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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
43struct 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
59struct 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
66struct 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
72static void macvlan_port_destroy(struct net_device *dev);
73static void update_port_bc_queue_len(struct macvlan_port *port);
74
75static inline bool macvlan_passthru(const struct macvlan_port *port)
76{
77 return port->flags & MACVLAN_F_PASSTHRU;
78}
79
80static inline void macvlan_set_passthru(struct macvlan_port *port)
81{
82 port->flags |= MACVLAN_F_PASSTHRU;
83}
84
85static inline bool macvlan_addr_change(const struct macvlan_port *port)
86{
87 return port->flags & MACVLAN_F_ADDRCHANGE;
88}
89
90static inline void macvlan_set_addr_change(struct macvlan_port *port)
91{
92 port->flags |= MACVLAN_F_ADDRCHANGE;
93}
94
95static inline void macvlan_clear_addr_change(struct macvlan_port *port)
96{
97 port->flags &= ~MACVLAN_F_ADDRCHANGE;
98}
99
100/* Hash Ethernet address */
101static 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
114static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
115{
116 return rcu_dereference(dev->rx_handler_data);
117}
118
119static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
120{
121 return rtnl_dereference(dev->rx_handler_data);
122}
123
124static 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
138static 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
154static 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
178static 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
187static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
188{
189 hlist_del_rcu(&entry->hlist);
190 kfree_rcu(entry, rcu);
191}
192
193static 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
200static 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
211static 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
229static 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
247static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
248{
249 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
250}
251
252
253static 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
262static 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
296static 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
321static 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
349static 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
378free_nskb:
379 kfree_skb(nskb);
380err:
381 dev_core_stats_rx_dropped_inc(skb->dev);
382}
383
384static 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
398static 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
424static 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 */
445static 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;
525out:
526 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
527 return handle_res;
528}
529
530static 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 }
554xmit_world:
555 skb->dev = vlan->lowerdev;
556 return dev_queue_xmit_accel(skb,
557 netdev_get_sb_channel(dev) ? dev : NULL);
558}
559
560static 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
570static 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
596static 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
607static 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
615static 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
663hash_add:
664 macvlan_hash_add(vlan);
665 return 0;
666
667clear_multi:
668 if (dev->flags & IFF_ALLMULTI)
669 dev_set_allmulti(lowerdev, -1);
670del_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 }
678out:
679 return err;
680}
681
682static 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
710hash_del:
711 macvlan_hash_del(vlan, !dev->dismantle);
712 return 0;
713}
714
715static 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
753static 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
776static 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
791static 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
815static 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
826static 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
853static 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
862static 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
872static 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
880static 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 */
897static 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
914static 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
921static 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
952static 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
965static 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
1005static 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
1014static 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
1024static 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
1050static 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
1072static 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
1079static 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
1087static 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
1095static 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
1115static void macvlan_dev_poll_controller(struct net_device *dev)
1116{
1117 return;
1118}
1119
1120static 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
1140out:
1141 return err;
1142}
1143
1144static 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
1158static 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
1165static 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
1172static 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
1201static 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
1209void 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}
1225EXPORT_SYMBOL_GPL(macvlan_common_setup);
1226
1227static void macvlan_setup(struct net_device *dev)
1228{
1229 macvlan_common_setup(dev);
1230 dev->priv_flags |= IFF_NO_QUEUE;
1231}
1232
1233static 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
1270static 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
1307static 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 */
1387static 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
1443int 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
1552unregister_netdev:
1553 /* macvlan_uninit would free the macvlan port */
1554 unregister_netdevice(dev);
1555 return err;
1556destroy_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}
1566EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1567
1568static 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
1575void 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}
1586EXPORT_SYMBOL_GPL(macvlan_dellink);
1587
1588static 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
1649static 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
1657static 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
1671static 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
1687static 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
1721nla_put_failure:
1722 return -EMSGSIZE;
1723}
1724
1725static 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
1737int 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};
