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Merge tag 'drm-misc-next-2018-11-07' of git://anongit.freedesktop.org/drm/drm-misc...
[mirror_ubuntu-jammy-kernel.git] / drivers / net / macvlan.c
1 /*
2 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of
7 * the License, or (at your option) any later version.
8 *
9 * The code this is based on carried the following copyright notice:
10 * ---
11 * (C) Copyright 2001-2006
12 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
13 * Re-worked by Ben Greear <greearb@candelatech.com>
14 * ---
15 */
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/errno.h>
21 #include <linux/slab.h>
22 #include <linux/string.h>
23 #include <linux/rculist.h>
24 #include <linux/notifier.h>
25 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h>
27 #include <linux/ethtool.h>
28 #include <linux/if_arp.h>
29 #include <linux/if_vlan.h>
30 #include <linux/if_link.h>
31 #include <linux/if_macvlan.h>
32 #include <linux/hash.h>
33 #include <linux/workqueue.h>
34 #include <net/rtnetlink.h>
35 #include <net/xfrm.h>
36 #include <linux/netpoll.h>
37
38 #define MACVLAN_HASH_BITS 8
39 #define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS)
40 #define MACVLAN_BC_QUEUE_LEN 1000
41
42 #define MACVLAN_F_PASSTHRU 1
43 #define MACVLAN_F_ADDRCHANGE 2
44
45 struct macvlan_port {
46 struct net_device *dev;
47 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
48 struct list_head vlans;
49 struct sk_buff_head bc_queue;
50 struct work_struct bc_work;
51 u32 flags;
52 int count;
53 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
54 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
55 unsigned char perm_addr[ETH_ALEN];
56 };
57
58 struct macvlan_source_entry {
59 struct hlist_node hlist;
60 struct macvlan_dev *vlan;
61 unsigned char addr[6+2] __aligned(sizeof(u16));
62 struct rcu_head rcu;
63 };
64
65 struct macvlan_skb_cb {
66 const struct macvlan_dev *src;
67 };
68
69 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
70
71 static void macvlan_port_destroy(struct net_device *dev);
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 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
123
124 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
125 const unsigned char *addr)
126 {
127 struct macvlan_dev *vlan;
128 u32 idx = macvlan_eth_hash(addr);
129
130 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) {
131 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
132 return vlan;
133 }
134 return NULL;
135 }
136
137 static struct macvlan_source_entry *macvlan_hash_lookup_source(
138 const struct macvlan_dev *vlan,
139 const unsigned char *addr)
140 {
141 struct macvlan_source_entry *entry;
142 u32 idx = macvlan_eth_hash(addr);
143 struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
144
145 hlist_for_each_entry_rcu(entry, h, hlist) {
146 if (ether_addr_equal_64bits(entry->addr, addr) &&
147 entry->vlan == vlan)
148 return entry;
149 }
150 return NULL;
151 }
152
153 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
154 const unsigned char *addr)
155 {
156 struct macvlan_port *port = vlan->port;
157 struct macvlan_source_entry *entry;
158 struct hlist_head *h;
159
160 entry = macvlan_hash_lookup_source(vlan, addr);
161 if (entry)
162 return 0;
163
164 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
165 if (!entry)
166 return -ENOMEM;
167
168 ether_addr_copy(entry->addr, addr);
169 entry->vlan = vlan;
170 h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
171 hlist_add_head_rcu(&entry->hlist, h);
172 vlan->macaddr_count++;
173
174 return 0;
175 }
176
177 static void macvlan_hash_add(struct macvlan_dev *vlan)
178 {
179 struct macvlan_port *port = vlan->port;
180 const unsigned char *addr = vlan->dev->dev_addr;
181 u32 idx = macvlan_eth_hash(addr);
182
183 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
184 }
185
186 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
187 {
188 hlist_del_rcu(&entry->hlist);
189 kfree_rcu(entry, rcu);
190 }
191
192 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
193 {
194 hlist_del_rcu(&vlan->hlist);
195 if (sync)
196 synchronize_rcu();
197 }
198
199 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
200 const unsigned char *addr)
201 {
202 macvlan_hash_del(vlan, true);
203 /* Now that we are unhashed it is safe to change the device
204 * address without confusing packet delivery.
205 */
206 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
207 macvlan_hash_add(vlan);
208 }
209
210 static bool macvlan_addr_busy(const struct macvlan_port *port,
211 const unsigned char *addr)
212 {
213 /* Test to see if the specified address is
214 * currently in use by the underlying device or
215 * another macvlan.
