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net: pcs: xpcs: convert to mdio_device
[mirror_ubuntu-jammy-kernel.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_DEFAULT_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 bc_queue_len_used;
50 u32 flags;
51 int count;
52 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
53 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
54 unsigned char perm_addr[ETH_ALEN];
55 };
56
57 struct macvlan_source_entry {
58 struct hlist_node hlist;
59 struct macvlan_dev *vlan;
60 unsigned char addr[6+2] __aligned(sizeof(u16));
61 struct rcu_head rcu;
62 };
63
64 struct macvlan_skb_cb {
65 const struct macvlan_dev *src;
66 };
67
68 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
69
70 static void macvlan_port_destroy(struct net_device *dev);
71 static void update_port_bc_queue_len(struct macvlan_port *port);
72
73 static inline bool macvlan_passthru(const struct macvlan_port *port)
74 {
75 return port->flags & MACVLAN_F_PASSTHRU;
76 }
77
78 static inline void macvlan_set_passthru(struct macvlan_port *port)
79 {
80 port->flags |= MACVLAN_F_PASSTHRU;
81 }
82
83 static inline bool macvlan_addr_change(const struct macvlan_port *port)
84 {
85 return port->flags & MACVLAN_F_ADDRCHANGE;
86 }
87
88 static inline void macvlan_set_addr_change(struct macvlan_port *port)
89 {
90 port->flags |= MACVLAN_F_ADDRCHANGE;
91 }
92
93 static inline void macvlan_clear_addr_change(struct macvlan_port *port)
94 {
95 port->flags &= ~MACVLAN_F_ADDRCHANGE;
96 }
97
98 /* Hash Ethernet address */
99 static u32 macvlan_eth_hash(const unsigned char *addr)
100 {
101 u64 value = get_unaligned((u64 *)addr);
102
103 /* only want 6 bytes */
104 #ifdef __BIG_ENDIAN
105 value >>= 16;
106 #else
107 value <<= 16;
108 #endif
109 return hash_64(value, MACVLAN_HASH_BITS);
110 }
111
112 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
113 {
114 return rcu_dereference(dev->rx_handler_data);
115 }
116
117 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
118 {
119 return rtnl_dereference(dev->rx_handler_data);
120 }
121
122 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
123 const unsigned char *addr)
124 {
125 struct macvlan_dev *vlan;
126 u32 idx = macvlan_eth_hash(addr);
127
128 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist,
129 lockdep_rtnl_is_held()) {
130 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
131 return vlan;
132 }
133 return NULL;
134 }
135
136 static struct macvlan_source_entry *macvlan_hash_lookup_source(
137 const struct macvlan_dev *vlan,
138 const unsigned char *addr)
139 {
140 struct macvlan_source_entry *entry;
141 u32 idx = macvlan_eth_hash(addr);
142 struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
143
144 hlist_for_each_entry_rcu(entry, h, hlist) {
145 if (ether_addr_equal_64bits(entry->addr, addr) &&
146 entry->vlan == vlan)
147 return entry;
148 }
149 return NULL;
150 }
151
152 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
153 const unsigned char *addr)
154 {
155 struct macvlan_port *port = vlan->port;
156 struct macvlan_source_entry *entry;
157 struct hlist_head *h;
158
159 entry = macvlan_hash_lookup_source(vlan, addr);
160 if (entry)
161 return 0;
162
163 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
164 if (!entry)
165 return -ENOMEM;
166
167 ether_addr_copy(entry->addr, addr);
168 entry->vlan = vlan;
169 h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
170 hlist_add_head_rcu(&entry->hlist, h);
171 vlan->macaddr_count++;
172
173 return 0;
174 }
175
176 static void macvlan_hash_add(struct macvlan_dev *vlan)
177 {
178 struct macvlan_port *port = vlan->port;
179 const unsigned char *addr = vlan->dev->dev_addr;
180 u32 idx = macvlan_eth_hash(addr);
181
182 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
183 }
184
185 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
186 {
187 hlist_del_rcu(&entry->hlist);
188 kfree_rcu(entry, rcu);
189 }
190
191 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
192 {
193 hlist_del_rcu(&vlan->hlist);
194 if (sync)
195 synchronize_rcu();
196 }
197
198 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
199 const unsigned char *addr)
200 {
201 macvlan_hash_del(vlan, true);
202 /* Now that we are unhashed it is safe to change the device
203 * address without confusing packet delivery.
204 */
205 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
206 macvlan_hash_add(vlan);
207 }
208
209 static bool macvlan_addr_busy(const struct macvlan_port *port,
210 const unsigned char *addr)
211 {
212 /* Test to see if the specified address is
213 * currently in use by the underlying device or
214 * another macvlan.
