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i2c: gpio: fault-injector: refactor incomplete transfer
[linux/fpc-iii.git] / drivers / net / macvlan.c
blobadde8fc45588ba12c82bd79cf830e3ed99b907e3
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 void *accel_priv = NULL;
518
519 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
520 const struct ethhdr *eth = (void *)skb->data;
521
522 /* send to other bridge ports directly */
523 if (is_multicast_ether_addr(eth->h_dest)) {
524 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
525 goto xmit_world;
526 }
527
528 dest = macvlan_hash_lookup(port, eth->h_dest);
529 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
530 /* send to lowerdev first for its network taps */
531 dev_forward_skb(vlan->lowerdev, skb);
532
533 return NET_XMIT_SUCCESS;
534 }
535 }
536
537 /* For packets that are non-multicast and not bridged we will pass
538 * the necessary information so that the lowerdev can distinguish
539 * the source of the packets via the accel_priv value.
540 */
541 accel_priv = vlan->accel_priv;
542 xmit_world:
543 skb->dev = vlan->lowerdev;
544 return dev_queue_xmit_accel(skb, accel_priv);
545 }
546
547 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
548 {
549 #ifdef CONFIG_NET_POLL_CONTROLLER
550 if (vlan->netpoll)
551 netpoll_send_skb(vlan->netpoll, skb);
552 #else
553 BUG();
554 #endif
555 return NETDEV_TX_OK;
556 }
557
558 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
559 struct net_device *dev)
560 {
561 struct macvlan_dev *vlan = netdev_priv(dev);
562 unsigned int len = skb->len;
563 int ret;
564
565 if (unlikely(netpoll_tx_running(dev)))
566 return macvlan_netpoll_send_skb(vlan, skb);
567
568 ret = macvlan_queue_xmit(skb, dev);
569
570 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
571 struct vlan_pcpu_stats *pcpu_stats;
572
573 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
574 u64_stats_update_begin(&pcpu_stats->syncp);
575 pcpu_stats->tx_packets++;
576 pcpu_stats->tx_bytes += len;
577 u64_stats_update_end(&pcpu_stats->syncp);
578 } else {
579 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
580 }
581 return ret;
582 }
583
584 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
585 unsigned short type, const void *daddr,
586 const void *saddr, unsigned len)
587 {
588 const struct macvlan_dev *vlan = netdev_priv(dev);
589 struct net_device *lowerdev = vlan->lowerdev;
590
591 return dev_hard_header(skb, lowerdev, type, daddr,
592 saddr ? : dev->dev_addr, len);
593 }
594
595 static const struct header_ops macvlan_hard_header_ops = {
596 .create = macvlan_hard_header,
597 .parse = eth_header_parse,
598 .cache = eth_header_cache,
599 .cache_update = eth_header_cache_update,
600 };
601
602 static int macvlan_open(struct net_device *dev)
603 {
604 struct macvlan_dev *vlan = netdev_priv(dev);
605 struct net_device *lowerdev = vlan->lowerdev;
606 int err;
607
608 if (macvlan_passthru(vlan->port)) {
609 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
610 err = dev_set_promiscuity(lowerdev, 1);
611 if (err < 0)
612 goto out;
613 }
614 goto hash_add;
615 }
616
617 err = -EBUSY;
618 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
619 goto out;
620
621 /* Attempt to populate accel_priv which is used to offload the L2
622 * forwarding requests for unicast packets.
623 */
624 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
625 vlan->accel_priv =
626 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
627
628 /* If earlier attempt to offload failed, or accel_priv is not
629 * populated we must add the unicast address to the lower device.
