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Merge tag 'omap-for-v5.0/fixes-rc7-signed' of git://git.kernel.org/pub/scm/linux...
[mirror_ubuntu-eoan-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 consume_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 = -EADDRINUSE;
612 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
613 goto out;
614
615 /* Attempt to populate accel_priv which is used to offload the L2
616 * forwarding requests for unicast packets.
617 */
618 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
619 vlan->accel_priv =
620 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
621
622 /* If earlier attempt to offload failed, or accel_priv is not
623 * populated we must add the unicast address to the lower device.
624 */
625 if (IS_ERR_OR_NULL(vlan->accel_priv)) {
626 vlan->accel_priv = NULL;
627 err = dev_uc_add(lowerdev, dev->dev_addr);
628 if (err < 0)
629 goto out;
630 }
631
632 if (dev->flags & IFF_ALLMULTI) {
633 err = dev_set_allmulti(lowerdev, 1);
634 if (err < 0)
635 goto del_unicast;
636 }
637
638 if (dev->flags & IFF_PROMISC) {
639 err = dev_set_promiscuity(lowerdev, 1);
640 if (err < 0)
641 goto clear_multi;
642 }
643
644 hash_add:
645 macvlan_hash_add(vlan);
646 return 0;
647
648 clear_multi:
649 if (dev->flags & IFF_ALLMULTI)
650 dev_set_allmulti(lowerdev, -1);
651 del_unicast:
652 if (vlan->accel_priv) {
653 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
654 vlan->accel_priv);
655 vlan->accel_priv = NULL;
656 } else {
657 dev_uc_del(lowerdev, dev->dev_addr);
658 }
659 out:
660 return err;
661 }
662
663 static int macvlan_stop(struct net_device *dev)
664 {
665 struct macvlan_dev *vlan = netdev_priv(dev);
666 struct net_device *lowerdev = vlan->lowerdev;
667
668 if (vlan->accel_priv) {
669 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
670 vlan->accel_priv);
671 vlan->accel_priv = NULL;
672 }
673
674 dev_uc_unsync(lowerdev, dev);
675 dev_mc_unsync(lowerdev, dev);
676
677 if (macvlan_passthru(vlan->port)) {
678 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
679 dev_set_promiscuity(lowerdev, -1);
680 goto hash_del;
681 }
682
683 if (dev->flags & IFF_ALLMULTI)
684 dev_set_allmulti(lowerdev, -1);
685
686 if (dev->flags & IFF_PROMISC)
687 dev_set_promiscuity(lowerdev, -1);
688
689 dev_uc_del(lowerdev, dev->dev_addr);
690
691 hash_del:
692 macvlan_hash_del(vlan, !dev->dismantle);
693 return 0;
694 }
695
696 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
697 {
698 struct macvlan_dev *vlan = netdev_priv(dev);
699 struct net_device *lowerdev = vlan->lowerdev;
700 struct macvlan_port *port = vlan->port;
701 int err;
702
703 if (!(dev->flags & IFF_UP)) {
704 /* Just copy in the new address */
705 ether_addr_copy(dev->dev_addr, addr);
706 } else {
707 /* Rehash and update the device filters */
708 if (macvlan_addr_busy(vlan->port, addr))
709 return -EADDRINUSE;
710
711 if (!macvlan_passthru(port)) {
712 err = dev_uc_add(lowerdev, addr);
713 if (err)
714 return err;
715
716 dev_uc_del(lowerdev, dev->dev_addr);
717 }
718
719 macvlan_hash_change_addr(vlan, addr);
720 }
721 if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
722 /* Since addr_change isn't set, we are here due to lower
723 * device change. Save the lower-dev address so we can
724 * restore it later.