215 */
216 if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
217 ether_addr_equal_64bits(port->dev->dev_addr, addr))
218 return true;
219
220 if (macvlan_hash_lookup(port, addr))
221 return true;
222
223 return false;
224 }
225
226
227 static int macvlan_broadcast_one(struct sk_buff *skb,
228 const struct macvlan_dev *vlan,
229 const struct ethhdr *eth, bool local)
230 {
231 struct net_device *dev = vlan->dev;
232
233 if (local)
234 return __dev_forward_skb(dev, skb);
235
236 skb->dev = dev;
237 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
238 skb->pkt_type = PACKET_BROADCAST;
239 else
240 skb->pkt_type = PACKET_MULTICAST;
241
242 return 0;
243 }
244
245 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
246 {
247 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
248 }
249
250
251 static unsigned int mc_hash(const struct macvlan_dev *vlan,
252 const unsigned char *addr)
253 {
254 u32 val = __get_unaligned_cpu32(addr + 2);
255
256 val ^= macvlan_hash_mix(vlan);
257 return hash_32(val, MACVLAN_MC_FILTER_BITS);
258 }
259
260 static void macvlan_broadcast(struct sk_buff *skb,
261 const struct macvlan_port *port,
262 struct net_device *src,
263 enum macvlan_mode mode)
264 {
265 const struct ethhdr *eth = eth_hdr(skb);
266 const struct macvlan_dev *vlan;
267 struct sk_buff *nskb;
268 unsigned int i;
269 int err;
270 unsigned int hash;
271
272 if (skb->protocol == htons(ETH_P_PAUSE))
273 return;
274
275 hash_for_each_rcu(port->vlan_hash, i, vlan, hlist) {
276 if (vlan->dev == src || !(vlan->mode & mode))
277 continue;
278
279 hash = mc_hash(vlan, eth->h_dest);
280 if (!test_bit(hash, vlan->mc_filter))
281 continue;
282
283 err = NET_RX_DROP;
284 nskb = skb_clone(skb, GFP_ATOMIC);
285 if (likely(nskb))
286 err = macvlan_broadcast_one(nskb, vlan, eth,
287 mode == MACVLAN_MODE_BRIDGE) ?:
288 netif_rx_ni(nskb);
289 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
290 err == NET_RX_SUCCESS, true);
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) < port->bc_queue_len_used) {
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 struct macvlan_source_entry *entry;
381 struct hlist_node *next;
382 int i;
383
384 hash_for_each_safe(port->vlan_source_hash, i, next, entry, hlist)
385 if (entry->vlan == vlan)
386 macvlan_hash_del_source(entry);
387
388 vlan->macaddr_count = 0;
389 }
390
391 static void macvlan_forward_source_one(struct sk_buff *skb,
392 struct macvlan_dev *vlan)
393 {
394 struct sk_buff *nskb;
395 struct net_device *dev;
396 int len;
397 int ret;
398
399 dev = vlan->dev;
400 if (unlikely(!(dev->flags & IFF_UP)))
401 return;
402
403 nskb = skb_clone(skb, GFP_ATOMIC);
404 if (!nskb)
405 return;
406
407 len = nskb->len + ETH_HLEN;
408 nskb->dev = dev;
409
410 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
411 nskb->pkt_type = PACKET_HOST;
412
413 ret = netif_rx(nskb);
414 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
415 }
416
417 static bool macvlan_forward_source(struct sk_buff *skb,
418 struct macvlan_port *port,
419 const unsigned char *addr)
420 {
421 struct macvlan_source_entry *entry;
422 u32 idx = macvlan_eth_hash(addr);
423 struct hlist_head *h = &port->vlan_source_hash[idx];
424 bool consume = false;
425
426 hlist_for_each_entry_rcu(entry, h, hlist) {
427 if (ether_addr_equal_64bits(entry->addr, addr)) {
428 if (entry->vlan->flags & MACVLAN_FLAG_NODST)
429 consume = true;
430 macvlan_forward_source_one(skb, entry->vlan);
431 }
432 }
433
434 return consume;
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 /* Packets from dev_loopback_xmit() do not have L2 header, bail out */
451 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
452 return RX_HANDLER_PASS;
453
454 port = macvlan_port_get_rcu(skb->dev);
455 if (is_multicast_ether_addr(eth->h_dest)) {
456 unsigned int hash;
457
458 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
459 if (!skb)
460 return RX_HANDLER_CONSUMED;
461 *pskb = skb;
462 eth = eth_hdr(skb);
463 if (macvlan_forward_source(skb, port, eth->h_source))
464 return RX_HANDLER_CONSUMED;
465 src = macvlan_hash_lookup(port, eth->h_source);
466 if (src && src->mode != MACVLAN_MODE_VEPA &&
467 src->mode != MACVLAN_MODE_BRIDGE) {
468 /* forward to original port. */
469 vlan = src;
470 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
471 netif_rx(skb);
472 handle_res = RX_HANDLER_CONSUMED;
473 goto out;
474 }
475
476 hash = mc_hash(NULL, eth->h_dest);
477 if (test_bit(hash, port->mc_filter))
478 macvlan_broadcast_enqueue(port, src, skb);
479
480 return RX_HANDLER_PASS;
481 }
482
483 if (macvlan_forward_source(skb, port, eth->h_source))
484 return RX_HANDLER_CONSUMED;
485 if (macvlan_passthru(port))
486 vlan = list_first_or_null_rcu(&port->vlans,
487 struct macvlan_dev, list);
488 else
489 vlan = macvlan_hash_lookup(port, eth->h_dest);
490 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
491 return RX_HANDLER_PASS;
492
493 dev = vlan->dev;
494 if (unlikely(!(dev->flags & IFF_UP))) {
495 kfree_skb(skb);
496 return RX_HANDLER_CONSUMED;
497 }
498 len = skb->len + ETH_HLEN;
499 skb = skb_share_check(skb, GFP_ATOMIC);
500 if (!skb) {
501 ret = NET_RX_DROP;
502 handle_res = RX_HANDLER_CONSUMED;
503 goto out;
504 }
505
506 *pskb = skb;
507 skb->dev = dev;
508 skb->pkt_type = PACKET_HOST;
509
510 ret = NET_RX_SUCCESS;
511 handle_res = RX_HANDLER_ANOTHER;
512 out:
513 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
514 return handle_res;
515 }
516
517 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
518 {
519 const struct macvlan_dev *vlan = netdev_priv(dev);
520 const struct macvlan_port *port = vlan->port;
521 const struct macvlan_dev *dest;
522
523 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
524 const struct ethhdr *eth = skb_eth_hdr(skb);
525
526 /* send to other bridge ports directly */
527 if (is_multicast_ether_addr(eth->h_dest)) {
528 skb_reset_mac_header(skb);
529 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
530 goto xmit_world;
531 }
532
533 dest = macvlan_hash_lookup(port, eth->h_dest);
534 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
535 /* send to lowerdev first for its network taps */
536 dev_forward_skb(vlan->lowerdev, skb);
537
538 return NET_XMIT_SUCCESS;
539 }
540 }
541 xmit_world:
542 skb->dev = vlan->lowerdev;
543 return dev_queue_xmit_accel(skb,
544 netdev_get_sb_channel(dev) ? dev : NULL);
545 }
546
547 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
548 {
549 #ifdef CONFIG_NET_POLL_CONTROLLER
550 return netpoll_send_skb(vlan->netpoll, skb);
551 #else
552 BUG();
553 return NETDEV_TX_OK;
554 #endif
555 }
556
557 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
558 struct net_device *dev)
559 {
560 struct macvlan_dev *vlan = netdev_priv(dev);
561 unsigned int len = skb->len;
562 int ret;
563
564 if (unlikely(netpoll_tx_running(dev)))
565 return macvlan_netpoll_send_skb(vlan, skb);
566
567 ret = macvlan_queue_xmit(skb, dev);
568
569 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
570 struct vlan_pcpu_stats *pcpu_stats;
571
572 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
573 u64_stats_update_begin(&pcpu_stats->syncp);
574 pcpu_stats->tx_packets++;
575 pcpu_stats->tx_bytes += len;
576 u64_stats_update_end(&pcpu_stats->syncp);
577 } else {
578 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
579 }
580 return ret;
581 }
582
583 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
584 unsigned short type, const void *daddr,
585 const void *saddr, unsigned len)
586 {
587 const struct macvlan_dev *vlan = netdev_priv(dev);
588 struct net_device *lowerdev = vlan->lowerdev;
589
590 return dev_hard_header(skb, lowerdev, type, daddr,
591 saddr ? : dev->dev_addr, len);
592 }
593
594 static const struct header_ops macvlan_hard_header_ops = {
595 .create = macvlan_hard_header,
596 .parse = eth_header_parse,
597 .cache = eth_header_cache,
598 .cache_update = eth_header_cache_update,
599 };
600
601 static int macvlan_open(struct net_device *dev)
602 {
603 struct macvlan_dev *vlan = netdev_priv(dev);
604 struct net_device *lowerdev = vlan->lowerdev;
605 int err;
606
607 if (macvlan_passthru(vlan->port)) {
608 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
609 err = dev_set_promiscuity(lowerdev, 1);
610 if (err < 0)
611 goto out;
612 }
613 goto hash_add;
614 }
615
616 err = -EADDRINUSE;
617 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
618 goto out;
619
620 /* Attempt to populate accel_priv which is used to offload the L2
621 * forwarding requests for unicast packets.