1749EXPORT_SYMBOL_GPL(macvlan_link_register);
1750
1751static struct net *macvlan_get_link_net(const struct net_device *dev)
1752{
1753 return dev_net(macvlan_dev_real_dev(dev));
1754}
1755
1756static 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
1765static 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
1777static 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
1846static struct notifier_block macvlan_notifier_block __read_mostly = {
1847 .notifier_call = macvlan_device_event,
1848};
1849
1850static 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;
1860err1:
1861 unregister_netdevice_notifier(&macvlan_notifier_block);
1862 return err;
1863}
1864
1865static void __exit macvlan_cleanup_module(void)
1866{
1867 rtnl_link_unregister(&macvlan_link_ops);
1868 unregister_netdevice_notifier(&macvlan_notifier_block);
1869}
1870
1871module_init(macvlan_init_module);
1872module_exit(macvlan_cleanup_module);
1873
1874MODULE_LICENSE("GPL");
1875MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1876MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1877MODULE_ALIAS_RTNL_LINK("macvlan");
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
42struct macvlan_port {
43 struct net_device *dev;
44 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
45 struct list_head vlans;
46 struct sk_buff_head bc_queue;
47 struct work_struct bc_work;
48 bool passthru;
49 int count;
50 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
51 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
52};
53
54struct 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
61struct 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
67static void macvlan_port_destroy(struct net_device *dev);
68
69/* Hash Ethernet address */
70static 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
83static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
84{
85 return rcu_dereference(dev->rx_handler_data);
86}
87
88static 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
95static 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
108static 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
124static 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
148static 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
157static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
158{
159 hlist_del_rcu(&entry->hlist);
160 kfree_rcu(entry, rcu);
161}
162
163static 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
170static 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
181static bool 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 true;
190
191 if (macvlan_hash_lookup(port, addr))
192 return true;
193
194 return false;
195}
196
197
198static 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
216static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
217{
218 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
219}
220
221
222static 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
231static 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
268static 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}
313
314static void macvlan_broadcast_enqueue(struct macvlan_port *port,
315 const struct macvlan_dev *src,
316 struct sk_buff *skb)
317{
318 struct sk_buff *nskb;
319 int err = -ENOMEM;
320
321 nskb = skb_clone(skb, GFP_ATOMIC);
322 if (!nskb)
323 goto err;
324
325 MACVLAN_SKB_CB(nskb)->src = src;
326
327 spin_lock(&port->bc_queue.lock);
328 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
329 if (src)
330 dev_hold(src->dev);
331 __skb_queue_tail(&port->bc_queue, nskb);
332 err = 0;
333 }
334 spin_unlock(&port->bc_queue.lock);
335
336 if (err)
337 goto free_nskb;
338
339 schedule_work(&port->bc_work);
340 return;
341
342free_nskb:
343 kfree_skb(nskb);
344err:
345 atomic_long_inc(&skb->dev->rx_dropped);
346}
347
348static void macvlan_flush_sources(struct macvlan_port *port,
349 struct macvlan_dev *vlan)
350{
351 int i;
352
353 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
354 struct hlist_node *h, *n;
355
356 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
357 struct macvlan_source_entry *entry;
358
359 entry = hlist_entry(h, struct macvlan_source_entry,
360 hlist);
361 if (entry->vlan == vlan)
362 macvlan_hash_del_source(entry);
363 }
364 }
365 vlan->macaddr_count = 0;
366}
367
368static void macvlan_forward_source_one(struct sk_buff *skb,
369 struct macvlan_dev *vlan)
370{
371 struct sk_buff *nskb;
372 struct net_device *dev;
373 int len;
374 int ret;
375
376 dev = vlan->dev;
377 if (unlikely(!(dev->flags & IFF_UP)))
378 return;
379
380 nskb = skb_clone(skb, GFP_ATOMIC);
381 if (!nskb)
382 return;
383
384 len = nskb->len + ETH_HLEN;
385 nskb->dev = dev;
386 nskb->pkt_type = PACKET_HOST;
387
388 ret = netif_rx(nskb);
389 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
390}
391
392static void macvlan_forward_source(struct sk_buff *skb,
393 struct macvlan_port *port,
394 const unsigned char *addr)
395{
396 struct macvlan_source_entry *entry;
397 u32 idx = macvlan_eth_hash(addr);
398 struct hlist_head *h = &port->vlan_source_hash[idx];
399
400 hlist_for_each_entry_rcu(entry, h, hlist) {
401 if (ether_addr_equal_64bits(entry->addr, addr))
402 macvlan_forward_source_one(skb, entry->vlan);
403 }
404}
405
406/* called under rcu_read_lock() from netif_receive_skb */
407static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
408{
409 struct macvlan_port *port;
410 struct sk_buff *skb = *pskb;
411 const struct ethhdr *eth = eth_hdr(skb);
412 const struct macvlan_dev *vlan;
413 const struct macvlan_dev *src;
414 struct net_device *dev;
415 unsigned int len = 0;
416 int ret;
417 rx_handler_result_t handle_res;
418
419 port = macvlan_port_get_rcu(skb->dev);
420 if (is_multicast_ether_addr(eth->h_dest)) {
421 unsigned int hash;
422
423 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
424 if (!skb)
425 return RX_HANDLER_CONSUMED;
426 *pskb = skb;
427 eth = eth_hdr(skb);
428 macvlan_forward_source(skb, port, eth->h_source);
429 src = macvlan_hash_lookup(port, eth->h_source);
430 if (src && src->mode != MACVLAN_MODE_VEPA &&
431 src->mode != MACVLAN_MODE_BRIDGE) {
432 /* forward to original port. */
433 vlan = src;
434 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
435 netif_rx(skb);
436 handle_res = RX_HANDLER_CONSUMED;
437 goto out;
438 }
439
440 hash = mc_hash(NULL, eth->h_dest);
441 if (test_bit(hash, port->mc_filter))
442 macvlan_broadcast_enqueue(port, src, skb);
443
444 return RX_HANDLER_PASS;
445 }
446
447 macvlan_forward_source(skb, port, eth->h_source);
448 if (port->passthru)
449 vlan = list_first_or_null_rcu(&port->vlans,
450 struct macvlan_dev, list);
451 else
452 vlan = macvlan_hash_lookup(port, eth->h_dest);
453 if (vlan == NULL)
454 return RX_HANDLER_PASS;
455
456 dev = vlan->dev;
457 if (unlikely(!(dev->flags & IFF_UP))) {
458 kfree_skb(skb);
459 return RX_HANDLER_CONSUMED;
460 }
461 len = skb->len + ETH_HLEN;
462 skb = skb_share_check(skb, GFP_ATOMIC);
463 if (!skb) {
464 ret = NET_RX_DROP;
465 handle_res = RX_HANDLER_CONSUMED;
466 goto out;
467 }
468
469 *pskb = skb;
470 skb->dev = dev;
471 skb->pkt_type = PACKET_HOST;
472
473 ret = NET_RX_SUCCESS;
474 handle_res = RX_HANDLER_ANOTHER;
475out:
476 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
477 return handle_res;
478}
479
480static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
481{
482 const struct macvlan_dev *vlan = netdev_priv(dev);
