?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
drm/panel-edp: Add STA 116QHD024002
[drm/drm-misc.git] / drivers / net / macvlan.c
blobfed4fe2a4748f8f6b69a094dbe0362752da4699b
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 int bc_cutoff;
51 u32 flags;
52 int count;
53 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
54 DECLARE_BITMAP(bc_filter, MACVLAN_MC_FILTER_SZ);
55 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
56 unsigned char perm_addr[ETH_ALEN];
57 };
58
59 struct macvlan_source_entry {
60 struct hlist_node hlist;
61 struct macvlan_dev *vlan;
62 unsigned char addr[6+2] __aligned(sizeof(u16));
63 struct rcu_head rcu;
64 };
65
66 struct macvlan_skb_cb {
67 const struct macvlan_dev *src;
68 };
69
70 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
71
72 static void macvlan_port_destroy(struct net_device *dev);
73 static void update_port_bc_queue_len(struct macvlan_port *port);
74
75 static inline bool macvlan_passthru(const struct macvlan_port *port)
76 {
77 return port->flags & MACVLAN_F_PASSTHRU;
78 }
79
80 static inline void macvlan_set_passthru(struct macvlan_port *port)
81 {
82 port->flags |= MACVLAN_F_PASSTHRU;
83 }
84
85 static inline bool macvlan_addr_change(const struct macvlan_port *port)
86 {
87 return port->flags & MACVLAN_F_ADDRCHANGE;
88 }
89
90 static inline void macvlan_set_addr_change(struct macvlan_port *port)
91 {
92 port->flags |= MACVLAN_F_ADDRCHANGE;
93 }
94
95 static inline void macvlan_clear_addr_change(struct macvlan_port *port)
96 {
97 port->flags &= ~MACVLAN_F_ADDRCHANGE;
98 }
99
100 /* Hash Ethernet address */
101 static u32 macvlan_eth_hash(const unsigned char *addr)
102 {
103 u64 value = get_unaligned((u64 *)addr);
104
105 /* only want 6 bytes */
106 #ifdef __BIG_ENDIAN
107 value >>= 16;
108 #else
109 value <<= 16;
110 #endif
111 return hash_64(value, MACVLAN_HASH_BITS);
112 }
113
114 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
115 {
116 return rcu_dereference(dev->rx_handler_data);
117 }
118
119 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
120 {
121 return rtnl_dereference(dev->rx_handler_data);
122 }
123
124 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
125 const unsigned char *addr)
126 {
127 struct macvlan_dev *vlan;
128 u32 idx = macvlan_eth_hash(addr);
129
130 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist,
131 lockdep_rtnl_is_held()) {
132 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
133 return vlan;
134 }
135 return NULL;
136 }
137
138 static struct macvlan_source_entry *macvlan_hash_lookup_source(
139 const struct macvlan_dev *vlan,
140 const unsigned char *addr)
141 {
142 struct macvlan_source_entry *entry;
143 u32 idx = macvlan_eth_hash(addr);
144 struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
145
146 hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) {
147 if (ether_addr_equal_64bits(entry->addr, addr) &&
148 entry->vlan == vlan)
149 return entry;
150 }
151 return NULL;
152 }
153
154 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
155 const unsigned char *addr)
156 {
157 struct macvlan_port *port = vlan->port;
158 struct macvlan_source_entry *entry;
159 struct hlist_head *h;
160
161 entry = macvlan_hash_lookup_source(vlan, addr);
162 if (entry)
163 return 0;
164
165 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
166 if (!entry)
167 return -ENOMEM;
168
169 ether_addr_copy(entry->addr, addr);
170 entry->vlan = vlan;
171 h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
172 hlist_add_head_rcu(&entry->hlist, h);
173 vlan->macaddr_count++;
174
175 return 0;
176 }
177
178 static void macvlan_hash_add(struct macvlan_dev *vlan)
179 {
180 struct macvlan_port *port = vlan->port;
181 const unsigned char *addr = vlan->dev->dev_addr;
182 u32 idx = macvlan_eth_hash(addr);
183
184 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
185 }
186
187 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
188 {
189 hlist_del_rcu(&entry->hlist);
190 kfree_rcu(entry, rcu);
191 }
192
193 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
194 {
195 hlist_del_rcu(&vlan->hlist);
196 if (sync)
197 synchronize_rcu();
198 }
199
200 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
201 const unsigned char *addr)
202 {
203 macvlan_hash_del(vlan, true);
204 /* Now that we are unhashed it is safe to change the device
205 * address without confusing packet delivery.
206 */
207 eth_hw_addr_set(vlan->dev, addr);
208 macvlan_hash_add(vlan);
209 }
210
211 static bool macvlan_addr_busy(const struct macvlan_port *port,
212 const unsigned char *addr)
213 {
214 /* Test to see if the specified address is
215 * currently in use by the underlying device or
216 * another macvlan.
217 */
218 if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
219 ether_addr_equal_64bits(port->dev->dev_addr, addr))
220 return true;
221
222 if (macvlan_hash_lookup(port, addr))
223 return true;
224
225 return false;
226 }
227
228
229 static int macvlan_broadcast_one(struct sk_buff *skb,
230 const struct macvlan_dev *vlan,
231 const struct ethhdr *eth, bool local)
232 {
233 struct net_device *dev = vlan->dev;
234
235 if (local)
236 return __dev_forward_skb(dev, skb);
237
238 skb->dev = dev;
239 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
240 skb->pkt_type = PACKET_BROADCAST;
241 else
242 skb->pkt_type = PACKET_MULTICAST;
243
244 return 0;
245 }
246
247 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
248 {
249 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
250 }
251
252
253 static unsigned int mc_hash(const struct macvlan_dev *vlan,
254 const unsigned char *addr)
255 {
256 u32 val = __get_unaligned_cpu32(addr + 2);
257
258 val ^= macvlan_hash_mix(vlan);
259 return hash_32(val, MACVLAN_MC_FILTER_BITS);
260 }
261
262 static void macvlan_broadcast(struct sk_buff *skb,
263 const struct macvlan_port *port,
264 struct net_device *src,
265 enum macvlan_mode mode)
266 {
267 const struct ethhdr *eth = eth_hdr(skb);
268 const struct macvlan_dev *vlan;
269 struct sk_buff *nskb;
270 unsigned int i;
271 int err;
272 unsigned int hash;
273
274 if (skb->protocol == htons(ETH_P_PAUSE))
275 return;
276
277 hash_for_each_rcu(port->vlan_hash, i, vlan, hlist) {
278 if (vlan->dev == src || !(vlan->mode & mode))
279 continue;
280
281 hash = mc_hash(vlan, eth->h_dest);
282 if (!test_bit(hash, vlan->mc_filter))
283 continue;
284
285 err = NET_RX_DROP;
286 nskb = skb_clone(skb, GFP_ATOMIC);
287 if (likely(nskb))
288 err = macvlan_broadcast_one(nskb, vlan, eth,
289 mode == MACVLAN_MODE_BRIDGE) ?:
290 netif_rx(nskb);
291 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
292 err == NET_RX_SUCCESS, true);
293 }
294 }
295
296 static void macvlan_multicast_rx(const struct macvlan_port *port,
297 const struct macvlan_dev *src,
298 struct sk_buff *skb)
299 {
300 if (!src)
301 /* frame comes from an external address */
302 macvlan_broadcast(skb, port, NULL,
303 MACVLAN_MODE_PRIVATE |
304 MACVLAN_MODE_VEPA |
305 MACVLAN_MODE_PASSTHRU|
306 MACVLAN_MODE_BRIDGE);
307 else if (src->mode == MACVLAN_MODE_VEPA)
308 /* flood to everyone except source */
309 macvlan_broadcast(skb, port, src->dev,
310 MACVLAN_MODE_VEPA |
311 MACVLAN_MODE_BRIDGE);
312 else
313 /*
314 * flood only to VEPA ports, bridge ports
315 * already saw the frame on the way out.
