?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
dm writecache: add cond_resched to loop in persistent_memory_claim()
[linux/fpc-iii.git] / drivers / net / macvlan.c
blobe900ebb94499d5dc43a54f05028f69bc0c4941f7
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 cond_resched();
339 }
340 }
341
342 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
343 const struct macvlan_dev *src,
344 struct sk_buff *skb)
345 {
346 struct sk_buff *nskb;
347 int err = -ENOMEM;
348
349 nskb = skb_clone(skb, GFP_ATOMIC);
350 if (!nskb)
351 goto err;
352
353 MACVLAN_SKB_CB(nskb)->src = src;
354
355 spin_lock(&port->bc_queue.lock);
356 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
357 if (src)
358 dev_hold(src->dev);
359 __skb_queue_tail(&port->bc_queue, nskb);
360 err = 0;
361 }
362 spin_unlock(&port->bc_queue.lock);
363
364 schedule_work(&port->bc_work);
365
366 if (err)
367 goto free_nskb;
368
369 return;
370
371 free_nskb:
372 kfree_skb(nskb);
373 err:
374 atomic_long_inc(&skb->dev->rx_dropped);
375 }
376
377 static void macvlan_flush_sources(struct macvlan_port *port,
378 struct macvlan_dev *vlan)
379 {
380 int i;
381
382 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
383 struct hlist_node *h, *n;
384
385 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
386 struct macvlan_source_entry *entry;
387
388 entry = hlist_entry(h, struct macvlan_source_entry,
389 hlist);
390 if (entry->vlan == vlan)
391 macvlan_hash_del_source(entry);
392 }
393 }
394 vlan->macaddr_count = 0;
395 }
396
397 static void macvlan_forward_source_one(struct sk_buff *skb,
398 struct macvlan_dev *vlan)
399 {
400 struct sk_buff *nskb;
401 struct net_device *dev;
402 int len;
403 int ret;
404
405 dev = vlan->dev;
406 if (unlikely(!(dev->flags & IFF_UP)))
407 return;
408
409 nskb = skb_clone(skb, GFP_ATOMIC);
410 if (!nskb)
411 return;
412
413 len = nskb->len + ETH_HLEN;
414 nskb->dev = dev;
415
416 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
417 nskb->pkt_type = PACKET_HOST;
418
419 ret = netif_rx(nskb);
420 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
421 }
422
423 static void macvlan_forward_source(struct sk_buff *skb,
424 struct macvlan_port *port,
425 const unsigned char *addr)
426 {
427 struct macvlan_source_entry *entry;
428 u32 idx = macvlan_eth_hash(addr);
429 struct hlist_head *h = &port->vlan_source_hash[idx];
430
431 hlist_for_each_entry_rcu(entry, h, hlist) {
432 if (ether_addr_equal_64bits(entry->addr, addr))
433 macvlan_forward_source_one(skb, entry->vlan);
434 }
435 }
436
437 /* called under rcu_read_lock() from netif_receive_skb */
438 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
439 {
440 struct macvlan_port *port;
441 struct sk_buff *skb = *pskb;
442 const struct ethhdr *eth = eth_hdr(skb);
443 const struct macvlan_dev *vlan;
444 const struct macvlan_dev *src;
445 struct net_device *dev;
446 unsigned int len = 0;
447 int ret;
448 rx_handler_result_t handle_res;
449
450 /* Packets from dev_loopback_xmit() do not have L2 header, bail out */
451 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
452 return RX_HANDLER_PASS;
453
454 port = macvlan_port_get_rcu(skb->dev);
455 if (is_multicast_ether_addr(eth->h_dest)) {
456 unsigned int hash;
457
458 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
459 if (!skb)
460 return RX_HANDLER_CONSUMED;
461 *pskb = skb;
462 eth = eth_hdr(skb);
463 macvlan_forward_source(skb, port, eth->h_source);
464 src = macvlan_hash_lookup(port, eth->h_source);
465 if (src && src->mode != MACVLAN_MODE_VEPA &&
466 src->mode != MACVLAN_MODE_BRIDGE) {
467 /* forward to original port. */
468 vlan = src;
469 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
470 netif_rx(skb);
471 handle_res = RX_HANDLER_CONSUMED;
472 goto out;
473 }
474
475 hash = mc_hash(NULL, eth->h_dest);
476 if (test_bit(hash, port->mc_filter))
477 macvlan_broadcast_enqueue(port, src, skb);
478
479 return RX_HANDLER_PASS;
480 }
481
482 macvlan_forward_source(skb, port, eth->h_source);
483 if (macvlan_passthru(port))
484 vlan = list_first_or_null_rcu(&port->vlans,
485 struct macvlan_dev, list);
486 else
487 vlan = macvlan_hash_lookup(port, eth->h_dest);
488 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
489 return RX_HANDLER_PASS;
490
491 dev = vlan->dev;
492 if (unlikely(!(dev->flags & IFF_UP))) {
493 kfree_skb(skb);
494 return RX_HANDLER_CONSUMED;
495 }
496 len = skb->len + ETH_HLEN;
497 skb = skb_share_check(skb, GFP_ATOMIC);
498 if (!skb) {
499 ret = NET_RX_DROP;
500 handle_res = RX_HANDLER_CONSUMED;
501 goto out;
502 }
503
504 *pskb = skb;
505 skb->dev = dev;
506 skb->pkt_type = PACKET_HOST;
507
508 ret = NET_RX_SUCCESS;
509 handle_res = RX_HANDLER_ANOTHER;
510 out:
511 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
512 return handle_res;
513 }
514
515 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
516 {
517 const struct macvlan_dev *vlan = netdev_priv(dev);
518 const struct macvlan_port *port = vlan->port;
519 const struct macvlan_dev *dest;
520
521 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
522 const struct ethhdr *eth = skb_eth_hdr(skb);
523
524 /* send to other bridge ports directly */
525 if (is_multicast_ether_addr(eth->h_dest)) {
526 skb_reset_mac_header(skb);
527 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
528 goto xmit_world;
529 }
530
