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Merge tag 'drm/tegra/for-5.7-fixes' of git://anongit.freedesktop.org/tegra/linux...
[thirdparty/linux.git] / drivers / net / macvlan.c
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_BC_QUEUE_LEN 1000
39
40 #define MACVLAN_F_PASSTHRU 1
41 #define MACVLAN_F_ADDRCHANGE 2
42
43 struct 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 flags;
50 int count;
51 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
52 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
53 unsigned char perm_addr[ETH_ALEN];
54 };
55
56 struct macvlan_source_entry {
57 struct hlist_node hlist;
58 struct macvlan_dev *vlan;
59 unsigned char addr[6+2] __aligned(sizeof(u16));
60 struct rcu_head rcu;
61 };
62
63 struct macvlan_skb_cb {
64 const struct macvlan_dev *src;
65 };
66
67 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
68
69 static void macvlan_port_destroy(struct net_device *dev);
70
71 static inline bool macvlan_passthru(const struct macvlan_port *port)
72 {
73 return port->flags & MACVLAN_F_PASSTHRU;
74 }
75
76 static inline void macvlan_set_passthru(struct macvlan_port *port)
77 {
78 port->flags |= MACVLAN_F_PASSTHRU;
79 }
80
81 static inline bool macvlan_addr_change(const struct macvlan_port *port)
82 {
83 return port->flags & MACVLAN_F_ADDRCHANGE;
84 }
85
86 static inline void macvlan_set_addr_change(struct macvlan_port *port)
87 {
88 port->flags |= MACVLAN_F_ADDRCHANGE;
89 }
90
91 static inline void macvlan_clear_addr_change(struct macvlan_port *port)
92 {
93 port->flags &= ~MACVLAN_F_ADDRCHANGE;
94 }
95
96 /* Hash Ethernet address */
97 static u32 macvlan_eth_hash(const unsigned char *addr)
98 {
99 u64 value = get_unaligned((u64 *)addr);
100
101 /* only want 6 bytes */
102 #ifdef __BIG_ENDIAN
103 value >>= 16;
104 #else
105 value <<= 16;
106 #endif
107 return hash_64(value, MACVLAN_HASH_BITS);
108 }
109
110 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
111 {
112 return rcu_dereference(dev->rx_handler_data);
113 }
114
115 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
116 {
117 return rtnl_dereference(dev->rx_handler_data);
118 }
119
120 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
121 const unsigned char *addr)
122 {
123 struct macvlan_dev *vlan;
124 u32 idx = macvlan_eth_hash(addr);
125
126 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) {
127 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
128 return vlan;
129 }
130 return NULL;
131 }
132
133 static struct macvlan_source_entry *macvlan_hash_lookup_source(
134 const struct macvlan_dev *vlan,
135 const unsigned char *addr)
136 {
137 struct macvlan_source_entry *entry;
138 u32 idx = macvlan_eth_hash(addr);
139 struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
140
141 hlist_for_each_entry_rcu(entry, h, hlist) {
142 if (ether_addr_equal_64bits(entry->addr, addr) &&
143 entry->vlan == vlan)
144 return entry;
145 }
146 return NULL;
147 }
148
149 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
150 const unsigned char *addr)
151 {
152 struct macvlan_port *port = vlan->port;
153 struct macvlan_source_entry *entry;
154 struct hlist_head *h;
155
156 entry = macvlan_hash_lookup_source(vlan, addr);
157 if (entry)
158 return 0;
159
160 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
161 if (!entry)
162 return -ENOMEM;
163
164 ether_addr_copy(entry->addr, addr);
165 entry->vlan = vlan;
166 h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
167 hlist_add_head_rcu(&entry->hlist, h);
168 vlan->macaddr_count++;
169
170 return 0;
171 }
172
173 static void macvlan_hash_add(struct macvlan_dev *vlan)
174 {
175 struct macvlan_port *port = vlan->port;
176 const unsigned char *addr = vlan->dev->dev_addr;
177 u32 idx = macvlan_eth_hash(addr);
178
179 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
180 }
181
182 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
183 {
184 hlist_del_rcu(&entry->hlist);
185 kfree_rcu(entry, rcu);
186 }
187
188 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
189 {
190 hlist_del_rcu(&vlan->hlist);
191 if (sync)
192 synchronize_rcu();
193 }
194
195 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
196 const unsigned char *addr)
197 {
198 macvlan_hash_del(vlan, true);
199 /* Now that we are unhashed it is safe to change the device
200 * address without confusing packet delivery.
201 */
202 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
203 macvlan_hash_add(vlan);
204 }
205
206 static bool macvlan_addr_busy(const struct macvlan_port *port,
207 const unsigned char *addr)
208 {
209 /* Test to see if the specified address is
210 * currently in use by the underlying device or
211 * another macvlan.