316 */
317 macvlan_broadcast(skb, port, src->dev,
318 MACVLAN_MODE_VEPA);
319 }
320
321 static void macvlan_process_broadcast(struct work_struct *w)
322 {
323 struct macvlan_port *port = container_of(w, struct macvlan_port,
324 bc_work);
325 struct sk_buff *skb;
326 struct sk_buff_head list;
327
328 __skb_queue_head_init(&list);
329
330 spin_lock_bh(&port->bc_queue.lock);
331 skb_queue_splice_tail_init(&port->bc_queue, &list);
332 spin_unlock_bh(&port->bc_queue.lock);
333
334 while ((skb = __skb_dequeue(&list))) {
335 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
336
337 rcu_read_lock();
338 macvlan_multicast_rx(port, src, skb);
339 rcu_read_unlock();
340
341 if (src)
342 dev_put(src->dev);
343 consume_skb(skb);
344
345 cond_resched();
346 }
347 }
348
349 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
350 const struct macvlan_dev *src,
351 struct sk_buff *skb)
352 {
353 struct sk_buff *nskb;
354 int err = -ENOMEM;
355
356 nskb = skb_clone(skb, GFP_ATOMIC);
357 if (!nskb)
358 goto err;
359
360 MACVLAN_SKB_CB(nskb)->src = src;
361
362 spin_lock(&port->bc_queue.lock);
363 if (skb_queue_len(&port->bc_queue) < port->bc_queue_len_used) {
364 if (src)
365 dev_hold(src->dev);
366 __skb_queue_tail(&port->bc_queue, nskb);
367 err = 0;
368 }
369 spin_unlock(&port->bc_queue.lock);
370
371 queue_work(system_unbound_wq, &port->bc_work);
372
373 if (err)
374 goto free_nskb;
375
376 return;
377
378 free_nskb:
379 kfree_skb(nskb);
380 err:
381 dev_core_stats_rx_dropped_inc(skb->dev);
382 }
383
384 static void macvlan_flush_sources(struct macvlan_port *port,
385 struct macvlan_dev *vlan)
386 {
387 struct macvlan_source_entry *entry;
388 struct hlist_node *next;
389 int i;
390
391 hash_for_each_safe(port->vlan_source_hash, i, next, entry, hlist)
392 if (entry->vlan == vlan)
393 macvlan_hash_del_source(entry);
394
395 vlan->macaddr_count = 0;
396 }
397
398 static void macvlan_forward_source_one(struct sk_buff *skb,
399 struct macvlan_dev *vlan)
400 {
401 struct sk_buff *nskb;
402 struct net_device *dev;
403 int len;
404 int ret;
405
406 dev = vlan->dev;
407 if (unlikely(!(dev->flags & IFF_UP)))
408 return;
409
410 nskb = skb_clone(skb, GFP_ATOMIC);
411 if (!nskb)
412 return;
413
414 len = nskb->len + ETH_HLEN;
415 nskb->dev = dev;
416
417 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
418 nskb->pkt_type = PACKET_HOST;
419
420 ret = __netif_rx(nskb);
421 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
422 }
423
424 static bool macvlan_forward_source(struct sk_buff *skb,
425 struct macvlan_port *port,
426 const unsigned char *addr)
427 {
428 struct macvlan_source_entry *entry;
429 u32 idx = macvlan_eth_hash(addr);
430 struct hlist_head *h = &port->vlan_source_hash[idx];
431 bool consume = false;
432
433 hlist_for_each_entry_rcu(entry, h, hlist) {
434 if (ether_addr_equal_64bits(entry->addr, addr)) {
435 if (entry->vlan->flags & MACVLAN_FLAG_NODST)
436 consume = true;
437 macvlan_forward_source_one(skb, entry->vlan);
438 }
439 }
440
441 return consume;
442 }
443
444 /* called under rcu_read_lock() from netif_receive_skb */
445 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
446 {
447 struct macvlan_port *port;
448 struct sk_buff *skb = *pskb;
449 const struct ethhdr *eth = eth_hdr(skb);
450 const struct macvlan_dev *vlan;
451 const struct macvlan_dev *src;
452 struct net_device *dev;
453 unsigned int len = 0;
454 int ret;
455 rx_handler_result_t handle_res;
456
457 /* Packets from dev_loopback_xmit() do not have L2 header, bail out */
458 if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
459 return RX_HANDLER_PASS;
460
461 port = macvlan_port_get_rcu(skb->dev);
462 if (is_multicast_ether_addr(eth->h_dest)) {
463 unsigned int hash;
464
465 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
466 if (!skb)
467 return RX_HANDLER_CONSUMED;
468 *pskb = skb;
469 eth = eth_hdr(skb);
470 if (macvlan_forward_source(skb, port, eth->h_source)) {
471 kfree_skb(skb);
472 return RX_HANDLER_CONSUMED;
473 }
474 src = macvlan_hash_lookup(port, eth->h_source);
475 if (src && src->mode != MACVLAN_MODE_VEPA &&
476 src->mode != MACVLAN_MODE_BRIDGE) {
477 /* forward to original port. */
478 vlan = src;
479 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
480 __netif_rx(skb);
481 handle_res = RX_HANDLER_CONSUMED;
482 goto out;
483 }
484
485 hash = mc_hash(NULL, eth->h_dest);
486 if (test_bit(hash, port->bc_filter))
487 macvlan_broadcast_enqueue(port, src, skb);
488 else if (test_bit(hash, port->mc_filter))
489 macvlan_multicast_rx(port, src, skb);
490
491 return RX_HANDLER_PASS;
492 }
493
494 if (macvlan_forward_source(skb, port, eth->h_source)) {
495 kfree_skb(skb);
496 return RX_HANDLER_CONSUMED;
497 }
498 if (macvlan_passthru(port))
499 vlan = list_first_or_null_rcu(&port->vlans,
500 struct macvlan_dev, list);
501 else
502 vlan = macvlan_hash_lookup(port, eth->h_dest);
503 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
504 return RX_HANDLER_PASS;
505
506 dev = vlan->dev;
507 if (unlikely(!(dev->flags & IFF_UP))) {
508 kfree_skb(skb);
509 return RX_HANDLER_CONSUMED;
510 }
511 len = skb->len + ETH_HLEN;
512 skb = skb_share_check(skb, GFP_ATOMIC);
513 if (!skb) {
514 ret = NET_RX_DROP;
515 handle_res = RX_HANDLER_CONSUMED;
516 goto out;
517 }
518
519 *pskb = skb;
520 skb->dev = dev;
521 skb->pkt_type = PACKET_HOST;
522
523 ret = NET_RX_SUCCESS;
524 handle_res = RX_HANDLER_ANOTHER;
525 out:
526 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
527 return handle_res;
528 }
529
530 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
531 {
532 const struct macvlan_dev *vlan = netdev_priv(dev);
533 const struct macvlan_port *port = vlan->port;
534 const struct macvlan_dev *dest;
535
536 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