483 const struct macvlan_port *port = vlan->port;
484 const struct macvlan_dev *dest;
485
486 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
487 const struct ethhdr *eth = (void *)skb->data;
488
489 /* send to other bridge ports directly */
490 if (is_multicast_ether_addr(eth->h_dest)) {
491 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
492 goto xmit_world;
493 }
494
495 dest = macvlan_hash_lookup(port, eth->h_dest);
496 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
497 /* send to lowerdev first for its network taps */
498 dev_forward_skb(vlan->lowerdev, skb);
499
500 return NET_XMIT_SUCCESS;
501 }
502 }
503
504xmit_world:
505 skb->dev = vlan->lowerdev;
506 return dev_queue_xmit(skb);
507}
508
509static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
510{
511#ifdef CONFIG_NET_POLL_CONTROLLER
512 if (vlan->netpoll)
513 netpoll_send_skb(vlan->netpoll, skb);
514#else
515 BUG();
516#endif
517 return NETDEV_TX_OK;
518}
519
520static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
521 struct net_device *dev)
522{
523 unsigned int len = skb->len;
524 int ret;
525 struct macvlan_dev *vlan = netdev_priv(dev);
526
527 if (unlikely(netpoll_tx_running(dev)))
528 return macvlan_netpoll_send_skb(vlan, skb);
529
530 if (vlan->fwd_priv) {
531 skb->dev = vlan->lowerdev;
532 ret = dev_queue_xmit_accel(skb, vlan->fwd_priv);
533 } else {
534 ret = macvlan_queue_xmit(skb, dev);
535 }
536
537 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
538 struct vlan_pcpu_stats *pcpu_stats;
539
540 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
541 u64_stats_update_begin(&pcpu_stats->syncp);
542 pcpu_stats->tx_packets++;
543 pcpu_stats->tx_bytes += len;
544 u64_stats_update_end(&pcpu_stats->syncp);
545 } else {
546 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
547 }
548 return ret;
549}
550
551static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
552 unsigned short type, const void *daddr,
553 const void *saddr, unsigned len)
554{
555 const struct macvlan_dev *vlan = netdev_priv(dev);
556 struct net_device *lowerdev = vlan->lowerdev;
557
558 return dev_hard_header(skb, lowerdev, type, daddr,
559 saddr ? : dev->dev_addr, len);
560}
561
562static const struct header_ops macvlan_hard_header_ops = {
563 .create = macvlan_hard_header,
564 .parse = eth_header_parse,
565 .cache = eth_header_cache,
566 .cache_update = eth_header_cache_update,
567};
568
569static struct rtnl_link_ops macvlan_link_ops;
570
571static int macvlan_open(struct net_device *dev)
572{
573 struct macvlan_dev *vlan = netdev_priv(dev);
574 struct net_device *lowerdev = vlan->lowerdev;
575 int err;
576
577 if (vlan->port->passthru) {
578 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
579 err = dev_set_promiscuity(lowerdev, 1);
580 if (err < 0)
581 goto out;
582 }
583 goto hash_add;
584 }
585
586 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD &&
587 dev->rtnl_link_ops == &macvlan_link_ops) {
588 vlan->fwd_priv =
589 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
590
591 /* If we get a NULL pointer back, or if we get an error
592 * then we should just fall through to the non accelerated path
593 */
594 if (IS_ERR_OR_NULL(vlan->fwd_priv)) {
595 vlan->fwd_priv = NULL;
596 } else
597 return 0;
598 }
599
600 err = -EBUSY;
601 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
602 goto out;
603
604 err = dev_uc_add(lowerdev, dev->dev_addr);
605 if (err < 0)
606 goto out;
607 if (dev->flags & IFF_ALLMULTI) {
608 err = dev_set_allmulti(lowerdev, 1);
609 if (err < 0)
610 goto del_unicast;
611 }
612
613 if (dev->flags & IFF_PROMISC) {
614 err = dev_set_promiscuity(lowerdev, 1);
615 if (err < 0)
616 goto clear_multi;
617 }
618
619hash_add:
620 macvlan_hash_add(vlan);
621 return 0;
622
623clear_multi:
624 if (dev->flags & IFF_ALLMULTI)
625 dev_set_allmulti(lowerdev, -1);
626del_unicast:
627 dev_uc_del(lowerdev, dev->dev_addr);
628out:
629 if (vlan->fwd_priv) {
630 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
631 vlan->fwd_priv);
632 vlan->fwd_priv = NULL;
633 }
634 return err;
635}
636
637static int macvlan_stop(struct net_device *dev)
638{
639 struct macvlan_dev *vlan = netdev_priv(dev);
640 struct net_device *lowerdev = vlan->lowerdev;
641
642 if (vlan->fwd_priv) {
643 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
644 vlan->fwd_priv);
645 vlan->fwd_priv = NULL;
646 return 0;
647 }
648
649 dev_uc_unsync(lowerdev, dev);
650 dev_mc_unsync(lowerdev, dev);
651
652 if (vlan->port->passthru) {
653 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
654 dev_set_promiscuity(lowerdev, -1);
655 goto hash_del;
656 }
657
658 if (dev->flags & IFF_ALLMULTI)
659 dev_set_allmulti(lowerdev, -1);
660
661 if (dev->flags & IFF_PROMISC)
662 dev_set_promiscuity(lowerdev, -1);
663
664 dev_uc_del(lowerdev, dev->dev_addr);
665
666hash_del:
667 macvlan_hash_del(vlan, !dev->dismantle);
668 return 0;
669}
670
671static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
672{
673 struct macvlan_dev *vlan = netdev_priv(dev);
674 struct net_device *lowerdev = vlan->lowerdev;
675 int err;
676
677 if (!(dev->flags & IFF_UP)) {
678 /* Just copy in the new address */
679 ether_addr_copy(dev->dev_addr, addr);
680 } else {
681 /* Rehash and update the device filters */
682 if (macvlan_addr_busy(vlan->port, addr))
683 return -EBUSY;
684
685 if (!vlan->port->passthru) {
686 err = dev_uc_add(lowerdev, addr);
687 if (err)
688 return err;
689
690 dev_uc_del(lowerdev, dev->dev_addr);
691 }
692
693 macvlan_hash_change_addr(vlan, addr);
694 }
695 return 0;
696}
697
698static int macvlan_set_mac_address(struct net_device *dev, void *p)
699{
700 struct macvlan_dev *vlan = netdev_priv(dev);
701 struct sockaddr *addr = p;
702
703 if (!is_valid_ether_addr(addr->sa_data))
704 return -EADDRNOTAVAIL;
705
706 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
707 dev_set_mac_address(vlan->lowerdev, addr);
708 return 0;
709 }
710
711 return macvlan_sync_address(dev, addr->sa_data);
712}
713
714static void macvlan_change_rx_flags(struct net_device *dev, int change)
715{
716 struct macvlan_dev *vlan = netdev_priv(dev);
717 struct net_device *lowerdev = vlan->lowerdev;
718
719 if (dev->flags & IFF_UP) {
720 if (change & IFF_ALLMULTI)
721 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
722 if (change & IFF_PROMISC)
723 dev_set_promiscuity(lowerdev,
724 dev->flags & IFF_PROMISC ? 1 : -1);
725
726 }
727}
728
729static void macvlan_compute_filter(unsigned long *mc_filter,
730 struct net_device *dev,
731 struct macvlan_dev *vlan)
732{
733 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
734 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
735 } else {
736 struct netdev_hw_addr *ha;
737 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
738
739 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
740 netdev_for_each_mc_addr(ha, dev) {
741 __set_bit(mc_hash(vlan, ha->addr), filter);
742 }
743
744 __set_bit(mc_hash(vlan, dev->broadcast), filter);
745
746 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
747 }
748}
749
750static void macvlan_set_mac_lists(struct net_device *dev)
751{
752 struct macvlan_dev *vlan = netdev_priv(dev);
753
754 macvlan_compute_filter(vlan->mc_filter, dev, vlan);
755
756 dev_uc_sync(vlan->lowerdev, dev);
757 dev_mc_sync(vlan->lowerdev, dev);
758
759 /* This is slightly inaccurate as we're including the subscription
760 * list of vlan->lowerdev too.
