vlan, &port->vlans, list) {
1712 if (vlan->dev->mtu <= dev->mtu)
1713 continue;
1714 dev_set_mtu(vlan->dev, dev->mtu);
1716 break;
1717 case NETDEV_CHANGEADDR:
1718 if (!macvlan_passthru(port))
1719 return NOTIFY_DONE;
1721 vlan = list_first_entry_or_null(&port->vlans,
1722 struct macvlan_dev,
1723 list);
1725 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1726 return NOTIFY_BAD;
1728 break;
1729 case NETDEV_UNREGISTER:
1730 /* twiddle thumbs on netns device moves */
1731 if (dev->reg_state != NETREG_UNREGISTERING)
1732 break;
1734 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1735 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1736 unregister_netdevice_many(&list_kill);
1737 break;
1738 case NETDEV_PRE_TYPE_CHANGE:
1739 /* Forbid underlaying device to change its type. */
1740 return NOTIFY_BAD;
1742 case NETDEV_NOTIFY_PEERS:
1743 case NETDEV_BONDING_FAILOVER:
1744 case NETDEV_RESEND_IGMP:
1745 /* Propagate to all vlans */
1746 list_for_each_entry(vlan, &port->vlans, list)
1747 call_netdevice_notifiers(event, vlan->dev);
1749 return NOTIFY_DONE;
1752 static struct notifier_block macvlan_notifier_block __read_mostly = {
1753 .notifier_call = macvlan_device_event,
1756 static int __init macvlan_init_module(void)
1758 int err;
1760 register_netdevice_notifier(&macvlan_notifier_block);
1762 err = macvlan_link_register(&macvlan_link_ops);
1763 if (err < 0)
1764 goto err1;
1765 return 0;
1766 err1:
1767 unregister_netdevice_notifier(&macvlan_notifier_block);
1768 return err;
1771 static void __exit macvlan_cleanup_module(void)
1773 rtnl_link_unregister(&macvlan_link_ops);
1774 unregister_netdevice_notifier(&macvlan_notifier_block);
1777 module_init(macvlan_init_module);
1778 module_exit(macvlan_cleanup_module);
1780 MODULE_LICENSE("GPL");
1781 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1782 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1783 MODULE_ALIAS_RTNL_LINK("macvlan");