725 */
726 ether_addr_copy(vlan->port->perm_addr,
727 lowerdev->dev_addr);
728 }
729 macvlan_clear_addr_change(port);
730 return 0;
731 }
732
733 static int macvlan_set_mac_address(struct net_device *dev, void *p)
734 {
735 struct macvlan_dev *vlan = netdev_priv(dev);
736 struct sockaddr *addr = p;
737
738 if (!is_valid_ether_addr(addr->sa_data))
739 return -EADDRNOTAVAIL;
740
741 /* If the addresses are the same, this is a no-op */
742 if (ether_addr_equal(dev->dev_addr, addr->sa_data))
743 return 0;
744
745 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
746 macvlan_set_addr_change(vlan->port);
747 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
748 }
749
750 if (macvlan_addr_busy(vlan->port, addr->sa_data))
751 return -EADDRINUSE;
752
753 return macvlan_sync_address(dev, addr->sa_data);
754 }
755
756 static void macvlan_change_rx_flags(struct net_device *dev, int change)
757 {
758 struct macvlan_dev *vlan = netdev_priv(dev);
759 struct net_device *lowerdev = vlan->lowerdev;
760
761 if (dev->flags & IFF_UP) {
762 if (change & IFF_ALLMULTI)
763 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
764 if (change & IFF_PROMISC)
765 dev_set_promiscuity(lowerdev,
766 dev->flags & IFF_PROMISC ? 1 : -1);
767
768 }
769 }
770
771 static void macvlan_compute_filter(unsigned long *mc_filter,
772 struct net_device *dev,
773 struct macvlan_dev *vlan)
774 {
775 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
776 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
777 } else {
778 struct netdev_hw_addr *ha;
779 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
780
781 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
782 netdev_for_each_mc_addr(ha, dev) {
783 __set_bit(mc_hash(vlan, ha->addr), filter);
784 }
785
786 __set_bit(mc_hash(vlan, dev->broadcast), filter);
787
788 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
789 }
790 }
791
792 static void macvlan_set_mac_lists(struct net_device *dev)
793 {
794 struct macvlan_dev *vlan = netdev_priv(dev);
795
796 macvlan_compute_filter(vlan->mc_filter, dev, vlan);
797
798 dev_uc_sync(vlan->lowerdev, dev);
799 dev_mc_sync(vlan->lowerdev, dev);
800
801 /* This is slightly inaccurate as we're including the subscription
802 * list of vlan->lowerdev too.
803 *
804 * Bug alert: This only works if everyone has the same broadcast
805 * address as lowerdev. As soon as someone changes theirs this
806 * will break.
807 *
808 * However, this is already broken as when you change your broadcast
809 * address we don't get called.
810 *
811 * The solution is to maintain a list of broadcast addresses like
812 * we do for uc/mc, if you care.
813 */
814 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
815 }
816
817 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
818 {
819 struct macvlan_dev *vlan = netdev_priv(dev);
820
821 if (vlan->lowerdev->mtu < new_mtu)
822 return -EINVAL;
823 dev->mtu = new_mtu;
824 return 0;
825 }
826
827 /*
828 * macvlan network devices have devices nesting below it and are a special
829 * "super class" of normal network devices; split their locks off into a
830 * separate class since they always nest.
831 */
832 static struct lock_class_key macvlan_netdev_addr_lock_key;
833
834 #define ALWAYS_ON_OFFLOADS \
835 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
836 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
837
838 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
839
840 #define MACVLAN_FEATURES \
841 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
842 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
843 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
844 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
845
846 #define MACVLAN_STATE_MASK \
847 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
848
849 static int macvlan_get_nest_level(struct net_device *dev)
850 {
851 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
852 }
853
854 static void macvlan_set_lockdep_class(struct net_device *dev)
855 {
856 netdev_lockdep_set_classes(dev);
