]> git.proxmox.com Git - mirror_ubuntu-hirsute-kernel.git/blob - drivers/net/macvlan.c
projects / mirror_ubuntu-hirsute-kernel.git / blob
? search:


0354e9be2ca57ecfbc0aafb948b2ff620aa8e69a
[mirror_ubuntu-hirsute-kernel.git] / drivers / net / macvlan.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
4 *
5 * The code this is based on carried the following copyright notice:
6 * ---
7 * (C) Copyright 2001-2006
8 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
9 * Re-worked by Ben Greear <greearb@candelatech.com>
10 * ---
11 */
12 #include <linux/kernel.h>
13 #include <linux/types.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/string.h>
19 #include <linux/rculist.h>
20 #include <linux/notifier.h>
21 #include <linux/netdevice.h>
22 #include <linux/etherdevice.h>
23 #include <linux/net_tstamp.h>
24 #include <linux/ethtool.h>
25 #include <linux/if_arp.h>
26 #include <linux/if_vlan.h>
27 #include <linux/if_link.h>
28 #include <linux/if_macvlan.h>
29 #include <linux/hash.h>
30 #include <linux/workqueue.h>
31 #include <net/rtnetlink.h>
32 #include <net/xfrm.h>
33 #include <linux/netpoll.h>
34 #include <linux/phy.h>
35
36 #define MACVLAN_HASH_BITS 8
37 #define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS)
38 #define MACVLAN_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 if (err)
363 goto free_nskb;
364
365 schedule_work(&port->bc_work);
366 return;
367
368 free_nskb:
369 kfree_skb(nskb);
370 err:
371 atomic_long_inc(&skb->dev->rx_dropped);
372 }
373
374 static void macvlan_flush_sources(struct macvlan_port *port,
375 struct macvlan_dev *vlan)
376 {
377 int i;
378
379 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
380 struct hlist_node *h, *n;
381
382 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
383 struct macvlan_source_entry *entry;
384
385 entry = hlist_entry(h, struct macvlan_source_entry,
386 hlist);
387 if (entry->vlan == vlan)
388 macvlan_hash_del_source(entry);
389 }
390 }
391 vlan->macaddr_count = 0;
392 }
393
394 static void macvlan_forward_source_one(struct sk_buff *skb,
395 struct macvlan_dev *vlan)
396 {
397 struct sk_buff *nskb;
398 struct net_device *dev;
399 int len;
400 int ret;
401
402 dev = vlan->dev;
403 if (unlikely(!(dev->flags & IFF_UP)))
404 return;
405
406 nskb = skb_clone(skb, GFP_ATOMIC);
407 if (!nskb)
408 return;
409
410 len = nskb->len + ETH_HLEN;
411 nskb->dev = dev;
412
413 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
414 nskb->pkt_type = PACKET_HOST;
415
416 ret = netif_rx(nskb);
417 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
418 }
419
420 static void macvlan_forward_source(struct sk_buff *skb,
421 struct macvlan_port *port,
422 const unsigned char *addr)
423 {
424 struct macvlan_source_entry *entry;
425 u32 idx = macvlan_eth_hash(addr);
426 struct hlist_head *h = &port->vlan_source_hash[idx];
427
428 hlist_for_each_entry_rcu(entry, h, hlist) {
429 if (ether_addr_equal_64bits(entry->addr, addr))
430 macvlan_forward_source_one(skb, entry->vlan);
431 }
432 }
433
434 /* called under rcu_read_lock() from netif_receive_skb */
435 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
436 {
437 struct macvlan_port *port;
438 struct sk_buff *skb = *pskb;
439 const struct ethhdr *eth = eth_hdr(skb);
440 const struct macvlan_dev *vlan;
441 const struct macvlan_dev *src;
442 struct net_device *dev;
443 unsigned int len = 0;
444 int ret;
445 rx_handler_result_t handle_res;
446
447 port = macvlan_port_get_rcu(skb->dev);
448 if (is_multicast_ether_addr(eth->h_dest)) {
449 unsigned int hash;
450
451 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
452 if (!skb)
453 return RX_HANDLER_CONSUMED;
454 *pskb = skb;
455 eth = eth_hdr(skb);
456 macvlan_forward_source(skb, port, eth->h_source);
457 src = macvlan_hash_lookup(port, eth->h_source);
458 if (src && src->mode != MACVLAN_MODE_VEPA &&
459 src->mode != MACVLAN_MODE_BRIDGE) {
460 /* forward to original port. */
461 vlan = src;
462 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
463 netif_rx(skb);
464 handle_res = RX_HANDLER_CONSUMED;
465 goto out;
466 }
467
468 hash = mc_hash(NULL, eth->h_dest);
469 if (test_bit(hash, port->mc_filter))
470 macvlan_broadcast_enqueue(port, src, skb);
471
472 return RX_HANDLER_PASS;
473 }
474
475 macvlan_forward_source(skb, port, eth->h_source);
476 if (macvlan_passthru(port))
477 vlan = list_first_or_null_rcu(&port->vlans,
478 struct macvlan_dev, list);
479 else
480 vlan = macvlan_hash_lookup(port, eth->h_dest);
481 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
482 return RX_HANDLER_PASS;
483
484 dev = vlan->dev;
485 if (unlikely(!(dev->flags & IFF_UP))) {
486 kfree_skb(skb);
487 return RX_HANDLER_CONSUMED;
488 }
489 len = skb->len + ETH_HLEN;
490 skb = skb_share_check(skb, GFP_ATOMIC);
491 if (!skb) {
492 ret = NET_RX_DROP;
493 handle_res = RX_HANDLER_CONSUMED;
494 goto out;
495 }
496
497 *pskb = skb;
498 skb->dev = dev;
499 skb->pkt_type = PACKET_HOST;
500
501 ret = NET_RX_SUCCESS;
502 handle_res = RX_HANDLER_ANOTHER;
503 out:
504 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
505 return handle_res;
506 }
507
508 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
509 {
510 const struct macvlan_dev *vlan = netdev_priv(dev);
511 const struct macvlan_port *port = vlan->port;
512 const struct macvlan_dev *dest;
513
514 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
515 const struct ethhdr *eth = (void *)skb->data;
516
517 /* send to other bridge ports directly */
