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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / macvlan.c
blob81aa7adf480123cc15e1f8b2722128d6b2fa6236
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
4 *
5 * The code this is based on carried the following copyright notice:
6 * ---
7 * (C) Copyright 2001-2006
8 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
9 * Re-worked by Ben Greear <greearb@candelatech.com>
10 * ---
11 */
12 #include <linux/kernel.h>
13 #include <linux/types.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/string.h>
19 #include <linux/rculist.h>
20 #include <linux/notifier.h>
21 #include <linux/netdevice.h>
22 #include <linux/etherdevice.h>
23 #include <linux/net_tstamp.h>
24 #include <linux/ethtool.h>
25 #include <linux/if_arp.h>
26 #include <linux/if_vlan.h>
27 #include <linux/if_link.h>
28 #include <linux/if_macvlan.h>
29 #include <linux/hash.h>
30 #include <linux/workqueue.h>
31 #include <net/rtnetlink.h>
32 #include <net/xfrm.h>
33 #include <linux/netpoll.h>
34 #include <linux/phy.h>
35
36 #define MACVLAN_HASH_BITS 8
37 #define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS)
38 #define MACVLAN_BC_QUEUE_LEN 1000
39
40 #define MACVLAN_F_PASSTHRU 1
41 #define MACVLAN_F_ADDRCHANGE 2
42
43 struct macvlan_port {
44 struct net_device *dev;
45 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
46 struct list_head vlans;
47 struct sk_buff_head bc_queue;
48 struct work_struct bc_work;
49 u32 flags;
50 int count;
51 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
52 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
53 unsigned char perm_addr[ETH_ALEN];
54 };
55
56 struct macvlan_source_entry {
57 struct hlist_node hlist;
58 struct macvlan_dev *vlan;
59 unsigned char addr[6+2] __aligned(sizeof(u16));
60 struct rcu_head rcu;
61 };
62
63 struct macvlan_skb_cb {
64 const struct macvlan_dev *src;
65 };
66
67 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
68
69 static void macvlan_port_destroy(struct net_device *dev);
70
71 static inline bool macvlan_passthru(const struct macvlan_port *port)
72 {
73 return port->flags & MACVLAN_F_PASSTHRU;
74 }
75
76 static inline void macvlan_set_passthru(struct macvlan_port *port)
77 {
78 port->flags |= MACVLAN_F_PASSTHRU;
79 }
80
81 static inline bool macvlan_addr_change(const struct macvlan_port *port)
82 {
83 return port->flags & MACVLAN_F_ADDRCHANGE;
84 }
85
86 static inline void macvlan_set_addr_change(struct macvlan_port *port)
87 {
88 port->flags |= MACVLAN_F_ADDRCHANGE;
89 }
90
91 static inline void macvlan_clear_addr_change(struct macvlan_port *port)
92 {
93 port->flags &= ~MACVLAN_F_ADDRCHANGE;
94 }
95
96 /* Hash Ethernet address */
97 static u32 macvlan_eth_hash(const unsigned char *addr)
98 {
99 u64 value = get_unaligned((u64 *)addr);
100
101 /* only want 6 bytes */
102 #ifdef __BIG_ENDIAN
103 value >>= 16;
104 #else
105 value <<= 16;
106 #endif
107 return hash_64(value, MACVLAN_HASH_BITS);
108 }
109
110 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
111 {
112 return rcu_dereference(dev->rx_handler_data);
113 }
114
115 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
116 {
117 return rtnl_dereference(dev->rx_handler_data);
118 }
119
120 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
121 const unsigned char *addr)
122 {
123 struct macvlan_dev *vlan;
124 u32 idx = macvlan_eth_hash(addr);
125
126 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) {
127 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
128 return vlan;
129 }
130 return NULL;
131 }
132
133 static struct macvlan_source_entry *macvlan_hash_lookup_source(
134 const struct macvlan_dev *vlan,
135 const unsigned char *addr)
136 {
137 struct macvlan_source_entry *entry;
138 u32 idx = macvlan_eth_hash(addr);
139 struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
140
141 hlist_for_each_entry_rcu(entry, h, hlist) {
142 if (ether_addr_equal_64bits(entry->addr, addr) &&
143 entry->vlan == vlan)
144 return entry;
145 }
146 return NULL;
147 }
148
149 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
150 const unsigned char *addr)
151 {
152 struct macvlan_port *port = vlan->port;
153 struct macvlan_source_entry *entry;
154 struct hlist_head *h;
155
156 entry = macvlan_hash_lookup_source(vlan, addr);
157 if (entry)
158 return 0;
159
160 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
161 if (!entry)
162 return -ENOMEM;
163
164 ether_addr_copy(entry->addr, addr);
165 entry->vlan = vlan;
166 h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
167 hlist_add_head_rcu(&entry->hlist, h);
168 vlan->macaddr_count++;
169
170 return 0;
171 }
172
173 static void macvlan_hash_add(struct macvlan_dev *vlan)
174 {
175 struct macvlan_port *port = vlan->port;
176 const unsigned char *addr = vlan->dev->dev_addr;
177 u32 idx = macvlan_eth_hash(addr);
178
179 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
180 }
181
182 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
183 {
184 hlist_del_rcu(&entry->hlist);
185 kfree_rcu(entry, rcu);
186 }
187
188 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
189 {
190 hlist_del_rcu(&vlan->hlist);
191 if (sync)
192 synchronize_rcu();
193 }
194
195 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
196 const unsigned char *addr)
197 {
198 macvlan_hash_del(vlan, true);
199 /* Now that we are unhashed it is safe to change the device
200 * address without confusing packet delivery.
201 */
202 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
203 macvlan_hash_add(vlan);
204 }
205
206 static bool macvlan_addr_busy(const struct macvlan_port *port,
207 const unsigned char *addr)
208 {
209 /* Test to see if the specified address is
210 * currently in use by the underlying device or
211 * another macvlan.