857 lockdep_set_class_and_subclass(&dev->addr_list_lock,
858 &macvlan_netdev_addr_lock_key,
859 macvlan_get_nest_level(dev));
860 }
861
862 static int macvlan_init(struct net_device *dev)
863 {
864 struct macvlan_dev *vlan = netdev_priv(dev);
865 const struct net_device *lowerdev = vlan->lowerdev;
866 struct macvlan_port *port = vlan->port;
867
868 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
869 (lowerdev->state & MACVLAN_STATE_MASK);
870 dev->features = lowerdev->features & MACVLAN_FEATURES;
871 dev->features |= ALWAYS_ON_FEATURES;
872 dev->hw_features |= NETIF_F_LRO;
873 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
874 dev->vlan_features |= ALWAYS_ON_OFFLOADS;
875 dev->hw_enc_features |= dev->features;
876 dev->gso_max_size = lowerdev->gso_max_size;
877 dev->gso_max_segs = lowerdev->gso_max_segs;
878 dev->hard_header_len = lowerdev->hard_header_len;
879
880 macvlan_set_lockdep_class(dev);
881
882 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
883 if (!vlan->pcpu_stats)
884 return -ENOMEM;
885
886 port->count += 1;
887
888 return 0;
889 }
890
891 static void macvlan_uninit(struct net_device *dev)
892 {
893 struct macvlan_dev *vlan = netdev_priv(dev);
894 struct macvlan_port *port = vlan->port;
895
896 free_percpu(vlan->pcpu_stats);
897
898 macvlan_flush_sources(port, vlan);
899 port->count -= 1;
900 if (!port->count)
901 macvlan_port_destroy(port->dev);
902 }
903
904 static void macvlan_dev_get_stats64(struct net_device *dev,
905 struct rtnl_link_stats64 *stats)
906 {
907 struct macvlan_dev *vlan = netdev_priv(dev);
908
909 if (vlan->pcpu_stats) {
910 struct vlan_pcpu_stats *p;
911 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
912 u32 rx_errors = 0, tx_dropped = 0;
913 unsigned int start;
914 int i;
915
916 for_each_possible_cpu(i) {
917 p = per_cpu_ptr(vlan->pcpu_stats, i);
918 do {
919 start = u64_stats_fetch_begin_irq(&p->syncp);
920 rx_packets = p->rx_packets;
921 rx_bytes = p->rx_bytes;
922 rx_multicast = p->rx_multicast;
923 tx_packets = p->tx_packets;
924 tx_bytes = p->tx_bytes;
925 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
926
927 stats->rx_packets += rx_packets;
928 stats->rx_bytes += rx_bytes;
929 stats->multicast += rx_multicast;
930 stats->tx_packets += tx_packets;
931 stats->tx_bytes += tx_bytes;
932 /* rx_errors & tx_dropped are u32, updated
933 * without syncp protection.
934 */
935 rx_errors += p->rx_errors;
936 tx_dropped += p->tx_dropped;
937 }
938 stats->rx_errors = rx_errors;
939 stats->rx_dropped = rx_errors;
940 stats->tx_dropped = tx_dropped;
941 }
942 }
943
944 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
945 __be16 proto, u16 vid)
946 {
947 struct macvlan_dev *vlan = netdev_priv(dev);
948 struct net_device *lowerdev = vlan->lowerdev;
949
950 return vlan_vid_add(lowerdev, proto, vid);
951 }
952
953 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
954 __be16 proto, u16 vid)
955 {
956 struct macvlan_dev *vlan = netdev_priv(dev);
957 struct net_device *lowerdev = vlan->lowerdev;
958
959 vlan_vid_del(lowerdev, proto, vid);
960 return 0;
961 }
962
963 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
964 struct net_device *dev,
965 const unsigned char *addr, u16 vid,
966 u16 flags)
967 {
968 struct macvlan_dev *vlan = netdev_priv(dev);
969 int err = -EINVAL;
970
971 /* Support unicast filter only on passthru devices.
972 * Multicast filter should be allowed on all devices.
973 */
974 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
975 return -EOPNOTSUPP;
976
977 if (flags & NLM_F_REPLACE)
978 return -EOPNOTSUPP;
979
980 if (is_unicast_ether_addr(addr))
981 err = dev_uc_add_excl(dev, addr);
982 else if (is_multicast_ether_addr(addr))
983 err = dev_mc_add_excl(dev, addr);
984
985 return err;
986 }
987
988 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
989 struct net_device *dev,
990 const unsigned char *addr, u16 vid)
991 {
992 struct macvlan_dev *vlan = netdev_priv(dev);
993 int err = -EINVAL;
994
995 /* Support unicast filter only on passthru devices.
996 * Multicast filter should be allowed on all devices.