518 if (is_multicast_ether_addr(eth->h_dest)) {
519 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
520 goto xmit_world;
521 }
522
523 dest = macvlan_hash_lookup(port, eth->h_dest);
524 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
525 /* send to lowerdev first for its network taps */
526 dev_forward_skb(vlan->lowerdev, skb);
527
528 return NET_XMIT_SUCCESS;
529 }
530 }
531 xmit_world:
532 skb->dev = vlan->lowerdev;
533 return dev_queue_xmit_accel(skb,
534 netdev_get_sb_channel(dev) ? dev : NULL);
535 }
536
537 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
538 {
539 #ifdef CONFIG_NET_POLL_CONTROLLER
540 if (vlan->netpoll)
541 netpoll_send_skb(vlan->netpoll, skb);
542 #else
543 BUG();
544 #endif
545 return NETDEV_TX_OK;
546 }
547
548 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
549 struct net_device *dev)
550 {
551 struct macvlan_dev *vlan = netdev_priv(dev);
552 unsigned int len = skb->len;
553 int ret;
554
555 if (unlikely(netpoll_tx_running(dev)))
556 return macvlan_netpoll_send_skb(vlan, skb);
557
558 ret = macvlan_queue_xmit(skb, dev);
559
560 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
561 struct vlan_pcpu_stats *pcpu_stats;
562
563 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
564 u64_stats_update_begin(&pcpu_stats->syncp);
565 pcpu_stats->tx_packets++;
566 pcpu_stats->tx_bytes += len;
567 u64_stats_update_end(&pcpu_stats->syncp);
568 } else {
569 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
570 }
571 return ret;
572 }
573
574 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
575 unsigned short type, const void *daddr,
576 const void *saddr, unsigned len)
577 {
578 const struct macvlan_dev *vlan = netdev_priv(dev);
579 struct net_device *lowerdev = vlan->lowerdev;
580
581 return dev_hard_header(skb, lowerdev, type, daddr,
582 saddr ? : dev->dev_addr, len);
583 }
584
585 static const struct header_ops macvlan_hard_header_ops = {
586 .create = macvlan_hard_header,
587 .parse = eth_header_parse,
588 .cache = eth_header_cache,
589 .cache_update = eth_header_cache_update,
590 };
591
592 static int macvlan_open(struct net_device *dev)
593 {
594 struct macvlan_dev *vlan = netdev_priv(dev);
595 struct net_device *lowerdev = vlan->lowerdev;
596 int err;
597
598 if (macvlan_passthru(vlan->port)) {
599 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
600 err = dev_set_promiscuity(lowerdev, 1);
601 if (err < 0)
602 goto out;
603 }
604 goto hash_add;
605 }
606
607 err = -EADDRINUSE;
608 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
609 goto out;
610
611 /* Attempt to populate accel_priv which is used to offload the L2
612 * forwarding requests for unicast packets.
613 */
614 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
615 vlan->accel_priv =
616 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
617
618 /* If earlier attempt to offload failed, or accel_priv is not
619 * populated we must add the unicast address to the lower device.
620 */
621 if (IS_ERR_OR_NULL(vlan->accel_priv)) {
622 vlan->accel_priv = NULL;
623 err = dev_uc_add(lowerdev, dev->dev_addr);
624 if (err < 0)
625 goto out;
626 }
627
628 if (dev->flags & IFF_ALLMULTI) {
629 err = dev_set_allmulti(lowerdev, 1);
630 if (err < 0)
631 goto del_unicast;
632 }
633
634 if (dev->flags & IFF_PROMISC) {
635 err = dev_set_promiscuity(lowerdev, 1);
636 if (err < 0)
637 goto clear_multi;
638 }
639
640 hash_add:
641 macvlan_hash_add(vlan);
642 return 0;
643
644 clear_multi:
645 if (dev->flags & IFF_ALLMULTI)
646 dev_set_allmulti(lowerdev, -1);
647 del_unicast:
648 if (vlan->accel_priv) {
649 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
650 vlan->accel_priv);
651 vlan->accel_priv = NULL;
652 } else {
653 dev_uc_del(lowerdev, dev->dev_addr);
654 }
655 out:
656 return err;
657 }
658
659 static int macvlan_stop(struct net_device *dev)
660 {
661 struct macvlan_dev *vlan = netdev_priv(dev);
662 struct net_device *lowerdev = vlan->lowerdev;
663
664 if (vlan->accel_priv) {
665 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
666 vlan->accel_priv);
667 vlan->accel_priv = NULL;
668 }
669
670 dev_uc_unsync(lowerdev, dev);
671 dev_mc_unsync(lowerdev, dev);
672
673 if (macvlan_passthru(vlan->port)) {
674 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
675 dev_set_promiscuity(lowerdev, -1);
676 goto hash_del;
677 }
678
679 if (dev->flags & IFF_ALLMULTI)
680 dev_set_allmulti(lowerdev, -1);
681
682 if (dev->flags & IFF_PROMISC)
683 dev_set_promiscuity(lowerdev, -1);
684
685 dev_uc_del(lowerdev, dev->dev_addr);
686
687 hash_del:
688 macvlan_hash_del(vlan, !dev->dismantle);
689 return 0;
690 }
691
692 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
693 {
694 struct macvlan_dev *vlan = netdev_priv(dev);
695 struct net_device *lowerdev = vlan->lowerdev;
696 struct macvlan_port *port = vlan->port;
697 int err;
698
699 if (!(dev->flags & IFF_UP)) {
700 /* Just copy in the new address */
701 ether_addr_copy(dev->dev_addr, addr);
702 } else {
703 /* Rehash and update the device filters */
704 if (macvlan_addr_busy(vlan->port, addr))
705 return -EADDRINUSE;
706
707 if (!macvlan_passthru(port)) {
708 err = dev_uc_add(lowerdev, addr);
709 if (err)
710 return err;
711
712 dev_uc_del(lowerdev, dev->dev_addr);
713 }
714
715 macvlan_hash_change_addr(vlan, addr);
716 }
717 if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
718 /* Since addr_change isn't set, we are here due to lower
719 * device change. Save the lower-dev address so we can
720 * restore it later.
