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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
4 *
5 * The code this is based on carried the following copyright notice:
6 * ---
7 * (C) Copyright 2001-2006
8 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
9 * Re-worked by Ben Greear <greearb@candelatech.com>
10 * ---
11 */
12#include <linux/kernel.h>
13#include <linux/types.h>
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/errno.h>
17#include <linux/slab.h>
18#include <linux/string.h>
19#include <linux/rculist.h>
20#include <linux/notifier.h>
21#include <linux/netdevice.h>
22#include <linux/etherdevice.h>
23#include <linux/net_tstamp.h>
24#include <linux/ethtool.h>
25#include <linux/if_arp.h>
26#include <linux/if_vlan.h>
27#include <linux/if_link.h>
28#include <linux/if_macvlan.h>
29#include <linux/hash.h>
30#include <linux/workqueue.h>
31#include <net/rtnetlink.h>
32#include <net/xfrm.h>
33#include <linux/netpoll.h>
34#include <linux/phy.h>
35
36#define MACVLAN_HASH_BITS 8
37#define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS)
38#define MACVLAN_DEFAULT_BC_QUEUE_LEN 1000
39
40#define MACVLAN_F_PASSTHRU 1
41#define MACVLAN_F_ADDRCHANGE 2
42
43struct macvlan_port {
44 struct net_device *dev;
45 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
46 struct list_head vlans;
47 struct sk_buff_head bc_queue;
48 struct work_struct bc_work;
49 u32 bc_queue_len_used;
50 int bc_cutoff;
51 u32 flags;
52 int count;
53 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
54 DECLARE_BITMAP(bc_filter, MACVLAN_MC_FILTER_SZ);
55 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
56 unsigned char perm_addr[ETH_ALEN];
57};
58
59struct macvlan_source_entry {
60 struct hlist_node hlist;
61 struct macvlan_dev *vlan;
62 unsigned char addr[6+2] __aligned(sizeof(u16));
63 struct rcu_head rcu;
64};
65
66struct macvlan_skb_cb {
67 const struct macvlan_dev *src;
68};
69
70#define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
71
72static void macvlan_port_destroy(struct net_device *dev);
73static void update_port_bc_queue_len(struct macvlan_port *port);
74
75static inline bool macvlan_passthru(const struct macvlan_port *port)
76{
77 return port->flags & MACVLAN_F_PASSTHRU;
78}
79
80static inline void macvlan_set_passthru(struct macvlan_port *port)
81{
82 port->flags |= MACVLAN_F_PASSTHRU;
83}
84
85static inline bool macvlan_addr_change(const struct macvlan_port *port)
86{
87 return port->flags & MACVLAN_F_ADDRCHANGE;
88}
89
90static inline void macvlan_set_addr_change(struct macvlan_port *port)
91{
92 port->flags |= MACVLAN_F_ADDRCHANGE;
93}
94
95static inline void macvlan_clear_addr_change(struct macvlan_port *port)
96{
97 port->flags &= ~MACVLAN_F_ADDRCHANGE;
98}
99
100/* Hash Ethernet address */
101static u32 macvlan_eth_hash(const unsigned char *addr)
102{
103 u64 value = get_unaligned((u64 *)addr);
104
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);
112}
113
114static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
115{
116 return rcu_dereference(dev->rx_handler_data);
117}
118
119static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
120{
121 return rtnl_dereference(dev->rx_handler_data);
122}
123
124static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
125 const unsigned char *addr)
126{
127 struct macvlan_dev *vlan;
128 u32 idx = macvlan_eth_hash(addr);
129
130 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist,
131 lockdep_rtnl_is_held()) {
132 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
133 return vlan;
134 }
135 return NULL;
136}
137
138static struct macvlan_source_entry *macvlan_hash_lookup_source(
139 const struct macvlan_dev *vlan,
140 const unsigned char *addr)
141{
142 struct macvlan_source_entry *entry;
143 u32 idx = macvlan_eth_hash(addr);
144 struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
145
146 hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) {
147 if (ether_addr_equal_64bits(entry->addr, addr) &&
148 entry->vlan == vlan)
149 return entry;
150 }
151 return NULL;
152}
153
154static int macvlan_hash_add_source(struct macvlan_dev *vlan,
155 const unsigned char *addr)
156{
157 struct macvlan_port *port = vlan->port;
158 struct macvlan_source_entry *entry;
159 struct hlist_head *h;
160
161 entry = macvlan_hash_lookup_source(vlan, addr);
162 if (entry)
163 return 0;
164
165 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
166 if (!entry)
167 return -ENOMEM;
168
169 ether_addr_copy(entry->addr, addr);
170 entry->vlan = vlan;
171 h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
172 hlist_add_head_rcu(&entry->hlist, h);
173 vlan->macaddr_count++;
174
175 return 0;
176}
177
178static void macvlan_hash_add(struct macvlan_dev *vlan)
179{
180 struct macvlan_port *port = vlan->port;
181 const unsigned char *addr = vlan->dev->dev_addr;
182 u32 idx = macvlan_eth_hash(addr);
183
184 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
185}
186
187static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
188{
189 hlist_del_rcu(&entry->hlist);
190 kfree_rcu(entry, rcu);
191}
192
193static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
194{
195 hlist_del_rcu(&vlan->hlist);
196 if (sync)
197 synchronize_rcu();
198}
199
200static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
201 const unsigned char *addr)
202{
203 macvlan_hash_del(vlan, true);
204 /* Now that we are unhashed it is safe to change the device
205 * address without confusing packet delivery.
206 */
207 eth_hw_addr_set(vlan->dev, addr);
208 macvlan_hash_add(vlan);
209}
210
211static bool macvlan_addr_busy(const struct macvlan_port *port,
212 const unsigned char *addr)
213{
214 /* Test to see if the specified address is
215 * currently in use by the underlying device or
216 * another macvlan.
217 */
218 if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
219 ether_addr_equal_64bits(port->dev->dev_addr, addr))
220 return true;
221
222 if (macvlan_hash_lookup(port, addr))
223 return true;
224
225 return false;
226}
227
228
229static int macvlan_broadcast_one(struct sk_buff *skb,
230 const struct macvlan_dev *vlan,
231 const struct ethhdr *eth, bool local)
232{
233 struct net_device *dev = vlan->dev;
234
235 if (local)
236 return __dev_forward_skb(dev, skb);
237
238 skb->dev = dev;
239 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
240 skb->pkt_type = PACKET_BROADCAST;
241 else
242 skb->pkt_type = PACKET_MULTICAST;
243
244 return 0;
245}
246
247static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
248{
249 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
250}
251
252
253static unsigned int mc_hash(const struct macvlan_dev *vlan,
254 const unsigned char *addr)
255{
256 u32 val = __get_unaligned_cpu32(addr + 2);
257
258 val ^= macvlan_hash_mix(vlan);
259 return hash_32(val, MACVLAN_MC_FILTER_BITS);
260}
261
262static void macvlan_broadcast(struct sk_buff *skb,
263 const struct macvlan_port *port,
264 struct net_device *src,
265 enum macvlan_mode mode)
266{
267 const struct ethhdr *eth = eth_hdr(skb);
268 const struct macvlan_dev *vlan;
269 struct sk_buff *nskb;
270 unsigned int i;
271 int err;
272 unsigned int hash;
273
274 if (skb->protocol == htons(ETH_P_PAUSE))
275 return;
276
277 hash_for_each_rcu(port->vlan_hash, i, vlan, hlist) {
278 if (vlan->dev == src || !(vlan->mode & mode))
279 continue;
280
281 hash = mc_hash(vlan, eth->h_dest);
282 if (!test_bit(hash, vlan->mc_filter))
283 continue;
284
285 err = NET_RX_DROP;
286 nskb = skb_clone(skb, GFP_ATOMIC);
287 if (likely(nskb))
288 err = macvlan_broadcast_one(nskb, vlan, eth,
289 mode == MACVLAN_MODE_BRIDGE) ?:
290 netif_rx(nskb);
291 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
292 err == NET_RX_SUCCESS, true);
293 }
294}
295
296static void macvlan_multicast_rx(const struct macvlan_port *port,
297 const struct macvlan_dev *src,
298 struct sk_buff *skb)
299{
300 if (!src)
301 /* frame comes from an external address */
302 macvlan_broadcast(skb, port, NULL,
303 MACVLAN_MODE_PRIVATE |
304 MACVLAN_MODE_VEPA |
305 MACVLAN_MODE_PASSTHRU|
306 MACVLAN_MODE_BRIDGE);
307 else if (src->mode == MACVLAN_MODE_VEPA)
308 /* flood to everyone except source */
309 macvlan_broadcast(skb, port, src->dev,
310 MACVLAN_MODE_VEPA |
311 MACVLAN_MODE_BRIDGE);
312 else
313 /*
314 * flood only to VEPA ports, bridge ports
315 * already saw the frame on the way out.
