Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
cd1ae0e4 | 2 | * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
f28169d2 | 3 | * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and |
1da177e4 LT |
4 | * James Leu (jleu@mindspring.net). |
5 | * Copyright (C) 2001 by various other people who didn't put their name here. | |
6 | * Licensed under the GPL. | |
7 | */ | |
8 | ||
cd1ae0e4 JD |
9 | #include <linux/bootmem.h> |
10 | #include <linux/etherdevice.h> | |
11 | #include <linux/ethtool.h> | |
12 | #include <linux/inetdevice.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/list.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/rtnetlink.h> | |
18 | #include <linux/skbuff.h> | |
5a0e3ad6 | 19 | #include <linux/slab.h> |
cd1ae0e4 | 20 | #include <linux/spinlock.h> |
1da177e4 | 21 | #include "init.h" |
1da177e4 | 22 | #include "irq_kern.h" |
cd1ae0e4 JD |
23 | #include "irq_user.h" |
24 | #include "mconsole_kern.h" | |
25 | #include "net_kern.h" | |
26 | #include "net_user.h" | |
1da177e4 LT |
27 | |
28 | #define DRIVER_NAME "uml-netdev" | |
29 | ||
30 | static DEFINE_SPINLOCK(opened_lock); | |
9010772c | 31 | static LIST_HEAD(opened); |
1da177e4 | 32 | |
605c1e57 JD |
33 | /* |
34 | * The drop_skb is used when we can't allocate an skb. The | |
35 | * packet is read into drop_skb in order to get the data off the | |
36 | * connection to the host. | |
37 | * It is reallocated whenever a maximum packet size is seen which is | |
38 | * larger than any seen before. update_drop_skb is called from | |
39 | * eth_configure when a new interface is added. | |
40 | */ | |
41 | static DEFINE_SPINLOCK(drop_lock); | |
42 | static struct sk_buff *drop_skb; | |
43 | static int drop_max; | |
44 | ||
45 | static int update_drop_skb(int max) | |
46 | { | |
47 | struct sk_buff *new; | |
48 | unsigned long flags; | |
49 | int err = 0; | |
50 | ||
51 | spin_lock_irqsave(&drop_lock, flags); | |
52 | ||
53 | if (max <= drop_max) | |
54 | goto out; | |
55 | ||
56 | err = -ENOMEM; | |
57 | new = dev_alloc_skb(max); | |
58 | if (new == NULL) | |
59 | goto out; | |
60 | ||
61 | skb_put(new, max); | |
62 | ||
63 | kfree_skb(drop_skb); | |
64 | drop_skb = new; | |
65 | drop_max = max; | |
66 | err = 0; | |
67 | out: | |
68 | spin_unlock_irqrestore(&drop_lock, flags); | |
69 | ||
70 | return err; | |
71 | } | |
72 | ||
1da177e4 LT |
73 | static int uml_net_rx(struct net_device *dev) |
74 | { | |
17c324fa | 75 | struct uml_net_private *lp = netdev_priv(dev); |
1da177e4 LT |
76 | int pkt_len; |
77 | struct sk_buff *skb; | |
78 | ||
79 | /* If we can't allocate memory, try again next round. */ | |
b53f35a8 | 80 | skb = dev_alloc_skb(lp->max_packet); |
1da177e4 | 81 | if (skb == NULL) { |
605c1e57 JD |
82 | drop_skb->dev = dev; |
83 | /* Read a packet into drop_skb and don't do anything with it. */ | |
84 | (*lp->read)(lp->fd, drop_skb, lp); | |
cfa8707a | 85 | dev->stats.rx_dropped++; |
1da177e4 LT |
86 | return 0; |
87 | } | |
88 | ||
89 | skb->dev = dev; | |
b53f35a8 | 90 | skb_put(skb, lp->max_packet); |
459a98ed | 91 | skb_reset_mac_header(skb); |
b53f35a8 | 92 | pkt_len = (*lp->read)(lp->fd, skb, lp); |
1da177e4 LT |
93 | |
94 | if (pkt_len > 0) { | |
95 | skb_trim(skb, pkt_len); | |
96 | skb->protocol = (*lp->protocol)(skb); | |
1da177e4 | 97 | |
cfa8707a SH |
98 | dev->stats.rx_bytes += skb->len; |
99 | dev->stats.rx_packets++; | |
505a41d4 | 100 | netif_rx(skb); |
1da177e4 LT |
101 | return pkt_len; |
102 | } | |
103 | ||
104 | kfree_skb(skb); | |
105 | return pkt_len; | |
106 | } | |
107 | ||
eff3b634 | 108 | static void uml_dev_close(struct work_struct *work) |
71c8d4c3 | 109 | { |
eff3b634 PZ |
110 | struct uml_net_private *lp = |
111 | container_of(work, struct uml_net_private, work); | |
112 | dev_close(lp->dev); | |
71c8d4c3 PBG |
113 | } |
114 | ||
074a0db8 | 115 | static irqreturn_t uml_net_interrupt(int irq, void *dev_id) |
1da177e4 LT |
116 | { |
117 | struct net_device *dev = dev_id; | |
17c324fa | 118 | struct uml_net_private *lp = netdev_priv(dev); |
1da177e4 LT |
119 | int err; |