721 */
722 ether_addr_copy(vlan->port->perm_addr,
723 lowerdev->dev_addr);
724 }
725 macvlan_clear_addr_change(port);
726 return 0;
727 }
728
729 static int macvlan_set_mac_address(struct net_device *dev, void *p)
730 {
731 struct macvlan_dev *vlan = netdev_priv(dev);
732 struct sockaddr *addr = p;
733
734 if (!is_valid_ether_addr(addr->sa_data))
735 return -EADDRNOTAVAIL;
736
737 /* If the addresses are the same, this is a no-op */
738 if (ether_addr_equal(dev->dev_addr, addr->sa_data))
739 return 0;
740
741 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
742 macvlan_set_addr_change(vlan->port);
743 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
744 }
745
746 if (macvlan_addr_busy(vlan->port, addr->sa_data))
747 return -EADDRINUSE;
748
749 return macvlan_sync_address(dev, addr->sa_data);
750 }
751
752 static void macvlan_change_rx_flags(struct net_device *dev, int change)
753 {
754 struct macvlan_dev *vlan = netdev_priv(dev);
755 struct net_device *lowerdev = vlan->lowerdev;
756
757 if (dev->flags & IFF_UP) {
758 if (change & IFF_ALLMULTI)
759 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
760 if (change & IFF_PROMISC)
761 dev_set_promiscuity(lowerdev,
762 dev->flags & IFF_PROMISC ? 1 : -1);
763
764 }
765 }
766
767 static void macvlan_compute_filter(unsigned long *mc_filter,
768 struct net_device *dev,
769 struct macvlan_dev *vlan)
770 {
771 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
772 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
773 } else {
774 struct netdev_hw_addr *ha;
775 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
776
777 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
778 netdev_for_each_mc_addr(ha, dev) {
779 __set_bit(mc_hash(vlan, ha->addr), filter);
780 }
781
782 __set_bit(mc_hash(vlan, dev->broadcast), filter);
783
784 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
785 }
786 }
787
788 static void macvlan_set_mac_lists(struct net_device *dev)
789 {
790 struct macvlan_dev *vlan = netdev_priv(dev);
791
792 macvlan_compute_filter(vlan->mc_filter, dev, vlan);
793
794 dev_uc_sync(vlan->lowerdev, dev);
795 dev_mc_sync(vlan->lowerdev, dev);
796
797 /* This is slightly inaccurate as we're including the subscription
798 * list of vlan->lowerdev too.
799 *
800 * Bug alert: This only works if everyone has the same broadcast
801 * address as lowerdev. As soon as someone changes theirs this
802 * will break.
803 *
804 * However, this is already broken as when you change your broadcast
805 * address we don't get called.
806 *
807 * The solution is to maintain a list of broadcast addresses like
808 * we do for uc/mc, if you care.
809 */
810 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
811 }
812
813 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
814 {
815 struct macvlan_dev *vlan = netdev_priv(dev);
816
817 if (vlan->lowerdev->mtu < new_mtu)
818 return -EINVAL;
819 dev->mtu = new_mtu;
820 return 0;
821 }
822
823 static int macvlan_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
824 {
825 struct net_device *real_dev = macvlan_dev_real_dev(dev);
826 const struct net_device_ops *ops = real_dev->netdev_ops;
827 struct ifreq ifrr;
828 int err = -EOPNOTSUPP;
829
830 strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
831 ifrr.ifr_ifru = ifr->ifr_ifru;
832
833 switch (cmd) {
834 case SIOCSHWTSTAMP:
835 if (!net_eq(dev_net(dev), &init_net))
836 break;
837 /* fall through */
838 case SIOCGHWTSTAMP:
839 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
840 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
841 break;
842 }
843
844 if (!err)
845 ifr->ifr_ifru = ifrr.ifr_ifru;
846
847 return err;
848 }
849
850 /*
851 * macvlan network devices have devices nesting below it and are a special
852 * "super class" of normal network devices; split their locks off into a
853 * separate class since they always nest.