531 dest = macvlan_hash_lookup(port, eth->h_dest);
532 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
533 /* send to lowerdev first for its network taps */
534 dev_forward_skb(vlan->lowerdev, skb);
535
536 return NET_XMIT_SUCCESS;
537 }
538 }
539 xmit_world:
540 skb->dev = vlan->lowerdev;
541 return dev_queue_xmit_accel(skb,
542 netdev_get_sb_channel(dev) ? dev : NULL);
543 }
544
545 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
546 {
547 #ifdef CONFIG_NET_POLL_CONTROLLER
548 if (vlan->netpoll)
549 netpoll_send_skb(vlan->netpoll, skb);
550 #else
551 BUG();
552 #endif
553 return NETDEV_TX_OK;
554 }
555
556 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
557 struct net_device *dev)
558 {
559 struct macvlan_dev *vlan = netdev_priv(dev);
560 unsigned int len = skb->len;
561 int ret;
562
563 if (unlikely(netpoll_tx_running(dev)))
564 return macvlan_netpoll_send_skb(vlan, skb);
565
566 ret = macvlan_queue_xmit(skb, dev);
567
568 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
569 struct vlan_pcpu_stats *pcpu_stats;
570
571 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
572 u64_stats_update_begin(&pcpu_stats->syncp);
573 pcpu_stats->tx_packets++;
574 pcpu_stats->tx_bytes += len;
575 u64_stats_update_end(&pcpu_stats->syncp);
576 } else {
577 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
578 }
579 return ret;
580 }
581
582 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
583 unsigned short type, const void *daddr,
584 const void *saddr, unsigned len)
585 {
586 const struct macvlan_dev *vlan = netdev_priv(dev);
587 struct net_device *lowerdev = vlan->lowerdev;
588
589 return dev_hard_header(skb, lowerdev, type, daddr,
590 saddr ? : dev->dev_addr, len);
591 }
592
593 static const struct header_ops macvlan_hard_header_ops = {
594 .create = macvlan_hard_header,
595 .parse = eth_header_parse,
596 .cache = eth_header_cache,
597 .cache_update = eth_header_cache_update,
598 };
599
600 static int macvlan_open(struct net_device *dev)
601 {
602 struct macvlan_dev *vlan = netdev_priv(dev);
603 struct net_device *lowerdev = vlan->lowerdev;
604 int err;
605
606 if (macvlan_passthru(vlan->port)) {
607 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
608 err = dev_set_promiscuity(lowerdev, 1);
609 if (err < 0)
610 goto out;
611 }
612 goto hash_add;
613 }
614
615 err = -EADDRINUSE;
616 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
617 goto out;
618
619 /* Attempt to populate accel_priv which is used to offload the L2
620 * forwarding requests for unicast packets.
621 */
622 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
623 vlan->accel_priv =
624 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
625
626 /* If earlier attempt to offload failed, or accel_priv is not
627 * populated we must add the unicast address to the lower device.
628 */
629 if (IS_ERR_OR_NULL(vlan->accel_priv)) {
630 vlan->accel_priv = NULL;
631 err = dev_uc_add(lowerdev, dev->dev_addr);
632 if (err < 0)
633 goto out;
634 }
635
636 if (dev->flags & IFF_ALLMULTI) {
637 err = dev_set_allmulti(lowerdev, 1);
638 if (err < 0)
639 goto del_unicast;
640 }
641
642 if (dev->flags & IFF_PROMISC) {
643 err = dev_set_promiscuity(lowerdev, 1);
644 if (err < 0)
645 goto clear_multi;
646 }
647
648 hash_add:
649 macvlan_hash_add(vlan);
650 return 0;
651
652 clear_multi:
653 if (dev->flags & IFF_ALLMULTI)
654 dev_set_allmulti(lowerdev, -1);
655 del_unicast:
656 if (vlan->accel_priv) {
657 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
658 vlan->accel_priv);
659 vlan->accel_priv = NULL;
660 } else {
661 dev_uc_del(lowerdev, dev->dev_addr);
662 }
663 out:
664 return err;
665 }
666
667 static int macvlan_stop(struct net_device *dev)
668 {
669 struct macvlan_dev *vlan = netdev_priv(dev);
670 struct net_device *lowerdev = vlan->lowerdev;
671
672 if (vlan->accel_priv) {
673 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
674 vlan->accel_priv);
675 vlan->accel_priv = NULL;
676 }
677
678 dev_uc_unsync(lowerdev, dev);
679 dev_mc_unsync(lowerdev, dev);
680
681 if (macvlan_passthru(vlan->port)) {
682 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
683 dev_set_promiscuity(lowerdev, -1);
684 goto hash_del;
685 }
686
687 if (dev->flags & IFF_ALLMULTI)
688 dev_set_allmulti(lowerdev, -1);
689
690 if (dev->flags & IFF_PROMISC)
691 dev_set_promiscuity(lowerdev, -1);
692
693 dev_uc_del(lowerdev, dev->dev_addr);
694
695 hash_del:
696 macvlan_hash_del(vlan, !dev->dismantle);
697 return 0;
698 }
699
700 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
701 {
702 struct macvlan_dev *vlan = netdev_priv(dev);
703 struct net_device *lowerdev = vlan->lowerdev;
704 struct macvlan_port *port = vlan->port;
705 int err;
706
707 if (!(dev->flags & IFF_UP)) {
708 /* Just copy in the new address */
709 ether_addr_copy(dev->dev_addr, addr);
710 } else {
711 /* Rehash and update the device filters */
712 if (macvlan_addr_busy(vlan->port, addr))
713 return -EADDRINUSE;
714
715 if (!macvlan_passthru(port)) {
716 err = dev_uc_add(lowerdev, addr);
717 if (err)
718 return err;
719
720 dev_uc_del(lowerdev, dev->dev_addr);
721 }
722
723 macvlan_hash_change_addr(vlan, addr);
724 }
725 if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
726 /* Since addr_change isn't set, we are here due to lower
727 * device change. Save the lower-dev address so we can
728 * restore it later.
