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