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[thirdparty/kernel/stable.git] / drivers / net / macvlan.c
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 <net/rtnetlink.h>
34 #include <net/xfrm.h>
35
36 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
37
38 struct macvlan_port {
39 struct net_device *dev;
40 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
41 struct list_head vlans;
42 struct rcu_head rcu;
43 bool passthru;
44 int count;
45 };
46
47 static void macvlan_port_destroy(struct net_device *dev);
48
49 #define macvlan_port_get_rcu(dev) \
50 ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
51 #define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
52 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
53
54 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
55 const unsigned char *addr)
56 {
57 struct macvlan_dev *vlan;
58
59 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[addr[5]], hlist) {
60 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
61 return vlan;
62 }
63 return NULL;
64 }
65
66 static void macvlan_hash_add(struct macvlan_dev *vlan)
67 {
68 struct macvlan_port *port = vlan->port;
69 const unsigned char *addr = vlan->dev->dev_addr;
70
71 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
72 }
73
74 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
75 {
76 hlist_del_rcu(&vlan->hlist);
77 if (sync)
78 synchronize_rcu();
79 }
80
81 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
82 const unsigned char *addr)
83 {
84 macvlan_hash_del(vlan, true);
85 /* Now that we are unhashed it is safe to change the device
86 * address without confusing packet delivery.
87 */
88 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
89 macvlan_hash_add(vlan);
90 }
91
92 static int macvlan_addr_busy(const struct macvlan_port *port,
93 const unsigned char *addr)
94 {
95 /* Test to see if the specified multicast address is
96 * currently in use by the underlying device or
97 * another macvlan.
98 */
99 if (ether_addr_equal_64bits(port->dev->dev_addr, addr))
100 return 1;
101
102 if (macvlan_hash_lookup(port, addr))
103 return 1;
104
105 return 0;
106 }
107
108
109 static int macvlan_broadcast_one(struct sk_buff *skb,
110 const struct macvlan_dev *vlan,
111 const struct ethhdr *eth, bool local)
112 {
113 struct net_device *dev = vlan->dev;
114 if (!skb)
115 return NET_RX_DROP;
116
117 if (local)
118 return vlan->forward(dev, skb);
119
120 skb->dev = dev;
121 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
122 skb->pkt_type = PACKET_BROADCAST;
123 else
124 skb->pkt_type = PACKET_MULTICAST;
125
126 return vlan->receive(skb);
127 }
128
129 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
130 {
131 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
132 }
133
134
135 static unsigned int mc_hash(const struct macvlan_dev *vlan,
136 const unsigned char *addr)
137 {
138 u32 val = __get_unaligned_cpu32(addr + 2);
139
140 val ^= macvlan_hash_mix(vlan);
141 return hash_32(val, MACVLAN_MC_FILTER_BITS);
142 }
143
144 static void macvlan_broadcast(struct sk_buff *skb,
145 const struct macvlan_port *port,
146 struct net_device *src,
147 enum macvlan_mode mode)
148 {
149 const struct ethhdr *eth = eth_hdr(skb);
150 const struct macvlan_dev *vlan;
151 struct sk_buff *nskb;
152 unsigned int i;
153 int err;
154 unsigned int hash;
155
156 if (skb->protocol == htons(ETH_P_PAUSE))
157 return;
158
159 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
160 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
161 if (vlan->dev == src || !(vlan->mode & mode))
162 continue;
163
164 hash = mc_hash(vlan, eth->h_dest);
165 if (!test_bit(hash, vlan->mc_filter))
166 continue;
167 nskb = skb_clone(skb, GFP_ATOMIC);
168 err = macvlan_broadcast_one(nskb, vlan, eth,
169 mode == MACVLAN_MODE_BRIDGE);
170 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
171 err == NET_RX_SUCCESS, 1);
172 }
173 }
174 }
175
176 /* called under rcu_read_lock() from netif_receive_skb */
177 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
178 {
179 struct macvlan_port *port;
180 struct sk_buff *skb = *pskb;
181 const struct ethhdr *eth = eth_hdr(skb);
182 const struct macvlan_dev *vlan;
183 const struct macvlan_dev *src;
184 struct net_device *dev;
185 unsigned int len = 0;
186 int ret = NET_RX_DROP;
187
188 port = macvlan_port_get_rcu(skb->dev);
189 if (is_multicast_ether_addr(eth->h_dest)) {
190 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
191 if (!skb)
192 return RX_HANDLER_CONSUMED;
193 eth = eth_hdr(skb);
194 src = macvlan_hash_lookup(port, eth->h_source);
195 if (!src)
196 /* frame comes from an external address */
197 macvlan_broadcast(skb, port, NULL,
198 MACVLAN_MODE_PRIVATE |
199 MACVLAN_MODE_VEPA |
200 MACVLAN_MODE_PASSTHRU|
201 MACVLAN_MODE_BRIDGE);
202 else if (src->mode == MACVLAN_MODE_VEPA)
203 /* flood to everyone except source */
204 macvlan_broadcast(skb, port, src->dev,
205 MACVLAN_MODE_VEPA |
206 MACVLAN_MODE_BRIDGE);
207 else if (src->mode == MACVLAN_MODE_BRIDGE)
208 /*
209 * flood only to VEPA ports, bridge ports
210 * already saw the frame on the way out.