120 | ||
cd1ae0e4 JD |
121 | if (!netif_running(dev)) |
122 | return IRQ_NONE; | |
1da177e4 LT |
123 | |
124 | spin_lock(&lp->lock); | |
cd1ae0e4 JD |
125 | while ((err = uml_net_rx(dev)) > 0) ; |
126 | if (err < 0) { | |
f28169d2 JD |
127 | printk(KERN_ERR |
128 | "Device '%s' read returned %d, shutting it down\n", | |
1da177e4 | 129 | dev->name, err); |
71c8d4c3 PBG |
130 | /* dev_close can't be called in interrupt context, and takes |
131 | * again lp->lock. | |
132 | * And dev_close() can be safely called multiple times on the | |
133 | * same device, since it tests for (dev->flags & IFF_UP). So | |
eff3b634 PZ |
134 | * there's no harm in delaying the device shutdown. |
135 | * Furthermore, the workqueue will not re-enqueue an already | |
136 | * enqueued work item. */ | |
137 | schedule_work(&lp->work); | |
1da177e4 LT |
138 | goto out; |
139 | } | |
140 | reactivate_fd(lp->fd, UM_ETH_IRQ); | |
141 | ||
71c8d4c3 | 142 | out: |
1da177e4 | 143 | spin_unlock(&lp->lock); |
4ea21cd9 | 144 | return IRQ_HANDLED; |
1da177e4 LT |
145 | } |
146 | ||
147 | static int uml_net_open(struct net_device *dev) | |
148 | { | |
17c324fa | 149 | struct uml_net_private *lp = netdev_priv(dev); |
1da177e4 LT |
150 | int err; |
151 | ||
cd1ae0e4 | 152 | if (lp->fd >= 0) { |
1da177e4 LT |
153 | err = -ENXIO; |
154 | goto out; | |
155 | } | |
156 | ||
1da177e4 | 157 | lp->fd = (*lp->open)(&lp->user); |
cd1ae0e4 | 158 | if (lp->fd < 0) { |
1da177e4 LT |
159 | err = lp->fd; |
160 | goto out; | |
161 | } | |
162 | ||
163 | err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt, | |
c0b79a90 | 164 | IRQF_SHARED, dev->name, dev); |
cd1ae0e4 | 165 | if (err != 0) { |
1da177e4 | 166 | printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err); |
1da177e4 | 167 | err = -ENETUNREACH; |
14d9ead0 | 168 | goto out_close; |
1da177e4 LT |
169 | } |
170 | ||
171 | lp->tl.data = (unsigned long) &lp->user; | |
172 | netif_start_queue(dev); | |
173 | ||
174 | /* clear buffer - it can happen that the host side of the interface | |
175 | * is full when we get here. In this case, new data is never queued, | |
176 | * SIGIOs never arrive, and the net never works. | |
177 | */ | |
cd1ae0e4 | 178 | while ((err = uml_net_rx(dev)) > 0) ; |
1da177e4 | 179 | |
14d9ead0 JD |
180 | spin_lock(&opened_lock); |
181 | list_add(&lp->list, &opened); | |
182 | spin_unlock(&opened_lock); | |
183 | ||
184 | return 0; | |
185 | out_close: | |
cd1ae0e4 | 186 | if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user); |
14d9ead0 JD |
187 | lp->fd = -1; |
188 | out: | |
14d9ead0 | 189 | return err; |
1da177e4 LT |
190 | } |
191 | ||
192 | static int uml_net_close(struct net_device *dev) | |
193 | { | |
17c324fa | 194 | struct uml_net_private *lp = netdev_priv(dev); |
f28169d2 | 195 | |
1da177e4 | 196 | netif_stop_queue(dev); |
1da177e4 | 197 | |
fa7a0449 | 198 | um_free_irq(dev->irq, dev); |
cd1ae0e4 | 199 | if (lp->close != NULL) |
1da177e4 LT |
200 | (*lp->close)(lp->fd, &lp->user); |
201 | lp->fd = -1; | |
202 | ||
14d9ead0 JD |
203 | spin_lock(&opened_lock); |
204 | list_del(&lp->list); | |
205 | spin_unlock(&opened_lock); | |
206 | ||
1da177e4 LT |
207 | return 0; |
208 | } | |
209 | ||
210 | static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
211 | { | |
17c324fa | 212 | struct uml_net_private *lp = netdev_priv(dev); |
1da177e4 LT |
213 | unsigned long flags; |
214 | int len; | |
215 | ||
216 | netif_stop_queue(dev); | |
217 | ||
218 | spin_lock_irqsave(&lp->lock, flags); | |
219 | ||
b53f35a8 | 220 | len = (*lp->write)(lp->fd, skb, lp); |
1da177e4 | 221 | |
cd1ae0e4 | 222 | if (len == skb->len) { |
cfa8707a SH |
223 | dev->stats.tx_packets++; |
224 | dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
225 | dev->trans_start = jiffies; |
226 | netif_start_queue(dev); | |
227 | ||
228 | /* this is normally done in the interrupt when tx finishes */ | |
229 | netif_wake_queue(dev); | |
f28169d2 | 230 | } |
cd1ae0e4 | 231 | else if (len == 0) { |
1da177e4 | 232 | netif_start_queue(dev); |
cfa8707a | 233 | dev->stats.tx_dropped++; |