212 */
213 if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
214 ether_addr_equal_64bits(port->dev->dev_addr, addr))
215 return true;
216
217 if (macvlan_hash_lookup(port, addr))
218 return true;
219
220 return false;
221 }
222
223
224 static int macvlan_broadcast_one(struct sk_buff *skb,
225 const struct macvlan_dev *vlan,
226 const struct ethhdr *eth, bool local)
227 {
228 struct net_device *dev = vlan->dev;
229
230 if (local)
231 return __dev_forward_skb(dev, skb);
232
233 skb->dev = dev;
234 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
235 skb->pkt_type = PACKET_BROADCAST;
236 else
237 skb->pkt_type = PACKET_MULTICAST;
238
239 return 0;
240 }
241
242 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
243 {
244 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
245 }
246
247
248 static unsigned int mc_hash(const struct macvlan_dev *vlan,
249 const unsigned char *addr)
250 {
251 u32 val = __get_unaligned_cpu32(addr + 2);
252
253 val ^= macvlan_hash_mix(vlan);
254 return hash_32(val, MACVLAN_MC_FILTER_BITS);
255 }
256
257 static void macvlan_broadcast(struct sk_buff *skb,
258 const struct macvlan_port *port,
259 struct net_device *src,
260 enum macvlan_mode mode)
261 {
262 const struct ethhdr *eth = eth_hdr(skb);
263 const struct macvlan_dev *vlan;
264 struct sk_buff *nskb;
265 unsigned int i;
266 int err;
267 unsigned int hash;
268
269 if (skb->protocol == htons(ETH_P_PAUSE))
270 return;
271
272 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
273 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
274 if (vlan->dev == src || !(vlan->mode & mode))
275 continue;
276
277 hash = mc_hash(vlan, eth->h_dest);
278 if (!test_bit(hash, vlan->mc_filter))
279 continue;
280
281 err = NET_RX_DROP;
282 nskb = skb_clone(skb, GFP_ATOMIC);
283 if (likely(nskb))
284 err = macvlan_broadcast_one(
285 nskb, vlan, eth,
286 mode == MACVLAN_MODE_BRIDGE) ?:
287 netif_rx_ni(nskb);
288 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
289 err == NET_RX_SUCCESS, true);
290 }
291 }
292 }
293
294 static void macvlan_process_broadcast(struct work_struct *w)
295 {
296 struct macvlan_port *port = container_of(w, struct macvlan_port,
297 bc_work);
298 struct sk_buff *skb;
299 struct sk_buff_head list;
300
301 __skb_queue_head_init(&list);
302
303 spin_lock_bh(&port->bc_queue.lock);
304 skb_queue_splice_tail_init(&port->bc_queue, &list);
305 spin_unlock_bh(&port->bc_queue.lock);
306
307 while ((skb = __skb_dequeue(&list))) {
308 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
309
310 rcu_read_lock();
311
312 if (!src)
313 /* frame comes from an external address */
314 macvlan_broadcast(skb, port, NULL,
315 MACVLAN_MODE_PRIVATE |
316 MACVLAN_MODE_VEPA |
317 MACVLAN_MODE_PASSTHRU|
318 MACVLAN_MODE_BRIDGE);
319 else if (src->mode == MACVLAN_MODE_VEPA)
320 /* flood to everyone except source */
321 macvlan_broadcast(skb, port, src->dev,
322 MACVLAN_MODE_VEPA |
323 MACVLAN_MODE_BRIDGE);
324 else
325 /*
326 * flood only to VEPA ports, bridge ports
327 * already saw the frame on the way out.
328 */
329 macvlan_broadcast(skb, port, src->dev,
330 MACVLAN_MODE_VEPA);
331
332 rcu_read_unlock();
333
334 if (src)
335 dev_put(src->dev);
336 consume_skb(skb);
337
338 cond_resched();
339 }
340 }
341
342 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
343 const struct macvlan_dev *src,
344 struct sk_buff *skb)
345 {
346 struct sk_buff *nskb;
347 int err = -ENOMEM;
348
349 nskb = skb_clone(skb, GFP_ATOMIC);
350 if (!nskb)
351 goto err;
352
353 MACVLAN_SKB_CB(nskb)->src = src;
354
355 spin_lock(&port->bc_queue.lock);
356 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
357 if (src)
358 dev_hold(src->dev);
359 __skb_queue_tail(&port->bc_queue, nskb);
360 err = 0;
361 }
362 spin_unlock(&port->bc_queue.lock);
363
364 schedule_work(&port->bc_work);
365
366 if (err)
367 goto free_nskb;
368
369 return;
370
371 free_nskb:
372 kfree_skb(nskb);
373 err:
374 atomic_long_inc(&skb->dev->rx_dropped);
375 }
376
377 static void macvlan_flush_sources(struct macvlan_port *port,
378 struct macvlan_dev *vlan)
379 {
380 int i;
381
382 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
383 struct hlist_node *h, *n;
384
385 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
386 struct macvlan_source_entry *entry;
387
388 entry = hlist_entry(h, struct macvlan_source_entry,
389 hlist);
390 if (entry->vlan == vlan)
391 macvlan_hash_del_source(entry);
392 }
393 }
394 vlan->macaddr_count = 0;
395 }
396
397 static void macvlan_forward_source_one(struct sk_buff *skb,
398 struct macvlan_dev *vlan)
399 {
400 struct sk_buff *nskb;
401 struct net_device *dev;
402 int len;
403 int ret;
404
405 dev = vlan->dev;
406 if (unlikely(!(dev->flags & IFF_UP)))
407 return;
408
409 nskb = skb_clone(skb, GFP_ATOMIC);
410 if (!nskb)
411 return;
412
413 len = nskb->len + ETH_HLEN;
414 nskb->dev = dev;
415
416 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
417 nskb->pkt_type = PACKET_HOST;
418
419 ret = netif_rx(nskb);
420 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
421 }
422
423 static void macvlan_forward_source(struct sk_buff *skb,
424 struct macvlan_port *port,
425 const unsigned char *addr)
426 {
427 struct macvlan_source_entry *entry;
428 u32 idx = macvlan_eth_hash(addr);
429 struct hlist_head *h = &port->vlan_source_hash[idx];
430
431 hlist_for_each_entry_rcu(entry, h, hlist) {
432 if (ether_addr_equal_64bits(entry->addr, addr))
433 macvlan_forward_source_one(skb, entry->vlan);
434 }
435 }
436
437 /* called under rcu_read_lock() from netif_receive_skb */
438 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
439 {
440 struct macvlan_port *port;
441 struct sk_buff *skb = *pskb;
442 const struct ethhdr *eth = eth_hdr(skb);
443 const struct macvlan_dev *vlan;
444 const struct macvlan_dev *src;
445 struct net_device *dev;
446 unsigned int len = 0;
447 int ret;
448 rx_handler_result_t handle_res;
449
450 port = macvlan_port_get_rcu(skb->dev);
