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ethtool: fix drvinfo strings set in drivers
[GitHub/mt8127/android_kernel_alcatel_ttab.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 <net/rtnetlink.h>
33 #include <net/xfrm.h>
34
35 #define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
36
37 struct macvlan_port {
38 struct net_device *dev;
39 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
40 struct list_head vlans;
41 struct rcu_head rcu;
42 bool passthru;
43 int count;
44 };
45
46 static void macvlan_port_destroy(struct net_device *dev);
47
48 #define macvlan_port_get_rcu(dev) \
49 ((struct macvlan_port *) rcu_dereference(dev->rx_handler_data))
50 #define macvlan_port_get(dev) ((struct macvlan_port *) dev->rx_handler_data)
51 #define macvlan_port_exists(dev) (dev->priv_flags & IFF_MACVLAN_PORT)
52
53 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
54 const unsigned char *addr)
55 {
56 struct macvlan_dev *vlan;
57 struct hlist_node *n;
58
59 hlist_for_each_entry_rcu(vlan, n, &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 void macvlan_broadcast(struct sk_buff *skb,
130 const struct macvlan_port *port,
131 struct net_device *src,
132 enum macvlan_mode mode)
133 {
134 const struct ethhdr *eth = eth_hdr(skb);
135 const struct macvlan_dev *vlan;
136 struct hlist_node *n;
137 struct sk_buff *nskb;
138 unsigned int i;
139 int err;
140
141 if (skb->protocol == htons(ETH_P_PAUSE))
142 return;
143
144 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
145 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
146 if (vlan->dev == src || !(vlan->mode & mode))
147 continue;
148
149 nskb = skb_clone(skb, GFP_ATOMIC);
150 err = macvlan_broadcast_one(nskb, vlan, eth,
151 mode == MACVLAN_MODE_BRIDGE);
152 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
153 err == NET_RX_SUCCESS, 1);
154 }
155 }
156 }
157
158 /* called under rcu_read_lock() from netif_receive_skb */
159 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
160 {
161 struct macvlan_port *port;
162 struct sk_buff *skb = *pskb;
163 const struct ethhdr *eth = eth_hdr(skb);
164 const struct macvlan_dev *vlan;
165 const struct macvlan_dev *src;
166 struct net_device *dev;
167 unsigned int len = 0;
168 int ret = NET_RX_DROP;
169
170 port = macvlan_port_get_rcu(skb->dev);
171 if (is_multicast_ether_addr(eth->h_dest)) {
172 skb = ip_check_defrag(skb, IP_DEFRAG_MACVLAN);
173 if (!skb)
174 return RX_HANDLER_CONSUMED;
175 eth = eth_hdr(skb);
176 src = macvlan_hash_lookup(port, eth->h_source);
177 if (!src)
178 /* frame comes from an external address */
179 macvlan_broadcast(skb, port, NULL,
180 MACVLAN_MODE_PRIVATE |
181 MACVLAN_MODE_VEPA |
182 MACVLAN_MODE_PASSTHRU|
183 MACVLAN_MODE_BRIDGE);
184 else if (src->mode == MACVLAN_MODE_VEPA)
185 /* flood to everyone except source */
186 macvlan_broadcast(skb, port, src->dev,
187 MACVLAN_MODE_VEPA |
188 MACVLAN_MODE_BRIDGE);
189 else if (src->mode == MACVLAN_MODE_BRIDGE)
190 /*
191 * flood only to VEPA ports, bridge ports
192 * already saw the frame on the way out.
