?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
WIP FPC-III support
[linux/fpc-iii.git] / drivers / net / macvlan.c
blobfb51329f89645066b3531a00a0c87f44b356ca8f
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_DEFAULT_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 bc_queue_len_used;
50 u32 flags;
51 int count;
52 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
53 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
54 unsigned char perm_addr[ETH_ALEN];
55 };
56
57 struct macvlan_source_entry {
58 struct hlist_node hlist;
59 struct macvlan_dev *vlan;
60 unsigned char addr[6+2] __aligned(sizeof(u16));
61 struct rcu_head rcu;
62 };
63
64 struct macvlan_skb_cb {
65 const struct macvlan_dev *src;
66 };
67
68 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
69
70 static void macvlan_port_destroy(struct net_device *dev);
71 static void update_port_bc_queue_len(struct macvlan_port *port);
72
73 static inline bool macvlan_passthru(const struct macvlan_port *port)
74 {
75 return port->flags & MACVLAN_F_PASSTHRU;
76 }
77
78 static inline void macvlan_set_passthru(struct macvlan_port *port)
79 {
80 port->flags |= MACVLAN_F_PASSTHRU;
81 }
82
83 static inline bool macvlan_addr_change(const struct macvlan_port *port)
84 {
85 return port->flags & MACVLAN_F_ADDRCHANGE;
86 }
87
88 static inline void macvlan_set_addr_change(struct macvlan_port *port)
89 {
90 port->flags |= MACVLAN_F_ADDRCHANGE;
91 }
92
93 static inline void macvlan_clear_addr_change(struct macvlan_port *port)
94 {
95 port->flags &= ~MACVLAN_F_ADDRCHANGE;
96 }
97
98 /* Hash Ethernet address */
99 static u32 macvlan_eth_hash(const unsigned char *addr)
100 {
101 u64 value = get_unaligned((u64 *)addr);
102
103 /* only want 6 bytes */
104 #ifdef __BIG_ENDIAN
105 value >>= 16;
106 #else
107 value <<= 16;
108 #endif
109 return hash_64(value, MACVLAN_HASH_BITS);
110 }
111
112 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
113 {
114 return rcu_dereference(dev->rx_handler_data);
115 }
116
117 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
118 {
119 return rtnl_dereference(dev->rx_handler_data);
120 }
121
122 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
123 const unsigned char *addr)
124 {
125 struct macvlan_dev *vlan;
126 u32 idx = macvlan_eth_hash(addr);
127
128 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist,
129 lockdep_rtnl_is_held()) {
130 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
131 return vlan;
132 }
133 return NULL;
134 }
135
136 static struct macvlan_source_entry *macvlan_hash_lookup_source(
137 const struct macvlan_dev *vlan,
138 const unsigned char *addr)
139 {
140 struct macvlan_source_entry *entry;
141 u32 idx = macvlan_eth_hash(addr);
142 struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
143
144 hlist_for_each_entry_rcu(entry, h, hlist) {
145 if (ether_addr_equal_64bits(entry->addr, addr) &&
146 entry->vlan == vlan)
147 return entry;
148 }
149 return NULL;
150 }
151
152 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
153 const unsigned char *addr)
154 {
155 struct macvlan_port *port = vlan->port;
156 struct macvlan_source_entry *entry;
157 struct hlist_head *h;
158
159 entry = macvlan_hash_lookup_source(vlan, addr);
160 if (entry)
161 return 0;
162
163 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
164 if (!entry)
165 return -ENOMEM;
166
167 ether_addr_copy(entry->addr, addr);
168 entry->vlan = vlan;
169 h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
170 hlist_add_head_rcu(&entry->hlist, h);
171 vlan->macaddr_count++;
172
173 return 0;
174 }
175
176 static void macvlan_hash_add(struct macvlan_dev *vlan)
177 {
178 struct macvlan_port *port = vlan->port;
179 const unsigned char *addr = vlan->dev->dev_addr;
180 u32 idx = macvlan_eth_hash(addr);
181
182 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
183 }
184
185 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
186 {
187 hlist_del_rcu(&entry->hlist);
188 kfree_rcu(entry, rcu);
189 }
190
191 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
192 {
193 hlist_del_rcu(&vlan->hlist);
194 if (sync)
195 synchronize_rcu();
196 }
197
198 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
199 const unsigned char *addr)
200 {
201 macvlan_hash_del(vlan, true);
202 /* Now that we are unhashed it is safe to change the device
203 * address without confusing packet delivery.
204 */
205 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
206 macvlan_hash_add(vlan);
207 }
208
209 static bool macvlan_addr_busy(const struct macvlan_port *port,
210 const unsigned char *addr)
211 {
212 /* Test to see if the specified address is
213 * currently in use by the underlying device or
214 * another macvlan.
215 */
216 if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
217 ether_addr_equal_64bits(port->dev->dev_addr, addr))
218 return true;
219
220 if (macvlan_hash_lookup(port, addr))
221 return true;
222
223 return false;
224 }
225
226
227 static int macvlan_broadcast_one(struct sk_buff *skb,
228 const struct macvlan_dev *vlan,
229 const struct ethhdr *eth, bool local)
230 {
231 struct net_device *dev = vlan->dev;
232
233 if (local)
234 return __dev_forward_skb(dev, skb);
235
236 skb->dev = dev;
237 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
238 skb->pkt_type = PACKET_BROADCAST;
239 else
240 skb->pkt_type = PACKET_MULTICAST;
241
242 return 0;
243 }
244
245 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
246 {
247 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
248 }
249
250
251 static unsigned int mc_hash(const struct macvlan_dev *vlan,
252 const unsigned char *addr)
253 {
254 u32 val = __get_unaligned_cpu32(addr + 2);
255
256 val ^= macvlan_hash_mix(vlan);
257 return hash_32(val, MACVLAN_MC_FILTER_BITS);
258 }
259
260 static void macvlan_broadcast(struct sk_buff *skb,
261 const struct macvlan_port *port,
262 struct net_device *src,
263 enum macvlan_mode mode)
264 {
265 const struct ethhdr *eth = eth_hdr(skb);
266 const struct macvlan_dev *vlan;
267 struct sk_buff *nskb;
268 unsigned int i;
269 int err;
270 unsigned int hash;
271
272 if (skb->protocol == htons(ETH_P_PAUSE))
273 return;
274
275 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
276 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
277 if (vlan->dev == src || !(vlan->mode & mode))
278 continue;
279
280 hash = mc_hash(vlan, eth->h_dest);
281 if (!test_bit(hash, vlan->mc_filter))
282 continue;
283
284 err = NET_RX_DROP;
285 nskb = skb_clone(skb, GFP_ATOMIC);
286 if (likely(nskb))
287 err = macvlan_broadcast_one(
288 nskb, vlan, eth,
289 mode == MACVLAN_MODE_BRIDGE) ?:
290 netif_rx_ni(nskb);
291 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
292 err == NET_RX_SUCCESS, true);
293 }
294 }
295 }
296
297 static void macvlan_process_broadcast(struct work_struct *w)
298 {
299 struct macvlan_port *port = container_of(w, struct macvlan_port,
300 bc_work);
301 struct sk_buff *skb;
302 struct sk_buff_head list;
303
304 __skb_queue_head_init(&list);
305
306 spin_lock_bh(&port->bc_queue.lock);
307 skb_queue_splice_tail_init(&port->bc_queue, &list);
308 spin_unlock_bh(&port->bc_queue.lock);
309
310 while ((skb = __skb_dequeue(&list))) {
311 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
312
313 rcu_read_lock();
314
315 if (!src)
316 /* frame comes from an external address */
317 macvlan_broadcast(skb, port, NULL,
318 MACVLAN_MODE_PRIVATE |
319 MACVLAN_MODE_VEPA |
320 MACVLAN_MODE_PASSTHRU|
321 MACVLAN_MODE_BRIDGE);
322 else if (src->mode == MACVLAN_MODE_VEPA)
323 /* flood to everyone except source */
324 macvlan_broadcast(skb, port, src->dev,
325 MACVLAN_MODE_VEPA |
326 MACVLAN_MODE_BRIDGE);
327 else
328 /*
329 * flood only to VEPA ports, bridge ports
330 * already saw the frame on the way out.