630 */
631 if (IS_ERR_OR_NULL(vlan->accel_priv)) {
632 vlan->accel_priv = NULL;
633 err = dev_uc_add(lowerdev, dev->dev_addr);
634 if (err < 0)
635 goto out;
636 }
637
638 if (dev->flags & IFF_ALLMULTI) {
639 err = dev_set_allmulti(lowerdev, 1);
640 if (err < 0)
641 goto del_unicast;
642 }
643
644 if (dev->flags & IFF_PROMISC) {
645 err = dev_set_promiscuity(lowerdev, 1);
646 if (err < 0)
647 goto clear_multi;
648 }
649
650 hash_add:
651 macvlan_hash_add(vlan);
652 return 0;
653
654 clear_multi:
655 if (dev->flags & IFF_ALLMULTI)
656 dev_set_allmulti(lowerdev, -1);
657 del_unicast:
658 if (vlan->accel_priv) {
659 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
660 vlan->accel_priv);
661 vlan->accel_priv = NULL;
662 } else {
663 dev_uc_del(lowerdev, dev->dev_addr);
664 }
665 out:
666 return err;
667 }
668
669 static int macvlan_stop(struct net_device *dev)
670 {
671 struct macvlan_dev *vlan = netdev_priv(dev);
672 struct net_device *lowerdev = vlan->lowerdev;
673
674 if (vlan->accel_priv) {
675 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
676 vlan->accel_priv);
677 vlan->accel_priv = NULL;
678 }
679
680 dev_uc_unsync(lowerdev, dev);
681 dev_mc_unsync(lowerdev, dev);
682
683 if (macvlan_passthru(vlan->port)) {
684 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
685 dev_set_promiscuity(lowerdev, -1);
686 goto hash_del;
687 }
688
689 if (dev->flags & IFF_ALLMULTI)
690 dev_set_allmulti(lowerdev, -1);
691
692 if (dev->flags & IFF_PROMISC)
693 dev_set_promiscuity(lowerdev, -1);
694
695 dev_uc_del(lowerdev, dev->dev_addr);
696
697 hash_del:
698 macvlan_hash_del(vlan, !dev->dismantle);
699 return 0;
700 }
701
702 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
703 {
704 struct macvlan_dev *vlan = netdev_priv(dev);
705 struct net_device *lowerdev = vlan->lowerdev;
706 struct macvlan_port *port = vlan->port;
707 int err;
708
709 if (!(dev->flags & IFF_UP)) {
710 /* Just copy in the new address */
711 ether_addr_copy(dev->dev_addr, addr);
712 } else {
713 /* Rehash and update the device filters */
714 if (macvlan_addr_busy(vlan->port, addr))
715 return -EBUSY;
716
717 if (!macvlan_passthru(port)) {
718 err = dev_uc_add(lowerdev, addr);
719 if (err)
720 return err;
721
722 dev_uc_del(lowerdev, dev->dev_addr);
723 }
724
725 macvlan_hash_change_addr(vlan, addr);
726 }
727 if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
728 /* Since addr_change isn't set, we are here due to lower
729 * device change. Save the lower-dev address so we can
730 * restore it later.
731 */
732 ether_addr_copy(vlan->port->perm_addr,
733 lowerdev->dev_addr);
734 }
735 macvlan_clear_addr_change(port);
736 return 0;
737 }
738
739 static int macvlan_set_mac_address(struct net_device *dev, void *p)
740 {
741 struct macvlan_dev *vlan = netdev_priv(dev);
742 struct sockaddr *addr = p;
743
744 if (!is_valid_ether_addr(addr->sa_data))
745 return -EADDRNOTAVAIL;
746
747 /* If the addresses are the same, this is a no-op */
748 if (ether_addr_equal(dev->dev_addr, addr->sa_data))
749 return 0;
750
751 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
752 macvlan_set_addr_change(vlan->port);
753 return dev_set_mac_address(vlan->lowerdev, addr);
754 }
755
756 return macvlan_sync_address(dev, addr->sa_data);
757 }
758
759 static void macvlan_change_rx_flags(struct net_device *dev, int change)
760 {
761 struct macvlan_dev *vlan = netdev_priv(dev);
762 struct net_device *lowerdev = vlan->lowerdev;
763
764 if (dev->flags & IFF_UP) {
765 if (change & IFF_ALLMULTI)
766 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
767 if (change & IFF_PROMISC)
768 dev_set_promiscuity(lowerdev,
769 dev->flags & IFF_PROMISC ? 1 : -1);
770
771 }
772 }
773
774 static void macvlan_compute_filter(unsigned long *mc_filter,
775 struct net_device *dev,
776 struct macvlan_dev *vlan)
777 {
778 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
779 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
780 } else {
781 struct netdev_hw_addr *ha;
782 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
783
784 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
785 netdev_for_each_mc_addr(ha, dev) {
786 __set_bit(mc_hash(vlan, ha->addr), filter);
787 }
788
789 __set_bit(mc_hash(vlan, dev->broadcast), filter);
790
791 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
792 }
793 }
794
795 static void macvlan_set_mac_lists(struct net_device *dev)
796 {
797 struct macvlan_dev *vlan = netdev_priv(dev);
798
799 macvlan_compute_filter(vlan->mc_filter, dev, vlan);
800
801 dev_uc_sync(vlan->lowerdev, dev);
802 dev_mc_sync(vlan->lowerdev, dev);
803
804 /* This is slightly inaccurate as we're including the subscription
805 * list of vlan->lowerdev too.
806 *
807 * Bug alert: This only works if everyone has the same broadcast
808 * address as lowerdev. As soon as someone changes theirs this
809 * will break.
810 *
811 * However, this is already broken as when you change your broadcast
812 * address we don't get called.
813 *
814 * The solution is to maintain a list of broadcast addresses like
815 * we do for uc/mc, if you care.