997 */
998 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
999 return -EOPNOTSUPP;
1000
1001 if (is_unicast_ether_addr(addr))
1002 err = dev_uc_del(dev, addr);
1003 else if (is_multicast_ether_addr(addr))
1004 err = dev_mc_del(dev, addr);
1005
1006 return err;
1007 }
1008
1009 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1010 struct ethtool_drvinfo *drvinfo)
1011 {
1012 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1013 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1014 }
1015
1016 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1017 struct ethtool_link_ksettings *cmd)
1018 {
1019 const struct macvlan_dev *vlan = netdev_priv(dev);
1020
1021 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1022 }
1023
1024 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1025 netdev_features_t features)
1026 {
1027 struct macvlan_dev *vlan = netdev_priv(dev);
1028 netdev_features_t lowerdev_features = vlan->lowerdev->features;
1029 netdev_features_t mask;
1030
1031 features |= NETIF_F_ALL_FOR_ALL;
1032 features &= (vlan->set_features | ~MACVLAN_FEATURES);
1033 mask = features;
1034
1035 lowerdev_features &= (features | ~NETIF_F_LRO);
1036 features = netdev_increment_features(lowerdev_features, features, mask);
1037 features |= ALWAYS_ON_FEATURES;
1038 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1039
1040 return features;
1041 }
1042
1043 #ifdef CONFIG_NET_POLL_CONTROLLER
1044 static void macvlan_dev_poll_controller(struct net_device *dev)
1045 {
1046 return;
1047 }
1048
1049 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1050 {
1051 struct macvlan_dev *vlan = netdev_priv(dev);
1052 struct net_device *real_dev = vlan->lowerdev;
1053 struct netpoll *netpoll;
1054 int err = 0;
1055
1056 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1057 err = -ENOMEM;
1058 if (!netpoll)
1059 goto out;
1060
1061 err = __netpoll_setup(netpoll, real_dev);
1062 if (err) {
1063 kfree(netpoll);
1064 goto out;
1065 }
1066
1067 vlan->netpoll = netpoll;
1068
1069 out:
1070 return err;
1071 }
1072
1073 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1074 {
1075 struct macvlan_dev *vlan = netdev_priv(dev);
1076 struct netpoll *netpoll = vlan->netpoll;
1077
1078 if (!netpoll)
1079 return;
1080
1081 vlan->netpoll = NULL;
1082
1083 __netpoll_free(netpoll);
1084 }
1085 #endif /* CONFIG_NET_POLL_CONTROLLER */
1086
1087 static int macvlan_dev_get_iflink(const struct net_device *dev)
1088 {
1089 struct macvlan_dev *vlan = netdev_priv(dev);
1090
1091 return vlan->lowerdev->ifindex;
1092 }
1093
1094 static const struct ethtool_ops macvlan_ethtool_ops = {
1095 .get_link = ethtool_op_get_link,
1096 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1097 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1098 };
1099
1100 static const struct net_device_ops macvlan_netdev_ops = {
1101 .ndo_init = macvlan_init,
1102 .ndo_uninit = macvlan_uninit,
1103 .ndo_open = macvlan_open,
1104 .ndo_stop = macvlan_stop,
1105 .ndo_start_xmit = macvlan_start_xmit,
1106 .ndo_change_mtu = macvlan_change_mtu,
1107 .ndo_fix_features = macvlan_fix_features,
1108 .ndo_change_rx_flags = macvlan_change_rx_flags,
1109 .ndo_set_mac_address = macvlan_set_mac_address,
1110 .ndo_set_rx_mode = macvlan_set_mac_lists,
1111 .ndo_get_stats64 = macvlan_dev_get_stats64,
1112 .ndo_validate_addr = eth_validate_addr,
1113 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1114 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1115 .ndo_fdb_add = macvlan_fdb_add,
1116 .ndo_fdb_del = macvlan_fdb_del,
1117 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1118 .ndo_get_lock_subclass = macvlan_get_nest_level,
1119 #ifdef CONFIG_NET_POLL_CONTROLLER
1120 .ndo_poll_controller = macvlan_dev_poll_controller,
1121 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1122 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1123 #endif
1124 .ndo_get_iflink = macvlan_dev_get_iflink,
1125 .ndo_features_check = passthru_features_check,
1126 };
1127
1128 void macvlan_common_setup(struct net_device *dev)
1129 {
1130 ether_setup(dev);
1131
1132 dev->min_mtu = 0;
1133 dev->max_mtu = ETH_MAX_MTU;
1134 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1135 netif_keep_dst(dev);
1136 dev->priv_flags |= IFF_UNICAST_FLT;
1137 dev->netdev_ops = &macvlan_netdev_ops;
1138 dev->needs_free_netdev = true;
1139 dev->header_ops = &macvlan_hard_header_ops;
1140 dev->ethtool_ops = &macvlan_ethtool_ops;
1141 }
1142 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1143
1144 static void macvlan_setup(struct net_device *dev)
1145 {
1146 macvlan_common_setup(dev);
1147 dev->priv_flags |= IFF_NO_QUEUE;
1148 }
1149
1150 static int macvlan_port_create(struct net_device *dev)
1151 {
1152 struct macvlan_port *port;
1153 unsigned int i;
1154 int err;
1155
1156 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1157 return -EINVAL;
1158
1159 if (netdev_is_rx_handler_busy(dev))
1160 return -EBUSY;
1161
1162 port = kzalloc(sizeof(*port), GFP_KERNEL);
1163 if (port == NULL)
1164 return -ENOMEM;
1165
1166 port->dev = dev;
1167 ether_addr_copy(port->perm_addr, dev->dev_addr);
1168 INIT_LIST_HEAD(&port->vlans);
1169 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1170 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1171 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1172 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1173
1174 skb_queue_head_init(&port->bc_queue);
1175 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1176
1177 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1178 if (err)
1179 kfree(port);
1180 else
1181 dev->priv_flags |= IFF_MACVLAN_PORT;
1182 return err;
1183 }
1184
1185 static void macvlan_port_destroy(struct net_device *dev)
1186 {
1187 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1188 struct sk_buff *skb;
1189
1190 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1191 netdev_rx_handler_unregister(dev);
1192
1193 /* After this point, no packet can schedule bc_work anymore,
1194 * but we need to cancel it and purge left skbs if any.