729 */
730 ether_addr_copy(vlan->port->perm_addr,
731 lowerdev->dev_addr);
732 }
733 macvlan_clear_addr_change(port);
734 return 0;
735 }
736
737 static int macvlan_set_mac_address(struct net_device *dev, void *p)
738 {
739 struct macvlan_dev *vlan = netdev_priv(dev);
740 struct sockaddr *addr = p;
741
742 if (!is_valid_ether_addr(addr->sa_data))
743 return -EADDRNOTAVAIL;
744
745 /* If the addresses are the same, this is a no-op */
746 if (ether_addr_equal(dev->dev_addr, addr->sa_data))
747 return 0;
748
749 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
750 macvlan_set_addr_change(vlan->port);
751 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
752 }
753
754 if (macvlan_addr_busy(vlan->port, addr->sa_data))
755 return -EADDRINUSE;
756
757 return macvlan_sync_address(dev, addr->sa_data);
758 }
759
760 static void macvlan_change_rx_flags(struct net_device *dev, int change)
761 {
762 struct macvlan_dev *vlan = netdev_priv(dev);
763 struct net_device *lowerdev = vlan->lowerdev;
764
765 if (dev->flags & IFF_UP) {
766 if (change & IFF_ALLMULTI)
767 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
768 if (change & IFF_PROMISC)
769 dev_set_promiscuity(lowerdev,
770 dev->flags & IFF_PROMISC ? 1 : -1);
771
772 }
773 }
774
775 static void macvlan_compute_filter(unsigned long *mc_filter,
776 struct net_device *dev,
777 struct macvlan_dev *vlan)
778 {
779 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
780 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
781 } else {
782 struct netdev_hw_addr *ha;
783 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
784
785 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
786 netdev_for_each_mc_addr(ha, dev) {
787 __set_bit(mc_hash(vlan, ha->addr), filter);
788 }
789
790 __set_bit(mc_hash(vlan, dev->broadcast), filter);
791
792 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
793 }
794 }
795
796 static void macvlan_set_mac_lists(struct net_device *dev)
797 {
798 struct macvlan_dev *vlan = netdev_priv(dev);
799
800 macvlan_compute_filter(vlan->mc_filter, dev, vlan);
801
802 dev_uc_sync(vlan->lowerdev, dev);
803 dev_mc_sync(vlan->lowerdev, dev);
804
805 /* This is slightly inaccurate as we're including the subscription
806 * list of vlan->lowerdev too.
807 *
808 * Bug alert: This only works if everyone has the same broadcast
809 * address as lowerdev. As soon as someone changes theirs this
810 * will break.
811 *
812 * However, this is already broken as when you change your broadcast
813 * address we don't get called.
814 *
815 * The solution is to maintain a list of broadcast addresses like
816 * we do for uc/mc, if you care.
817 */
818 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
819 }
820
821 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
822 {
823 struct macvlan_dev *vlan = netdev_priv(dev);
824
825 if (vlan->lowerdev->mtu < new_mtu)
826 return -EINVAL;
827 dev->mtu = new_mtu;
828 return 0;
829 }
830
831 static int macvlan_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
832 {
833 struct net_device *real_dev = macvlan_dev_real_dev(dev);
834 const struct net_device_ops *ops = real_dev->netdev_ops;
835 struct ifreq ifrr;
836 int err = -EOPNOTSUPP;
837
838 strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
839 ifrr.ifr_ifru = ifr->ifr_ifru;
840
841 switch (cmd) {
842 case SIOCSHWTSTAMP:
843 if (!net_eq(dev_net(dev), &init_net))
844 break;
845 /* fall through */
846 case SIOCGHWTSTAMP:
847 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
848 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
849 break;
850 }
851
852 if (!err)
853 ifr->ifr_ifru = ifrr.ifr_ifru;
854
855 return err;
856 }
857
858 /*
859 * macvlan network devices have devices nesting below it and are a special
860 * "super class" of normal network devices; split their locks off into a
861 * separate class since they always nest.
