2 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
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.
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>
19 #include <linux/slab.h>
20 #include <linux/spinlock.h>
24 #include "mconsole_kern.h"
28 #define DRIVER_NAME "uml-netdev"
30 static DEFINE_SPINLOCK(opened_lock
);
31 static LIST_HEAD(opened
);
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.
41 static DEFINE_SPINLOCK(drop_lock
);
42 static struct sk_buff
*drop_skb
;
45 static int update_drop_skb(int max
)
51 spin_lock_irqsave(&drop_lock
, flags
);
57 new = dev_alloc_skb(max
);
68 spin_unlock_irqrestore(&drop_lock
, flags
);
73 static int uml_net_rx(struct net_device
*dev
)
75 struct uml_net_private
*lp
= netdev_priv(dev
);
79 /* If we can't allocate memory, try again next round. */
80 skb
= dev_alloc_skb(lp
->max_packet
);
83 /* Read a packet into drop_skb and don't do anything with it. */
84 (*lp
->read
)(lp
->fd
, drop_skb
, lp
);
85 dev
->stats
.rx_dropped
++;
90 skb_put(skb
, lp
->max_packet
);
91 skb_reset_mac_header(skb
);
92 pkt_len
= (*lp
->read
)(lp
->fd
, skb
, lp
);
95 skb_trim(skb
, pkt_len
);
96 skb
->protocol
= (*lp
->protocol
)(skb
);
98 dev
->stats
.rx_bytes
+= skb
->len
;
99 dev
->stats
.rx_packets
++;
108 static void uml_dev_close(struct work_struct
*work
)
110 struct uml_net_private
*lp
=
111 container_of(work
, struct uml_net_private
, work
);
115 static irqreturn_t
uml_net_interrupt(int irq
, void *dev_id
)
117 struct net_device
*dev
= dev_id
;
118 struct uml_net_private
*lp
= netdev_priv(dev
);
121 if (!netif_running(dev
))
124 spin_lock(&lp
->lock
);
125 while ((err
= uml_net_rx(dev
)) > 0) ;
128 "Device '%s' read returned %d, shutting it down\n",
130 /* dev_close can't be called in interrupt context, and takes
132 * And dev_close() can be safely called multiple times on the
133 * same device, since it tests for (dev->flags & IFF_UP). So
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
);
140 reactivate_fd(lp
->fd
, UM_ETH_IRQ
);
143 spin_unlock(&lp
->lock
);
147 static int uml_net_open(struct net_device
*dev
)
149 struct uml_net_private
*lp
= netdev_priv(dev
);
157 lp
->fd
= (*lp
->open
)(&lp
->user
);
163 err
= um_request_irq(dev
->irq
, lp
->fd
, IRQ_READ
, uml_net_interrupt
,
164 IRQF_DISABLED
| IRQF_SHARED
, dev
->name
, dev
);
166 printk(KERN_ERR
"uml_net_open: failed to get irq(%d)\n", err
);
171 lp
->tl
.data
= (unsigned long) &lp
->user
;
172 netif_start_queue(dev
);
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.
178 while ((err
= uml_net_rx(dev
)) > 0) ;
180 spin_lock(&opened_lock
);
181 list_add(&lp
->list
, &opened
);
182 spin_unlock(&opened_lock
);
186 if (lp
->close
!= NULL
) (*lp
->close
)(lp
->fd
, &lp
->user
);
192 static int uml_net_close(struct net_device
*dev
)
194 struct uml_net_private
*lp
= netdev_priv(dev
);
196 netif_stop_queue(dev
);
198 free_irq(dev
->irq
, dev
);
199 if (lp
->close
!= NULL
)
200 (*lp
->close
)(lp
->fd
, &lp
->user
);
203 spin_lock(&opened_lock
);
205 spin_unlock(&opened_lock
);
210 static int uml_net_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
212 struct uml_net_private
*lp
= netdev_priv(dev
);
216 netif_stop_queue(dev
);
218 spin_lock_irqsave(&lp
->lock
, flags
);
220 len
= (*lp
->write
)(lp
->fd
, skb
, lp
);
222 if (len
== skb
->len
) {
223 dev
->stats
.tx_packets
++;
224 dev
->stats
.tx_bytes
+= skb
->len
;
225 dev
->trans_start
= jiffies
;
226 netif_start_queue(dev
);
228 /* this is normally done in the interrupt when tx finishes */
229 netif_wake_queue(dev