451 if (is_multicast_ether_addr(eth->h_dest)) {
452 unsigned int hash;
453
454 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
455 if (!skb)
456 return RX_HANDLER_CONSUMED;
457 *pskb = skb;
458 eth = eth_hdr(skb);
459 macvlan_forward_source(skb, port, eth->h_source);
460 src = macvlan_hash_lookup(port, eth->h_source);
461 if (src && src->mode != MACVLAN_MODE_VEPA &&
462 src->mode != MACVLAN_MODE_BRIDGE) {
463 /* forward to original port. */
464 vlan = src;
465 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
466 netif_rx(skb);
467 handle_res = RX_HANDLER_CONSUMED;
468 goto out;
469 }
470
471 hash = mc_hash(NULL, eth->h_dest);
472 if (test_bit(hash, port->mc_filter))
473 macvlan_broadcast_enqueue(port, src, skb);
474
475 return RX_HANDLER_PASS;
476 }
477
478 macvlan_forward_source(skb, port, eth->h_source);
479 if (macvlan_passthru(port))
480 vlan = list_first_or_null_rcu(&port->vlans,
481 struct macvlan_dev, list);
482 else
483 vlan = macvlan_hash_lookup(port, eth->h_dest);
484 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
485 return RX_HANDLER_PASS;
486
487 dev = vlan->dev;
488 if (unlikely(!(dev->flags & IFF_UP))) {
489 kfree_skb(skb);
490 return RX_HANDLER_CONSUMED;
491 }
492 len = skb->len + ETH_HLEN;
493 skb = skb_share_check(skb, GFP_ATOMIC);
494 if (!skb) {
495 ret = NET_RX_DROP;
496 handle_res = RX_HANDLER_CONSUMED;
497 goto out;
498 }
499
500 *pskb = skb;
501 skb->dev = dev;
502 skb->pkt_type = PACKET_HOST;
503
504 ret = NET_RX_SUCCESS;
505 handle_res = RX_HANDLER_ANOTHER;
506 out:
507 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
508 return handle_res;
509 }
510
511 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
512 {
513 const struct macvlan_dev *vlan = netdev_priv(dev);
514 const struct macvlan_port *port = vlan->port;
515 const struct macvlan_dev *dest;
516
517 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
518 const struct ethhdr *eth = skb_eth_hdr(skb);
519
520 /* send to other bridge ports directly */
521 if (is_multicast_ether_addr(eth->h_dest)) {
522 skb_reset_mac_header(skb);
523 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
524 goto xmit_world;
525 }
526
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);
531
532 return NET_XMIT_SUCCESS;
533 }
534 }
535 xmit_world:
536 skb->dev = vlan->lowerdev;
537 return dev_queue_xmit_accel(skb,
538 netdev_get_sb_channel(dev) ? dev : NULL);
539 }
540
541 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
542 {
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;
550 }
551
552 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
553 struct net_device *dev)
554 {
555 struct macvlan_dev *vlan = netdev_priv(dev);
556 unsigned int len = skb->len;
557 int ret;
558
559 if (unlikely(netpoll_tx_running(dev)))
560 return macvlan_netpoll_send_skb(vlan, skb);
561
562 ret = macvlan_queue_xmit(skb, dev);
563
564 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
565 struct vlan_pcpu_stats *pcpu_stats;
566
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);
574 }
575 return ret;
576 }
577
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)
581 {
582 const struct macvlan_dev *vlan = netdev_priv(dev);
583 struct net_device *lowerdev = vlan->lowerdev;
584
585 return dev_hard_header(skb, lowerdev, type, daddr,
586 saddr ? : dev->dev_addr, len);
587 }
588
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,
594 };
595
596 static int macvlan_open(struct net_device *dev)
597 {
598 struct macvlan_dev *vlan = netdev_priv(dev);
599 struct net_device *lowerdev = vlan->lowerdev;
600 int err;
601
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;
607 }
608 goto hash_add;
609 }
610
611 err = -EADDRINUSE;
612 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
613 goto out;
614
615 /* Attempt to populate accel_priv which is used to offload the L2
616 * forwarding requests for unicast packets.
617 */
618 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
619 vlan->accel_priv =
620 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
621
622 /* If earlier attempt to offload failed, or accel_priv is not
623 * populated we must add the unicast address to the lower device.
624 */
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;
630 }
631
632 if (dev->flags & IFF_ALLMULTI) {
633 err = dev_set_allmulti(lowerdev, 1);
634 if (err < 0)
635 goto del_unicast;
636 }
637
638 if (dev->flags & IFF_PROMISC) {
639 err = dev_set_promiscuity(lowerdev, 1);
640 if (err < 0)
641 goto clear_multi;
642 }
643
644 hash_add:
645 macvlan_hash_add(vlan);
646 return 0;
647
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);
658 }
659 out:
660 return err;
661 }
662
663 static int macvlan_stop(struct net_device *dev)
664 {
665 struct macvlan_dev *vlan = netdev_priv(dev);
666 struct net_device *lowerdev = vlan->lowerdev;
667
668 if (vlan->accel_priv) {
669 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
670 vlan->accel_priv);
671 vlan->accel_priv = NULL;
672 }
673
674 dev_uc_unsync(lowerdev, dev);
675 dev_mc_unsync(lowerdev, dev);
676
677 if (macvlan_passthru(vlan->port)) {
678 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
679 dev_set_promiscuity(lowerdev, -1);
680 goto hash_del;
681 }
682
683 if (dev->flags & IFF_ALLMULTI)
684 dev_set_allmulti(lowerdev, -1);
685
686 if (dev->flags & IFF_PROMISC)
687 dev_set_promiscuity(lowerdev, -1);
688
689 dev_uc_del(lowerdev, dev->dev_addr);
690
691 hash_del:
692 macvlan_hash_del(vlan, !dev->dismantle);
693 return 0;
694 }
695
696 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
697 {
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;
702
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;
710
711 if (!macvlan_passthru(port)) {
712 err = dev_uc_add(lowerdev, addr);
713 if (err)
714 return err;
715
716 dev_uc_del(lowerdev, dev->dev_addr);
717 }
718
719 macvlan_hash_change_addr(vlan, addr);
720 }
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.