537 const struct ethhdr *eth = skb_eth_hdr(skb);
538
539 /* send to other bridge ports directly */
540 if (is_multicast_ether_addr(eth->h_dest)) {
541 skb_reset_mac_header(skb);
542 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
543 goto xmit_world;
544 }
545
546 dest = macvlan_hash_lookup(port, eth->h_dest);
547 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
548 /* send to lowerdev first for its network taps */
549 dev_forward_skb(vlan->lowerdev, skb);
550
551 return NET_XMIT_SUCCESS;
552 }
553 }
554 xmit_world:
555 skb->dev = vlan->lowerdev;
556 return dev_queue_xmit_accel(skb,
557 netdev_get_sb_channel(dev) ? dev : NULL);
558 }
559
560 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
561 {
562 #ifdef CONFIG_NET_POLL_CONTROLLER
563 return netpoll_send_skb(vlan->netpoll, skb);
564 #else
565 BUG();
566 return NETDEV_TX_OK;
567 #endif
568 }
569
570 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
571 struct net_device *dev)
572 {
573 struct macvlan_dev *vlan = netdev_priv(dev);
574 unsigned int len = skb->len;
575 int ret;
576
577 if (unlikely(netpoll_tx_running(dev)))
578 return macvlan_netpoll_send_skb(vlan, skb);
579
580 ret = macvlan_queue_xmit(skb, dev);
581
582 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
583 struct vlan_pcpu_stats *pcpu_stats;
584
585 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
586 u64_stats_update_begin(&pcpu_stats->syncp);
587 u64_stats_inc(&pcpu_stats->tx_packets);
588 u64_stats_add(&pcpu_stats->tx_bytes, len);
589 u64_stats_update_end(&pcpu_stats->syncp);
590 } else {
591 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
592 }
593 return ret;
594 }
595
596 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
597 unsigned short type, const void *daddr,
598 const void *saddr, unsigned len)
599 {
600 const struct macvlan_dev *vlan = netdev_priv(dev);
601 struct net_device *lowerdev = vlan->lowerdev;
602
603 return dev_hard_header(skb, lowerdev, type, daddr,
604 saddr ? : dev->dev_addr, len);
605 }
606
607 static const struct header_ops macvlan_hard_header_ops = {
608 .create = macvlan_hard_header,
609 .parse = eth_header_parse,
610 .cache = eth_header_cache,
611 .cache_update = eth_header_cache_update,
612 .parse_protocol = eth_header_parse_protocol,
613 };
614
615 static int macvlan_open(struct net_device *dev)
616 {
617 struct macvlan_dev *vlan = netdev_priv(dev);
618 struct net_device *lowerdev = vlan->lowerdev;
619 int err;
620
621 if (macvlan_passthru(vlan->port)) {
622 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
623 err = dev_set_promiscuity(lowerdev, 1);
624 if (err < 0)
625 goto out;
626 }
627 goto hash_add;
628 }
629
630 err = -EADDRINUSE;
631 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
632 goto out;
633
634 /* Attempt to populate accel_priv which is used to offload the L2
635 * forwarding requests for unicast packets.
636 */
637 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
638 vlan->accel_priv =
639 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
640
641 /* If earlier attempt to offload failed, or accel_priv is not
642 * populated we must add the unicast address to the lower device.
643 */
644 if (IS_ERR_OR_NULL(vlan->accel_priv)) {
645 vlan->accel_priv = NULL;
646 err = dev_uc_add(lowerdev, dev->dev_addr);
647 if (err < 0)
648 goto out;
649 }
650
651 if (dev->flags & IFF_ALLMULTI) {
652 err = dev_set_allmulti(lowerdev, 1);
653 if (err < 0)
654 goto del_unicast;
655 }
656
657 if (dev->flags & IFF_PROMISC) {
658 err = dev_set_promiscuity(lowerdev, 1);
659 if (err < 0)
660 goto clear_multi;
661 }
662
663 hash_add:
664 macvlan_hash_add(vlan);
665 return 0;
666
667 clear_multi:
668 if (dev->flags & IFF_ALLMULTI)
669 dev_set_allmulti(lowerdev, -1);
670 del_unicast:
671 if (vlan->accel_priv) {
672 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
673 vlan->accel_priv);
674 vlan->accel_priv = NULL;
675 } else {
676 dev_uc_del(lowerdev, dev->dev_addr);
677 }
678 out:
679 return err;
680 }
681
682 static int macvlan_stop(struct net_device *dev)
683 {
684 struct macvlan_dev *vlan = netdev_priv(dev);
685 struct net_device *lowerdev = vlan->lowerdev;
686
687 if (vlan->accel_priv) {
688 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
689 vlan->accel_priv);
690 vlan->accel_priv = NULL;
691 }
692
693 dev_uc_unsync(lowerdev, dev);
694 dev_mc_unsync(lowerdev, dev);
695
696 if (macvlan_passthru(vlan->port)) {
697 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
698 dev_set_promiscuity(lowerdev, -1);
699 goto hash_del;
700 }
701
702 if (dev->flags & IFF_ALLMULTI)
703 dev_set_allmulti(lowerdev, -1);
704
705 if (dev->flags & IFF_PROMISC)
706 dev_set_promiscuity(lowerdev, -1);
707
708 dev_uc_del(lowerdev, dev->dev_addr);
709
710 hash_del:
711 macvlan_hash_del(vlan, !dev->dismantle);
712 return 0;
713 }
714
715 static int macvlan_sync_address(struct net_device *dev,
716 const unsigned char *addr)
717 {
718 struct macvlan_dev *vlan = netdev_priv(dev);
719 struct net_device *lowerdev = vlan->lowerdev;
720 struct macvlan_port *port = vlan->port;
721 int err;
722
723 if (!(dev->flags & IFF_UP)) {
724 /* Just copy in the new address */
725 eth_hw_addr_set(dev, addr);
726 } else {
727 /* Rehash and update the device filters */
728 if (macvlan_addr_busy(vlan->port, addr))
729 return -EADDRINUSE;
730
731 if (!macvlan_passthru(port)) {
732 err = dev_uc_add(lowerdev, addr);
733 if (err)
734 return err;
735
736 dev_uc_del(lowerdev, dev->dev_addr);
737 }
738
739 macvlan_hash_change_addr(vlan, addr);
740 }
741 if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
742 /* Since addr_change isn't set, we are here due to lower
743 * device change. Save the lower-dev address so we can
744 * restore it later.