331 */
332 macvlan_broadcast(skb, port, src->dev,
333 MACVLAN_MODE_VEPA);
334
335 rcu_read_unlock();
336
337 if (src)
338 dev_put(src->dev);
339 consume_skb(skb);
340
341 cond_resched();
342 }
343 }
344
345 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
346 const struct macvlan_dev *src,
347 struct sk_buff *skb)
348 {
349 struct sk_buff *nskb;
350 int err = -ENOMEM;
351
352 nskb = skb_clone(skb, GFP_ATOMIC);
353 if (!nskb)
354 goto err;
355
356 MACVLAN_SKB_CB(nskb)->src = src;
357
358 spin_lock(&port->bc_queue.lock);
359 if (skb_queue_len(&port->bc_queue) < port->bc_queue_len_used) {
360 if (src)
361 dev_hold(src->dev);
362 __skb_queue_tail(&port->bc_queue, nskb);
363 err = 0;
364 }
365 spin_unlock(&port->bc_queue.lock);
366
367 schedule_work(&port->bc_work);
368
369 if (err)
370 goto free_nskb;
371
372 return;
373
374 free_nskb:
375 kfree_skb(nskb);
376 err:
377 atomic_long_inc(&skb->dev->rx_dropped);
378 }
379
380 static void macvlan_flush_sources(struct macvlan_port *port,
381 struct macvlan_dev *vlan)
382 {
383 int i;
384
385 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
386 struct hlist_node *h, *n;
387
388 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
389 struct macvlan_source_entry *entry;
390
391 entry = hlist_entry(h, struct macvlan_source_entry,
392 hlist);
393 if (entry->vlan == vlan)
394 macvlan_hash_del_source(entry);
395 }
396 }
397 vlan->macaddr_count = 0;
398 }
399
400 static void macvlan_forward_source_one(struct sk_buff *skb,
401 struct macvlan_dev *vlan)
402 {
403 struct sk_buff *nskb;
404 struct net_device *dev;
405 int len;
406 int ret;
407
408 dev = vlan->dev;
409 if (unlikely(!(dev->flags & IFF_UP)))
410 return;
411
412 nskb = skb_clone(skb, GFP_ATOMIC);
413 if (!nskb)
414 return;
415
416 len = nskb->len + ETH_HLEN;
417 nskb->dev = dev;
418
419 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
420 nskb->pkt_type = PACKET_HOST;
421
422 ret = netif_rx(nskb);
423 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
424 }
425
426 static void macvlan_forward_source(struct sk_buff *skb,
427 struct macvlan_port *port,
428 const unsigned char *addr)
429 {
430 struct macvlan_source_entry *entry;
431 u32 idx = macvlan_eth_hash(addr);
432 struct hlist_head *h = &port->vlan_source_hash[idx];
433
434 hlist_for_each_entry_rcu(entry, h, hlist) {
435 if (ether_addr_equal_64bits(entry->addr, addr))
436 macvlan_forward_source_one(skb, entry->vlan);
437 }
438 }
439
440 /* called under rcu_read_lock() from netif_receive_skb */
441 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
442 {
443 struct macvlan_port *port;
444 struct sk_buff *skb = *pskb;
445 const struct ethhdr *eth = eth_hdr(skb);
446 const struct macvlan_dev *vlan;
447 const struct macvlan_dev *src;
448 struct net_device *dev;
449 unsigned int len = 0;
450 int ret;
451 rx_handler_result_t handle_res;
452
453 /* Packets from dev_loopback_xmit() do not have L2 header, bail out */
454 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
455 return RX_HANDLER_PASS;
456
457 port = macvlan_port_get_rcu(skb->dev);
458 if (is_multicast_ether_addr(eth->h_dest)) {
459 unsigned int hash;
460
461 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
462 if (!skb)
463 return RX_HANDLER_CONSUMED;
464 *pskb = skb;
465 eth = eth_hdr(skb);
466 macvlan_forward_source(skb, port, eth->h_source);
467 src = macvlan_hash_lookup(port, eth->h_source);
468 if (src && src->mode != MACVLAN_MODE_VEPA &&
469 src->mode != MACVLAN_MODE_BRIDGE) {
470 /* forward to original port. */
471 vlan = src;
472 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
473 netif_rx(skb);
474 handle_res = RX_HANDLER_CONSUMED;
475 goto out;
476 }
477
478 hash = mc_hash(NULL, eth->h_dest);
479 if (test_bit(hash, port->mc_filter))
480 macvlan_broadcast_enqueue(port, src, skb);
481
482 return RX_HANDLER_PASS;
483 }
484
485 macvlan_forward_source(skb, port, eth->h_source);
486 if (macvlan_passthru(port))
487 vlan = list_first_or_null_rcu(&port->vlans,
488 struct macvlan_dev, list);
489 else
490 vlan = macvlan_hash_lookup(port, eth->h_dest);
491 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
492 return RX_HANDLER_PASS;
493
494 dev = vlan->dev;
495 if (unlikely(!(dev->flags & IFF_UP))) {
496 kfree_skb(skb);
497 return RX_HANDLER_CONSUMED;
498 }
499 len = skb->len + ETH_HLEN;
500 skb = skb_share_check(skb, GFP_ATOMIC);
501 if (!skb) {
502 ret = NET_RX_DROP;
503 handle_res = RX_HANDLER_CONSUMED;
504 goto out;
505 }
506
507 *pskb = skb;
508 skb->dev = dev;
509 skb->pkt_type = PACKET_HOST;
510
511 ret = NET_RX_SUCCESS;
512 handle_res = RX_HANDLER_ANOTHER;
513 out:
514 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
515 return handle_res;
516 }
517
518 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
519 {
520 const struct macvlan_dev *vlan = netdev_priv(dev);
521 const struct macvlan_port *port = vlan->port;
522 const struct macvlan_dev *dest;
523
524 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
525 const struct ethhdr *eth = skb_eth_hdr(skb);
526
527 /* send to other bridge ports directly */
528 if (is_multicast_ether_addr(eth->h_dest)) {
529 skb_reset_mac_header(skb);
530 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
531 goto xmit_world;
532 }
533
534 dest = macvlan_hash_lookup(port, eth->h_dest);
