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authorPatrick McHardy <kaber@trash.net>2007-07-14 21:55:06 -0400
committerDavid S. Miller <davem@davemloft.net>2007-07-14 21:55:06 -0400
commitb863ceb7ddcea8c55fcf1d7b2ac591d50aa7ed53 (patch)
treea65d5e4be77666600c0005c5f4c9091df63a3a1b /drivers/net
parent56addd6eeeb4e11f5a0af7093ca078e0f29140e0 (diff)
[NET]: Add macvlan driver
Add macvlan driver, which allows to create virtual ethernet devices based on MAC address. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/Kconfig10
-rw-r--r--drivers/net/Makefile1
-rw-r--r--drivers/net/macvlan.c496
3 files changed, 507 insertions, 0 deletions
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index ba314adf68b8..d17d64eb7065 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -82,6 +82,16 @@ config BONDING
82 To compile this driver as a module, choose M here: the module 82 To compile this driver as a module, choose M here: the module
83 will be called bonding. 83 will be called bonding.
84 84
85config MACVLAN
86 tristate "MAC-VLAN support (EXPERIMENTAL)"
87 depends on EXPERIMENTAL
88 ---help---
89 This allows one to create virtual interfaces that map packets to
90 or from specific MAC addresses to a particular interface.
91
92 To compile this driver as a module, choose M here: the module
93 will be called macvlan.
94
85config EQUALIZER 95config EQUALIZER
86 tristate "EQL (serial line load balancing) support" 96 tristate "EQL (serial line load balancing) support"
87 ---help--- 97 ---help---
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index a2241e6e1457..c26b8674213c 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -128,6 +128,7 @@ obj-$(CONFIG_SLHC) += slhc.o
128 128
129obj-$(CONFIG_DUMMY) += dummy.o 129obj-$(CONFIG_DUMMY) += dummy.o
130obj-$(CONFIG_IFB) += ifb.o 130obj-$(CONFIG_IFB) += ifb.o
131obj-$(CONFIG_MACVLAN) += macvlan.o
131obj-$(CONFIG_DE600) += de600.o 132obj-$(CONFIG_DE600) += de600.o
132obj-$(CONFIG_DE620) += de620.o 133obj-$(CONFIG_DE620) += de620.o
133obj-$(CONFIG_LANCE) += lance.o 134obj-$(CONFIG_LANCE) += lance.o
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
new file mode 100644
index 000000000000..dc74d006e01f
--- /dev/null
+++ b/drivers/net/macvlan.c
@@ -0,0 +1,496 @@
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/list.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_link.h>
30#include <linux/if_macvlan.h>
31#include <net/rtnetlink.h>
32
33#define MACVLAN_HASH_SIZE (1 << BITS_PER_BYTE)
34
35struct macvlan_port {
36 struct net_device *dev;
37 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
38 struct list_head vlans;
39};
40
41struct macvlan_dev {
42 struct net_device *dev;
43 struct list_head list;
44 struct hlist_node hlist;
45 struct macvlan_port *port;
46 struct net_device *lowerdev;
47};
48
49
50static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
51 const unsigned char *addr)
52{
53 struct macvlan_dev *vlan;
54 struct hlist_node *n;
55
56 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[addr[5]], hlist) {
57 if (!compare_ether_addr(vlan->dev->dev_addr, addr))
58 return vlan;
59 }
60 return NULL;
61}
62
63static void macvlan_broadcast(struct sk_buff *skb,
64 const struct macvlan_port *port)
65{
66 const struct ethhdr *eth = eth_hdr(skb);
67 const struct macvlan_dev *vlan;
68 struct hlist_node *n;
69 struct net_device *dev;
70 struct sk_buff *nskb;
71 unsigned int i;
72
73 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
74 hlist_for_each_entry_rcu(vlan, n, &port->vlan_hash[i], hlist) {
75 dev = vlan->dev;
76 if (unlikely(!(dev->flags & IFF_UP)))
77 continue;
78
79 nskb = skb_clone(skb, GFP_ATOMIC);
80 if (nskb == NULL) {
81 dev->stats.rx_errors++;
82 dev->stats.rx_dropped++;
83 continue;
84 }
85
86 dev->stats.rx_bytes += skb->len + ETH_HLEN;
87 dev->stats.rx_packets++;
88 dev->stats.multicast++;
89 dev->last_rx = jiffies;
90