745 */
746 ether_addr_copy(vlan->port->perm_addr,
747 lowerdev->dev_addr);
748 }
749 macvlan_clear_addr_change(port);
750 return 0;
751 }
752
753 static int macvlan_set_mac_address(struct net_device *dev, void *p)
754 {
755 struct macvlan_dev *vlan = netdev_priv(dev);
756 struct sockaddr *addr = p;
757
758 if (!is_valid_ether_addr(addr->sa_data))
759 return -EADDRNOTAVAIL;
760
761 /* If the addresses are the same, this is a no-op */
762 if (ether_addr_equal(dev->dev_addr, addr->sa_data))
763 return 0;
764
765 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
766 macvlan_set_addr_change(vlan->port);
767 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
768 }
769
770 if (macvlan_addr_busy(vlan->port, addr->sa_data))
771 return -EADDRINUSE;
772
773 return macvlan_sync_address(dev, addr->sa_data);
774 }
775
776 static void macvlan_change_rx_flags(struct net_device *dev, int change)
777 {
778 struct macvlan_dev *vlan = netdev_priv(dev);
779 struct net_device *lowerdev = vlan->lowerdev;
780
781 if (dev->flags & IFF_UP) {
782 if (change & IFF_ALLMULTI)
783 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
784 if (!macvlan_passthru(vlan->port) && change & IFF_PROMISC)
785 dev_set_promiscuity(lowerdev,
786 dev->flags & IFF_PROMISC ? 1 : -1);
787
788 }
789 }
790
791 static void macvlan_compute_filter(unsigned long *mc_filter,
792 struct net_device *dev,
793 struct macvlan_dev *vlan, int cutoff)
794 {
795 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
796 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
797 } else {
798 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
799 struct netdev_hw_addr *ha;
800
801 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
802 netdev_for_each_mc_addr(ha, dev) {
803 if (!vlan && ha->synced <= cutoff)
804 continue;
805
806 __set_bit(mc_hash(vlan, ha->addr), filter);
807 }
808
809 __set_bit(mc_hash(vlan, dev->broadcast), filter);
810
811 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
812 }
813 }
814
815 static void macvlan_recompute_bc_filter(struct macvlan_dev *vlan)
816 {
817 if (vlan->port->bc_cutoff < 0) {
818 bitmap_zero(vlan->port->bc_filter, MACVLAN_MC_FILTER_SZ);
819 return;
820 }
821
822 macvlan_compute_filter(vlan->port->bc_filter, vlan->lowerdev, NULL,
823 vlan->port->bc_cutoff);
824 }
825
826 static void macvlan_set_mac_lists(struct net_device *dev)
827 {
828 struct macvlan_dev *vlan = netdev_priv(dev);
829
830 macvlan_compute_filter(vlan->mc_filter, dev, vlan, 0);
831
832 dev_uc_sync(vlan->lowerdev, dev);
833 dev_mc_sync(vlan->lowerdev, dev);
834
835 /* This is slightly inaccurate as we're including the subscription
836 * list of vlan->lowerdev too.
837 *
838 * Bug alert: This only works if everyone has the same broadcast
839 * address as lowerdev. As soon as someone changes theirs this
840 * will break.
841 *
842 * However, this is already broken as when you change your broadcast
843 * address we don't get called.
844 *
845 * The solution is to maintain a list of broadcast addresses like
846 * we do for uc/mc, if you care.
847 */
848 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL,
849 0);
850 macvlan_recompute_bc_filter(vlan);
851 }
852
853 static void update_port_bc_cutoff(struct macvlan_dev *vlan, int cutoff)
854 {
855 if (vlan->port->bc_cutoff == cutoff)
856 return;
857
858 vlan->port->bc_cutoff = cutoff;
859 macvlan_recompute_bc_filter(vlan);
860 }
861
862 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
863 {
864 struct macvlan_dev *vlan = netdev_priv(dev);
865
866 if (vlan->lowerdev->mtu < new_mtu)
867 return -EINVAL;
868 WRITE_ONCE(dev->mtu, new_mtu);
869 return 0;
870 }
871
872 static int macvlan_hwtstamp_get(struct net_device *dev,
873 struct kernel_hwtstamp_config *cfg)
874 {
875 struct net_device *real_dev = macvlan_dev_real_dev(dev);
876
877 return generic_hwtstamp_get_lower(real_dev, cfg);
878 }
879
880 static int macvlan_hwtstamp_set(struct net_device *dev,
881 struct kernel_hwtstamp_config *cfg,
882 struct netlink_ext_ack *extack)
883 {
884 struct net_device *real_dev = macvlan_dev_real_dev(dev);
885
886 if (!net_eq(dev_net(dev), &init_net))
887 return -EOPNOTSUPP;
888
889 return generic_hwtstamp_set_lower(real_dev, cfg, extack);
890 }
891
892 /*
893 * macvlan network devices have devices nesting below it and are a special
894 * "super class" of normal network devices; split their locks off into a
895 * separate class since they always nest.
896 */
897 static struct lock_class_key macvlan_netdev_addr_lock_key;
898
899 #define ALWAYS_ON_OFFLOADS \
900 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
901 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
902
903 #define ALWAYS_ON_FEATURES ALWAYS_ON_OFFLOADS
904
905 #define MACVLAN_FEATURES \
906 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
907 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
908 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
909 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
910
911 #define MACVLAN_STATE_MASK \
912 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
913
914 static void macvlan_set_lockdep_class(struct net_device *dev)
915 {
916 netdev_lockdep_set_classes(dev);
917 lockdep_set_class(&dev->addr_list_lock,
918 &macvlan_netdev_addr_lock_key);
919 }
920
921 static int macvlan_init(struct net_device *dev)
922 {
923 struct macvlan_dev *vlan = netdev_priv(dev);
924 struct net_device *lowerdev = vlan->lowerdev;
925 struct macvlan_port *port = vlan->port;
926
927 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
928 (lowerdev->state & MACVLAN_STATE_MASK);
929 dev->features = lowerdev->features & MACVLAN_FEATURES;
930 dev->features |= ALWAYS_ON_FEATURES;
931 dev->hw_features |= NETIF_F_LRO;
932 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
933 dev->vlan_features |= ALWAYS_ON_OFFLOADS;
934 dev->hw_enc_features |= dev->features;
935 dev->lltx = true;
936 netif_inherit_tso_max(dev, lowerdev);
937 dev->hard_header_len = lowerdev->hard_header_len;
938 macvlan_set_lockdep_class(dev);
939
940 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
941 if (!vlan->pcpu_stats)
942 return -ENOMEM;
943
944 port->count += 1;
945
946 /* Get macvlan's reference to lowerdev */
947 netdev_hold(lowerdev, &vlan->dev_tracker, GFP_KERNEL);
948
949 return 0;
950 }
951
952 static void macvlan_uninit(struct net_device *dev)
953 {
954 struct macvlan_dev *vlan = netdev_priv(dev);
955 struct macvlan_port *port = vlan->port;
956
957 free_percpu(vlan->pcpu_stats);
958
959 macvlan_flush_sources(port, vlan);
960 port->count -= 1;
961 if (!port->count)
962 macvlan_port_destroy(port->dev);
963 }
964
965 static void macvlan_dev_get_stats64(struct net_device *dev,
966 struct rtnl_link_stats64 *stats)
967 {
968 struct macvlan_dev *vlan = netdev_priv(dev);
969
970 if (vlan->pcpu_stats) {
971 struct vlan_pcpu_stats *p;
972 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
973 u32 rx_errors = 0, tx_dropped = 0;
974 unsigned int start;
975 int i;
976
977 for_each_possible_cpu(i) {
978 p = per_cpu_ptr(vlan->pcpu_stats, i);
979 do {
980 start = u64_stats_fetch_begin(&p->syncp);
981 rx_packets = u64_stats_read(&p->rx_packets);
982 rx_bytes = u64_stats_read(&p->rx_bytes);
983 rx_multicast = u64_stats_read(&p->rx_multicast);
984 tx_packets = u64_stats_read(&p->tx_packets);
985 tx_bytes = u64_stats_read(&p->tx_bytes);
986 } while (u64_stats_fetch_retry(&p->syncp, start));
987
988 stats->rx_packets += rx_packets;
989 stats->rx_bytes += rx_bytes;
990 stats->multicast += rx_multicast;
991 stats->tx_packets += tx_packets;
992 stats->tx_bytes += tx_bytes;
993 /* rx_errors & tx_dropped are u32, updated
994 * without syncp protection.