622 */
623 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
624 vlan->accel_priv =
625 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
626
627 /* If earlier attempt to offload failed, or accel_priv is not
628 * populated we must add the unicast address to the lower device.
629 */
630 if (IS_ERR_OR_NULL(vlan->accel_priv)) {
631 vlan->accel_priv = NULL;
632 err = dev_uc_add(lowerdev, dev->dev_addr);
633 if (err < 0)
634 goto out;
635 }
636
637 if (dev->flags & IFF_ALLMULTI) {
638 err = dev_set_allmulti(lowerdev, 1);
639 if (err < 0)
640 goto del_unicast;
641 }
642
643 if (dev->flags & IFF_PROMISC) {
644 err = dev_set_promiscuity(lowerdev, 1);
645 if (err < 0)
646 goto clear_multi;
647 }
648
649 hash_add:
650 macvlan_hash_add(vlan);
651 return 0;
652
653 clear_multi:
654 if (dev->flags & IFF_ALLMULTI)
655 dev_set_allmulti(lowerdev, -1);
656 del_unicast:
657 if (vlan->accel_priv) {
658 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
659 vlan->accel_priv);
660 vlan->accel_priv = NULL;
661 } else {
662 dev_uc_del(lowerdev, dev->dev_addr);
663 }
664 out:
665 return err;
666 }
667
668 static int macvlan_stop(struct net_device *dev)
669 {
670 struct macvlan_dev *vlan = netdev_priv(dev);
671 struct net_device *lowerdev = vlan->lowerdev;
672
673 if (vlan->accel_priv) {
674 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
675 vlan->accel_priv);
676 vlan->accel_priv = NULL;
677 }
678
679 dev_uc_unsync(lowerdev, dev);
680 dev_mc_unsync(lowerdev, dev);
681
682 if (macvlan_passthru(vlan->port)) {
683 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
684 dev_set_promiscuity(lowerdev, -1);
685 goto hash_del;
686 }
687
688 if (dev->flags & IFF_ALLMULTI)
689 dev_set_allmulti(lowerdev, -1);
690
691 if (dev->flags & IFF_PROMISC)
692 dev_set_promiscuity(lowerdev, -1);
693
694 dev_uc_del(lowerdev, dev->dev_addr);
695
696 hash_del:
697 macvlan_hash_del(vlan, !dev->dismantle);
698 return 0;
699 }
700
701 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
702 {
703 struct macvlan_dev *vlan = netdev_priv(dev);
704 struct net_device *lowerdev = vlan->lowerdev;
705 struct macvlan_port *port = vlan->port;
706 int err;
707
708 if (!(dev->flags & IFF_UP)) {
709 /* Just copy in the new address */
710 ether_addr_copy(dev->dev_addr, addr);
711 } else {
712 /* Rehash and update the device filters */
713 if (macvlan_addr_busy(vlan->port, addr))
714 return -EADDRINUSE;
715
716 if (!macvlan_passthru(port)) {
717 err = dev_uc_add(lowerdev, addr);
718 if (err)
719 return err;
720
721 dev_uc_del(lowerdev, dev->dev_addr);
722 }
723
724 macvlan_hash_change_addr(vlan, addr);
725 }
726 if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
727 /* Since addr_change isn't set, we are here due to lower
728 * device change. Save the lower-dev address so we can
729 * restore it later.
730 */
731 ether_addr_copy(vlan->port->perm_addr,
732 lowerdev->dev_addr);
733 }
734 macvlan_clear_addr_change(port);
735 return 0;
736 }
737
738 static int macvlan_set_mac_address(struct net_device *dev, void *p)
739 {
740 struct macvlan_dev *vlan = netdev_priv(dev);
741 struct sockaddr *addr = p;
742
743 if (!is_valid_ether_addr(addr->sa_data))
744 return -EADDRNOTAVAIL;
745
746 /* If the addresses are the same, this is a no-op */
747 if (ether_addr_equal(dev->dev_addr, addr->sa_data))
748 return 0;
749
750 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
751 macvlan_set_addr_change(vlan->port);
752 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
753 }
754
755 if (macvlan_addr_busy(vlan->port, addr->sa_data))
756 return -EADDRINUSE;
757
758 return macvlan_sync_address(dev, addr->sa_data);
759 }
760
761 static void macvlan_change_rx_flags(struct net_device *dev, int change)
762 {
763 struct macvlan_dev *vlan = netdev_priv(dev);
764 struct net_device *lowerdev = vlan->lowerdev;
765
766 if (dev->flags & IFF_UP) {
767 if (change & IFF_ALLMULTI)
768 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
769 if (change & IFF_PROMISC)
770 dev_set_promiscuity(lowerdev,
771 dev->flags & IFF_PROMISC ? 1 : -1);
772
773 }
774 }
775
776 static void macvlan_compute_filter(unsigned long *mc_filter,
777 struct net_device *dev,
778 struct macvlan_dev *vlan)
779 {
780 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
781 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
782 } else {
783 struct netdev_hw_addr *ha;
784 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
785
786 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
787 netdev_for_each_mc_addr(ha, dev) {
788 __set_bit(mc_hash(vlan, ha->addr), filter);
789 }
790
791 __set_bit(mc_hash(vlan, dev->broadcast), filter);
792
793 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
794 }
795 }
796
797 static void macvlan_set_mac_lists(struct net_device *dev)
798 {
799 struct macvlan_dev *vlan = netdev_priv(dev);
800
801 macvlan_compute_filter(vlan->mc_filter, dev, vlan);
802
803 dev_uc_sync(vlan->lowerdev, dev);
804 dev_mc_sync(vlan->lowerdev, dev);
805
806 /* This is slightly inaccurate as we're including the subscription
807 * list of vlan->lowerdev too.