725 */
726 ether_addr_copy(vlan->port->perm_addr,
727 lowerdev->dev_addr);
728 }
729 macvlan_clear_addr_change(port);
730 return 0;
731 }
732
733 static int macvlan_set_mac_address(struct net_device *dev, void *p)
734 {
735 struct macvlan_dev *vlan = netdev_priv(dev);
736 struct sockaddr *addr = p;
737
738 if (!is_valid_ether_addr(addr->sa_data))
739 return -EADDRNOTAVAIL;
740
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;
744
745 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
746 macvlan_set_addr_change(vlan->port);
747 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
748 }
749
750 if (macvlan_addr_busy(vlan->port, addr->sa_data))
751 return -EADDRINUSE;
752
753 return macvlan_sync_address(dev, addr->sa_data);
754 }
755
756 static void macvlan_change_rx_flags(struct net_device *dev, int change)
757 {
758 struct macvlan_dev *vlan = netdev_priv(dev);
759 struct net_device *lowerdev = vlan->lowerdev;
760
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);
767
768 }
769 }
770
771 static void macvlan_compute_filter(unsigned long *mc_filter,
772 struct net_device *dev,
773 struct macvlan_dev *vlan)
774 {
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);
780
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);
784 }
785
786 __set_bit(mc_hash(vlan, dev->broadcast), filter);
787
788 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
789 }
790 }
791
792 static void macvlan_set_mac_lists(struct net_device *dev)
793 {
794 struct macvlan_dev *vlan = netdev_priv(dev);
795
796 macvlan_compute_filter(vlan->mc_filter, dev, vlan);
797
798 dev_uc_sync(vlan->lowerdev, dev);
799 dev_mc_sync(vlan->lowerdev, dev);
800
801 /* This is slightly inaccurate as we're including the subscription
802 * list of vlan->lowerdev too.
803 *
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.
807 *
808 * However, this is already broken as when you change your broadcast
809 * address we don't get called.
810 *
811 * The solution is to maintain a list of broadcast addresses like
812 * we do for uc/mc, if you care.
813 */
814 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
815 }
816
817 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
818 {
819 struct macvlan_dev *vlan = netdev_priv(dev);
820
821 if (vlan->lowerdev->mtu < new_mtu)
822 return -EINVAL;
823 dev->mtu = new_mtu;
824 return 0;
825 }
826
827 static int macvlan_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
828 {
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;
833
834 strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
835 ifrr.ifr_ifru = ifr->ifr_ifru;
836
837 switch (cmd) {
838 case SIOCSHWTSTAMP:
839 if (!net_eq(dev_net(dev), &init_net))
840 break;
841 /* fall through */
842 case SIOCGHWTSTAMP:
843 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
844 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
845 break;
846 }
847
848 if (!err)
849 ifr->ifr_ifru = ifrr.ifr_ifru;
850
851 return err;
852 }
853
854 /*
855 * macvlan network devices have devices nesting below it and are a special
856 * "super class" of normal network devices; split their locks off into a
857 * separate class since they always nest.
858 */
859 #define ALWAYS_ON_OFFLOADS \
860 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
861 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
862
863 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
864
865 #define MACVLAN_FEATURES \
866 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
867 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
868 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
869 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
870
871 #define MACVLAN_STATE_MASK \
872 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
873
874 static int macvlan_init(struct net_device *dev)
875 {
876 struct macvlan_dev *vlan = netdev_priv(dev);
877 const struct net_device *lowerdev = vlan->lowerdev;
878 struct macvlan_port *port = vlan->port;
879
880 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
881 (lowerdev->state & MACVLAN_STATE_MASK);
882 dev->features = lowerdev->features & MACVLAN_FEATURES;
883 dev->features |= ALWAYS_ON_FEATURES;
884 dev->hw_features |= NETIF_F_LRO;
885 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
886 dev->vlan_features |= ALWAYS_ON_OFFLOADS;
887 dev->hw_enc_features |= dev->features;
888 dev->gso_max_size = lowerdev->gso_max_size;
889 dev->gso_max_segs = lowerdev->gso_max_segs;
890 dev->hard_header_len = lowerdev->hard_header_len;
891
892 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
893 if (!vlan->pcpu_stats)
894 return -ENOMEM;
895
896 port->count += 1;
897
898 return 0;
899 }
900
901 static void macvlan_uninit(struct net_device *dev)
902 {
903 struct macvlan_dev *vlan = netdev_priv(dev);
904 struct macvlan_port *port = vlan->port;
905
906 free_percpu(vlan->pcpu_stats);
907
908 macvlan_flush_sources(port, vlan);
909 port->count -= 1;
910 if (!port->count)
911 macvlan_port_destroy(port->dev);
912 }
913
914 static void macvlan_dev_get_stats64(struct net_device *dev,
915 struct rtnl_link_stats64 *stats)
916 {
917 struct macvlan_dev *vlan = netdev_priv(dev);
918
919 if (vlan->pcpu_stats) {
920 struct vlan_pcpu_stats *p;
921 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
922 u32 rx_errors = 0, tx_dropped = 0;
923 unsigned int start;
924 int i;
925
926 for_each_possible_cpu(i) {
927 p = per_cpu_ptr(vlan->pcpu_stats, i);
928 do {
929 start = u64_stats_fetch_begin_irq(&p->syncp);
930 rx_packets = p->rx_packets;
931 rx_bytes = p->rx_bytes;
932 rx_multicast = p->rx_multicast;
933 tx_packets = p->tx_packets;
934 tx_bytes = p->tx_bytes;
935 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
936
937 stats->rx_packets += rx_packets;
938 stats->rx_bytes += rx_bytes;
939 stats->multicast += rx_multicast;
940 stats->tx_packets += tx_packets;
941 stats->tx_bytes += tx_bytes;
942 /* rx_errors & tx_dropped are u32, updated
943 * without syncp protection.
944 */
945 rx_errors += p->rx_errors;
946 tx_dropped += p->tx_dropped;
947 }
948 stats->rx_errors = rx_errors;
949 stats->rx_dropped = rx_errors;
950 stats->tx_dropped = tx_dropped;
951 }
952 }
953
954 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
955 __be16 proto, u16 vid)
956 {
957 struct macvlan_dev *vlan = netdev_priv(dev);
958 struct net_device *lowerdev = vlan->lowerdev;
959
960 return vlan_vid_add(lowerdev, proto, vid);
961 }
962
963 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
964 __be16 proto, u16 vid)
965 {
966 struct macvlan_dev *vlan = netdev_priv(dev);
967 struct net_device *lowerdev = vlan->lowerdev;
968
969 vlan_vid_del(lowerdev, proto, vid);
970 return 0;
971 }
972
973 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
974 struct net_device *dev,
975 const unsigned char *addr, u16 vid,
976 u16 flags,
977 struct netlink_ext_ack *extack)
978 {
979 struct macvlan_dev *vlan = netdev_priv(dev);
980 int err = -EINVAL;
981
982 /* Support unicast filter only on passthru devices.