816 */
817 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
818 }
819
820 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
821 {
822 struct macvlan_dev *vlan = netdev_priv(dev);
823
824 if (vlan->lowerdev->mtu < new_mtu)
825 return -EINVAL;
826 dev->mtu = new_mtu;
827 return 0;
828 }
829
830 /*
831 * macvlan network devices have devices nesting below it and are a special
832 * "super class" of normal network devices; split their locks off into a
833 * separate class since they always nest.
834 */
835 static struct lock_class_key macvlan_netdev_addr_lock_key;
836
837 #define ALWAYS_ON_OFFLOADS \
838 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
839 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
840
841 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
842
843 #define MACVLAN_FEATURES \
844 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
845 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
846 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
847 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
848
849 #define MACVLAN_STATE_MASK \
850 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
851
852 static int macvlan_get_nest_level(struct net_device *dev)
853 {
854 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
855 }
856
857 static void macvlan_set_lockdep_class(struct net_device *dev)
858 {
859 netdev_lockdep_set_classes(dev);
860 lockdep_set_class_and_subclass(&dev->addr_list_lock,
861 &macvlan_netdev_addr_lock_key,
862 macvlan_get_nest_level(dev));
863 }
864
865 static int macvlan_init(struct net_device *dev)
866 {
867 struct macvlan_dev *vlan = netdev_priv(dev);
868 const struct net_device *lowerdev = vlan->lowerdev;
869 struct macvlan_port *port = vlan->port;
870
871 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
872 (lowerdev->state & MACVLAN_STATE_MASK);
873 dev->features = lowerdev->features & MACVLAN_FEATURES;
874 dev->features |= ALWAYS_ON_FEATURES;
875 dev->hw_features |= NETIF_F_LRO;
876 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
877 dev->vlan_features |= ALWAYS_ON_OFFLOADS;
878 dev->hw_enc_features |= dev->features;
879 dev->gso_max_size = lowerdev->gso_max_size;
880 dev->gso_max_segs = lowerdev->gso_max_segs;
881 dev->hard_header_len = lowerdev->hard_header_len;
882
883 macvlan_set_lockdep_class(dev);
884
885 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
886 if (!vlan->pcpu_stats)
887 return -ENOMEM;
888
889 port->count += 1;
890
891 return 0;
892 }
893
894 static void macvlan_uninit(struct net_device *dev)
895 {
896 struct macvlan_dev *vlan = netdev_priv(dev);
897 struct macvlan_port *port = vlan->port;
898
899 free_percpu(vlan->pcpu_stats);
900
901 macvlan_flush_sources(port, vlan);
902 port->count -= 1;
903 if (!port->count)
904 macvlan_port_destroy(port->dev);
905 }
906
907 static void macvlan_dev_get_stats64(struct net_device *dev,
908 struct rtnl_link_stats64 *stats)
909 {
910 struct macvlan_dev *vlan = netdev_priv(dev);
911
912 if (vlan->pcpu_stats) {
913 struct vlan_pcpu_stats *p;
914 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
915 u32 rx_errors = 0, tx_dropped = 0;
916 unsigned int start;
917 int i;
918
919 for_each_possible_cpu(i) {
920 p = per_cpu_ptr(vlan->pcpu_stats, i);
921 do {
922 start = u64_stats_fetch_begin_irq(&p->syncp);
923 rx_packets = p->rx_packets;
924 rx_bytes = p->rx_bytes;
925 rx_multicast = p->rx_multicast;
926 tx_packets = p->tx_packets;
927 tx_bytes = p->tx_bytes;
928 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
929
930 stats->rx_packets += rx_packets;
931 stats->rx_bytes += rx_bytes;
932 stats->multicast += rx_multicast;
933 stats->tx_packets += tx_packets;
934 stats->tx_bytes += tx_bytes;
935 /* rx_errors & tx_dropped are u32, updated
936 * without syncp protection.
937 */
938 rx_errors += p->rx_errors;
939 tx_dropped += p->tx_dropped;
940 }
941 stats->rx_errors = rx_errors;
942 stats->rx_dropped = rx_errors;
943 stats->tx_dropped = tx_dropped;
944 }
945 }
946
947 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
948 __be16 proto, u16 vid)
949 {
950 struct macvlan_dev *vlan = netdev_priv(dev);
951 struct net_device *lowerdev = vlan->lowerdev;
952
953 return vlan_vid_add(lowerdev, proto, vid);
954 }
955
956 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
957 __be16 proto, u16 vid)
958 {
959 struct macvlan_dev *vlan = netdev_priv(dev);
960 struct net_device *lowerdev = vlan->lowerdev;
961
962 vlan_vid_del(lowerdev, proto, vid);
963 return 0;
964 }
965
966 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
967 struct net_device *dev,
968 const unsigned char *addr, u16 vid,
969 u16 flags)
970 {
971 struct macvlan_dev *vlan = netdev_priv(dev);
972 int err = -EINVAL;
973
974 /* Support unicast filter only on passthru devices.