808 *
809 * Bug alert: This only works if everyone has the same broadcast
810 * address as lowerdev. As soon as someone changes theirs this
811 * will break.
812 *
813 * However, this is already broken as when you change your broadcast
814 * address we don't get called.
815 *
816 * The solution is to maintain a list of broadcast addresses like
817 * we do for uc/mc, if you care.
818 */
819 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
820 }
821
822 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
823 {
824 struct macvlan_dev *vlan = netdev_priv(dev);
825
826 if (vlan->lowerdev->mtu < new_mtu)
827 return -EINVAL;
828 dev->mtu = new_mtu;
829 return 0;
830 }
831
832 static int macvlan_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
833 {
834 struct net_device *real_dev = macvlan_dev_real_dev(dev);
835 const struct net_device_ops *ops = real_dev->netdev_ops;
836 struct ifreq ifrr;
837 int err = -EOPNOTSUPP;
838
839 strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
840 ifrr.ifr_ifru = ifr->ifr_ifru;
841
842 switch (cmd) {
843 case SIOCSHWTSTAMP:
844 if (!net_eq(dev_net(dev), &init_net))
845 break;
846 fallthrough;
847 case SIOCGHWTSTAMP:
848 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
849 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
850 break;
851 }
852
853 if (!err)
854 ifr->ifr_ifru = ifrr.ifr_ifru;
855
856 return err;
857 }
858
859 /*
860 * macvlan network devices have devices nesting below it and are a special
861 * "super class" of normal network devices; split their locks off into a
862 * separate class since they always nest.
863 */
864 static struct lock_class_key macvlan_netdev_addr_lock_key;
865
866 #define ALWAYS_ON_OFFLOADS \
867 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
868 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
869
870 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
871
872 #define MACVLAN_FEATURES \
873 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
874 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
875 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
876 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
877
878 #define MACVLAN_STATE_MASK \
879 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
880
881 static void macvlan_set_lockdep_class(struct net_device *dev)
882 {
883 netdev_lockdep_set_classes(dev);
884 lockdep_set_class(&dev->addr_list_lock,
885 &macvlan_netdev_addr_lock_key);
886 }
887
888 static int macvlan_init(struct net_device *dev)
889 {
890 struct macvlan_dev *vlan = netdev_priv(dev);
891 const struct net_device *lowerdev = vlan->lowerdev;
892 struct macvlan_port *port = vlan->port;
893
894 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
895 (lowerdev->state & MACVLAN_STATE_MASK);
896 dev->features = lowerdev->features & MACVLAN_FEATURES;
897 dev->features |= ALWAYS_ON_FEATURES;
898 dev->hw_features |= NETIF_F_LRO;
899 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
900 dev->vlan_features |= ALWAYS_ON_OFFLOADS;
901 dev->hw_enc_features |= dev->features;
902 dev->gso_max_size = lowerdev->gso_max_size;
903 dev->gso_max_segs = lowerdev->gso_max_segs;
904 dev->hard_header_len = lowerdev->hard_header_len;
905 macvlan_set_lockdep_class(dev);
906
907 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
908 if (!vlan->pcpu_stats)
909 return -ENOMEM;
910
911 port->count += 1;
912
913 return 0;
914 }
915
916 static void macvlan_uninit(struct net_device *dev)
917 {
918 struct macvlan_dev *vlan = netdev_priv(dev);
919 struct macvlan_port *port = vlan->port;
920
921 free_percpu(vlan->pcpu_stats);
922
923 macvlan_flush_sources(port, vlan);
924 port->count -= 1;
925 if (!port->count)
926 macvlan_port_destroy(port->dev);
927 }
928
929 static void macvlan_dev_get_stats64(struct net_device *dev,
930 struct rtnl_link_stats64 *stats)
931 {
932 struct macvlan_dev *vlan = netdev_priv(dev);
933
934 if (vlan->pcpu_stats) {
935 struct vlan_pcpu_stats *p;
936 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
937 u32 rx_errors = 0, tx_dropped = 0;
938 unsigned int start;
939 int i;
940
941 for_each_possible_cpu(i) {
942 p = per_cpu_ptr(vlan->pcpu_stats, i);
943 do {
944 start = u64_stats_fetch_begin_irq(&p->syncp);
945 rx_packets = p->rx_packets;
946 rx_bytes = p->rx_bytes;
947 rx_multicast = p->rx_multicast;
948 tx_packets = p->tx_packets;
949 tx_bytes = p->tx_bytes;
950 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
951
952 stats->rx_packets += rx_packets;
953 stats->rx_bytes += rx_bytes;
954 stats->multicast += rx_multicast;
955 stats->tx_packets += tx_packets;
956 stats->tx_bytes += tx_bytes;
957 /* rx_errors & tx_dropped are u32, updated
958 * without syncp protection.
959 */
960 rx_errors += p->rx_errors;
961 tx_dropped += p->tx_dropped;
962 }
963 stats->rx_errors = rx_errors;
964 stats->rx_dropped = rx_errors;
965 stats->tx_dropped = tx_dropped;
966 }
967 }
968
969 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
970 __be16 proto, u16 vid)
971 {
972 struct macvlan_dev *vlan = netdev_priv(dev);
973 struct net_device *lowerdev = vlan->lowerdev;
974
975 return vlan_vid_add(lowerdev, proto, vid);
976 }
977
978 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
979 __be16 proto, u16 vid)
980 {
981 struct macvlan_dev *vlan = netdev_priv(dev);
982 struct net_device *lowerdev = vlan->lowerdev;
983
984 vlan_vid_del(lowerdev, proto, vid);
985 return 0;
986 }
987
988 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
989 struct net_device *dev,
990 const unsigned char *addr, u16 vid,
991 u16 flags,
992 struct netlink_ext_ack *extack)
993 {
994 struct macvlan_dev *vlan = netdev_priv(dev);
995 int err = -EINVAL;
996
997 /* Support unicast filter only on passthru devices.
998 * Multicast filter should be allowed on all devices.