761 *
762 * Bug alert: This only works if everyone has the same broadcast
763 * address as lowerdev. As soon as someone changes theirs this
764 * will break.
765 *
766 * However, this is already broken as when you change your broadcast
767 * address we don't get called.
768 *
769 * The solution is to maintain a list of broadcast addresses like
770 * we do for uc/mc, if you care.
771 */
772 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
773}
774
775static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
776{
777 struct macvlan_dev *vlan = netdev_priv(dev);
778
779 if (vlan->lowerdev->mtu < new_mtu)
780 return -EINVAL;
781 dev->mtu = new_mtu;
782 return 0;
783}
784
785/*
786 * macvlan network devices have devices nesting below it and are a special
787 * "super class" of normal network devices; split their locks off into a
788 * separate class since they always nest.
789 */
790static struct lock_class_key macvlan_netdev_addr_lock_key;
791
792#define ALWAYS_ON_FEATURES \
793 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | NETIF_F_LLTX | \
794 NETIF_F_GSO_ROBUST)
795
796#define MACVLAN_FEATURES \
797 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
798 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_LRO | \
799 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
800 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
801
802#define MACVLAN_STATE_MASK \
803 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
804
805static int macvlan_get_nest_level(struct net_device *dev)
806{
807 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
808}
809
810static void macvlan_set_lockdep_class(struct net_device *dev)
811{
812 netdev_lockdep_set_classes(dev);
813 lockdep_set_class_and_subclass(&dev->addr_list_lock,
814 &macvlan_netdev_addr_lock_key,
815 macvlan_get_nest_level(dev));
816}
817
818static int macvlan_init(struct net_device *dev)
819{
820 struct macvlan_dev *vlan = netdev_priv(dev);
821 const struct net_device *lowerdev = vlan->lowerdev;
822 struct macvlan_port *port = vlan->port;
823
824 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
825 (lowerdev->state & MACVLAN_STATE_MASK);
826 dev->features = lowerdev->features & MACVLAN_FEATURES;
827 dev->features |= ALWAYS_ON_FEATURES;
828 dev->hw_features |= NETIF_F_LRO;
829 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
830 dev->gso_max_size = lowerdev->gso_max_size;
831 dev->gso_max_segs = lowerdev->gso_max_segs;
832 dev->hard_header_len = lowerdev->hard_header_len;
833
834 macvlan_set_lockdep_class(dev);
835
836 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
837 if (!vlan->pcpu_stats)
838 return -ENOMEM;
839
840 port->count += 1;
841
842 return 0;
843}
844
845static void macvlan_uninit(struct net_device *dev)
846{
847 struct macvlan_dev *vlan = netdev_priv(dev);
848 struct macvlan_port *port = vlan->port;
849
850 free_percpu(vlan->pcpu_stats);
851
852 macvlan_flush_sources(port, vlan);
853 port->count -= 1;
854 if (!port->count)
855 macvlan_port_destroy(port->dev);
856}
857
858static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
859 struct rtnl_link_stats64 *stats)
860{
861 struct macvlan_dev *vlan = netdev_priv(dev);
862
863 if (vlan->pcpu_stats) {
864 struct vlan_pcpu_stats *p;
865 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
866 u32 rx_errors = 0, tx_dropped = 0;
867 unsigned int start;
868 int i;
869
870 for_each_possible_cpu(i) {
871 p = per_cpu_ptr(vlan->pcpu_stats, i);
872 do {
873 start = u64_stats_fetch_begin_irq(&p->syncp);
874 rx_packets = p->rx_packets;
875 rx_bytes = p->rx_bytes;
876 rx_multicast = p->rx_multicast;
877 tx_packets = p->tx_packets;
878 tx_bytes = p->tx_bytes;
879 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
880
881 stats->rx_packets += rx_packets;
882 stats->rx_bytes += rx_bytes;
883 stats->multicast += rx_multicast;
884 stats->tx_packets += tx_packets;
885 stats->tx_bytes += tx_bytes;
886 /* rx_errors & tx_dropped are u32, updated
887 * without syncp protection.