212 */
213 if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
214 ether_addr_equal_64bits(port->dev->dev_addr, addr))
215 return true;
216
217 if (macvlan_hash_lookup(port, addr))
218 return true;
219
220 return false;
221 }
222
223
224 static int macvlan_broadcast_one(struct sk_buff *skb,
225 const struct macvlan_dev *vlan,
226 const struct ethhdr *eth, bool local)
227 {
228 struct net_device *dev = vlan->dev;
229
230 if (local)
231 return __dev_forward_skb(dev, skb);
232
233 skb->dev = dev;
234 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
235 skb->pkt_type = PACKET_BROADCAST;
236 else
237 skb->pkt_type = PACKET_MULTICAST;
238
239 return 0;
240 }
241
242 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
243 {
244 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
245 }
246
247
248 static unsigned int mc_hash(const struct macvlan_dev *vlan,
249 const unsigned char *addr)
250 {
251 u32 val = __get_unaligned_cpu32(addr + 2);
252
253 val ^= macvlan_hash_mix(vlan);
254 return hash_32(val, MACVLAN_MC_FILTER_BITS);
255 }
256
257 static void macvlan_broadcast(struct sk_buff *skb,
258 const struct macvlan_port *port,
259 struct net_device *src,
260 enum macvlan_mode mode)
261 {
262 const struct ethhdr *eth = eth_hdr(skb);
263 const struct macvlan_dev *vlan;
264 struct sk_buff *nskb;
265 unsigned int i;
266 int err;
267 unsigned int hash;
268
269 if (skb->protocol == htons(ETH_P_PAUSE))
270 return;
271
272 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
273 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
274 if (vlan->dev == src || !(vlan->mode & mode))
275 continue;
276
277 hash = mc_hash(vlan, eth->h_dest);
278 if (!test_bit(hash, vlan->mc_filter))
279 continue;
280
281 err = NET_RX_DROP;
282 nskb = skb_clone(skb, GFP_ATOMIC);
283 if (likely(nskb))
284 err = macvlan_broadcast_one(
285 nskb, vlan, eth,
286 mode == MACVLAN_MODE_BRIDGE) ?:
287 netif_rx_ni(nskb);
288 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
289 err == NET_RX_SUCCESS, true);
290 }
291 }
292 }
293
294 static void macvlan_process_broadcast(struct work_struct *w)
295 {
296 struct macvlan_port *port = container_of(w, struct macvlan_port,
297 bc_work);
298 struct sk_buff *skb;
299 struct sk_buff_head list;
300
301 __skb_queue_head_init(&list);
302
303 spin_lock_bh(&port->bc_queue.lock);
304 skb_queue_splice_tail_init(&port->bc_queue, &list);
305 spin_unlock_bh(&port->bc_queue.lock);
306
307 while ((skb = __skb_dequeue(&list))) {
308 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
309
310 rcu_read_lock();
311
312 if (!src)
313 /* frame comes from an external address */
314 macvlan_broadcast(skb, port, NULL,
315 MACVLAN_MODE_PRIVATE |
316 MACVLAN_MODE_VEPA |
317 MACVLAN_MODE_PASSTHRU|
318 MACVLAN_MODE_BRIDGE);
319 else if (src->mode == MACVLAN_MODE_VEPA)
320 /* flood to everyone except source */
321 macvlan_broadcast(skb, port, src->dev,
322 MACVLAN_MODE_VEPA |
323 MACVLAN_MODE_BRIDGE);
324 else
325 /*
326 * flood only to VEPA ports, bridge ports
327 * already saw the frame on the way out.
328 */
329 macvlan_broadcast(skb, port, src->dev,
330 MACVLAN_MODE_VEPA);
331
332 rcu_read_unlock();
333
334 if (src)
335 dev_put(src->dev);
336 consume_skb(skb);
337 }
338 }
339
340 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
341 const struct macvlan_dev *src,
342 struct sk_buff *skb)
343 {
344 struct sk_buff *nskb;
345 int err = -ENOMEM;
346
347 nskb = skb_clone(skb, GFP_ATOMIC);
348 if (!nskb)
349 goto err;
350
351 MACVLAN_SKB_CB(nskb)->src = src;
352
353 spin_lock(&port->bc_queue.lock);
354 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
355 if (src)
356 dev_hold(src->dev);
357 __skb_queue_tail(&port->bc_queue, nskb);
358 err = 0;
359 }
360 spin_unlock(&port->bc_queue.lock);
361
362 schedule_work(&port->bc_work);
363
364 if (err)
365 goto free_nskb;
366
367 return;
368
369 free_nskb:
370 kfree_skb(nskb);
371 err:
372 atomic_long_inc(&skb->dev->rx_dropped);
373 }
374
375 static void macvlan_flush_sources(struct macvlan_port *port,
376 struct macvlan_dev *vlan)
377 {
378 int i;
379
380 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
381 struct hlist_node *h, *n;
382
383 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
384 struct macvlan_source_entry *entry;
385
386 entry = hlist_entry(h, struct macvlan_source_entry,
387 hlist);
388 if (entry->vlan == vlan)
389 macvlan_hash_del_source(entry);
390 }
391 }
392 vlan->macaddr_count = 0;
393 }
394
395 static void macvlan_forward_source_one(struct sk_buff *skb,
396 struct macvlan_dev *vlan)
397 {
398 struct sk_buff *nskb;
399 struct net_device *dev;
400 int len;
401 int ret;
402
403 dev = vlan->dev;
404 if (unlikely(!(dev->flags & IFF_UP)))
405 return;
406
407 nskb = skb_clone(skb, GFP_ATOMIC);
408 if (!nskb)
409 return;
410
411 len = nskb->len + ETH_HLEN;
412 nskb->dev = dev;
413
414 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
415 nskb->pkt_type = PACKET_HOST;
416
417 ret = netif_rx(nskb);
418 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
419 }
420
421 static void macvlan_forward_source(struct sk_buff *skb,
422 struct macvlan_port *port,
423 const unsigned char *addr)
424 {
425 struct macvlan_source_entry *entry;
426 u32 idx = macvlan_eth_hash(addr);
427 struct hlist_head *h = &port->vlan_source_hash[idx];
428
429 hlist_for_each_entry_rcu(entry, h, hlist) {
430 if (ether_addr_equal_64bits(entry->addr, addr))
431 macvlan_forward_source_one(skb, entry->vlan);
432 }
433 }
434
435 /* called under rcu_read_lock() from netif_receive_skb */
436 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
437 {
438 struct macvlan_port *port;
439 struct sk_buff *skb = *pskb;
440 const struct ethhdr *eth = eth_hdr(skb);
441 const struct macvlan_dev *vlan;
442 const struct macvlan_dev *src;
443 struct net_device *dev;
444 unsigned int len = 0;
445 int ret;
446 rx_handler_result_t handle_res;
447
448 port = macvlan_port_get_rcu(skb->dev);
449 if (is_multicast_ether_addr(eth->h_dest)) {
450 unsigned int hash;
451
452 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
453 if (!skb)
454 return RX_HANDLER_CONSUMED;
455 *pskb = skb;
456 eth = eth_hdr(skb);
457 macvlan_forward_source(skb, port, eth->h_source);
458 src = macvlan_hash_lookup(port, eth->h_source);
459 if (src && src->mode != MACVLAN_MODE_VEPA &&
460 src->mode != MACVLAN_MODE_BRIDGE) {
461 /* forward to original port. */
462 vlan = src;
463 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
464 netif_rx(skb);
465 handle_res = RX_HANDLER_CONSUMED;
466 goto out;
467 }
468
469 hash = mc_hash(NULL, eth->h_dest);
470 if (test_bit(hash, port->mc_filter))
471 macvlan_broadcast_enqueue(port, src, skb);
472
473 return RX_HANDLER_PASS;
474 }
475
476 macvlan_forward_source(skb, port, eth->h_source);