854 */
855 #define ALWAYS_ON_OFFLOADS \
856 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
857 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
858
859 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
860
861 #define MACVLAN_FEATURES \
862 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
863 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
864 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
865 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
866
867 #define MACVLAN_STATE_MASK \
868 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
869
870 static int macvlan_get_nest_level(struct net_device *dev)
871 {
872 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
873 }
874
875 static int macvlan_init(struct net_device *dev)
876 {
877 struct macvlan_dev *vlan = netdev_priv(dev);
878 const struct net_device *lowerdev = vlan->lowerdev;
879 struct macvlan_port *port = vlan->port;
880
881 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
882 (lowerdev->state & MACVLAN_STATE_MASK);
883 dev->features = lowerdev->features & MACVLAN_FEATURES;
884 dev->features |= ALWAYS_ON_FEATURES;
885 dev->hw_features |= NETIF_F_LRO;
886 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
887 dev->vlan_features |= ALWAYS_ON_OFFLOADS;
888 dev->hw_enc_features |= dev->features;
889 dev->gso_max_size = lowerdev->gso_max_size;
890 dev->gso_max_segs = lowerdev->gso_max_segs;
891 dev->hard_header_len = lowerdev->hard_header_len;
892
893 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
894 if (!vlan->pcpu_stats)
895 return -ENOMEM;
896
897 port->count += 1;
898
899 return 0;
900 }
901
902 static void macvlan_uninit(struct net_device *dev)
903 {
904 struct macvlan_dev *vlan = netdev_priv(dev);
905 struct macvlan_port *port = vlan->port;
906
907 free_percpu(vlan->pcpu_stats);
908
909 macvlan_flush_sources(port, vlan);
910 port->count -= 1;
911 if (!port->count)
912 macvlan_port_destroy(port->dev);
913 }
914
915 static void macvlan_dev_get_stats64(struct net_device *dev,
916 struct rtnl_link_stats64 *stats)
917 {
918 struct macvlan_dev *vlan = netdev_priv(dev);
919
920 if (vlan->pcpu_stats) {
921 struct vlan_pcpu_stats *p;
922 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
923 u32 rx_errors = 0, tx_dropped = 0;
924 unsigned int start;
925 int i;
926
927 for_each_possible_cpu(i) {
928 p = per_cpu_ptr(vlan->pcpu_stats, i);
929 do {
930 start = u64_stats_fetch_begin_irq(&p->syncp);
931 rx_packets = p->rx_packets;
932 rx_bytes = p->rx_bytes;
933 rx_multicast = p->rx_multicast;
934 tx_packets = p->tx_packets;
935 tx_bytes = p->tx_bytes;
936 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
937
938 stats->rx_packets += rx_packets;
939 stats->rx_bytes += rx_bytes;
940 stats->multicast += rx_multicast;
941 stats->tx_packets += tx_packets;
942 stats->tx_bytes += tx_bytes;
943 /* rx_errors & tx_dropped are u32, updated
944 * without syncp protection.
945 */
946 rx_errors += p->rx_errors;
947 tx_dropped += p->tx_dropped;
948 }
949 stats->rx_errors = rx_errors;
950 stats->rx_dropped = rx_errors;
951 stats->tx_dropped = tx_dropped;
952 }
953 }
954
955 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
956 __be16 proto, u16 vid)
957 {
958 struct macvlan_dev *vlan = netdev_priv(dev);
959 struct net_device *lowerdev = vlan->lowerdev;
960
961 return vlan_vid_add(lowerdev, proto, vid);
962 }
963
964 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
965 __be16 proto, u16 vid)
966 {
967 struct macvlan_dev *vlan = netdev_priv(dev);
968 struct net_device *lowerdev = vlan->lowerdev;
969
970 vlan_vid_del(lowerdev, proto, vid);
971 return 0;
972 }
973
974 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
975 struct net_device *dev,
976 const unsigned char *addr, u16 vid,
977 u16 flags,
978 struct netlink_ext_ack *extack)
979 {
980 struct macvlan_dev *vlan = netdev_priv(dev);
981 int err = -EINVAL;
982
983 /* Support unicast filter only on passthru devices.
984 * Multicast filter should be allowed on all devices.
985 */
986 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
987 return -EOPNOTSUPP;
988
989 if (flags & NLM_F_REPLACE)
990 return -EOPNOTSUPP;
991
992 if (is_unicast_ether_addr(addr))
993 err = dev_uc_add_excl(dev, addr);
994 else if (is_multicast_ether_addr(addr))
995 err = dev_mc_add_excl(dev, addr);
996
997 return err;
998 }
999
1000 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1001 struct net_device *dev,
1002 const unsigned char *addr, u16 vid)
1003 {
1004 struct macvlan_dev *vlan = netdev_priv(dev);
1005 int err = -EINVAL;
1006
1007 /* Support unicast filter only on passthru devices.
1008 * Multicast filter should be allowed on all devices.