1da177e4 LT |
234 | } |
235 | else { | |
236 | netif_start_queue(dev); | |
237 | printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len); | |
238 | } | |
239 | ||
240 | spin_unlock_irqrestore(&lp->lock, flags); | |
241 | ||
242 | dev_kfree_skb(skb); | |
243 | ||
6ed10654 | 244 | return NETDEV_TX_OK; |
1da177e4 LT |
245 | } |
246 | ||
1da177e4 LT |
247 | static void uml_net_set_multicast_list(struct net_device *dev) |
248 | { | |
f70c1766 | 249 | return; |
1da177e4 LT |
250 | } |
251 | ||
252 | static void uml_net_tx_timeout(struct net_device *dev) | |
253 | { | |
254 | dev->trans_start = jiffies; | |
255 | netif_wake_queue(dev); | |
256 | } | |
257 | ||
1da177e4 LT |
258 | static int uml_net_change_mtu(struct net_device *dev, int new_mtu) |
259 | { | |
1da177e4 LT |
260 | dev->mtu = new_mtu; |
261 | ||
b53f35a8 | 262 | return 0; |
1da177e4 LT |
263 | } |
264 | ||
dd71dc4c RW |
265 | #ifdef CONFIG_NET_POLL_CONTROLLER |
266 | static void uml_net_poll_controller(struct net_device *dev) | |
267 | { | |
268 | disable_irq(dev->irq); | |
269 | uml_net_interrupt(dev->irq, dev); | |
270 | enable_irq(dev->irq); | |
271 | } | |
272 | #endif | |
273 | ||
6d387484 CH |
274 | static void uml_net_get_drvinfo(struct net_device *dev, |
275 | struct ethtool_drvinfo *info) | |
1da177e4 | 276 | { |
6d387484 CH |
277 | strcpy(info->driver, DRIVER_NAME); |
278 | strcpy(info->version, "42"); | |
1da177e4 LT |
279 | } |
280 | ||
0fc0b732 | 281 | static const struct ethtool_ops uml_net_ethtool_ops = { |
6d387484 CH |
282 | .get_drvinfo = uml_net_get_drvinfo, |
283 | .get_link = ethtool_op_get_link, | |
284 | }; | |
285 | ||
074a0db8 | 286 | static void uml_net_user_timer_expire(unsigned long _conn) |
1da177e4 LT |
287 | { |
288 | #ifdef undef | |
289 | struct connection *conn = (struct connection *)_conn; | |
290 | ||
291 | dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn); | |
292 | do_connect(conn); | |
293 | #endif | |
294 | } | |
295 | ||
95f2054f | 296 | static int setup_etheraddr(char *str, unsigned char *addr, char *name) |
b10aeeef JD |
297 | { |
298 | char *end; | |
299 | int i; | |
300 | ||
cd1ae0e4 | 301 | if (str == NULL) |
b10aeeef JD |
302 | goto random; |
303 | ||
2278c5ac | 304 | for (i = 0; i < 6; i++) { |
b10aeeef | 305 | addr[i] = simple_strtoul(str, &end, 16); |
cd1ae0e4 JD |
306 | if ((end == str) || |
307 | ((*end != ':') && (*end != ',') && (*end != '\0'))) { | |
b10aeeef JD |
308 | printk(KERN_ERR |
309 | "setup_etheraddr: failed to parse '%s' " | |
310 | "as an ethernet address\n", str); | |
311 | goto random; | |
312 | } | |
313 | str = end + 1; | |
314 | } | |
e024715f | 315 | if (is_multicast_ether_addr(addr)) { |
b10aeeef | 316 | printk(KERN_ERR |
e024715f | 317 | "Attempt to assign a multicast ethernet address to a " |
b10aeeef JD |
318 | "device disallowed\n"); |
319 | goto random; | |
320 | } | |
e024715f PBG |
321 | if (!is_valid_ether_addr(addr)) { |
322 | printk(KERN_ERR | |
323 | "Attempt to assign an invalid ethernet address to a " | |
324 | "device disallowed\n"); | |
325 | goto random; | |
326 | } | |
327 | if (!is_local_ether_addr(addr)) { | |
328 | printk(KERN_WARNING | |
2278c5ac | 329 | "Warning: Assigning a globally valid ethernet " |
7d98230a | 330 | "address to a device\n"); |
2278c5ac JD |
331 | printk(KERN_WARNING "You should set the 2nd rightmost bit in " |
332 | "the first byte of the MAC,\n"); | |
7d98230a JD |
333 | printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n", |
334 | addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4], | |
335 | addr[5]); | |
e024715f | 336 | } |
95f2054f | 337 | return 0; |
b10aeeef JD |
338 | |
339 | random: | |
e024715f PBG |
340 | printk(KERN_INFO |
341 | "Choosing a random ethernet address for device %s\n", name); | |
6e5928f6 | 342 | eth_random_addr(addr); |
95f2054f | 343 | return 1; |
b10aeeef JD |
344 | } |
345 | ||
1da177e4 | 346 | static DEFINE_SPINLOCK(devices_lock); |
9010772c | 347 | static LIST_HEAD(devices); |
1da177e4 | 348 | |
3ae5eaec RK |
349 | static struct platform_driver uml_net_driver = { |