316 */
317 macvlan_broadcast(skb, port, src->dev,
318 MACVLAN_MODE_VEPA);
319}
320
321static void macvlan_process_broadcast(struct work_struct *w)
322{
323 struct macvlan_port *port = container_of(w, struct macvlan_port,
324 bc_work);
325 struct sk_buff *skb;
326 struct sk_buff_head list;
327
328 __skb_queue_head_init(&list);
329
330 spin_lock_bh(&port->bc_queue.lock);
331 skb_queue_splice_tail_init(&port->bc_queue, &list);
332 spin_unlock_bh(&port->bc_queue.lock);
333
334 while ((skb = __skb_dequeue(&list))) {
335 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
336
337 rcu_read_lock();
338 macvlan_multicast_rx(port, src, skb);
339 rcu_read_unlock();
340
341 if (src)
342 dev_put(src->dev);
343 consume_skb(skb);
344
345 cond_resched();
346 }
347}
348
349static void macvlan_broadcast_enqueue(struct macvlan_port *port,
350 const struct macvlan_dev *src,
351 struct sk_buff *skb)
352{
353 struct sk_buff *nskb;
354 int err = -ENOMEM;
355
356 nskb = skb_clone(skb, GFP_ATOMIC);
357 if (!nskb)
358 goto err;
359
360 MACVLAN_SKB_CB(nskb)->src = src;
361
362 spin_lock(&port->bc_queue.lock);
363 if (skb_queue_len(&port->bc_queue) < port->bc_queue_len_used) {
364 if (src)
365 dev_hold(src->dev);
366 __skb_queue_tail(&port->bc_queue, nskb);
367 err = 0;
368 }
369 spin_unlock(&port->bc_queue.lock);
370
371 queue_work(system_unbound_wq, &port->bc_work);
372
373 if (err)
374 goto free_nskb;
375
376 return;
377
378free_nskb:
379 kfree_skb(nskb);
380err:
381 dev_core_stats_rx_dropped_inc(skb->dev);
382}
383
384static void macvlan_flush_sources(struct macvlan_port *port,
385 struct macvlan_dev *vlan)
386{
387 struct macvlan_source_entry *entry;
388 struct hlist_node *next;
389 int i;
390
391 hash_for_each_safe(port->vlan_source_hash, i, next, entry, hlist)
392 if (entry->vlan == vlan)
393 macvlan_hash_del_source(entry);
394
395 vlan->macaddr_count = 0;
396}
397
398static void macvlan_forward_source_one(struct sk_buff *skb,
399 struct macvlan_dev *vlan)
400{
401 struct sk_buff *nskb;
402 struct net_device *dev;
403 int len;
404 int ret;
405
406 dev = vlan->dev;
407 if (unlikely(!(dev->flags & IFF_UP)))
408 return;
409
410 nskb = skb_clone(skb, GFP_ATOMIC);
411 if (!nskb)
412 return;
413
414 len = nskb->len + ETH_HLEN;
415 nskb->dev = dev;
416
417 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
418 nskb->pkt_type = PACKET_HOST;
419
420 ret = __netif_rx(nskb);
421 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
422}
423
424static bool macvlan_forward_source(struct sk_buff *skb,
425 struct macvlan_port *port,
426 const unsigned char *addr)
427{
428 struct macvlan_source_entry *entry;
429 u32 idx = macvlan_eth_hash(addr);
430 struct hlist_head *h = &port->vlan_source_hash[idx];
431 bool consume = false;
432
433 hlist_for_each_entry_rcu(entry, h, hlist) {
434 if (ether_addr_equal_64bits(entry->addr, addr)) {
435 if (entry->vlan->flags & MACVLAN_FLAG_NODST)
436 consume = true;
437 macvlan_forward_source_one(skb, entry->vlan);
438 }
439 }
440
441 return consume;
442}
443
444/* called under rcu_read_lock() from netif_receive_skb */
445static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
446{
447 struct macvlan_port *port;
448 struct sk_buff *skb = *pskb;
449 const struct ethhdr *eth = eth_hdr(skb);
450 const struct macvlan_dev *vlan;
451 const struct macvlan_dev *src;
452 struct net_device *dev;
453 unsigned int len = 0;
454 int ret;
455 rx_handler_result_t handle_res;
456
457 /* Packets from dev_loopback_xmit() do not have L2 header, bail out */
458 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
459 return RX_HANDLER_PASS;
460
461 port = macvlan_port_get_rcu(skb->dev);
462 if (is_multicast_ether_addr(eth->h_dest)) {
463 unsigned int hash;
464
465 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
466 if (!skb)
467 return RX_HANDLER_CONSUMED;
468 *pskb = skb;
469 eth = eth_hdr(skb);
470 if (macvlan_forward_source(skb, port, eth->h_source)) {
471 kfree_skb(skb);
472 return RX_HANDLER_CONSUMED;
473 }
474 src = macvlan_hash_lookup(port, eth->h_source);
475 if (src && src->mode != MACVLAN_MODE_VEPA &&
476 src->mode != MACVLAN_MODE_BRIDGE) {
477 /* forward to original port. */
478 vlan = src;
479 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
480 __netif_rx(skb);
481 handle_res = RX_HANDLER_CONSUMED;
482 goto out;
483 }
484
485 hash = mc_hash(NULL, eth->h_dest);
486 if (test_bit(hash, port->bc_filter))
487 macvlan_broadcast_enqueue(port, src, skb);
488 else if (test_bit(hash, port->mc_filter))
489 macvlan_multicast_rx(port, src, skb);
490
491 return RX_HANDLER_PASS;
492 }
493
494 if (macvlan_forward_source(skb, port, eth->h_source)) {
495 kfree_skb(skb);
496 return RX_HANDLER_CONSUMED;
497 }
498 if (macvlan_passthru(port))
499 vlan = list_first_or_null_rcu(&port->vlans,
500 struct macvlan_dev, list);
501 else
502 vlan = macvlan_hash_lookup(port, eth->h_dest);
503 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
504 return RX_HANDLER_PASS;
505
506 dev = vlan->dev;
507 if (unlikely(!(dev->flags & IFF_UP))) {
508 kfree_skb(skb);
509 return RX_HANDLER_CONSUMED;
510 }
511 len = skb->len + ETH_HLEN;
512 skb = skb_share_check(skb, GFP_ATOMIC);
513 if (!skb) {
514 ret = NET_RX_DROP;
515 handle_res = RX_HANDLER_CONSUMED;
516 goto out;
517 }
518
519 *pskb = skb;
520 skb->dev = dev;
521 skb->pkt_type = PACKET_HOST;
522
523 ret = NET_RX_SUCCESS;
524 handle_res = RX_HANDLER_ANOTHER;
525out:
526 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
527 return handle_res;
528}
529
530static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
531{
532 const struct macvlan_dev *vlan = netdev_priv(dev);
533 const struct macvlan_port *port = vlan->port;
534 const struct macvlan_dev *dest;
535
536 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
537 const struct ethhdr *eth = skb_eth_hdr(skb);
538
539 /* send to other bridge ports directly */
540 if (is_multicast_ether_addr(eth->h_dest)) {
541 skb_reset_mac_header(skb);
542 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
543 goto xmit_world;
544 }
545
546 dest = macvlan_hash_lookup(port, eth->h_dest);
547 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
548 /* send to lowerdev first for its network taps */
549 dev_forward_skb(vlan->lowerdev, skb);
550
551 return NET_XMIT_SUCCESS;
552 }
553 }
554xmit_world:
555 skb->dev = vlan->lowerdev;
556 return dev_queue_xmit_accel(skb,
557 netdev_get_sb_channel(dev) ? dev : NULL);
558}
559
560static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
561{
562#ifdef CONFIG_NET_POLL_CONTROLLER
563 return netpoll_send_skb(vlan->netpoll, skb);
564#else
565 BUG();
566 return NETDEV_TX_OK;
567#endif
568}
569
570static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
571 struct net_device *dev)
572{
573 struct macvlan_dev *vlan = netdev_priv(dev);
574 unsigned int len = skb->len;
575 int ret;
576
577 if (unlikely(netpoll_tx_running(dev)))
578 return macvlan_netpoll_send_skb(vlan, skb);
579
580 ret = macvlan_queue_xmit(skb, dev);
581
582 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
583 struct vlan_pcpu_stats *pcpu_stats;
584
585 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
586 u64_stats_update_begin(&pcpu_stats->syncp);
587 u64_stats_inc(&pcpu_stats->tx_packets);
588 u64_stats_add(&pcpu_stats->tx_bytes, len);
589 u64_stats_update_end(&pcpu_stats->syncp);
590 } else {
591 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
592 }
593 return ret;
594}
595
596static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
597 unsigned short type, const void *daddr,
598 const void *saddr, unsigned len)
599{
600 const struct macvlan_dev *vlan = netdev_priv(dev);
601 struct net_device *lowerdev = vlan->lowerdev;
602
603 return dev_hard_header(skb, lowerdev, type, daddr,
604 saddr ? : dev->dev_addr, len);
605}
606
607static const struct header_ops macvlan_hard_header_ops = {
608 .create = macvlan_hard_header,
609 .parse = eth_header_parse,
610 .cache = eth_header_cache,
611 .cache_update = eth_header_cache_update,
612 .parse_protocol = eth_header_parse_protocol,
613};
614
615static int macvlan_open(struct net_device *dev)
616{
617 struct macvlan_dev *vlan = netdev_priv(dev);
618 struct net_device *lowerdev = vlan->lowerdev;
619 int err;
620
621 if (macvlan_passthru(vlan->port)) {
622 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
623 err = dev_set_promiscuity(lowerdev, 1);
624 if (err < 0)
625 goto out;
626 }
627 goto hash_add;
628 }
629
630 err = -EADDRINUSE;
631 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
632 goto out;
633
634 /* Attempt to populate accel_priv which is used to offload the L2
635 * forwarding requests for unicast packets.
636 */
637 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
638 vlan->accel_priv =
639 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
640
641 /* If earlier attempt to offload failed, or accel_priv is not
642 * populated we must add the unicast address to the lower device.
643 */
644 if (IS_ERR_OR_NULL(vlan->accel_priv)) {
645 vlan->accel_priv = NULL;
646 err = dev_uc_add(lowerdev, dev->dev_addr);
647 if (err < 0)
648 goto out;
649 }
650
651 if (dev->flags & IFF_ALLMULTI) {
652 err = dev_set_allmulti(lowerdev, 1);
653 if (err < 0)
654 goto del_unicast;
655 }
656
657 if (dev->flags & IFF_PROMISC) {
658 err = dev_set_promiscuity(lowerdev, 1);
659 if (err < 0)
660 goto clear_multi;
661 }
662
663hash_add:
664 macvlan_hash_add(vlan);
665 return 0;
666
667clear_multi:
668 if (dev->flags & IFF_ALLMULTI)
669 dev_set_allmulti(lowerdev, -1);
670del_unicast:
671 if (vlan->accel_priv) {
672 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
673 vlan->accel_priv);
674 vlan->accel_priv = NULL;
675 } else {
676 dev_uc_del(lowerdev, dev->dev_addr);
677 }
678out:
679 return err;
680}
681
682static int macvlan_stop(struct net_device *dev)
683{
684 struct macvlan_dev *vlan = netdev_priv(dev);
685 struct net_device *lowerdev = vlan->lowerdev;
686
687 if (vlan->accel_priv) {
688 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
689 vlan->accel_priv);
690 vlan->accel_priv = NULL;
691 }
692
693 dev_uc_unsync(lowerdev, dev);
694 dev_mc_unsync(lowerdev, dev);
695
696 if (macvlan_passthru(vlan->port)) {
697 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
698 dev_set_promiscuity(lowerdev, -1);
699 goto hash_del;
700 }
701
702 if (dev->flags & IFF_ALLMULTI)
703 dev_set_allmulti(lowerdev, -1);
704
705 if (dev->flags & IFF_PROMISC)
706 dev_set_promiscuity(lowerdev, -1);
707
708 dev_uc_del(lowerdev, dev->dev_addr);
709
710hash_del:
711 macvlan_hash_del(vlan, !dev->dismantle);
712 return 0;
713}
714
715static int macvlan_sync_address(struct net_device *dev,
716 const unsigned char *addr)
717{
718 struct macvlan_dev *vlan = netdev_priv(dev);
719 struct net_device *lowerdev = vlan->lowerdev;
720 struct macvlan_port *port = vlan->port;
721 int err;
722
723 if (!(dev->flags & IFF_UP)) {
724 /* Just copy in the new address */
725 eth_hw_addr_set(dev, addr);
726 } else {
727 /* Rehash and update the device filters */
728 if (macvlan_addr_busy(vlan->port, addr))
729 return -EADDRINUSE;
730
731 if (!macvlan_passthru(port)) {
732 err = dev_uc_add(lowerdev, addr);
733 if (err)
734 return err;
735
736 dev_uc_del(lowerdev, dev->dev_addr);
737 }
738
739 macvlan_hash_change_addr(vlan, addr);
740 }
741 if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
742 /* Since addr_change isn't set, we are here due to lower
743 * device change. Save the lower-dev address so we can
744 * restore it later.