1009 */
1010 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1011 return -EOPNOTSUPP;
1012
1013 if (is_unicast_ether_addr(addr))
1014 err = dev_uc_del(dev, addr);
1015 else if (is_multicast_ether_addr(addr))
1016 err = dev_mc_del(dev, addr);
1017
1018 return err;
1019 }
1020
1021 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1022 struct ethtool_drvinfo *drvinfo)
1023 {
1024 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1025 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1026 }
1027
1028 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1029 struct ethtool_link_ksettings *cmd)
1030 {
1031 const struct macvlan_dev *vlan = netdev_priv(dev);
1032
1033 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1034 }
1035
1036 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1037 struct ethtool_ts_info *info)
1038 {
1039 struct net_device *real_dev = macvlan_dev_real_dev(dev);
1040 const struct ethtool_ops *ops = real_dev->ethtool_ops;
1041 struct phy_device *phydev = real_dev->phydev;
1042
1043 if (phydev && phydev->drv && phydev->drv->ts_info) {
1044 return phydev->drv->ts_info(phydev, info);
1045 } else if (ops->get_ts_info) {
1046 return ops->get_ts_info(real_dev, info);
1047 } else {
1048 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1049 SOF_TIMESTAMPING_SOFTWARE;
1050 info->phc_index = -1;
1051 }
1052
1053 return 0;
1054 }
1055
1056 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1057 netdev_features_t features)
1058 {
1059 struct macvlan_dev *vlan = netdev_priv(dev);
1060 netdev_features_t lowerdev_features = vlan->lowerdev->features;
1061 netdev_features_t mask;
1062
1063 features |= NETIF_F_ALL_FOR_ALL;
1064 features &= (vlan->set_features | ~MACVLAN_FEATURES);
1065 mask = features;
1066
1067 lowerdev_features &= (features | ~NETIF_F_LRO);
1068 features = netdev_increment_features(lowerdev_features, features, mask);
1069 features |= ALWAYS_ON_FEATURES;
1070 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1071
1072 return features;
1073 }
1074
1075 #ifdef CONFIG_NET_POLL_CONTROLLER
1076 static void macvlan_dev_poll_controller(struct net_device *dev)
1077 {
1078 return;
1079 }
1080
1081 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1082 {
1083 struct macvlan_dev *vlan = netdev_priv(dev);
1084 struct net_device *real_dev = vlan->lowerdev;
1085 struct netpoll *netpoll;
1086 int err = 0;
1087
1088 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1089 err = -ENOMEM;
1090 if (!netpoll)
1091 goto out;
1092
1093 err = __netpoll_setup(netpoll, real_dev);
1094 if (err) {
1095 kfree(netpoll);
1096 goto out;
1097 }
1098
1099 vlan->netpoll = netpoll;
1100
1101 out:
1102 return err;
1103 }
1104
1105 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1106 {
1107 struct macvlan_dev *vlan = netdev_priv(dev);
1108 struct netpoll *netpoll = vlan->netpoll;
1109
1110 if (!netpoll)
1111 return;
1112
1113 vlan->netpoll = NULL;
1114
1115 __netpoll_free(netpoll);
1116 }
1117 #endif /* CONFIG_NET_POLL_CONTROLLER */
1118
1119 static int macvlan_dev_get_iflink(const struct net_device *dev)
1120 {
1121 struct macvlan_dev *vlan = netdev_priv(dev);
1122
1123 return vlan->lowerdev->ifindex;
1124 }
1125
1126 static const struct ethtool_ops macvlan_ethtool_ops = {
1127 .get_link = ethtool_op_get_link,
1128 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1129 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1130 .get_ts_info = macvlan_ethtool_get_ts_info,
1131 };
1132
1133 static const struct net_device_ops macvlan_netdev_ops = {
1134 .ndo_init = macvlan_init,
1135 .ndo_uninit = macvlan_uninit,
1136 .ndo_open = macvlan_open,
1137 .ndo_stop = macvlan_stop,
1138 .ndo_start_xmit = macvlan_start_xmit,
1139 .ndo_change_mtu = macvlan_change_mtu,
1140 .ndo_do_ioctl = macvlan_do_ioctl,
1141 .ndo_fix_features = macvlan_fix_features,
1142 .ndo_change_rx_flags = macvlan_change_rx_flags,
1143 .ndo_set_mac_address = macvlan_set_mac_address,
1144 .ndo_set_rx_mode = macvlan_set_mac_lists,
1145 .ndo_get_stats64 = macvlan_dev_get_stats64,
1146 .ndo_validate_addr = eth_validate_addr,
1147 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1148 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1149 .ndo_fdb_add = macvlan_fdb_add,
1150 .ndo_fdb_del = macvlan_fdb_del,
1151 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1152 .ndo_get_lock_subclass = macvlan_get_nest_level,
1153 #ifdef CONFIG_NET_POLL_CONTROLLER
1154 .ndo_poll_controller = macvlan_dev_poll_controller,
1155 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1156 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1157 #endif
1158 .ndo_get_iflink = macvlan_dev_get_iflink,
1159 .ndo_features_check = passthru_features_check,
1160 .ndo_change_proto_down = dev_change_proto_down_generic,
1161 };
1162
1163 void macvlan_common_setup(struct net_device *dev)
1164 {
1165 ether_setup(dev);
1166
1167 dev->min_mtu = 0;
1168 dev->max_mtu = ETH_MAX_MTU;
1169 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1170 netif_keep_dst(dev);
1171 dev->priv_flags |= IFF_UNICAST_FLT;
1172 dev->netdev_ops = &macvlan_netdev_ops;
1173 dev->needs_free_netdev = true;
1174 dev->header_ops = &macvlan_hard_header_ops;
1175 dev->ethtool_ops = &macvlan_ethtool_ops;
1176 }
1177 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1178
1179 static void macvlan_setup(struct net_device *dev)
1180 {
1181 macvlan_common_setup(dev);
1182 dev->priv_flags |= IFF_NO_QUEUE;
1183 }
1184
1185 static int macvlan_port_create(struct net_device *dev)
1186 {
1187 struct macvlan_port *port;
1188 unsigned int i;
1189 int err;
1190
1191 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1192 return -EINVAL;
1193
1194 if (netdev_is_rx_handler_busy(dev))
1195 return -EBUSY;
1196
1197 port = kzalloc(sizeof(*port), GFP_KERNEL);
1198 if (port == NULL)
1199 return -ENOMEM;
1200
1201 port->dev = dev;
1202 ether_addr_copy(port->perm_addr, dev->dev_addr);
1203 INIT_LIST_HEAD(&port->vlans);
1204 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1205 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1206 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1207 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1208
1209 skb_queue_head_init(&port->bc_queue);
1210 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1211
1212 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1213 if (err)
1214 kfree(port);
1215 else
1216 dev->priv_flags |= IFF_MACVLAN_PORT;
1217 return err;
1218 }
1219
1220 static void macvlan_port_destroy(struct net_device *dev)
1221 {
1222 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1223 struct sk_buff *skb;
1224
1225 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1226 netdev_rx_handler_unregister(dev);
1227
1228 /* After this point, no packet can schedule bc_work anymore,
1229 * but we need to cancel it and purge left skbs if any.