216 */
217 if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
218 ether_addr_equal_64bits(port->dev->dev_addr, addr))
219 return true;
220
221 if (macvlan_hash_lookup(port, addr))
222 return true;
223
224 return false;
225 }
226
227
228 static int macvlan_broadcast_one(struct sk_buff *skb,
229 const struct macvlan_dev *vlan,
230 const struct ethhdr *eth, bool local)
231 {
232 struct net_device *dev = vlan->dev;
233
234 if (local)
235 return __dev_forward_skb(dev, skb);
236
237 skb->dev = dev;
238 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
239 skb->pkt_type = PACKET_BROADCAST;
240 else
241 skb->pkt_type = PACKET_MULTICAST;
242
243 return 0;
244 }
245
246 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
247 {
248 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
249 }
250
251
252 static unsigned int mc_hash(const struct macvlan_dev *vlan,
253 const unsigned char *addr)
254 {
255 u32 val = __get_unaligned_cpu32(addr + 2);
256
257 val ^= macvlan_hash_mix(vlan);
258 return hash_32(val, MACVLAN_MC_FILTER_BITS);
259 }
260
261 static void macvlan_broadcast(struct sk_buff *skb,
262 const struct macvlan_port *port,
263 struct net_device *src,
264 enum macvlan_mode mode)
265 {
266 const struct ethhdr *eth = eth_hdr(skb);
267 const struct macvlan_dev *vlan;
268 struct sk_buff *nskb;
269 unsigned int i;
270 int err;
271 unsigned int hash;
272
273 if (skb->protocol == htons(ETH_P_PAUSE))
274 return;
275
276 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
277 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
278 if (vlan->dev == src || !(vlan->mode & mode))
279 continue;
280
281 hash = mc_hash(vlan, eth->h_dest);
282 if (!test_bit(hash, vlan->mc_filter))
283 continue;
284
285 err = NET_RX_DROP;
286 nskb = skb_clone(skb, GFP_ATOMIC);
287 if (likely(nskb))
288 err = macvlan_broadcast_one(
289 nskb, vlan, eth,
290 mode == MACVLAN_MODE_BRIDGE) ?:
291 netif_rx_ni(nskb);
292 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
293 err == NET_RX_SUCCESS, true);
294 }
295 }
296 }
297
298 static void macvlan_process_broadcast(struct work_struct *w)
299 {
300 struct macvlan_port *port = container_of(w, struct macvlan_port,
301 bc_work);
302 struct sk_buff *skb;
303 struct sk_buff_head list;
304
305 __skb_queue_head_init(&list);
306
307 spin_lock_bh(&port->bc_queue.lock);
308 skb_queue_splice_tail_init(&port->bc_queue, &list);
309 spin_unlock_bh(&port->bc_queue.lock);
310
311 while ((skb = __skb_dequeue(&list))) {
312 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
313
314 rcu_read_lock();
315
316 if (!src)
317 /* frame comes from an external address */
318 macvlan_broadcast(skb, port, NULL,
319 MACVLAN_MODE_PRIVATE |
320 MACVLAN_MODE_VEPA |
321 MACVLAN_MODE_PASSTHRU|
322 MACVLAN_MODE_BRIDGE);
323 else if (src->mode == MACVLAN_MODE_VEPA)
324 /* flood to everyone except source */
325 macvlan_broadcast(skb, port, src->dev,
326 MACVLAN_MODE_VEPA |
327 MACVLAN_MODE_BRIDGE);
328 else
329 /*
330 * flood only to VEPA ports, bridge ports
331 * already saw the frame on the way out.
332 */
333 macvlan_broadcast(skb, port, src->dev,
334 MACVLAN_MODE_VEPA);
335
336 rcu_read_unlock();
337
338 if (src)
339 dev_put(src->dev);
340 kfree_skb(skb);
341 }
342 }
343
344 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
345 const struct macvlan_dev *src,
346 struct sk_buff *skb)
347 {
348 struct sk_buff *nskb;
349 int err = -ENOMEM;
350
351 nskb = skb_clone(skb, GFP_ATOMIC);
352 if (!nskb)
353 goto err;
354
355 MACVLAN_SKB_CB(nskb)->src = src;
356
357 spin_lock(&port->bc_queue.lock);
358 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
359 if (src)
360 dev_hold(src->dev);
361 __skb_queue_tail(&port->bc_queue, nskb);
362 err = 0;
363 }
364 spin_unlock(&port->bc_queue.lock);
365
366 if (err)
367 goto free_nskb;
368
369 schedule_work(&port->bc_work);
370 return;
371
372 free_nskb:
373 kfree_skb(nskb);
374 err:
375 atomic_long_inc(&skb->dev->rx_dropped);
376 }
377
378 static void macvlan_flush_sources(struct macvlan_port *port,
379 struct macvlan_dev *vlan)
380 {
381 int i;
382
383 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
384 struct hlist_node *h, *n;
385
386 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
387 struct macvlan_source_entry *entry;
388
389 entry = hlist_entry(h, struct macvlan_source_entry,
390 hlist);
391 if (entry->vlan == vlan)
392 macvlan_hash_del_source(entry);
393 }
394 }
395 vlan->macaddr_count = 0;
396 }
397
398 static void macvlan_forward_source_one(struct sk_buff *skb,
399 struct macvlan_dev *vlan)
400 {
401 struct sk_buff *nskb;
402 struct net_device *dev;
403 int len;
404 int ret;
405
406 dev = vlan->dev;
407 if (unlikely(!(dev->flags & IFF_UP)))
408 return;
409
410 nskb = skb_clone(skb, GFP_ATOMIC);
411 if (!nskb)
412 return;
413
414 len = nskb->len + ETH_HLEN;
415 nskb->dev = dev;
416
417 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
418 nskb->pkt_type = PACKET_HOST;
419
420 ret = netif_rx(nskb);
421 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
422 }
423
424 static void macvlan_forward_source(struct sk_buff *skb,
425 struct macvlan_port *port,
426 const unsigned char *addr)
427 {
428 struct macvlan_source_entry *entry;
429 u32 idx = macvlan_eth_hash(addr);
430 struct hlist_head *h = &port->vlan_source_hash[idx];
431