350 | .driver = { | |
351 | .name = DRIVER_NAME, | |
352 | }, | |
1da177e4 | 353 | }; |
1da177e4 | 354 | |
2e3f5251 JD |
355 | static void net_device_release(struct device *dev) |
356 | { | |
8691b97b | 357 | struct uml_net *device = dev_get_drvdata(dev); |
2e3f5251 | 358 | struct net_device *netdev = device->dev; |
17c324fa | 359 | struct uml_net_private *lp = netdev_priv(netdev); |
2e3f5251 | 360 | |
cd1ae0e4 | 361 | if (lp->remove != NULL) |
2e3f5251 JD |
362 | (*lp->remove)(&lp->user); |
363 | list_del(&device->list); | |
364 | kfree(device); | |
365 | free_netdev(netdev); | |
366 | } | |
367 | ||
8bb95b39 SH |
368 | static const struct net_device_ops uml_netdev_ops = { |
369 | .ndo_open = uml_net_open, | |
370 | .ndo_stop = uml_net_close, | |
371 | .ndo_start_xmit = uml_net_start_xmit, | |
afc4b13d | 372 | .ndo_set_rx_mode = uml_net_set_multicast_list, |
8bb95b39 | 373 | .ndo_tx_timeout = uml_net_tx_timeout, |
9337057d | 374 | .ndo_set_mac_address = eth_mac_addr, |
8bb95b39 | 375 | .ndo_change_mtu = uml_net_change_mtu, |
8bb95b39 | 376 | .ndo_validate_addr = eth_validate_addr, |
dd71dc4c RW |
377 | #ifdef CONFIG_NET_POLL_CONTROLLER |
378 | .ndo_poll_controller = uml_net_poll_controller, | |
379 | #endif | |
8bb95b39 SH |
380 | }; |
381 | ||
80e39311 JD |
382 | /* |
383 | * Ensures that platform_driver_register is called only once by | |
384 | * eth_configure. Will be set in an initcall. | |
385 | */ | |
386 | static int driver_registered; | |
387 | ||
f34d9d2d JD |
388 | static void eth_configure(int n, void *init, char *mac, |
389 | struct transport *transport) | |
1da177e4 LT |
390 | { |
391 | struct uml_net *device; | |
392 | struct net_device *dev; | |
393 | struct uml_net_private *lp; | |
c74c69b4 | 394 | int err, size; |
95f2054f | 395 | int random_mac; |
1da177e4 | 396 | |
c74c69b4 | 397 | size = transport->private_size + sizeof(struct uml_net_private); |
1da177e4 | 398 | |
0268bd0a | 399 | device = kzalloc(sizeof(*device), GFP_KERNEL); |
1da177e4 | 400 | if (device == NULL) { |
8c840835 PBG |
401 | printk(KERN_ERR "eth_configure failed to allocate struct " |
402 | "uml_net\n"); | |
f34d9d2d | 403 | return; |
1da177e4 LT |
404 | } |
405 | ||
8c840835 PBG |
406 | dev = alloc_etherdev(size); |
407 | if (dev == NULL) { | |
408 | printk(KERN_ERR "eth_configure: failed to allocate struct " | |
409 | "net_device for eth%d\n", n); | |
410 | goto out_free_device; | |
411 | } | |
412 | ||
1da177e4 LT |
413 | INIT_LIST_HEAD(&device->list); |
414 | device->index = n; | |
415 | ||
e024715f PBG |
416 | /* If this name ends up conflicting with an existing registered |
417 | * netdevice, that is OK, register_netdev{,ice}() will notice this | |
418 | * and fail. | |
419 | */ | |
8c840835 | 420 | snprintf(dev->name, sizeof(dev->name), "eth%d", n); |
e024715f | 421 | |
95f2054f | 422 | random_mac = setup_etheraddr(mac, device->mac, dev->name); |
1da177e4 | 423 | |
7c510e4b | 424 | printk(KERN_INFO "Netdevice %d (%pM) : ", n, device->mac); |
1da177e4 | 425 | |
17c324fa | 426 | lp = netdev_priv(dev); |
e56a7885 PBG |
427 | /* This points to the transport private data. It's still clear, but we |
428 | * must memset it to 0 *now*. Let's help the drivers. */ | |
429 | memset(lp, 0, size); | |
eff3b634 | 430 | INIT_WORK(&lp->work, uml_dev_close); |
e56a7885 | 431 | |
1da177e4 LT |
432 | /* sysfs register */ |
433 | if (!driver_registered) { | |
3ae5eaec | 434 | platform_driver_register(¨_net_driver); |
1da177e4 LT |
435 | driver_registered = 1; |
436 | } | |
437 | device->pdev.id = n; | |
438 | device->pdev.name = DRIVER_NAME; | |
2e3f5251 | 439 | device->pdev.dev.release = net_device_release; |
8691b97b | 440 | dev_set_drvdata(&device->pdev.dev, device); |
cd1ae0e4 | 441 | if (platform_device_register(&device->pdev)) |
f34d9d2d | 442 | goto out_free_netdev; |
1da177e4 LT |
443 | SET_NETDEV_DEV(dev,&device->pdev.dev); |
444 | ||
1da177e4 LT |
445 | device->dev = dev; |
446 | ||
f34d9d2d JD |
447 | /* |
448 | * These just fill in a data structure, so there's no failure | |