477 if (macvlan_passthru(port))
478 vlan = list_first_or_null_rcu(&port->vlans,
479 struct macvlan_dev, list);
480 else
481 vlan = macvlan_hash_lookup(port, eth->h_dest);
482 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
483 return RX_HANDLER_PASS;
484
485 dev = vlan->dev;
486 if (unlikely(!(dev->flags & IFF_UP))) {
487 kfree_skb(skb);
488 return RX_HANDLER_CONSUMED;
489 }
490 len = skb->len + ETH_HLEN;
491 skb = skb_share_check(skb, GFP_ATOMIC);
492 if (!skb) {
493 ret = NET_RX_DROP;
494 handle_res = RX_HANDLER_CONSUMED;
495 goto out;
496 }
497
498 *pskb = skb;
499 skb->dev = dev;
500 skb->pkt_type = PACKET_HOST;
501
502 ret = NET_RX_SUCCESS;
503 handle_res = RX_HANDLER_ANOTHER;
504 out:
505 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
506 return handle_res;
507 }
508
509 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
510 {
511 const struct macvlan_dev *vlan = netdev_priv(dev);
512 const struct macvlan_port *port = vlan->port;
513 const struct macvlan_dev *dest;
514
515 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
516 const struct ethhdr *eth = skb_eth_hdr(skb);
517
518 /* send to other bridge ports directly */
519 if (is_multicast_ether_addr(eth->h_dest)) {
520 skb_reset_mac_header(skb);
521 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
522 goto xmit_world;
523 }
524
525 dest = macvlan_hash_lookup(port, eth->h_dest);
526 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
527 /* send to lowerdev first for its network taps */
528 dev_forward_skb(vlan->lowerdev, skb);
529
530 return NET_XMIT_SUCCESS;
531 }
532 }
533 xmit_world:
534 skb->dev = vlan->lowerdev;
535 return dev_queue_xmit_accel(skb,
536 netdev_get_sb_channel(dev) ? dev : NULL);
537 }
538
539 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
540 {
541 #ifdef CONFIG_NET_POLL_CONTROLLER
542 if (vlan->netpoll)
543 netpoll_send_skb(vlan->netpoll, skb);
544 #else
545 BUG();
546 #endif
547 return NETDEV_TX_OK;
548 }
549
550 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
551 struct net_device *dev)
552 {
553 struct macvlan_dev *vlan = netdev_priv(dev);
554 unsigned int len = skb->len;
555 int ret;
556
557 if (unlikely(netpoll_tx_running(dev)))
558 return macvlan_netpoll_send_skb(vlan, skb);
559
560 ret = macvlan_queue_xmit(skb, dev);
561
562 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
563 struct vlan_pcpu_stats *pcpu_stats;
564
565 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
566 u64_stats_update_begin(&pcpu_stats->syncp);
567 pcpu_stats->tx_packets++;
568 pcpu_stats->tx_bytes += len;
569 u64_stats_update_end(&pcpu_stats->syncp);
570 } else {
571 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
572 }
573 return ret;
574 }
575
576 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
577 unsigned short type, const void *daddr,
578 const void *saddr, unsigned len)
579 {
580 const struct macvlan_dev *vlan = netdev_priv(dev);
581 struct net_device *lowerdev = vlan->lowerdev;
582
583 return dev_hard_header(skb, lowerdev, type, daddr,
584 saddr ? : dev->dev_addr, len);
585 }
586
587 static const struct header_ops macvlan_hard_header_ops = {
588 .create = macvlan_hard_header,
589 .parse = eth_header_parse,
590 .cache = eth_header_cache,
591 .cache_update = eth_header_cache_update,
592 };
593
594 static int macvlan_open(struct net_device *dev)
595 {
596 struct macvlan_dev *vlan = netdev_priv(dev);
597 struct net_device *lowerdev = vlan->lowerdev;
598 int err;
599
600 if (macvlan_passthru(vlan->port)) {
601 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
602 err = dev_set_promiscuity(lowerdev, 1);
603 if (err < 0)
604 goto out;
605 }
606 goto hash_add;
607 }
608
609 err = -EADDRINUSE;
610 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
611 goto out;
612
613 /* Attempt to populate accel_priv which is used to offload the L2
614 * forwarding requests for unicast packets.
615 */
616 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
617 vlan->accel_priv =
618 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
619
620 /* If earlier attempt to offload failed, or accel_priv is not
621 * populated we must add the unicast address to the lower device.
622 */
623 if (IS_ERR_OR_NULL(vlan->accel_priv)) {
624 vlan->accel_priv = NULL;
625 err = dev_uc_add(lowerdev, dev->dev_addr);
626 if (err < 0)
627 goto out;
628 }
629
630 if (dev->flags & IFF_ALLMULTI) {
631 err = dev_set_allmulti(lowerdev, 1);
632 if (err < 0)
633 goto del_unicast;
634 }
635
636 if (dev->flags & IFF_PROMISC) {
637 err = dev_set_promiscuity(lowerdev, 1);
638 if (err < 0)
639 goto clear_multi;
640 }
641
642 hash_add:
643 macvlan_hash_add(vlan);
644 return 0;
645
646 clear_multi:
647 if (dev->flags & IFF_ALLMULTI)
648 dev_set_allmulti(lowerdev, -1);
649 del_unicast:
650 if (vlan->accel_priv) {
651 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
652 vlan->accel_priv);
653 vlan->accel_priv = NULL;
654 } else {
655 dev_uc_del(lowerdev, dev->dev_addr);
656 }
657 out:
658 return err;
659 }
660
661 static int macvlan_stop(struct net_device *dev)
662 {
663 struct macvlan_dev *vlan = netdev_priv(dev);
664 struct net_device *lowerdev = vlan->lowerdev;
665
666 if (vlan->accel_priv) {
667 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
668 vlan->accel_priv);
669 vlan->accel_priv = NULL;
670 }
671
672 dev_uc_unsync(lowerdev, dev);
673 dev_mc_unsync(lowerdev, dev);
674
675 if (macvlan_passthru(vlan->port)) {
676 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
677 dev_set_promiscuity(lowerdev, -1);
678 goto hash_del;
679 }
680
681 if (dev->flags & IFF_ALLMULTI)
682 dev_set_allmulti(lowerdev, -1);
683
684 if (dev->flags & IFF_PROMISC)
685 dev_set_promiscuity(lowerdev, -1);
686
687 dev_uc_del(lowerdev, dev->dev_addr);
688
689 hash_del:
690 macvlan_hash_del(vlan, !dev->dismantle);
691 return 0;
692 }
693
694 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
695 {
696 struct macvlan_dev *vlan = netdev_priv(dev);
697 struct net_device *lowerdev = vlan->lowerdev;
698 struct macvlan_port *port = vlan->port;
699 int err;
700
701 if (!(dev->flags & IFF_UP)) {
702 /* Just copy in the new address */
703 ether_addr_copy(dev->dev_addr, addr);
704 } else {
705 /* Rehash and update the device filters */
706 if (macvlan_addr_busy(vlan->port, addr))
707 return -EADDRINUSE;
708
709 if (!macvlan_passthru(port)) {
710 err = dev_uc_add(lowerdev, addr);
711 if (err)
712 return err;
713
714 dev_uc_del(lowerdev, dev->dev_addr);
715 }
716
717 macvlan_hash_change_addr(vlan, addr);
718 }
719 if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
720 /* Since addr_change isn't set, we are here due to lower
721 * device change. Save the lower-dev address so we can
722 * restore it later.