193 */
194 macvlan_broadcast(skb, port, src->dev,
195 MACVLAN_MODE_VEPA);
196 else {
197 /* forward to original port. */
198 vlan = src;
199 ret = macvlan_broadcast_one(skb, vlan, eth, 0);
200 goto out;
201 }
202
203 return RX_HANDLER_PASS;
204 }
205
206 if (port->passthru)
207 vlan = list_first_entry(&port->vlans, struct macvlan_dev, list);
208 else
209 vlan = macvlan_hash_lookup(port, eth->h_dest);
210 if (vlan == NULL)
211 return RX_HANDLER_PASS;
212
213 dev = vlan->dev;
214 if (unlikely(!(dev->flags & IFF_UP))) {
215 kfree_skb(skb);
216 return RX_HANDLER_CONSUMED;
217 }
218 len = skb->len + ETH_HLEN;
219 skb = skb_share_check(skb, GFP_ATOMIC);
220 if (!skb)
221 goto out;
222
223 skb->dev = dev;
224 skb->pkt_type = PACKET_HOST;
225
226 ret = vlan->receive(skb);
227
228 out:
229 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, 0);
230 return RX_HANDLER_CONSUMED;
231 }
232
233 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
234 {
235 const struct macvlan_dev *vlan = netdev_priv(dev);
236 const struct macvlan_port *port = vlan->port;
237 const struct macvlan_dev *dest;
238 __u8 ip_summed = skb->ip_summed;
239
240 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
241 const struct ethhdr *eth = (void *)skb->data;
242 skb->ip_summed = CHECKSUM_UNNECESSARY;
243
244 /* send to other bridge ports directly */
245 if (is_multicast_ether_addr(eth->h_dest)) {
246 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
247 goto xmit_world;
248 }
249
250 dest = macvlan_hash_lookup(port, eth->h_dest);
251 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
252 /* send to lowerdev first for its network taps */
253 dev_forward_skb(vlan->lowerdev, skb);
254
255 return NET_XMIT_SUCCESS;
256 }
257 }
258
259 xmit_world:
260 skb->ip_summed = ip_summed;
261 skb->dev = vlan->lowerdev;
262 return dev_queue_xmit(skb);
263 }
264
265 netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
266 struct net_device *dev)
267 {
268 unsigned int len = skb->len;
269 int ret;
270 const struct macvlan_dev *vlan = netdev_priv(dev);
271
272 ret = macvlan_queue_xmit(skb, dev);
273 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
274 struct macvlan_pcpu_stats *pcpu_stats;
275
276 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
277 u64_stats_update_begin(&pcpu_stats->syncp);
278 pcpu_stats->tx_packets++;
279 pcpu_stats->tx_bytes += len;
280 u64_stats_update_end(&pcpu_stats->syncp);
281 } else {
282 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
283 }
284 return ret;
285 }
286 EXPORT_SYMBOL_GPL(macvlan_start_xmit);
287
288 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
289 unsigned short type, const void *daddr,
290 const void *saddr, unsigned len)
291 {
292 const struct macvlan_dev *vlan = netdev_priv(dev);
293 struct net_device *lowerdev = vlan->lowerdev;
294
295 return dev_hard_header(skb, lowerdev, type, daddr,
296 saddr ? : dev->dev_addr, len);
297 }
298
299 static const struct header_ops macvlan_hard_header_ops = {
300 .create = macvlan_hard_header,
301 .rebuild = eth_rebuild_header,
302 .parse = eth_header_parse,
303 .cache = eth_header_cache,
304 .cache_update = eth_header_cache_update,
305 };
306
307 static int macvlan_open(struct net_device *dev)
308 {
309 struct macvlan_dev *vlan = netdev_priv(dev);
310 struct net_device *lowerdev = vlan->lowerdev;
311 int err;
312
313 if (vlan->port->passthru) {
314 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
315 dev_set_promiscuity(lowerdev, 1);
316 goto hash_add;
317 }
318
319 err = -EBUSY;
320 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
321 goto out;
322
323 err = dev_uc_add(lowerdev, dev->dev_addr);
324 if (err < 0)
325 goto out;