862 */
863 #define ALWAYS_ON_OFFLOADS \
864 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
865 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
866
867 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
868
869 #define MACVLAN_FEATURES \
870 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
871 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
872 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
873 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
874
875 #define MACVLAN_STATE_MASK \
876 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
877
878 static int macvlan_init(struct net_device *dev)
879 {
880 struct macvlan_dev *vlan = netdev_priv(dev);
881 const struct net_device *lowerdev = vlan->lowerdev;
882 struct macvlan_port *port = vlan->port;
883
884 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
885 (lowerdev->state & MACVLAN_STATE_MASK);
886 dev->features = lowerdev->features & MACVLAN_FEATURES;
887 dev->features |= ALWAYS_ON_FEATURES;
888 dev->hw_features |= NETIF_F_LRO;
889 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
890 dev->vlan_features |= ALWAYS_ON_OFFLOADS;
891 dev->hw_enc_features |= dev->features;
892 dev->gso_max_size = lowerdev->gso_max_size;
893 dev->gso_max_segs = lowerdev->gso_max_segs;
894 dev->hard_header_len = lowerdev->hard_header_len;
895
896 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
897 if (!vlan->pcpu_stats)
898 return -ENOMEM;
899
900 port->count += 1;
901
902 return 0;
903 }
904
905 static void macvlan_uninit(struct net_device *dev)
906 {
907 struct macvlan_dev *vlan = netdev_priv(dev);
908 struct macvlan_port *port = vlan->port;
909
910 free_percpu(vlan->pcpu_stats);
911
912 macvlan_flush_sources(port, vlan);
913 port->count -= 1;
914 if (!port->count)
915 macvlan_port_destroy(port->dev);
916 }
917
918 static void macvlan_dev_get_stats64(struct net_device *dev,
919 struct rtnl_link_stats64 *stats)
920 {
921 struct macvlan_dev *vlan = netdev_priv(dev);
922
923 if (vlan->pcpu_stats) {
924 struct vlan_pcpu_stats *p;
925 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
926 u32 rx_errors = 0, tx_dropped = 0;
927 unsigned int start;
928 int i;
929
930 for_each_possible_cpu(i) {
931 p = per_cpu_ptr(vlan->pcpu_stats, i);
932 do {
933 start = u64_stats_fetch_begin_irq(&p->syncp);
934 rx_packets = p->rx_packets;
935 rx_bytes = p->rx_bytes;
936 rx_multicast = p->rx_multicast;
937 tx_packets = p->tx_packets;
938 tx_bytes = p->tx_bytes;
939 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
940
941 stats->rx_packets += rx_packets;
942 stats->rx_bytes += rx_bytes;
943 stats->multicast += rx_multicast;
944 stats->tx_packets += tx_packets;
945 stats->tx_bytes += tx_bytes;
946 /* rx_errors & tx_dropped are u32, updated
947 * without syncp protection.
948 */
949 rx_errors += p->rx_errors;
950 tx_dropped += p->tx_dropped;
951 }
952 stats->rx_errors = rx_errors;
953 stats->rx_dropped = rx_errors;
954 stats->tx_dropped = tx_dropped;
955 }
956 }
957
958 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
959 __be16 proto, u16 vid)
960 {
961 struct macvlan_dev *vlan = netdev_priv(dev);
962 struct net_device *lowerdev = vlan->lowerdev;
963
964 return vlan_vid_add(lowerdev, proto, vid);
965 }
966
967 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
968 __be16 proto, u16 vid)
969 {
970 struct macvlan_dev *vlan = netdev_priv(dev);
971 struct net_device *lowerdev = vlan->lowerdev;
972
973 vlan_vid_del(lowerdev, proto, vid);
974 return 0;
975 }
976
977 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
978 struct net_device *dev,
979 const unsigned char *addr, u16 vid,
980 u16 flags,
981 struct netlink_ext_ack *extack)
982 {
983 struct macvlan_dev *vlan = netdev_priv(dev);
984 int err = -EINVAL;
985
986 /* Support unicast filter only on passthru devices.
987 * Multicast filter should be allowed on all devices.
988 */
989 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
990 return -EOPNOTSUPP;
991
992 if (flags & NLM_F_REPLACE)
993 return -EOPNOTSUPP;
994
995 if (is_unicast_ether_addr(addr))
996 err = dev_uc_add_excl(dev, addr);
997 else if (is_multicast_ether_addr(addr))
998 err = dev_mc_add_excl(dev, addr);
999
1000 return err;
1001 }
1002
1003 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1004 struct net_device *dev,
1005 const unsigned char *addr, u16 vid)
1006 {
1007 struct macvlan_dev *vlan = netdev_priv(dev);
1008 int err = -EINVAL;
1009
1010 /* Support unicast filter only on passthru devices.
1011 * Multicast filter should be allowed on all devices.