723 */
724 ether_addr_copy(vlan->port->perm_addr,
725 lowerdev->dev_addr);
726 }
727 macvlan_clear_addr_change(port);
728 return 0;
729 }
730
731 static int macvlan_set_mac_address(struct net_device *dev, void *p)
732 {
733 struct macvlan_dev *vlan = netdev_priv(dev);
734 struct sockaddr *addr = p;
735
736 if (!is_valid_ether_addr(addr->sa_data))
737 return -EADDRNOTAVAIL;
738
739 /* If the addresses are the same, this is a no-op */
740 if (ether_addr_equal(dev->dev_addr, addr->sa_data))
741 return 0;
742
743 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
744 macvlan_set_addr_change(vlan->port);
745 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
746 }
747
748 if (macvlan_addr_busy(vlan->port, addr->sa_data))
749 return -EADDRINUSE;
750
751 return macvlan_sync_address(dev, addr->sa_data);
752 }
753
754 static void macvlan_change_rx_flags(struct net_device *dev, int change)
755 {
756 struct macvlan_dev *vlan = netdev_priv(dev);
757 struct net_device *lowerdev = vlan->lowerdev;
758
759 if (dev->flags & IFF_UP) {
760 if (change & IFF_ALLMULTI)
761 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
762 if (change & IFF_PROMISC)
763 dev_set_promiscuity(lowerdev,
764 dev->flags & IFF_PROMISC ? 1 : -1);
765
766 }
767 }
768
769 static void macvlan_compute_filter(unsigned long *mc_filter,
770 struct net_device *dev,
771 struct macvlan_dev *vlan)
772 {
773 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
774 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
775 } else {
776 struct netdev_hw_addr *ha;
777 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
778
779 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
780 netdev_for_each_mc_addr(ha, dev) {
781 __set_bit(mc_hash(vlan, ha->addr), filter);
782 }
783
784 __set_bit(mc_hash(vlan, dev->broadcast), filter);
785
786 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
787 }
788 }
789
790 static void macvlan_set_mac_lists(struct net_device *dev)
791 {
792 struct macvlan_dev *vlan = netdev_priv(dev);
793
794 macvlan_compute_filter(vlan->mc_filter, dev, vlan);
795
796 dev_uc_sync(vlan->lowerdev, dev);
797 dev_mc_sync(vlan->lowerdev, dev);
798
799 /* This is slightly inaccurate as we're including the subscription
800 * list of vlan->lowerdev too.
801 *
802 * Bug alert: This only works if everyone has the same broadcast
803 * address as lowerdev. As soon as someone changes theirs this
804 * will break.
805 *
806 * However, this is already broken as when you change your broadcast
807 * address we don't get called.
808 *
809 * The solution is to maintain a list of broadcast addresses like
810 * we do for uc/mc, if you care.
811 */
812 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
813 }
814
815 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
816 {
817 struct macvlan_dev *vlan = netdev_priv(dev);
818
819 if (vlan->lowerdev->mtu < new_mtu)
820 return -EINVAL;
821 dev->mtu = new_mtu;
822 return 0;
823 }
824
825 static int macvlan_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
826 {
827 struct net_device *real_dev = macvlan_dev_real_dev(dev);
828 const struct net_device_ops *ops = real_dev->netdev_ops;
829 struct ifreq ifrr;
830 int err = -EOPNOTSUPP;
831
832 strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
833 ifrr.ifr_ifru = ifr->ifr_ifru;
834
835 switch (cmd) {
836 case SIOCSHWTSTAMP:
837 if (!net_eq(dev_net(dev), &init_net))
838 break;
839 /* fall through */
840 case SIOCGHWTSTAMP:
841 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
842 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
843 break;
844 }
845
846 if (!err)
847 ifr->ifr_ifru = ifrr.ifr_ifru;
848
849 return err;
850 }
851
852 /*
853 * macvlan network devices have devices nesting below it and are a special
854 * "super class" of normal network devices; split their locks off into a
855 * separate class since they always nest.
856 */
857 #define ALWAYS_ON_OFFLOADS \
858 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
859 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
860
861 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
862
863 #define MACVLAN_FEATURES \
864 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
865 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
866 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
867 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
868
869 #define MACVLAN_STATE_MASK \
870 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
871
872 static int macvlan_init(struct net_device *dev)
873 {
874 struct macvlan_dev *vlan = netdev_priv(dev);
875 const struct net_device *lowerdev = vlan->lowerdev;
876 struct macvlan_port *port = vlan->port;
877
878 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
879 (lowerdev->state & MACVLAN_STATE_MASK);
880 dev->features = lowerdev->features & MACVLAN_FEATURES;
881 dev->features |= ALWAYS_ON_FEATURES;
882 dev->hw_features |= NETIF_F_LRO;
883 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
884 dev->vlan_features |= ALWAYS_ON_OFFLOADS;
885 dev->hw_enc_features |= dev->features;
886 dev->gso_max_size = lowerdev->gso_max_size;
887 dev->gso_max_segs = lowerdev->gso_max_segs;
888 dev->hard_header_len = lowerdev->hard_header_len;
889
890 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
891 if (!vlan->pcpu_stats)
892 return -ENOMEM;
893
894 port->count += 1;
895
896 return 0;
897 }
898
899 static void macvlan_uninit(struct net_device *dev)
900 {
901 struct macvlan_dev *vlan = netdev_priv(dev);
902 struct macvlan_port *port = vlan->port;
903
904 free_percpu(vlan->pcpu_stats);
905
906 macvlan_flush_sources(port, vlan);
907 port->count -= 1;
908 if (!port->count)
909 macvlan_port_destroy(port->dev);
910 }
911
912 static void macvlan_dev_get_stats64(struct net_device *dev,
913 struct rtnl_link_stats64 *stats)
914 {
915 struct macvlan_dev *vlan = netdev_priv(dev);
916
917 if (vlan->pcpu_stats) {
918 struct vlan_pcpu_stats *p;
919 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
920 u32 rx_errors = 0, tx_dropped = 0;
921 unsigned int start;
922 int i;
923
924 for_each_possible_cpu(i) {
925 p = per_cpu_ptr(vlan->pcpu_stats, i);
926 do {
927 start = u64_stats_fetch_begin_irq(&p->syncp);
928 rx_packets = p->rx_packets;
929 rx_bytes = p->rx_bytes;
930 rx_multicast = p->rx_multicast;
931 tx_packets = p->tx_packets;
932 tx_bytes = p->tx_bytes;
933 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
934
935 stats->rx_packets += rx_packets;
936 stats->rx_bytes += rx_bytes;
937 stats->multicast += rx_multicast;
938 stats->tx_packets += tx_packets;
939 stats->tx_bytes += tx_bytes;
940 /* rx_errors & tx_dropped are u32, updated
941 * without syncp protection.