326 if (dev->flags & IFF_ALLMULTI) {
327 err = dev_set_allmulti(lowerdev, 1);
328 if (err < 0)
329 goto del_unicast;
330 }
331
332 hash_add:
333 macvlan_hash_add(vlan);
334 return 0;
335
336 del_unicast:
337 dev_uc_del(lowerdev, dev->dev_addr);
338 out:
339 return err;
340 }
341
342 static int macvlan_stop(struct net_device *dev)
343 {
344 struct macvlan_dev *vlan = netdev_priv(dev);
345 struct net_device *lowerdev = vlan->lowerdev;
346
347 dev_uc_unsync(lowerdev, dev);
348 dev_mc_unsync(lowerdev, dev);
349
350 if (vlan->port->passthru) {
351 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
352 dev_set_promiscuity(lowerdev, -1);
353 goto hash_del;
354 }
355
356 if (dev->flags & IFF_ALLMULTI)
357 dev_set_allmulti(lowerdev, -1);
358
359 dev_uc_del(lowerdev, dev->dev_addr);
360
361 hash_del:
362 macvlan_hash_del(vlan, !dev->dismantle);
363 return 0;
364 }
365
366 static int macvlan_set_mac_address(struct net_device *dev, void *p)
367 {
368 struct macvlan_dev *vlan = netdev_priv(dev);
369 struct net_device *lowerdev = vlan->lowerdev;
370 struct sockaddr *addr = p;
371 int err;
372
373 if (!is_valid_ether_addr(addr->sa_data))
374 return -EADDRNOTAVAIL;
375
376 if (!(dev->flags & IFF_UP)) {
377 /* Just copy in the new address */
378 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
379 } else {
380 /* Rehash and update the device filters */
381 if (macvlan_addr_busy(vlan->port, addr->sa_data))
382 return -EBUSY;
383
384 err = dev_uc_add(lowerdev, addr->sa_data);
385 if (err)
386 return err;
387
388 dev_uc_del(lowerdev, dev->dev_addr);
389
390 macvlan_hash_change_addr(vlan, addr->sa_data);
391 }
392 return 0;
393 }
394
395 static void macvlan_change_rx_flags(struct net_device *dev, int change)
396 {
397 struct macvlan_dev *vlan = netdev_priv(dev);
398 struct net_device *lowerdev = vlan->lowerdev;
399
400 if (change & IFF_ALLMULTI)
401 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
402 }
403
404 static void macvlan_set_mac_lists(struct net_device *dev)
405 {
406 struct macvlan_dev *vlan = netdev_priv(dev);
407
408 dev_uc_sync(vlan->lowerdev, dev);
409 dev_mc_sync(vlan->lowerdev, dev);
410 }
411
412 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
413 {
414 struct macvlan_dev *vlan = netdev_priv(dev);
415
416 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
417 return -EINVAL;
418 dev->mtu = new_mtu;
419 return 0;
420 }
421
422 /*
423 * macvlan network devices have devices nesting below it and are a special
424 * "super class" of normal network devices; split their locks off into a
425 * separate class since they always nest.
426 */
427 static struct lock_class_key macvlan_netdev_xmit_lock_key;
428 static struct lock_class_key macvlan_netdev_addr_lock_key;
429
430 #define MACVLAN_FEATURES \
431 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
432 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
433 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
434 NETIF_F_HW_VLAN_FILTER)
435
436 #define MACVLAN_STATE_MASK \
437 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
438
439 static void macvlan_set_lockdep_class_one(struct net_device *dev,
440 struct netdev_queue *txq,
441 void *_unused)
442 {
443 lockdep_set_class(&txq->_xmit_lock,
444 &macvlan_netdev_xmit_lock_key);
445 }
446
447 static void macvlan_set_lockdep_class(struct net_device *dev)
448 {
449 lockdep_set_class(&dev->addr_list_lock,
450 &macvlan_netdev_addr_lock_key);
451 netdev_for_each_tx_queue(dev, macvlan_set_lockdep_class_one, NULL);
452 }
453
454 static int macvlan_init(struct net_device *dev)
455 {
456 struct macvlan_dev *vlan = netdev_priv(dev);
457 const struct net_device *lowerdev = vlan->lowerdev;
458