91 nskb->dev = dev;
92 if (!compare_ether_addr(eth->h_dest, dev->broadcast))
93 nskb->pkt_type = PACKET_BROADCAST;
94 else
95 nskb->pkt_type = PACKET_MULTICAST;
96
97 netif_rx(nskb);
98 }
99 }
100}
101
102/* called under rcu_read_lock() from netif_receive_skb */
103static struct sk_buff *macvlan_handle_frame(struct sk_buff *skb)
104{
105 const struct ethhdr *eth = eth_hdr(skb);
106 const struct macvlan_port *port;
107 const struct macvlan_dev *vlan;
108 struct net_device *dev;
109
110 port = rcu_dereference(skb->dev->macvlan_port);
111 if (port == NULL)
112 return skb;
113
114 if (is_multicast_ether_addr(eth->h_dest)) {
115 macvlan_broadcast(skb, port);
116 return skb;
117 }
118
119 vlan = macvlan_hash_lookup(port, eth->h_dest);
120 if (vlan == NULL)
121 return skb;
122
123 dev = vlan->dev;
124 if (unlikely(!(dev->flags & IFF_UP))) {
125 kfree_skb(skb);
126 return NULL;
127 }
128
129 skb = skb_share_check(skb, GFP_ATOMIC);
130 if (skb == NULL) {
131 dev->stats.rx_errors++;
132 dev->stats.rx_dropped++;
133 return NULL;
134 }
135
136 dev->stats.rx_bytes += skb->len + ETH_HLEN;
137 dev->stats.rx_packets++;
138 dev->last_rx = jiffies;
139
140 skb->dev = dev;
141 skb->pkt_type = PACKET_HOST;
142
143 netif_rx(skb);
144 return NULL;
145}
146
147static int macvlan_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
148{
149 const struct macvlan_dev *vlan = netdev_priv(dev);
150 unsigned int len = skb->len;
151 int ret;
152
153 skb->dev = vlan->lowerdev;
154 ret = dev_queue_xmit(skb);
155
156 if (likely(ret == NET_XMIT_SUCCESS)) {
157 dev->stats.tx_packets++;
158 dev->stats.tx_bytes += len;
159 } else {
160 dev->stats.tx_errors++;
161 dev->stats.tx_aborted_errors++;
162 }
163 return NETDEV_TX_OK;
164}
165
166static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
167 unsigned short type, void *daddr, void *saddr,
168 unsigned len)
169{
170 const struct macvlan_dev *vlan = netdev_priv(dev);
171 struct net_device *lowerdev = vlan->lowerdev;
172
173 return lowerdev->hard_header(skb, lowerdev, type, daddr,
174 saddr ? : dev->dev_addr, len);
175}
176
177static int macvlan_open(struct net_device *dev)
178{
179 struct macvlan_dev *vlan = netdev_priv(dev);
180 struct macvlan_port *port = vlan->port;
181 struct net_device *lowerdev = vlan->lowerdev;
182 int err;
183
184 err = dev_unicast_add(lowerdev, dev->dev_addr, ETH_ALEN);
185 if (err < 0)
186 return err;
187 if (dev->flags & IFF_ALLMULTI)
188 dev_set_allmulti(lowerdev, 1);
189
190 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[dev->dev_addr[5]]);
191 return 0;
192}
193
194static int macvlan_stop(struct net_device *dev)
195{
196 struct macvlan_dev *vlan = netdev_priv(dev);
197 struct net_device *lowerdev = vlan->lowerdev;
198
199 dev_mc_unsync(lowerdev, dev);
200 if (dev->flags & IFF_ALLMULTI)
201 dev_set_allmulti(lowerdev, -1);
202
203 dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
204
205 hlist_del_rcu(&vlan->hlist);
206 synchronize_rcu();
207 return 0;
208}
209
210static void macvlan_change_rx_flags(struct net_device *dev, int change)
211{
212 struct macvlan_dev *vlan = netdev_priv(dev);
213 struct net_device *lowerdev = vlan->lowerdev;
214
215 if (change & IFF_ALLMULTI)
216 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
217}
218
219static void macvlan_set_multicast_list(struct net_device *dev)
220{
221 struct macvlan_dev *vlan = netdev_priv(dev);
222
223 dev_mc_sync(vlan->lowerdev, dev);
224}
225
226static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
227{
228 struct macvlan_dev *vlan = netdev_priv(dev);
229
230 if (new_mtu < 68 || vlan->lowerdev->mtu < new_mtu)
231 return -EINVAL;
232 dev->mtu = new_mtu;
233 return 0;
234}
235
236/*
237 * macvlan network devices have devices nesting below it and are a special
238 * "super class" of normal network devices; split their locks off into a
239 * separate class since they always nest.