1195 */
1196 cancel_work_sync(&port->bc_work);
1197
1198 while ((skb = __skb_dequeue(&port->bc_queue))) {
1199 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1200
1201 if (src)
1202 dev_put(src->dev);
1203
1204 kfree_skb(skb);
1205 }
1206
1207 /* If the lower device address has been changed by passthru
1208 * macvlan, put it back.
1209 */
1210 if (macvlan_passthru(port) &&
1211 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1212 struct sockaddr sa;
1213
1214 sa.sa_family = port->dev->type;
1215 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1216 dev_set_mac_address(port->dev, &sa, NULL);
1217 }
1218
1219 kfree(port);
1220 }
1221
1222 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1223 struct netlink_ext_ack *extack)
1224 {
1225 if (tb[IFLA_ADDRESS]) {
1226 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1227 return -EINVAL;
1228 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1229 return -EADDRNOTAVAIL;
1230 }
1231
1232 if (!data)
1233 return 0;
1234
1235 if (data[IFLA_MACVLAN_FLAGS] &&
1236 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1237 return -EINVAL;
1238
1239 if (data[IFLA_MACVLAN_MODE]) {
1240 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1241 case MACVLAN_MODE_PRIVATE:
1242 case MACVLAN_MODE_VEPA:
1243 case MACVLAN_MODE_BRIDGE:
1244 case MACVLAN_MODE_PASSTHRU:
1245 case MACVLAN_MODE_SOURCE:
1246 break;
1247 default:
1248 return -EINVAL;
1249 }
1250 }
1251
1252 if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1253 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1254 case MACVLAN_MACADDR_ADD:
1255 case MACVLAN_MACADDR_DEL:
1256 case MACVLAN_MACADDR_FLUSH:
1257 case MACVLAN_MACADDR_SET:
1258 break;
1259 default:
1260 return -EINVAL;
1261 }
1262 }
1263
1264 if (data[IFLA_MACVLAN_MACADDR]) {
1265 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1266 return -EINVAL;
1267
1268 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1269 return -EADDRNOTAVAIL;
1270 }
1271
1272 if (data[IFLA_MACVLAN_MACADDR_COUNT])
1273 return -EINVAL;
1274
1275 return 0;
1276 }
1277
1278 /**
1279 * reconfigure list of remote source mac address
1280 * (only for macvlan devices in source mode)
1281 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1282 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1283 */
1284 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1285 struct nlattr *data[])
1286 {
1287 char *addr = NULL;
1288 int ret, rem, len;
1289 struct nlattr *nla, *head;
1290 struct macvlan_source_entry *entry;
1291
1292 if (data[IFLA_MACVLAN_MACADDR])
1293 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1294
1295 if (mode == MACVLAN_MACADDR_ADD) {
1296 if (!addr)
1297 return -EINVAL;
1298
1299 return macvlan_hash_add_source(vlan, addr);
1300
1301 } else if (mode == MACVLAN_MACADDR_DEL) {
1302 if (!addr)
1303 return -EINVAL;
1304
1305 entry = macvlan_hash_lookup_source(vlan, addr);
1306 if (entry) {
1307 macvlan_hash_del_source(entry);
1308 vlan->macaddr_count--;
1309 }
1310 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1311 macvlan_flush_sources(vlan->port, vlan);
1312 } else if (mode == MACVLAN_MACADDR_SET) {
1313 macvlan_flush_sources(vlan->port, vlan);
1314
1315 if (addr) {
1316 ret = macvlan_hash_add_source(vlan, addr);
1317 if (ret)
1318 return ret;
1319 }
1320
1321 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1322 return 0;
1323
1324 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1325 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1326
1327 nla_for_each_attr(nla, head, len, rem) {
1328 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1329 nla_len(nla) != ETH_ALEN)
1330 continue;
1331
1332 addr = nla_data(nla);
1333 ret = macvlan_hash_add_source(vlan, addr);
1334 if (ret)
1335 return ret;
1336 }
1337 } else {
1338 return -EINVAL;
1339 }
1340
1341 return 0;
1342 }
1343
1344 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1345 struct nlattr *tb[], struct nlattr *data[],
1346 struct netlink_ext_ack *extack)
1347 {
1348 struct macvlan_dev *vlan = netdev_priv(dev);
1349 struct macvlan_port *port;
1350 struct net_device *lowerdev;
1351 int err;
1352 int macmode;
1353 bool create = false;
1354
1355 if (!tb[IFLA_LINK])
1356 return -EINVAL;
1357
1358 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1359 if (lowerdev == NULL)
1360 return -ENODEV;
1361
1362 /* When creating macvlans or macvtaps on top of other macvlans - use
1363 * the real device as the lowerdev.