449 | * to be worried about. | |
450 | */ | |
1da177e4 LT |
451 | (*transport->kern->init)(dev, init); |
452 | ||
1da177e4 LT |
453 | *lp = ((struct uml_net_private) |
454 | { .list = LIST_HEAD_INIT(lp->list), | |
455 | .dev = dev, | |
456 | .fd = -1, | |
457 | .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0}, | |
b53f35a8 | 458 | .max_packet = transport->user->max_packet, |
1da177e4 LT |
459 | .protocol = transport->kern->protocol, |
460 | .open = transport->user->open, | |
461 | .close = transport->user->close, | |
462 | .remove = transport->user->remove, | |
463 | .read = transport->kern->read, | |
464 | .write = transport->kern->write, | |
465 | .add_address = transport->user->add_address, | |
b53f35a8 | 466 | .delete_address = transport->user->delete_address }); |
1da177e4 LT |
467 | |
468 | init_timer(&lp->tl); | |
469 | spin_lock_init(&lp->lock); | |
470 | lp->tl.function = uml_net_user_timer_expire; | |
b10aeeef | 471 | memcpy(lp->mac, device->mac, sizeof(lp->mac)); |
1da177e4 | 472 | |
f34d9d2d JD |
473 | if ((transport->user->init != NULL) && |
474 | ((*transport->user->init)(&lp->user, dev) != 0)) | |
475 | goto out_unregister; | |
1da177e4 | 476 | |
9337057d BH |
477 | /* don't use eth_mac_addr, it will not work here */ |
478 | memcpy(dev->dev_addr, device->mac, ETH_ALEN); | |
95f2054f DK |
479 | if (random_mac) |
480 | dev->addr_assign_type |= NET_ADDR_RANDOM; | |
481 | ||
b53f35a8 | 482 | dev->mtu = transport->user->mtu; |
8bb95b39 | 483 | dev->netdev_ops = ¨_netdev_ops; |
f34d9d2d JD |
484 | dev->ethtool_ops = ¨_net_ethtool_ops; |
485 | dev->watchdog_timeo = (HZ >> 1); | |
486 | dev->irq = UM_ETH_IRQ; | |
1da177e4 | 487 | |
605c1e57 JD |
488 | err = update_drop_skb(lp->max_packet); |
489 | if (err) | |
490 | goto out_undo_user_init; | |
491 | ||
f34d9d2d JD |
492 | rtnl_lock(); |
493 | err = register_netdevice(dev); | |
494 | rtnl_unlock(); | |
495 | if (err) | |
496 | goto out_undo_user_init; | |
497 | ||
498 | spin_lock(&devices_lock); | |
499 | list_add(&device->list, &devices); | |
500 | spin_unlock(&devices_lock); | |
501 | ||
502 | return; | |
503 | ||
504 | out_undo_user_init: | |
8c840835 | 505 | if (transport->user->remove != NULL) |
f34d9d2d JD |
506 | (*transport->user->remove)(&lp->user); |
507 | out_unregister: | |
508 | platform_device_unregister(&device->pdev); | |
7d98230a | 509 | return; /* platform_device_unregister frees dev and device */ |
f34d9d2d JD |
510 | out_free_netdev: |
511 | free_netdev(dev); | |
8c840835 | 512 | out_free_device: |
f34d9d2d | 513 | kfree(device); |
1da177e4 LT |
514 | } |
515 | ||
516 | static struct uml_net *find_device(int n) | |
517 | { | |
518 | struct uml_net *device; | |
519 | struct list_head *ele; | |
520 | ||
521 | spin_lock(&devices_lock); | |
cd1ae0e4 | 522 | list_for_each(ele, &devices) { |
1da177e4 | 523 | device = list_entry(ele, struct uml_net, list); |
cd1ae0e4 | 524 | if (device->index == n) |
1da177e4 LT |
525 | goto out; |
526 | } | |
527 | device = NULL; | |
528 | out: | |
529 | spin_unlock(&devices_lock); | |
4ea21cd9 | 530 | return device; |
1da177e4 LT |
531 | } |
532 | ||
f28169d2 JD |
533 | static int eth_parse(char *str, int *index_out, char **str_out, |
534 | char **error_out) | |
1da177e4 LT |
535 | { |
536 | char *end; | |
a419aef8 | 537 | int n, err = -EINVAL; |
1da177e4 LT |
538 | |
539 | n = simple_strtoul(str, &end, 0); | |
cd1ae0e4 | 540 | if (end == str) { |
f28169d2 JD |
541 | *error_out = "Bad device number"; |
542 | return err; | |
1da177e4 | 543 | } |
f28169d2 | 544 | |
1da177e4 | 545 | str = end; |
cd1ae0e4 | 546 | if (*str != '=') { |
f28169d2 JD |
547 | *error_out = "Expected '=' after device number"; |
548 | return err; | |
1da177e4 | 549 | } |
f28169d2 | 550 | |
1da177e4 | 551 | str++; |
cd1ae0e4 | 552 | if (find_device(n)) { |
f28169d2 JD |
553 | *error_out = "Device already configured"; |
554 | return err; | |
1da177e4 | 555 | } |
f28169d2 JD |
556 | |
557 | *index_out = n; | |
1da177e4 | 558 | *str_out = str; |
f28169d2 | 559 | return 0; |
1da177e4 LT |
560 | } |
561 | ||
562 | struct eth_init { | |