459 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
460 (lowerdev->state & MACVLAN_STATE_MASK);
461 dev->features = lowerdev->features & MACVLAN_FEATURES;
462 dev->features |= NETIF_F_LLTX;
463 dev->gso_max_size = lowerdev->gso_max_size;
464 dev->iflink = lowerdev->ifindex;
465 dev->hard_header_len = lowerdev->hard_header_len;
466
467 macvlan_set_lockdep_class(dev);
468
469 vlan->pcpu_stats = alloc_percpu(struct macvlan_pcpu_stats);
470 if (!vlan->pcpu_stats)
471 return -ENOMEM;
472
473 return 0;
474 }
475
476 static void macvlan_uninit(struct net_device *dev)
477 {
478 struct macvlan_dev *vlan = netdev_priv(dev);
479 struct macvlan_port *port = vlan->port;
480
481 free_percpu(vlan->pcpu_stats);
482
483 port->count -= 1;
484 if (!port->count)
485 macvlan_port_destroy(port->dev);
486 }
487
488 static struct rtnl_link_stats64 *macvlan_dev_get_stats64(struct net_device *dev,
489 struct rtnl_link_stats64 *stats)
490 {
491 struct macvlan_dev *vlan = netdev_priv(dev);
492
493 if (vlan->pcpu_stats) {
494 struct macvlan_pcpu_stats *p;
495 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
496 u32 rx_errors = 0, tx_dropped = 0;
497 unsigned int start;
498 int i;
499
500 for_each_possible_cpu(i) {
501 p = per_cpu_ptr(vlan->pcpu_stats, i);
502 do {
503 start = u64_stats_fetch_begin_bh(&p->syncp);
504 rx_packets = p->rx_packets;
505 rx_bytes = p->rx_bytes;
506 rx_multicast = p->rx_multicast;
507 tx_packets = p->tx_packets;
508 tx_bytes = p->tx_bytes;
509 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
510
511 stats->rx_packets += rx_packets;
512 stats->rx_bytes += rx_bytes;
513 stats->multicast += rx_multicast;
514 stats->tx_packets += tx_packets;
515 stats->tx_bytes += tx_bytes;
516 /* rx_errors & tx_dropped are u32, updated
517 * without syncp protection.
518 */
519 rx_errors += p->rx_errors;
520 tx_dropped += p->tx_dropped;
521 }
522 stats->rx_errors = rx_errors;
523 stats->rx_dropped = rx_errors;
524 stats->tx_dropped = tx_dropped;
525 }
526 return stats;
527 }
528
529 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
530 unsigned short vid)
531 {
532 struct macvlan_dev *vlan = netdev_priv(dev);
533 struct net_device *lowerdev = vlan->lowerdev;
534
535 return vlan_vid_add(lowerdev, vid);
536 }
537
538 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
539 unsigned short vid)
540 {
541 struct macvlan_dev *vlan = netdev_priv(dev);
542 struct net_device *lowerdev = vlan->lowerdev;
543
544 vlan_vid_del(lowerdev, vid);
545 return 0;
546 }
547
548 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
549 struct net_device *dev,
550 const unsigned char *addr,
551 u16 flags)
552 {
553 struct macvlan_dev *vlan = netdev_priv(dev);
554 int err = -EINVAL;
555
556 if (!vlan->port->passthru)
557 return -EOPNOTSUPP;
558
559 if (is_unicast_ether_addr(addr))
560 err = dev_uc_add_excl(dev, addr);
561 else if (is_multicast_ether_addr(addr))
562 err = dev_mc_add_excl(dev, addr);
563
564 return err;
565 }
566
567 static int macvlan_fdb_del(struct ndmsg *ndm,
568 struct net_device *dev,
569 const unsigned char *addr)
570 {
571 struct macvlan_dev *vlan = netdev_priv(dev);
572 int err = -EINVAL;
573
574 if (!vlan->port->passthru)
575 return -EOPNOTSUPP;
576
577 if (is_unicast_ether_addr(addr))
578 err = dev_uc_del(dev, addr);
579 else if (is_multicast_ether_addr(addr))
580 err = dev_mc_del(dev, addr);
581
582 return err;
583 }
584
585 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
586 struct ethtool_drvinfo *drvinfo)
587 {
588 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
589 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
590 }
591
592 static int macvlan_ethtool_get_settings(struct net_device *dev,
593 struct ethtool_cmd *cmd)