999 */
1000 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1001 return -EOPNOTSUPP;
1002
1003 if (flags & NLM_F_REPLACE)
1004 return -EOPNOTSUPP;
1005
1006 if (is_unicast_ether_addr(addr))
1007 err = dev_uc_add_excl(dev, addr);
1008 else if (is_multicast_ether_addr(addr))
1009 err = dev_mc_add_excl(dev, addr);
1010
1011 return err;
1012 }
1013
1014 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1015 struct net_device *dev,
1016 const unsigned char *addr, u16 vid)
1017 {
1018 struct macvlan_dev *vlan = netdev_priv(dev);
1019 int err = -EINVAL;
1020
1021 /* Support unicast filter only on passthru devices.
1022 * Multicast filter should be allowed on all devices.
1023 */
1024 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1025 return -EOPNOTSUPP;
1026
1027 if (is_unicast_ether_addr(addr))
1028 err = dev_uc_del(dev, addr);
1029 else if (is_multicast_ether_addr(addr))
1030 err = dev_mc_del(dev, addr);
1031
1032 return err;
1033 }
1034
1035 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1036 struct ethtool_drvinfo *drvinfo)
1037 {
1038 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1039 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1040 }
1041
1042 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1043 struct ethtool_link_ksettings *cmd)
1044 {
1045 const struct macvlan_dev *vlan = netdev_priv(dev);
1046
1047 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1048 }
1049
1050 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1051 struct ethtool_ts_info *info)
1052 {
1053 struct net_device *real_dev = macvlan_dev_real_dev(dev);
1054 const struct ethtool_ops *ops = real_dev->ethtool_ops;
1055 struct phy_device *phydev = real_dev->phydev;
1056
1057 if (phy_has_tsinfo(phydev)) {
1058 return phy_ts_info(phydev, info);
1059 } else if (ops->get_ts_info) {
1060 return ops->get_ts_info(real_dev, info);
1061 } else {
1062 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1063 SOF_TIMESTAMPING_SOFTWARE;
1064 info->phc_index = -1;
1065 }
1066
1067 return 0;
1068 }
1069
1070 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1071 netdev_features_t features)
1072 {
1073 struct macvlan_dev *vlan = netdev_priv(dev);
1074 netdev_features_t lowerdev_features = vlan->lowerdev->features;
1075 netdev_features_t mask;
1076
1077 features |= NETIF_F_ALL_FOR_ALL;
1078 features &= (vlan->set_features | ~MACVLAN_FEATURES);
1079 mask = features;
1080
1081 lowerdev_features &= (features | ~NETIF_F_LRO);
1082 features = netdev_increment_features(lowerdev_features, features, mask);
1083 features |= ALWAYS_ON_FEATURES;
1084 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1085
1086 return features;
1087 }
1088
1089 #ifdef CONFIG_NET_POLL_CONTROLLER
1090 static void macvlan_dev_poll_controller(struct net_device *dev)
1091 {
1092 return;
1093 }
1094
1095 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1096 {
1097 struct macvlan_dev *vlan = netdev_priv(dev);
1098 struct net_device *real_dev = vlan->lowerdev;
1099 struct netpoll *netpoll;
1100 int err;
1101
1102 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1103 err = -ENOMEM;
1104 if (!netpoll)
1105 goto out;
1106
1107 err = __netpoll_setup(netpoll, real_dev);
1108 if (err) {
1109 kfree(netpoll);
1110 goto out;
1111 }
1112
1113 vlan->netpoll = netpoll;
1114
1115 out:
1116 return err;
1117 }
1118
1119 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1120 {
1121 struct macvlan_dev *vlan = netdev_priv(dev);
1122 struct netpoll *netpoll = vlan->netpoll;
1123
1124 if (!netpoll)
1125 return;
1126
1127 vlan->netpoll = NULL;
1128
1129 __netpoll_free(netpoll);
1130 }
1131 #endif /* CONFIG_NET_POLL_CONTROLLER */
1132
1133 static int macvlan_dev_get_iflink(const struct net_device *dev)
1134 {
1135 struct macvlan_dev *vlan = netdev_priv(dev);
1136
1137 return vlan->lowerdev->ifindex;
1138 }
1139
1140 static const struct ethtool_ops macvlan_ethtool_ops = {
1141 .get_link = ethtool_op_get_link,
1142 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1143 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1144 .get_ts_info = macvlan_ethtool_get_ts_info,
1145 };
1146
1147 static const struct net_device_ops macvlan_netdev_ops = {
1148 .ndo_init = macvlan_init,
1149 .ndo_uninit = macvlan_uninit,
1150 .ndo_open = macvlan_open,
1151 .ndo_stop = macvlan_stop,
1152 .ndo_start_xmit = macvlan_start_xmit,
1153 .ndo_change_mtu = macvlan_change_mtu,
1154 .ndo_do_ioctl = macvlan_do_ioctl,
1155 .ndo_fix_features = macvlan_fix_features,
1156 .ndo_change_rx_flags = macvlan_change_rx_flags,
1157 .ndo_set_mac_address = macvlan_set_mac_address,
1158 .ndo_set_rx_mode = macvlan_set_mac_lists,
1159 .ndo_get_stats64 = macvlan_dev_get_stats64,
1160 .ndo_validate_addr = eth_validate_addr,
1161 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1162 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1163 .ndo_fdb_add = macvlan_fdb_add,
1164 .ndo_fdb_del = macvlan_fdb_del,
1165 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1166 #ifdef CONFIG_NET_POLL_CONTROLLER
1167 .ndo_poll_controller = macvlan_dev_poll_controller,
1168 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1169 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1170 #endif
1171 .ndo_get_iflink = macvlan_dev_get_iflink,
1172 .ndo_features_check = passthru_features_check,
1173 .ndo_change_proto_down = dev_change_proto_down_generic,
1174 };
1175
1176 void macvlan_common_setup(struct net_device *dev)
1177 {
1178 ether_setup(dev);
1179
1180 dev->min_mtu = 0;
1181 dev->max_mtu = ETH_MAX_MTU;
1182 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1183 netif_keep_dst(dev);
1184 dev->priv_flags |= IFF_UNICAST_FLT;
1185 dev->netdev_ops = &macvlan_netdev_ops;
1186 dev->needs_free_netdev = true;
1187 dev->header_ops = &macvlan_hard_header_ops;
1188 dev->ethtool_ops = &macvlan_ethtool_ops;
1189 }
1190 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1191
1192 static void macvlan_setup(struct net_device *dev)
1193 {
1194 macvlan_common_setup(dev);
1195 dev->priv_flags |= IFF_NO_QUEUE;
1196 }
1197
1198 static int macvlan_port_create(struct net_device *dev)
1199 {
1200 struct macvlan_port *port;
1201 unsigned int i;
1202 int err;
1203
1204 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1205 return -EINVAL;
1206
1207 if (netdev_is_rx_handler_busy(dev))
1208 return -EBUSY;
1209
1210 port = kzalloc(sizeof(*port), GFP_KERNEL);
1211 if (port == NULL)
1212 return -ENOMEM;
1213
1214 port->dev = dev;
1215 ether_addr_copy(port->perm_addr, dev->dev_addr);
1216 INIT_LIST_HEAD(&port->vlans);
1217 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1218 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1219 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1220 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1221
1222 port->bc_queue_len_used = 0;
1223 skb_queue_head_init(&port->bc_queue);
1224 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1225
1226 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1227 if (err)
1228 kfree(port);
1229 else
1230 dev->priv_flags |= IFF_MACVLAN_PORT;
1231 return err;
1232 }
1233
1234 static void macvlan_port_destroy(struct net_device *dev)
1235 {
1236 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1237 struct sk_buff *skb;
1238
1239 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1240 netdev_rx_handler_unregister(dev);
1241
1242 /* After this point, no packet can schedule bc_work anymore,
1243 * but we need to cancel it and purge left skbs if any.