1012 */
1013 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1014 return -EOPNOTSUPP;
1015
1016 if (is_unicast_ether_addr(addr))
1017 err = dev_uc_del(dev, addr);
1018 else if (is_multicast_ether_addr(addr))
1019 err = dev_mc_del(dev, addr);
1020
1021 return err;
1022 }
1023
1024 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1025 struct ethtool_drvinfo *drvinfo)
1026 {
1027 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1028 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1029 }
1030
1031 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1032 struct ethtool_link_ksettings *cmd)
1033 {
1034 const struct macvlan_dev *vlan = netdev_priv(dev);
1035
1036 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1037 }
1038
1039 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1040 struct ethtool_ts_info *info)
1041 {
1042 struct net_device *real_dev = macvlan_dev_real_dev(dev);
1043 const struct ethtool_ops *ops = real_dev->ethtool_ops;
1044 struct phy_device *phydev = real_dev->phydev;
1045
1046 if (phy_has_tsinfo(phydev)) {
1047 return phy_ts_info(phydev, info);
1048 } else if (ops->get_ts_info) {
1049 return ops->get_ts_info(real_dev, info);
1050 } else {
1051 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1052 SOF_TIMESTAMPING_SOFTWARE;
1053 info->phc_index = -1;
1054 }
1055
1056 return 0;
1057 }
1058
1059 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1060 netdev_features_t features)
1061 {
1062 struct macvlan_dev *vlan = netdev_priv(dev);
1063 netdev_features_t lowerdev_features = vlan->lowerdev->features;
1064 netdev_features_t mask;
1065
1066 features |= NETIF_F_ALL_FOR_ALL;
1067 features &= (vlan->set_features | ~MACVLAN_FEATURES);
1068 mask = features;
1069
1070 lowerdev_features &= (features | ~NETIF_F_LRO);
1071 features = netdev_increment_features(lowerdev_features, features, mask);
1072 features |= ALWAYS_ON_FEATURES;
1073 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1074
1075 return features;
1076 }
1077
1078 #ifdef CONFIG_NET_POLL_CONTROLLER
1079 static void macvlan_dev_poll_controller(struct net_device *dev)
1080 {
1081 return;
1082 }
1083
1084 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1085 {
1086 struct macvlan_dev *vlan = netdev_priv(dev);
1087 struct net_device *real_dev = vlan->lowerdev;
1088 struct netpoll *netpoll;
1089 int err = 0;
1090
1091 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1092 err = -ENOMEM;
1093 if (!netpoll)
1094 goto out;
1095
1096 err = __netpoll_setup(netpoll, real_dev);
1097 if (err) {
1098 kfree(netpoll);
1099 goto out;
1100 }
1101
1102 vlan->netpoll = netpoll;
1103
1104 out:
1105 return err;
1106 }
1107
1108 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1109 {
1110 struct macvlan_dev *vlan = netdev_priv(dev);
1111 struct netpoll *netpoll = vlan->netpoll;
1112
1113 if (!netpoll)
1114 return;
1115
1116 vlan->netpoll = NULL;
1117
1118 __netpoll_free(netpoll);
1119 }
1120 #endif /* CONFIG_NET_POLL_CONTROLLER */
1121
1122 static int macvlan_dev_get_iflink(const struct net_device *dev)
1123 {
1124 struct macvlan_dev *vlan = netdev_priv(dev);
1125
1126 return vlan->lowerdev->ifindex;
1127 }
1128
1129 static const struct ethtool_ops macvlan_ethtool_ops = {
1130 .get_link = ethtool_op_get_link,
1131 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1132 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1133 .get_ts_info = macvlan_ethtool_get_ts_info,
1134 };
1135
1136 static const struct net_device_ops macvlan_netdev_ops = {
1137 .ndo_init = macvlan_init,
1138 .ndo_uninit = macvlan_uninit,
1139 .ndo_open = macvlan_open,
1140 .ndo_stop = macvlan_stop,
1141 .ndo_start_xmit = macvlan_start_xmit,
1142 .ndo_change_mtu = macvlan_change_mtu,
1143 .ndo_do_ioctl = macvlan_do_ioctl,
1144 .ndo_fix_features = macvlan_fix_features,
1145 .ndo_change_rx_flags = macvlan_change_rx_flags,
1146 .ndo_set_mac_address = macvlan_set_mac_address,
1147 .ndo_set_rx_mode = macvlan_set_mac_lists,
1148 .ndo_get_stats64 = macvlan_dev_get_stats64,
1149 .ndo_validate_addr = eth_validate_addr,
1150 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1151 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1152 .ndo_fdb_add = macvlan_fdb_add,
1153 .ndo_fdb_del = macvlan_fdb_del,
1154 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1155 #ifdef CONFIG_NET_POLL_CONTROLLER
1156 .ndo_poll_controller = macvlan_dev_poll_controller,
1157 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1158 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1159 #endif
1160 .ndo_get_iflink = macvlan_dev_get_iflink,
1161 .ndo_features_check = passthru_features_check,
1162 .ndo_change_proto_down = dev_change_proto_down_generic,
1163 };
1164
1165 void macvlan_common_setup(struct net_device *dev)
1166 {
1167 ether_setup(dev);
1168
1169 dev->min_mtu = 0;
1170 dev->max_mtu = ETH_MAX_MTU;
1171 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1172 netif_keep_dst(dev);
1173 dev->priv_flags |= IFF_UNICAST_FLT;
1174 dev->netdev_ops = &macvlan_netdev_ops;
1175 dev->needs_free_netdev = true;
1176 dev->header_ops = &macvlan_hard_header_ops;
1177 dev->ethtool_ops = &macvlan_ethtool_ops;
1178 }
1179 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1180
1181 static void macvlan_setup(struct net_device *dev)
1182 {
1183 macvlan_common_setup(dev);
1184 dev->priv_flags |= IFF_NO_QUEUE;
1185 }
1186
1187 static int macvlan_port_create(struct net_device *dev)
1188 {
1189 struct macvlan_port *port;
1190 unsigned int i;
1191 int err;
1192
1193 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1194 return -EINVAL;
1195
1196 if (netdev_is_rx_handler_busy(dev))
1197 return -EBUSY;
1198
1199 port = kzalloc(sizeof(*port), GFP_KERNEL);
1200 if (port == NULL)
1201 return -ENOMEM;
1202
1203 port->dev = dev;
1204 ether_addr_copy(port->perm_addr, dev->dev_addr);
1205 INIT_LIST_HEAD(&port->vlans);
1206 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1207 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1208 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1209 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1210
1211 skb_queue_head_init(&port->bc_queue);
1212 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1213
1214 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1215 if (err)
1216 kfree(port);
1217 else
1218 dev->priv_flags |= IFF_MACVLAN_PORT;
1219 return err;
1220 }
1221
1222 static void macvlan_port_destroy(struct net_device *dev)
1223 {
1224 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1225 struct sk_buff *skb;
1226
1227 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1228 netdev_rx_handler_unregister(dev);
1229
1230 /* After this point, no packet can schedule bc_work anymore,
1231 * but we need to cancel it and purge left skbs if any.