211 */
212 macvlan_broadcast(skb, port, src->dev,
213 MACVLAN_MODE_VEPA);
214 else {
215 /* forward to original port. */
216 vlan = src;
217 ret = macvlan_broadcast_one(skb, vlan, eth, 0);
218 goto out;
219 }
220
221 return RX_HANDLER_PASS;
222 }
223
224 if (port->passthru)
225 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
226 else
227 vlan = macvlan_hash_lookup(port, eth->h_dest);
228 if (vlan == NULL)
229 return RX_HANDLER_PASS;
230
231 dev = vlan->dev;
232 if (unlikely(!(dev->flags & IFF_UP))) {
233 kfree_skb(skb);
234 return RX_HANDLER_CONSUMED;
235 }
236 len = skb->len + ETH_HLEN;
237 skb = skb_share_check(skb, GFP_ATOMIC);
238 if (!skb)
239 goto out;
240
241 skb->dev = dev;
242 skb->pkt_type = PACKET_HOST;
243
244 ret = vlan->receive(skb);
245
246 out:
247 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
248 return RX_HANDLER_CONSUMED;
249 }
250
251 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
252 {
253 const struct macvlan_dev *vlan = netdev_priv(dev);
254 const struct macvlan_port *port = vlan->port;
255 const struct macvlan_dev *dest;
256 __u8 ip_summed = skb->ip_summed;
257
258 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
259 const struct ethhdr *eth = (void *)skb->data;
260 skb->ip_summed = CHECKSUM_UNNECESSARY;
261
262 /* send to other bridge ports directly */
263 if (is_multicast_ether_addr(eth->h_dest)) {
264 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
265 goto xmit_world;
266 }
267
268 dest = macvlan_hash_lookup(port, eth->h_dest);
269 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
270 /* send to lowerdev first for its network taps */
271 dev_forward_skb(vlan->lowerdev, skb);
272
273 return NET_XMIT_SUCCESS;
274 }
275 }
276
277 xmit_world:
278 skb->ip_summed = ip_summed;
279 skb->dev = vlan->lowerdev;
280 return dev_queue_xmit(skb);
281 }
282
283 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
284 struct net_device *dev)
285 {
286 unsigned int len = skb->len;
287 int ret;
288 const struct macvlan_dev *vlan = netdev_priv(dev);
289
290 ret = macvlan_queue_xmit(skb, dev);
291 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
292 struct macvlan_pcpu_stats *pcpu_stats;
293
294 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
295 u64_stats_update_begin(&pcpu_stats->syncp);
296 pcpu_stats->tx_packets++;
297 pcpu_stats->tx_bytes += len;
298 u64_stats_update_end(&pcpu_stats->syncp);
299 } else {
300 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
301 }
302 return ret;
303 }
304 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
305
306 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
307 unsigned short type, const void *daddr,
308 const void *saddr, unsigned len)
309 {
310 const struct macvlan_dev *vlan = netdev_priv(dev);
311 struct net_device *lowerdev = vlan->lowerdev;
312
313 return dev_hard_header(skb, lowerdev, type, daddr,
314 saddr ? : dev->dev_addr, len);
315 }
316
317 static const struct header_ops macvlan_hard_header_ops = {
318 .create = macvlan_hard_header,
319 .rebuild = eth_rebuild_header,
320 .parse = eth_header_parse,
321 .cache = eth_header_cache,
322 .cache_update = eth_header_cache_update,
323 };
324
325 static int macvlan_open(struct net_device *dev)
326 {
327 struct macvlan_dev *vlan = netdev_priv(dev);
328 struct net_device *lowerdev = vlan->lowerdev;
329 int err;
330
331 if (vlan->port->passthru) {