975 * Multicast filter should be allowed on all devices.
976 */
977 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
978 return -EOPNOTSUPP;
979
980 if (flags & NLM_F_REPLACE)
981 return -EOPNOTSUPP;
982
983 if (is_unicast_ether_addr(addr))
984 err = dev_uc_add_excl(dev, addr);
985 else if (is_multicast_ether_addr(addr))
986 err = dev_mc_add_excl(dev, addr);
987
988 return err;
989 }
990
991 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
992 struct net_device *dev,
993 const unsigned char *addr, u16 vid)
994 {
995 struct macvlan_dev *vlan = netdev_priv(dev);
996 int err = -EINVAL;
997
998 /* Support unicast filter only on passthru devices.
999 * Multicast filter should be allowed on all devices.
1000 */
1001 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1002 return -EOPNOTSUPP;
1003
1004 if (is_unicast_ether_addr(addr))
1005 err = dev_uc_del(dev, addr);
1006 else if (is_multicast_ether_addr(addr))
1007 err = dev_mc_del(dev, addr);
1008
1009 return err;
1010 }
1011
1012 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1013 struct ethtool_drvinfo *drvinfo)
1014 {
1015 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1016 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1017 }
1018
1019 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1020 struct ethtool_link_ksettings *cmd)
1021 {
1022 const struct macvlan_dev *vlan = netdev_priv(dev);
1023
1024 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1025 }
1026
1027 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1028 netdev_features_t features)
1029 {
1030 struct macvlan_dev *vlan = netdev_priv(dev);
1031 netdev_features_t lowerdev_features = vlan->lowerdev->features;
1032 netdev_features_t mask;
1033
1034 features |= NETIF_F_ALL_FOR_ALL;
1035 features &= (vlan->set_features | ~MACVLAN_FEATURES);
1036 mask = features;
1037
1038 lowerdev_features &= (features | ~NETIF_F_LRO);
1039 features = netdev_increment_features(lowerdev_features, features, mask);
1040 features |= ALWAYS_ON_FEATURES;
1041 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1042
1043 return features;
1044 }
1045
1046 #ifdef CONFIG_NET_POLL_CONTROLLER
1047 static void macvlan_dev_poll_controller(struct net_device *dev)
1048 {
1049 return;
1050 }
1051
1052 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1053 {
1054 struct macvlan_dev *vlan = netdev_priv(dev);
1055 struct net_device *real_dev = vlan->lowerdev;
1056 struct netpoll *netpoll;
1057 int err = 0;
1058
1059 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1060 err = -ENOMEM;
1061 if (!netpoll)
1062 goto out;
1063
1064 err = __netpoll_setup(netpoll, real_dev);
1065 if (err) {
1066 kfree(netpoll);
1067 goto out;
1068 }
1069
1070 vlan->netpoll = netpoll;
1071
1072 out:
1073 return err;
1074 }
1075
1076 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1077 {
1078 struct macvlan_dev *vlan = netdev_priv(dev);
1079 struct netpoll *netpoll = vlan->netpoll;
1080
1081 if (!netpoll)
1082 return;
1083
1084 vlan->netpoll = NULL;
1085
1086 __netpoll_free_async(netpoll);
1087 }
1088 #endif /* CONFIG_NET_POLL_CONTROLLER */
1089
1090 static int macvlan_dev_get_iflink(const struct net_device *dev)
1091 {
1092 struct macvlan_dev *vlan = netdev_priv(dev);
1093
1094 return vlan->lowerdev->ifindex;
1095 }
1096
1097 static const struct ethtool_ops macvlan_ethtool_ops = {
1098 .get_link = ethtool_op_get_link,
1099 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1100 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1101 };
1102
1103 static const struct net_device_ops macvlan_netdev_ops = {
1104 .ndo_init = macvlan_init,
1105 .ndo_uninit = macvlan_uninit,
1106 .ndo_open = macvlan_open,
1107 .ndo_stop = macvlan_stop,
1108 .ndo_start_xmit = macvlan_start_xmit,
1109 .ndo_change_mtu = macvlan_change_mtu,
1110 .ndo_fix_features = macvlan_fix_features,
1111 .ndo_change_rx_flags = macvlan_change_rx_flags,
1112 .ndo_set_mac_address = macvlan_set_mac_address,
1113 .ndo_set_rx_mode = macvlan_set_mac_lists,
1114 .ndo_get_stats64 = macvlan_dev_get_stats64,
1115 .ndo_validate_addr = eth_validate_addr,
1116 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1117 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1118 .ndo_fdb_add = macvlan_fdb_add,
1119 .ndo_fdb_del = macvlan_fdb_del,
1120 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1121 .ndo_get_lock_subclass = macvlan_get_nest_level,
1122 #ifdef CONFIG_NET_POLL_CONTROLLER
1123 .ndo_poll_controller = macvlan_dev_poll_controller,
1124 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1125 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1126 #endif