535 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
536 /* send to lowerdev first for its network taps */
537 dev_forward_skb(vlan->lowerdev, skb);
538
539 return NET_XMIT_SUCCESS;
540 }
541 }
542 xmit_world:
543 skb->dev = vlan->lowerdev;
544 return dev_queue_xmit_accel(skb,
545 netdev_get_sb_channel(dev) ? dev : NULL);
546 }
547
548 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
549 {
550 #ifdef CONFIG_NET_POLL_CONTROLLER
551 return netpoll_send_skb(vlan->netpoll, skb);
552 #else
553 BUG();
554 return NETDEV_TX_OK;
555 #endif
556 }
557
558 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
559 struct net_device *dev)
560 {
561 struct macvlan_dev *vlan = netdev_priv(dev);
562 unsigned int len = skb->len;
563 int ret;
564
565 if (unlikely(netpoll_tx_running(dev)))
566 return macvlan_netpoll_send_skb(vlan, skb);
567
568 ret = macvlan_queue_xmit(skb, dev);
569
570 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
571 struct vlan_pcpu_stats *pcpu_stats;
572
573 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
574 u64_stats_update_begin(&pcpu_stats->syncp);
575 pcpu_stats->tx_packets++;
576 pcpu_stats->tx_bytes += len;
577 u64_stats_update_end(&pcpu_stats->syncp);
578 } else {
579 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
580 }
581 return ret;
582 }
583
584 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
585 unsigned short type, const void *daddr,
586 const void *saddr, unsigned len)
587 {
588 const struct macvlan_dev *vlan = netdev_priv(dev);
589 struct net_device *lowerdev = vlan->lowerdev;
590
591 return dev_hard_header(skb, lowerdev, type, daddr,
592 saddr ? : dev->dev_addr, len);
593 }
594
595 static const struct header_ops macvlan_hard_header_ops = {
596 .create = macvlan_hard_header,
597 .parse = eth_header_parse,
598 .cache = eth_header_cache,
599 .cache_update = eth_header_cache_update,
600 };
601
602 static int macvlan_open(struct net_device *dev)
603 {
604 struct macvlan_dev *vlan = netdev_priv(dev);
605 struct net_device *lowerdev = vlan->lowerdev;
606 int err;
607
608 if (macvlan_passthru(vlan->port)) {
609 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
610 err = dev_set_promiscuity(lowerdev, 1);
611 if (err < 0)
612 goto out;
613 }
614 goto hash_add;
615 }
616
617 err = -EADDRINUSE;
618 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
619 goto out;
620
621 /* Attempt to populate accel_priv which is used to offload the L2
622 * forwarding requests for unicast packets.
623 */
624 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
625 vlan->accel_priv =
626 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
627
628 /* If earlier attempt to offload failed, or accel_priv is not
629 * populated we must add the unicast address to the lower device.
630 */
631 if (IS_ERR_OR_NULL(vlan->accel_priv)) {
632 vlan->accel_priv = NULL;
633 err = dev_uc_add(lowerdev, dev->dev_addr);
634 if (err < 0)
635 goto out;
636 }
637
638 if (dev->flags & IFF_ALLMULTI) {
639 err = dev_set_allmulti(lowerdev, 1);
640 if (err < 0)
641 goto del_unicast;
642 }
643
644 if (dev->flags & IFF_PROMISC) {
645 err = dev_set_promiscuity(lowerdev, 1);
646 if (err < 0)
647 goto clear_multi;
648 }
649
650 hash_add:
651 macvlan_hash_add(vlan);
652 return 0;
653
654 clear_multi:
655 if (dev->flags & IFF_ALLMULTI)
656 dev_set_allmulti(lowerdev, -1);
657 del_unicast:
658 if (vlan->accel_priv) {
659 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
660 vlan->accel_priv);
661 vlan->accel_priv = NULL;
662 } else {
663 dev_uc_del(lowerdev, dev->dev_addr);
664 }
665 out:
666 return err;
667 }
668
669 static int macvlan_stop(struct net_device *dev)
670 {
671 struct macvlan_dev *vlan = netdev_priv(dev);
672 struct net_device *lowerdev = vlan->lowerdev;
673
674 if (vlan->accel_priv) {
675 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
676 vlan->accel_priv);
677 vlan->accel_priv = NULL;
678 }
679
680 dev_uc_unsync(lowerdev, dev);
681 dev_mc_unsync(lowerdev, dev);
682
683 if (macvlan_passthru(vlan->port)) {
684 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
685 dev_set_promiscuity(lowerdev, -1);
686 goto hash_del;
687 }
688
689 if (dev->flags & IFF_ALLMULTI)
690 dev_set_allmulti(lowerdev, -1);
691
692 if (dev->flags & IFF_PROMISC)
693 dev_set_promiscuity(lowerdev, -1);
694
695 dev_uc_del(lowerdev, dev->dev_addr);
696
697 hash_del:
698 macvlan_hash_del(vlan, !dev->dismantle);
699 return 0;
700 }
701
702 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
703 {
704 struct macvlan_dev *vlan = netdev_priv(dev);
705 struct net_device *lowerdev = vlan->lowerdev;
706 struct macvlan_port *port = vlan->port;
707 int err;
708
709 if (!(dev->flags & IFF_UP)) {
710 /* Just copy in the new address */
711 ether_addr_copy(dev->dev_addr, addr);
712 } else {
713 /* Rehash and update the device filters */
714 if (macvlan_addr_busy(vlan->port, addr))
715 return -EADDRINUSE;
716
717 if (!macvlan_passthru(port)) {
718 err = dev_uc_add(lowerdev, addr);
719 if (err)
720 return err;
721
722 dev_uc_del(lowerdev, dev->dev_addr);
723 }
724
725 macvlan_hash_change_addr(vlan, addr);
726 }
727 if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
728 /* Since addr_change isn't set, we are here due to lower
729 * device change. Save the lower-dev address so we can
730 * restore it later.