942 */
943 rx_errors += p->rx_errors;
944 tx_dropped += p->tx_dropped;
945 }
946 stats->rx_errors = rx_errors;
947 stats->rx_dropped = rx_errors;
948 stats->tx_dropped = tx_dropped;
949 }
950 }
951
952 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
953 __be16 proto, u16 vid)
954 {
955 struct macvlan_dev *vlan = netdev_priv(dev);
956 struct net_device *lowerdev = vlan->lowerdev;
957
958 return vlan_vid_add(lowerdev, proto, vid);
959 }
960
961 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
962 __be16 proto, u16 vid)
963 {
964 struct macvlan_dev *vlan = netdev_priv(dev);
965 struct net_device *lowerdev = vlan->lowerdev;
966
967 vlan_vid_del(lowerdev, proto, vid);
968 return 0;
969 }
970
971 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
972 struct net_device *dev,
973 const unsigned char *addr, u16 vid,
974 u16 flags,
975 struct netlink_ext_ack *extack)
976 {
977 struct macvlan_dev *vlan = netdev_priv(dev);
978 int err = -EINVAL;
979
980 /* Support unicast filter only on passthru devices.
981 * Multicast filter should be allowed on all devices.
982 */
983 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
984 return -EOPNOTSUPP;
985
986 if (flags & NLM_F_REPLACE)
987 return -EOPNOTSUPP;
988
989 if (is_unicast_ether_addr(addr))
990 err = dev_uc_add_excl(dev, addr);
991 else if (is_multicast_ether_addr(addr))
992 err = dev_mc_add_excl(dev, addr);
993
994 return err;
995 }
996
997 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
998 struct net_device *dev,
999 const unsigned char *addr, u16 vid)
1000 {
1001 struct macvlan_dev *vlan = netdev_priv(dev);
1002 int err = -EINVAL;
1003
1004 /* Support unicast filter only on passthru devices.
1005 * Multicast filter should be allowed on all devices.
1006 */
1007 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1008 return -EOPNOTSUPP;
1009
1010 if (is_unicast_ether_addr(addr))
1011 err = dev_uc_del(dev, addr);
1012 else if (is_multicast_ether_addr(addr))
1013 err = dev_mc_del(dev, addr);
1014
1015 return err;
1016 }
1017
1018 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1019 struct ethtool_drvinfo *drvinfo)
1020 {
1021 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1022 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1023 }
1024
1025 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1026 struct ethtool_link_ksettings *cmd)
1027 {
1028 const struct macvlan_dev *vlan = netdev_priv(dev);
1029
1030 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1031 }
1032
1033 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1034 struct ethtool_ts_info *info)
1035 {
1036 struct net_device *real_dev = macvlan_dev_real_dev(dev);
1037 const struct ethtool_ops *ops = real_dev->ethtool_ops;
1038 struct phy_device *phydev = real_dev->phydev;
1039
1040 if (phy_has_tsinfo(phydev)) {
1041 return phy_ts_info(phydev, info);
1042 } else if (ops->get_ts_info) {
1043 return ops->get_ts_info(real_dev, info);
1044 } else {
1045 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1046 SOF_TIMESTAMPING_SOFTWARE;
1047 info->phc_index = -1;
1048 }
1049
1050 return 0;
1051 }
1052
1053 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1054 netdev_features_t features)
1055 {
1056 struct macvlan_dev *vlan = netdev_priv(dev);
1057 netdev_features_t lowerdev_features = vlan->lowerdev->features;
1058 netdev_features_t mask;
1059
1060 features |= NETIF_F_ALL_FOR_ALL;
1061 features &= (vlan->set_features | ~MACVLAN_FEATURES);
1062 mask = features;
1063
1064 lowerdev_features &= (features | ~NETIF_F_LRO);
1065 features = netdev_increment_features(lowerdev_features, features, mask);
1066 features |= ALWAYS_ON_FEATURES;
1067 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1068
1069 return features;
1070 }
1071
1072 #ifdef CONFIG_NET_POLL_CONTROLLER
1073 static void macvlan_dev_poll_controller(struct net_device *dev)
1074 {
1075 return;
1076 }
1077
1078 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1079 {
1080 struct macvlan_dev *vlan = netdev_priv(dev);
1081 struct net_device *real_dev = vlan->lowerdev;
1082 struct netpoll *netpoll;
1083 int err = 0;
1084
1085 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1086 err = -ENOMEM;
1087 if (!netpoll)
1088 goto out;
1089
1090 err = __netpoll_setup(netpoll, real_dev);
1091 if (err) {
1092 kfree(netpoll);
1093 goto out;
1094 }
1095
1096 vlan->netpoll = netpoll;
1097
1098 out:
1099 return err;
1100 }
1101
1102 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1103 {
1104 struct macvlan_dev *vlan = netdev_priv(dev);
1105 struct netpoll *netpoll = vlan->netpoll;
1106
1107 if (!netpoll)
1108 return;
1109
1110 vlan->netpoll = NULL;
1111
1112 __netpoll_free(netpoll);
1113 }
1114 #endif /* CONFIG_NET_POLL_CONTROLLER */
1115
1116 static int macvlan_dev_get_iflink(const struct net_device *dev)
1117 {
1118 struct macvlan_dev *vlan = netdev_priv(dev);
1119
1120 return vlan->lowerdev->ifindex;
1121 }
1122
1123 static const struct ethtool_ops macvlan_ethtool_ops = {
1124 .get_link = ethtool_op_get_link,
1125 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1126 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1127 .get_ts_info = macvlan_ethtool_get_ts_info,
1128 };
1129
1130 static const struct net_device_ops macvlan_netdev_ops = {
1131 .ndo_init = macvlan_init,
1132 .ndo_uninit = macvlan_uninit,
1133 .ndo_open = macvlan_open,
1134 .ndo_stop = macvlan_stop,
1135 .ndo_start_xmit = macvlan_start_xmit,
1136 .ndo_change_mtu = macvlan_change_mtu,
1137 .ndo_do_ioctl = macvlan_do_ioctl,
1138 .ndo_fix_features = macvlan_fix_features,
1139 .ndo_change_rx_flags = macvlan_change_rx_flags,
1140 .ndo_set_mac_address = macvlan_set_mac_address,
1141 .ndo_set_rx_mode = macvlan_set_mac_lists,
1142 .ndo_get_stats64 = macvlan_dev_get_stats64,
1143 .ndo_validate_addr = eth_validate_addr,
1144 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1145 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1146 .ndo_fdb_add = macvlan_fdb_add,
1147 .ndo_fdb_del = macvlan_fdb_del,
1148 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1149 #ifdef CONFIG_NET_POLL_CONTROLLER
1150 .ndo_poll_controller = macvlan_dev_poll_controller,
1151 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1152 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1153 #endif
1154 .ndo_get_iflink = macvlan_dev_get_iflink,
1155 .ndo_features_check = passthru_features_check,
1156 .ndo_change_proto_down = dev_change_proto_down_generic,
1157 };
1158
1159 void macvlan_common_setup(struct net_device *dev)