1364 */
1365 if (netif_is_macvlan(lowerdev))
1366 lowerdev = macvlan_dev_real_dev(lowerdev);
1367
1368 if (!tb[IFLA_MTU])
1369 dev->mtu = lowerdev->mtu;
1370 else if (dev->mtu > lowerdev->mtu)
1371 return -EINVAL;
1372
1373 /* MTU range: 68 - lowerdev->max_mtu */
1374 dev->min_mtu = ETH_MIN_MTU;
1375 dev->max_mtu = lowerdev->max_mtu;
1376
1377 if (!tb[IFLA_ADDRESS])
1378 eth_hw_addr_random(dev);
1379
1380 if (!macvlan_port_exists(lowerdev)) {
1381 err = macvlan_port_create(lowerdev);
1382 if (err < 0)
1383 return err;
1384 create = true;
1385 }
1386 port = macvlan_port_get_rtnl(lowerdev);
1387
1388 /* Only 1 macvlan device can be created in passthru mode */
1389 if (macvlan_passthru(port)) {
1390 /* The macvlan port must be not created this time,
1391 * still goto destroy_macvlan_port for readability.
1392 */
1393 err = -EINVAL;
1394 goto destroy_macvlan_port;
1395 }
1396
1397 vlan->lowerdev = lowerdev;
1398 vlan->dev = dev;
1399 vlan->port = port;
1400 vlan->set_features = MACVLAN_FEATURES;
1401 vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1402
1403 vlan->mode = MACVLAN_MODE_VEPA;
1404 if (data && data[IFLA_MACVLAN_MODE])
1405 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1406
1407 if (data && data[IFLA_MACVLAN_FLAGS])
1408 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1409
1410 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1411 if (port->count) {
1412 err = -EINVAL;
1413 goto destroy_macvlan_port;
1414 }
1415 macvlan_set_passthru(port);
1416 eth_hw_addr_inherit(dev, lowerdev);
1417 }
1418
1419 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1420 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1421 err = -EINVAL;
1422 goto destroy_macvlan_port;
1423 }
1424 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1425 err = macvlan_changelink_sources(vlan, macmode, data);
1426 if (err)
1427 goto destroy_macvlan_port;
1428 }
1429
1430 err = register_netdevice(dev);
1431 if (err < 0)
1432 goto destroy_macvlan_port;
1433
1434 dev->priv_flags |= IFF_MACVLAN;
1435 err = netdev_upper_dev_link(lowerdev, dev, extack);
1436 if (err)
1437 goto unregister_netdev;
1438
1439 list_add_tail_rcu(&vlan->list, &port->vlans);
1440 netif_stacked_transfer_operstate(lowerdev, dev);
1441 linkwatch_fire_event(dev);
1442
1443 return 0;
1444
1445 unregister_netdev:
1446 /* macvlan_uninit would free the macvlan port */
1447 unregister_netdevice(dev);
1448 return err;
1449 destroy_macvlan_port:
1450 /* the macvlan port may be freed by macvlan_uninit when fail to register.
1451 * so we destroy the macvlan port only when it's valid.