983 * Multicast filter should be allowed on all devices.
984 */
985 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
986 return -EOPNOTSUPP;
987
988 if (flags & NLM_F_REPLACE)
989 return -EOPNOTSUPP;
990
991 if (is_unicast_ether_addr(addr))
992 err = dev_uc_add_excl(dev, addr);
993 else if (is_multicast_ether_addr(addr))
994 err = dev_mc_add_excl(dev, addr);
995
996 return err;
997 }
998
999 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1000 struct net_device *dev,
1001 const unsigned char *addr, u16 vid)
1002 {
1003 struct macvlan_dev *vlan = netdev_priv(dev);
1004 int err = -EINVAL;
1005
1006 /* Support unicast filter only on passthru devices.
1007 * Multicast filter should be allowed on all devices.
1008 */
1009 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1010 return -EOPNOTSUPP;
1011
1012 if (is_unicast_ether_addr(addr))
1013 err = dev_uc_del(dev, addr);
1014 else if (is_multicast_ether_addr(addr))
1015 err = dev_mc_del(dev, addr);
1016
1017 return err;
1018 }
1019
1020 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1021 struct ethtool_drvinfo *drvinfo)
1022 {
1023 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1024 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1025 }
1026
1027 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1028 struct ethtool_link_ksettings *cmd)
1029 {
1030 const struct macvlan_dev *vlan = netdev_priv(dev);
1031
1032 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1033 }
1034
1035 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1036 struct ethtool_ts_info *info)
1037 {
1038 struct net_device *real_dev = macvlan_dev_real_dev(dev);
1039 const struct ethtool_ops *ops = real_dev->ethtool_ops;
1040 struct phy_device *phydev = real_dev->phydev;
1041
1042 if (phy_has_tsinfo(phydev)) {
1043 return phy_ts_info(phydev, info);
1044 } else if (ops->get_ts_info) {
1045 return ops->get_ts_info(real_dev, info);
1046 } else {
1047 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1048 SOF_TIMESTAMPING_SOFTWARE;
1049 info->phc_index = -1;
1050 }
1051
1052 return 0;
1053 }
1054
1055 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1056 netdev_features_t features)
1057 {
1058 struct macvlan_dev *vlan = netdev_priv(dev);
1059 netdev_features_t lowerdev_features = vlan->lowerdev->features;
1060 netdev_features_t mask;
1061
1062 features |= NETIF_F_ALL_FOR_ALL;
1063 features &= (vlan->set_features | ~MACVLAN_FEATURES);
1064 mask = features;
1065
1066 lowerdev_features &= (features | ~NETIF_F_LRO);
1067 features = netdev_increment_features(lowerdev_features, features, mask);
1068 features |= ALWAYS_ON_FEATURES;
1069 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1070
1071 return features;
1072 }
1073
1074 #ifdef CONFIG_NET_POLL_CONTROLLER
1075 static void macvlan_dev_poll_controller(struct net_device *dev)
1076 {
1077 return;
1078 }
1079
1080 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1081 {
1082 struct macvlan_dev *vlan = netdev_priv(dev);
1083 struct net_device *real_dev = vlan->lowerdev;
1084 struct netpoll *netpoll;
1085 int err = 0;
1086
1087 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1088 err = -ENOMEM;
1089 if (!netpoll)
1090 goto out;
1091
1092 err = __netpoll_setup(netpoll, real_dev);
1093 if (err) {
1094 kfree(netpoll);
1095 goto out;
1096 }
1097
1098 vlan->netpoll = netpoll;
1099
1100 out:
1101 return err;
1102 }
1103
1104 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1105 {
1106 struct macvlan_dev *vlan = netdev_priv(dev);
1107 struct netpoll *netpoll = vlan->netpoll;
1108
1109 if (!netpoll)
1110 return;
1111
1112 vlan->netpoll = NULL;
1113
1114 __netpoll_free(netpoll);
1115 }
1116 #endif /* CONFIG_NET_POLL_CONTROLLER */
1117
1118 static int macvlan_dev_get_iflink(const struct net_device *dev)
1119 {
1120 struct macvlan_dev *vlan = netdev_priv(dev);
1121
1122 return vlan->lowerdev->ifindex;
1123 }
1124
1125 static const struct ethtool_ops macvlan_ethtool_ops = {
1126 .get_link = ethtool_op_get_link,
1127 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1128 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1129 .get_ts_info = macvlan_ethtool_get_ts_info,
1130 };
1131
1132 static const struct net_device_ops macvlan_netdev_ops = {
1133 .ndo_init = macvlan_init,
1134 .ndo_uninit = macvlan_uninit,
1135 .ndo_open = macvlan_open,
1136 .ndo_stop = macvlan_stop,
1137 .ndo_start_xmit = macvlan_start_xmit,
1138 .ndo_change_mtu = macvlan_change_mtu,
1139 .ndo_do_ioctl = macvlan_do_ioctl,
1140 .ndo_fix_features = macvlan_fix_features,
1141 .ndo_change_rx_flags = macvlan_change_rx_flags,
1142 .ndo_set_mac_address = macvlan_set_mac_address,
1143 .ndo_set_rx_mode = macvlan_set_mac_lists,
1144 .ndo_get_stats64 = macvlan_dev_get_stats64,
1145 .ndo_validate_addr = eth_validate_addr,
1146 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1147 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1148 .ndo_fdb_add = macvlan_fdb_add,
1149 .ndo_fdb_del = macvlan_fdb_del,
1150 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1151 #ifdef CONFIG_NET_POLL_CONTROLLER
1152 .ndo_poll_controller = macvlan_dev_poll_controller,
1153 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1154 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1155 #endif
1156 .ndo_get_iflink = macvlan_dev_get_iflink,
1157 .ndo_features_check = passthru_features_check,
1158 .ndo_change_proto_down = dev_change_proto_down_generic,
1159 };
1160
1161 void macvlan_common_setup(struct net_device *dev)
1162 {
1163 ether_setup(dev);
1164
1165 dev->min_mtu = 0;
1166 dev->max_mtu = ETH_MAX_MTU;
1167 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1168 netif_keep_dst(dev);
1169 dev->priv_flags |= IFF_UNICAST_FLT;
1170 dev->netdev_ops = &macvlan_netdev_ops;
1171 dev->needs_free_netdev = true;
1172 dev->header_ops = &macvlan_hard_header_ops;
1173 dev->ethtool_ops = &macvlan_ethtool_ops;
1174 }
1175 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1176
1177 static void macvlan_setup(struct net_device *dev)