1160 {
1161 ether_setup(dev);
1162
1163 dev->min_mtu = 0;
1164 dev->max_mtu = ETH_MAX_MTU;
1165 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1166 netif_keep_dst(dev);
1167 dev->priv_flags |= IFF_UNICAST_FLT;
1168 dev->netdev_ops = &macvlan_netdev_ops;
1169 dev->needs_free_netdev = true;
1170 dev->header_ops = &macvlan_hard_header_ops;
1171 dev->ethtool_ops = &macvlan_ethtool_ops;
1172 }
1173 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1174
1175 static void macvlan_setup(struct net_device *dev)
1176 {
1177 macvlan_common_setup(dev);
1178 dev->priv_flags |= IFF_NO_QUEUE;
1179 }
1180
1181 static int macvlan_port_create(struct net_device *dev)
1182 {
1183 struct macvlan_port *port;
1184 unsigned int i;
1185 int err;
1186
1187 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1188 return -EINVAL;
1189
1190 if (netdev_is_rx_handler_busy(dev))
1191 return -EBUSY;
1192
1193 port = kzalloc(sizeof(*port), GFP_KERNEL);
1194 if (port == NULL)
1195 return -ENOMEM;
1196
1197 port->dev = dev;
1198 ether_addr_copy(port->perm_addr, dev->dev_addr);
1199 INIT_LIST_HEAD(&port->vlans);
1200 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1201 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1202 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1203 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1204
1205 skb_queue_head_init(&port->bc_queue);
1206 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1207
1208 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1209 if (err)
1210 kfree(port);
1211 else
1212 dev->priv_flags |= IFF_MACVLAN_PORT;
1213 return err;
1214 }
1215
1216 static void macvlan_port_destroy(struct net_device *dev)
1217 {
1218 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1219 struct sk_buff *skb;
1220
1221 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1222 netdev_rx_handler_unregister(dev);
1223
1224 /* After this point, no packet can schedule bc_work anymore,
1225 * but we need to cancel it and purge left skbs if any.
1226 */
1227 cancel_work_sync(&port->bc_work);
1228
1229 while ((skb = __skb_dequeue(&port->bc_queue))) {
1230 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1231
1232 if (src)
1233 dev_put(src->dev);
1234
1235 kfree_skb(skb);
1236 }
1237
1238 /* If the lower device address has been changed by passthru
1239 * macvlan, put it back.
1240 */
1241 if (macvlan_passthru(port) &&
1242 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1243 struct sockaddr sa;
1244
1245 sa.sa_family = port->dev->type;
1246 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1247 dev_set_mac_address(port->dev, &sa, NULL);
1248 }
1249
1250 kfree(port);
1251 }
1252
1253 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1254 struct netlink_ext_ack *extack)
1255 {
1256 if (tb[IFLA_ADDRESS]) {
1257 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1258 return -EINVAL;
1259 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1260 return -EADDRNOTAVAIL;
1261 }
1262
1263 if (!data)
1264 return 0;
1265
1266 if (data[IFLA_MACVLAN_FLAGS] &&
1267 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1268 return -EINVAL;
1269
1270 if (data[IFLA_MACVLAN_MODE]) {
1271 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1272 case MACVLAN_MODE_PRIVATE:
1273 case MACVLAN_MODE_VEPA:
1274 case MACVLAN_MODE_BRIDGE:
1275 case MACVLAN_MODE_PASSTHRU:
1276 case MACVLAN_MODE_SOURCE:
1277 break;
1278 default:
1279 return -EINVAL;
1280 }
1281 }
1282
1283 if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1284 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1285 case MACVLAN_MACADDR_ADD:
1286 case MACVLAN_MACADDR_DEL:
1287 case MACVLAN_MACADDR_FLUSH:
1288 case MACVLAN_MACADDR_SET:
1289 break;
1290 default:
1291 return -EINVAL;
1292 }
1293 }
1294
1295 if (data[IFLA_MACVLAN_MACADDR]) {
1296 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1297 return -EINVAL;
1298
1299 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1300 return -EADDRNOTAVAIL;
1301 }
1302
1303 if (data[IFLA_MACVLAN_MACADDR_COUNT])
1304 return -EINVAL;
1305
1306 return 0;
1307 }
1308
1309 /**
1310 * reconfigure list of remote source mac address
1311 * (only for macvlan devices in source mode)
1312 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1313 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1314 */
1315 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1316 struct nlattr *data[])
1317 {
1318 char *addr = NULL;
1319 int ret, rem, len;
1320 struct nlattr *nla, *head;
1321 struct macvlan_source_entry *entry;
1322
1323 if (data[IFLA_MACVLAN_MACADDR])
1324 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1325
1326 if (mode == MACVLAN_MACADDR_ADD) {
1327 if (!addr)
1328 return -EINVAL;
1329
1330 return macvlan_hash_add_source(vlan, addr);
1331
1332 } else if (mode == MACVLAN_MACADDR_DEL) {
1333 if (!addr)
1334 return -EINVAL;
1335
1336 entry = macvlan_hash_lookup_source(vlan, addr);
1337 if (entry) {
1338 macvlan_hash_del_source(entry);
1339 vlan->macaddr_count--;
1340 }
1341 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1342 macvlan_flush_sources(vlan->port, vlan);
1343 } else if (mode == MACVLAN_MACADDR_SET) {
1344 macvlan_flush_sources(vlan->port, vlan);
1345
1346 if (addr) {
1347 ret = macvlan_hash_add_source(vlan, addr);
1348 if (ret)
1349 return ret;
1350 }
1351
1352 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1353 return 0;
1354
1355 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1356 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1357
1358 nla_for_each_attr(nla, head, len, rem) {
1359 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1360 nla_len(nla) != ETH_ALEN)
1361 continue;
1362
1363 addr = nla_data(nla);
1364 ret = macvlan_hash_add_source(vlan, addr);
1365 if (ret)
1366 return ret;
1367 }
1368 } else {
1369 return -EINVAL;
1370 }
1371
1372 return 0;
1373 }
1374
1375 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1376 struct nlattr *tb[], struct nlattr *data[],
1377 struct netlink_ext_ack *extack)
1378 {
1379 struct macvlan_dev *vlan = netdev_priv(dev);
1380 struct macvlan_port *port;
1381 struct net_device *lowerdev;
1382 int err;
1383 int macmode;
1384 bool create = false;
1385
1386 if (!tb[IFLA_LINK])
1387 return -EINVAL;
1388
1389 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1390 if (lowerdev == NULL)
1391 return -ENODEV;
1392
1393 /* When creating macvlans or macvtaps on top of other macvlans - use
1394 * the real device as the lowerdev.