731 */
732 ether_addr_copy(vlan->port->perm_addr,
733 lowerdev->dev_addr);
734 }
735 macvlan_clear_addr_change(port);
736 return 0;
737 }
738
739 static int macvlan_set_mac_address(struct net_device *dev, void *p)
740 {
741 struct macvlan_dev *vlan = netdev_priv(dev);
742 struct sockaddr *addr = p;
743
744 if (!is_valid_ether_addr(addr->sa_data))
745 return -EADDRNOTAVAIL;
746
747 /* If the addresses are the same, this is a no-op */
748 if (ether_addr_equal(dev->dev_addr, addr->sa_data))
749 return 0;
750
751 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
752 macvlan_set_addr_change(vlan->port);
753 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
754 }
755
756 if (macvlan_addr_busy(vlan->port, addr->sa_data))
757 return -EADDRINUSE;
758
759 return macvlan_sync_address(dev, addr->sa_data);
760 }
761
762 static void macvlan_change_rx_flags(struct net_device *dev, int change)
763 {
764 struct macvlan_dev *vlan = netdev_priv(dev);
765 struct net_device *lowerdev = vlan->lowerdev;
766
767 if (dev->flags & IFF_UP) {
768 if (change & IFF_ALLMULTI)
769 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
770 if (change & IFF_PROMISC)
771 dev_set_promiscuity(lowerdev,
772 dev->flags & IFF_PROMISC ? 1 : -1);
773
774 }
775 }
776
777 static void macvlan_compute_filter(unsigned long *mc_filter,
778 struct net_device *dev,
779 struct macvlan_dev *vlan)
780 {
781 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
782 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
783 } else {
784 struct netdev_hw_addr *ha;
785 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
786
787 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
788 netdev_for_each_mc_addr(ha, dev) {
789 __set_bit(mc_hash(vlan, ha->addr), filter);
790 }
791
792 __set_bit(mc_hash(vlan, dev->broadcast), filter);
793
794 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
795 }
796 }
797
798 static void macvlan_set_mac_lists(struct net_device *dev)
799 {
800 struct macvlan_dev *vlan = netdev_priv(dev);
801
802 macvlan_compute_filter(vlan->mc_filter, dev, vlan);
803
804 dev_uc_sync(vlan->lowerdev, dev);
805 dev_mc_sync(vlan->lowerdev, dev);
806
807 /* This is slightly inaccurate as we're including the subscription
808 * list of vlan->lowerdev too.
809 *
810 * Bug alert: This only works if everyone has the same broadcast
811 * address as lowerdev. As soon as someone changes theirs this
812 * will break.
813 *
814 * However, this is already broken as when you change your broadcast
815 * address we don't get called.
816 *
817 * The solution is to maintain a list of broadcast addresses like
818 * we do for uc/mc, if you care.
819 */
820 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
821 }
822
823 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
824 {
825 struct macvlan_dev *vlan = netdev_priv(dev);
826
827 if (vlan->lowerdev->mtu < new_mtu)
828 return -EINVAL;
829 dev->mtu = new_mtu;
830 return 0;
831 }
832
833 static int macvlan_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
834 {
835 struct net_device *real_dev = macvlan_dev_real_dev(dev);
836 const struct net_device_ops *ops = real_dev->netdev_ops;
837 struct ifreq ifrr;
838 int err = -EOPNOTSUPP;
839
840 strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
841 ifrr.ifr_ifru = ifr->ifr_ifru;
842
843 switch (cmd) {
844 case SIOCSHWTSTAMP:
845 if (!net_eq(dev_net(dev), &init_net))
846 break;
847 fallthrough;
848 case SIOCGHWTSTAMP:
849 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
850 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
851 break;
852 }
853
854 if (!err)
855 ifr->ifr_ifru = ifrr.ifr_ifru;
856
857 return err;
858 }
859
860 /*
861 * macvlan network devices have devices nesting below it and are a special
862 * "super class" of normal network devices; split their locks off into a
863 * separate class since they always nest.
864 */
865 static struct lock_class_key macvlan_netdev_addr_lock_key;
866
867 #define ALWAYS_ON_OFFLOADS \
868 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
869 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
870
871 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
872
873 #define MACVLAN_FEATURES \
874 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
875 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
876 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
877 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
878
879 #define MACVLAN_STATE_MASK \
880 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
881
882 static void macvlan_set_lockdep_class(struct net_device *dev)
883 {
884 netdev_lockdep_set_classes(dev);
885 lockdep_set_class(&dev->addr_list_lock,
886 &macvlan_netdev_addr_lock_key);
887 }
888
889 static int macvlan_init(struct net_device *dev)
890 {
891 struct macvlan_dev *vlan = netdev_priv(dev);
892 const struct net_device *lowerdev = vlan->lowerdev;
893 struct macvlan_port *port = vlan->port;
894
895 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
896 (lowerdev->state & MACVLAN_STATE_MASK);
897 dev->features = lowerdev->features & MACVLAN_FEATURES;
898 dev->features |= ALWAYS_ON_FEATURES;
899 dev->hw_features |= NETIF_F_LRO;
900 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
901 dev->vlan_features |= ALWAYS_ON_OFFLOADS;
902 dev->hw_enc_features |= dev->features;
903 dev->gso_max_size = lowerdev->gso_max_size;
904 dev->gso_max_segs = lowerdev->gso_max_segs;
905 dev->hard_header_len = lowerdev->hard_header_len;
906 macvlan_set_lockdep_class(dev);
907
908 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
909 if (!vlan->pcpu_stats)
910 return -ENOMEM;
911
912 port->count += 1;
913
914 return 0;
915 }
916
917 static void macvlan_uninit(struct net_device *dev)
918 {
919 struct macvlan_dev *vlan = netdev_priv(dev);
920 struct macvlan_port *port = vlan->port;
921
922 free_percpu(vlan->pcpu_stats);
923
924 macvlan_flush_sources(port, vlan);
925 port->count -= 1;
926 if (!port->count)
927 macvlan_port_destroy(port->dev);
928 }
929
930 static void macvlan_dev_get_stats64(struct net_device *dev,
931 struct rtnl_link_stats64 *stats)
932 {
933 struct macvlan_dev *vlan = netdev_priv(dev);
934
935 if (vlan->pcpu_stats) {
936 struct vlan_pcpu_stats *p;
937 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
938 u32 rx_errors = 0, tx_dropped = 0;
939 unsigned int start;
940 int i;
941
942 for_each_possible_cpu(i) {
943 p = per_cpu_ptr(vlan->pcpu_stats, i);
944 do {
945 start = u64_stats_fetch_begin_irq(&p->syncp);
946 rx_packets = p->rx_packets;
947 rx_bytes = p->rx_bytes;
948 rx_multicast = p->rx_multicast;
949 tx_packets = p->tx_packets;
950 tx_bytes = p->tx_bytes;
951 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
952
953 stats->rx_packets += rx_packets;
954 stats->rx_bytes += rx_bytes;
955 stats->multicast += rx_multicast;
956 stats->tx_packets += tx_packets;
957 stats->tx_bytes += tx_bytes;
958 /* rx_errors & tx_dropped are u32, updated
959 * without syncp protection.