888 */
889 rx_errors += p->rx_errors;
890 tx_dropped += p->tx_dropped;
891 }
892 stats->rx_errors = rx_errors;
893 stats->rx_dropped = rx_errors;
894 stats->tx_dropped = tx_dropped;
895 }
896 return stats;
897}
898
899static int macvlan_vlan_rx_add_vid(struct net_device *dev,
900 __be16 proto, u16 vid)
901{
902 struct macvlan_dev *vlan = netdev_priv(dev);
903 struct net_device *lowerdev = vlan->lowerdev;
904
905 return vlan_vid_add(lowerdev, proto, vid);
906}
907
908static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
909 __be16 proto, u16 vid)
910{
911 struct macvlan_dev *vlan = netdev_priv(dev);
912 struct net_device *lowerdev = vlan->lowerdev;
913
914 vlan_vid_del(lowerdev, proto, vid);
915 return 0;
916}
917
918static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
919 struct net_device *dev,
920 const unsigned char *addr, u16 vid,
921 u16 flags)
922{
923 struct macvlan_dev *vlan = netdev_priv(dev);
924 int err = -EINVAL;
925
926 /* Support unicast filter only on passthru devices.
927 * Multicast filter should be allowed on all devices.
928 */
929 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
930 return -EOPNOTSUPP;
931
932 if (flags & NLM_F_REPLACE)
933 return -EOPNOTSUPP;
934
935 if (is_unicast_ether_addr(addr))
936 err = dev_uc_add_excl(dev, addr);
937 else if (is_multicast_ether_addr(addr))
938 err = dev_mc_add_excl(dev, addr);
939
940 return err;
941}
942
943static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
944 struct net_device *dev,
945 const unsigned char *addr, u16 vid)
946{
947 struct macvlan_dev *vlan = netdev_priv(dev);
948 int err = -EINVAL;
949
950 /* Support unicast filter only on passthru devices.
951 * Multicast filter should be allowed on all devices.
952 */
953 if (!vlan->port->passthru && is_unicast_ether_addr(addr))
954 return -EOPNOTSUPP;
955
956 if (is_unicast_ether_addr(addr))
957 err = dev_uc_del(dev, addr);
958 else if (is_multicast_ether_addr(addr))
959 err = dev_mc_del(dev, addr);
960
961 return err;
962}
963
964static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
965 struct ethtool_drvinfo *drvinfo)
966{
967 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
968 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
969}
970
971static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
972 struct ethtool_link_ksettings *cmd)
973{
974 const struct macvlan_dev *vlan = netdev_priv(dev);
975
976 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
977}
978
979static netdev_features_t macvlan_fix_features(struct net_device *dev,
980 netdev_features_t features)
981{
982 struct macvlan_dev *vlan = netdev_priv(dev);
983 netdev_features_t lowerdev_features = vlan->lowerdev->features;
984 netdev_features_t mask;
985
986 features |= NETIF_F_ALL_FOR_ALL;
987 features &= (vlan->set_features | ~MACVLAN_FEATURES);
988 mask = features;
989
990 lowerdev_features &= (features | ~NETIF_F_LRO);
991 features = netdev_increment_features(lowerdev_features, features, mask);
992 features |= ALWAYS_ON_FEATURES;
993 features &= ~NETIF_F_NETNS_LOCAL;
994
995 return features;
996}
997
998#ifdef CONFIG_NET_POLL_CONTROLLER
999static void macvlan_dev_poll_controller(struct net_device *dev)
1000{
1001 return;
1002}
1003
1004static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1005{
1006 struct macvlan_dev *vlan = netdev_priv(dev);
1007 struct net_device *real_dev = vlan->lowerdev;
1008 struct netpoll *netpoll;
1009 int err = 0;
1010
1011 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1012 err = -ENOMEM;
1013 if (!netpoll)
1014 goto out;
1015
1016 err = __netpoll_setup(netpoll, real_dev);
1017 if (err) {
1018 kfree(netpoll);
1019 goto out;
1020 }
1021
1022 vlan->netpoll = netpoll;
1023
1024out:
1025 return err;
1026}
1027
1028static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1029{
1030 struct macvlan_dev *vlan = netdev_priv(dev);
1031 struct netpoll *netpoll = vlan->netpoll;
1032
1033 if (!netpoll)
1034 return;
1035
1036 vlan->netpoll = NULL;
1037
1038 __netpoll_free_async(netpoll);
1039}
1040#endif /* CONFIG_NET_POLL_CONTROLLER */
1041
1042static int macvlan_dev_get_iflink(const struct net_device *dev)
1043{
1044 struct macvlan_dev *vlan = netdev_priv(dev);
1045
1046 return vlan->lowerdev->ifindex;
1047}
1048
1049static const struct ethtool_ops macvlan_ethtool_ops = {
1050 .get_link = ethtool_op_get_link,
1051 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1052 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1053};
1054
1055static const struct net_device_ops macvlan_netdev_ops = {
1056 .ndo_init = macvlan_init,
1057 .ndo_uninit = macvlan_uninit,
1058 .ndo_open = macvlan_open,
1059 .ndo_stop = macvlan_stop,
1060 .ndo_start_xmit = macvlan_start_xmit,
1061 .ndo_change_mtu = macvlan_change_mtu,
1062 .ndo_fix_features = macvlan_fix_features,
1063 .ndo_change_rx_flags = macvlan_change_rx_flags,
1064 .ndo_set_mac_address = macvlan_set_mac_address,
1065 .ndo_set_rx_mode = macvlan_set_mac_lists,
1066 .ndo_get_stats64 = macvlan_dev_get_stats64,
1067 .ndo_validate_addr = eth_validate_addr,
1068 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1069 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1070 .ndo_fdb_add = macvlan_fdb_add,
1071 .ndo_fdb_del = macvlan_fdb_del,
1072 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1073 .ndo_get_lock_subclass = macvlan_get_nest_level,
1074#ifdef CONFIG_NET_POLL_CONTROLLER
1075 .ndo_poll_controller = macvlan_dev_poll_controller,
1076 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1077 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1078#endif
1079 .ndo_get_iflink = macvlan_dev_get_iflink,
1080 .ndo_features_check = passthru_features_check,
1081};
1082
1083void macvlan_common_setup(struct net_device *dev)
1084{
1085 ether_setup(dev);