1395 */
1396 if (netif_is_macvlan(lowerdev))
1397 lowerdev = macvlan_dev_real_dev(lowerdev);
1398
1399 if (!tb[IFLA_MTU])
1400 dev->mtu = lowerdev->mtu;
1401 else if (dev->mtu > lowerdev->mtu)
1402 return -EINVAL;
1403
1404 /* MTU range: 68 - lowerdev->max_mtu */
1405 dev->min_mtu = ETH_MIN_MTU;
1406 dev->max_mtu = lowerdev->max_mtu;
1407
1408 if (!tb[IFLA_ADDRESS])
1409 eth_hw_addr_random(dev);
1410
1411 if (!netif_is_macvlan_port(lowerdev)) {
1412 err = macvlan_port_create(lowerdev);
1413 if (err < 0)
1414 return err;
1415 create = true;
1416 }
1417 port = macvlan_port_get_rtnl(lowerdev);
1418
1419 /* Only 1 macvlan device can be created in passthru mode */
1420 if (macvlan_passthru(port)) {
1421 /* The macvlan port must be not created this time,
1422 * still goto destroy_macvlan_port for readability.
1423 */
1424 err = -EINVAL;
1425 goto destroy_macvlan_port;
1426 }
1427
1428 vlan->lowerdev = lowerdev;
1429 vlan->dev = dev;
1430 vlan->port = port;
1431 vlan->set_features = MACVLAN_FEATURES;
1432
1433 vlan->mode = MACVLAN_MODE_VEPA;
1434 if (data && data[IFLA_MACVLAN_MODE])
1435 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1436
1437 if (data && data[IFLA_MACVLAN_FLAGS])
1438 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1439
1440 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1441 if (port->count) {
1442 err = -EINVAL;
1443 goto destroy_macvlan_port;
1444 }
1445 macvlan_set_passthru(port);
1446 eth_hw_addr_inherit(dev, lowerdev);
1447 }
1448
1449 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1450 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1451 err = -EINVAL;
1452 goto destroy_macvlan_port;
1453 }
1454 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1455 err = macvlan_changelink_sources(vlan, macmode, data);
1456 if (err)
1457 goto destroy_macvlan_port;
1458 }
1459
1460 err = register_netdevice(dev);
1461 if (err < 0)
1462 goto destroy_macvlan_port;
1463
1464 dev->priv_flags |= IFF_MACVLAN;
1465 err = netdev_upper_dev_link(lowerdev, dev, extack);
1466 if (err)
1467 goto unregister_netdev;
1468
1469 list_add_tail_rcu(&vlan->list, &port->vlans);
1470 netif_stacked_transfer_operstate(lowerdev, dev);
1471 linkwatch_fire_event(dev);
1472
1473 return 0;
1474
1475 unregister_netdev:
1476 /* macvlan_uninit would free the macvlan port */
1477 unregister_netdevice(dev);
1478 return err;
1479 destroy_macvlan_port:
1480 /* the macvlan port may be freed by macvlan_uninit when fail to register.
1481 * so we destroy the macvlan port only when it's valid.
1482 */
1483 if (create && macvlan_port_get_rtnl(lowerdev))
1484 macvlan_port_destroy(port->dev);
1485 return err;
1486 }
1487 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1488
1489 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1490 struct nlattr *tb[], struct nlattr *data[],
1491 struct netlink_ext_ack *extack)
1492 {
1493 return macvlan_common_newlink(src_net, dev, tb, data, extack);
1494 }
1495
1496 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1497 {
1498 struct macvlan_dev *vlan = netdev_priv(dev);
1499
1500 if (vlan->mode == MACVLAN_MODE_SOURCE)
1501 macvlan_flush_sources(vlan->port, vlan);
1502 list_del_rcu(&vlan->list);
1503 unregister_netdevice_queue(dev, head);
1504 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1505 }
1506 EXPORT_SYMBOL_GPL(macvlan_dellink);
1507
1508 static int macvlan_changelink(struct net_device *dev,
1509 struct nlattr *tb[], struct nlattr *data[],
1510 struct netlink_ext_ack *extack)
1511 {
1512 struct macvlan_dev *vlan = netdev_priv(dev);
1513 enum macvlan_mode mode;
1514 bool set_mode = false;
1515 enum macvlan_macaddr_mode macmode;
1516 int ret;
1517
1518 /* Validate mode, but don't set yet: setting flags may fail. */
1519 if (data && data[IFLA_MACVLAN_MODE]) {
1520 set_mode = true;
1521 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1522 /* Passthrough mode can't be set or cleared dynamically */
1523 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1524 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1525 return -EINVAL;
1526 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1527 vlan->mode != mode)
1528 macvlan_flush_sources(vlan->port, vlan);
1529 }
1530
1531 if (data && data[IFLA_MACVLAN_FLAGS]) {
1532 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1533 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1534 if (macvlan_passthru(vlan->port) && promisc) {
1535 int err;
1536
1537 if (flags & MACVLAN_FLAG_NOPROMISC)
1538 err = dev_set_promiscuity(vlan->lowerdev, -1);
1539 else
1540 err = dev_set_promiscuity(vlan->lowerdev, 1);
1541 if (err < 0)
1542 return err;
1543 }
1544 vlan->flags = flags;
1545 }
1546 if (set_mode)
1547 vlan->mode = mode;
1548 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1549 if (vlan->mode != MACVLAN_MODE_SOURCE)
1550 return -EINVAL;
1551 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1552 ret = macvlan_changelink_sources(vlan, macmode, data);
1553 if (ret)
1554 return ret;
1555 }
1556 return 0;
1557 }
1558
1559 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1560 {
1561 if (vlan->macaddr_count == 0)
1562 return 0;
1563 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1564 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1565 }
1566
1567 static size_t macvlan_get_size(const struct net_device *dev)
1568 {
1569 struct macvlan_dev *vlan = netdev_priv(dev);
1570
1571 return (0
1572 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1573 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1574 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1575 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1576 );