240 */
241static struct lock_class_key macvlan_netdev_xmit_lock_key;
242
243#define MACVLAN_FEATURES \
244 (NETIF_F_SG | NETIF_F_ALL_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
245 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_UFO | NETIF_F_GSO_ROBUST | \
246 NETIF_F_TSO_ECN | NETIF_F_TSO6)
247
248#define MACVLAN_STATE_MASK \
249 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
250
251static int macvlan_init(struct net_device *dev)
252{
253 struct macvlan_dev *vlan = netdev_priv(dev);
254 const struct net_device *lowerdev = vlan->lowerdev;
255
256 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
257 (lowerdev->state & MACVLAN_STATE_MASK);
258 dev->features = lowerdev->features & MACVLAN_FEATURES;
259 dev->iflink = lowerdev->ifindex;
260
261 lockdep_set_class(&dev->_xmit_lock, &macvlan_netdev_xmit_lock_key);
262 return 0;
263}
264
265static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
266 struct ethtool_drvinfo *drvinfo)
267{
268 snprintf(drvinfo->driver, 32, "macvlan");
269 snprintf(drvinfo->version, 32, "0.1");
270}
271
272static u32 macvlan_ethtool_get_rx_csum(struct net_device *dev)
273{
274 const struct macvlan_dev *vlan = netdev_priv(dev);
275 struct net_device *lowerdev = vlan->lowerdev;
276
277 if (lowerdev->ethtool_ops->get_rx_csum == NULL)
278 return 0;
279 return lowerdev->ethtool_ops->get_rx_csum(lowerdev);
280}
281
282static const struct ethtool_ops macvlan_ethtool_ops = {
283 .get_link = ethtool_op_get_link,
284 .get_rx_csum = macvlan_ethtool_get_rx_csum,
285 .get_tx_csum = ethtool_op_get_tx_csum,
286 .get_tso = ethtool_op_get_tso,
287 .get_ufo = ethtool_op_get_ufo,
288 .get_sg = ethtool_op_get_sg,
289 .get_drvinfo = macvlan_ethtool_get_drvinfo,
290};
291
292static void macvlan_setup(struct net_device *dev)
293{
294 ether_setup(dev);
295
296 dev->init = macvlan_init;
297 dev->open = macvlan_open;
298 dev->stop = macvlan_stop;
299 dev->change_mtu = macvlan_change_mtu;
300 dev->change_rx_flags = macvlan_change_rx_flags;
301 dev->set_multicast_list = macvlan_set_multicast_list;
302 dev->hard_header = macvlan_hard_header;
303 dev->hard_start_xmit = macvlan_hard_start_xmit;
304 dev->destructor = free_netdev;
305 dev->ethtool_ops = &macvlan_ethtool_ops;
306 dev->tx_queue_len = 0;
307}
308
309static int macvlan_port_create(struct net_device *dev)
310{
311 struct macvlan_port *port;
312 unsigned int i;
313
314 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
315 return -EINVAL;
316
317 port = kzalloc(sizeof(*port), GFP_KERNEL);
318 if (port == NULL)
319 return -ENOMEM;
320
321 port->dev = dev;
322 INIT_LIST_HEAD(&port->vlans);
323 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
324 INIT_HLIST_HEAD(&port->vlan_hash[i]);
325 rcu_assign_pointer(dev->macvlan_port, port);
326 return 0;
327}
328
329static void macvlan_port_destroy(struct net_device *dev)
330{
331 struct macvlan_port *port = dev->macvlan_port;
332
333 rcu_assign_pointer(dev->macvlan_port, NULL);
334 synchronize_rcu();
335 kfree(port);
336}
337
338static void macvlan_transfer_operstate(struct net_device *dev)
339{
340 struct macvlan_dev *vlan = netdev_priv(dev);
341 const struct net_device *lowerdev = vlan->lowerdev;
342
343 if (lowerdev->operstate == IF_OPER_DORMANT)
344 netif_dormant_on(dev);
345 else
346 netif_dormant_off(dev);
347
348 if (netif_carrier_ok(lowerdev)) {
349 if (!netif_carrier_ok(dev))
350 netif_carrier_on(dev);
351 } else {
352 if (netif_carrier_ok(lowerdev))
353 netif_carrier_off(dev);
354 }
355}
356
357static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[])
358{
359 if (tb[IFLA_ADDRESS]) {