995 */
996 rx_errors += READ_ONCE(p->rx_errors);
997 tx_dropped += READ_ONCE(p->tx_dropped);
998 }
999 stats->rx_errors = rx_errors;
1000 stats->rx_dropped = rx_errors;
1001 stats->tx_dropped = tx_dropped;
1002 }
1003 }
1004
1005 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
1006 __be16 proto, u16 vid)
1007 {
1008 struct macvlan_dev *vlan = netdev_priv(dev);
1009 struct net_device *lowerdev = vlan->lowerdev;
1010
1011 return vlan_vid_add(lowerdev, proto, vid);
1012 }
1013
1014 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
1015 __be16 proto, u16 vid)
1016 {
1017 struct macvlan_dev *vlan = netdev_priv(dev);
1018 struct net_device *lowerdev = vlan->lowerdev;
1019
1020 vlan_vid_del(lowerdev, proto, vid);
1021 return 0;
1022 }
1023
1024 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
1025 struct net_device *dev,
1026 const unsigned char *addr, u16 vid,
1027 u16 flags, bool *notified,
1028 struct netlink_ext_ack *extack)
1029 {
1030 struct macvlan_dev *vlan = netdev_priv(dev);
1031 int err = -EINVAL;
1032
1033 /* Support unicast filter only on passthru devices.
1034 * Multicast filter should be allowed on all devices.
1035 */
1036 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1037 return -EOPNOTSUPP;
1038
1039 if (flags & NLM_F_REPLACE)
1040 return -EOPNOTSUPP;
1041
1042 if (is_unicast_ether_addr(addr))
1043 err = dev_uc_add_excl(dev, addr);
1044 else if (is_multicast_ether_addr(addr))
1045 err = dev_mc_add_excl(dev, addr);
1046
1047 return err;
1048 }
1049
1050 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1051 struct net_device *dev,
1052 const unsigned char *addr, u16 vid, bool *notified,
1053 struct netlink_ext_ack *extack)
1054 {
1055 struct macvlan_dev *vlan = netdev_priv(dev);
1056 int err = -EINVAL;
1057
1058 /* Support unicast filter only on passthru devices.
1059 * Multicast filter should be allowed on all devices.
1060 */
1061 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1062 return -EOPNOTSUPP;
1063
1064 if (is_unicast_ether_addr(addr))
1065 err = dev_uc_del(dev, addr);
1066 else if (is_multicast_ether_addr(addr))
1067 err = dev_mc_del(dev, addr);
1068
1069 return err;
1070 }
1071
1072 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1073 struct ethtool_drvinfo *drvinfo)
1074 {
1075 strscpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1076 strscpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1077 }
1078
1079 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1080 struct ethtool_link_ksettings *cmd)
1081 {
1082 const struct macvlan_dev *vlan = netdev_priv(dev);
1083
1084 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1085 }
1086
1087 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1088 struct kernel_ethtool_ts_info *info)
1089 {
1090 struct net_device *real_dev = macvlan_dev_real_dev(dev);
1091
1092 return ethtool_get_ts_info_by_layer(real_dev, info);
1093 }
1094
1095 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1096 netdev_features_t features)
1097 {
1098 struct macvlan_dev *vlan = netdev_priv(dev);
1099 netdev_features_t lowerdev_features = vlan->lowerdev->features;
1100 netdev_features_t mask;
1101
1102 features |= NETIF_F_ALL_FOR_ALL;
1103 features &= (vlan->set_features | ~MACVLAN_FEATURES);
1104 mask = features;
1105
1106 lowerdev_features &= (features | ~NETIF_F_LRO);
1107 features = netdev_increment_features(lowerdev_features, features, mask);
1108 features |= ALWAYS_ON_FEATURES;
1109 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1110
1111 return features;
1112 }
1113
1114 #ifdef CONFIG_NET_POLL_CONTROLLER
1115 static void macvlan_dev_poll_controller(struct net_device *dev)
1116 {
1117 return;
1118 }
1119
1120 static int macvlan_dev_netpoll_setup(struct net_device *dev)
1121 {
1122 struct macvlan_dev *vlan = netdev_priv(dev);
1123 struct net_device *real_dev = vlan->lowerdev;
1124 struct netpoll *netpoll;
1125 int err;
1126
1127 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1128 err = -ENOMEM;
1129 if (!netpoll)
1130 goto out;
1131
1132 err = __netpoll_setup(netpoll, real_dev);
1133 if (err) {
1134 kfree(netpoll);
1135 goto out;
1136 }
1137
1138 vlan->netpoll = netpoll;
1139
1140 out:
1141 return err;
1142 }
1143
1144 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1145 {
1146 struct macvlan_dev *vlan = netdev_priv(dev);
1147 struct netpoll *netpoll = vlan->netpoll;
1148
1149 if (!netpoll)
1150 return;
1151
1152 vlan->netpoll = NULL;
1153
1154 __netpoll_free(netpoll);
1155 }
1156 #endif /* CONFIG_NET_POLL_CONTROLLER */
1157
1158 static int macvlan_dev_get_iflink(const struct net_device *dev)
1159 {
1160 struct macvlan_dev *vlan = netdev_priv(dev);
1161
1162 return READ_ONCE(vlan->lowerdev->ifindex);
1163 }
1164
1165 static const struct ethtool_ops macvlan_ethtool_ops = {
1166 .get_link = ethtool_op_get_link,
1167 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1168 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1169 .get_ts_info = macvlan_ethtool_get_ts_info,
1170 };
1171
1172 static const struct net_device_ops macvlan_netdev_ops = {
1173 .ndo_init = macvlan_init,
1174 .ndo_uninit = macvlan_uninit,
1175 .ndo_open = macvlan_open,
1176 .ndo_stop = macvlan_stop,
1177 .ndo_start_xmit = macvlan_start_xmit,
1178 .ndo_change_mtu = macvlan_change_mtu,
1179 .ndo_fix_features = macvlan_fix_features,
1180 .ndo_change_rx_flags = macvlan_change_rx_flags,
1181 .ndo_set_mac_address = macvlan_set_mac_address,
1182 .ndo_set_rx_mode = macvlan_set_mac_lists,
1183 .ndo_get_stats64 = macvlan_dev_get_stats64,
1184 .ndo_validate_addr = eth_validate_addr,
1185 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1186 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1187 .ndo_fdb_add = macvlan_fdb_add,
1188 .ndo_fdb_del = macvlan_fdb_del,
1189 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1190 #ifdef CONFIG_NET_POLL_CONTROLLER
1191 .ndo_poll_controller = macvlan_dev_poll_controller,
1192 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1193 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1194 #endif
1195 .ndo_get_iflink = macvlan_dev_get_iflink,
1196 .ndo_features_check = passthru_features_check,
1197 .ndo_hwtstamp_get = macvlan_hwtstamp_get,
1198 .ndo_hwtstamp_set = macvlan_hwtstamp_set,
1199 };
1200
1201 static void macvlan_dev_free(struct net_device *dev)
1202 {
1203 struct macvlan_dev *vlan = netdev_priv(dev);
1204
1205 /* Get rid of the macvlan's reference to lowerdev */
1206 netdev_put(vlan->lowerdev, &vlan->dev_tracker);
1207 }
1208
1209 void macvlan_common_setup(struct net_device *dev)
1210 {
1211 ether_setup(dev);
1212
1213 /* ether_setup() has set dev->min_mtu to ETH_MIN_MTU. */
1214 dev->max_mtu = ETH_MAX_MTU;
1215 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1216 netif_keep_dst(dev);
1217 dev->priv_flags |= IFF_UNICAST_FLT;