1127 .ndo_get_iflink = macvlan_dev_get_iflink,
1128 .ndo_features_check = passthru_features_check,
1129 };
1130
1131 void macvlan_common_setup(struct net_device *dev)
1132 {
1133 ether_setup(dev);
1134
1135 dev->min_mtu = 0;
1136 dev->max_mtu = ETH_MAX_MTU;
1137 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1138 netif_keep_dst(dev);
1139 dev->priv_flags |= IFF_UNICAST_FLT;
1140 dev->netdev_ops = &macvlan_netdev_ops;
1141 dev->needs_free_netdev = true;
1142 dev->header_ops = &macvlan_hard_header_ops;
1143 dev->ethtool_ops = &macvlan_ethtool_ops;
1144 }
1145 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1146
1147 static void macvlan_setup(struct net_device *dev)
1148 {
1149 macvlan_common_setup(dev);
1150 dev->priv_flags |= IFF_NO_QUEUE;
1151 }
1152
1153 static int macvlan_port_create(struct net_device *dev)
1154 {
1155 struct macvlan_port *port;
1156 unsigned int i;
1157 int err;
1158
1159 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1160 return -EINVAL;
1161
1162 if (netdev_is_rx_handler_busy(dev))
1163 return -EBUSY;
1164
1165 port = kzalloc(sizeof(*port), GFP_KERNEL);
1166 if (port == NULL)
1167 return -ENOMEM;
1168
1169 port->dev = dev;
1170 ether_addr_copy(port->perm_addr, dev->dev_addr);
1171 INIT_LIST_HEAD(&port->vlans);
1172 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1173 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1174 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1175 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1176
1177 skb_queue_head_init(&port->bc_queue);
1178 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1179
1180 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1181 if (err)
1182 kfree(port);
1183 else
1184 dev->priv_flags |= IFF_MACVLAN_PORT;
1185 return err;
1186 }
1187
1188 static void macvlan_port_destroy(struct net_device *dev)
1189 {
1190 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1191 struct sk_buff *skb;
1192
1193 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1194 netdev_rx_handler_unregister(dev);
1195
1196 /* After this point, no packet can schedule bc_work anymore,
1197 * but we need to cancel it and purge left skbs if any.
1198 */
1199 cancel_work_sync(&port->bc_work);
1200
1201 while ((skb = __skb_dequeue(&port->bc_queue))) {
1202 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1203
1204 if (src)
1205 dev_put(src->dev);
1206
1207 kfree_skb(skb);
1208 }
1209
1210 /* If the lower device address has been changed by passthru
1211 * macvlan, put it back.
1212 */
1213 if (macvlan_passthru(port) &&
1214 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1215 struct sockaddr sa;
1216
1217 sa.sa_family = port->dev->type;
1218 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1219 dev_set_mac_address(port->dev, &sa);
1220 }
1221
1222 kfree(port);
1223 }
1224
1225 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1226 struct netlink_ext_ack *extack)
1227 {
1228 if (tb[IFLA_ADDRESS]) {
1229 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1230 return -EINVAL;
1231 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1232 return -EADDRNOTAVAIL;
1233 }
1234
1235 if (!data)
1236 return 0;
1237
1238 if (data[IFLA_MACVLAN_FLAGS] &&
1239 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1240 return -EINVAL;
1241
1242 if (data[IFLA_MACVLAN_MODE]) {
1243 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1244 case MACVLAN_MODE_PRIVATE:
1245 case MACVLAN_MODE_VEPA:
1246 case MACVLAN_MODE_BRIDGE:
1247 case MACVLAN_MODE_PASSTHRU:
1248 case MACVLAN_MODE_SOURCE:
1249 break;
1250 default:
1251 return -EINVAL;
1252 }
1253 }
1254
1255 if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1256 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1257 case MACVLAN_MACADDR_ADD:
1258 case MACVLAN_MACADDR_DEL:
1259 case MACVLAN_MACADDR_FLUSH:
1260 case MACVLAN_MACADDR_SET:
1261 break;
1262 default:
1263 return -EINVAL;
1264 }
1265 }
1266
1267 if (data[IFLA_MACVLAN_MACADDR]) {
1268 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1269 return -EINVAL;
1270
1271 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1272 return -EADDRNOTAVAIL;
1273 }
1274
1275 if (data[IFLA_MACVLAN_MACADDR_COUNT])
1276 return -EINVAL;
1277
1278 return 0;
1279 }
1280
1281 /**
1282 * reconfigure list of remote source mac address
1283 * (only for macvlan devices in source mode)
1284 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1285 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1286 */
1287 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1288 struct nlattr *data[])
1289 {