960 */
961 rx_errors += p->rx_errors;
962 tx_dropped += p->tx_dropped;
963 }
964 stats->rx_errors = rx_errors;
965 stats->rx_dropped = rx_errors;
966 stats->tx_dropped = tx_dropped;
967 }
968 }
969
970 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
971 __be16 proto, u16 vid)
972 {
973 struct macvlan_dev *vlan = netdev_priv(dev);
974 struct net_device *lowerdev = vlan->lowerdev;
975
976 return vlan_vid_add(lowerdev, proto, vid);
977 }
978
979 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
980 __be16 proto, u16 vid)
981 {
982 struct macvlan_dev *vlan = netdev_priv(dev);
983 struct net_device *lowerdev = vlan->lowerdev;
984
985 vlan_vid_del(lowerdev, proto, vid);
986 return 0;
987 }
988
989 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
990 struct net_device *dev,
991 const unsigned char *addr, u16 vid,
992 u16 flags,
993 struct netlink_ext_ack *extack)
994 {
995 struct macvlan_dev *vlan = netdev_priv(dev);
996 int err = -EINVAL;
997
998 /* Support unicast filter only on passthru devices.
999 * Multicast filter should be allowed on all devices.
1000 */
1001 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1002 return -EOPNOTSUPP;
1003
1004 if (flags & NLM_F_REPLACE)
1005 return -EOPNOTSUPP;
1006
1007 if (is_unicast_ether_addr(addr))
1008 err = dev_uc_add_excl(dev, addr);
1009 else if (is_multicast_ether_addr(addr))
1010 err = dev_mc_add_excl(dev, addr);
1011
1012 return err;
1013 }
1014
1015 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1016 struct net_device *dev,
1017 const unsigned char *addr, u16 vid)
1018 {
1019 struct macvlan_dev *vlan = netdev_priv(dev);
1020 int err = -EINVAL;
1021
1022 /* Support unicast filter only on passthru devices.
1023 * Multicast filter should be allowed on all devices.
1024 */
1025 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1026 return -EOPNOTSUPP;
1027
1028 if (is_unicast_ether_addr(addr))
1029 err = dev_uc_del(dev, addr);
1030 else if (is_multicast_ether_addr(addr))
1031 err = dev_mc_del(dev, addr);
1032
1033 return err;
1034 }
1035
1036 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1037 struct ethtool_drvinfo *drvinfo)
1038 {
1039 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1040 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1041 }
1042
1043 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1044 struct ethtool_link_ksettings *cmd)
1045 {
1046 const struct macvlan_dev *vlan = netdev_priv(dev);
1047
1048 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1049 }
1050
1051 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1052 struct ethtool_ts_info *info)
1053 {
1054 struct net_device *real_dev = macvlan_dev_real_dev(dev);
1055 const struct ethtool_ops *ops = real_dev->ethtool_ops;
1056 struct phy_device *phydev = real_dev->phydev;
1057
1058 if (phy_has_tsinfo(phydev)) {
1059 return phy_ts_info(phydev, info);
1060 } else if (ops->get_ts_info) {
1061 return ops->get_ts_info(real_dev, info);
1062 } else {
1063 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1064 SOF_TIMESTAMPING_SOFTWARE;
1065 info->phc_index = -1;
1066 }
1067
1068 return 0;
1069 }
1070
1071 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1072 netdev_features_t features)
1073 {
1074 struct macvlan_dev *vlan = netdev_priv(dev);
1075 netdev_features_t lowerdev_features = vlan->lowerdev->features;
1076 netdev_features_t mask;
1077
1078 features |= NETIF_F_ALL_FOR_ALL;
1079 features &= (vlan->set_features | ~MACVLAN_FEATURES);
1080 mask = features;
1081
1082 lowerdev_features &= (features | ~NETIF_F_LRO);
1083 features = netdev_increment_features(lowerdev_features, features, mask);
1084 features |= ALWAYS_ON_FEATURES;
1085 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1086
1087 return features;
1088 }
1089
1090 #ifdef CONFIG_NET_POLL_CONTROLLER
1091 static void macvlan_dev_poll_controller(struct net_device *dev)
1092 {
1093 return;
1094 }
1095
1096 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1097 {
1098 struct macvlan_dev *vlan = netdev_priv(dev);
1099 struct net_device *real_dev = vlan->lowerdev;
1100 struct netpoll *netpoll;
1101 int err;
1102
1103 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1104 err = -ENOMEM;
1105 if (!netpoll)
1106 goto out;
1107
1108 err = __netpoll_setup(netpoll, real_dev);
1109 if (err) {
1110 kfree(netpoll);
1111 goto out;
1112 }
1113
1114 vlan->netpoll = netpoll;
1115
1116 out:
1117 return err;
1118 }
1119
1120 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1121 {
1122 struct macvlan_dev *vlan = netdev_priv(dev);
1123 struct netpoll *netpoll = vlan->netpoll;
1124
1125 if (!netpoll)
1126 return;
1127
1128 vlan->netpoll = NULL;
1129
1130 __netpoll_free(netpoll);
1131 }
1132 #endif /* CONFIG_NET_POLL_CONTROLLER */
1133
1134 static int macvlan_dev_get_iflink(const struct net_device *dev)
1135 {
1136 struct macvlan_dev *vlan = netdev_priv(dev);
1137
1138 return vlan->lowerdev->ifindex;
1139 }
1140
1141 static const struct ethtool_ops macvlan_ethtool_ops = {
1142 .get_link = ethtool_op_get_link,
1143 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1144 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1145 .get_ts_info = macvlan_ethtool_get_ts_info,
1146 };
1147
1148 static const struct net_device_ops macvlan_netdev_ops = {
1149 .ndo_init = macvlan_init,
1150 .ndo_uninit = macvlan_uninit,
1151 .ndo_open = macvlan_open,
1152 .ndo_stop = macvlan_stop,
1153 .ndo_start_xmit = macvlan_start_xmit,
1154 .ndo_change_mtu = macvlan_change_mtu,
1155 .ndo_do_ioctl = macvlan_do_ioctl,
1156 .ndo_fix_features = macvlan_fix_features,
1157 .ndo_change_rx_flags = macvlan_change_rx_flags,
1158 .ndo_set_mac_address = macvlan_set_mac_address,
1159 .ndo_set_rx_mode = macvlan_set_mac_lists,
1160 .ndo_get_stats64 = macvlan_dev_get_stats64,
1161 .ndo_validate_addr = eth_validate_addr,
1162 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1163 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1164 .ndo_fdb_add = macvlan_fdb_add,
1165 .ndo_fdb_del = macvlan_fdb_del,
1166 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1167 #ifdef CONFIG_NET_POLL_CONTROLLER
1168 .ndo_poll_controller = macvlan_dev_poll_controller,
1169 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1170 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1171 #endif
1172 .ndo_get_iflink = macvlan_dev_get_iflink,
1173 .ndo_features_check = passthru_features_check,
1174 .ndo_change_proto_down = dev_change_proto_down_generic,
1175 };
1176
1177 void macvlan_common_setup(struct net_device *dev)
1178 {
1179 ether_setup(dev);
1180
1181 dev->min_mtu = 0;
1182 dev->max_mtu = ETH_MAX_MTU;
1183 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1184 netif_keep_dst(dev);