1178 {
1179 macvlan_common_setup(dev);
1180 dev->priv_flags |= IFF_NO_QUEUE;
1181 }
1182
1183 static int macvlan_port_create(struct net_device *dev)
1184 {
1185 struct macvlan_port *port;
1186 unsigned int i;
1187 int err;
1188
1189 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1190 return -EINVAL;
1191
1192 if (netdev_is_rx_handler_busy(dev))
1193 return -EBUSY;
1194
1195 port = kzalloc(sizeof(*port), GFP_KERNEL);
1196 if (port == NULL)
1197 return -ENOMEM;
1198
1199 port->dev = dev;
1200 ether_addr_copy(port->perm_addr, dev->dev_addr);
1201 INIT_LIST_HEAD(&port->vlans);
1202 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1203 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1204 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1205 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1206
1207 skb_queue_head_init(&port->bc_queue);
1208 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1209
1210 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1211 if (err)
1212 kfree(port);
1213 else
1214 dev->priv_flags |= IFF_MACVLAN_PORT;
1215 return err;
1216 }
1217
1218 static void macvlan_port_destroy(struct net_device *dev)
1219 {
1220 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1221 struct sk_buff *skb;
1222
1223 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1224 netdev_rx_handler_unregister(dev);
1225
1226 /* After this point, no packet can schedule bc_work anymore,
1227 * but we need to cancel it and purge left skbs if any.
1228 */
1229 cancel_work_sync(&port->bc_work);
1230
1231 while ((skb = __skb_dequeue(&port->bc_queue))) {
1232 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1233
1234 if (src)
1235 dev_put(src->dev);
1236
1237 kfree_skb(skb);
1238 }
1239
1240 /* If the lower device address has been changed by passthru
1241 * macvlan, put it back.
1242 */
1243 if (macvlan_passthru(port) &&
1244 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1245 struct sockaddr sa;
1246
1247 sa.sa_family = port->dev->type;
1248 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1249 dev_set_mac_address(port->dev, &sa, NULL);
1250 }
1251
1252 kfree(port);
1253 }
1254
1255 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1256 struct netlink_ext_ack *extack)
1257 {
1258 if (tb[IFLA_ADDRESS]) {
1259 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1260 return -EINVAL;
1261 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1262 return -EADDRNOTAVAIL;
1263 }
1264
1265 if (!data)
1266 return 0;
1267
1268 if (data[IFLA_MACVLAN_FLAGS] &&
1269 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1270 return -EINVAL;
1271
1272 if (data[IFLA_MACVLAN_MODE]) {
1273 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1274 case MACVLAN_MODE_PRIVATE:
1275 case MACVLAN_MODE_VEPA:
1276 case MACVLAN_MODE_BRIDGE:
1277 case MACVLAN_MODE_PASSTHRU:
1278 case MACVLAN_MODE_SOURCE:
1279 break;
1280 default:
1281 return -EINVAL;
1282 }
1283 }
1284
1285 if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1286 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1287 case MACVLAN_MACADDR_ADD:
1288 case MACVLAN_MACADDR_DEL:
1289 case MACVLAN_MACADDR_FLUSH:
1290 case MACVLAN_MACADDR_SET:
1291 break;
1292 default:
1293 return -EINVAL;
1294 }
1295 }
1296
1297 if (data[IFLA_MACVLAN_MACADDR]) {
1298 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1299 return -EINVAL;
1300
1301 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1302 return -EADDRNOTAVAIL;
1303 }
1304
1305 if (data[IFLA_MACVLAN_MACADDR_COUNT])
1306 return -EINVAL;
1307
1308 return 0;
1309 }
1310
1311 /**
1312 * reconfigure list of remote source mac address
1313 * (only for macvlan devices in source mode)
1314 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1315 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1316 */
1317 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1318 struct nlattr *data[])
1319 {
1320 char *addr = NULL;
1321 int ret, rem, len;
1322 struct nlattr *nla, *head;
1323 struct macvlan_source_entry *entry;
1324
1325 if (data[IFLA_MACVLAN_MACADDR])
1326 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1327
1328 if (mode == MACVLAN_MACADDR_ADD) {
1329 if (!addr)
1330 return -EINVAL;
1331
1332 return macvlan_hash_add_source(vlan, addr);
1333
1334 } else if (mode == MACVLAN_MACADDR_DEL) {
1335 if (!addr)
1336 return -EINVAL;
1337
1338 entry = macvlan_hash_lookup_source(vlan, addr);
1339 if (entry) {
1340 macvlan_hash_del_source(entry);
1341 vlan->macaddr_count--;
1342 }
1343 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1344 macvlan_flush_sources(vlan->port, vlan);
1345 } else if (mode == MACVLAN_MACADDR_SET) {
1346 macvlan_flush_sources(vlan->port, vlan);
1347
1348 if (addr) {
1349 ret = macvlan_hash_add_source(vlan, addr);
1350 if (ret)
1351 return ret;
1352 }
1353
1354 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1355 return 0;
1356
1357 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1358 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1359
1360 nla_for_each_attr(nla, head, len, rem) {
1361 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1362 nla_len(nla) != ETH_ALEN)
1363 continue;
1364
1365 addr = nla_data(nla);
1366 ret = macvlan_hash_add_source(vlan, addr);
1367 if (ret)
1368 return ret;
1369 }
1370 } else {
1371 return -EINVAL;
1372 }
1373
1374 return 0;
1375 }
1376
1377 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1378 struct nlattr *tb[], struct nlattr *data[],
1379 struct netlink_ext_ack *extack)
1380 {
1381 struct macvlan_dev *vlan = netdev_priv(dev);
1382 struct macvlan_port *port;
1383 struct net_device *lowerdev;
1384 int err;
1385 int macmode;
1386 bool create = false;
1387
1388 if (!tb[IFLA_LINK])
1389 return -EINVAL;
1390
1391 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1392 if (lowerdev == NULL)
1393 return -ENODEV;
1394
1395 /* When creating macvlans or macvtaps on top of other macvlans - use
1396 * the real device as the lowerdev.