1230 */
1231 cancel_work_sync(&port->bc_work);
1232
1233 while ((skb = __skb_dequeue(&port->bc_queue))) {
1234 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1235
1236 if (src)
1237 dev_put(src->dev);
1238
1239 kfree_skb(skb);
1240 }
1241
1242 /* If the lower device address has been changed by passthru
1243 * macvlan, put it back.
1244 */
1245 if (macvlan_passthru(port) &&
1246 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1247 struct sockaddr sa;
1248
1249 sa.sa_family = port->dev->type;
1250 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1251 dev_set_mac_address(port->dev, &sa, NULL);
1252 }
1253
1254 kfree(port);
1255 }
1256
1257 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1258 struct netlink_ext_ack *extack)
1259 {
1260 if (tb[IFLA_ADDRESS]) {
1261 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1262 return -EINVAL;
1263 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1264 return -EADDRNOTAVAIL;
1265 }
1266
1267 if (!data)
1268 return 0;
1269
1270 if (data[IFLA_MACVLAN_FLAGS] &&
1271 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1272 return -EINVAL;
1273
1274 if (data[IFLA_MACVLAN_MODE]) {
1275 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1276 case MACVLAN_MODE_PRIVATE:
1277 case MACVLAN_MODE_VEPA:
1278 case MACVLAN_MODE_BRIDGE:
1279 case MACVLAN_MODE_PASSTHRU:
1280 case MACVLAN_MODE_SOURCE:
1281 break;
1282 default:
1283 return -EINVAL;
1284 }
1285 }
1286
1287 if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1288 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1289 case MACVLAN_MACADDR_ADD:
1290 case MACVLAN_MACADDR_DEL:
1291 case MACVLAN_MACADDR_FLUSH:
1292 case MACVLAN_MACADDR_SET:
1293 break;
1294 default:
1295 return -EINVAL;
1296 }
1297 }
1298
1299 if (data[IFLA_MACVLAN_MACADDR]) {
1300 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1301 return -EINVAL;
1302
1303 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1304 return -EADDRNOTAVAIL;
1305 }
1306
1307 if (data[IFLA_MACVLAN_MACADDR_COUNT])
1308 return -EINVAL;
1309
1310 return 0;
1311 }
1312
1313 /**
1314 * reconfigure list of remote source mac address
1315 * (only for macvlan devices in source mode)
1316 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1317 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1318 */
1319 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1320 struct nlattr *data[])
1321 {
1322 char *addr = NULL;
1323 int ret, rem, len;
1324 struct nlattr *nla, *head;
1325 struct macvlan_source_entry *entry;
1326
1327 if (data[IFLA_MACVLAN_MACADDR])
1328 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1329
1330 if (mode == MACVLAN_MACADDR_ADD) {
1331 if (!addr)
1332 return -EINVAL;
1333
1334 return macvlan_hash_add_source(vlan, addr);
1335
1336 } else if (mode == MACVLAN_MACADDR_DEL) {
1337 if (!addr)
1338 return -EINVAL;
1339
1340 entry = macvlan_hash_lookup_source(vlan, addr);
1341 if (entry) {
1342 macvlan_hash_del_source(entry);
1343 vlan->macaddr_count--;
1344 }
1345 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1346 macvlan_flush_sources(vlan->port, vlan);
1347 } else if (mode == MACVLAN_MACADDR_SET) {
1348 macvlan_flush_sources(vlan->port, vlan);
1349
1350 if (addr) {
1351 ret = macvlan_hash_add_source(vlan, addr);
1352 if (ret)
1353 return ret;
1354 }
1355
1356 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1357 return 0;
1358
1359 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1360 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1361
1362 nla_for_each_attr(nla, head, len, rem) {
1363 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1364 nla_len(nla) != ETH_ALEN)
1365 continue;
1366
1367 addr = nla_data(nla);
1368 ret = macvlan_hash_add_source(vlan, addr);
1369 if (ret)
1370 return ret;
1371 }
1372 } else {
1373 return -EINVAL;
1374 }
1375
1376 return 0;
1377 }
1378
1379 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1380 struct nlattr *tb[], struct nlattr *data[],
1381 struct netlink_ext_ack *extack)
1382 {
1383 struct macvlan_dev *vlan = netdev_priv(dev);
1384 struct macvlan_port *port;
1385 struct net_device *lowerdev;
1386 int err;
1387 int macmode;
1388 bool create = false;
1389
1390 if (!tb[IFLA_LINK])
1391 return -EINVAL;
1392
1393 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1394 if (lowerdev == NULL)
1395 return -ENODEV;
1396
1397 /* When creating macvlans or macvtaps on top of other macvlans - use
1398 * the real device as the lowerdev.
1399 */
1400 if (netif_is_macvlan(lowerdev))
1401 lowerdev = macvlan_dev_real_dev(lowerdev);
1402
1403 if (!tb[IFLA_MTU])
1404 dev->mtu = lowerdev->mtu;
1405 else if (dev->mtu > lowerdev->mtu)
1406 return -EINVAL;
1407
1408 /* MTU range: 68 - lowerdev->max_mtu */
1409 dev->min_mtu = ETH_MIN_MTU;
1410 dev->max_mtu = lowerdev->max_mtu;
1411
1412 if (!tb[IFLA_ADDRESS])
1413 eth_hw_addr_random(dev);
1414
1415 if (!netif_is_macvlan_port(lowerdev)) {
1416 err = macvlan_port_create(lowerdev);
1417 if (err < 0)
1418 return err;
1419 create = true;
1420 }
1421 port = macvlan_port_get_rtnl(lowerdev);
1422
1423 /* Only 1 macvlan device can be created in passthru mode */
1424 if (macvlan_passthru(port)) {
1425 /* The macvlan port must be not created this time,
1426 * still goto destroy_macvlan_port for readability.