1244 */
1245 cancel_work_sync(&port->bc_work);
1246
1247 while ((skb = __skb_dequeue(&port->bc_queue))) {
1248 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1249
1250 if (src)
1251 dev_put(src->dev);
1252
1253 kfree_skb(skb);
1254 }
1255
1256 /* If the lower device address has been changed by passthru
1257 * macvlan, put it back.
1258 */
1259 if (macvlan_passthru(port) &&
1260 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1261 struct sockaddr sa;
1262
1263 sa.sa_family = port->dev->type;
1264 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1265 dev_set_mac_address(port->dev, &sa, NULL);
1266 }
1267
1268 kfree(port);
1269 }
1270
1271 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1272 struct netlink_ext_ack *extack)
1273 {
1274 struct nlattr *nla, *head;
1275 int rem, len;
1276
1277 if (tb[IFLA_ADDRESS]) {
1278 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1279 return -EINVAL;
1280 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1281 return -EADDRNOTAVAIL;
1282 }
1283
1284 if (!data)
1285 return 0;
1286
1287 if (data[IFLA_MACVLAN_FLAGS] &&
1288 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC |
1289 MACVLAN_FLAG_NODST))
1290 return -EINVAL;
1291
1292 if (data[IFLA_MACVLAN_MODE]) {
1293 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1294 case MACVLAN_MODE_PRIVATE:
1295 case MACVLAN_MODE_VEPA:
1296 case MACVLAN_MODE_BRIDGE:
1297 case MACVLAN_MODE_PASSTHRU:
1298 case MACVLAN_MODE_SOURCE:
1299 break;
1300 default:
1301 return -EINVAL;
1302 }
1303 }
1304
1305 if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1306 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1307 case MACVLAN_MACADDR_ADD:
1308 case MACVLAN_MACADDR_DEL:
1309 case MACVLAN_MACADDR_FLUSH:
1310 case MACVLAN_MACADDR_SET:
1311 break;
1312 default:
1313 return -EINVAL;
1314 }
1315 }
1316
1317 if (data[IFLA_MACVLAN_MACADDR]) {
1318 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1319 return -EINVAL;
1320
1321 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1322 return -EADDRNOTAVAIL;
1323 }
1324
1325 if (data[IFLA_MACVLAN_MACADDR_DATA]) {
1326 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1327 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1328
1329 nla_for_each_attr(nla, head, len, rem) {
1330 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1331 nla_len(nla) != ETH_ALEN)
1332 return -EINVAL;
1333
1334 if (!is_valid_ether_addr(nla_data(nla)))
1335 return -EADDRNOTAVAIL;
1336 }
1337 }
1338
1339 if (data[IFLA_MACVLAN_MACADDR_COUNT])
1340 return -EINVAL;
1341
1342 return 0;
1343 }
1344
1345 /*
1346 * reconfigure list of remote source mac address
1347 * (only for macvlan devices in source mode)
1348 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1349 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1350 */
1351 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1352 struct nlattr *data[])
1353 {
1354 char *addr = NULL;
1355 int ret, rem, len;
1356 struct nlattr *nla, *head;
1357 struct macvlan_source_entry *entry;
1358
1359 if (data[IFLA_MACVLAN_MACADDR])
1360 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1361
1362 if (mode == MACVLAN_MACADDR_ADD) {
1363 if (!addr)
1364 return -EINVAL;
1365
1366 return macvlan_hash_add_source(vlan, addr);
1367
1368 } else if (mode == MACVLAN_MACADDR_DEL) {
1369 if (!addr)
1370 return -EINVAL;
1371
1372 entry = macvlan_hash_lookup_source(vlan, addr);
1373 if (entry) {
1374 macvlan_hash_del_source(entry);
1375 vlan->macaddr_count--;
1376 }
1377 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1378 macvlan_flush_sources(vlan->port, vlan);
1379 } else if (mode == MACVLAN_MACADDR_SET) {
1380 macvlan_flush_sources(vlan->port, vlan);
1381
1382 if (addr) {
1383 ret = macvlan_hash_add_source(vlan, addr);
1384 if (ret)
1385 return ret;
1386 }
1387
1388 if (!data[IFLA_MACVLAN_MACADDR_DATA])
1389 return 0;
1390
1391 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1392 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1393
1394 nla_for_each_attr(nla, head, len, rem) {
1395 addr = nla_data(nla);
1396 ret = macvlan_hash_add_source(vlan, addr);
1397 if (ret)
1398 return ret;
1399 }
1400 } else {
1401 return -EINVAL;
1402 }
1403
1404 return 0;
1405 }
1406
1407 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1408 struct nlattr *tb[], struct nlattr *data[],
1409 struct netlink_ext_ack *extack)
1410 {
1411 struct macvlan_dev *vlan = netdev_priv(dev);
1412 struct macvlan_port *port;
1413 struct net_device *lowerdev;
1414 int err;
1415 int macmode;
1416 bool create = false;
1417
1418 if (!tb[IFLA_LINK])
1419 return -EINVAL;
1420
1421 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1422 if (lowerdev == NULL)
1423 return -ENODEV;
1424
1425 /* When creating macvlans or macvtaps on top of other macvlans - use
1426 * the real device as the lowerdev.