332 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
333 dev_set_promiscuity(lowerdev, 1);
334 goto hash_add;
335 }
336
337 err = -EBUSY;
338 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
339 goto out;
340
341 err = dev_uc_add(lowerdev, dev->dev_addr);
342 if (err < 0)
343 goto out;
344 if (dev->flags & IFF_ALLMULTI) {
345 err = dev_set_allmulti(lowerdev, 1);
346 if (err < 0)
347 goto del_unicast;
348 }
349
350 hash_add:
351 macvlan_hash_add(vlan);
352 return 0;
353
354 del_unicast:
355 dev_uc_del(lowerdev, dev->dev_addr);
356 out:
357 return err;
358 }
359
360 static int macvlan_stop(struct net_device *dev)
361 {
362 struct macvlan_dev *vlan = netdev_priv(dev);
363 struct net_device *lowerdev = vlan->lowerdev;
364
365 dev_uc_unsync(lowerdev, dev);
366 dev_mc_unsync(lowerdev, dev);
367
368 if (vlan->port->passthru) {
369 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
370 dev_set_promiscuity(lowerdev, -1);
371 goto hash_del;
372 }
373
374 if (dev->flags & IFF_ALLMULTI)
375 dev_set_allmulti(lowerdev, -1);
376
377 dev_uc_del(lowerdev, dev->dev_addr);
378
379 hash_del:
380 macvlan_hash_del(vlan, !dev->dismantle);
381 return 0;
382 }
383
384 static int macvlan_set_mac_address(struct net_device *dev, void *p)
385 {
386 struct macvlan_dev *vlan = netdev_priv(dev);
387 struct net_device *lowerdev = vlan->lowerdev;
388 struct sockaddr *addr = p;
389 int err;
390
391 if (!is_valid_ether_addr(addr->sa_data))
392 return -EADDRNOTAVAIL;
393
394 if (!(dev->flags & IFF_UP)) {
395 /* Just copy in the new address */
396 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
397 } else {
398 /* Rehash and update the device filters */
399 if (macvlan_addr_busy(vlan->port, addr->sa_data))
400 return -EBUSY;
401
402 err = dev_uc_add(lowerdev, addr->sa_data);
403 if (err)
404 return err;
405
406 dev_uc_del(lowerdev, dev->dev_addr);
407
408 macvlan_hash_change_addr(vlan, addr->sa_data);
409 }
410 return 0;
411 }
412
413 static void macvlan_change_rx_flags(struct net_device *dev, int change)
414 {
415 struct macvlan_dev *vlan = netdev_priv(dev);
416 struct net_device *lowerdev = vlan->lowerdev;
417
418 if (change & IFF_ALLMULTI)
419 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
420 }
421
422 static void macvlan_set_mac_lists(struct net_device *dev)
423 {
424 struct macvlan_dev *vlan = netdev_priv(dev);
425
426 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
427 bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ);
428 } else {
429 struct netdev_hw_addr *ha;
430 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
431
432 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
433 netdev_for_each_mc_addr(ha, dev) {
434 __set_bit(mc_hash(vlan, ha->addr), filter);
435 }
436
437 __set_bit(mc_hash(vlan, dev->broadcast), filter);
438
439 bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ);
440 }
441 dev_uc_sync(vlan->lowerdev, dev);
442 dev_mc_sync(vlan->lowerdev, dev);
443 }
444
445 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
446 {
447 struct macvlan_dev *vlan = netdev_priv(dev);
448
449 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
450 return -EINVAL;
451 dev->mtu = new_mtu;
452 return 0;
453 }
454
455 /*
456 * macvlan network devices have devices nesting below it and are a special
457 * "super class" of normal network devices; split their locks off into a
458 * separate class since they always nest.