745 */
746 ether_addr_copy(vlan->port->perm_addr,
747 lowerdev->dev_addr);
748 }
749 macvlan_clear_addr_change(port);
750 return 0;
751}
752
753static int macvlan_set_mac_address(struct net_device *dev, void *p)
754{
755 struct macvlan_dev *vlan = netdev_priv(dev);
756 struct sockaddr *addr = p;
757
758 if (!is_valid_ether_addr(addr->sa_data))
759 return -EADDRNOTAVAIL;
760
761 /* If the addresses are the same, this is a no-op */
762 if (ether_addr_equal(dev->dev_addr, addr->sa_data))
763 return 0;
764
765 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
766 macvlan_set_addr_change(vlan->port);
767 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
768 }
769
770 if (macvlan_addr_busy(vlan->port, addr->sa_data))
771 return -EADDRINUSE;
772
773 return macvlan_sync_address(dev, addr->sa_data);
774}
775
776static void macvlan_change_rx_flags(struct net_device *dev, int change)
777{
778 struct macvlan_dev *vlan = netdev_priv(dev);
779 struct net_device *lowerdev = vlan->lowerdev;
780
781 if (dev->flags & IFF_UP) {
782 if (change & IFF_ALLMULTI)
783 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
784 if (!macvlan_passthru(vlan->port) && change & IFF_PROMISC)
785 dev_set_promiscuity(lowerdev,
786 dev->flags & IFF_PROMISC ? 1 : -1);
787
788 }
789}
790
791static void macvlan_compute_filter(unsigned long *mc_filter,
792 struct net_device *dev,
793 struct macvlan_dev *vlan, int cutoff)
794{
795 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
796 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
797 } else {
798 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
799 struct netdev_hw_addr *ha;
800
801 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
802 netdev_for_each_mc_addr(ha, dev) {
803 if (!vlan && ha->synced <= cutoff)
804 continue;
805
806 __set_bit(mc_hash(vlan, ha->addr), filter);
807 }
808
809 __set_bit(mc_hash(vlan, dev->broadcast), filter);
810
811 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
812 }
813}
814
815static void macvlan_recompute_bc_filter(struct macvlan_dev *vlan)
816{
817 if (vlan->port->bc_cutoff < 0) {
818 bitmap_zero(vlan->port->bc_filter, MACVLAN_MC_FILTER_SZ);
819 return;
820 }
821
822 macvlan_compute_filter(vlan->port->bc_filter, vlan->lowerdev, NULL,
823 vlan->port->bc_cutoff);
824}
825
826static void macvlan_set_mac_lists(struct net_device *dev)
827{
828 struct macvlan_dev *vlan = netdev_priv(dev);
829
830 macvlan_compute_filter(vlan->mc_filter, dev, vlan, 0);
831
832 dev_uc_sync(vlan->lowerdev, dev);
833 dev_mc_sync(vlan->lowerdev, dev);
834
835 /* This is slightly inaccurate as we're including the subscription
836 * list of vlan->lowerdev too.
837 *
838 * Bug alert: This only works if everyone has the same broadcast
839 * address as lowerdev. As soon as someone changes theirs this
840 * will break.
841 *
842 * However, this is already broken as when you change your broadcast
843 * address we don't get called.
844 *
845 * The solution is to maintain a list of broadcast addresses like
846 * we do for uc/mc, if you care.
847 */
848 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL,
849 0);
850 macvlan_recompute_bc_filter(vlan);
851}
852
853static void update_port_bc_cutoff(struct macvlan_dev *vlan, int cutoff)
854{
855 if (vlan->port->bc_cutoff == cutoff)
856 return;
857
858 vlan->port->bc_cutoff = cutoff;
859 macvlan_recompute_bc_filter(vlan);
860}
861
862static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
863{
864 struct macvlan_dev *vlan = netdev_priv(dev);
865
866 if (vlan->lowerdev->mtu < new_mtu)
867 return -EINVAL;
868 dev->mtu = new_mtu;
869 return 0;
870}
871
872static int macvlan_hwtstamp_get(struct net_device *dev,
873 struct kernel_hwtstamp_config *cfg)
874{
875 struct net_device *real_dev = macvlan_dev_real_dev(dev);
876
877 return generic_hwtstamp_get_lower(real_dev, cfg);
878}
879
880static int macvlan_hwtstamp_set(struct net_device *dev,
881 struct kernel_hwtstamp_config *cfg,
882 struct netlink_ext_ack *extack)
883{
884 struct net_device *real_dev = macvlan_dev_real_dev(dev);
885
886 if (!net_eq(dev_net(dev), &init_net))
887 return -EOPNOTSUPP;
888
889 return generic_hwtstamp_set_lower(real_dev, cfg, extack);
890}
891
892/*
893 * macvlan network devices have devices nesting below it and are a special
894 * "super class" of normal network devices; split their locks off into a
895 * separate class since they always nest.
896 */
897static struct lock_class_key macvlan_netdev_addr_lock_key;
898
899#define ALWAYS_ON_OFFLOADS \
900 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
901 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
902
903#define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
904
905#define MACVLAN_FEATURES \
906 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
907 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
908 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
909 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
910
911#define MACVLAN_STATE_MASK \
912 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
913
914static void macvlan_set_lockdep_class(struct net_device *dev)
915{
916 netdev_lockdep_set_classes(dev);
917 lockdep_set_class(&dev->addr_list_lock,
918 &macvlan_netdev_addr_lock_key);
919}
920
921static int macvlan_init(struct net_device *dev)
922{
923 struct macvlan_dev *vlan = netdev_priv(dev);
924 struct net_device *lowerdev = vlan->lowerdev;
925 struct macvlan_port *port = vlan->port;
926
927 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
928 (lowerdev->state & MACVLAN_STATE_MASK);
929 dev->features = lowerdev->features & MACVLAN_FEATURES;
930 dev->features |= ALWAYS_ON_FEATURES;
931 dev->hw_features |= NETIF_F_LRO;
932 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
933 dev->vlan_features |= ALWAYS_ON_OFFLOADS;
934 dev->hw_enc_features |= dev->features;
935 netif_inherit_tso_max(dev, lowerdev);
936 dev->hard_header_len = lowerdev->hard_header_len;
937 macvlan_set_lockdep_class(dev);
938
939 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
940 if (!vlan->pcpu_stats)
941 return -ENOMEM;
942
943 port->count += 1;
944
945 /* Get macvlan's reference to lowerdev */
946 netdev_hold(lowerdev, &vlan->dev_tracker, GFP_KERNEL);
947
948 return 0;
949}
950
951static void macvlan_uninit(struct net_device *dev)
952{
953 struct macvlan_dev *vlan = netdev_priv(dev);
954 struct macvlan_port *port = vlan->port;
955
956 free_percpu(vlan->pcpu_stats);
957
958 macvlan_flush_sources(port, vlan);
959 port->count -= 1;
960 if (!port->count)
961 macvlan_port_destroy(port->dev);
962}
963
964static void macvlan_dev_get_stats64(struct net_device *dev,
965 struct rtnl_link_stats64 *stats)
966{
967 struct macvlan_dev *vlan = netdev_priv(dev);
968
969 if (vlan->pcpu_stats) {
970 struct vlan_pcpu_stats *p;
971 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
972 u32 rx_errors = 0, tx_dropped = 0;
973 unsigned int start;
974 int i;
975
976 for_each_possible_cpu(i) {
977 p = per_cpu_ptr(vlan->pcpu_stats, i);
978 do {
979 start = u64_stats_fetch_begin(&p->syncp);
980 rx_packets = u64_stats_read(&p->rx_packets);
981 rx_bytes = u64_stats_read(&p->rx_bytes);
982 rx_multicast = u64_stats_read(&p->rx_multicast);
983 tx_packets = u64_stats_read(&p->tx_packets);
984 tx_bytes = u64_stats_read(&p->tx_bytes);
985 } while (u64_stats_fetch_retry(&p->syncp, start));
986
987 stats->rx_packets += rx_packets;
988 stats->rx_bytes += rx_bytes;
989 stats->multicast += rx_multicast;
990 stats->tx_packets += tx_packets;
991 stats->tx_bytes += tx_bytes;
992 /* rx_errors & tx_dropped are u32, updated
993 * without syncp protection.
994 */
995 rx_errors += READ_ONCE(p->rx_errors);
996 tx_dropped += READ_ONCE(p->tx_dropped);
997 }
998 stats->rx_errors = rx_errors;
999 stats->rx_dropped = rx_errors;
1000 stats->tx_dropped = tx_dropped;
1001 }
1002}
1003
1004static int macvlan_vlan_rx_add_vid(struct net_device *dev,
1005 __be16 proto, u16 vid)
1006{
1007 struct macvlan_dev *vlan = netdev_priv(dev);
1008 struct net_device *lowerdev = vlan->lowerdev;
1009
1010 return vlan_vid_add(lowerdev, proto, vid);
1011}
1012
1013static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
1014 __be16 proto, u16 vid)
1015{
1016 struct macvlan_dev *vlan = netdev_priv(dev);
1017 struct net_device *lowerdev = vlan->lowerdev;
1018
1019 vlan_vid_del(lowerdev, proto, vid);
1020 return 0;
1021}
1022
1023static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1024 struct net_device *dev,
1025 const unsigned char *addr, u16 vid,
1026 u16 flags,
1027 struct netlink_ext_ack *extack)
1028{
1029 struct macvlan_dev *vlan = netdev_priv(dev);
1030 int err = -EINVAL;
1031
1032 /* Support unicast filter only on passthru devices.
1033 * Multicast filter should be allowed on all devices.