1427 */
1428 err = -EINVAL;
1429 goto destroy_macvlan_port;
1430 }
1431
1432 vlan->lowerdev = lowerdev;
1433 vlan->dev = dev;
1434 vlan->port = port;
1435 vlan->set_features = MACVLAN_FEATURES;
1436 vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1437
1438 vlan->mode = MACVLAN_MODE_VEPA;
1439 if (data && data[IFLA_MACVLAN_MODE])
1440 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1441
1442 if (data && data[IFLA_MACVLAN_FLAGS])
1443 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1444
1445 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1446 if (port->count) {
1447 err = -EINVAL;
1448 goto destroy_macvlan_port;
1449 }
1450 macvlan_set_passthru(port);
1451 eth_hw_addr_inherit(dev, lowerdev);
1452 }
1453
1454 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1455 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1456 err = -EINVAL;
1457 goto destroy_macvlan_port;
1458 }
1459 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1460 err = macvlan_changelink_sources(vlan, macmode, data);
1461 if (err)
1462 goto destroy_macvlan_port;
1463 }
1464
1465 err = register_netdevice(dev);
1466 if (err < 0)
1467 goto destroy_macvlan_port;
1468
1469 dev->priv_flags |= IFF_MACVLAN;
1470 err = netdev_upper_dev_link(lowerdev, dev, extack);
1471 if (err)
1472 goto unregister_netdev;
1473
1474 list_add_tail_rcu(&vlan->list, &port->vlans);
1475 netif_stacked_transfer_operstate(lowerdev, dev);
1476 linkwatch_fire_event(dev);
1477
1478 return 0;
1479
1480 unregister_netdev:
1481 /* macvlan_uninit would free the macvlan port */
1482 unregister_netdevice(dev);
1483 return err;
1484 destroy_macvlan_port:
1485 /* the macvlan port may be freed by macvlan_uninit when fail to register.
1486 * so we destroy the macvlan port only when it's valid.
1487 */
1488 if (create && macvlan_port_get_rtnl(lowerdev))
1489 macvlan_port_destroy(port->dev);
1490 return err;
1491 }
1492 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1493
1494 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1495 struct nlattr *tb[], struct nlattr *data[],
1496 struct netlink_ext_ack *extack)
1497 {
1498 return macvlan_common_newlink(src_net, dev, tb, data, extack);
1499 }
1500
1501 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1502 {
1503 struct macvlan_dev *vlan = netdev_priv(dev);
1504
1505 if (vlan->mode == MACVLAN_MODE_SOURCE)
1506 macvlan_flush_sources(vlan->port, vlan);
1507 list_del_rcu(&vlan->list);
1508 unregister_netdevice_queue(dev, head);
1509 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1510 }
1511 EXPORT_SYMBOL_GPL(macvlan_dellink);
1512
1513 static int macvlan_changelink(struct net_device *dev,
1514 struct nlattr *tb[], struct nlattr *data[],
1515 struct netlink_ext_ack *extack)
1516 {
1517 struct macvlan_dev *vlan = netdev_priv(dev);
1518 enum macvlan_mode mode;
1519 bool set_mode = false;
1520 enum macvlan_macaddr_mode macmode;
1521 int ret;
1522
1523 /* Validate mode, but don't set yet: setting flags may fail. */
1524 if (data && data[IFLA_MACVLAN_MODE]) {
1525 set_mode = true;
1526 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1527 /* Passthrough mode can't be set or cleared dynamically */
1528 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1529 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1530 return -EINVAL;
1531 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1532 vlan->mode != mode)
1533 macvlan_flush_sources(vlan->port, vlan);
1534 }
1535
1536 if (data && data[IFLA_MACVLAN_FLAGS]) {
1537 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1538 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1539 if (macvlan_passthru(vlan->port) && promisc) {
1540 int err;
1541
1542 if (flags & MACVLAN_FLAG_NOPROMISC)
1543 err = dev_set_promiscuity(vlan->lowerdev, -1);
1544 else
1545 err = dev_set_promiscuity(vlan->lowerdev, 1);
1546 if (err < 0)
1547 return err;
1548 }
1549 vlan->flags = flags;
1550 }
1551 if (set_mode)
1552 vlan->mode = mode;
1553 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1554 if (vlan->mode != MACVLAN_MODE_SOURCE)
1555 return -EINVAL;
1556 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1557 ret = macvlan_changelink_sources(vlan, macmode, data);
1558 if (ret)
1559 return ret;
1560 }
1561 return 0;
1562 }
1563
1564 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1565 {
1566 if (vlan->macaddr_count == 0)
1567 return 0;
1568 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1569 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1570 }
1571
1572 static size_t macvlan_get_size(const struct net_device *dev)
1573 {
1574 struct macvlan_dev *vlan = netdev_priv(dev);
1575
1576 return (0
1577 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1578 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1579 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1580 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1581 );
1582 }
1583
1584 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1585 const struct macvlan_dev *vlan,
1586 const int i)
1587 {
1588 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1589 struct macvlan_source_entry *entry;
1590
1591 hlist_for_each_entry_rcu(entry, h, hlist) {
1592 if (entry->vlan != vlan)
1593 continue;