1218 dev->change_proto_down = true;
1219 dev->netdev_ops = &macvlan_netdev_ops;
1220 dev->needs_free_netdev = true;
1221 dev->priv_destructor = macvlan_dev_free;
1222 dev->header_ops = &macvlan_hard_header_ops;
1223 dev->ethtool_ops = &macvlan_ethtool_ops;
1224 }
1225 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1226
1227 static void macvlan_setup(struct net_device *dev)
1228 {
1229 macvlan_common_setup(dev);
1230 dev->priv_flags |= IFF_NO_QUEUE;
1231 }
1232
1233 static int macvlan_port_create(struct net_device *dev)
1234 {
1235 struct macvlan_port *port;
1236 unsigned int i;
1237 int err;
1238
1239 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1240 return -EINVAL;
1241
1242 if (netdev_is_rx_handler_busy(dev))
1243 return -EBUSY;
1244
1245 port = kzalloc(sizeof(*port), GFP_KERNEL);
1246 if (port == NULL)
1247 return -ENOMEM;
1248
1249 port->dev = dev;
1250 ether_addr_copy(port->perm_addr, dev->dev_addr);
1251 INIT_LIST_HEAD(&port->vlans);
1252 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1253 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1254 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1255 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1256
1257 port->bc_queue_len_used = 0;
1258 port->bc_cutoff = 1;
1259 skb_queue_head_init(&port->bc_queue);
1260 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1261
1262 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1263 if (err)
1264 kfree(port);
1265 else
1266 dev->priv_flags |= IFF_MACVLAN_PORT;
1267 return err;
1268 }
1269
1270 static void macvlan_port_destroy(struct net_device *dev)
1271 {
1272 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1273 struct sk_buff *skb;
1274
1275 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1276 netdev_rx_handler_unregister(dev);
1277
1278 /* After this point, no packet can schedule bc_work anymore,
1279 * but we need to cancel it and purge left skbs if any.
1280 */
1281 cancel_work_sync(&port->bc_work);
1282
1283 while ((skb = __skb_dequeue(&port->bc_queue))) {
1284 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1285
1286 if (src)
1287 dev_put(src->dev);
1288
1289 kfree_skb(skb);
1290 }
1291
1292 /* If the lower device address has been changed by passthru
1293 * macvlan, put it back.
1294 */
1295 if (macvlan_passthru(port) &&
1296 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1297 struct sockaddr sa;
1298
1299 sa.sa_family = port->dev->type;
1300 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1301 dev_set_mac_address(port->dev, &sa, NULL);
1302 }
1303
1304 kfree(port);
1305 }
1306
1307 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1308 struct netlink_ext_ack *extack)
1309 {
1310 struct nlattr *nla, *head;
1311 int rem, len;
1312
1313 if (tb[IFLA_ADDRESS]) {
1314 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1315 return -EINVAL;
1316 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1317 return -EADDRNOTAVAIL;
1318 }
1319
1320 if (!data)
1321 return 0;
1322
1323 if (data[IFLA_MACVLAN_FLAGS] &&
1324 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~(MACVLAN_FLAG_NOPROMISC |
1325 MACVLAN_FLAG_NODST))
1326 return -EINVAL;
1327
1328 if (data[IFLA_MACVLAN_MODE]) {
1329 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1330 case MACVLAN_MODE_PRIVATE:
1331 case MACVLAN_MODE_VEPA:
1332 case MACVLAN_MODE_BRIDGE:
1333 case MACVLAN_MODE_PASSTHRU:
1334 case MACVLAN_MODE_SOURCE:
1335 break;
1336 default:
1337 return -EINVAL;
1338 }
1339 }
1340
1341 if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1342 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1343 case MACVLAN_MACADDR_ADD:
1344 case MACVLAN_MACADDR_DEL:
1345 case MACVLAN_MACADDR_FLUSH:
1346 case MACVLAN_MACADDR_SET:
1347 break;
1348 default:
1349 return -EINVAL;
1350 }
1351 }
1352
1353 if (data[IFLA_MACVLAN_MACADDR]) {
1354 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1355 return -EINVAL;
1356
1357 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1358 return -EADDRNOTAVAIL;
1359 }
1360
1361 if (data[IFLA_MACVLAN_MACADDR_DATA]) {
1362 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1363 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1364
1365 nla_for_each_attr(nla, head, len, rem) {
1366 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1367 nla_len(nla) != ETH_ALEN)
1368 return -EINVAL;
1369
1370 if (!is_valid_ether_addr(nla_data(nla)))
1371 return -EADDRNOTAVAIL;
1372 }
1373 }
1374
1375 if (data[IFLA_MACVLAN_MACADDR_COUNT])
1376 return -EINVAL;
1377
1378 return 0;
1379 }
1380
1381 /*
1382 * reconfigure list of remote source mac address
1383 * (only for macvlan devices in source mode)
1384 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1385 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1386 */
1387 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1388 struct nlattr *data[])
1389 {
1390 char *addr = NULL;
1391 int ret, rem, len;
1392 struct nlattr *nla, *head;
1393 struct macvlan_source_entry *entry;
1394
1395 if (data[IFLA_MACVLAN_MACADDR])
1396 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1397
1398 if (mode == MACVLAN_MACADDR_ADD) {
1399 if (!addr)
1400 return -EINVAL;
1401
1402 return macvlan_hash_add_source(vlan, addr);
1403
1404 } else if (mode == MACVLAN_MACADDR_DEL) {
1405 if (!addr)
1406 return -EINVAL;
1407
1408 entry = macvlan_hash_lookup_source(vlan, addr);
1409 if (entry) {
1410 macvlan_hash_del_source(entry);
1411 vlan->macaddr_count--;
1412 }
1413 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1414 macvlan_flush_sources(vlan->port, vlan);
1415 } else if (mode == MACVLAN_MACADDR_SET) {
1416 macvlan_flush_sources(vlan->port, vlan);
1417
1418 if (addr) {
1419 ret = macvlan_hash_add_source(vlan, addr);
1420 if (ret)
1421 return ret;
1422 }
1423
1424 if (!data[IFLA_MACVLAN_MACADDR_DATA])
1425 return 0;
1426
1427 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1428 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1429
1430 nla_for_each_attr(nla, head, len, rem) {
1431 addr = nla_data(nla);
1432 ret = macvlan_hash_add_source(vlan, addr);
1433 if (ret)
1434 return ret;
1435 }
1436 } else {
1437 return -EINVAL;
1438 }
1439
1440 return 0;
1441 }
1442
1443 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1444 struct nlattr *tb[], struct nlattr *data[],
1445 struct netlink_ext_ack *extack)
1446 {
1447 struct macvlan_dev *vlan = netdev_priv(dev);
1448 struct macvlan_port *port;
1449 struct net_device *lowerdev;
1450 int err;
1451 int macmode;
1452 bool create = false;
1453
1454 if (!tb[IFLA_LINK])
1455 return -EINVAL;
1456
1457 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1458 if (lowerdev == NULL)
1459 return -ENODEV;
1460
1461 /* When creating macvlans or macvtaps on top of other macvlans - use
1462 * the real device as the lowerdev.