1427 */
1428 if (netif_is_macvlan(lowerdev))
1429 lowerdev = macvlan_dev_real_dev(lowerdev);
1430
1431 if (!tb[IFLA_MTU])
1432 dev->mtu = lowerdev->mtu;
1433 else if (dev->mtu > lowerdev->mtu)
1434 return -EINVAL;
1435
1436 /* MTU range: 68 - lowerdev->max_mtu */
1437 dev->min_mtu = ETH_MIN_MTU;
1438 dev->max_mtu = lowerdev->max_mtu;
1439
1440 if (!tb[IFLA_ADDRESS])
1441 eth_hw_addr_random(dev);
1442
1443 if (!netif_is_macvlan_port(lowerdev)) {
1444 err = macvlan_port_create(lowerdev);
1445 if (err < 0)
1446 return err;
1447 create = true;
1448 }
1449 port = macvlan_port_get_rtnl(lowerdev);
1450
1451 /* Only 1 macvlan device can be created in passthru mode */
1452 if (macvlan_passthru(port)) {
1453 /* The macvlan port must be not created this time,
1454 * still goto destroy_macvlan_port for readability.
1455 */
1456 err = -EINVAL;
1457 goto destroy_macvlan_port;
1458 }
1459
1460 vlan->lowerdev = lowerdev;
1461 vlan->dev = dev;
1462 vlan->port = port;
1463 vlan->set_features = MACVLAN_FEATURES;
1464
1465 vlan->mode = MACVLAN_MODE_VEPA;
1466 if (data && data[IFLA_MACVLAN_MODE])
1467 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1468
1469 if (data && data[IFLA_MACVLAN_FLAGS])
1470 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1471
1472 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1473 if (port->count) {
1474 err = -EINVAL;
1475 goto destroy_macvlan_port;
1476 }
1477 macvlan_set_passthru(port);
1478 eth_hw_addr_inherit(dev, lowerdev);
1479 }
1480
1481 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1482 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1483 err = -EINVAL;
1484 goto destroy_macvlan_port;
1485 }
1486 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1487 err = macvlan_changelink_sources(vlan, macmode, data);
1488 if (err)
1489 goto destroy_macvlan_port;
1490 }
1491
1492 vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN;
1493 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN])
1494 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1495
1496 err = register_netdevice(dev);
1497 if (err < 0)
1498 goto destroy_macvlan_port;
1499
1500 dev->priv_flags |= IFF_MACVLAN;
1501 err = netdev_upper_dev_link(lowerdev, dev, extack);
1502 if (err)
1503 goto unregister_netdev;
1504
1505 list_add_tail_rcu(&vlan->list, &port->vlans);
1506 update_port_bc_queue_len(vlan->port);
1507 netif_stacked_transfer_operstate(lowerdev, dev);
1508 linkwatch_fire_event(dev);
1509
1510 return 0;
1511
1512 unregister_netdev:
1513 /* macvlan_uninit would free the macvlan port */
1514 unregister_netdevice(dev);
1515 return err;
1516 destroy_macvlan_port:
1517 /* the macvlan port may be freed by macvlan_uninit when fail to register.
1518 * so we destroy the macvlan port only when it's valid.
1519 */
1520 if (create && macvlan_port_get_rtnl(lowerdev))
1521 macvlan_port_destroy(port->dev);
1522 return err;
1523 }
1524 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1525
1526 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1527 struct nlattr *tb[], struct nlattr *data[],
1528 struct netlink_ext_ack *extack)
1529 {
1530 return macvlan_common_newlink(src_net, dev, tb, data, extack);
1531 }
1532
1533 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1534 {
1535 struct macvlan_dev *vlan = netdev_priv(dev);
1536
1537 if (vlan->mode == MACVLAN_MODE_SOURCE)
1538 macvlan_flush_sources(vlan->port, vlan);
1539 list_del_rcu(&vlan->list);
1540 update_port_bc_queue_len(vlan->port);
1541 unregister_netdevice_queue(dev, head);
1542 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1543 }
1544 EXPORT_SYMBOL_GPL(macvlan_dellink);
1545
1546 static int macvlan_changelink(struct net_device *dev,
1547 struct nlattr *tb[], struct nlattr *data[],
1548 struct netlink_ext_ack *extack)
1549 {
1550 struct macvlan_dev *vlan = netdev_priv(dev);
1551 enum macvlan_mode mode;
1552 bool set_mode = false;
1553 enum macvlan_macaddr_mode macmode;
1554 int ret;
1555
1556 /* Validate mode, but don't set yet: setting flags may fail. */
1557 if (data && data[IFLA_MACVLAN_MODE]) {
1558 set_mode = true;
1559 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1560 /* Passthrough mode can't be set or cleared dynamically */
1561 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1562 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1563 return -EINVAL;
1564 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1565 vlan->mode != mode)
1566 macvlan_flush_sources(vlan->port, vlan);
1567 }
1568
1569 if (data && data[IFLA_MACVLAN_FLAGS]) {
1570 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1571 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1572 if (macvlan_passthru(vlan->port) && promisc) {
1573 int err;
1574
1575 if (flags & MACVLAN_FLAG_NOPROMISC)
1576 err = dev_set_promiscuity(vlan->lowerdev, -1);
1577 else
1578 err = dev_set_promiscuity(vlan->lowerdev, 1);
1579 if (err < 0)
1580 return err;
1581 }
1582 vlan->flags = flags;
1583 }
1584
1585 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) {
1586 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1587 update_port_bc_queue_len(vlan->port);
1588 }
1589
1590 if (set_mode)
1591 vlan->mode = mode;
1592 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1593 if (vlan->mode != MACVLAN_MODE_SOURCE)
1594 return -EINVAL;
1595 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1596 ret = macvlan_changelink_sources(vlan, macmode, data);
1597 if (ret)
1598 return ret;
1599 }
1600 return 0;
1601 }
1602
1603 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1604 {
1605 if (vlan->macaddr_count == 0)
1606 return 0;
1607 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1608 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1609 }
1610
1611 static size_t macvlan_get_size(const struct net_device *dev)
1612 {
1613 struct macvlan_dev *vlan = netdev_priv(dev);
1614
1615 return (0
1616 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1617 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1618 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1619 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1620 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */
1621 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */
1622 );
1623 }
1624
1625 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1626 const struct macvlan_dev *vlan,