1397 */
1398 if (netif_is_macvlan(lowerdev))
1399 lowerdev = macvlan_dev_real_dev(lowerdev);
1400
1401 if (!tb[IFLA_MTU])
1402 dev->mtu = lowerdev->mtu;
1403 else if (dev->mtu > lowerdev->mtu)
1404 return -EINVAL;
1405
1406 /* MTU range: 68 - lowerdev->max_mtu */
1407 dev->min_mtu = ETH_MIN_MTU;
1408 dev->max_mtu = lowerdev->max_mtu;
1409
1410 if (!tb[IFLA_ADDRESS])
1411 eth_hw_addr_random(dev);
1412
1413 if (!netif_is_macvlan_port(lowerdev)) {
1414 err = macvlan_port_create(lowerdev);
1415 if (err < 0)
1416 return err;
1417 create = true;
1418 }
1419 port = macvlan_port_get_rtnl(lowerdev);
1420
1421 /* Only 1 macvlan device can be created in passthru mode */
1422 if (macvlan_passthru(port)) {
1423 /* The macvlan port must be not created this time,
1424 * still goto destroy_macvlan_port for readability.
1425 */
1426 err = -EINVAL;
1427 goto destroy_macvlan_port;
1428 }
1429
1430 vlan->lowerdev = lowerdev;
1431 vlan->dev = dev;
1432 vlan->port = port;
1433 vlan->set_features = MACVLAN_FEATURES;
1434
1435 vlan->mode = MACVLAN_MODE_VEPA;
1436 if (data && data[IFLA_MACVLAN_MODE])
1437 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1438
1439 if (data && data[IFLA_MACVLAN_FLAGS])
1440 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1441
1442 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1443 if (port->count) {
1444 err = -EINVAL;
1445 goto destroy_macvlan_port;
1446 }
1447 macvlan_set_passthru(port);
1448 eth_hw_addr_inherit(dev, lowerdev);
1449 }
1450
1451 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1452 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1453 err = -EINVAL;
1454 goto destroy_macvlan_port;
1455 }
1456 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1457 err = macvlan_changelink_sources(vlan, macmode, data);
1458 if (err)
1459 goto destroy_macvlan_port;
1460 }
1461
1462 err = register_netdevice(dev);
1463 if (err < 0)
1464 goto destroy_macvlan_port;
1465
1466 dev->priv_flags |= IFF_MACVLAN;
1467 err = netdev_upper_dev_link(lowerdev, dev, extack);
1468 if (err)
1469 goto unregister_netdev;
1470
1471 list_add_tail_rcu(&vlan->list, &port->vlans);
1472 netif_stacked_transfer_operstate(lowerdev, dev);
1473 linkwatch_fire_event(dev);
1474
1475 return 0;
1476
1477 unregister_netdev:
1478 /* macvlan_uninit would free the macvlan port */
1479 unregister_netdevice(dev);
1480 return err;
1481 destroy_macvlan_port:
1482 /* the macvlan port may be freed by macvlan_uninit when fail to register.
1483 * so we destroy the macvlan port only when it's valid.
1484 */
1485 if (create && macvlan_port_get_rtnl(lowerdev))
1486 macvlan_port_destroy(port->dev);
1487 return err;
1488 }
1489 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1490
1491 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1492 struct nlattr *tb[], struct nlattr *data[],
1493 struct netlink_ext_ack *extack)
1494 {
1495 return macvlan_common_newlink(src_net, dev, tb, data, extack);
1496 }
1497
1498 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1499 {
1500 struct macvlan_dev *vlan = netdev_priv(dev);
1501
1502 if (vlan->mode == MACVLAN_MODE_SOURCE)
1503 macvlan_flush_sources(vlan->port, vlan);
1504 list_del_rcu(&vlan->list);
1505 unregister_netdevice_queue(dev, head);
1506 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1507 }
1508 EXPORT_SYMBOL_GPL(macvlan_dellink);
1509
1510 static int macvlan_changelink(struct net_device *dev,
1511 struct nlattr *tb[], struct nlattr *data[],
1512 struct netlink_ext_ack *extack)
1513 {
1514 struct macvlan_dev *vlan = netdev_priv(dev);
1515 enum macvlan_mode mode;
1516 bool set_mode = false;
1517 enum macvlan_macaddr_mode macmode;
1518 int ret;
1519
1520 /* Validate mode, but don't set yet: setting flags may fail. */
1521 if (data && data[IFLA_MACVLAN_MODE]) {
1522 set_mode = true;
1523 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1524 /* Passthrough mode can't be set or cleared dynamically */
1525 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1526 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1527 return -EINVAL;
1528 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1529 vlan->mode != mode)
1530 macvlan_flush_sources(vlan->port, vlan);
1531 }
1532
1533 if (data && data[IFLA_MACVLAN_FLAGS]) {
1534 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1535 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1536 if (macvlan_passthru(vlan->port) && promisc) {
1537 int err;
1538
1539 if (flags & MACVLAN_FLAG_NOPROMISC)
1540 err = dev_set_promiscuity(vlan->lowerdev, -1);
1541 else
1542 err = dev_set_promiscuity(vlan->lowerdev, 1);
1543 if (err < 0)
1544 return err;
1545 }
1546 vlan->flags = flags;
1547 }
1548 if (set_mode)
1549 vlan->mode = mode;
1550 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1551 if (vlan->mode != MACVLAN_MODE_SOURCE)
1552 return -EINVAL;
1553 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1554 ret = macvlan_changelink_sources(vlan, macmode, data);
1555 if (ret)
1556 return ret;
1557 }
1558 return 0;
1559 }
1560
1561 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1562 {
1563 if (vlan->macaddr_count == 0)
1564 return 0;
1565 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1566 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1567 }
1568
1569 static size_t macvlan_get_size(const struct net_device *dev)
1570 {
1571 struct macvlan_dev *vlan = netdev_priv(dev);
1572
1573 return (0
1574 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1575 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1576 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1577 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1578 );