563 | struct list_head list; | |
564 | char *init; | |
565 | int index; | |
566 | }; | |
567 | ||
d3b7f69d JD |
568 | static DEFINE_SPINLOCK(transports_lock); |
569 | static LIST_HEAD(transports); | |
1da177e4 LT |
570 | |
571 | /* Filled in during early boot */ | |
c862fc32 | 572 | static LIST_HEAD(eth_cmd_line); |
1da177e4 LT |
573 | |
574 | static int check_transport(struct transport *transport, char *eth, int n, | |
575 | void **init_out, char **mac_out) | |
576 | { | |
577 | int len; | |
578 | ||
579 | len = strlen(transport->name); | |
cd1ae0e4 | 580 | if (strncmp(eth, transport->name, len)) |
4ea21cd9 | 581 | return 0; |
1da177e4 LT |
582 | |
583 | eth += len; | |
cd1ae0e4 | 584 | if (*eth == ',') |
1da177e4 | 585 | eth++; |
cd1ae0e4 | 586 | else if (*eth != '\0') |
4ea21cd9 | 587 | return 0; |
1da177e4 LT |
588 | |
589 | *init_out = kmalloc(transport->setup_size, GFP_KERNEL); | |
cd1ae0e4 | 590 | if (*init_out == NULL) |
4ea21cd9 | 591 | return 1; |
1da177e4 | 592 | |
cd1ae0e4 | 593 | if (!transport->setup(eth, mac_out, *init_out)) { |
1da177e4 LT |
594 | kfree(*init_out); |
595 | *init_out = NULL; | |
596 | } | |
4ea21cd9 | 597 | return 1; |
1da177e4 LT |
598 | } |
599 | ||
600 | void register_transport(struct transport *new) | |
601 | { | |
602 | struct list_head *ele, *next; | |
603 | struct eth_init *eth; | |
604 | void *init; | |
605 | char *mac = NULL; | |
606 | int match; | |
607 | ||
d3b7f69d JD |
608 | spin_lock(&transports_lock); |
609 | BUG_ON(!list_empty(&new->list)); | |
1da177e4 | 610 | list_add(&new->list, &transports); |
d3b7f69d | 611 | spin_unlock(&transports_lock); |
1da177e4 | 612 | |
cd1ae0e4 | 613 | list_for_each_safe(ele, next, ð_cmd_line) { |
1da177e4 LT |
614 | eth = list_entry(ele, struct eth_init, list); |
615 | match = check_transport(new, eth->init, eth->index, &init, | |
616 | &mac); | |
cd1ae0e4 | 617 | if (!match) |
1da177e4 | 618 | continue; |
cd1ae0e4 | 619 | else if (init != NULL) { |
1da177e4 LT |
620 | eth_configure(eth->index, init, mac, new); |
621 | kfree(init); | |
622 | } | |
623 | list_del(ð->list); | |
624 | } | |
625 | } | |
626 | ||
627 | static int eth_setup_common(char *str, int index) | |
628 | { | |
629 | struct list_head *ele; | |
630 | struct transport *transport; | |
631 | void *init; | |
632 | char *mac = NULL; | |
c862fc32 | 633 | int found = 0; |
1da177e4 | 634 | |
c862fc32 | 635 | spin_lock(&transports_lock); |
cd1ae0e4 | 636 | list_for_each(ele, &transports) { |
1da177e4 | 637 | transport = list_entry(ele, struct transport, list); |
cd1ae0e4 | 638 | if (!check_transport(transport, str, index, &init, &mac)) |
1da177e4 | 639 | continue; |
cd1ae0e4 | 640 | if (init != NULL) { |
1da177e4 LT |
641 | eth_configure(index, init, mac, transport); |
642 | kfree(init); | |
643 | } | |
c862fc32 JD |
644 | found = 1; |
645 | break; | |
1da177e4 | 646 | } |
c862fc32 JD |
647 | |
648 | spin_unlock(&transports_lock); | |
649 | return found; | |
1da177e4 LT |
650 | } |
651 | ||
97a1fcbb | 652 | static int __init eth_setup(char *str) |
1da177e4 LT |
653 | { |
654 | struct eth_init *new; | |
f28169d2 | 655 | char *error; |
1da177e4 LT |
656 | int n, err; |
657 | ||
f28169d2 | 658 | err = eth_parse(str, &n, &str, &error); |
cd1ae0e4 | 659 | if (err) { |
f28169d2 JD |
660 | printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n", |
661 | str, error); | |
1183dc94 | 662 | return 1; |
f28169d2 | 663 | } |
1da177e4 | 664 | |
1183dc94 | 665 | new = alloc_bootmem(sizeof(*new)); |
cd1ae0e4 JD |
666 | if (new == NULL) { |
667 | printk(KERN_ERR "eth_init : alloc_bootmem failed\n"); | |
1183dc94 | 668 | return 1; |
1da177e4 LT |
669 | } |
670 | ||
671 | INIT_LIST_HEAD(&new->list); | |
672 | new->index = n; | |
673 | new->init = str; | |
674 | ||
675 | list_add_tail(&new->list, ð_cmd_line); | |
1183dc94 | 676 | return 1; |
1da177e4 LT |
677 | } |
678 | ||
679 | __setup("eth", eth_setup); | |
680 | __uml_help(eth_setup, | |
681 | "eth[0-9]+=<transport>,<options>\n" | |
682 | " Configure a network device.\n\n" | |
683 | ); | |
684 | ||