594 {
595 const struct macvlan_dev *vlan = netdev_priv(dev);
596
597 return __ethtool_get_settings(vlan->lowerdev, cmd);
598 }
599
600 static const struct ethtool_ops macvlan_ethtool_ops = {
601 .get_link = ethtool_op_get_link,
602 .get_settings = macvlan_ethtool_get_settings,
603 .get_drvinfo = macvlan_ethtool_get_drvinfo,
604 };
605
606 static const struct net_device_ops macvlan_netdev_ops = {
607 .ndo_init = macvlan_init,
608 .ndo_uninit = macvlan_uninit,
609 .ndo_open = macvlan_open,
610 .ndo_stop = macvlan_stop,
611 .ndo_start_xmit = macvlan_start_xmit,
612 .ndo_change_mtu = macvlan_change_mtu,
613 .ndo_change_rx_flags = macvlan_change_rx_flags,
614 .ndo_set_mac_address = macvlan_set_mac_address,
615 .ndo_set_rx_mode = macvlan_set_mac_lists,
616 .ndo_get_stats64 = macvlan_dev_get_stats64,
617 .ndo_validate_addr = eth_validate_addr,
618 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
619 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
620 .ndo_fdb_add = macvlan_fdb_add,
621 .ndo_fdb_del = macvlan_fdb_del,
622 .ndo_fdb_dump = ndo_dflt_fdb_dump,
623 };
624
625 void macvlan_common_setup(struct net_device *dev)
626 {
627 ether_setup(dev);
628
629 dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
630 dev->netdev_ops = &macvlan_netdev_ops;
631 dev->destructor = free_netdev;
632 dev->header_ops = &macvlan_hard_header_ops,
633 dev->ethtool_ops = &macvlan_ethtool_ops;
634 }
635 EXPORT_SYMBOL_GPL(macvlan_common_setup);
636
637 static void macvlan_setup(struct net_device *dev)
638 {
639 macvlan_common_setup(dev);
640 dev->tx_queue_len = 0;
641 }
642
643 static int macvlan_port_create(struct net_device *dev)
644 {
645 struct macvlan_port *port;
646 unsigned int i;
647 int err;
648
649 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
650 return -EINVAL;
651
652 port = kzalloc(sizeof(*port), GFP_KERNEL);
653 if (port == NULL)
654 return -ENOMEM;
655
656 port->passthru = false;
657 port->dev = dev;
658 INIT_LIST_HEAD(&port->vlans);
659 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
660 INIT_HLIST_HEAD(&port->vlan_hash[i]);
661
662 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
663 if (err)
664 kfree(port);
665 else
666 dev->priv_flags |= IFF_MACVLAN_PORT;
667 return err;
668 }
669
670 static void macvlan_port_destroy(struct net_device *dev)
671 {
672 struct macvlan_port *port = macvlan_port_get(dev);
673
674 dev->priv_flags &= ~IFF_MACVLAN_PORT;
675 netdev_rx_handler_unregister(dev);
676 kfree_rcu(port, rcu);
677 }
678
679 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
680 {
681 if (tb[IFLA_ADDRESS]) {
682 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
683 return -EINVAL;
684 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
685 return -EADDRNOTAVAIL;
686 }
687
688 if (data && data[IFLA_MACVLAN_MODE]) {
689 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
690 case MACVLAN_MODE_PRIVATE:
691 case MACVLAN_MODE_VEPA:
692 case MACVLAN_MODE_BRIDGE:
693 case MACVLAN_MODE_PASSTHRU:
694 break;
695 default:
696 return -EINVAL;
697 }
698 }
699 return 0;
700 }
701
702 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
703 struct nlattr *tb[], struct nlattr *data[],
704 int (*receive)(struct sk_buff *skb),
705 int (*forward)(struct net_device *dev,
706 struct sk_buff *skb))
707 {
708 struct macvlan_dev *vlan = netdev_priv(dev);
709 struct macvlan_port *port;
710 struct net_device *lowerdev;
711 int err;
712
713 if (!tb[IFLA_LINK])
714 return -EINVAL;
715
716 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
717 if (lowerdev == NULL)
718 return -ENODEV;
719
720 /* When creating macvlans on top of other macvlans - use
721 * the real device as the lowerdev.