1290 char *addr = NULL;
1291 int ret, rem, len;
1292 struct nlattr *nla, *head;
1293 struct macvlan_source_entry *entry;
1294
1295 if (data[IFLA_MACVLAN_MACADDR])
1296 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1297
1298 if (mode == MACVLAN_MACADDR_ADD) {
1299 if (!addr)
1300 return -EINVAL;
1301
1302 return macvlan_hash_add_source(vlan, addr);
1303
1304 } else if (mode == MACVLAN_MACADDR_DEL) {
1305 if (!addr)
1306 return -EINVAL;
1307
1308 entry = macvlan_hash_lookup_source(vlan, addr);
1309 if (entry) {
1310 macvlan_hash_del_source(entry);
1311 vlan->macaddr_count--;
1312 }
1313 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1314 macvlan_flush_sources(vlan->port, vlan);
1315 } else if (mode == MACVLAN_MACADDR_SET) {
1316 macvlan_flush_sources(vlan->port, vlan);
1317
1318 if (addr) {
1319 ret = macvlan_hash_add_source(vlan, addr);
1320 if (ret)
1321 return ret;
1322 }
1323
1324 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1325 return 0;
1326
1327 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1328 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1329
1330 nla_for_each_attr(nla, head, len, rem) {
1331 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1332 nla_len(nla) != ETH_ALEN)
1333 continue;
1334
1335 addr = nla_data(nla);
1336 ret = macvlan_hash_add_source(vlan, addr);
1337 if (ret)
1338 return ret;
1339 }
1340 } else {
1341 return -EINVAL;
1342 }
1343
1344 return 0;
1345 }
1346
1347 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1348 struct nlattr *tb[], struct nlattr *data[],
1349 struct netlink_ext_ack *extack)
1350 {
1351 struct macvlan_dev *vlan = netdev_priv(dev);
1352 struct macvlan_port *port;
1353 struct net_device *lowerdev;
1354 int err;
1355 int macmode;
1356 bool create = false;
1357
1358 if (!tb[IFLA_LINK])
1359 return -EINVAL;
1360
1361 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1362 if (lowerdev == NULL)
1363 return -ENODEV;
1364
1365 /* When creating macvlans or macvtaps on top of other macvlans - use
1366 * the real device as the lowerdev.
1367 */
1368 if (netif_is_macvlan(lowerdev))
1369 lowerdev = macvlan_dev_real_dev(lowerdev);
1370
1371 if (!tb[IFLA_MTU])
1372 dev->mtu = lowerdev->mtu;
1373 else if (dev->mtu > lowerdev->mtu)
1374 return -EINVAL;
1375
1376 /* MTU range: 68 - lowerdev->max_mtu */
1377 dev->min_mtu = ETH_MIN_MTU;
1378 dev->max_mtu = lowerdev->max_mtu;
1379
1380 if (!tb[IFLA_ADDRESS])
1381 eth_hw_addr_random(dev);
1382
1383 if (!macvlan_port_exists(lowerdev)) {
1384 err = macvlan_port_create(lowerdev);
1385 if (err < 0)
1386 return err;
1387 create = true;
1388 }
1389 port = macvlan_port_get_rtnl(lowerdev);
1390
1391 /* Only 1 macvlan device can be created in passthru mode */
1392 if (macvlan_passthru(port)) {
1393 /* The macvlan port must be not created this time,
1394 * still goto destroy_macvlan_port for readability.
1395 */
1396 err = -EINVAL;
1397 goto destroy_macvlan_port;
1398 }
1399
1400 vlan->lowerdev = lowerdev;
1401 vlan->dev = dev;
1402 vlan->port = port;
1403 vlan->set_features = MACVLAN_FEATURES;
1404 vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1405
1406 vlan->mode = MACVLAN_MODE_VEPA;
1407 if (data && data[IFLA_MACVLAN_MODE])
1408 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1409
1410 if (data && data[IFLA_MACVLAN_FLAGS])
1411 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1412
1413 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1414 if (port->count) {
1415 err = -EINVAL;
1416 goto destroy_macvlan_port;
1417 }
1418 macvlan_set_passthru(port);
1419 eth_hw_addr_inherit(dev, lowerdev);
1420 }
1421
1422 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1423 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1424 err = -EINVAL;
1425 goto destroy_macvlan_port;
1426 }
1427 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1428 err = macvlan_changelink_sources(vlan, macmode, data);
1429 if (err)
1430 goto destroy_macvlan_port;
1431 }
1432
1433 err = register_netdevice(dev);
1434 if (err < 0)
1435 goto destroy_macvlan_port;
1436
1437 dev->priv_flags |= IFF_MACVLAN;
1438 err = netdev_upper_dev_link(lowerdev, dev, extack);
1439 if (err)
1440 goto unregister_netdev;
1441
1442 list_add_tail_rcu(&vlan->list, &port->vlans);
1443 netif_stacked_transfer_operstate(lowerdev, dev);
1444 linkwatch_fire_event(dev);
1445
1446 return 0;
1447
1448 unregister_netdev:
1449 /* macvlan_uninit would free the macvlan port */
1450 unregister_netdevice(dev);
1451 return err;
1452 destroy_macvlan_port:
1453 /* the macvlan port may be freed by macvlan_uninit when fail to register.