1185 dev->priv_flags |= IFF_UNICAST_FLT;
1186 dev->netdev_ops = &macvlan_netdev_ops;
1187 dev->needs_free_netdev = true;
1188 dev->header_ops = &macvlan_hard_header_ops;
1189 dev->ethtool_ops = &macvlan_ethtool_ops;
1190 }
1191 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1192
1193 static void macvlan_setup(struct net_device *dev)
1194 {
1195 macvlan_common_setup(dev);
1196 dev->priv_flags |= IFF_NO_QUEUE;
1197 }
1198
1199 static int macvlan_port_create(struct net_device *dev)
1200 {
1201 struct macvlan_port *port;
1202 unsigned int i;
1203 int err;
1204
1205 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1206 return -EINVAL;
1207
1208 if (netdev_is_rx_handler_busy(dev))
1209 return -EBUSY;
1210
1211 port = kzalloc(sizeof(*port), GFP_KERNEL);
1212 if (port == NULL)
1213 return -ENOMEM;
1214
1215 port->dev = dev;
1216 ether_addr_copy(port->perm_addr, dev->dev_addr);
1217 INIT_LIST_HEAD(&port->vlans);
1218 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1219 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1220 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1221 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1222
1223 port->bc_queue_len_used = 0;
1224 skb_queue_head_init(&port->bc_queue);
1225 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1226
1227 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1228 if (err)
1229 kfree(port);
1230 else
1231 dev->priv_flags |= IFF_MACVLAN_PORT;
1232 return err;
1233 }
1234
1235 static void macvlan_port_destroy(struct net_device *dev)
1236 {
1237 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1238 struct sk_buff *skb;
1239
1240 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1241 netdev_rx_handler_unregister(dev);
1242
1243 /* After this point, no packet can schedule bc_work anymore,
1244 * but we need to cancel it and purge left skbs if any.
1245 */
1246 cancel_work_sync(&port->bc_work);
1247
1248 while ((skb = __skb_dequeue(&port->bc_queue))) {
1249 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1250
1251 if (src)
1252 dev_put(src->dev);
1253
1254 kfree_skb(skb);
1255 }
1256
1257 /* If the lower device address has been changed by passthru
1258 * macvlan, put it back.
1259 */
1260 if (macvlan_passthru(port) &&
1261 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1262 struct sockaddr sa;
1263
1264 sa.sa_family = port->dev->type;
1265 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1266 dev_set_mac_address(port->dev, &sa, NULL);
1267 }
1268
1269 kfree(port);
1270 }
1271
1272 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1273 struct netlink_ext_ack *extack)
1274 {
1275 struct nlattr *nla, *head;
1276 int rem, len;
1277
1278 if (tb[IFLA_ADDRESS]) {
1279 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1280 return -EINVAL;
1281 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1282 return -EADDRNOTAVAIL;
1283 }
1284
1285 if (!data)
1286 return 0;
1287
1288 if (data[IFLA_MACVLAN_FLAGS] &&
1289 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1290 return -EINVAL;
1291
1292 if (data[IFLA_MACVLAN_MODE]) {
1293 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1294 case MACVLAN_MODE_PRIVATE:
1295 case MACVLAN_MODE_VEPA:
1296 case MACVLAN_MODE_BRIDGE:
1297 case MACVLAN_MODE_PASSTHRU:
1298 case MACVLAN_MODE_SOURCE:
1299 break;
1300 default:
1301 return -EINVAL;
1302 }
1303 }
1304
1305 if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1306 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1307 case MACVLAN_MACADDR_ADD:
1308 case MACVLAN_MACADDR_DEL:
1309 case MACVLAN_MACADDR_FLUSH:
1310 case MACVLAN_MACADDR_SET:
1311 break;
1312 default:
1313 return -EINVAL;
1314 }
1315 }
1316
1317 if (data[IFLA_MACVLAN_MACADDR]) {
1318 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1319 return -EINVAL;
1320
1321 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1322 return -EADDRNOTAVAIL;
1323 }
1324
1325 if (data[IFLA_MACVLAN_MACADDR_DATA]) {
1326 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1327 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1328
1329 nla_for_each_attr(nla, head, len, rem) {
1330 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1331 nla_len(nla) != ETH_ALEN)
1332 return -EINVAL;
1333
1334 if (!is_valid_ether_addr(nla_data(nla)))
1335 return -EADDRNOTAVAIL;
1336 }
1337 }
1338
1339 if (data[IFLA_MACVLAN_MACADDR_COUNT])
1340 return -EINVAL;
1341
1342 return 0;
1343 }
1344
1345 /*
1346 * reconfigure list of remote source mac address
1347 * (only for macvlan devices in source mode)
1348 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1349 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1350 */
1351 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1352 struct nlattr *data[])
1353 {
1354 char *addr = NULL;
1355 int ret, rem, len;
1356 struct nlattr *nla, *head;
1357 struct macvlan_source_entry *entry;
1358
1359 if (data[IFLA_MACVLAN_MACADDR])
1360 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1361
1362 if (mode == MACVLAN_MACADDR_ADD) {
1363 if (!addr)
1364 return -EINVAL;
1365
1366 return macvlan_hash_add_source(vlan, addr);
1367
1368 } else if (mode == MACVLAN_MACADDR_DEL) {
1369 if (!addr)
1370 return -EINVAL;
1371
1372 entry = macvlan_hash_lookup_source(vlan, addr);
1373 if (entry) {
1374 macvlan_hash_del_source(entry);
1375 vlan->macaddr_count--;
1376 }
1377 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1378 macvlan_flush_sources(vlan->port, vlan);
1379 } else if (mode == MACVLAN_MACADDR_SET) {
1380 macvlan_flush_sources(vlan->port, vlan);
1381
1382 if (addr) {
1383 ret = macvlan_hash_add_source(vlan, addr);
1384 if (ret)
1385 return ret;
1386 }
1387
1388 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1389 return 0;
1390
1391 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1392 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1393
1394 nla_for_each_attr(nla, head, len, rem) {
1395 addr = nla_data(nla);
1396 ret = macvlan_hash_add_source(vlan, addr);
1397 if (ret)
1398 return ret;
1399 }
1400 } else {
1401 return -EINVAL;
1402 }
1403
1404 return 0;
1405 }
1406
1407 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1408 struct nlattr *tb[], struct nlattr *data[],
1409 struct netlink_ext_ack *extack)
1410 {
1411 struct macvlan_dev *vlan = netdev_priv(dev);
1412 struct macvlan_port *port;
1413 struct net_device *lowerdev;
1414 int err;
1415 int macmode;
1416 bool create = false;
1417
1418 if (!tb[IFLA_LINK])
1419 return -EINVAL;
1420
1421 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1422 if (lowerdev == NULL)
1423 return -ENODEV;
1424
1425 /* When creating macvlans or macvtaps on top of other macvlans - use
1426 * the real device as the lowerdev.