360 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
361 return -EINVAL;
362 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
363 return -EADDRNOTAVAIL;
364 }
365 return 0;
366}
367
368static int macvlan_newlink(struct net_device *dev,
369 struct nlattr *tb[], struct nlattr *data[])
370{
371 struct macvlan_dev *vlan = netdev_priv(dev);
372 struct macvlan_port *port;
373 struct net_device *lowerdev;
374 int err;
375
376 if (!tb[IFLA_LINK])
377 return -EINVAL;
378
379 lowerdev = __dev_get_by_index(nla_get_u32(tb[IFLA_LINK]));
380 if (lowerdev == NULL)
381 return -ENODEV;
382
383 if (!tb[IFLA_MTU])
384 dev->mtu = lowerdev->mtu;
385 else if (dev->mtu > lowerdev->mtu)
386 return -EINVAL;
387
388 if (!tb[IFLA_ADDRESS])
389 random_ether_addr(dev->dev_addr);
390
391 if (lowerdev->macvlan_port == NULL) {
392 err = macvlan_port_create(lowerdev);
393 if (err < 0)
394 return err;
395 }
396 port = lowerdev->macvlan_port;
397
398 vlan->lowerdev = lowerdev;
399 vlan->dev = dev;
400 vlan->port = port;
401
402 err = register_netdevice(dev);
403 if (err < 0)
404 return err;
405
406 list_add_tail(&vlan->list, &port->vlans);
407 macvlan_transfer_operstate(dev);
408 return 0;
409}
410
411static void macvlan_dellink(struct net_device *dev)
412{
413 struct macvlan_dev *vlan = netdev_priv(dev);
414 struct macvlan_port *port = vlan->port;
415
416 list_del(&vlan->list);
417 unregister_netdevice(dev);
418
419 if (list_empty(&port->vlans))
420 macvlan_port_destroy(dev);
421}
422
423static struct rtnl_link_ops macvlan_link_ops __read_mostly = {
424 .kind = "macvlan",
425 .priv_size = sizeof(struct macvlan_dev),
426 .setup = macvlan_setup,
427 .validate = macvlan_validate,
428 .newlink = macvlan_newlink,
429 .dellink = macvlan_dellink,
430};
431
432static int macvlan_device_event(struct notifier_block *unused,
433 unsigned long event, void *ptr)
434{
435 struct net_device *dev = ptr;
436 struct macvlan_dev *vlan, *next;
437 struct macvlan_port *port;
438
439 port = dev->macvlan_port;
440 if (port == NULL)
441 return NOTIFY_DONE;
442
443 switch (event) {
444 case NETDEV_CHANGE:
445 list_for_each_entry(vlan, &port->vlans, list)
446 macvlan_transfer_operstate(vlan->dev);
447 break;
448 case NETDEV_FEAT_CHANGE:
449 list_for_each_entry(vlan, &port->vlans, list) {
450 vlan->dev->features = dev->features & MACVLAN_FEATURES;
451 netdev_features_change(vlan->dev);
452 }
453 break;
454 case NETDEV_UNREGISTER:
455 list_for_each_entry_safe(vlan, next, &port->vlans, list)
456 macvlan_dellink(vlan->dev);
457 break;
458 }
459 return NOTIFY_DONE;
460}
461
462static struct notifier_block macvlan_notifier_block __read_mostly = {
463 .notifier_call = macvlan_device_event,
464};
465
466static int __init macvlan_init_module(void)
467{
468 int err;
469
470 register_netdevice_notifier(&macvlan_notifier_block);
471 macvlan_handle_frame_hook = macvlan_handle_frame;
472
473 err = rtnl_link_register(&macvlan_link_ops);
474 if (err < 0)
475 goto err1;
476 return 0;
477err1:
478 macvlan_handle_frame_hook = macvlan_handle_frame;
479 unregister_netdevice_notifier(&macvlan_notifier_block);
480 return err;
481}
482
483static void __exit macvlan_cleanup_module(void)
484{
485 rtnl_link_unregister(&macvlan_link_ops);
486 macvlan_handle_frame_hook = NULL;
487 unregister_netdevice_notifier(&macvlan_notifier_block);
488}
489
490module_init(macvlan_init_module);
491module_exit(macvlan_cleanup_module);
492
493MODULE_LICENSE("GPL");
494MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
495MODULE_DESCRIPTION("Driver for MAC address based VLANs");
496MODULE_ALIAS_RTNL_LINK("macvlan");