1579 }
1580
1581 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1582 const struct macvlan_dev *vlan,
1583 const int i)
1584 {
1585 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1586 struct macvlan_source_entry *entry;
1587
1588 hlist_for_each_entry_rcu(entry, h, hlist) {
1589 if (entry->vlan != vlan)
1590 continue;
1591 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1592 return 1;
1593 }
1594 return 0;
1595 }
1596
1597 static int macvlan_fill_info(struct sk_buff *skb,
1598 const struct net_device *dev)
1599 {
1600 struct macvlan_dev *vlan = netdev_priv(dev);
1601 int i;
1602 struct nlattr *nest;
1603
1604 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1605 goto nla_put_failure;
1606 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1607 goto nla_put_failure;
1608 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1609 goto nla_put_failure;
1610 if (vlan->macaddr_count > 0) {
1611 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1612 if (nest == NULL)
1613 goto nla_put_failure;
1614
1615 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1616 if (macvlan_fill_info_macaddr(skb, vlan, i))
1617 goto nla_put_failure;
1618 }
1619 nla_nest_end(skb, nest);
1620 }
1621 return 0;
1622
1623 nla_put_failure:
1624 return -EMSGSIZE;
1625 }
1626
1627 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1628 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1629 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1630 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1631 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1632 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1633 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1634 };
1635
1636 int macvlan_link_register(struct rtnl_link_ops *ops)
1637 {
1638 /* common fields */
1639 ops->validate = macvlan_validate;
1640 ops->maxtype = IFLA_MACVLAN_MAX;
1641 ops->policy = macvlan_policy;
1642 ops->changelink = macvlan_changelink;
1643 ops->get_size = macvlan_get_size;
1644 ops->fill_info = macvlan_fill_info;
1645
1646 return rtnl_link_register(ops);
1647 };
1648 EXPORT_SYMBOL_GPL(macvlan_link_register);
1649
1650 static struct net *macvlan_get_link_net(const struct net_device *dev)
1651 {
1652 return dev_net(macvlan_dev_real_dev(dev));
1653 }
1654
1655 static struct rtnl_link_ops macvlan_link_ops = {
1656 .kind = "macvlan",
1657 .setup = macvlan_setup,
1658 .newlink = macvlan_newlink,
1659 .dellink = macvlan_dellink,
1660 .get_link_net = macvlan_get_link_net,
1661 .priv_size = sizeof(struct macvlan_dev),
1662 };
1663
1664 static int macvlan_device_event(struct notifier_block *unused,
1665 unsigned long event, void *ptr)
1666 {
1667 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1668 struct macvlan_dev *vlan, *next;
1669 struct macvlan_port *port;
1670 LIST_HEAD(list_kill);
1671
1672 if (!netif_is_macvlan_port(dev))
1673 return NOTIFY_DONE;
1674
1675 port = macvlan_port_get_rtnl(dev);
1676
1677 switch (event) {
1678 case NETDEV_UP:
1679 case NETDEV_DOWN:
1680 case NETDEV_CHANGE:
1681 list_for_each_entry(vlan, &port->vlans, list)
1682 netif_stacked_transfer_operstate(vlan->lowerdev,
1683 vlan->dev);
1684 break;
1685 case NETDEV_FEAT_CHANGE:
1686 list_for_each_entry(vlan, &port->vlans, list) {
1687 vlan->dev->gso_max_size = dev->gso_max_size;
1688 vlan->dev->gso_max_segs = dev->gso_max_segs;
1689 netdev_update_features(vlan->dev);
1690 }
1691 break;
1692 case NETDEV_CHANGEMTU:
1693 list_for_each_entry(vlan, &port->vlans, list) {
1694 if (vlan->dev->mtu <= dev->mtu)
1695 continue;
1696 dev_set_mtu(vlan->dev, dev->mtu);
1697 }
1698 break;
1699 case NETDEV_CHANGEADDR:
1700 if (!macvlan_passthru(port))
1701 return NOTIFY_DONE;
1702
1703 vlan = list_first_entry_or_null(&port->vlans,
1704 struct macvlan_dev,
1705 list);
1706
1707 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
1708 return NOTIFY_BAD;
1709
1710 break;
1711 case NETDEV_UNREGISTER:
1712 /* twiddle thumbs on netns device moves */
1713 if (dev->reg_state != NETREG_UNREGISTERING)
1714 break;
1715
1716 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1717 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1718 unregister_netdevice_many(&list_kill);
1719 break;
1720 case NETDEV_PRE_TYPE_CHANGE:
1721 /* Forbid underlaying device to change its type. */
1722 return NOTIFY_BAD;
1723
1724 case NETDEV_NOTIFY_PEERS:
1725 case NETDEV_BONDING_FAILOVER:
1726 case NETDEV_RESEND_IGMP:
1727 /* Propagate to all vlans */
1728 list_for_each_entry(vlan, &port->vlans, list)
1729 call_netdevice_notifiers(event, vlan->dev);
1730 }
1731 return NOTIFY_DONE;
1732 }
1733
1734 static struct notifier_block macvlan_notifier_block __read_mostly = {
1735 .notifier_call = macvlan_device_event,
1736 };
1737
1738 static int __init macvlan_init_module(void)
1739 {
1740 int err;
1741
1742 register_netdevice_notifier(&macvlan_notifier_block);
1743
1744 err = macvlan_link_register(&macvlan_link_ops);
1745 if (err < 0)
1746 goto err1;
1747 return 0;
1748 err1:
1749 unregister_netdevice_notifier(&macvlan_notifier_block);
1750 return err;
1751 }
1752
1753 static void __exit macvlan_cleanup_module(void)
1754 {
1755 rtnl_link_unregister(&macvlan_link_ops);
1756 unregister_netdevice_notifier(&macvlan_notifier_block);
1757 }
1758
1759 module_init(macvlan_init_module);
1760 module_exit(macvlan_cleanup_module);
1761
1762 MODULE_LICENSE("GPL");
1763 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1764 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1765 MODULE_ALIAS_RTNL_LINK("macvlan");
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