1427 */
1428 if (netif_is_macvlan(lowerdev))
1429 lowerdev = macvlan_dev_real_dev(lowerdev);
1430
1431 if (!tb[IFLA_MTU])
1432 dev->mtu = lowerdev->mtu;
1433 else if (dev->mtu > lowerdev->mtu)
1434 return -EINVAL;
1435
1436 /* MTU range: 68 - lowerdev->max_mtu */
1437 dev->min_mtu = ETH_MIN_MTU;
1438 dev->max_mtu = lowerdev->max_mtu;
1439
1440 if (!tb[IFLA_ADDRESS])
1441 eth_hw_addr_random(dev);
1442
1443 if (!netif_is_macvlan_port(lowerdev)) {
1444 err = macvlan_port_create(lowerdev);
1445 if (err < 0)
1446 return err;
1447 create = true;
1448 }
1449 port = macvlan_port_get_rtnl(lowerdev);
1450
1451 /* Only 1 macvlan device can be created in passthru mode */
1452 if (macvlan_passthru(port)) {
1453 /* The macvlan port must be not created this time,
1454 * still goto destroy_macvlan_port for readability.
1455 */
1456 err = -EINVAL;
1457 goto destroy_macvlan_port;
1458 }
1459
1460 vlan->lowerdev = lowerdev;
1461 vlan->dev = dev;
1462 vlan->port = port;
1463 vlan->set_features = MACVLAN_FEATURES;
1464
1465 vlan->mode = MACVLAN_MODE_VEPA;
1466 if (data && data[IFLA_MACVLAN_MODE])
1467 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1468
1469 if (data && data[IFLA_MACVLAN_FLAGS])
1470 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1471
1472 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1473 if (port->count) {
1474 err = -EINVAL;
1475 goto destroy_macvlan_port;
1476 }
1477 macvlan_set_passthru(port);
1478 eth_hw_addr_inherit(dev, lowerdev);
1479 }
1480
1481 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1482 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1483 err = -EINVAL;
1484 goto destroy_macvlan_port;
1485 }
1486 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1487 err = macvlan_changelink_sources(vlan, macmode, data);
1488 if (err)
1489 goto destroy_macvlan_port;
1490 }
1491
1492 vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN;
1493 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN])
1494 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1495
1496 err = register_netdevice(dev);
1497 if (err < 0)
1498 goto destroy_macvlan_port;
1499
1500 dev->priv_flags |= IFF_MACVLAN;
1501 err = netdev_upper_dev_link(lowerdev, dev, extack);
1502 if (err)
1503 goto unregister_netdev;
1504
1505 list_add_tail_rcu(&vlan->list, &port->vlans);
1506 update_port_bc_queue_len(vlan->port);
1507 netif_stacked_transfer_operstate(lowerdev, dev);
1508 linkwatch_fire_event(dev);
1509
1510 return 0;
1511
1512 unregister_netdev:
1513 /* macvlan_uninit would free the macvlan port */
1514 unregister_netdevice(dev);
1515 return err;
1516 destroy_macvlan_port:
1517 /* the macvlan port may be freed by macvlan_uninit when fail to register.
1518 * so we destroy the macvlan port only when it's valid.
1519 */
1520 if (create && macvlan_port_get_rtnl(lowerdev))
1521 macvlan_port_destroy(port->dev);
1522 return err;
1523 }
1524 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1525
1526 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1527 struct nlattr *tb[], struct nlattr *data[],
1528 struct netlink_ext_ack *extack)
1529 {
1530 return macvlan_common_newlink(src_net, dev, tb, data, extack);
1531 }
1532
1533 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1534 {
1535 struct macvlan_dev *vlan = netdev_priv(dev);
1536
1537 if (vlan->mode == MACVLAN_MODE_SOURCE)
1538 macvlan_flush_sources(vlan->port, vlan);
1539 list_del_rcu(&vlan->list);
1540 update_port_bc_queue_len(vlan->port);
1541 unregister_netdevice_queue(dev, head);
1542 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1543 }
1544 EXPORT_SYMBOL_GPL(macvlan_dellink);
1545
1546 static int macvlan_changelink(struct net_device *dev,
1547 struct nlattr *tb[], struct nlattr *data[],
1548 struct netlink_ext_ack *extack)
1549 {
1550 struct macvlan_dev *vlan = netdev_priv(dev);
1551 enum macvlan_mode mode;
1552 bool set_mode = false;
1553 enum macvlan_macaddr_mode macmode;
1554 int ret;
1555
1556 /* Validate mode, but don't set yet: setting flags may fail. */
1557 if (data && data[IFLA_MACVLAN_MODE]) {
1558 set_mode = true;
1559 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1560 /* Passthrough mode can't be set or cleared dynamically */
1561 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1562 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1563 return -EINVAL;
1564 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1565 vlan->mode != mode)
1566 macvlan_flush_sources(vlan->port, vlan);
1567 }
1568
1569 if (data && data[IFLA_MACVLAN_FLAGS]) {
1570 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1571 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1572 if (macvlan_passthru(vlan->port) && promisc) {
1573 int err;
1574
1575 if (flags & MACVLAN_FLAG_NOPROMISC)
1576 err = dev_set_promiscuity(vlan->lowerdev, -1);
1577 else
1578 err = dev_set_promiscuity(vlan->lowerdev, 1);
1579 if (err < 0)
1580 return err;
1581 }
1582 vlan->flags = flags;
1583 }
1584
1585 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) {
1586 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1587 update_port_bc_queue_len(vlan->port);
1588 }
1589
1590 if (set_mode)
1591 vlan->mode = mode;
1592 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1593 if (vlan->mode != MACVLAN_MODE_SOURCE)
1594 return -EINVAL;
1595 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1596 ret = macvlan_changelink_sources(vlan, macmode, data);
1597 if (ret)
1598 return ret;
1599 }
1600 return 0;
1601 }
1602
1603 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1604 {
1605 if (vlan->macaddr_count == 0)
1606 return 0;
1607 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1608 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1609 }
1610
1611 static size_t macvlan_get_size(const struct net_device *dev)
1612 {
1613 struct macvlan_dev *vlan = netdev_priv(dev);
1614
1615 return (0
1616 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1617 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1618 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1619 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1620 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */
1621 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */
1622 );
1623 }
1624
1625 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1626 const struct macvlan_dev *vlan,