459 */
460 static struct lock_class_key macvlan_netdev_xmit_lock_key;
461 static struct lock_class_key macvlan_netdev_addr_lock_key;
462
463 #define MACVLAN_FEATURES \
464 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
465 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
466 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
467 NETIF_F_HW_VLAN_FILTER)
468
469 #define MACVLAN_STATE_MASK \
470 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
471
472 static void macvlan_set_lockdep_class_one(struct net_device *dev,
473 struct netdev_queue *txq,
474 void *_unused)
475 {
476 lockdep_set_class(&txq->_xmit_lock,
477 &macvlan_netdev_xmit_lock_key);
478 }
479
480 static void macvlan_set_lockdep_class(struct net_device *dev)
481 {
482 lockdep_set_class(&dev->addr_list_lock,
483 &macvlan_netdev_addr_lock_key);
484 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
485 }
486
487 static int macvlan_init(struct net_device *dev)
488 {
489 struct macvlan_dev *vlan = netdev_priv(dev);
490 const struct net_device *lowerdev = vlan->lowerdev;
491
492 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
493 (lowerdev->state & MACVLAN_STATE_MASK);
494 dev->features = lowerdev->features & MACVLAN_FEATURES;
495 dev->features |= NETIF_F_LLTX;
496 dev->gso_max_size = lowerdev->gso_max_size;
497 dev->iflink = lowerdev->ifindex;
498 dev->hard_header_len = lowerdev->hard_header_len;
499
500 macvlan_set_lockdep_class(dev);
501
502 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
503 if (!vlan->pcpu_stats)
504 return -ENOMEM;
505
506 return 0;
507 }
508
509 static void macvlan_uninit(struct net_device *dev)
510 {
511 struct macvlan_dev *vlan = netdev_priv(dev);
512 struct macvlan_port *port = vlan->port;
513
514 free_percpu(vlan->pcpu_stats);
515
516 port->count -= 1;
517 if (!port->count)
518 macvlan_port_destroy(port->dev);
519 }
520
521 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
522 struct rtnl_link_stats64 *stats)
523 {
524 struct macvlan_dev *vlan = netdev_priv(dev);
525
526 if (vlan->pcpu_stats) {
527 struct macvlan_pcpu_stats *p;
528 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
529 u32 rx_errors = 0, tx_dropped = 0;
530 unsigned int start;
531 int i;
532
533 for_each_possible_cpu(i) {
534 p = per_cpu_ptr(vlan->pcpu_stats, i);
535 do {
536 start = u64_stats_fetch_begin_bh(&p->syncp);
537 rx_packets = p->rx_packets;
538 rx_bytes = p->rx_bytes;
539 rx_multicast = p->rx_multicast;
540 tx_packets = p->tx_packets;
541 tx_bytes = p->tx_bytes;
542 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
543
544 stats->rx_packets += rx_packets;
545 stats->rx_bytes += rx_bytes;
546 stats->multicast += rx_multicast;
547 stats->tx_packets += tx_packets;
548 stats->tx_bytes += tx_bytes;
549 /* rx_errors & tx_dropped are u32, updated
550 * without syncp protection.