432 hlist_for_each_entry_rcu(entry, h, hlist) {
433 if (ether_addr_equal_64bits(entry->addr, addr))
434 macvlan_forward_source_one(skb, entry->vlan);
435 }
436 }
437
438 /* called under rcu_read_lock() from netif_receive_skb */
439 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
440 {
441 struct macvlan_port *port;
442 struct sk_buff *skb = *pskb;
443 const struct ethhdr *eth = eth_hdr(skb);
444 const struct macvlan_dev *vlan;
445 const struct macvlan_dev *src;
446 struct net_device *dev;
447 unsigned int len = 0;
448 int ret;
449 rx_handler_result_t handle_res;
450
451 port = macvlan_port_get_rcu(skb->dev);
452 if (is_multicast_ether_addr(eth->h_dest)) {
453 unsigned int hash;
454
455 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
456 if (!skb)
457 return RX_HANDLER_CONSUMED;
458 *pskb = skb;
459 eth = eth_hdr(skb);
460 macvlan_forward_source(skb, port, eth->h_source);
461 src = macvlan_hash_lookup(port, eth->h_source);
462 if (src && src->mode != MACVLAN_MODE_VEPA &&
463 src->mode != MACVLAN_MODE_BRIDGE) {
464 /* forward to original port. */
465 vlan = src;
466 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
467 netif_rx(skb);
468 handle_res = RX_HANDLER_CONSUMED;
469 goto out;
470 }
471
472 hash = mc_hash(NULL, eth->h_dest);
473 if (test_bit(hash, port->mc_filter))
474 macvlan_broadcast_enqueue(port, src, skb);
475
476 return RX_HANDLER_PASS;
477 }
478
479 macvlan_forward_source(skb, port, eth->h_source);
480 if (macvlan_passthru(port))
481 vlan = list_first_or_null_rcu(&port->vlans,
482 struct macvlan_dev, list);
483 else
484 vlan = macvlan_hash_lookup(port, eth->h_dest);
485 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
486 return RX_HANDLER_PASS;
487
488 dev = vlan->dev;
489 if (unlikely(!(dev->flags & IFF_UP))) {
490 kfree_skb(skb);
491 return RX_HANDLER_CONSUMED;
492 }
493 len = skb->len + ETH_HLEN;
494 skb = skb_share_check(skb, GFP_ATOMIC);
495 if (!skb) {
496 ret = NET_RX_DROP;
497 handle_res = RX_HANDLER_CONSUMED;
498 goto out;
499 }
500
501 *pskb = skb;
502 skb->dev = dev;
503 skb->pkt_type = PACKET_HOST;
504
505 ret = NET_RX_SUCCESS;
506 handle_res = RX_HANDLER_ANOTHER;
507 out:
508 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
509 return handle_res;
510 }
511
512 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
513 {
514 const struct macvlan_dev *vlan = netdev_priv(dev);
515 const struct macvlan_port *port = vlan->port;
516 const struct macvlan_dev *dest;
517
518 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
519 const struct ethhdr *eth = (void *)skb->data;
520
521 /* send to other bridge ports directly */
522 if (is_multicast_ether_addr(eth->h_dest)) {
523 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
524 goto xmit_world;
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 = -EBUSY;
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 -EBUSY;
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);
748 }
749
750 return macvlan_sync_address(dev, addr->sa_data);
751 }
752
753 static void macvlan_change_rx_flags(struct net_device *dev, int change)
754 {
755 struct macvlan_dev *vlan = netdev_priv(dev);
756 struct net_device *lowerdev = vlan->lowerdev;
757
758 if (dev->flags & IFF_UP) {
759 if (change & IFF_ALLMULTI)
760 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
761 if (change & IFF_PROMISC)
762 dev_set_promiscuity(lowerdev,
763 dev->flags & IFF_PROMISC ? 1 : -1);
764
765 }
766 }
767
768 static void macvlan_compute_filter(unsigned long *mc_filter,
769 struct net_device *dev,
770 struct macvlan_dev *vlan)
771 {
772 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
773 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
774 } else {
775 struct netdev_hw_addr *ha;
776 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
777
778 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
779 netdev_for_each_mc_addr(ha, dev) {
780 __set_bit(mc_hash(vlan, ha->addr), filter);
781 }
782
783 __set_bit(mc_hash(vlan, dev->broadcast), filter);
784
785 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
786 }
787 }
788
789 static void macvlan_set_mac_lists(struct net_device *dev)
790 {
791 struct macvlan_dev *vlan = netdev_priv(dev);
792
793 macvlan_compute_filter(vlan->mc_filter, dev, vlan);
794
795 dev_uc_sync(vlan->lowerdev, dev);
796 dev_mc_sync(vlan->lowerdev, dev);
797
798 /* This is slightly inaccurate as we're including the subscription
799 * list of vlan->lowerdev too.
800 *
801 * Bug alert: This only works if everyone has the same broadcast
802 * address as lowerdev. As soon as someone changes theirs this
803 * will break.
804 *
805 * However, this is already broken as when you change your broadcast
806 * address we don't get called.
807 *
808 * The solution is to maintain a list of broadcast addresses like
809 * we do for uc/mc, if you care.
810 */
811 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
812 }
813
814 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
815 {
816 struct macvlan_dev *vlan = netdev_priv(dev);
817
818 if (vlan->lowerdev->mtu < new_mtu)
819 return -EINVAL;
820 dev->mtu = new_mtu;
821 return 0;
822 }
823
824 /*
825 * macvlan network devices have devices nesting below it and are a special
826 * "super class" of normal network devices; split their locks off into a
827 * separate class since they always nest.