722 */
723 if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
724 struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
725 lowerdev = lowervlan->lowerdev;
726 }
727
728 if (!tb[IFLA_MTU])
729 dev->mtu = lowerdev->mtu;
730 else if (dev->mtu > lowerdev->mtu)
731 return -EINVAL;
732
733 if (!tb[IFLA_ADDRESS])
734 eth_hw_addr_random(dev);
735
736 if (!macvlan_port_exists(lowerdev)) {
737 err = macvlan_port_create(lowerdev);
738 if (err < 0)
739 return err;
740 }
741 port = macvlan_port_get(lowerdev);
742
743 /* Only 1 macvlan device can be created in passthru mode */
744 if (port->passthru)
745 return -EINVAL;
746
747 vlan->lowerdev = lowerdev;
748 vlan->dev = dev;
749 vlan->port = port;
750 vlan->receive = receive;
751 vlan->forward = forward;
752
753 vlan->mode = MACVLAN_MODE_VEPA;
754 if (data && data[IFLA_MACVLAN_MODE])
755 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
756
757 if (data && data[IFLA_MACVLAN_FLAGS])
758 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
759
760 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
761 if (port->count)
762 return -EINVAL;
763 port->passthru = true;
764 memcpy(dev->dev_addr, lowerdev->dev_addr, ETH_ALEN);
765 }
766
767 err = netdev_upper_dev_link(lowerdev, dev);
768 if (err)
769 goto destroy_port;
770
771 port->count += 1;
772 err = register_netdevice(dev);
773 if (err < 0)
774 goto upper_dev_unlink;
775
776 list_add_tail(&vlan->list, &port->vlans);
777 netif_stacked_transfer_operstate(lowerdev, dev);
778
779 return 0;
780
781 upper_dev_unlink:
782 netdev_upper_dev_unlink(lowerdev, dev);
783 destroy_port:
784 port->count -= 1;
785 if (!port->count)
786 macvlan_port_destroy(lowerdev);
787
788 return err;
789 }
790 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
791
792 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
793 struct nlattr *tb[], struct nlattr *data[])
794 {
795 return macvlan_common_newlink(src_net, dev, tb, data,
796 netif_rx,
797 dev_forward_skb);
798 }
799
800 void macvlan_dellink(struct net_device *dev, struct list_head *head)
801 {
802 struct macvlan_dev *vlan = netdev_priv(dev);
803
804 list_del(&vlan->list);
805 unregister_netdevice_queue(dev, head);
806 netdev_upper_dev_unlink(vlan->lowerdev, dev);
807 }
808 EXPORT_SYMBOL_GPL(macvlan_dellink);
809
810 static int macvlan_changelink(struct net_device *dev,
811 struct nlattr *tb[], struct nlattr *data[])
812 {
813 struct macvlan_dev *vlan = netdev_priv(dev);
814 if (data && data[IFLA_MACVLAN_MODE])
815 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
816 if (data && data[IFLA_MACVLAN_FLAGS]) {
817 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
818 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
819
820 if (promisc && (flags & MACVLAN_FLAG_NOPROMISC))
821 dev_set_promiscuity(vlan->lowerdev, -1);
822 else if (promisc && !(flags & MACVLAN_FLAG_NOPROMISC))
823 dev_set_promiscuity(vlan->lowerdev, 1);
824 vlan->flags = flags;
825 }
826 return 0;
827 }
828
829 static size_t macvlan_get_size(const struct net_device *dev)
830 {
831 return nla_total_size(4);
832 }
833
834 static int macvlan_fill_info(struct sk_buff *skb,
835 const struct net_device *dev)
836 {
837 struct macvlan_dev *vlan = netdev_priv(dev);
838