551 */
552 rx_errors += p->rx_errors;
553 tx_dropped += p->tx_dropped;
554 }
555 stats->rx_errors = rx_errors;
556 stats->rx_dropped = rx_errors;
557 stats->tx_dropped = tx_dropped;
558 }
559 return stats;
560 }
561
562 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
563 unsigned short vid)
564 {
565 struct macvlan_dev *vlan = netdev_priv(dev);
566 struct net_device *lowerdev = vlan->lowerdev;
567
568 return vlan_vid_add(lowerdev, vid);
569 }
570
571 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
572 unsigned short vid)
573 {
574 struct macvlan_dev *vlan = netdev_priv(dev);
575 struct net_device *lowerdev = vlan->lowerdev;
576
577 vlan_vid_del(lowerdev, vid);
578 return 0;
579 }
580
581 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
582 struct net_device *dev,
583 const unsigned char *addr,
584 u16 flags)
585 {
586 struct macvlan_dev *vlan = netdev_priv(dev);
587 int err = -EINVAL;
588
589 if (!vlan->port->passthru)
590 return -EOPNOTSUPP;
591
592 if (is_unicast_ether_addr(addr))
593 err = dev_uc_add_excl(dev, addr);
594 else if (is_multicast_ether_addr(addr))
595 err = dev_mc_add_excl(dev, addr);
596
597 return err;
598 }
599
600 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
601 struct net_device *dev,
602 const unsigned char *addr)
603 {
604 struct macvlan_dev *vlan = netdev_priv(dev);
605 int err = -EINVAL;
606
607 if (!vlan->port->passthru)
608 return -EOPNOTSUPP;
609
610 if (is_unicast_ether_addr(addr))
611 err = dev_uc_del(dev, addr);
612 else if (is_multicast_ether_addr(addr))
613 err = dev_mc_del(dev, addr);
614
615 return err;
616 }
617
618 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
619 struct ethtool_drvinfo *drvinfo)
620 {
621 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
622 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
623 }
624
625 static int macvlan_ethtool_get_settings(struct net_device *dev,
626 struct ethtool_cmd *cmd)
627 {
628 const struct macvlan_dev *vlan = netdev_priv(dev);
629
630 return __ethtool_get_settings(vlan->lowerdev, cmd);
631 }
632
633 static const struct ethtool_ops macvlan_ethtool_ops = {
634 .get_link = ethtool_op_get_link,
635 .get_settings = macvlan_ethtool_get_settings,
636 .get_drvinfo = macvlan_ethtool_get_drvinfo,
637 };
638
639 static const struct net_device_ops macvlan_netdev_ops = {
640 .ndo_init = macvlan_init,
641 .ndo_uninit = macvlan_uninit,
642 .ndo_open = macvlan_open,
643 .ndo_stop = macvlan_stop,
644 .ndo_start_xmit = macvlan_start_xmit,
645 .ndo_change_mtu = macvlan_change_mtu,
646 .ndo_change_rx_flags = macvlan_change_rx_flags,
647 .ndo_set_mac_address = macvlan_set_mac_address,
648 .ndo_set_rx_mode = macvlan_set_mac_lists,
649 .ndo_get_stats64 = macvlan_dev_get_stats64,
650 .ndo_validate_addr = eth_validate_addr,
651 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
652 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
653 .ndo_fdb_add = macvlan_fdb_add,
654 .ndo_fdb_del = macvlan_fdb_del,
655 .ndo_fdb_dump = ndo_dflt_fdb_dump,
656 };
657
658 void macvlan_common_setup(struct net_device *dev)
659 {
660 ether_setup(dev);
661
662 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
663 dev->netdev_ops = &macvlan_netdev_ops;
664 dev->destructor = free_netdev;
665 dev->header_ops = &macvlan_hard_header_ops,
666 dev->ethtool_ops = &macvlan_ethtool_ops;
667 }
668 EXPORT_SYMBOL_GPL(macvlan_common_setup);
669
670 static void macvlan_setup(struct net_device *dev)
671 {
672 macvlan_common_setup(dev);
673 dev->tx_queue_len = 0;
674 }
675
676 static int macvlan_port_create(struct net_device *dev)
677 {
678 struct macvlan_port *port;
679 unsigned int i;
680 int err;
681
682 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
683 return -EINVAL;
684
685 port = kzalloc(sizeof(*port), GFP_KERNEL);
686 if (port == NULL)
687 return -ENOMEM;
688
689 port->passthru = false;
690 port->dev = dev;
691 INIT_LIST_HEAD(&port->vlans);
692 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
693 INIT_HLIST_HEAD(&port->vlan_hash[i]);
694
695 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
696 if (err)
697 kfree(port);
698 else
699 dev->priv_flags |= IFF_MACVLAN_PORT;
700 return err;
701 }
702
703 static void macvlan_port_destroy(struct net_device *dev)
704 {
705 struct macvlan_port *port = macvlan_port_get(dev);
706
707 dev->priv_flags &= ~IFF_MACVLAN_PORT;
708 netdev_rx_handler_unregister(dev);
709 kfree_rcu(port, rcu);
710 }
711
712 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
713 {
714 if (tb[IFLA_ADDRESS]) {
715 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
716 return -EINVAL;
717 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
718 return -EADDRNOTAVAIL;
719 }
720
721 if (data && data[IFLA_MACVLAN_MODE]) {
722 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
723 case MACVLAN_MODE_PRIVATE:
724 case MACVLAN_MODE_VEPA:
725 case MACVLAN_MODE_BRIDGE:
726 case MACVLAN_MODE_PASSTHRU:
727 break;
728 default:
729 return -EINVAL;
730 }
731 }
732 return 0;
733 }
734
735 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
736 struct nlattr *tb[], struct nlattr *data[],
737 int (*receive)(struct sk_buff *skb),
738 int (*forward)(struct net_device *dev,
739 struct sk_buff *skb))
740 {
741 struct macvlan_dev *vlan = netdev_priv(dev);
742 struct macvlan_port *port;
743 struct net_device *lowerdev;
744 int err;
745
746 if (!tb[IFLA_LINK])
747 return -EINVAL;
748
749 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
750 if (lowerdev == NULL)
751 return -ENODEV;
752
753 /* When creating macvlans on top of other macvlans - use
754 * the real device as the lowerdev.