1594 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1595 return 1;
1596 }
1597 return 0;
1598 }
1599
1600 static int macvlan_fill_info(struct sk_buff *skb,
1601 const struct net_device *dev)
1602 {
1603 struct macvlan_dev *vlan = netdev_priv(dev);
1604 int i;
1605 struct nlattr *nest;
1606
1607 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1608 goto nla_put_failure;
1609 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1610 goto nla_put_failure;
1611 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1612 goto nla_put_failure;
1613 if (vlan->macaddr_count > 0) {
1614 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1615 if (nest == NULL)
1616 goto nla_put_failure;
1617
1618 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1619 if (macvlan_fill_info_macaddr(skb, vlan, i))
1620 goto nla_put_failure;
1621 }
1622 nla_nest_end(skb, nest);
1623 }
1624 return 0;
1625
1626 nla_put_failure:
1627 return -EMSGSIZE;
1628 }
1629
1630 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1631 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1632 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1633 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1634 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1635 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1636 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1637 };
1638
1639 int macvlan_link_register(struct rtnl_link_ops *ops)
1640 {
1641 /* common fields */
1642 ops->validate = macvlan_validate;
1643 ops->maxtype = IFLA_MACVLAN_MAX;
1644 ops->policy = macvlan_policy;
1645 ops->changelink = macvlan_changelink;
1646 ops->get_size = macvlan_get_size;
1647 ops->fill_info = macvlan_fill_info;
1648
1649 return rtnl_link_register(ops);
1650 };
1651 EXPORT_SYMBOL_GPL(macvlan_link_register);
1652
1653 static struct net *macvlan_get_link_net(const struct net_device *dev)
1654 {
1655 return dev_net(macvlan_dev_real_dev(dev));
1656 }
1657
1658 static struct rtnl_link_ops macvlan_link_ops = {
1659 .kind = "macvlan",
1660 .setup = macvlan_setup,
1661 .newlink = macvlan_newlink,
1662 .dellink = macvlan_dellink,
1663 .get_link_net = macvlan_get_link_net,
1664 .priv_size = sizeof(struct macvlan_dev),
1665 };
1666
1667 static int macvlan_device_event(struct notifier_block *unused,
1668 unsigned long event, void *ptr)
1669 {
1670 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1671 struct macvlan_dev *vlan, *next;
1672 struct macvlan_port *port;
1673 LIST_HEAD(list_kill);
1674
1675 if (!netif_is_macvlan_port(dev))
1676 return NOTIFY_DONE;
1677
1678 port = macvlan_port_get_rtnl(dev);
1679
1680 switch (event) {
1681 case NETDEV_UP:
1682 case NETDEV_DOWN:
1683 case NETDEV_CHANGE:
1684 list_for_each_entry(vlan, &port->vlans, list)
1685 netif_stacked_transfer_operstate(vlan->lowerdev,
1686 vlan->dev);
1687 break;
1688 case NETDEV_FEAT_CHANGE:
1689 list_for_each_entry(vlan, &port->vlans, list) {
1690 vlan->dev->gso_max_size = dev->gso_max_size;
1691 vlan->dev->gso_max_segs = dev->gso_max_segs;
1692 netdev_update_features(vlan->dev);
1693 }
1694 break;
1695 case NETDEV_CHANGEMTU:
1696 list_for_each_entry(vlan, &port->vlans, list) {
1697 if (vlan->dev->mtu <= dev->mtu)
1698 continue;
1699 dev_set_mtu(vlan->dev, dev->mtu);
1700 }
1701 break;
1702 case NETDEV_CHANGEADDR:
1703 if (!macvlan_passthru(port))
1704 return NOTIFY_DONE;
1705
1706 vlan = list_first_entry_or_null(&port->vlans,
1707 struct macvlan_dev,
1708 list);
1709
1710 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1711 return NOTIFY_BAD;
1712
1713 break;
1714 case NETDEV_UNREGISTER:
1715 /* twiddle thumbs on netns device moves */
1716 if (dev->reg_state != NETREG_UNREGISTERING)
1717 break;
1718
1719 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1720 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1721 unregister_netdevice_many(&list_kill);
1722 break;
1723 case NETDEV_PRE_TYPE_CHANGE:
1724 /* Forbid underlaying device to change its type. */
1725 return NOTIFY_BAD;
1726
1727 case NETDEV_NOTIFY_PEERS:
1728 case NETDEV_BONDING_FAILOVER:
1729 case NETDEV_RESEND_IGMP:
1730 /* Propagate to all vlans */
1731 list_for_each_entry(vlan, &port->vlans, list)
1732 call_netdevice_notifiers(event, vlan->dev);
1733 }
1734 return NOTIFY_DONE;
1735 }
1736
1737 static struct notifier_block macvlan_notifier_block __read_mostly = {
1738 .notifier_call = macvlan_device_event,
1739 };
1740
1741 static int __init macvlan_init_module(void)
1742 {
1743 int err;
1744
1745 register_netdevice_notifier(&macvlan_notifier_block);
1746
1747 err = macvlan_link_register(&macvlan_link_ops);
1748 if (err < 0)
1749 goto err1;
1750 return 0;
1751 err1:
1752 unregister_netdevice_notifier(&macvlan_notifier_block);
1753 return err;
1754 }
1755
1756 static void __exit macvlan_cleanup_module(void)
1757 {
1758 rtnl_link_unregister(&macvlan_link_ops);
1759 unregister_netdevice_notifier(&macvlan_notifier_block);
1760 }
1761
1762 module_init(macvlan_init_module);
1763 module_exit(macvlan_cleanup_module);
1764
1765 MODULE_LICENSE("GPL");
1766 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1767 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1768 MODULE_ALIAS_RTNL_LINK("macvlan");
Ubuntu Hirsute Linux kernel mirror