1034 */
1035 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1036 return -EOPNOTSUPP;
1037
1038 if (flags & NLM_F_REPLACE)
1039 return -EOPNOTSUPP;
1040
1041 if (is_unicast_ether_addr(addr))
1042 err = dev_uc_add_excl(dev, addr);
1043 else if (is_multicast_ether_addr(addr))
1044 err = dev_mc_add_excl(dev, addr);
1045
1046 return err;
1047}
1048
1049static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1050 struct net_device *dev,
1051 const unsigned char *addr, u16 vid,
1052 struct netlink_ext_ack *extack)
1053{
1054 struct macvlan_dev *vlan = netdev_priv(dev);
1055 int err = -EINVAL;
1056
1057 /* Support unicast filter only on passthru devices.
1058 * Multicast filter should be allowed on all devices.
1059 */
1060 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1061 return -EOPNOTSUPP;
1062
1063 if (is_unicast_ether_addr(addr))
1064 err = dev_uc_del(dev, addr);
1065 else if (is_multicast_ether_addr(addr))
1066 err = dev_mc_del(dev, addr);
1067
1068 return err;
1069}
1070
1071static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1072 struct ethtool_drvinfo *drvinfo)
1073{
1074 strscpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1075 strscpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1076}
1077
1078static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1079 struct ethtool_link_ksettings *cmd)
1080{
1081 const struct macvlan_dev *vlan = netdev_priv(dev);
1082
1083 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1084}
1085
1086static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1087 struct ethtool_ts_info *info)
1088{
1089 struct net_device *real_dev = macvlan_dev_real_dev(dev);
1090
1091 return ethtool_get_ts_info_by_layer(real_dev, info);
1092}
1093
1094static netdev_features_t macvlan_fix_features(struct net_device *dev,
1095 netdev_features_t features)
1096{
1097 struct macvlan_dev *vlan = netdev_priv(dev);
1098 netdev_features_t lowerdev_features = vlan->lowerdev->features;
1099 netdev_features_t mask;
1100
1101 features |= NETIF_F_ALL_FOR_ALL;
1102 features &= (vlan->set_features | ~MACVLAN_FEATURES);
1103 mask = features;
1104
1105 lowerdev_features &= (features | ~NETIF_F_LRO);
1106 features = netdev_increment_features(lowerdev_features, features, mask);
1107 features |= ALWAYS_ON_FEATURES;
1108 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1109
1110 return features;
1111}
1112
1113#ifdef CONFIG_NET_POLL_CONTROLLER
1114static void macvlan_dev_poll_controller(struct net_device *dev)
1115{
1116 return;
1117}
1118
1119static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1120{
1121 struct macvlan_dev *vlan = netdev_priv(dev);
1122 struct net_device *real_dev = vlan->lowerdev;
1123 struct netpoll *netpoll;
1124 int err;
1125
1126 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1127 err = -ENOMEM;
1128 if (!netpoll)
1129 goto out;
1130
1131 err = __netpoll_setup(netpoll, real_dev);
1132 if (err) {
1133 kfree(netpoll);
1134 goto out;
1135 }
1136
1137 vlan->netpoll = netpoll;
1138
1139out:
1140 return err;
1141}
1142
1143static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1144{
1145 struct macvlan_dev *vlan = netdev_priv(dev);
1146 struct netpoll *netpoll = vlan->netpoll;
1147
1148 if (!netpoll)
1149 return;
1150
1151 vlan->netpoll = NULL;
1152
1153 __netpoll_free(netpoll);
1154}
1155#endif /* CONFIG_NET_POLL_CONTROLLER */
1156
1157static int macvlan_dev_get_iflink(const struct net_device *dev)
1158{
1159 struct macvlan_dev *vlan = netdev_priv(dev);
1160
1161 return vlan->lowerdev->ifindex;
1162}
1163
1164static const struct ethtool_ops macvlan_ethtool_ops = {
1165 .get_link = ethtool_op_get_link,
1166 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1167 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1168 .get_ts_info = macvlan_ethtool_get_ts_info,
1169};
1170
1171static const struct net_device_ops macvlan_netdev_ops = {
1172 .ndo_init = macvlan_init,
1173 .ndo_uninit = macvlan_uninit,
1174 .ndo_open = macvlan_open,
1175 .ndo_stop = macvlan_stop,
1176 .ndo_start_xmit = macvlan_start_xmit,
1177 .ndo_change_mtu = macvlan_change_mtu,
1178 .ndo_fix_features = macvlan_fix_features,
1179 .ndo_change_rx_flags = macvlan_change_rx_flags,
1180 .ndo_set_mac_address = macvlan_set_mac_address,
1181 .ndo_set_rx_mode = macvlan_set_mac_lists,
1182 .ndo_get_stats64 = macvlan_dev_get_stats64,
1183 .ndo_validate_addr = eth_validate_addr,
1184 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1185 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1186 .ndo_fdb_add = macvlan_fdb_add,
1187 .ndo_fdb_del = macvlan_fdb_del,
1188 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1189#ifdef CONFIG_NET_POLL_CONTROLLER
1190 .ndo_poll_controller = macvlan_dev_poll_controller,
1191 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1192 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1193#endif
1194 .ndo_get_iflink = macvlan_dev_get_iflink,
1195 .ndo_features_check = passthru_features_check,
1196 .ndo_hwtstamp_get = macvlan_hwtstamp_get,
1197 .ndo_hwtstamp_set = macvlan_hwtstamp_set,
1198};
1199
1200static void macvlan_dev_free(struct net_device *dev)
1201{
1202 struct macvlan_dev *vlan = netdev_priv(dev);
1203
1204 /* Get rid of the macvlan's reference to lowerdev */
1205 netdev_put(vlan->lowerdev, &vlan->dev_tracker);
1206}
1207
1208void macvlan_common_setup(struct net_device *dev)
1209{
1210 ether_setup(dev);
1211
1212 /* ether_setup() has set dev->min_mtu to ETH_MIN_MTU. */
1213 dev->max_mtu = ETH_MAX_MTU;
1214 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1215 netif_keep_dst(dev);
1216 dev->priv_flags |= IFF_UNICAST_FLT | IFF_CHANGE_PROTO_DOWN;
1217 dev->netdev_ops = &macvlan_netdev_ops;
1218 dev->needs_free_netdev = true;
1219 dev->priv_destructor = macvlan_dev_free;
1220 dev->header_ops = &macvlan_hard_header_ops;
1221 dev->ethtool_ops = &macvlan_ethtool_ops;
1222}
1223EXPORT_SYMBOL_GPL(macvlan_common_setup);
1224
1225static void macvlan_setup(struct net_device *dev)
1226{
1227 macvlan_common_setup(dev);
1228 dev->priv_flags |= IFF_NO_QUEUE;
1229}
1230
1231static int macvlan_port_create(struct net_device *dev)
1232{
1233 struct macvlan_port *port;
1234 unsigned int i;
1235 int err;
1236
1237 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1238 return -EINVAL;
1239
1240 if (netdev_is_rx_handler_busy(dev))
1241 return -EBUSY;
1242
1243 port = kzalloc(sizeof(*port), GFP_KERNEL);
1244 if (port == NULL)
1245 return -ENOMEM;
1246
1247 port->dev = dev;
1248 ether_addr_copy(port->perm_addr, dev->dev_addr);
1249 INIT_LIST_HEAD(&port->vlans);
1250 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1251 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1252 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1253 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1254
1255 port->bc_queue_len_used = 0;
1256 port->bc_cutoff = 1;
1257 skb_queue_head_init(&port->bc_queue);
1258 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1259
1260 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1261 if (err)
1262 kfree(port);
1263 else
1264 dev->priv_flags |= IFF_MACVLAN_PORT;
1265 return err;
1266}
1267
1268static void macvlan_port_destroy(struct net_device *dev)
1269{
1270 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1271 struct sk_buff *skb;
1272
1273 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1274 netdev_rx_handler_unregister(dev);
1275
1276 /* After this point, no packet can schedule bc_work anymore,
1277 * but we need to cancel it and purge left skbs if any.
1278 */
1279 cancel_work_sync(&port->bc_work);
1280
1281 while ((skb = __skb_dequeue(&port->bc_queue))) {
1282 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1283
1284 if (src)
1285 dev_put(src->dev);
1286
1287 kfree_skb(skb);
1288 }
1289
1290 /* If the lower device address has been changed by passthru
1291 * macvlan, put it back.
1292 */
1293 if (macvlan_passthru(port) &&
1294 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1295 struct sockaddr sa;
1296
1297 sa.sa_family = port->dev->type;
1298 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1299 dev_set_mac_address(port->dev, &sa, NULL);
1300 }
1301
1302 kfree(port);
1303}
1304
1305static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1306 struct netlink_ext_ack *extack)
1307{
1308 struct nlattr *nla, *head;
1309 int rem, len;
1310
1311 if (tb[IFLA_ADDRESS]) {
1312 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1313 return -EINVAL;
1314 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1315 return -EADDRNOTAVAIL;
1316 }
1317
1318 if (!data)
1319 return 0;
1320
1321 if (data[IFLA_MACVLAN_FLAGS] &&
1322 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC |
1323 MACVLAN_FLAG_NODST))
1324 return -EINVAL;
1325
1326 if (data[IFLA_MACVLAN_MODE]) {
1327 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1328 case MACVLAN_MODE_PRIVATE:
1329 case MACVLAN_MODE_VEPA:
1330 case MACVLAN_MODE_BRIDGE:
1331 case MACVLAN_MODE_PASSTHRU:
1332 case MACVLAN_MODE_SOURCE:
1333 break;
1334 default:
1335 return -EINVAL;
1336 }
1337 }
1338
1339 if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1340 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1341 case MACVLAN_MACADDR_ADD:
1342 case MACVLAN_MACADDR_DEL:
1343 case MACVLAN_MACADDR_FLUSH:
1344 case MACVLAN_MACADDR_SET:
1345 break;
1346 default:
1347 return -EINVAL;
1348 }
1349 }
1350
1351 if (data[IFLA_MACVLAN_MACADDR]) {
1352 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1353 return -EINVAL;
1354
1355 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1356 return -EADDRNOTAVAIL;
1357 }
1358
1359 if (data[IFLA_MACVLAN_MACADDR_DATA]) {
1360 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1361 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1362
1363 nla_for_each_attr(nla, head, len, rem) {
1364 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1365 nla_len(nla) != ETH_ALEN)
1366 return -EINVAL;
1367
1368 if (!is_valid_ether_addr(nla_data(nla)))
1369 return -EADDRNOTAVAIL;
1370 }
1371 }
1372
1373 if (data[IFLA_MACVLAN_MACADDR_COUNT])
1374 return -EINVAL;
1375
1376 return 0;
1377}
1378
1379/*
1380 * reconfigure list of remote source mac address
1381 * (only for macvlan devices in source mode)
1382 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1383 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1384 */
1385static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1386 struct nlattr *data[])
1387{
1388 char *addr = NULL;
1389 int ret, rem, len;
1390 struct nlattr *nla, *head;
1391 struct macvlan_source_entry *entry;
1392
1393 if (data[IFLA_MACVLAN_MACADDR])
1394 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1395
1396 if (mode == MACVLAN_MACADDR_ADD) {
1397 if (!addr)
1398 return -EINVAL;
1399
1400 return macvlan_hash_add_source(vlan, addr);
1401
1402 } else if (mode == MACVLAN_MACADDR_DEL) {
1403 if (!addr)
1404 return -EINVAL;
1405
1406 entry = macvlan_hash_lookup_source(vlan, addr);
1407 if (entry) {
1408 macvlan_hash_del_source(entry);
1409 vlan->macaddr_count--;
1410 }
1411 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1412 macvlan_flush_sources(vlan->port, vlan);
1413 } else if (mode == MACVLAN_MACADDR_SET) {
1414 macvlan_flush_sources(vlan->port, vlan);
1415
1416 if (addr) {
1417 ret = macvlan_hash_add_source(vlan, addr);
1418 if (ret)
1419 return ret;
1420 }
1421
1422 if (!data[IFLA_MACVLAN_MACADDR_DATA])
1423 return 0;
1424
1425 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1426 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1427
1428 nla_for_each_attr(nla, head, len, rem) {
1429 addr = nla_data(nla);
1430 ret = macvlan_hash_add_source(vlan, addr);
1431 if (ret)
1432 return ret;
1433 }
1434 } else {
1435 return -EINVAL;
1436 }
1437
1438 return 0;
1439}
1440
1441int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1442 struct nlattr *tb[], struct nlattr *data[],
1443 struct netlink_ext_ack *extack)
1444{
1445 struct macvlan_dev *vlan = netdev_priv(dev);
1446 struct macvlan_port *port;
1447 struct net_device *lowerdev;
1448 int err;
1449 int macmode;
1450 bool create = false;
1451
1452 if (!tb[IFLA_LINK])
1453 return -EINVAL;
1454
1455 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1456 if (lowerdev == NULL)
1457 return -ENODEV;
1458
1459 /* When creating macvlans or macvtaps on top of other macvlans - use
1460 * the real device as the lowerdev.