828 */
829 static struct lock_class_key macvlan_netdev_addr_lock_key;
830
831 #define ALWAYS_ON_OFFLOADS \
832 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
833 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
834
835 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
836
837 #define MACVLAN_FEATURES \
838 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
839 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
840 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
841 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
842
843 #define MACVLAN_STATE_MASK \
844 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
845
846 static int macvlan_get_nest_level(struct net_device *dev)
847 {
848 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
849 }
850
851 static void macvlan_set_lockdep_class(struct net_device *dev)
852 {
853 netdev_lockdep_set_classes(dev);
854 lockdep_set_class_and_subclass(&dev->addr_list_lock,
855 &macvlan_netdev_addr_lock_key,
856 macvlan_get_nest_level(dev));
857 }
858
859 static int macvlan_init(struct net_device *dev)
860 {
861 struct macvlan_dev *vlan = netdev_priv(dev);
862 const struct net_device *lowerdev = vlan->lowerdev;
863 struct macvlan_port *port = vlan->port;
864
865 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
866 (lowerdev->state & MACVLAN_STATE_MASK);
867 dev->features = lowerdev->features & MACVLAN_FEATURES;
868 dev->features |= ALWAYS_ON_FEATURES;
869 dev->hw_features |= NETIF_F_LRO;
870 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
871 dev->vlan_features |= ALWAYS_ON_OFFLOADS;
872 dev->hw_enc_features |= dev->features;
873 dev->gso_max_size = lowerdev->gso_max_size;
874 dev->gso_max_segs = lowerdev->gso_max_segs;
875 dev->hard_header_len = lowerdev->hard_header_len;
876
877 macvlan_set_lockdep_class(dev);
878
879 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
880 if (!vlan->pcpu_stats)
881 return -ENOMEM;
882
883 port->count += 1;
884
885 return 0;
886 }
887
888 static void macvlan_uninit(struct net_device *dev)
889 {
890 struct macvlan_dev *vlan = netdev_priv(dev);
891 struct macvlan_port *port = vlan->port;
892
893 free_percpu(vlan->pcpu_stats);
894
895 macvlan_flush_sources(port, vlan);
896 port->count -= 1;
897 if (!port->count)
898 macvlan_port_destroy(port->dev);
899 }
900
901 static void macvlan_dev_get_stats64(struct net_device *dev,
902 struct rtnl_link_stats64 *stats)
903 {
904 struct macvlan_dev *vlan = netdev_priv(dev);
905
906 if (vlan->pcpu_stats) {
907 struct vlan_pcpu_stats *p;
908 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
909 u32 rx_errors = 0, tx_dropped = 0;
910 unsigned int start;
911 int i;
912
913 for_each_possible_cpu(i) {
914 p = per_cpu_ptr(vlan->pcpu_stats, i);
915 do {
916 start = u64_stats_fetch_begin_irq(&p->syncp);
917 rx_packets = p->rx_packets;
918 rx_bytes = p->rx_bytes;
919 rx_multicast = p->rx_multicast;
920 tx_packets = p->tx_packets;
921 tx_bytes = p->tx_bytes;
922 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
923
924 stats->rx_packets += rx_packets;
925 stats->rx_bytes += rx_bytes;
926 stats->multicast += rx_multicast;
927 stats->tx_packets += tx_packets;
928 stats->tx_bytes += tx_bytes;
929 /* rx_errors & tx_dropped are u32, updated
930 * without syncp protection.
931 */
932 rx_errors += p->rx_errors;
933 tx_dropped += p->tx_dropped;
934 }
935 stats->rx_errors = rx_errors;
936 stats->rx_dropped = rx_errors;
937 stats->tx_dropped = tx_dropped;
938 }
939 }
940
941 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
942 __be16 proto, u16 vid)
943 {
944 struct macvlan_dev *vlan = netdev_priv(dev);
945 struct net_device *lowerdev = vlan->lowerdev;
946
947 return vlan_vid_add(lowerdev, proto, vid);
948 }
949
950 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
951 __be16 proto, u16 vid)
952 {
953 struct macvlan_dev *vlan = netdev_priv(dev);
954 struct net_device *lowerdev = vlan->lowerdev;
955
956 vlan_vid_del(lowerdev, proto, vid);
957 return 0;
958 }
959
960 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
961 struct net_device *dev,
962 const unsigned char *addr, u16 vid,
963 u16 flags)
964 {
965 struct macvlan_dev *vlan = netdev_priv(dev);
966 int err = -EINVAL;
967
968 /* Support unicast filter only on passthru devices.
969 * Multicast filter should be allowed on all devices.
970 */
971 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
972 return -EOPNOTSUPP;
973
974 if (flags & NLM_F_REPLACE)
975 return -EOPNOTSUPP;
976
977 if (is_unicast_ether_addr(addr))
978 err = dev_uc_add_excl(dev, addr);
979 else if (is_multicast_ether_addr(addr))
980 err = dev_mc_add_excl(dev, addr);
981
982 return err;
983 }
984
985 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
986 struct net_device *dev,
987 const unsigned char *addr, u16 vid)
988 {
989 struct macvlan_dev *vlan = netdev_priv(dev);
990 int err = -EINVAL;
991
992 /* Support unicast filter only on passthru devices.
993 * Multicast filter should be allowed on all devices.