1232 */
1233 cancel_work_sync(&port->bc_work);
1234
1235 while ((skb = __skb_dequeue(&port->bc_queue))) {
1236 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1237
1238 if (src)
1239 dev_put(src->dev);
1240
1241 kfree_skb(skb);
1242 }
1243
1244 /* If the lower device address has been changed by passthru
1245 * macvlan, put it back.
1246 */
1247 if (macvlan_passthru(port) &&
1248 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1249 struct sockaddr sa;
1250
1251 sa.sa_family = port->dev->type;
1252 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1253 dev_set_mac_address(port->dev, &sa, NULL);
1254 }
1255
1256 kfree(port);
1257 }
1258
1259 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1260 struct netlink_ext_ack *extack)
1261 {
1262 if (tb[IFLA_ADDRESS]) {
1263 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1264 return -EINVAL;
1265 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1266 return -EADDRNOTAVAIL;
1267 }
1268
1269 if (!data)
1270 return 0;
1271
1272 if (data[IFLA_MACVLAN_FLAGS] &&
1273 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1274 return -EINVAL;
1275
1276 if (data[IFLA_MACVLAN_MODE]) {
1277 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1278 case MACVLAN_MODE_PRIVATE:
1279 case MACVLAN_MODE_VEPA:
1280 case MACVLAN_MODE_BRIDGE:
1281 case MACVLAN_MODE_PASSTHRU:
1282 case MACVLAN_MODE_SOURCE:
1283 break;
1284 default:
1285 return -EINVAL;
1286 }
1287 }
1288
1289 if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1290 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1291 case MACVLAN_MACADDR_ADD:
1292 case MACVLAN_MACADDR_DEL:
1293 case MACVLAN_MACADDR_FLUSH:
1294 case MACVLAN_MACADDR_SET:
1295 break;
1296 default:
1297 return -EINVAL;
1298 }
1299 }
1300
1301 if (data[IFLA_MACVLAN_MACADDR]) {
1302 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1303 return -EINVAL;
1304
1305 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1306 return -EADDRNOTAVAIL;
1307 }
1308
1309 if (data[IFLA_MACVLAN_MACADDR_COUNT])
1310 return -EINVAL;
1311
1312 return 0;
1313 }
1314
1315 /**
1316 * reconfigure list of remote source mac address
1317 * (only for macvlan devices in source mode)
1318 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1319 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1320 */
1321 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1322 struct nlattr *data[])
1323 {
1324 char *addr = NULL;
1325 int ret, rem, len;
1326 struct nlattr *nla, *head;
1327 struct macvlan_source_entry *entry;
1328
1329 if (data[IFLA_MACVLAN_MACADDR])
1330 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1331
1332 if (mode == MACVLAN_MACADDR_ADD) {
1333 if (!addr)
1334 return -EINVAL;
1335
1336 return macvlan_hash_add_source(vlan, addr);
1337
1338 } else if (mode == MACVLAN_MACADDR_DEL) {
1339 if (!addr)
1340 return -EINVAL;
1341
1342 entry = macvlan_hash_lookup_source(vlan, addr);
1343 if (entry) {
1344 macvlan_hash_del_source(entry);
1345 vlan->macaddr_count--;
1346 }
1347 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1348 macvlan_flush_sources(vlan->port, vlan);
1349 } else if (mode == MACVLAN_MACADDR_SET) {
1350 macvlan_flush_sources(vlan->port, vlan);
1351
1352 if (addr) {
1353 ret = macvlan_hash_add_source(vlan, addr);
1354 if (ret)
1355 return ret;
1356 }
1357
1358 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1359 return 0;
1360
1361 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1362 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1363
1364 nla_for_each_attr(nla, head, len, rem) {
1365 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1366 nla_len(nla) != ETH_ALEN)
1367 continue;
1368
1369 addr = nla_data(nla);
1370 ret = macvlan_hash_add_source(vlan, addr);
1371 if (ret)
1372 return ret;
1373 }
1374 } else {
1375 return -EINVAL;
1376 }
1377
1378 return 0;
1379 }
1380
1381 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1382 struct nlattr *tb[], struct nlattr *data[],
1383 struct netlink_ext_ack *extack)
1384 {
1385 struct macvlan_dev *vlan = netdev_priv(dev);
1386 struct macvlan_port *port;
1387 struct net_device *lowerdev;
1388 int err;
1389 int macmode;
1390 bool create = false;
1391
1392 if (!tb[IFLA_LINK])
1393 return -EINVAL;
1394
1395 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1396 if (lowerdev == NULL)
1397 return -ENODEV;
1398
1399 /* When creating macvlans or macvtaps on top of other macvlans - use
1400 * the real device as the lowerdev.
1401 */
1402 if (netif_is_macvlan(lowerdev))
1403 lowerdev = macvlan_dev_real_dev(lowerdev);
1404
1405 if (!tb[IFLA_MTU])
1406 dev->mtu = lowerdev->mtu;
1407 else if (dev->mtu > lowerdev->mtu)
1408 return -EINVAL;
1409
1410 /* MTU range: 68 - lowerdev->max_mtu */
1411 dev->min_mtu = ETH_MIN_MTU;
1412 dev->max_mtu = lowerdev->max_mtu;
1413
1414 if (!tb[IFLA_ADDRESS])
1415 eth_hw_addr_random(dev);
1416
1417 if (!netif_is_macvlan_port(lowerdev)) {
1418 err = macvlan_port_create(lowerdev);
1419 if (err < 0)
1420 return err;
1421 create = true;
1422 }
1423 port = macvlan_port_get_rtnl(lowerdev);
1424
1425 /* Only 1 macvlan device can be created in passthru mode */
1426 if (macvlan_passthru(port)) {
1427 /* The macvlan port must be not created this time,
1428 * still goto destroy_macvlan_port for readability.