1627 const int i)
1628 {
1629 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1630 struct macvlan_source_entry *entry;
1631
1632 hlist_for_each_entry_rcu(entry, h, hlist) {
1633 if (entry->vlan != vlan)
1634 continue;
1635 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1636 return 1;
1637 }
1638 return 0;
1639 }
1640
1641 static int macvlan_fill_info(struct sk_buff *skb,
1642 const struct net_device *dev)
1643 {
1644 struct macvlan_dev *vlan = netdev_priv(dev);
1645 struct macvlan_port *port = vlan->port;
1646 int i;
1647 struct nlattr *nest;
1648
1649 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1650 goto nla_put_failure;
1651 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1652 goto nla_put_failure;
1653 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1654 goto nla_put_failure;
1655 if (vlan->macaddr_count > 0) {
1656 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1657 if (nest == NULL)
1658 goto nla_put_failure;
1659
1660 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1661 if (macvlan_fill_info_macaddr(skb, vlan, i))
1662 goto nla_put_failure;
1663 }
1664 nla_nest_end(skb, nest);
1665 }
1666 if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, vlan->bc_queue_len_req))
1667 goto nla_put_failure;
1668 if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, port->bc_queue_len_used))
1669 goto nla_put_failure;
1670 return 0;
1671
1672 nla_put_failure:
1673 return -EMSGSIZE;
1674 }
1675
1676 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1677 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1678 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1679 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1680 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1681 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1682 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1683 [IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 },
1684 [IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT },
1685 };
1686
1687 int macvlan_link_register(struct rtnl_link_ops *ops)
1688 {
1689 /* common fields */
1690 ops->validate = macvlan_validate;
1691 ops->maxtype = IFLA_MACVLAN_MAX;
1692 ops->policy = macvlan_policy;
1693 ops->changelink = macvlan_changelink;
1694 ops->get_size = macvlan_get_size;
1695 ops->fill_info = macvlan_fill_info;
1696
1697 return rtnl_link_register(ops);
1698 };
1699 EXPORT_SYMBOL_GPL(macvlan_link_register);
1700
1701 static struct net *macvlan_get_link_net(const struct net_device *dev)
1702 {
1703 return dev_net(macvlan_dev_real_dev(dev));
1704 }
1705
1706 static struct rtnl_link_ops macvlan_link_ops = {
1707 .kind = "macvlan",
1708 .setup = macvlan_setup,
1709 .newlink = macvlan_newlink,
1710 .dellink = macvlan_dellink,
1711 .get_link_net = macvlan_get_link_net,
1712 .priv_size = sizeof(struct macvlan_dev),
1713 };
1714
1715 static void update_port_bc_queue_len(struct macvlan_port *port)
1716 {
1717 u32 max_bc_queue_len_req = 0;
1718 struct macvlan_dev *vlan;
1719
1720 list_for_each_entry(vlan, &port->vlans, list) {
1721 if (vlan->bc_queue_len_req > max_bc_queue_len_req)
1722 max_bc_queue_len_req = vlan->bc_queue_len_req;
1723 }
1724 port->bc_queue_len_used = max_bc_queue_len_req;
1725 }
1726
1727 static int macvlan_device_event(struct notifier_block *unused,
1728 unsigned long event, void *ptr)
1729 {
1730 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1731 struct macvlan_dev *vlan, *next;
1732 struct macvlan_port *port;
1733 LIST_HEAD(list_kill);
1734
1735 if (!netif_is_macvlan_port(dev))
1736 return NOTIFY_DONE;
1737
1738 port = macvlan_port_get_rtnl(dev);
1739
1740 switch (event) {
1741 case NETDEV_UP:
1742 case NETDEV_DOWN:
1743 case NETDEV_CHANGE:
1744 list_for_each_entry(vlan, &port->vlans, list)
1745 netif_stacked_transfer_operstate(vlan->lowerdev,
1746 vlan->dev);
1747 break;
1748 case NETDEV_FEAT_CHANGE:
1749 list_for_each_entry(vlan, &port->vlans, list) {
1750 vlan->dev->gso_max_size = dev->gso_max_size;
1751 vlan->dev->gso_max_segs = dev->gso_max_segs;
1752 netdev_update_features(vlan->dev);
1753 }
1754 break;
1755 case NETDEV_CHANGEMTU:
1756 list_for_each_entry(vlan, &port->vlans, list) {
1757 if (vlan->dev->mtu <= dev->mtu)
1758 continue;
1759 dev_set_mtu(vlan->dev, dev->mtu);
1760 }
1761 break;
1762 case NETDEV_CHANGEADDR:
1763 if (!macvlan_passthru(port))
1764 return NOTIFY_DONE;
1765
1766 vlan = list_first_entry_or_null(&port->vlans,
1767 struct macvlan_dev,
1768 list);
1769
1770 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
1771 return NOTIFY_BAD;
1772
1773 break;
1774 case NETDEV_UNREGISTER:
1775 /* twiddle thumbs on netns device moves */
1776 if (dev->reg_state != NETREG_UNREGISTERING)
1777 break;
1778
1779 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1780 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1781 unregister_netdevice_many(&list_kill);
1782 break;
1783 case NETDEV_PRE_TYPE_CHANGE:
1784 /* Forbid underlaying device to change its type. */
1785 return NOTIFY_BAD;
1786
1787 case NETDEV_NOTIFY_PEERS:
1788 case NETDEV_BONDING_FAILOVER:
1789 case NETDEV_RESEND_IGMP:
1790 /* Propagate to all vlans */
1791 list_for_each_entry(vlan, &port->vlans, list)
1792 call_netdevice_notifiers(event, vlan->dev);
1793 }
1794 return NOTIFY_DONE;
1795 }
1796
1797 static struct notifier_block macvlan_notifier_block __read_mostly = {
1798 .notifier_call = macvlan_device_event,
1799 };
1800
1801 static int __init macvlan_init_module(void)
1802 {
1803 int err;
1804
1805 register_netdevice_notifier(&macvlan_notifier_block);
1806
1807 err = macvlan_link_register(&macvlan_link_ops);
1808 if (err < 0)
1809 goto err1;
1810 return 0;
1811 err1:
1812 unregister_netdevice_notifier(&macvlan_notifier_block);
1813 return err;
1814 }
1815
1816 static void __exit macvlan_cleanup_module(void)
1817 {
1818 rtnl_link_unregister(&macvlan_link_ops);
1819 unregister_netdevice_notifier(&macvlan_notifier_block);
1820 }
1821
1822 module_init(macvlan_init_module);
1823 module_exit(macvlan_cleanup_module);
1824
1825 MODULE_LICENSE("GPL");
1826 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1827 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1828 MODULE_ALIAS_RTNL_LINK("macvlan");
Linux with added FPC-III support