1452 */
1453 if (create && macvlan_port_get_rtnl(lowerdev))
1454 macvlan_port_destroy(port->dev);
1455 return err;
1456 }
1457 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1458
1459 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1460 struct nlattr *tb[], struct nlattr *data[],
1461 struct netlink_ext_ack *extack)
1462 {
1463 return macvlan_common_newlink(src_net, dev, tb, data, extack);
1464 }
1465
1466 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1467 {
1468 struct macvlan_dev *vlan = netdev_priv(dev);
1469
1470 if (vlan->mode == MACVLAN_MODE_SOURCE)
1471 macvlan_flush_sources(vlan->port, vlan);
1472 list_del_rcu(&vlan->list);
1473 unregister_netdevice_queue(dev, head);
1474 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1475 }
1476 EXPORT_SYMBOL_GPL(macvlan_dellink);
1477
1478 static int macvlan_changelink(struct net_device *dev,
1479 struct nlattr *tb[], struct nlattr *data[],
1480 struct netlink_ext_ack *extack)
1481 {
1482 struct macvlan_dev *vlan = netdev_priv(dev);
1483 enum macvlan_mode mode;
1484 bool set_mode = false;
1485 enum macvlan_macaddr_mode macmode;
1486 int ret;
1487
1488 /* Validate mode, but don't set yet: setting flags may fail. */
1489 if (data && data[IFLA_MACVLAN_MODE]) {
1490 set_mode = true;
1491 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1492 /* Passthrough mode can't be set or cleared dynamically */
1493 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1494 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1495 return -EINVAL;
1496 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1497 vlan->mode != mode)
1498 macvlan_flush_sources(vlan->port, vlan);
1499 }
1500
1501 if (data && data[IFLA_MACVLAN_FLAGS]) {
1502 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1503 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1504 if (macvlan_passthru(vlan->port) && promisc) {
1505 int err;
1506
1507 if (flags & MACVLAN_FLAG_NOPROMISC)
1508 err = dev_set_promiscuity(vlan->lowerdev, -1);
1509 else
1510 err = dev_set_promiscuity(vlan->lowerdev, 1);
1511 if (err < 0)
1512 return err;
1513 }
1514 vlan->flags = flags;
1515 }
1516 if (set_mode)
1517 vlan->mode = mode;
1518 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1519 if (vlan->mode != MACVLAN_MODE_SOURCE)
1520 return -EINVAL;
1521 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1522 ret = macvlan_changelink_sources(vlan, macmode, data);
1523 if (ret)
1524 return ret;
1525 }
1526 return 0;
1527 }
1528
1529 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1530 {
1531 if (vlan->macaddr_count == 0)
1532 return 0;
1533 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1534 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1535 }
1536
1537 static size_t macvlan_get_size(const struct net_device *dev)
1538 {
1539 struct macvlan_dev *vlan = netdev_priv(dev);
1540
1541 return (0
1542 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1543 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1544 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1545 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1546 );
1547 }
1548
1549 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1550 const struct macvlan_dev *vlan,
1551 const int i)
1552 {
1553 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1554 struct macvlan_source_entry *entry;
1555
1556 hlist_for_each_entry_rcu(entry, h, hlist) {
1557 if (entry->vlan != vlan)
1558 continue;
1559 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1560 return 1;
1561 }
1562 return 0;
1563 }
1564
1565 static int macvlan_fill_info(struct sk_buff *skb,
1566 const struct net_device *dev)
1567 {
1568 struct macvlan_dev *vlan = netdev_priv(dev);
1569 int i;
1570 struct nlattr *nest;
1571
1572 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1573 goto nla_put_failure;
1574 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1575 goto nla_put_failure;
1576 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1577 goto nla_put_failure;
1578 if (vlan->macaddr_count > 0) {
1579 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1580 if (nest == NULL)
1581 goto nla_put_failure;
1582
1583 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1584 if (macvlan_fill_info_macaddr(skb, vlan, i))
1585 goto nla_put_failure;
1586 }
1587 nla_nest_end(skb, nest);
1588 }
1589 return 0;
1590