1577 }
1578
1579 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1580 const struct macvlan_dev *vlan,
1581 const int i)
1582 {
1583 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1584 struct macvlan_source_entry *entry;
1585
1586 hlist_for_each_entry_rcu(entry, h, hlist) {
1587 if (entry->vlan != vlan)
1588 continue;
1589 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1590 return 1;
1591 }
1592 return 0;
1593 }
1594
1595 static int macvlan_fill_info(struct sk_buff *skb,
1596 const struct net_device *dev)
1597 {
1598 struct macvlan_dev *vlan = netdev_priv(dev);
1599 int i;
1600 struct nlattr *nest;
1601
1602 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1603 goto nla_put_failure;
1604 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1605 goto nla_put_failure;
1606 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1607 goto nla_put_failure;
1608 if (vlan->macaddr_count > 0) {
1609 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1610 if (nest == NULL)
1611 goto nla_put_failure;
1612
1613 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1614 if (macvlan_fill_info_macaddr(skb, vlan, i))
1615 goto nla_put_failure;
1616 }
1617 nla_nest_end(skb, nest);
1618 }
1619 return 0;
1620
1621 nla_put_failure:
1622 return -EMSGSIZE;
1623 }
1624
1625 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1626 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1627 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1628 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1629 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1630 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1631 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1632 };
1633
1634 int macvlan_link_register(struct rtnl_link_ops *ops)
1635 {
1636 /* common fields */
1637 ops->validate = macvlan_validate;
1638 ops->maxtype = IFLA_MACVLAN_MAX;
1639 ops->policy = macvlan_policy;
1640 ops->changelink = macvlan_changelink;
1641 ops->get_size = macvlan_get_size;
1642 ops->fill_info = macvlan_fill_info;
1643
1644 return rtnl_link_register(ops);
1645 };
1646 EXPORT_SYMBOL_GPL(macvlan_link_register);
1647
1648 static struct net *macvlan_get_link_net(const struct net_device *dev)
1649 {
1650 return dev_net(macvlan_dev_real_dev(dev));
1651 }
1652
1653 static struct rtnl_link_ops macvlan_link_ops = {
1654 .kind = "macvlan",
1655 .setup = macvlan_setup,
1656 .newlink = macvlan_newlink,
1657 .dellink = macvlan_dellink,
1658 .get_link_net = macvlan_get_link_net,
1659 .priv_size = sizeof(struct macvlan_dev),
1660 };
1661
1662 static int macvlan_device_event(struct notifier_block *unused,
1663 unsigned long event, void *ptr)
1664 {
1665 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1666 struct macvlan_dev *vlan, *next;
1667 struct macvlan_port *port;
1668 LIST_HEAD(list_kill);
1669
1670 if (!netif_is_macvlan_port(dev))
1671 return NOTIFY_DONE;
1672
1673 port = macvlan_port_get_rtnl(dev);
1674
1675 switch (event) {
1676 case NETDEV_UP:
1677 case NETDEV_DOWN:
1678 case NETDEV_CHANGE:
1679 list_for_each_entry(vlan, &port->vlans, list)
1680 netif_stacked_transfer_operstate(vlan->lowerdev,
1681 vlan->dev);
1682 break;
1683 case NETDEV_FEAT_CHANGE:
1684 list_for_each_entry(vlan, &port->vlans, list) {
1685 vlan->dev->gso_max_size = dev->gso_max_size;
1686 vlan->dev->gso_max_segs = dev->gso_max_segs;
1687 netdev_update_features(vlan->dev);
1688 }
1689 break;
1690 case NETDEV_CHANGEMTU:
1691 list_for_each_entry(vlan, &port->vlans, list) {
1692 if (vlan->dev->mtu <= dev->mtu)
1693 continue;
1694 dev_set_mtu(vlan->dev, dev->mtu);
1695 }
1696 break;
1697 case NETDEV_CHANGEADDR:
1698 if (!macvlan_passthru(port))
1699 return NOTIFY_DONE;
1700
1701 vlan = list_first_entry_or_null(&port->vlans,
1702 struct macvlan_dev,
1703 list);
1704
1705 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1706 return NOTIFY_BAD;
1707
1708 break;
1709 case NETDEV_UNREGISTER:
1710 /* twiddle thumbs on netns device moves */
1711 if (dev->reg_state != NETREG_UNREGISTERING)
1712 break;
1713
1714 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1715 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1716 unregister_netdevice_many(&list_kill);
1717 break;
1718 case NETDEV_PRE_TYPE_CHANGE:
1719 /* Forbid underlaying device to change its type. */
1720 return NOTIFY_BAD;
1721
1722 case NETDEV_NOTIFY_PEERS:
1723 case NETDEV_BONDING_FAILOVER:
1724 case NETDEV_RESEND_IGMP:
1725 /* Propagate to all vlans */
1726 list_for_each_entry(vlan, &port->vlans, list)
1727 call_netdevice_notifiers(event, vlan->dev);
1728 }
1729 return NOTIFY_DONE;
1730 }
1731
1732 static struct notifier_block macvlan_notifier_block __read_mostly = {
1733 .notifier_call = macvlan_device_event,
1734 };
1735
1736 static int __init macvlan_init_module(void)
1737 {
1738 int err;
1739
1740 register_netdevice_notifier(&macvlan_notifier_block);
1741
1742 err = macvlan_link_register(&macvlan_link_ops);
1743 if (err < 0)
1744 goto err1;
1745 return 0;
1746 err1:
1747 unregister_netdevice_notifier(&macvlan_notifier_block);
1748 return err;
1749 }
1750
1751 static void __exit macvlan_cleanup_module(void)
1752 {
1753 rtnl_link_unregister(&macvlan_link_ops);
1754 unregister_netdevice_notifier(&macvlan_notifier_block);
1755 }
1756
1757 module_init(macvlan_init_module);
1758 module_exit(macvlan_cleanup_module);
1759
1760 MODULE_LICENSE("GPL");
1761 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1762 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1763 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux with added FPC-III support