994 */
995 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
996 return -EOPNOTSUPP;
997
998 if (is_unicast_ether_addr(addr))
999 err = dev_uc_del(dev, addr);
1000 else if (is_multicast_ether_addr(addr))
1001 err = dev_mc_del(dev, addr);
1002
1003 return err;
1004 }
1005
1006 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1007 struct ethtool_drvinfo *drvinfo)
1008 {
1009 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1010 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1011 }
1012
1013 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1014 struct ethtool_link_ksettings *cmd)
1015 {
1016 const struct macvlan_dev *vlan = netdev_priv(dev);
1017
1018 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1019 }
1020
1021 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1022 netdev_features_t features)
1023 {
1024 struct macvlan_dev *vlan = netdev_priv(dev);
1025 netdev_features_t lowerdev_features = vlan->lowerdev->features;
1026 netdev_features_t mask;
1027
1028 features |= NETIF_F_ALL_FOR_ALL;
1029 features &= (vlan->set_features | ~MACVLAN_FEATURES);
1030 mask = features;
1031
1032 lowerdev_features &= (features | ~NETIF_F_LRO);
1033 features = netdev_increment_features(lowerdev_features, features, mask);
1034 features |= ALWAYS_ON_FEATURES;
1035 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1036
1037 return features;
1038 }
1039
1040 #ifdef CONFIG_NET_POLL_CONTROLLER
1041 static void macvlan_dev_poll_controller(struct net_device *dev)
1042 {
1043 return;
1044 }
1045
1046 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1047 {
1048 struct macvlan_dev *vlan = netdev_priv(dev);
1049 struct net_device *real_dev = vlan->lowerdev;
1050 struct netpoll *netpoll;
1051 int err = 0;
1052
1053 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1054 err = -ENOMEM;
1055 if (!netpoll)
1056 goto out;
1057
1058 err = __netpoll_setup(netpoll, real_dev);
1059 if (err) {
1060 kfree(netpoll);
1061 goto out;
1062 }
1063
1064 vlan->netpoll = netpoll;
1065
1066 out:
1067 return err;
1068 }
1069
1070 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1071 {
1072 struct macvlan_dev *vlan = netdev_priv(dev);
1073 struct netpoll *netpoll = vlan->netpoll;
1074
1075 if (!netpoll)
1076 return;
1077
1078 vlan->netpoll = NULL;
1079
1080 __netpoll_free(netpoll);
1081 }
1082 #endif /* CONFIG_NET_POLL_CONTROLLER */
1083
1084 static int macvlan_dev_get_iflink(const struct net_device *dev)
1085 {
1086 struct macvlan_dev *vlan = netdev_priv(dev);
1087
1088 return vlan->lowerdev->ifindex;
1089 }
1090
1091 static const struct ethtool_ops macvlan_ethtool_ops = {
1092 .get_link = ethtool_op_get_link,
1093 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1094 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1095 };
1096
1097 static const struct net_device_ops macvlan_netdev_ops = {
1098 .ndo_init = macvlan_init,
1099 .ndo_uninit = macvlan_uninit,
1100 .ndo_open = macvlan_open,
1101 .ndo_stop = macvlan_stop,
1102 .ndo_start_xmit = macvlan_start_xmit,
1103 .ndo_change_mtu = macvlan_change_mtu,
1104 .ndo_fix_features = macvlan_fix_features,
1105 .ndo_change_rx_flags = macvlan_change_rx_flags,
1106 .ndo_set_mac_address = macvlan_set_mac_address,
1107 .ndo_set_rx_mode = macvlan_set_mac_lists,
1108 .ndo_get_stats64 = macvlan_dev_get_stats64,
1109 .ndo_validate_addr = eth_validate_addr,
1110 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1111 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1112 .ndo_fdb_add = macvlan_fdb_add,
1113 .ndo_fdb_del = macvlan_fdb_del,
1114 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1115 .ndo_get_lock_subclass = macvlan_get_nest_level,
1116 #ifdef CONFIG_NET_POLL_CONTROLLER
1117 .ndo_poll_controller = macvlan_dev_poll_controller,
1118 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1119 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1120 #endif
1121 .ndo_get_iflink = macvlan_dev_get_iflink,
1122 .ndo_features_check = passthru_features_check,
1123 };
1124
1125 void macvlan_common_setup(struct net_device *dev)
1126 {
1127 ether_setup(dev);
1128
1129 dev->min_mtu = 0;
1130 dev->max_mtu = ETH_MAX_MTU;
1131 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1132 netif_keep_dst(dev);
1133 dev->priv_flags |= IFF_UNICAST_FLT;
1134 dev->netdev_ops = &macvlan_netdev_ops;
1135 dev->needs_free_netdev = true;
1136 dev->header_ops = &macvlan_hard_header_ops;
1137 dev->ethtool_ops = &macvlan_ethtool_ops;
1138 }
1139 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1140
1141 static void macvlan_setup(struct net_device *dev)
1142 {
1143 macvlan_common_setup(dev);
1144 dev->priv_flags |= IFF_NO_QUEUE;
1145 }
1146
1147 static int macvlan_port_create(struct net_device *dev)
1148 {
1149 struct macvlan_port *port;
1150 unsigned int i;
1151 int err;
1152
1153 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1154 return -EINVAL;
1155
1156 if (netdev_is_rx_handler_busy(dev))
1157 return -EBUSY;
1158
1159 port = kzalloc(sizeof(*port), GFP_KERNEL);
1160 if (port == NULL)
1161 return -ENOMEM;
1162
1163 port->dev = dev;
1164 ether_addr_copy(port->perm_addr, dev->dev_addr);
1165 INIT_LIST_HEAD(&port->vlans);
1166 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1167 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1168 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1169 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1170
1171 skb_queue_head_init(&port->bc_queue);
1172 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1173
1174 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1175 if (err)
1176 kfree(port);
1177 else
1178 dev->priv_flags |= IFF_MACVLAN_PORT;
1179 return err;
1180 }
1181
1182 static void macvlan_port_destroy(struct net_device *dev)
1183 {
1184 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1185 struct sk_buff *skb;
1186
1187 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1188 netdev_rx_handler_unregister(dev);
1189
1190 /* After this point, no packet can schedule bc_work anymore,
1191 * but we need to cancel it and purge left skbs if any.