1461 */
1462 if (netif_is_macvlan(lowerdev))
1463 lowerdev = macvlan_dev_real_dev(lowerdev);
1464
1465 if (!tb[IFLA_MTU])
1466 dev->mtu = lowerdev->mtu;
1467 else if (dev->mtu > lowerdev->mtu)
1468 return -EINVAL;
1469
1470 /* MTU range: 68 - lowerdev->max_mtu */
1471 dev->min_mtu = ETH_MIN_MTU;
1472 dev->max_mtu = lowerdev->max_mtu;
1473
1474 if (!tb[IFLA_ADDRESS])
1475 eth_hw_addr_random(dev);
1476
1477 if (!netif_is_macvlan_port(lowerdev)) {
1478 err = macvlan_port_create(lowerdev);
1479 if (err < 0)
1480 return err;
1481 create = true;
1482 }
1483 port = macvlan_port_get_rtnl(lowerdev);
1484
1485 /* Only 1 macvlan device can be created in passthru mode */
1486 if (macvlan_passthru(port)) {
1487 /* The macvlan port must be not created this time,
1488 * still goto destroy_macvlan_port for readability.
1489 */
1490 err = -EINVAL;
1491 goto destroy_macvlan_port;
1492 }
1493
1494 vlan->lowerdev = lowerdev;
1495 vlan->dev = dev;
1496 vlan->port = port;
1497 vlan->set_features = MACVLAN_FEATURES;
1498
1499 vlan->mode = MACVLAN_MODE_VEPA;
1500 if (data && data[IFLA_MACVLAN_MODE])
1501 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1502
1503 if (data && data[IFLA_MACVLAN_FLAGS])
1504 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1505
1506 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1507 if (port->count) {
1508 err = -EINVAL;
1509 goto destroy_macvlan_port;
1510 }
1511 macvlan_set_passthru(port);
1512 eth_hw_addr_inherit(dev, lowerdev);
1513 }
1514
1515 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1516 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1517 err = -EINVAL;
1518 goto destroy_macvlan_port;
1519 }
1520 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1521 err = macvlan_changelink_sources(vlan, macmode, data);
1522 if (err)
1523 goto destroy_macvlan_port;
1524 }
1525
1526 vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN;
1527 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN])
1528 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1529
1530 if (data && data[IFLA_MACVLAN_BC_CUTOFF])
1531 update_port_bc_cutoff(
1532 vlan, nla_get_s32(data[IFLA_MACVLAN_BC_CUTOFF]));
1533
1534 err = register_netdevice(dev);
1535 if (err < 0)
1536 goto destroy_macvlan_port;
1537
1538 dev->priv_flags |= IFF_MACVLAN;
1539 err = netdev_upper_dev_link(lowerdev, dev, extack);
1540 if (err)
1541 goto unregister_netdev;
1542
1543 list_add_tail_rcu(&vlan->list, &port->vlans);
1544 update_port_bc_queue_len(vlan->port);
1545 netif_stacked_transfer_operstate(lowerdev, dev);
1546 linkwatch_fire_event(dev);
1547
1548 return 0;
1549
1550unregister_netdev:
1551 /* macvlan_uninit would free the macvlan port */
1552 unregister_netdevice(dev);
1553 return err;
1554destroy_macvlan_port:
1555 /* the macvlan port may be freed by macvlan_uninit when fail to register.
1556 * so we destroy the macvlan port only when it's valid.
1557 */
1558 if (create && macvlan_port_get_rtnl(lowerdev)) {
1559 macvlan_flush_sources(port, vlan);
1560 macvlan_port_destroy(port->dev);
1561 }
1562 return err;
1563}
1564EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1565
1566static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1567 struct nlattr *tb[], struct nlattr *data[],
1568 struct netlink_ext_ack *extack)
1569{
1570 return macvlan_common_newlink(src_net, dev, tb, data, extack);
1571}
1572
1573void macvlan_dellink(struct net_device *dev, struct list_head *head)
1574{
1575 struct macvlan_dev *vlan = netdev_priv(dev);
1576
1577 if (vlan->mode == MACVLAN_MODE_SOURCE)
1578 macvlan_flush_sources(vlan->port, vlan);
1579 list_del_rcu(&vlan->list);
1580 update_port_bc_queue_len(vlan->port);
1581 unregister_netdevice_queue(dev, head);
1582 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1583}
1584EXPORT_SYMBOL_GPL(macvlan_dellink);
1585
1586static int macvlan_changelink(struct net_device *dev,
1587 struct nlattr *tb[], struct nlattr *data[],
1588 struct netlink_ext_ack *extack)
1589{
1590 struct macvlan_dev *vlan = netdev_priv(dev);
1591 enum macvlan_mode mode;
1592 bool set_mode = false;
1593 enum macvlan_macaddr_mode macmode;
1594 int ret;
1595
1596 /* Validate mode, but don't set yet: setting flags may fail. */
1597 if (data && data[IFLA_MACVLAN_MODE]) {
1598 set_mode = true;
1599 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1600 /* Passthrough mode can't be set or cleared dynamically */
1601 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1602 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1603 return -EINVAL;
1604 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1605 vlan->mode != mode)
1606 macvlan_flush_sources(vlan->port, vlan);
1607 }
1608
1609 if (data && data[IFLA_MACVLAN_FLAGS]) {
1610 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1611 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1612 if (macvlan_passthru(vlan->port) && promisc) {
1613 int err;
1614
1615 if (flags & MACVLAN_FLAG_NOPROMISC)
1616 err = dev_set_promiscuity(vlan->lowerdev, -1);
1617 else
1618 err = dev_set_promiscuity(vlan->lowerdev, 1);
1619 if (err < 0)
1620 return err;
1621 }
1622 vlan->flags = flags;
1623 }
1624
1625 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) {
1626 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1627 update_port_bc_queue_len(vlan->port);
1628 }
1629
1630 if (data && data[IFLA_MACVLAN_BC_CUTOFF])
1631 update_port_bc_cutoff(
1632 vlan, nla_get_s32(data[IFLA_MACVLAN_BC_CUTOFF]));
1633
1634 if (set_mode)
1635 vlan->mode = mode;
1636 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1637 if (vlan->mode != MACVLAN_MODE_SOURCE)
1638 return -EINVAL;
1639 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1640 ret = macvlan_changelink_sources(vlan, macmode, data);
1641 if (ret)
1642 return ret;
1643 }
1644 return 0;
1645}
1646
1647static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1648{
1649 if (vlan->macaddr_count == 0)
1650 return 0;
1651 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1652 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1653}
1654
1655static size_t macvlan_get_size(const struct net_device *dev)
1656{
1657 struct macvlan_dev *vlan = netdev_priv(dev);
1658
1659 return (0
1660 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1661 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1662 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1663 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1664 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */
1665 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */
1666 );
1667}
1668
1669static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1670 const struct macvlan_dev *vlan,
1671 const int i)
1672{
1673 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1674 struct macvlan_source_entry *entry;
1675
1676 hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) {
1677 if (entry->vlan != vlan)
1678 continue;
1679 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1680 return 1;
1681 }
1682 return 0;
1683}
1684
1685static int macvlan_fill_info(struct sk_buff *skb,
1686 const struct net_device *dev)
1687{
1688 struct macvlan_dev *vlan = netdev_priv(dev);
1689 struct macvlan_port *port = vlan->port;
1690 int i;
1691 struct nlattr *nest;
1692
1693 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1694 goto nla_put_failure;
1695 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1696 goto nla_put_failure;
1697 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1698 goto nla_put_failure;
1699 if (vlan->macaddr_count > 0) {
1700 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1701 if (nest == NULL)
1702 goto nla_put_failure;
1703
1704 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1705 if (macvlan_fill_info_macaddr(skb, vlan, i))
1706 goto nla_put_failure;
1707 }
1708 nla_nest_end(skb, nest);
1709 }
1710 if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, vlan->bc_queue_len_req))
1711 goto nla_put_failure;
1712 if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, port->bc_queue_len_used))
1713 goto nla_put_failure;
1714 if (port->bc_cutoff != 1 &&
1715 nla_put_s32(skb, IFLA_MACVLAN_BC_CUTOFF, port->bc_cutoff))
1716 goto nla_put_failure;
1717 return 0;
1718
1719nla_put_failure:
1720 return -EMSGSIZE;
1721}
1722
1723static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1724 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1725 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1726 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1727 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1728 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1729 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1730 [IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 },
1731 [IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT },
1732 [IFLA_MACVLAN_BC_CUTOFF] = { .type = NLA_S32 },
1733};
1734
1735int macvlan_link_register(struct rtnl_link_ops *ops)
1736{
1737 /* common fields */
1738 ops->validate = macvlan_validate;
1739 ops->maxtype = IFLA_MACVLAN_MAX;
1740 ops->policy = macvlan_policy;