f28169d2 | 685 | static int net_config(char *str, char **error_out) |
1da177e4 LT |
686 | { |
687 | int n, err; | |
688 | ||
f28169d2 | 689 | err = eth_parse(str, &n, &str, error_out); |
cd1ae0e4 | 690 | if (err) |
f28169d2 | 691 | return err; |
1da177e4 | 692 | |
f28169d2 JD |
693 | /* This string is broken up and the pieces used by the underlying |
694 | * driver. So, it is freed only if eth_setup_common fails. | |
695 | */ | |
970d6e3a | 696 | str = kstrdup(str, GFP_KERNEL); |
cd1ae0e4 | 697 | if (str == NULL) { |
f28169d2 JD |
698 | *error_out = "net_config failed to strdup string"; |
699 | return -ENOMEM; | |
1da177e4 LT |
700 | } |
701 | err = !eth_setup_common(str, n); | |
cd1ae0e4 | 702 | if (err) |
1da177e4 | 703 | kfree(str); |
cd1ae0e4 | 704 | return err; |
1da177e4 LT |
705 | } |
706 | ||
29d56cfe JD |
707 | static int net_id(char **str, int *start_out, int *end_out) |
708 | { | |
cd1ae0e4 JD |
709 | char *end; |
710 | int n; | |
29d56cfe JD |
711 | |
712 | n = simple_strtoul(*str, &end, 0); | |
cd1ae0e4 | 713 | if ((*end != '\0') || (end == *str)) |
29d56cfe JD |
714 | return -1; |
715 | ||
cd1ae0e4 JD |
716 | *start_out = n; |
717 | *end_out = n; | |
718 | *str = end; | |
719 | return n; | |
29d56cfe JD |
720 | } |
721 | ||
f28169d2 | 722 | static int net_remove(int n, char **error_out) |
1da177e4 LT |
723 | { |
724 | struct uml_net *device; | |
725 | struct net_device *dev; | |
726 | struct uml_net_private *lp; | |
1da177e4 LT |
727 | |
728 | device = find_device(n); | |
cd1ae0e4 | 729 | if (device == NULL) |
29d56cfe | 730 | return -ENODEV; |
1da177e4 LT |
731 | |
732 | dev = device->dev; | |
17c324fa | 733 | lp = netdev_priv(dev); |
cd1ae0e4 | 734 | if (lp->fd > 0) |
4ea21cd9 | 735 | return -EBUSY; |
1da177e4 LT |
736 | unregister_netdev(dev); |
737 | platform_device_unregister(&device->pdev); | |
738 | ||
29d56cfe | 739 | return 0; |
1da177e4 LT |
740 | } |
741 | ||
742 | static struct mc_device net_mc = { | |
84f48d4f | 743 | .list = LIST_HEAD_INIT(net_mc.list), |
1da177e4 LT |
744 | .name = "eth", |
745 | .config = net_config, | |
746 | .get_config = NULL, | |
4ea21cd9 | 747 | .id = net_id, |
1da177e4 LT |
748 | .remove = net_remove, |
749 | }; | |
750 | ||
32f862c3 | 751 | #ifdef CONFIG_INET |
1da177e4 LT |
752 | static int uml_inetaddr_event(struct notifier_block *this, unsigned long event, |
753 | void *ptr) | |
754 | { | |
755 | struct in_ifaddr *ifa = ptr; | |
1da177e4 LT |
756 | struct net_device *dev = ifa->ifa_dev->dev; |
757 | struct uml_net_private *lp; | |
758 | void (*proc)(unsigned char *, unsigned char *, void *); | |
759 | unsigned char addr_buf[4], netmask_buf[4]; | |
760 | ||
ebe28bb4 | 761 | if (dev->netdev_ops->ndo_open != uml_net_open) |
4ea21cd9 | 762 | return NOTIFY_DONE; |
1da177e4 | 763 | |
17c324fa | 764 | lp = netdev_priv(dev); |
1da177e4 LT |
765 | |
766 | proc = NULL; | |
cd1ae0e4 | 767 | switch (event) { |
1da177e4 LT |
768 | case NETDEV_UP: |
769 | proc = lp->add_address; | |
770 | break; | |
771 | case NETDEV_DOWN: | |
772 | proc = lp->delete_address; | |
773 | break; | |
774 | } | |
cd1ae0e4 | 775 | if (proc != NULL) { |
0e76422c BS |
776 | memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf)); |
777 | memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf)); | |
1da177e4 LT |
778 | (*proc)(addr_buf, netmask_buf, &lp->user); |
779 | } | |
4ea21cd9 | 780 | return NOTIFY_DONE; |
1da177e4 LT |
781 | } |
782 | ||
c862fc32 | 783 | /* uml_net_init shouldn't be called twice on two CPUs at the same time */ |
074a0db8 | 784 | static struct notifier_block uml_inetaddr_notifier = { |
1da177e4 LT |
785 | .notifier_call = uml_inetaddr_event, |
786 | }; | |
787 | ||
32f862c3 | 788 | static void inet_register(void) |
1da177e4 LT |
789 | { |
790 | struct list_head *ele; | |
f28169d2 | 791 | struct uml_net_private *lp; |
1da177e4 LT |
792 | struct in_device *ip; |
793 | struct in_ifaddr *in; | |
794 | ||
1da177e4 LT |
795 | register_inetaddr_notifier(¨_inetaddr_notifier); |
796 | ||
797 | /* Devices may have been opened already, so the uml_inetaddr_notifier | |