755 */
756 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
757 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
758 lowerdev = lowervlan->lowerdev;
759 }
760
761 if (!tb[IFLA_MTU])
762 dev->mtu = lowerdev->mtu;
763 else if (dev->mtu > lowerdev->mtu)
764 return -EINVAL;
765
766 if (!tb[IFLA_ADDRESS])
767 eth_hw_addr_random(dev);
768
769 if (!macvlan_port_exists(lowerdev)) {
770 err = macvlan_port_create(lowerdev);
771 if (err < 0)
772 return err;
773 }
774 port = macvlan_port_get(lowerdev);
775
776 /* Only 1 macvlan device can be created in passthru mode */
777 if (port->passthru)
778 return -EINVAL;
779
780 vlan->lowerdev = lowerdev;
781 vlan->dev = dev;
782 vlan->port = port;
783 vlan->receive = receive;
784 vlan->forward = forward;
785
786 vlan->mode = MACVLAN_MODE_VEPA;
787 if (data && data[IFLA_MACVLAN_MODE])
788 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
789
790 if (data && data[IFLA_MACVLAN_FLAGS])
791 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
792
793 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
794 if (port->count)
795 return -EINVAL;
796 port->passthru = true;
797 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
798 }
799
800 err = netdev_upper_dev_link(lowerdev, dev);
801 if (err)
802 goto destroy_port;
803
804 port->count += 1;
805 err = register_netdevice(dev);
806 if (err < 0)
807 goto upper_dev_unlink;
808
809 list_add_tail(&vlan->list, &port->vlans);
810 netif_stacked_transfer_operstate(lowerdev, dev);
811
812 return 0;
813
814 upper_dev_unlink:
815 netdev_upper_dev_unlink(lowerdev, dev);
816 destroy_port:
817 port->count -= 1;
818 if (!port->count)
819 macvlan_port_destroy(lowerdev);
820
821 return err;
822 }
823 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
824
825 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
826 struct nlattr *tb[], struct nlattr *data[])
827 {
828 return macvlan_common_newlink(src_net, dev, tb, data,
829 netif_rx,
830 dev_forward_skb);
831 }
832
833 void macvlan_dellink(struct net_device *dev, struct list_head *head)
834 {
835 struct macvlan_dev *vlan = netdev_priv(dev);
836
837 list_del(&vlan->list);
838 unregister_netdevice_queue(dev, head);
839 netdev_upper_dev_unlink(vlan->lowerdev, dev);
840 }
841 EXPORT_SYMBOL_GPL(macvlan_dellink);
842
843 static int macvlan_changelink(struct net_device *dev,
844 struct nlattr *tb[], struct nlattr *data[])
845 {
846 struct macvlan_dev *vlan = netdev_priv(dev);
847 if (data && data[IFLA_MACVLAN_MODE])
848 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
849 if (data && data[IFLA_MACVLAN_FLAGS]) {
850 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
851 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
852
853 if (promisc && (flags & MACVLAN_FLAG_NOPROMISC))
854 dev_set_promiscuity(vlan->lowerdev, -1);
855 else if (promisc && !(flags & MACVLAN_FLAG_NOPROMISC))
856 dev_set_promiscuity(vlan->lowerdev, 1);
857 vlan->flags = flags;
858 }
859 return 0;
860 }
861
862 static size_t macvlan_get_size(const struct net_device *dev)
863 {
864 return (0
865 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
866 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
867 );
868 }
869
870 static int macvlan_fill_info(struct sk_buff *skb,
871 const struct net_device *dev)
872 {