1741 ops->changelink = macvlan_changelink;
1742 ops->get_size = macvlan_get_size;
1743 ops->fill_info = macvlan_fill_info;
1744
1745 return rtnl_link_register(ops);
1746};
1747EXPORT_SYMBOL_GPL(macvlan_link_register);
1748
1749static struct net *macvlan_get_link_net(const struct net_device *dev)
1750{
1751 return dev_net(macvlan_dev_real_dev(dev));
1752}
1753
1754static struct rtnl_link_ops macvlan_link_ops = {
1755 .kind = "macvlan",
1756 .setup = macvlan_setup,
1757 .newlink = macvlan_newlink,
1758 .dellink = macvlan_dellink,
1759 .get_link_net = macvlan_get_link_net,
1760 .priv_size = sizeof(struct macvlan_dev),
1761};
1762
1763static void update_port_bc_queue_len(struct macvlan_port *port)
1764{
1765 u32 max_bc_queue_len_req = 0;
1766 struct macvlan_dev *vlan;
1767
1768 list_for_each_entry(vlan, &port->vlans, list) {
1769 if (vlan->bc_queue_len_req > max_bc_queue_len_req)
1770 max_bc_queue_len_req = vlan->bc_queue_len_req;
1771 }
1772 port->bc_queue_len_used = max_bc_queue_len_req;
1773}
1774
1775static int macvlan_device_event(struct notifier_block *unused,
1776 unsigned long event, void *ptr)
1777{
1778 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1779 struct macvlan_dev *vlan, *next;
1780 struct macvlan_port *port;
1781 LIST_HEAD(list_kill);
1782
1783 if (!netif_is_macvlan_port(dev))
1784 return NOTIFY_DONE;
1785
1786 port = macvlan_port_get_rtnl(dev);
1787
1788 switch (event) {
1789 case NETDEV_UP:
1790 case NETDEV_DOWN:
1791 case NETDEV_CHANGE:
1792 list_for_each_entry(vlan, &port->vlans, list)
1793 netif_stacked_transfer_operstate(vlan->lowerdev,
1794 vlan->dev);
1795 break;
1796 case NETDEV_FEAT_CHANGE:
1797 list_for_each_entry(vlan, &port->vlans, list) {
1798 netif_inherit_tso_max(vlan->dev, dev);
1799 netdev_update_features(vlan->dev);
1800 }
1801 break;
1802 case NETDEV_CHANGEMTU:
1803 list_for_each_entry(vlan, &port->vlans, list) {
1804 if (vlan->dev->mtu <= dev->mtu)
1805 continue;
1806 dev_set_mtu(vlan->dev, dev->mtu);
1807 }
1808 break;
1809 case NETDEV_CHANGEADDR:
1810 if (!macvlan_passthru(port))
1811 return NOTIFY_DONE;
1812
1813 vlan = list_first_entry_or_null(&port->vlans,
1814 struct macvlan_dev,
1815 list);
1816
1817 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
1818 return NOTIFY_BAD;
1819
1820 break;
1821 case NETDEV_UNREGISTER:
1822 /* twiddle thumbs on netns device moves */
1823 if (dev->reg_state != NETREG_UNREGISTERING)
1824 break;
1825
1826 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1827 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1828 unregister_netdevice_many(&list_kill);
1829 break;
1830 case NETDEV_PRE_TYPE_CHANGE:
1831 /* Forbid underlying device to change its type. */
1832 return NOTIFY_BAD;
1833
1834 case NETDEV_NOTIFY_PEERS:
1835 case NETDEV_BONDING_FAILOVER:
1836 case NETDEV_RESEND_IGMP:
1837 /* Propagate to all vlans */
1838 list_for_each_entry(vlan, &port->vlans, list)
1839 call_netdevice_notifiers(event, vlan->dev);
1840 }
1841 return NOTIFY_DONE;
1842}
1843
1844static struct notifier_block macvlan_notifier_block __read_mostly = {
1845 .notifier_call = macvlan_device_event,
1846};
1847
1848static int __init macvlan_init_module(void)
1849{
1850 int err;
1851
1852 register_netdevice_notifier(&macvlan_notifier_block);
1853
1854 err = macvlan_link_register(&macvlan_link_ops);
1855 if (err < 0)
1856 goto err1;
1857 return 0;
1858err1:
1859 unregister_netdevice_notifier(&macvlan_notifier_block);
1860 return err;
1861}
1862
1863static void __exit macvlan_cleanup_module(void)
1864{
1865 rtnl_link_unregister(&macvlan_link_ops);
1866 unregister_netdevice_notifier(&macvlan_notifier_block);
1867}
1868
1869module_init(macvlan_init_module);
1870module_exit(macvlan_cleanup_module);
1871
1872MODULE_LICENSE("GPL");
1873MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1874MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1875MODULE_ALIAS_RTNL_LINK("macvlan");
1/*
2 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of
7 * the License, or (at your option) any later version.
8 *
9 * The code this is based on carried the following copyright notice:
10 * ---
11 * (C) Copyright 2001-2006
12 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
13 * Re-worked by Ben Greear <greearb@candelatech.com>
14 * ---
15 */
16#include <linux/kernel.h>
17#include <linux/types.h>
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/errno.h>
21#include <linux/slab.h>
22#include <linux/string.h>
23#include <linux/rculist.h>
24#include <linux/notifier.h>
25#include <linux/netdevice.h>
26#include <linux/etherdevice.h>
27#include <linux/ethtool.h>
28#include <linux/if_arp.h>
29#include <linux/if_link.h>
30#include <linux/if_macvlan.h>
31#include <net/rtnetlink.h>
32#include <net/xfrm.h>
33
34#define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
35
36struct macvlan_port {
37 struct net_device *dev;
38 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
39 struct list_head vlans;
40 struct rcu_head rcu;
41 bool passthru;
42 int count;
43};
44
45static void macvlan_port_destroy(struct net_device *dev);
46
47#define macvlan_port_get_rcu(dev) \
48 ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
49#define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
50#define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
51
52static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
53 const unsigned char *addr)
54{
55 struct macvlan_dev *vlan;
56 struct hlist_node *n;
57
58 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
59 if (!compare_ether_addr_64bits(vlan->dev->dev_addr, addr))
60 return vlan;
61 }
62 return NULL;
63}
64
65static void macvlan_hash_add(struct macvlan_dev *vlan)
66{
67 struct macvlan_port *port = vlan->port;
68 const unsigned char *addr = vlan->dev->dev_addr;
69
70 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
71}
72
73static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
74{
75 hlist_del_rcu(&vlan->hlist);
76 if (sync)
77 synchronize_rcu();
78}
79
80static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
81 const unsigned char *addr)
82{
83 macvlan_hash_del(vlan, true);
84 /* Now that we are unhashed it is safe to change the device
85 * address without confusing packet delivery.
86 */
87 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
88 macvlan_hash_add(vlan);
89}
90
91static int macvlan_addr_busy(const struct macvlan_port *port,
92 const unsigned char *addr)
93{
94 /* Test to see if the specified multicast address is
95 * currently in use by the underlying device or
96 * another macvlan.
97 */
98 if (!compare_ether_addr_64bits(port->dev->dev_addr, addr))
99 return 1;
100
101 if (macvlan_hash_lookup(port, addr))
102 return 1;
103
104 return 0;
105}
106
107
108static int macvlan_broadcast_one(struct sk_buff *skb,
109 const struct macvlan_dev *vlan,
110 const struct ethhdr *eth, bool local)
111{
112 struct net_device *dev = vlan->dev;
113 if (!skb)
114 return NET_RX_DROP;
115
116 if (local)
117 return vlan->forward(dev, skb);
118
119 skb->dev = dev;
120 if (!compare_ether_addr_64bits(eth->h_dest,
121 dev->broadcast))
122 skb->pkt_type = PACKET_BROADCAST;
123 else
124 skb->pkt_type = PACKET_MULTICAST;
125
126 return vlan->receive(skb);
127}
128
129static void macvlan_broadcast(struct sk_buff *skb,
130 const struct macvlan_port *port,
131 struct net_device *src,
132 enum macvlan_mode mode)
133{
134 const struct ethhdr *eth = eth_hdr(skb);
135 const struct macvlan_dev *vlan;
136 struct hlist_node *n;
137 struct sk_buff *nskb;
138 unsigned int i;
139 int err;
140
141 if (skb->protocol == htons(ETH_P_PAUSE))
142 return;
143
144 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
145 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
146 if (vlan->dev == src || !(vlan->mode & mode))
147 continue;
148
149 nskb = skb_clone(skb, GFP_ATOMIC);
150 err = macvlan_broadcast_one(nskb, vlan, eth,
151 mode == MACVLAN_MODE_BRIDGE);
152 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
153 err == NET_RX_SUCCESS, 1);
154 }
155 }
156}
157
158/* called under rcu_read_lock() from netif_receive_skb */
159static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
160{
161 struct macvlan_port *port;
162 struct sk_buff *skb = *pskb;
163 const struct ethhdr *eth = eth_hdr(skb);
164 const struct macvlan_dev *vlan;
165 const struct macvlan_dev *src;
166 struct net_device *dev;
167 unsigned int len = 0;
168 int ret = NET_RX_DROP;
169
170 port = macvlan_port_get_rcu(skb->dev);
171 if (is_multicast_ether_addr(eth->h_dest)) {
172 src = macvlan_hash_lookup(port, eth->h_source);
173 if (!src)
174 /* frame comes from an external address */
175 macvlan_broadcast(skb, port, NULL,
176 MACVLAN_MODE_PRIVATE |
177 MACVLAN_MODE_VEPA |
178 MACVLAN_MODE_PASSTHRU|
179 MACVLAN_MODE_BRIDGE);
180 else if (src->mode == MACVLAN_MODE_VEPA)
181 /* flood to everyone except source */
182 macvlan_broadcast(skb, port, src->dev,
183 MACVLAN_MODE_VEPA |
184 MACVLAN_MODE_BRIDGE);
185 else if (src->mode == MACVLAN_MODE_BRIDGE)
186 /*
187 * flood only to VEPA ports, bridge ports
188 * already saw the frame on the way out.