1429 */
1430 err = -EINVAL;
1431 goto destroy_macvlan_port;
1432 }
1433
1434 vlan->lowerdev = lowerdev;
1435 vlan->dev = dev;
1436 vlan->port = port;
1437 vlan->set_features = MACVLAN_FEATURES;
1438
1439 vlan->mode = MACVLAN_MODE_VEPA;
1440 if (data && data[IFLA_MACVLAN_MODE])
1441 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1442
1443 if (data && data[IFLA_MACVLAN_FLAGS])
1444 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1445
1446 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1447 if (port->count) {
1448 err = -EINVAL;
1449 goto destroy_macvlan_port;
1450 }
1451 macvlan_set_passthru(port);
1452 eth_hw_addr_inherit(dev, lowerdev);
1453 }
1454
1455 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1456 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1457 err = -EINVAL;
1458 goto destroy_macvlan_port;
1459 }
1460 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1461 err = macvlan_changelink_sources(vlan, macmode, data);
1462 if (err)
1463 goto destroy_macvlan_port;
1464 }
1465
1466 err = register_netdevice(dev);
1467 if (err < 0)
1468 goto destroy_macvlan_port;
1469
1470 dev->priv_flags |= IFF_MACVLAN;
1471 err = netdev_upper_dev_link(lowerdev, dev, extack);
1472 if (err)
1473 goto unregister_netdev;
1474
1475 list_add_tail_rcu(&vlan->list, &port->vlans);
1476 netif_stacked_transfer_operstate(lowerdev, dev);
1477 linkwatch_fire_event(dev);
1478
1479 return 0;
1480
1481 unregister_netdev:
1482 /* macvlan_uninit would free the macvlan port */
1483 unregister_netdevice(dev);
1484 return err;
1485 destroy_macvlan_port:
1486 /* the macvlan port may be freed by macvlan_uninit when fail to register.
1487 * so we destroy the macvlan port only when it's valid.
1488 */
1489 if (create && macvlan_port_get_rtnl(lowerdev))
1490 macvlan_port_destroy(port->dev);
1491 return err;
1492 }
1493 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1494
1495 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1496 struct nlattr *tb[], struct nlattr *data[],
1497 struct netlink_ext_ack *extack)
1498 {
1499 return macvlan_common_newlink(src_net, dev, tb, data, extack);
1500 }
1501
1502 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1503 {
1504 struct macvlan_dev *vlan = netdev_priv(dev);
1505
1506 if (vlan->mode == MACVLAN_MODE_SOURCE)
1507 macvlan_flush_sources(vlan->port, vlan);
1508 list_del_rcu(&vlan->list);
1509 unregister_netdevice_queue(dev, head);
1510 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1511 }
1512 EXPORT_SYMBOL_GPL(macvlan_dellink);
1513
1514 static int macvlan_changelink(struct net_device *dev,
1515 struct nlattr *tb[], struct nlattr *data[],
1516 struct netlink_ext_ack *extack)
1517 {
1518 struct macvlan_dev *vlan = netdev_priv(dev);
1519 enum macvlan_mode mode;
1520 bool set_mode = false;
1521 enum macvlan_macaddr_mode macmode;
1522 int ret;
1523
1524 /* Validate mode, but don't set yet: setting flags may fail. */
1525 if (data && data[IFLA_MACVLAN_MODE]) {
1526 set_mode = true;
1527 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1528 /* Passthrough mode can't be set or cleared dynamically */
1529 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1530 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1531 return -EINVAL;
1532 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1533 vlan->mode != mode)
1534 macvlan_flush_sources(vlan->port, vlan);
1535 }
1536
1537 if (data && data[IFLA_MACVLAN_FLAGS]) {
1538 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1539 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1540 if (macvlan_passthru(vlan->port) && promisc) {
1541 int err;
1542
1543 if (flags & MACVLAN_FLAG_NOPROMISC)
1544 err = dev_set_promiscuity(vlan->lowerdev, -1);
1545 else
1546 err = dev_set_promiscuity(vlan->lowerdev, 1);
1547 if (err < 0)
1548 return err;
1549 }
1550 vlan->flags = flags;
1551 }
1552 if (set_mode)
1553 vlan->mode = mode;
1554 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1555 if (vlan->mode != MACVLAN_MODE_SOURCE)
1556 return -EINVAL;
1557 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1558 ret = macvlan_changelink_sources(vlan, macmode, data);
1559 if (ret)
1560 return ret;
1561 }
1562 return 0;
1563 }
1564
1565 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1566 {
1567 if (vlan->macaddr_count == 0)
1568 return 0;
1569 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1570 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1571 }
1572
1573 static size_t macvlan_get_size(const struct net_device *dev)
1574 {
1575 struct macvlan_dev *vlan = netdev_priv(dev);
1576
1577 return (0
1578 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1579 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1580 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1581 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1582 );
1583 }
1584
1585 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1586 const struct macvlan_dev *vlan,
1587 const int i)
1588 {
1589 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1590 struct macvlan_source_entry *entry;
1591
1592 hlist_for_each_entry_rcu(entry, h, hlist) {
1593 if (entry->vlan != vlan)
1594 continue;
1595 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1596 return 1;