1454 * so we destroy the macvlan port only when it's valid.
1455 */
1456 if (create && macvlan_port_get_rtnl(lowerdev))
1457 macvlan_port_destroy(port->dev);
1458 return err;
1459 }
1460 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1461
1462 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1463 struct nlattr *tb[], struct nlattr *data[],
1464 struct netlink_ext_ack *extack)
1465 {
1466 return macvlan_common_newlink(src_net, dev, tb, data, extack);
1467 }
1468
1469 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1470 {
1471 struct macvlan_dev *vlan = netdev_priv(dev);
1472
1473 if (vlan->mode == MACVLAN_MODE_SOURCE)
1474 macvlan_flush_sources(vlan->port, vlan);
1475 list_del_rcu(&vlan->list);
1476 unregister_netdevice_queue(dev, head);
1477 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1478 }
1479 EXPORT_SYMBOL_GPL(macvlan_dellink);
1480
1481 static int macvlan_changelink(struct net_device *dev,
1482 struct nlattr *tb[], struct nlattr *data[],
1483 struct netlink_ext_ack *extack)
1484 {
1485 struct macvlan_dev *vlan = netdev_priv(dev);
1486 enum macvlan_mode mode;
1487 bool set_mode = false;
1488 enum macvlan_macaddr_mode macmode;
1489 int ret;
1490
1491 /* Validate mode, but don't set yet: setting flags may fail. */
1492 if (data && data[IFLA_MACVLAN_MODE]) {
1493 set_mode = true;
1494 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1495 /* Passthrough mode can't be set or cleared dynamically */
1496 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1497 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1498 return -EINVAL;
1499 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1500 vlan->mode != mode)
1501 macvlan_flush_sources(vlan->port, vlan);
1502 }
1503
1504 if (data && data[IFLA_MACVLAN_FLAGS]) {
1505 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1506 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1507 if (macvlan_passthru(vlan->port) && promisc) {
1508 int err;
1509
1510 if (flags & MACVLAN_FLAG_NOPROMISC)
1511 err = dev_set_promiscuity(vlan->lowerdev, -1);
1512 else
1513 err = dev_set_promiscuity(vlan->lowerdev, 1);
1514 if (err < 0)
1515 return err;
1516 }
1517 vlan->flags = flags;
1518 }
1519 if (set_mode)
1520 vlan->mode = mode;
1521 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1522 if (vlan->mode != MACVLAN_MODE_SOURCE)
1523 return -EINVAL;
1524 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1525 ret = macvlan_changelink_sources(vlan, macmode, data);
1526 if (ret)
1527 return ret;
1528 }
1529 return 0;
1530 }
1531
1532 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1533 {
1534 if (vlan->macaddr_count == 0)
1535 return 0;
1536 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1537 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1538 }
1539
1540 static size_t macvlan_get_size(const struct net_device *dev)
1541 {
1542 struct macvlan_dev *vlan = netdev_priv(dev);
1543
1544 return (0
1545 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1546 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1547 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1548 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1549 );
1550 }
1551
1552 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1553 const struct macvlan_dev *vlan,
1554 const int i)
1555 {
1556 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1557 struct macvlan_source_entry *entry;
1558
1559 hlist_for_each_entry_rcu(entry, h, hlist) {
1560 if (entry->vlan != vlan)
1561 continue;
1562 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1563 return 1;
1564 }
1565 return 0;
1566 }
1567
1568 static int macvlan_fill_info(struct sk_buff *skb,
1569 const struct net_device *dev)
1570 {
1571 struct macvlan_dev *vlan = netdev_priv(dev);
1572 int i;
1573 struct nlattr *nest;
1574
1575 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1576 goto nla_put_failure;
1577 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1578 goto nla_put_failure;
1579 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1580 goto nla_put_failure;
1581 if (vlan->macaddr_count > 0) {
1582 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1583 if (nest == NULL)
1584 goto nla_put_failure;
1585
1586 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1587 if (macvlan_fill_info_macaddr(skb, vlan, i))
1588 goto nla_put_failure;
1589 }