1086
1087 dev->min_mtu = 0;
1088 dev->max_mtu = ETH_MAX_MTU;
1089 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1090 netif_keep_dst(dev);
1091 dev->priv_flags |= IFF_UNICAST_FLT;
1092 dev->netdev_ops = &macvlan_netdev_ops;
1093 dev->destructor = free_netdev;
1094 dev->header_ops = &macvlan_hard_header_ops;
1095 dev->ethtool_ops = &macvlan_ethtool_ops;
1096}
1097EXPORT_SYMBOL_GPL(macvlan_common_setup);
1098
1099static void macvlan_setup(struct net_device *dev)
1100{
1101 macvlan_common_setup(dev);
1102 dev->priv_flags |= IFF_NO_QUEUE;
1103}
1104
1105static int macvlan_port_create(struct net_device *dev)
1106{
1107 struct macvlan_port *port;
1108 unsigned int i;
1109 int err;
1110
1111 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1112 return -EINVAL;
1113
1114 if (netif_is_ipvlan_port(dev))
1115 return -EBUSY;
1116
1117 port = kzalloc(sizeof(*port), GFP_KERNEL);
1118 if (port == NULL)
1119 return -ENOMEM;
1120
1121 port->passthru = false;
1122 port->dev = dev;
1123 INIT_LIST_HEAD(&port->vlans);
1124 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1125 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1126 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1127 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1128
1129 skb_queue_head_init(&port->bc_queue);
1130 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1131
1132 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1133 if (err)
1134 kfree(port);
1135 else
1136 dev->priv_flags |= IFF_MACVLAN_PORT;
1137 return err;
1138}
1139
1140static void macvlan_port_destroy(struct net_device *dev)
1141{
1142 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1143
1144 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1145 netdev_rx_handler_unregister(dev);
1146
1147 /* After this point, no packet can schedule bc_work anymore,
1148 * but we need to cancel it and purge left skbs if any.
1149 */
1150 cancel_work_sync(&port->bc_work);
1151 __skb_queue_purge(&port->bc_queue);
1152
1153 kfree(port);
1154}
1155
1156static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
1157{
1158 if (tb[IFLA_ADDRESS]) {
1159 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1160 return -EINVAL;
1161 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1162 return -EADDRNOTAVAIL;
1163 }
1164
1165 if (data && data[IFLA_MACVLAN_FLAGS] &&
1166 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1167 return -EINVAL;
1168
1169 if (data && data[IFLA_MACVLAN_MODE]) {
1170 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1171 case MACVLAN_MODE_PRIVATE:
1172 case MACVLAN_MODE_VEPA:
1173 case MACVLAN_MODE_BRIDGE:
1174 case MACVLAN_MODE_PASSTHRU:
1175 case MACVLAN_MODE_SOURCE:
1176 break;
1177 default:
1178 return -EINVAL;
1179 }
1180 }
1181
1182 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1183 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1184 case MACVLAN_MACADDR_ADD:
1185 case MACVLAN_MACADDR_DEL:
1186 case MACVLAN_MACADDR_FLUSH:
1187 case MACVLAN_MACADDR_SET:
1188 break;
1189 default:
1190 return -EINVAL;
1191 }
1192 }
1193
1194 if (data && data[IFLA_MACVLAN_MACADDR]) {
1195 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1196 return -EINVAL;
1197
1198 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1199 return -EADDRNOTAVAIL;
1200 }
1201
1202 if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
1203 return -EINVAL;
1204
1205 return 0;
1206}
1207
1208/**
1209 * reconfigure list of remote source mac address
1210 * (only for macvlan devices in source mode)
1211 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1212 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1213 */
1214static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1215 struct nlattr *data[])
1216{
1217 char *addr = NULL;
1218 int ret, rem, len;
1219 struct nlattr *nla, *head;
1220 struct macvlan_source_entry *entry;
1221
1222 if (data[IFLA_MACVLAN_MACADDR])
1223 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1224
1225 if (mode == MACVLAN_MACADDR_ADD) {
1226 if (!addr)
1227 return -EINVAL;
1228
1229 return macvlan_hash_add_source(vlan, addr);
1230
1231 } else if (mode == MACVLAN_MACADDR_DEL) {
1232 if (!addr)
1233 return -EINVAL;
1234
1235 entry = macvlan_hash_lookup_source(vlan, addr);
1236 if (entry) {
1237 macvlan_hash_del_source(entry);
1238 vlan->macaddr_count--;
1239 }
1240 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1241 macvlan_flush_sources(vlan->port, vlan);
1242 } else if (mode == MACVLAN_MACADDR_SET) {
1243 macvlan_flush_sources(vlan->port, vlan);
1244
1245 if (addr) {
1246 ret = macvlan_hash_add_source(vlan, addr);
1247 if (ret)
1248 return ret;
1249 }
1250
1251 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1252 return 0;
1253
1254 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1255 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1256
1257 nla_for_each_attr(nla, head, len, rem) {
1258 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1259 nla_len(nla) != ETH_ALEN)
1260 continue;
1261
1262 addr = nla_data(nla);
1263 ret = macvlan_hash_add_source(vlan, addr);
1264 if (ret)
1265 return ret;
1266 }
1267 } else {
1268 return -EINVAL;
1269 }
1270
1271 return 0;
1272}
1273
1274int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1275 struct nlattr *tb[], struct nlattr *data[])
1276{
1277 struct macvlan_dev *vlan = netdev_priv(dev);
1278 struct macvlan_port *port;
1279 struct net_device *lowerdev;
1280 int err;
1281 int macmode;
1282 bool create = false;
1283
1284 if (!tb[IFLA_LINK])
1285 return -EINVAL;
1286
1287 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1288 if (lowerdev == NULL)
1289 return -ENODEV;
1290
1291 /* When creating macvlans or macvtaps on top of other macvlans - use
1292 * the real device as the lowerdev.