1591 nla_put_failure:
1592 return -EMSGSIZE;
1593 }
1594
1595 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1596 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1597 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1598 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1599 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1600 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1601 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1602 };
1603
1604 int macvlan_link_register(struct rtnl_link_ops *ops)
1605 {
1606 /* common fields */
1607 ops->validate = macvlan_validate;
1608 ops->maxtype = IFLA_MACVLAN_MAX;
1609 ops->policy = macvlan_policy;
1610 ops->changelink = macvlan_changelink;
1611 ops->get_size = macvlan_get_size;
1612 ops->fill_info = macvlan_fill_info;
1613
1614 return rtnl_link_register(ops);
1615 };
1616 EXPORT_SYMBOL_GPL(macvlan_link_register);
1617
1618 static struct net *macvlan_get_link_net(const struct net_device *dev)
1619 {
1620 return dev_net(macvlan_dev_real_dev(dev));
1621 }
1622
1623 static struct rtnl_link_ops macvlan_link_ops = {
1624 .kind = "macvlan",
1625 .setup = macvlan_setup,
1626 .newlink = macvlan_newlink,
1627 .dellink = macvlan_dellink,
1628 .get_link_net = macvlan_get_link_net,
1629 .priv_size = sizeof(struct macvlan_dev),
1630 };
1631
1632 static int macvlan_device_event(struct notifier_block *unused,
1633 unsigned long event, void *ptr)
1634 {
1635 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1636 struct macvlan_dev *vlan, *next;
1637 struct macvlan_port *port;
1638 LIST_HEAD(list_kill);
1639
1640 if (!macvlan_port_exists(dev))
1641 return NOTIFY_DONE;
1642
1643 port = macvlan_port_get_rtnl(dev);
1644
1645 switch (event) {
1646 case NETDEV_UP:
1647 case NETDEV_DOWN:
1648 case NETDEV_CHANGE:
1649 list_for_each_entry(vlan, &port->vlans, list)
1650 netif_stacked_transfer_operstate(vlan->lowerdev,
1651 vlan->dev);
1652 break;
1653 case NETDEV_FEAT_CHANGE:
1654 list_for_each_entry(vlan, &port->vlans, list) {
1655 vlan->dev->gso_max_size = dev->gso_max_size;
1656 vlan->dev->gso_max_segs = dev->gso_max_segs;
1657 netdev_update_features(vlan->dev);
1658 }
1659 break;
1660 case NETDEV_CHANGEMTU:
1661 list_for_each_entry(vlan, &port->vlans, list) {
1662 if (vlan->dev->mtu <= dev->mtu)
1663 continue;
1664 dev_set_mtu(vlan->dev, dev->mtu);
1665 }
1666 break;
1667 case NETDEV_CHANGEADDR:
1668 if (!macvlan_passthru(port))
1669 return NOTIFY_DONE;
1670
1671 vlan = list_first_entry_or_null(&port->vlans,
1672 struct macvlan_dev,
1673 list);
1674
1675 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1676 return NOTIFY_BAD;
1677
1678 break;
1679 case NETDEV_UNREGISTER:
1680 /* twiddle thumbs on netns device moves */
1681 if (dev->reg_state != NETREG_UNREGISTERING)
1682 break;
1683
1684 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1685 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1686 unregister_netdevice_many(&list_kill);
1687 break;
1688 case NETDEV_PRE_TYPE_CHANGE:
1689 /* Forbid underlaying device to change its type. */
1690 return NOTIFY_BAD;
1691
1692 case NETDEV_NOTIFY_PEERS:
1693 case NETDEV_BONDING_FAILOVER:
1694 case NETDEV_RESEND_IGMP:
1695 /* Propagate to all vlans */
1696 list_for_each_entry(vlan, &port->vlans, list)
1697 call_netdevice_notifiers(event, vlan->dev);
1698 }
1699 return NOTIFY_DONE;
1700 }
1701
1702 static struct notifier_block macvlan_notifier_block __read_mostly = {
1703 .notifier_call = macvlan_device_event,
1704 };
1705
1706 static int __init macvlan_init_module(void)
1707 {
1708 int err;
1709
1710 register_netdevice_notifier(&macvlan_notifier_block);
1711
1712 err = macvlan_link_register(&macvlan_link_ops);
1713 if (err < 0)
1714 goto err1;
1715 return 0;
1716 err1:
1717 unregister_netdevice_notifier(&macvlan_notifier_block);
1718 return err;
1719 }
1720
1721 static void __exit macvlan_cleanup_module(void)
1722 {
1723 rtnl_link_unregister(&macvlan_link_ops);
1724 unregister_netdevice_notifier(&macvlan_notifier_block);
1725 }
1726
1727 module_init(macvlan_init_module);
1728 module_exit(macvlan_cleanup_module);
1729
1730 MODULE_LICENSE("GPL");
1731 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1732 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1733 MODULE_ALIAS_RTNL_LINK("macvlan");
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