798 | * didn't get a chance to run for them. This fakes it so that | |
799 | * addresses which have already been set up get handled properly. | |
800 | */ | |
c862fc32 | 801 | spin_lock(&opened_lock); |
cd1ae0e4 | 802 | list_for_each(ele, &opened) { |
1da177e4 LT |
803 | lp = list_entry(ele, struct uml_net_private, list); |
804 | ip = lp->dev->ip_ptr; | |
cd1ae0e4 | 805 | if (ip == NULL) |
c862fc32 | 806 | continue; |
1da177e4 | 807 | in = ip->ifa_list; |
cd1ae0e4 | 808 | while (in != NULL) { |
1da177e4 LT |
809 | uml_inetaddr_event(NULL, NETDEV_UP, in); |
810 | in = in->ifa_next; | |
811 | } | |
f28169d2 | 812 | } |
c862fc32 | 813 | spin_unlock(&opened_lock); |
32f862c3 JD |
814 | } |
815 | #else | |
816 | static inline void inet_register(void) | |
817 | { | |
818 | } | |
819 | #endif | |
1da177e4 | 820 | |
32f862c3 JD |
821 | static int uml_net_init(void) |
822 | { | |
823 | mconsole_register_dev(&net_mc); | |
824 | inet_register(); | |
c862fc32 | 825 | return 0; |
1da177e4 LT |
826 | } |
827 | ||
828 | __initcall(uml_net_init); | |
829 | ||
830 | static void close_devices(void) | |
831 | { | |
832 | struct list_head *ele; | |
833 | struct uml_net_private *lp; | |
834 | ||
c862fc32 | 835 | spin_lock(&opened_lock); |
cd1ae0e4 | 836 | list_for_each(ele, &opened) { |
1da177e4 | 837 | lp = list_entry(ele, struct uml_net_private, list); |
fa7a0449 | 838 | um_free_irq(lp->dev->irq, lp->dev); |
cd1ae0e4 | 839 | if ((lp->close != NULL) && (lp->fd >= 0)) |
1da177e4 | 840 | (*lp->close)(lp->fd, &lp->user); |
cd1ae0e4 | 841 | if (lp->remove != NULL) |
c862fc32 | 842 | (*lp->remove)(&lp->user); |
1da177e4 | 843 | } |
c862fc32 | 844 | spin_unlock(&opened_lock); |
1da177e4 LT |
845 | } |
846 | ||
847 | __uml_exitcall(close_devices); | |
848 | ||
f28169d2 JD |
849 | void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *, |
850 | void *), | |
1da177e4 LT |
851 | void *arg) |
852 | { | |
853 | struct net_device *dev = d; | |
854 | struct in_device *ip = dev->ip_ptr; | |
855 | struct in_ifaddr *in; | |
856 | unsigned char address[4], netmask[4]; | |
857 | ||
cd1ae0e4 | 858 | if (ip == NULL) return; |
1da177e4 | 859 | in = ip->ifa_list; |
cd1ae0e4 | 860 | while (in != NULL) { |
0e76422c BS |
861 | memcpy(address, &in->ifa_address, sizeof(address)); |
862 | memcpy(netmask, &in->ifa_mask, sizeof(netmask)); | |
1da177e4 LT |
863 | (*cb)(address, netmask, arg); |
864 | in = in->ifa_next; | |
865 | } | |
866 | } | |
867 | ||
868 | int dev_netmask(void *d, void *m) | |
869 | { | |
870 | struct net_device *dev = d; | |
871 | struct in_device *ip = dev->ip_ptr; | |
872 | struct in_ifaddr *in; | |
a144ea4b | 873 | __be32 *mask_out = m; |
1da177e4 | 874 | |
cd1ae0e4 JD |
875 | if (ip == NULL) |
876 | return 1; | |
1da177e4 LT |
877 | |
878 | in = ip->ifa_list; | |
cd1ae0e4 JD |
879 | if (in == NULL) |
880 | return 1; | |
1da177e4 LT |
881 | |
882 | *mask_out = in->ifa_mask; | |
cd1ae0e4 | 883 | return 0; |
1da177e4 LT |
884 | } |
885 | ||
886 | void *get_output_buffer(int *len_out) | |
887 | { | |
888 | void *ret; | |
889 | ||
890 | ret = (void *) __get_free_pages(GFP_KERNEL, 0); | |
cd1ae0e4 | 891 | if (ret) *len_out = PAGE_SIZE; |
1da177e4 | 892 | else *len_out = 0; |
4ea21cd9 | 893 | return ret; |
1da177e4 LT |
894 | } |
895 | ||
896 | void free_output_buffer(void *buffer) | |
897 | { | |
898 | free_pages((unsigned long) buffer, 0); | |
899 | } | |
900 | ||
f28169d2 | 901 | int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out, |
1da177e4 LT |
902 | char **gate_addr) |
903 | { | |
904 | char *remain; | |
905 | ||
906 | remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL); | |
cd1ae0e4 JD |
907 | if (remain != NULL) { |
908 | printk(KERN_ERR "tap_setup_common - Extra garbage on " | |
909 | "specification : '%s'\n", remain); | |
910 | return 1; | |
1da177e4 LT |
911 | } |
912 | ||
cd1ae0e4 | 913 | return 0; |
1da177e4 LT |
914 | } |
915 | ||
916 | unsigned short eth_protocol(struct sk_buff *skb) | |
917 | { | |
cd1ae0e4 | 918 | return eth_type_trans(skb, skb->dev); |
1da177e4 | 919 | } |