1293 */
1294 if (netif_is_macvlan(lowerdev))
1295 lowerdev = macvlan_dev_real_dev(lowerdev);
1296
1297 if (!tb[IFLA_MTU])
1298 dev->mtu = lowerdev->mtu;
1299 else if (dev->mtu > lowerdev->mtu)
1300 return -EINVAL;
1301
1302 /* MTU range: 68 - lowerdev->max_mtu */
1303 dev->min_mtu = ETH_MIN_MTU;
1304 dev->max_mtu = lowerdev->max_mtu;
1305
1306 if (!tb[IFLA_ADDRESS])
1307 eth_hw_addr_random(dev);
1308
1309 if (!macvlan_port_exists(lowerdev)) {
1310 err = macvlan_port_create(lowerdev);
1311 if (err < 0)
1312 return err;
1313 create = true;
1314 }
1315 port = macvlan_port_get_rtnl(lowerdev);
1316
1317 /* Only 1 macvlan device can be created in passthru mode */
1318 if (port->passthru) {
1319 /* The macvlan port must be not created this time,
1320 * still goto destroy_macvlan_port for readability.
1321 */
1322 err = -EINVAL;
1323 goto destroy_macvlan_port;
1324 }
1325
1326 vlan->lowerdev = lowerdev;
1327 vlan->dev = dev;
1328 vlan->port = port;
1329 vlan->set_features = MACVLAN_FEATURES;
1330 vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1331
1332 vlan->mode = MACVLAN_MODE_VEPA;
1333 if (data && data[IFLA_MACVLAN_MODE])
1334 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1335
1336 if (data && data[IFLA_MACVLAN_FLAGS])
1337 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1338
1339 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1340 if (port->count) {
1341 err = -EINVAL;
1342 goto destroy_macvlan_port;
1343 }
1344 port->passthru = true;
1345 eth_hw_addr_inherit(dev, lowerdev);
1346 }
1347
1348 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1349 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1350 err = -EINVAL;
1351 goto destroy_macvlan_port;
1352 }
1353 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1354 err = macvlan_changelink_sources(vlan, macmode, data);
1355 if (err)
1356 goto destroy_macvlan_port;
1357 }
1358
1359 err = register_netdevice(dev);
1360 if (err < 0)
1361 goto destroy_macvlan_port;
1362
1363 dev->priv_flags |= IFF_MACVLAN;
1364 err = netdev_upper_dev_link(lowerdev, dev);
1365 if (err)
1366 goto unregister_netdev;
1367
1368 list_add_tail_rcu(&vlan->list, &port->vlans);
1369 netif_stacked_transfer_operstate(lowerdev, dev);
1370 linkwatch_fire_event(dev);
1371
1372 return 0;
1373
1374unregister_netdev:
1375 unregister_netdevice(dev);
1376destroy_macvlan_port:
1377 if (create)
1378 macvlan_port_destroy(port->dev);
1379 return err;
1380}
1381EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1382
1383static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1384 struct nlattr *tb[], struct nlattr *data[])
1385{
1386 return macvlan_common_newlink(src_net, dev, tb, data);
1387}
1388
1389void macvlan_dellink(struct net_device *dev, struct list_head *head)
1390{
1391 struct macvlan_dev *vlan = netdev_priv(dev);
1392
1393 if (vlan->mode == MACVLAN_MODE_SOURCE)
1394 macvlan_flush_sources(vlan->port, vlan);
1395 list_del_rcu(&vlan->list);
1396 unregister_netdevice_queue(dev, head);
1397 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1398}
1399EXPORT_SYMBOL_GPL(macvlan_dellink);
1400
1401static int macvlan_changelink(struct net_device *dev,
1402 struct nlattr *tb[], struct nlattr *data[])
1403{
1404 struct macvlan_dev *vlan = netdev_priv(dev);
1405 enum macvlan_mode mode;
1406 bool set_mode = false;
1407 enum macvlan_macaddr_mode macmode;
1408 int ret;
1409
1410 /* Validate mode, but don't set yet: setting flags may fail. */
1411 if (data && data[IFLA_MACVLAN_MODE]) {
1412 set_mode = true;
1413 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1414 /* Passthrough mode can't be set or cleared dynamically */
1415 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1416 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1417 return -EINVAL;
1418 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1419 vlan->mode != mode)
1420 macvlan_flush_sources(vlan->port, vlan);
1421 }
1422
1423 if (data && data[IFLA_MACVLAN_FLAGS]) {
1424 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1425 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1426 if (vlan->port->passthru && promisc) {
1427 int err;
1428
1429 if (flags & MACVLAN_FLAG_NOPROMISC)
1430 err = dev_set_promiscuity(vlan->lowerdev, -1);
1431 else
1432 err = dev_set_promiscuity(vlan->lowerdev, 1);
1433 if (err < 0)
1434 return err;
1435 }
1436 vlan->flags = flags;
1437 }
1438 if (set_mode)
1439 vlan->mode = mode;
1440 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1441 if (vlan->mode != MACVLAN_MODE_SOURCE)
1442 return -EINVAL;
1443 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1444 ret = macvlan_changelink_sources(vlan, macmode, data);
1445 if (ret)
1446 return ret;
1447 }
1448 return 0;
1449}
1450
1451static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1452{
1453 if (vlan->macaddr_count == 0)
1454 return 0;
1455 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1456 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1457}
1458
1459static size_t macvlan_get_size(const struct net_device *dev)
1460{
1461 struct macvlan_dev *vlan = netdev_priv(dev);
1462
1463 return (0
1464 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1465 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1466 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1467 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1468 );
1469}
1470
1471static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1472 const struct macvlan_dev *vlan,