1192 */
1193 cancel_work_sync(&port->bc_work);
1194
1195 while ((skb = __skb_dequeue(&port->bc_queue))) {
1196 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1197
1198 if (src)
1199 dev_put(src->dev);
1200
1201 kfree_skb(skb);
1202 }
1203
1204 /* If the lower device address has been changed by passthru
1205 * macvlan, put it back.
1206 */
1207 if (macvlan_passthru(port) &&
1208 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1209 struct sockaddr sa;
1210
1211 sa.sa_family = port->dev->type;
1212 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1213 dev_set_mac_address(port->dev, &sa);
1214 }
1215
1216 kfree(port);
1217 }
1218
1219 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1220 struct netlink_ext_ack *extack)
1221 {
1222 if (tb[IFLA_ADDRESS]) {
1223 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1224 return -EINVAL;
1225 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1226 return -EADDRNOTAVAIL;
1227 }
1228
1229 if (!data)
1230 return 0;
1231
1232 if (data[IFLA_MACVLAN_FLAGS] &&
1233 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1234 return -EINVAL;
1235
1236 if (data[IFLA_MACVLAN_MODE]) {
1237 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1238 case MACVLAN_MODE_PRIVATE:
1239 case MACVLAN_MODE_VEPA:
1240 case MACVLAN_MODE_BRIDGE:
1241 case MACVLAN_MODE_PASSTHRU:
1242 case MACVLAN_MODE_SOURCE:
1243 break;
1244 default:
1245 return -EINVAL;
1246 }
1247 }
1248
1249 if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1250 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1251 case MACVLAN_MACADDR_ADD:
1252 case MACVLAN_MACADDR_DEL:
1253 case MACVLAN_MACADDR_FLUSH:
1254 case MACVLAN_MACADDR_SET:
1255 break;
1256 default:
1257 return -EINVAL;
1258 }
1259 }
1260
1261 if (data[IFLA_MACVLAN_MACADDR]) {
1262 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1263 return -EINVAL;
1264
1265 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1266 return -EADDRNOTAVAIL;
1267 }
1268
1269 if (data[IFLA_MACVLAN_MACADDR_COUNT])
1270 return -EINVAL;
1271
1272 return 0;
1273 }
1274
1275 /**
1276 * reconfigure list of remote source mac address
1277 * (only for macvlan devices in source mode)
1278 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1279 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1280 */
1281 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1282 struct nlattr *data[])
1283 {
1284 char *addr = NULL;
1285 int ret, rem, len;
1286 struct nlattr *nla, *head;
1287 struct macvlan_source_entry *entry;
1288
1289 if (data[IFLA_MACVLAN_MACADDR])
1290 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1291
1292 if (mode == MACVLAN_MACADDR_ADD) {
1293 if (!addr)
1294 return -EINVAL;
1295
1296 return macvlan_hash_add_source(vlan, addr);
1297
1298 } else if (mode == MACVLAN_MACADDR_DEL) {
1299 if (!addr)
1300 return -EINVAL;
1301
1302 entry = macvlan_hash_lookup_source(vlan, addr);
1303 if (entry) {
1304 macvlan_hash_del_source(entry);
1305 vlan->macaddr_count--;
1306 }
1307 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1308 macvlan_flush_sources(vlan->port, vlan);
1309 } else if (mode == MACVLAN_MACADDR_SET) {
1310 macvlan_flush_sources(vlan->port, vlan);
1311
1312 if (addr) {
1313 ret = macvlan_hash_add_source(vlan, addr);
1314 if (ret)
1315 return ret;
1316 }
1317
1318 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1319 return 0;
1320
1321 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1322 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1323
1324 nla_for_each_attr(nla, head, len, rem) {
1325 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1326 nla_len(nla) != ETH_ALEN)
1327 continue;
1328
1329 addr = nla_data(nla);
1330 ret = macvlan_hash_add_source(vlan, addr);
1331 if (ret)
1332 return ret;
1333 }
1334 } else {
1335 return -EINVAL;
1336 }
1337
1338 return 0;
1339 }
1340
1341 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1342 struct nlattr *tb[], struct nlattr *data[],
1343 struct netlink_ext_ack *extack)
1344 {
1345 struct macvlan_dev *vlan = netdev_priv(dev);
1346 struct macvlan_port *port;
1347 struct net_device *lowerdev;
1348 int err;
1349 int macmode;
1350 bool create = false;
1351
1352 if (!tb[IFLA_LINK])
1353 return -EINVAL;
1354
1355 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1356 if (lowerdev == NULL)
1357 return -ENODEV;
1358
1359 /* When creating macvlans or macvtaps on top of other macvlans - use
1360 * the real device as the lowerdev.
1361 */
1362 if (netif_is_macvlan(lowerdev))
1363 lowerdev = macvlan_dev_real_dev(lowerdev);
1364
1365 if (!tb[IFLA_MTU])
1366 dev->mtu = lowerdev->mtu;
1367 else if (dev->mtu > lowerdev->mtu)
1368 return -EINVAL;
1369
1370 /* MTU range: 68 - lowerdev->max_mtu */
1371 dev->min_mtu = ETH_MIN_MTU;
1372 dev->max_mtu = lowerdev->max_mtu;
1373
1374 if (!tb[IFLA_ADDRESS])
1375 eth_hw_addr_random(dev);
1376
1377 if (!macvlan_port_exists(lowerdev)) {
1378 err = macvlan_port_create(lowerdev);
1379 if (err < 0)
1380 return err;
1381 create = true;
1382 }
1383 port = macvlan_port_get_rtnl(lowerdev);
1384
1385 /* Only 1 macvlan device can be created in passthru mode */
1386 if (macvlan_passthru(port)) {
1387 /* The macvlan port must be not created this time,
1388 * still goto destroy_macvlan_port for readability.