839 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
840 goto nla_put_failure;
841 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
842 goto nla_put_failure;
843 return 0;
844
845 nla_put_failure:
846 return -EMSGSIZE;
847 }
848
849 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
850 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
851 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
852 };
853
854 int macvlan_link_register(struct rtnl_link_ops *ops)
855 {
856 /* common fields */
857 ops->priv_size = sizeof(struct macvlan_dev);
858 ops->validate = macvlan_validate;
859 ops->maxtype = IFLA_MACVLAN_MAX;
860 ops->policy = macvlan_policy;
861 ops->changelink = macvlan_changelink;
862 ops->get_size = macvlan_get_size;
863 ops->fill_info = macvlan_fill_info;
864
865 return rtnl_link_register(ops);
866 };
867 EXPORT_SYMBOL_GPL(macvlan_link_register);
868
869 static struct rtnl_link_ops macvlan_link_ops = {
870 .kind = "macvlan",
871 .setup = macvlan_setup,
872 .newlink = macvlan_newlink,
873 .dellink = macvlan_dellink,
874 };
875
876 static int macvlan_device_event(struct notifier_block *unused,
877 unsigned long event, void *ptr)
878 {
879 struct net_device *dev = ptr;
880 struct macvlan_dev *vlan, *next;
881 struct macvlan_port *port;
882 LIST_HEAD(list_kill);
883
884 if (!macvlan_port_exists(dev))
885 return NOTIFY_DONE;
886
887 port = macvlan_port_get(dev);
888
889 switch (event) {
890 case NETDEV_CHANGE:
891 list_for_each_entry(vlan, &port->vlans, list)
892 netif_stacked_transfer_operstate(vlan->lowerdev,
893 vlan->dev);
894 break;
895 case NETDEV_FEAT_CHANGE:
896 list_for_each_entry(vlan, &port->vlans, list) {
897 vlan->dev->features = dev->features & MACVLAN_FEATURES;
898 vlan->dev->gso_max_size = dev->gso_max_size;
899 netdev_features_change(vlan->dev);
900 }
901 break;
902 case NETDEV_UNREGISTER:
903 /* twiddle thumbs on netns device moves */
904 if (dev->reg_state != NETREG_UNREGISTERING)
905 break;
906
907 list_for_each_entry_safe(vlan, next, &port->vlans, list)
908 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
909 unregister_netdevice_many(&list_kill);
910 list_del(&list_kill);
911 break;
912 case NETDEV_PRE_TYPE_CHANGE:
913 /* Forbid underlaying device to change its type. */
914 return NOTIFY_BAD;
915 }
916 return NOTIFY_DONE;
917 }
918
919 static struct notifier_block macvlan_notifier_block __read_mostly = {
920 .notifier_call = macvlan_device_event,
921 };
922
923 static int __init macvlan_init_module(void)
924 {
925 int err;
926
927 register_netdevice_notifier(&macvlan_notifier_block);
928
929 err = macvlan_link_register(&macvlan_link_ops);
930 if (err < 0)
931 goto err1;
932 return 0;
933 err1:
934 unregister_netdevice_notifier(&macvlan_notifier_block);
935 return err;
936 }
937
938 static void __exit macvlan_cleanup_module(void)
939 {
940 rtnl_link_unregister(&macvlan_link_ops);
941 unregister_netdevice_notifier(&macvlan_notifier_block);
942 }
943
944 module_init(macvlan_init_module);
945 module_exit(macvlan_cleanup_module);
946
947 MODULE_LICENSE("GPL");
948 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
949 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
950 MODULE_ALIAS_RTNL_LINK("macvlan");
kernel source for telekom puls (alcatel/mediatek)