1463 */
1464 if (netif_is_macvlan(lowerdev))
1465 lowerdev = macvlan_dev_real_dev(lowerdev);
1466
1467 if (!tb[IFLA_MTU])
1468 dev->mtu = lowerdev->mtu;
1469 else if (dev->mtu > lowerdev->mtu)
1470 return -EINVAL;
1471
1472 /* MTU range: 68 - lowerdev->max_mtu */
1473 dev->min_mtu = ETH_MIN_MTU;
1474 dev->max_mtu = lowerdev->max_mtu;
1475
1476 if (!tb[IFLA_ADDRESS])
1477 eth_hw_addr_random(dev);
1478
1479 if (!netif_is_macvlan_port(lowerdev)) {
1480 err = macvlan_port_create(lowerdev);
1481 if (err < 0)
1482 return err;
1483 create = true;
1484 }
1485 port = macvlan_port_get_rtnl(lowerdev);
1486
1487 /* Only 1 macvlan device can be created in passthru mode */
1488 if (macvlan_passthru(port)) {
1489 /* The macvlan port must be not created this time,
1490 * still goto destroy_macvlan_port for readability.
1491 */
1492 err = -EINVAL;
1493 goto destroy_macvlan_port;
1494 }
1495
1496 vlan->lowerdev = lowerdev;
1497 vlan->dev = dev;
1498 vlan->port = port;
1499 vlan->set_features = MACVLAN_FEATURES;
1500
1501 vlan->mode = MACVLAN_MODE_VEPA;
1502 if (data && data[IFLA_MACVLAN_MODE])
1503 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1504
1505 if (data && data[IFLA_MACVLAN_FLAGS])
1506 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1507
1508 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1509 if (port->count) {
1510 err = -EINVAL;
1511 goto destroy_macvlan_port;
1512 }
1513 macvlan_set_passthru(port);
1514 eth_hw_addr_inherit(dev, lowerdev);
1515 }
1516
1517 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1518 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1519 err = -EINVAL;
1520 goto destroy_macvlan_port;
1521 }
1522 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1523 err = macvlan_changelink_sources(vlan, macmode, data);
1524 if (err)
1525 goto destroy_macvlan_port;
1526 }
1527
1528 vlan->bc_queue_len_req = MACVLAN_DEFAULT_BC_QUEUE_LEN;
1529 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN])
1530 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1531
1532 if (data && data[IFLA_MACVLAN_BC_CUTOFF])
1533 update_port_bc_cutoff(
1534 vlan, nla_get_s32(data[IFLA_MACVLAN_BC_CUTOFF]));
1535
1536 err = register_netdevice(dev);
1537 if (err < 0)
1538 goto destroy_macvlan_port;
1539
1540 dev->priv_flags |= IFF_MACVLAN;
1541 err = netdev_upper_dev_link(lowerdev, dev, extack);
1542 if (err)
1543 goto unregister_netdev;
1544
1545 list_add_tail_rcu(&vlan->list, &port->vlans);
1546 update_port_bc_queue_len(vlan->port);
1547 netif_stacked_transfer_operstate(lowerdev, dev);
1548 linkwatch_fire_event(dev);
1549
1550 return 0;
1551
1552 unregister_netdev:
1553 /* macvlan_uninit would free the macvlan port */
1554 unregister_netdevice(dev);
1555 return err;
1556 destroy_macvlan_port:
1557 /* the macvlan port may be freed by macvlan_uninit when fail to register.
1558 * so we destroy the macvlan port only when it's valid.
1559 */
1560 if (create && macvlan_port_get_rtnl(lowerdev)) {
1561 macvlan_flush_sources(port, vlan);
1562 macvlan_port_destroy(port->dev);
1563 }
1564 return err;
1565 }
1566 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1567
1568 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1569 struct nlattr *tb[], struct nlattr *data[],
1570 struct netlink_ext_ack *extack)
1571 {
1572 return macvlan_common_newlink(src_net, dev, tb, data, extack);
1573 }
1574
1575 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1576 {
1577 struct macvlan_dev *vlan = netdev_priv(dev);
1578
1579 if (vlan->mode == MACVLAN_MODE_SOURCE)
1580 macvlan_flush_sources(vlan->port, vlan);
1581 list_del_rcu(&vlan->list);
1582 update_port_bc_queue_len(vlan->port);
1583 unregister_netdevice_queue(dev, head);
1584 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1585 }
1586 EXPORT_SYMBOL_GPL(macvlan_dellink);
1587
1588 static int macvlan_changelink(struct net_device *dev,
1589 struct nlattr *tb[], struct nlattr *data[],
1590 struct netlink_ext_ack *extack)
1591 {
1592 struct macvlan_dev *vlan = netdev_priv(dev);
1593 enum macvlan_mode mode;
1594 bool set_mode = false;
1595 enum macvlan_macaddr_mode macmode;
1596 int ret;
1597
1598 /* Validate mode, but don't set yet: setting flags may fail. */
1599 if (data && data[IFLA_MACVLAN_MODE]) {
1600 set_mode = true;
1601 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1602 /* Passthrough mode can't be set or cleared dynamically */
1603 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1604 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1605 return -EINVAL;
1606 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1607 vlan->mode != mode)
1608 macvlan_flush_sources(vlan->port, vlan);
1609 }
1610
1611 if (data && data[IFLA_MACVLAN_FLAGS]) {
1612 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1613 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1614 if (macvlan_passthru(vlan->port) && promisc) {
1615 int err;
1616
1617 if (flags & MACVLAN_FLAG_NOPROMISC)
1618 err = dev_set_promiscuity(vlan->lowerdev, -1);
1619 else
1620 err = dev_set_promiscuity(vlan->lowerdev, 1);
1621 if (err < 0)
1622 return err;
1623 }
1624 vlan->flags = flags;
1625 }
1626
1627 if (data && data[IFLA_MACVLAN_BC_QUEUE_LEN]) {
1628 vlan->bc_queue_len_req = nla_get_u32(data[IFLA_MACVLAN_BC_QUEUE_LEN]);
1629 update_port_bc_queue_len(vlan->port);
1630 }
1631
1632 if (data && data[IFLA_MACVLAN_BC_CUTOFF])
1633 update_port_bc_cutoff(
1634 vlan, nla_get_s32(data[IFLA_MACVLAN_BC_CUTOFF]));
1635
1636 if (set_mode)
1637 vlan->mode = mode;
1638 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1639 if (vlan->mode != MACVLAN_MODE_SOURCE)
1640 return -EINVAL;
1641 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1642 ret = macvlan_changelink_sources(vlan, macmode, data);
1643 if (ret)
1644 return ret;
1645 }
1646 return 0;
1647 }
1648
1649 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1650 {
1651 if (vlan->macaddr_count == 0)
1652 return 0;
1653 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1654 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1655 }
1656
1657 static size_t macvlan_get_size(const struct net_device *dev)
1658 {
1659 struct macvlan_dev *vlan = netdev_priv(dev);
1660
1661 return (0
1662 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1663 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1664 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1665 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1666 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN */
1667 + nla_total_size(4) /* IFLA_MACVLAN_BC_QUEUE_LEN_USED */