1389 */
1390 err = -EINVAL;
1391 goto destroy_macvlan_port;
1392 }
1393
1394 vlan->lowerdev = lowerdev;
1395 vlan->dev = dev;
1396 vlan->port = port;
1397 vlan->set_features = MACVLAN_FEATURES;
1398 vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1399
1400 vlan->mode = MACVLAN_MODE_VEPA;
1401 if (data && data[IFLA_MACVLAN_MODE])
1402 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1403
1404 if (data && data[IFLA_MACVLAN_FLAGS])
1405 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1406
1407 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1408 if (port->count) {
1409 err = -EINVAL;
1410 goto destroy_macvlan_port;
1411 }
1412 macvlan_set_passthru(port);
1413 eth_hw_addr_inherit(dev, lowerdev);
1414 }
1415
1416 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1417 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1418 err = -EINVAL;
1419 goto destroy_macvlan_port;
1420 }
1421 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1422 err = macvlan_changelink_sources(vlan, macmode, data);
1423 if (err)
1424 goto destroy_macvlan_port;
1425 }
1426
1427 err = register_netdevice(dev);
1428 if (err < 0)
1429 goto destroy_macvlan_port;
1430
1431 dev->priv_flags |= IFF_MACVLAN;
1432 err = netdev_upper_dev_link(lowerdev, dev, extack);
1433 if (err)
1434 goto unregister_netdev;
1435
1436 list_add_tail_rcu(&vlan->list, &port->vlans);
1437 netif_stacked_transfer_operstate(lowerdev, dev);
1438 linkwatch_fire_event(dev);
1439
1440 return 0;
1441
1442 unregister_netdev:
1443 /* macvlan_uninit would free the macvlan port */
1444 unregister_netdevice(dev);
1445 return err;
1446 destroy_macvlan_port:
1447 /* the macvlan port may be freed by macvlan_uninit when fail to register.
1448 * so we destroy the macvlan port only when it's valid.
1449 */
1450 if (create && macvlan_port_get_rtnl(lowerdev))
1451 macvlan_port_destroy(port->dev);
1452 return err;
1453 }
1454 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1455
1456 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1457 struct nlattr *tb[], struct nlattr *data[],
1458 struct netlink_ext_ack *extack)
1459 {
1460 return macvlan_common_newlink(src_net, dev, tb, data, extack);
1461 }
1462
1463 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1464 {
1465 struct macvlan_dev *vlan = netdev_priv(dev);
1466
1467 if (vlan->mode == MACVLAN_MODE_SOURCE)
1468 macvlan_flush_sources(vlan->port, vlan);
1469 list_del_rcu(&vlan->list);
1470 unregister_netdevice_queue(dev, head);
1471 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1472 }
1473 EXPORT_SYMBOL_GPL(macvlan_dellink);
1474
1475 static int macvlan_changelink(struct net_device *dev,
1476 struct nlattr *tb[], struct nlattr *data[],
1477 struct netlink_ext_ack *extack)
1478 {
1479 struct macvlan_dev *vlan = netdev_priv(dev);
1480 enum macvlan_mode mode;
1481 bool set_mode = false;
1482 enum macvlan_macaddr_mode macmode;
1483 int ret;
1484
1485 /* Validate mode, but don't set yet: setting flags may fail. */
1486 if (data && data[IFLA_MACVLAN_MODE]) {
1487 set_mode = true;
1488 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1489 /* Passthrough mode can't be set or cleared dynamically */
1490 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1491 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1492 return -EINVAL;
1493 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1494 vlan->mode != mode)
1495 macvlan_flush_sources(vlan->port, vlan);
1496 }
1497
1498 if (data && data[IFLA_MACVLAN_FLAGS]) {
1499 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1500 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1501 if (macvlan_passthru(vlan->port) && promisc) {
1502 int err;
1503
1504 if (flags & MACVLAN_FLAG_NOPROMISC)
1505 err = dev_set_promiscuity(vlan->lowerdev, -1);
1506 else
1507 err = dev_set_promiscuity(vlan->lowerdev, 1);
1508 if (err < 0)
1509 return err;
1510 }
1511 vlan->flags = flags;
1512 }
1513 if (set_mode)
1514 vlan->mode = mode;
1515 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1516 if (vlan->mode != MACVLAN_MODE_SOURCE)
1517 return -EINVAL;
1518 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1519 ret = macvlan_changelink_sources(vlan, macmode, data);
1520 if (ret)
1521 return ret;
1522 }
1523 return 0;
1524 }
1525
1526 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1527 {
1528 if (vlan->macaddr_count == 0)
1529 return 0;
1530 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1531 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1532 }
1533
1534 static size_t macvlan_get_size(const struct net_device *dev)
1535 {
1536 struct macvlan_dev *vlan = netdev_priv(dev);
1537
1538 return (0
1539 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1540 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1541 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1542 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1543 );
1544 }
1545
1546 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1547 const struct macvlan_dev *vlan,
1548 const int i)
1549 {
1550 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1551 struct macvlan_source_entry *entry;
1552
1553 hlist_for_each_entry_rcu(entry, h, hlist) {
1554 if (entry->vlan != vlan)
1555 continue;