873 struct macvlan_dev *vlan = netdev_priv(dev);
874
875 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
876 goto nla_put_failure;
877 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
878 goto nla_put_failure;
879 return 0;
880
881 nla_put_failure:
882 return -EMSGSIZE;
883 }
884
885 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
886 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
887 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
888 };
889
890 int macvlan_link_register(struct rtnl_link_ops *ops)
891 {
892 /* common fields */
893 ops->priv_size = sizeof(struct macvlan_dev);
894 ops->validate = macvlan_validate;
895 ops->maxtype = IFLA_MACVLAN_MAX;
896 ops->policy = macvlan_policy;
897 ops->changelink = macvlan_changelink;
898 ops->get_size = macvlan_get_size;
899 ops->fill_info = macvlan_fill_info;
900
901 return rtnl_link_register(ops);
902 };
903 EXPORT_SYMBOL_GPL(macvlan_link_register);
904
905 static struct rtnl_link_ops macvlan_link_ops = {
906 .kind = "macvlan",
907 .setup = macvlan_setup,
908 .newlink = macvlan_newlink,
909 .dellink = macvlan_dellink,
910 };
911
912 static int macvlan_device_event(struct notifier_block *unused,
913 unsigned long event, void *ptr)
914 {
915 struct net_device *dev = ptr;
916 struct macvlan_dev *vlan, *next;
917 struct macvlan_port *port;
918 LIST_HEAD(list_kill);
919
920 if (!macvlan_port_exists(dev))
921 return NOTIFY_DONE;
922
923 port = macvlan_port_get(dev);
924
925 switch (event) {
926 case NETDEV_CHANGE:
927 list_for_each_entry(vlan, &port->vlans, list)
928 netif_stacked_transfer_operstate(vlan->lowerdev,
929 vlan->dev);
930 break;
931 case NETDEV_FEAT_CHANGE:
932 list_for_each_entry(vlan, &port->vlans, list) {
933 vlan->dev->features = dev->features & MACVLAN_FEATURES;
934 vlan->dev->gso_max_size = dev->gso_max_size;
935 netdev_features_change(vlan->dev);
936 }
937 break;
938 case NETDEV_UNREGISTER:
939 /* twiddle thumbs on netns device moves */
940 if (dev->reg_state != NETREG_UNREGISTERING)
941 break;
942
943 list_for_each_entry_safe(vlan, next, &port->vlans, list)
944 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
945 unregister_netdevice_many(&list_kill);
946 list_del(&list_kill);
947 break;
948 case NETDEV_PRE_TYPE_CHANGE:
949 /* Forbid underlaying device to change its type. */
950 return NOTIFY_BAD;
951 }
952 return NOTIFY_DONE;
953 }
954
955 static struct notifier_block macvlan_notifier_block __read_mostly = {
956 .notifier_call = macvlan_device_event,
957 };
958
959 static int __init macvlan_init_module(void)
960 {
961 int err;
962
963 register_netdevice_notifier(&macvlan_notifier_block);
964
965 err = macvlan_link_register(&macvlan_link_ops);
966 if (err < 0)
967 goto err1;
968 return 0;
969 err1:
970 unregister_netdevice_notifier(&macvlan_notifier_block);
971 return err;
972 }
973
974 static void __exit macvlan_cleanup_module(void)
975 {
976 rtnl_link_unregister(&macvlan_link_ops);
977 unregister_netdevice_notifier(&macvlan_notifier_block);
978 }
979
980 module_init(macvlan_init_module);
981 module_exit(macvlan_cleanup_module);
982
983 MODULE_LICENSE("GPL");
984 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
985 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
986 MODULE_ALIAS_RTNL_LINK("macvlan");
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git