1627 const int i)
1628 {
1629 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1630 struct macvlan_source_entry *entry;
1631
1632 hlist_for_each_entry_rcu(entry, h, hlist) {
1633 if (entry->vlan != vlan)
1634 continue;
1635 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1636 return 1;
1637 }
1638 return 0;
1639 }
1640
1641 static int macvlan_fill_info(struct sk_buff *skb,
1642 const struct net_device *dev)
1643 {
1644 struct macvlan_dev *vlan = netdev_priv(dev);
1645 struct macvlan_port *port = vlan->port;
1646 int i;
1647 struct nlattr *nest;
1648
1649 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1650 goto nla_put_failure;
1651 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1652 goto nla_put_failure;
1653 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1654 goto nla_put_failure;
1655 if (vlan->macaddr_count > 0) {
1656 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1657 if (nest == NULL)
1658 goto nla_put_failure;
1659
1660 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1661 if (macvlan_fill_info_macaddr(skb, vlan, i))
1662 goto nla_put_failure;
1663 }
1664 nla_nest_end(skb, nest);
1665 }
1666 if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, vlan->bc_queue_len_req))
1667 goto nla_put_failure;
1668 if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, port->bc_queue_len_used))
1669 goto nla_put_failure;
1670 return 0;
1671
1672 nla_put_failure:
1673 return -EMSGSIZE;
1674 }
1675
1676 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1677 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1678 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1679 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1680 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1681 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1682 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1683 [IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 },
1684 [IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT },
1685 };
1686
1687 int macvlan_link_register(struct rtnl_link_ops *ops)
1688 {
1689 /* common fields */
1690 ops->validate = macvlan_validate;
1691 ops->maxtype = IFLA_MACVLAN_MAX;
1692 ops->policy = macvlan_policy;
1693 ops->changelink = macvlan_changelink;
1694 ops->get_size = macvlan_get_size;
1695 ops->fill_info = macvlan_fill_info;
1696
1697 return rtnl_link_register(ops);
1698 };
1699 EXPORT_SYMBOL_GPL(macvlan_link_register);
1700
1701 static struct net *macvlan_get_link_net(const struct net_device *dev)
1702 {
1703 return dev_net(macvlan_dev_real_dev(dev));
1704 }
1705
1706 static struct rtnl_link_ops macvlan_link_ops = {
1707 .kind = "macvlan",
1708 .setup = macvlan_setup,
1709 .newlink = macvlan_newlink,
1710 .dellink = macvlan_dellink,
1711 .get_link_net = macvlan_get_link_net,
1712 .priv_size = sizeof(struct macvlan_dev),
1713 };
1714
1715 static void update_port_bc_queue_len(struct macvlan_port *port)
1716 {
1717 u32 max_bc_queue_len_req = 0;
1718 struct macvlan_dev *vlan;
1719
1720 list_for_each_entry(vlan, &port->vlans, list) {
1721 if (vlan->bc_queue_len_req > max_bc_queue_len_req)
1722 max_bc_queue_len_req = vlan->bc_queue_len_req;
1723 }
1724 port->bc_queue_len_used = max_bc_queue_len_req;
1725 }
1726
1727 static int macvlan_device_event(struct notifier_block *unused,
1728 unsigned long event, void *ptr)
1729 {
1730 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1731 struct macvlan_dev *vlan, *next;
1732 struct macvlan_port *port;
1733 LIST_HEAD(list_kill);
1734
1735 if (!netif_is_macvlan_port(dev))
1736 return NOTIFY_DONE;
1737
1738 port = macvlan_port_get_rtnl(dev);
1739
1740 switch (event) {
1741 case NETDEV_UP:
1742 case NETDEV_DOWN:
1743 case NETDEV_CHANGE:
1744 list_for_each_entry(vlan, &port->vlans, list)
1745 netif_stacked_transfer_operstate(vlan->lowerdev,
1746 vlan->dev);
1747 break;
1748 case NETDEV_FEAT_CHANGE:
1749 list_for_each_entry(vlan, &port->vlans, list) {
1750 vlan->dev->gso_max_size = dev->gso_max_size;
1751 vlan->dev->gso_max_segs = dev->gso_max_segs;
1752 netdev_update_features(vlan->dev);
1753 }
1754 break;
1755 case NETDEV_CHANGEMTU:
1756 list_for_each_entry(vlan, &port->vlans, list) {
1757 if (vlan->dev->mtu <= dev->mtu)
1758 continue;
1759 dev_set_mtu(vlan->dev, dev->mtu);
1760 }
1761 break;
1762 case NETDEV_CHANGEADDR:
1763 if (!macvlan_passthru(port))
1764 return NOTIFY_DONE;
1765
1766 vlan = list_first_entry_or_null(&port->vlans,
1767 struct macvlan_dev,
1768 list);
1769
1770 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
1771 return NOTIFY_BAD;
1772
1773 break;
1774 case NETDEV_UNREGISTER:
1775 /* twiddle thumbs on netns device moves */
1776 if (dev->reg_state != NETREG_UNREGISTERING)
1777 break;
1778
1779 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1780 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1781 unregister_netdevice_many(&list_kill);
1782 break;
1783 case NETDEV_PRE_TYPE_CHANGE:
1784 /* Forbid underlying device to change its type. */
1785 return NOTIFY_BAD;
1786
1787 case NETDEV_NOTIFY_PEERS:
1788 case NETDEV_BONDING_FAILOVER:
1789 case NETDEV_RESEND_IGMP:
1790 /* Propagate to all vlans */
1791 list_for_each_entry(vlan, &port->vlans, list)
1792 call_netdevice_notifiers(event, vlan->dev);
1793 }
1794 return NOTIFY_DONE;
1795 }
1796
1797 static struct notifier_block macvlan_notifier_block __read_mostly = {
1798 .notifier_call = macvlan_device_event,
1799 };
1800
1801 static int __init macvlan_init_module(void)
1802 {
1803 int err;
1804
1805 register_netdevice_notifier(&macvlan_notifier_block);
1806
1807 err = macvlan_link_register(&macvlan_link_ops);
1808 if (err < 0)
1809 goto err1;
1810 return 0;
1811 err1:
1812 unregister_netdevice_notifier(&macvlan_notifier_block);
1813 return err;
1814 }
1815
1816 static void __exit macvlan_cleanup_module(void)
1817 {
1818 rtnl_link_unregister(&macvlan_link_ops);
1819 unregister_netdevice_notifier(&macvlan_notifier_block);
1820 }
1821
1822 module_init(macvlan_init_module);
1823 module_exit(macvlan_cleanup_module);
1824
1825 MODULE_LICENSE("GPL");
1826 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1827 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1828 MODULE_ALIAS_RTNL_LINK("macvlan");
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