1668 );
1669 }
1670
1671 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1672 const struct macvlan_dev *vlan,
1673 const int i)
1674 {
1675 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1676 struct macvlan_source_entry *entry;
1677
1678 hlist_for_each_entry_rcu(entry, h, hlist, lockdep_rtnl_is_held()) {
1679 if (entry->vlan != vlan)
1680 continue;
1681 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1682 return 1;
1683 }
1684 return 0;
1685 }
1686
1687 static int macvlan_fill_info(struct sk_buff *skb,
1688 const struct net_device *dev)
1689 {
1690 struct macvlan_dev *vlan = netdev_priv(dev);
1691 struct macvlan_port *port = vlan->port;
1692 int i;
1693 struct nlattr *nest;
1694
1695 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1696 goto nla_put_failure;
1697 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1698 goto nla_put_failure;
1699 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1700 goto nla_put_failure;
1701 if (vlan->macaddr_count > 0) {
1702 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1703 if (nest == NULL)
1704 goto nla_put_failure;
1705
1706 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1707 if (macvlan_fill_info_macaddr(skb, vlan, i))
1708 goto nla_put_failure;
1709 }
1710 nla_nest_end(skb, nest);
1711 }
1712 if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN, vlan->bc_queue_len_req))
1713 goto nla_put_failure;
1714 if (nla_put_u32(skb, IFLA_MACVLAN_BC_QUEUE_LEN_USED, port->bc_queue_len_used))
1715 goto nla_put_failure;
1716 if (port->bc_cutoff != 1 &&
1717 nla_put_s32(skb, IFLA_MACVLAN_BC_CUTOFF, port->bc_cutoff))
1718 goto nla_put_failure;
1719 return 0;
1720
1721 nla_put_failure:
1722 return -EMSGSIZE;
1723 }
1724
1725 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1726 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1727 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1728 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1729 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1730 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1731 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1732 [IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 },
1733 [IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT },
1734 [IFLA_MACVLAN_BC_CUTOFF] = { .type = NLA_S32 },
1735 };
1736
1737 int macvlan_link_register(struct rtnl_link_ops *ops)
1738 {
1739 /* common fields */
1740 ops->validate = macvlan_validate;
1741 ops->maxtype = IFLA_MACVLAN_MAX;
1742 ops->policy = macvlan_policy;
1743 ops->changelink = macvlan_changelink;
1744 ops->get_size = macvlan_get_size;
1745 ops->fill_info = macvlan_fill_info;
1746
1747 return rtnl_link_register(ops);
1748 };
1749 EXPORT_SYMBOL_GPL(macvlan_link_register);
1750
1751 static struct net *macvlan_get_link_net(const struct net_device *dev)
1752 {
1753 return dev_net(macvlan_dev_real_dev(dev));
1754 }
1755
1756 static struct rtnl_link_ops macvlan_link_ops = {
1757 .kind = "macvlan",
1758 .setup = macvlan_setup,
1759 .newlink = macvlan_newlink,
1760 .dellink = macvlan_dellink,
1761 .get_link_net = macvlan_get_link_net,
1762 .priv_size = sizeof(struct macvlan_dev),
1763 };
1764
1765 static void update_port_bc_queue_len(struct macvlan_port *port)
1766 {
1767 u32 max_bc_queue_len_req = 0;
1768 struct macvlan_dev *vlan;
1769
1770 list_for_each_entry(vlan, &port->vlans, list) {
1771 if (vlan->bc_queue_len_req > max_bc_queue_len_req)
1772 max_bc_queue_len_req = vlan->bc_queue_len_req;
1773 }
1774 port->bc_queue_len_used = max_bc_queue_len_req;
1775 }
1776
1777 static int macvlan_device_event(struct notifier_block *unused,
1778 unsigned long event, void *ptr)
1779 {
1780 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1781 struct macvlan_dev *vlan, *next;
1782 struct macvlan_port *port;
1783 LIST_HEAD(list_kill);
1784
1785 if (!netif_is_macvlan_port(dev))
1786 return NOTIFY_DONE;
1787
1788 port = macvlan_port_get_rtnl(dev);
1789
1790 switch (event) {
1791 case NETDEV_UP:
1792 case NETDEV_DOWN:
1793 case NETDEV_CHANGE:
1794 list_for_each_entry(vlan, &port->vlans, list)
1795 netif_stacked_transfer_operstate(vlan->lowerdev,
1796 vlan->dev);
1797 break;
1798 case NETDEV_FEAT_CHANGE:
1799 list_for_each_entry(vlan, &port->vlans, list) {
1800 netif_inherit_tso_max(vlan->dev, dev);
1801 netdev_update_features(vlan->dev);
1802 }
1803 break;
1804 case NETDEV_CHANGEMTU:
1805 list_for_each_entry(vlan, &port->vlans, list) {
1806 if (vlan->dev->mtu <= dev->mtu)
1807 continue;
1808 dev_set_mtu(vlan->dev, dev->mtu);
1809 }
1810 break;
1811 case NETDEV_CHANGEADDR:
1812 if (!macvlan_passthru(port))
1813 return NOTIFY_DONE;
1814
1815 vlan = list_first_entry_or_null(&port->vlans,
1816 struct macvlan_dev,
1817 list);
1818
1819 if (vlan && macvlan_sync_address(vlan->dev, dev->dev_addr))
1820 return NOTIFY_BAD;
1821
1822 break;
1823 case NETDEV_UNREGISTER:
1824 /* twiddle thumbs on netns device moves */
1825 if (dev->reg_state != NETREG_UNREGISTERING)
1826 break;
1827
1828 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1829 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1830 unregister_netdevice_many(&list_kill);
1831 break;
1832 case NETDEV_PRE_TYPE_CHANGE:
1833 /* Forbid underlying device to change its type. */
1834 return NOTIFY_BAD;
1835
1836 case NETDEV_NOTIFY_PEERS:
1837 case NETDEV_BONDING_FAILOVER:
1838 case NETDEV_RESEND_IGMP:
1839 /* Propagate to all vlans */
1840 list_for_each_entry(vlan, &port->vlans, list)
1841 call_netdevice_notifiers(event, vlan->dev);
1842 }
1843 return NOTIFY_DONE;
1844 }
1845
1846 static struct notifier_block macvlan_notifier_block __read_mostly = {
1847 .notifier_call = macvlan_device_event,
1848 };
1849
1850 static int __init macvlan_init_module(void)
1851 {
1852 int err;
1853
1854 register_netdevice_notifier(&macvlan_notifier_block);
1855
1856 err = macvlan_link_register(&macvlan_link_ops);
1857 if (err < 0)
1858 goto err1;
1859 return 0;
1860 err1:
1861 unregister_netdevice_notifier(&macvlan_notifier_block);
1862 return err;
1863 }
1864
1865 static void __exit macvlan_cleanup_module(void)
1866 {
1867 rtnl_link_unregister(&macvlan_link_ops);
1868 unregister_netdevice_notifier(&macvlan_notifier_block);
1869 }
1870
1871 module_init(macvlan_init_module);
1872 module_exit(macvlan_cleanup_module);
1873
1874 MODULE_LICENSE("GPL");
1875 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1876 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1877 MODULE_ALIAS_RTNL_LINK("macvlan");
Kernel DRM miscellaneous fixes and cross-tree changes