189 */
190 macvlan_broadcast(skb, port, src->dev,
191 MACVLAN_MODE_VEPA);
192 return RX_HANDLER_PASS;
193 }
194
195 if (port->passthru)
196 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
197 else
198 vlan = macvlan_hash_lookup(port, eth->h_dest);
199 if (vlan == NULL)
200 return RX_HANDLER_PASS;
201
202 dev = vlan->dev;
203 if (unlikely(!(dev->flags & IFF_UP))) {
204 kfree_skb(skb);
205 return RX_HANDLER_CONSUMED;
206 }
207 len = skb->len + ETH_HLEN;
208 skb = skb_share_check(skb, GFP_ATOMIC);
209 if (!skb)
210 goto out;
211
212 skb->dev = dev;
213 skb->pkt_type = PACKET_HOST;
214
215 ret = vlan->receive(skb);
216
217out:
218 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
219 return RX_HANDLER_CONSUMED;
220}
221
222static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
223{
224 const struct macvlan_dev *vlan = netdev_priv(dev);
225 const struct macvlan_port *port = vlan->port;
226 const struct macvlan_dev *dest;
227 __u8 ip_summed = skb->ip_summed;
228
229 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
230 const struct ethhdr *eth = (void *)skb->data;
231 skb->ip_summed = CHECKSUM_UNNECESSARY;
232
233 /* send to other bridge ports directly */
234 if (is_multicast_ether_addr(eth->h_dest)) {
235 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
236 goto xmit_world;
237 }
238
239 dest = macvlan_hash_lookup(port, eth->h_dest);
240 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
241 /* send to lowerdev first for its network taps */
242 dev_forward_skb(vlan->lowerdev, skb);
243
244 return NET_XMIT_SUCCESS;
245 }
246 }
247
248xmit_world:
249 skb->ip_summed = ip_summed;
250 skb_set_dev(skb, vlan->lowerdev);
251 return dev_queue_xmit(skb);
252}
253
254netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
255 struct net_device *dev)
256{
257 unsigned int len = skb->len;
258 int ret;
259 const struct macvlan_dev *vlan = netdev_priv(dev);
260
261 ret = macvlan_queue_xmit(skb, dev);
262 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
263 struct macvlan_pcpu_stats *pcpu_stats;
264
265 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
266 u64_stats_update_begin(&pcpu_stats->syncp);
267 pcpu_stats->tx_packets++;
268 pcpu_stats->tx_bytes += len;
269 u64_stats_update_end(&pcpu_stats->syncp);
270 } else {
271 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
272 }
273 return ret;
274}
275EXPORT_SYMBOL_GPL(macvlan_start_xmit);
276
277static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
278 unsigned short type, const void *daddr,
279 const void *saddr, unsigned len)
280{
281 const struct macvlan_dev *vlan = netdev_priv(dev);
282 struct net_device *lowerdev = vlan->lowerdev;
283
284 return dev_hard_header(skb, lowerdev, type, daddr,
285 saddr ? : dev->dev_addr, len);
286}
287
288static const struct header_ops macvlan_hard_header_ops = {
289 .create = macvlan_hard_header,
290 .rebuild = eth_rebuild_header,
291 .parse = eth_header_parse,
292 .cache = eth_header_cache,
293 .cache_update = eth_header_cache_update,
294};
295
296static int macvlan_open(struct net_device *dev)
297{
298 struct macvlan_dev *vlan = netdev_priv(dev);
299 struct net_device *lowerdev = vlan->lowerdev;
300 int err;
301
302 if (vlan->port->passthru) {
303 dev_set_promiscuity(lowerdev, 1);
304 goto hash_add;
305 }
306
307 err = -EBUSY;
308 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
309 goto out;
310
311 err = dev_uc_add(lowerdev, dev->dev_addr);
312 if (err < 0)
313 goto out;
314 if (dev->flags & IFF_ALLMULTI) {
315 err = dev_set_allmulti(lowerdev, 1);
316 if (err < 0)
317 goto del_unicast;
318 }
319
320hash_add:
321 macvlan_hash_add(vlan);
322 return 0;
323
324del_unicast:
325 dev_uc_del(lowerdev, dev->dev_addr);
326out:
327 return err;
328}
329
330static int macvlan_stop(struct net_device *dev)
331{
332 struct macvlan_dev *vlan = netdev_priv(dev);
333 struct net_device *lowerdev = vlan->lowerdev;
334
335 if (vlan->port->passthru) {
336 dev_set_promiscuity(lowerdev, -1);
337 goto hash_del;
338 }
339
340 dev_mc_unsync(lowerdev, dev);
341 if (dev->flags & IFF_ALLMULTI)
342 dev_set_allmulti(lowerdev, -1);
343
344 dev_uc_del(lowerdev, dev->dev_addr);
345
346hash_del:
347 macvlan_hash_del(vlan, !dev->dismantle);
348 return 0;
349}
350
351static int macvlan_set_mac_address(struct net_device *dev, void *p)
352{
353 struct macvlan_dev *vlan = netdev_priv(dev);
354 struct net_device *lowerdev = vlan->lowerdev;
355 struct sockaddr *addr = p;
356 int err;
357
358 if (!is_valid_ether_addr(addr->sa_data))
359 return -EADDRNOTAVAIL;
360
361 if (!(dev->flags & IFF_UP)) {
362 /* Just copy in the new address */
363 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
364 } else {
365 /* Rehash and update the device filters */
366 if (macvlan_addr_busy(vlan->port, addr->sa_data))
367 return -EBUSY;
368
369 err = dev_uc_add(lowerdev, addr->sa_data);
370 if (err)
371 return err;
372
373 dev_uc_del(lowerdev, dev->dev_addr);
374
375 macvlan_hash_change_addr(vlan, addr->sa_data);
376 }
377 return 0;
378}
379
380static void macvlan_change_rx_flags(struct net_device *dev, int change)
381{
382 struct macvlan_dev *vlan = netdev_priv(dev);
383 struct net_device *lowerdev = vlan->lowerdev;
384
385 if (change & IFF_ALLMULTI)
386 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
387}
388
389static void macvlan_set_multicast_list(struct net_device *dev)
390{
391 struct macvlan_dev *vlan = netdev_priv(dev);
392
393 dev_mc_sync(vlan->lowerdev, dev);
394}
395
396static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
397{
398 struct macvlan_dev *vlan = netdev_priv(dev);
399
400 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
401 return -EINVAL;
402 dev->mtu = new_mtu;
403 return 0;
404}
405
406/*
407 * macvlan network devices have devices nesting below it and are a special
408 * "super class" of normal network devices; split their locks off into a
409 * separate class since they always nest.
410 */
411static struct lock_class_key macvlan_netdev_xmit_lock_key;
412static struct lock_class_key macvlan_netdev_addr_lock_key;
413
414#define MACVLAN_FEATURES \
415 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
416 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
417 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
418 NETIF_F_HW_VLAN_FILTER)
419
420#define MACVLAN_STATE_MASK \
421 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
422
423static void macvlan_set_lockdep_class_one(struct net_device *dev,
424 struct netdev_queue *txq,
425 void *_unused)
426{
427 lockdep_set_class(&txq->_xmit_lock,
428 &macvlan_netdev_xmit_lock_key);
429}
430
431static void macvlan_set_lockdep_class(struct net_device *dev)
432{
433 lockdep_set_class(&dev->addr_list_lock,
434 &macvlan_netdev_addr_lock_key);
435 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
436}
437
438static int macvlan_init(struct net_device *dev)
439{
440 struct macvlan_dev *vlan = netdev_priv(dev);
441 const struct net_device *lowerdev = vlan->lowerdev;
442
443 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
444 (lowerdev->state & MACVLAN_STATE_MASK);
445 dev->features = lowerdev->features & MACVLAN_FEATURES;
446 dev->features |= NETIF_F_LLTX;
447 dev->gso_max_size = lowerdev->gso_max_size;
448 dev->iflink = lowerdev->ifindex;
449 dev->hard_header_len = lowerdev->hard_header_len;
450
451 macvlan_set_lockdep_class(dev);
452
453 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
454 if (!vlan->pcpu_stats)
455 return -ENOMEM;
456
457 return 0;
458}
459
460static void macvlan_uninit(struct net_device *dev)
461{
462 struct macvlan_dev *vlan = netdev_priv(dev);
463 struct macvlan_port *port = vlan->port;
464
465 free_percpu(vlan->pcpu_stats);
466
467 port->count -= 1;
468 if (!port->count)
469 macvlan_port_destroy(port->dev);
470}
471
472static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
473 struct rtnl_link_stats64 *stats)
474{
475 struct macvlan_dev *vlan = netdev_priv(dev);
476
477 if (vlan->pcpu_stats) {
478 struct macvlan_pcpu_stats *p;
479 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
480 u32 rx_errors = 0, tx_dropped = 0;
481 unsigned int start;
482 int i;
483
484 for_each_possible_cpu(i) {
485 p = per_cpu_ptr(vlan->pcpu_stats, i);
486 do {
487 start = u64_stats_fetch_begin_bh(&p->syncp);
488 rx_packets = p->rx_packets;
489 rx_bytes = p->rx_bytes;
490 rx_multicast = p->rx_multicast;
491 tx_packets = p->tx_packets;
492 tx_bytes = p->tx_bytes;
493 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
494
495 stats->rx_packets += rx_packets;
496 stats->rx_bytes += rx_bytes;
497 stats->multicast += rx_multicast;
498 stats->tx_packets += tx_packets;
499 stats->tx_bytes += tx_bytes;
500 /* rx_errors & tx_dropped are u32, updated
501 * without syncp protection.