1597 }
1598 return 0;
1599 }
1600
1601 static int macvlan_fill_info(struct sk_buff *skb,
1602 const struct net_device *dev)
1603 {
1604 struct macvlan_dev *vlan = netdev_priv(dev);
1605 int i;
1606 struct nlattr *nest;
1607
1608 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1609 goto nla_put_failure;
1610 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1611 goto nla_put_failure;
1612 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1613 goto nla_put_failure;
1614 if (vlan->macaddr_count > 0) {
1615 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1616 if (nest == NULL)
1617 goto nla_put_failure;
1618
1619 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1620 if (macvlan_fill_info_macaddr(skb, vlan, i))
1621 goto nla_put_failure;
1622 }
1623 nla_nest_end(skb, nest);
1624 }
1625 return 0;
1626
1627 nla_put_failure:
1628 return -EMSGSIZE;
1629 }
1630
1631 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1632 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1633 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1634 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1635 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1636 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1637 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1638 };
1639
1640 int macvlan_link_register(struct rtnl_link_ops *ops)
1641 {
1642 /* common fields */
1643 ops->validate = macvlan_validate;
1644 ops->maxtype = IFLA_MACVLAN_MAX;
1645 ops->policy = macvlan_policy;
1646 ops->changelink = macvlan_changelink;
1647 ops->get_size = macvlan_get_size;
1648 ops->fill_info = macvlan_fill_info;
1649
1650 return rtnl_link_register(ops);
1651 };
1652 EXPORT_SYMBOL_GPL(macvlan_link_register);
1653
1654 static struct net *macvlan_get_link_net(const struct net_device *dev)
1655 {
1656 return dev_net(macvlan_dev_real_dev(dev));
1657 }
1658
1659 static struct rtnl_link_ops macvlan_link_ops = {
1660 .kind = "macvlan",
1661 .setup = macvlan_setup,
1662 .newlink = macvlan_newlink,
1663 .dellink = macvlan_dellink,
1664 .get_link_net = macvlan_get_link_net,
1665 .priv_size = sizeof(struct macvlan_dev),
1666 };
1667
1668 static int macvlan_device_event(struct notifier_block *unused,
1669 unsigned long event, void *ptr)
1670 {
1671 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1672 struct macvlan_dev *vlan, *next;
1673 struct macvlan_port *port;
1674 LIST_HEAD(list_kill);
1675
1676 if (!netif_is_macvlan_port(dev))
1677 return NOTIFY_DONE;
1678
1679 port = macvlan_port_get_rtnl(dev);
1680
1681 switch (event) {
1682 case NETDEV_UP:
1683 case NETDEV_DOWN:
1684 case NETDEV_CHANGE:
1685 list_for_each_entry(vlan, &port->vlans, list)
1686 netif_stacked_transfer_operstate(vlan->lowerdev,
1687 vlan->dev);
1688 break;
1689 case NETDEV_FEAT_CHANGE:
1690 list_for_each_entry(vlan, &port->vlans, list) {
1691 vlan->dev->gso_max_size = dev->gso_max_size;
1692 vlan->dev->gso_max_segs = dev->gso_max_segs;
1693 netdev_update_features(vlan->dev);
1694 }
1695 break;
1696 case NETDEV_CHANGEMTU:
1697 list_for_each_entry(vlan, &port->vlans, list) {
1698 if (vlan->dev->mtu <= dev->mtu)
1699 continue;
1700 dev_set_mtu(vlan->dev, dev->mtu);
1701 }
1702 break;
1703 case NETDEV_CHANGEADDR:
1704 if (!macvlan_passthru(port))
1705 return NOTIFY_DONE;
1706
1707 vlan = list_first_entry_or_null(&port->vlans,
1708 struct macvlan_dev,
1709 list);
1710
1711 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
1712 return NOTIFY_BAD;
1713
1714 break;
1715 case NETDEV_UNREGISTER:
1716 /* twiddle thumbs on netns device moves */
1717 if (dev->reg_state != NETREG_UNREGISTERING)
1718 break;
1719
1720 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1721 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1722 unregister_netdevice_many(&list_kill);
1723 break;
1724 case NETDEV_PRE_TYPE_CHANGE:
1725 /* Forbid underlaying device to change its type. */
1726 return NOTIFY_BAD;
1727
1728 case NETDEV_NOTIFY_PEERS:
1729 case NETDEV_BONDING_FAILOVER:
1730 case NETDEV_RESEND_IGMP:
1731 /* Propagate to all vlans */
1732 list_for_each_entry(vlan, &port->vlans, list)
1733 call_netdevice_notifiers(event, vlan->dev);
1734 }
1735 return NOTIFY_DONE;
1736 }
1737
1738 static struct notifier_block macvlan_notifier_block __read_mostly = {
1739 .notifier_call = macvlan_device_event,
1740 };
1741
1742 static int __init macvlan_init_module(void)
1743 {
1744 int err;
1745
1746 register_netdevice_notifier(&macvlan_notifier_block);
1747
1748 err = macvlan_link_register(&macvlan_link_ops);
1749 if (err < 0)
1750 goto err1;
1751 return 0;
1752 err1:
1753 unregister_netdevice_notifier(&macvlan_notifier_block);
1754 return err;
1755 }
1756
1757 static void __exit macvlan_cleanup_module(void)
1758 {
1759 rtnl_link_unregister(&macvlan_link_ops);
1760 unregister_netdevice_notifier(&macvlan_notifier_block);
1761 }
1762
1763 module_init(macvlan_init_module);
1764 module_exit(macvlan_cleanup_module);
1765
1766 MODULE_LICENSE("GPL");
1767 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1768 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1769 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux with added FPC-III support