1473 const int i)
1474{
1475 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1476 struct macvlan_source_entry *entry;
1477
1478 hlist_for_each_entry_rcu(entry, h, hlist) {
1479 if (entry->vlan != vlan)
1480 continue;
1481 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1482 return 1;
1483 }
1484 return 0;
1485}
1486
1487static int macvlan_fill_info(struct sk_buff *skb,
1488 const struct net_device *dev)
1489{
1490 struct macvlan_dev *vlan = netdev_priv(dev);
1491 int i;
1492 struct nlattr *nest;
1493
1494 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1495 goto nla_put_failure;
1496 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1497 goto nla_put_failure;
1498 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1499 goto nla_put_failure;
1500 if (vlan->macaddr_count > 0) {
1501 nest = nla_nest_start(skb, IFLA_MACVLAN_MACADDR_DATA);
1502 if (nest == NULL)
1503 goto nla_put_failure;
1504
1505 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1506 if (macvlan_fill_info_macaddr(skb, vlan, i))
1507 goto nla_put_failure;
1508 }
1509 nla_nest_end(skb, nest);
1510 }
1511 return 0;
1512
1513nla_put_failure:
1514 return -EMSGSIZE;
1515}
1516
1517static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1518 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1519 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1520 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1521 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1522 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1523 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1524};
1525
1526int macvlan_link_register(struct rtnl_link_ops *ops)
1527{
1528 /* common fields */
1529 ops->priv_size = sizeof(struct macvlan_dev);
1530 ops->validate = macvlan_validate;
1531 ops->maxtype = IFLA_MACVLAN_MAX;
1532 ops->policy = macvlan_policy;
1533 ops->changelink = macvlan_changelink;
1534 ops->get_size = macvlan_get_size;
1535 ops->fill_info = macvlan_fill_info;
1536
1537 return rtnl_link_register(ops);
1538};
1539EXPORT_SYMBOL_GPL(macvlan_link_register);
1540
1541static struct net *macvlan_get_link_net(const struct net_device *dev)
1542{
1543 return dev_net(macvlan_dev_real_dev(dev));
1544}
1545
1546static struct rtnl_link_ops macvlan_link_ops = {
1547 .kind = "macvlan",
1548 .setup = macvlan_setup,
1549 .newlink = macvlan_newlink,
1550 .dellink = macvlan_dellink,
1551 .get_link_net = macvlan_get_link_net,
1552};
1553
1554static int macvlan_device_event(struct notifier_block *unused,
1555 unsigned long event, void *ptr)
1556{
1557 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1558 struct macvlan_dev *vlan, *next;
1559 struct macvlan_port *port;
1560 LIST_HEAD(list_kill);
1561
1562 if (!macvlan_port_exists(dev))
1563 return NOTIFY_DONE;
1564
1565 port = macvlan_port_get_rtnl(dev);
1566
1567 switch (event) {
1568 case NETDEV_UP:
1569 case NETDEV_CHANGE:
1570 list_for_each_entry(vlan, &port->vlans, list)
1571 netif_stacked_transfer_operstate(vlan->lowerdev,
1572 vlan->dev);
1573 break;
1574 case NETDEV_FEAT_CHANGE:
1575 list_for_each_entry(vlan, &port->vlans, list) {
1576 vlan->dev->gso_max_size = dev->gso_max_size;
1577 vlan->dev->gso_max_segs = dev->gso_max_segs;
1578 netdev_update_features(vlan->dev);
1579 }
1580 break;
1581 case NETDEV_CHANGEMTU:
1582 list_for_each_entry(vlan, &port->vlans, list) {
1583 if (vlan->dev->mtu <= dev->mtu)
1584 continue;
1585 dev_set_mtu(vlan->dev, dev->mtu);
1586 }
1587 break;
1588 case NETDEV_CHANGEADDR:
1589 if (!port->passthru)
1590 return NOTIFY_DONE;
1591
1592 vlan = list_first_entry_or_null(&port->vlans,
1593 struct macvlan_dev,
1594 list);
1595
1596 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1597 return NOTIFY_BAD;
1598
1599 break;
1600 case NETDEV_UNREGISTER:
1601 /* twiddle thumbs on netns device moves */
1602 if (dev->reg_state != NETREG_UNREGISTERING)
1603 break;
1604
1605 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1606 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1607 unregister_netdevice_many(&list_kill);
1608 break;
1609 case NETDEV_PRE_TYPE_CHANGE:
1610 /* Forbid underlaying device to change its type. */
1611 return NOTIFY_BAD;
1612
1613 case NETDEV_NOTIFY_PEERS:
1614 case NETDEV_BONDING_FAILOVER:
1615 case NETDEV_RESEND_IGMP:
1616 /* Propagate to all vlans */
1617 list_for_each_entry(vlan, &port->vlans, list)
1618 call_netdevice_notifiers(event, vlan->dev);
1619 }
1620 return NOTIFY_DONE;
1621}
1622
1623static struct notifier_block macvlan_notifier_block __read_mostly = {
1624 .notifier_call = macvlan_device_event,
1625};
1626
1627static int __init macvlan_init_module(void)
1628{
1629 int err;
1630
1631 register_netdevice_notifier(&macvlan_notifier_block);
1632
1633 err = macvlan_link_register(&macvlan_link_ops);
1634 if (err < 0)
1635 goto err1;
1636 return 0;
1637err1:
1638 unregister_netdevice_notifier(&macvlan_notifier_block);
1639 return err;
1640}
1641
1642static void __exit macvlan_cleanup_module(void)
1643{
1644 rtnl_link_unregister(&macvlan_link_ops);
1645 unregister_netdevice_notifier(&macvlan_notifier_block);
1646}
1647
1648module_init(macvlan_init_module);
1649module_exit(macvlan_cleanup_module);
1650
1651MODULE_LICENSE("GPL");
1652MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1653MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1654MODULE_ALIAS_RTNL_LINK("macvlan");