502 */
503 rx_errors += p->rx_errors;
504 tx_dropped += p->tx_dropped;
505 }
506 stats->rx_errors = rx_errors;
507 stats->rx_dropped = rx_errors;
508 stats->tx_dropped = tx_dropped;
509 }
510 return stats;
511}
512
513static void macvlan_vlan_rx_add_vid(struct net_device *dev,
514 unsigned short vid)
515{
516 struct macvlan_dev *vlan = netdev_priv(dev);
517 struct net_device *lowerdev = vlan->lowerdev;
518 const struct net_device_ops *ops = lowerdev->netdev_ops;
519
520 if (ops->ndo_vlan_rx_add_vid)
521 ops->ndo_vlan_rx_add_vid(lowerdev, vid);
522}
523
524static void macvlan_vlan_rx_kill_vid(struct net_device *dev,
525 unsigned short vid)
526{
527 struct macvlan_dev *vlan = netdev_priv(dev);
528 struct net_device *lowerdev = vlan->lowerdev;
529 const struct net_device_ops *ops = lowerdev->netdev_ops;
530
531 if (ops->ndo_vlan_rx_kill_vid)
532 ops->ndo_vlan_rx_kill_vid(lowerdev, vid);
533}
534
535static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
536 struct ethtool_drvinfo *drvinfo)
537{
538 snprintf(drvinfo->driver, 32, "macvlan");
539 snprintf(drvinfo->version, 32, "0.1");
540}
541
542static int macvlan_ethtool_get_settings(struct net_device *dev,
543 struct ethtool_cmd *cmd)
544{
545 const struct macvlan_dev *vlan = netdev_priv(dev);
546 return dev_ethtool_get_settings(vlan->lowerdev, cmd);
547}
548
549static const struct ethtool_ops macvlan_ethtool_ops = {
550 .get_link = ethtool_op_get_link,
551 .get_settings = macvlan_ethtool_get_settings,
552 .get_drvinfo = macvlan_ethtool_get_drvinfo,
553};
554
555static const struct net_device_ops macvlan_netdev_ops = {
556 .ndo_init = macvlan_init,
557 .ndo_uninit = macvlan_uninit,
558 .ndo_open = macvlan_open,
559 .ndo_stop = macvlan_stop,
560 .ndo_start_xmit = macvlan_start_xmit,
561 .ndo_change_mtu = macvlan_change_mtu,
562 .ndo_change_rx_flags = macvlan_change_rx_flags,
563 .ndo_set_mac_address = macvlan_set_mac_address,
564 .ndo_set_multicast_list = macvlan_set_multicast_list,
565 .ndo_get_stats64 = macvlan_dev_get_stats64,
566 .ndo_validate_addr = eth_validate_addr,
567 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
568 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
569};
570
571void macvlan_common_setup(struct net_device *dev)
572{
573 ether_setup(dev);
574
575 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
576 dev->netdev_ops = &macvlan_netdev_ops;
577 dev->destructor = free_netdev;
578 dev->header_ops = &macvlan_hard_header_ops,
579 dev->ethtool_ops = &macvlan_ethtool_ops;
580}
581EXPORT_SYMBOL_GPL(macvlan_common_setup);
582
583static void macvlan_setup(struct net_device *dev)
584{
585 macvlan_common_setup(dev);
586 dev->tx_queue_len = 0;
587}
588
589static int macvlan_port_create(struct net_device *dev)
590{
591 struct macvlan_port *port;
592 unsigned int i;
593 int err;
594
595 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
596 return -EINVAL;
597
598 port = kzalloc(sizeof(*port), GFP_KERNEL);
599 if (port == NULL)
600 return -ENOMEM;
601
602 port->passthru = false;
603 port->dev = dev;
604 INIT_LIST_HEAD(&port->vlans);
605 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
606 INIT_HLIST_HEAD(&port->vlan_hash[i]);
607
608 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
609 if (err)
610 kfree(port);
611 else
612 dev->priv_flags |= IFF_MACVLAN_PORT;
613 return err;
614}
615
616static void macvlan_port_destroy(struct net_device *dev)
617{
618 struct macvlan_port *port = macvlan_port_get(dev);
619
620 dev->priv_flags &= ~IFF_MACVLAN_PORT;
621 netdev_rx_handler_unregister(dev);
622 kfree_rcu(port, rcu);
623}
624
625static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
626{
627 if (tb[IFLA_ADDRESS]) {
628 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
629 return -EINVAL;
630 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
631 return -EADDRNOTAVAIL;
632 }
633
634 if (data && data[IFLA_MACVLAN_MODE]) {
635 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
636 case MACVLAN_MODE_PRIVATE:
637 case MACVLAN_MODE_VEPA:
638 case MACVLAN_MODE_BRIDGE:
639 case MACVLAN_MODE_PASSTHRU:
640 break;
641 default:
642 return -EINVAL;
643 }
644 }
645 return 0;
646}
647
648int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
649 struct nlattr *tb[], struct nlattr *data[],
650 int (*receive)(struct sk_buff *skb),
651 int (*forward)(struct net_device *dev,
652 struct sk_buff *skb))
653{
654 struct macvlan_dev *vlan = netdev_priv(dev);
655 struct macvlan_port *port;
656 struct net_device *lowerdev;
657 int err;
658
659 if (!tb[IFLA_LINK])
660 return -EINVAL;
661
662 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
663 if (lowerdev == NULL)
664 return -ENODEV;
665
666 /* When creating macvlans on top of other macvlans - use
667 * the real device as the lowerdev.
668 */
669 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
670 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
671 lowerdev = lowervlan->lowerdev;
672 }
673
674 if (!tb[IFLA_MTU])
675 dev->mtu = lowerdev->mtu;
676 else if (dev->mtu > lowerdev->mtu)
677 return -EINVAL;
678
679 if (!tb[IFLA_ADDRESS])
680 random_ether_addr(dev->dev_addr);
681
682 if (!macvlan_port_exists(lowerdev)) {
683 err = macvlan_port_create(lowerdev);
684 if (err < 0)
685 return err;
686 }
687 port = macvlan_port_get(lowerdev);
688
689 /* Only 1 macvlan device can be created in passthru mode */
690 if (port->passthru)
691 return -EINVAL;
692
693 vlan->lowerdev = lowerdev;
694 vlan->dev = dev;
695 vlan->port = port;
696 vlan->receive = receive;
697 vlan->forward = forward;
698
699 vlan->mode = MACVLAN_MODE_VEPA;
700 if (data && data[IFLA_MACVLAN_MODE])
701 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
702
703 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
704 if (port->count)
705 return -EINVAL;
706 port->passthru = true;
707 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
708 }
709
710 port->count += 1;
711 err = register_netdevice(dev);
712 if (err < 0)
713 goto destroy_port;
714
715 list_add_tail(&vlan->list, &port->vlans);
716 netif_stacked_transfer_operstate(lowerdev, dev);
717
718 return 0;
719
720destroy_port:
721 port->count -= 1;
722 if (!port->count)
723 macvlan_port_destroy(lowerdev);
724
725 return err;
726}
727EXPORT_SYMBOL_GPL(macvlan_common_newlink);
728
729static int macvlan_newlink(struct net *src_net, struct net_device *dev,
730 struct nlattr *tb[], struct nlattr *data[])
731{
732 return macvlan_common_newlink(src_net, dev, tb, data,
733 netif_rx,
734 dev_forward_skb);
735}
736
737void macvlan_dellink(struct net_device *dev, struct list_head *head)
738{
739 struct macvlan_dev *vlan = netdev_priv(dev);
740
741 list_del(&vlan->list);
742 unregister_netdevice_queue(dev, head);
743}
744EXPORT_SYMBOL_GPL(macvlan_dellink);
745
746static int macvlan_changelink(struct net_device *dev,
747 struct nlattr *tb[], struct nlattr *data[])
748{
749 struct macvlan_dev *vlan = netdev_priv(dev);
750 if (data && data[IFLA_MACVLAN_MODE])
751 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
752 return 0;
753}
754
755static size_t macvlan_get_size(const struct net_device *dev)
756{
757 return nla_total_size(4);
758}
759
760static int macvlan_fill_info(struct sk_buff *skb,
761 const struct net_device *dev)
762{
763 struct macvlan_dev *vlan = netdev_priv(dev);
764
765 NLA_PUT_U32(skb, IFLA_MACVLAN_MODE, vlan->mode);
766 return 0;
767
768nla_put_failure:
769 return -EMSGSIZE;
770}
771
772static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
773 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
774};
775
776int macvlan_link_register(struct rtnl_link_ops *ops)
777{
778 /* common fields */
779 ops->priv_size = sizeof(struct macvlan_dev);
780 ops->validate = macvlan_validate;
781 ops->maxtype = IFLA_MACVLAN_MAX;
782 ops->policy = macvlan_policy;
783 ops->changelink = macvlan_changelink;
784 ops->get_size = macvlan_get_size;
785 ops->fill_info = macvlan_fill_info;
786
787 return rtnl_link_register(ops);
788};
789EXPORT_SYMBOL_GPL(macvlan_link_register);
790
791static struct rtnl_link_ops macvlan_link_ops = {
792 .kind = "macvlan",
793 .setup = macvlan_setup,
794 .newlink = macvlan_newlink,
795 .dellink = macvlan_dellink,
796};
797
798static int macvlan_device_event(struct notifier_block *unused,
799 unsigned long event, void *ptr)
800{
801 struct net_device *dev = ptr;
802 struct macvlan_dev *vlan, *next;
803 struct macvlan_port *port;
804 LIST_HEAD(list_kill);
805
806 if (!macvlan_port_exists(dev))
807 return NOTIFY_DONE;
808
809 port = macvlan_port_get(dev);
810
811 switch (event) {
812 case NETDEV_CHANGE:
813 list_for_each_entry(vlan, &port->vlans, list)
814 netif_stacked_transfer_operstate(vlan->lowerdev,
815 vlan->dev);
816 break;
817 case NETDEV_FEAT_CHANGE:
818 list_for_each_entry(vlan, &port->vlans, list) {
819 vlan->dev->features = dev->features & MACVLAN_FEATURES;
820 vlan->dev->gso_max_size = dev->gso_max_size;
821 netdev_features_change(vlan->dev);
822 }
823 break;
824 case NETDEV_UNREGISTER:
825 /* twiddle thumbs on netns device moves */
826 if (dev->reg_state != NETREG_UNREGISTERING)
827 break;
828
829 list_for_each_entry_safe(vlan, next, &port->vlans, list)
830 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
831 unregister_netdevice_many(&list_kill);
832 list_del(&list_kill);
833 break;
834 case NETDEV_PRE_TYPE_CHANGE:
835 /* Forbid underlaying device to change its type. */
836 return NOTIFY_BAD;
837 }
838 return NOTIFY_DONE;
839}
840
841static struct notifier_block macvlan_notifier_block __read_mostly = {
842 .notifier_call = macvlan_device_event,
843};
844
845static int __init macvlan_init_module(void)
846{
847 int err;
848
849 register_netdevice_notifier(&macvlan_notifier_block);
850
851 err = macvlan_link_register(&macvlan_link_ops);
852 if (err < 0)
853 goto err1;
854 return 0;
855err1:
856 unregister_netdevice_notifier(&macvlan_notifier_block);
857 return err;
858}
859
860static void __exit macvlan_cleanup_module(void)
861{
862 rtnl_link_unregister(&macvlan_link_ops);
863 unregister_netdevice_notifier(&macvlan_notifier_block);
864}
865
866module_init(macvlan_init_module);
867module_exit(macvlan_cleanup_module);
868
869MODULE_LICENSE("GPL");
870MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
871MODULE_DESCRIPTION("Driver for MAC address based VLANs");
872MODULE_ALIAS_RTNL_LINK("macvlan");