1556 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1557 return 1;
1558 }
1559 return 0;
1560 }
1561
1562 static int macvlan_fill_info(struct sk_buff *skb,
1563 const struct net_device *dev)
1564 {
1565 struct macvlan_dev *vlan = netdev_priv(dev);
1566 int i;
1567 struct nlattr *nest;
1568
1569 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1570 goto nla_put_failure;
1571 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1572 goto nla_put_failure;
1573 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1574 goto nla_put_failure;
1575 if (vlan->macaddr_count > 0) {
1576 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1577 if (nest == NULL)
1578 goto nla_put_failure;
1579
1580 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1581 if (macvlan_fill_info_macaddr(skb, vlan, i))
1582 goto nla_put_failure;
1583 }
1584 nla_nest_end(skb, nest);
1585 }
1586 return 0;
1587
1588 nla_put_failure:
1589 return -EMSGSIZE;
1590 }
1591
1592 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1593 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1594 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1595 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1596 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1597 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1598 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1599 };
1600
1601 int macvlan_link_register(struct rtnl_link_ops *ops)
1602 {
1603 /* common fields */
1604 ops->validate = macvlan_validate;
1605 ops->maxtype = IFLA_MACVLAN_MAX;
1606 ops->policy = macvlan_policy;
1607 ops->changelink = macvlan_changelink;
1608 ops->get_size = macvlan_get_size;
1609 ops->fill_info = macvlan_fill_info;
1610
1611 return rtnl_link_register(ops);
1612 };
1613 EXPORT_SYMBOL_GPL(macvlan_link_register);
1614
1615 static struct net *macvlan_get_link_net(const struct net_device *dev)
1616 {
1617 return dev_net(macvlan_dev_real_dev(dev));
1618 }
1619
1620 static struct rtnl_link_ops macvlan_link_ops = {
1621 .kind = "macvlan",
1622 .setup = macvlan_setup,
1623 .newlink = macvlan_newlink,
1624 .dellink = macvlan_dellink,
1625 .get_link_net = macvlan_get_link_net,
1626 .priv_size = sizeof(struct macvlan_dev),
1627 };
1628
1629 static int macvlan_device_event(struct notifier_block *unused,
1630 unsigned long event, void *ptr)
1631 {
1632 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1633 struct macvlan_dev *vlan, *next;
1634 struct macvlan_port *port;
1635 LIST_HEAD(list_kill);
1636
1637 if (!macvlan_port_exists(dev))
1638 return NOTIFY_DONE;
1639
1640 port = macvlan_port_get_rtnl(dev);
1641
1642 switch (event) {
1643 case NETDEV_UP:
1644 case NETDEV_DOWN:
1645 case NETDEV_CHANGE:
1646 list_for_each_entry(vlan, &port->vlans, list)
1647 netif_stacked_transfer_operstate(vlan->lowerdev,
1648 vlan->dev);
1649 break;
1650 case NETDEV_FEAT_CHANGE:
1651 list_for_each_entry(vlan, &port->vlans, list) {
1652 vlan->dev->gso_max_size = dev->gso_max_size;
1653 vlan->dev->gso_max_segs = dev->gso_max_segs;
1654 netdev_update_features(vlan->dev);
1655 }
1656 break;
1657 case NETDEV_CHANGEMTU:
1658 list_for_each_entry(vlan, &port->vlans, list) {
1659 if (vlan->dev->mtu <= dev->mtu)
1660 continue;
1661 dev_set_mtu(vlan->dev, dev->mtu);
1662 }
1663 break;
1664 case NETDEV_CHANGEADDR:
1665 if (!macvlan_passthru(port))
1666 return NOTIFY_DONE;
1667
1668 vlan = list_first_entry_or_null(&port->vlans,
1669 struct macvlan_dev,
1670 list);
1671
1672 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1673 return NOTIFY_BAD;
1674
1675 break;
1676 case NETDEV_UNREGISTER:
1677 /* twiddle thumbs on netns device moves */
1678 if (dev->reg_state != NETREG_UNREGISTERING)
1679 break;
1680
1681 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1682 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1683 unregister_netdevice_many(&list_kill);
1684 break;
1685 case NETDEV_PRE_TYPE_CHANGE:
1686 /* Forbid underlaying device to change its type. */
1687 return NOTIFY_BAD;
1688
1689 case NETDEV_NOTIFY_PEERS:
1690 case NETDEV_BONDING_FAILOVER:
1691 case NETDEV_RESEND_IGMP:
1692 /* Propagate to all vlans */
1693 list_for_each_entry(vlan, &port->vlans, list)
1694 call_netdevice_notifiers(event, vlan->dev);
1695 }
1696 return NOTIFY_DONE;
1697 }
1698
1699 static struct notifier_block macvlan_notifier_block __read_mostly = {
1700 .notifier_call = macvlan_device_event,
1701 };
1702
1703 static int __init macvlan_init_module(void)
1704 {
1705 int err;
1706
1707 register_netdevice_notifier(&macvlan_notifier_block);
1708
1709 err = macvlan_link_register(&macvlan_link_ops);
1710 if (err < 0)
1711 goto err1;
1712 return 0;
1713 err1:
1714 unregister_netdevice_notifier(&macvlan_notifier_block);
1715 return err;
1716 }
1717
1718 static void __exit macvlan_cleanup_module(void)
1719 {
1720 rtnl_link_unregister(&macvlan_link_ops);
1721 unregister_netdevice_notifier(&macvlan_notifier_block);
1722 }
1723
1724 module_init(macvlan_init_module);
1725 module_exit(macvlan_cleanup_module);
1726
1727 MODULE_LICENSE("GPL");
1728 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1729 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1730 MODULE_ALIAS_RTNL_LINK("macvlan");
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