1590 nla_nest_end(skb, nest);
1591 }
1592 return 0;
1593
1594 nla_put_failure:
1595 return -EMSGSIZE;
1596 }
1597
1598 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1599 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1600 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1601 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1602 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1603 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1604 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1605 };
1606
1607 int macvlan_link_register(struct rtnl_link_ops *ops)
1608 {
1609 /* common fields */
1610 ops->validate = macvlan_validate;
1611 ops->maxtype = IFLA_MACVLAN_MAX;
1612 ops->policy = macvlan_policy;
1613 ops->changelink = macvlan_changelink;
1614 ops->get_size = macvlan_get_size;
1615 ops->fill_info = macvlan_fill_info;
1616
1617 return rtnl_link_register(ops);
1618 };
1619 EXPORT_SYMBOL_GPL(macvlan_link_register);
1620
1621 static struct net *macvlan_get_link_net(const struct net_device *dev)
1622 {
1623 return dev_net(macvlan_dev_real_dev(dev));
1624 }
1625
1626 static struct rtnl_link_ops macvlan_link_ops = {
1627 .kind = "macvlan",
1628 .setup = macvlan_setup,
1629 .newlink = macvlan_newlink,
1630 .dellink = macvlan_dellink,
1631 .get_link_net = macvlan_get_link_net,
1632 .priv_size = sizeof(struct macvlan_dev),
1633 };
1634
1635 static int macvlan_device_event(struct notifier_block *unused,
1636 unsigned long event, void *ptr)
1637 {
1638 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1639 struct macvlan_dev *vlan, *next;
1640 struct macvlan_port *port;
1641 LIST_HEAD(list_kill);
1642
1643 if (!macvlan_port_exists(dev))
1644 return NOTIFY_DONE;
1645
1646 port = macvlan_port_get_rtnl(dev);
1647
1648 switch (event) {
1649 case NETDEV_UP:
1650 case NETDEV_CHANGE:
1651 list_for_each_entry(vlan, &port->vlans, list)
1652 netif_stacked_transfer_operstate(vlan->lowerdev,
1653 vlan->dev);
1654 break;
1655 case NETDEV_FEAT_CHANGE:
1656 list_for_each_entry(vlan, &port->vlans, list) {
1657 vlan->dev->gso_max_size = dev->gso_max_size;
1658 vlan->dev->gso_max_segs = dev->gso_max_segs;
1659 netdev_update_features(vlan->dev);
1660 }
1661 break;
1662 case NETDEV_CHANGEMTU:
1663 list_for_each_entry(vlan, &port->vlans, list) {
1664 if (vlan->dev->mtu <= dev->mtu)
1665 continue;
1666 dev_set_mtu(vlan->dev, dev->mtu);
1667 }
1668 break;
1669 case NETDEV_CHANGEADDR:
1670 if (!macvlan_passthru(port))
1671 return NOTIFY_DONE;
1672
1673 vlan = list_first_entry_or_null(&port->vlans,
1674 struct macvlan_dev,
1675 list);
1676
1677 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1678 return NOTIFY_BAD;
1679
1680 break;
1681 case NETDEV_UNREGISTER:
1682 /* twiddle thumbs on netns device moves */
1683 if (dev->reg_state != NETREG_UNREGISTERING)
1684 break;
1685
1686 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1687 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1688 unregister_netdevice_many(&list_kill);
1689 break;
1690 case NETDEV_PRE_TYPE_CHANGE:
1691 /* Forbid underlaying device to change its type. */
1692 return NOTIFY_BAD;
1693
1694 case NETDEV_NOTIFY_PEERS:
1695 case NETDEV_BONDING_FAILOVER:
1696 case NETDEV_RESEND_IGMP:
1697 /* Propagate to all vlans */
1698 list_for_each_entry(vlan, &port->vlans, list)
1699 call_netdevice_notifiers(event, vlan->dev);
1700 }
1701 return NOTIFY_DONE;
1702 }
1703
1704 static struct notifier_block macvlan_notifier_block __read_mostly = {
1705 .notifier_call = macvlan_device_event,
1706 };
1707
1708 static int __init macvlan_init_module(void)
1709 {
1710 int err;
1711
1712 register_netdevice_notifier(&macvlan_notifier_block);
1713
1714 err = macvlan_link_register(&macvlan_link_ops);
1715 if (err < 0)
1716 goto err1;
1717 return 0;
1718 err1:
1719 unregister_netdevice_notifier(&macvlan_notifier_block);
1720 return err;
1721 }
1722
1723 static void __exit macvlan_cleanup_module(void)
1724 {
1725 rtnl_link_unregister(&macvlan_link_ops);
1726 unregister_netdevice_notifier(&macvlan_notifier_block);
1727 }
1728
1729 module_init(macvlan_init_module);
1730 module_exit(macvlan_cleanup_module);
1731
1732 MODULE_LICENSE("GPL");
1733 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1734 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1735 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux with added FPC-III support