);
232 netif_start_queue(dev
);
233 dev
->stats
.tx_dropped
++;
236 netif_start_queue(dev
);
237 printk(KERN_ERR
"uml_net_start_xmit: failed(%d)\n", len
);
240 spin_unlock_irqrestore(&lp
->lock
, flags
);
247 static void uml_net_set_multicast_list(struct net_device
*dev
)
252 static void uml_net_tx_timeout(struct net_device
*dev
)
254 dev
->trans_start
= jiffies
;
255 netif_wake_queue(dev
);
258 static int uml_net_change_mtu(struct net_device
*dev
, int new_mtu
)
265 #ifdef CONFIG_NET_POLL_CONTROLLER
266 static void uml_net_poll_controller(struct net_device
*dev
)
268 disable_irq(dev
->irq
);
269 uml_net_interrupt(dev
->irq
, dev
);
270 enable_irq(dev
->irq
);
274 static void uml_net_get_drvinfo(struct net_device
*dev
,
275 struct ethtool_drvinfo
*info
)
277 strcpy(info
->driver
, DRIVER_NAME
);
278 strcpy(info
->version
, "42");
281 static const struct ethtool_ops uml_net_ethtool_ops
= {
282 .get_drvinfo
= uml_net_get_drvinfo
,
283 .get_link
= ethtool_op_get_link
,
286 static void uml_net_user_timer_expire(unsigned long _conn
)
289 struct connection
*conn
= (struct connection
*)_conn
;
291 dprintk(KERN_INFO
"uml_net_user_timer_expire [%p]\n", conn
);
296 static void setup_etheraddr(char *str
, unsigned char *addr
, char *name
)
304 for (i
= 0; i
< 6; i
++) {
305 addr
[i
] = simple_strtoul(str
, &end
, 16);
307 ((*end
!= ':') && (*end
!= ',') && (*end
!= '\0'))) {
309 "setup_etheraddr: failed to parse '%s' "
310 "as an ethernet address\n", str
);
315 if (is_multicast_ether_addr(addr
)) {
317 "Attempt to assign a multicast ethernet address to a "
318 "device disallowed\n");
321 if (!is_valid_ether_addr(addr
)) {
323 "Attempt to assign an invalid ethernet address to a "
324 "device disallowed\n");
327 if (!is_local_ether_addr(addr
)) {
329 "Warning: Assigning a globally valid ethernet "
330 "address to a device\n");
331 printk(KERN_WARNING
"You should set the 2nd rightmost bit in "
332 "the first byte of the MAC,\n");
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],
341 "Choosing a random ethernet address for device %s\n", name
);
342 random_ether_addr(addr
);
345 static DEFINE_SPINLOCK(devices_lock
);
346 static LIST_HEAD(devices
);
348 static struct platform_driver uml_net_driver
= {
354 static void net_device_release(struct device
*dev
)
356 struct uml_net
*device
= dev_get_drvdata(dev
);
357 struct net_device
*netdev
= device
->dev
;
358 struct uml_net_private
*lp
= netdev_priv(netdev
);
360 if (lp
->remove
!= NULL
)
361 (*lp
->remove
)(&lp
->user
);
362 list_del(&device
->list
);
367 static const struct net_device_ops uml_netdev_ops
= {
368 .ndo_open
= uml_net_open
,
369 .ndo_stop
= uml_net_close
,
370 .ndo_start_xmit
= uml_net_start_xmit
,
371 .ndo_set_rx_mode
= uml_net_set_multicast_list
,
372 .ndo_tx_timeout
= uml_net_tx_timeout
,
373 .ndo_set_mac_address
= eth_mac_addr
,
374 .ndo_change_mtu
= uml_net_change_mtu
,
375 .ndo_validate_addr
= eth_validate_addr
,
376 #ifdef CONFIG_NET_POLL_CONTROLLER
377 .ndo_poll_controller
= uml_net_poll_controller
,
382 * Ensures that platform_driver_register is called only once by
383 * eth_configure. Will be set in an initcall.
385 static int driver_registered
;
387 static void eth_configure(int n
, void *init
, char *mac
,
388 struct transport
*transport
)
390 struct uml_net
*device
;
391 struct net_device
*dev
;
392 struct uml_net_private
*lp
;
395 size
= transport
->private_size
+ sizeof(struct uml_net_private
);
397 device
= kzalloc(sizeof(*device
), GFP_KERNEL
);
398 if (device
== NULL
) {
399 printk(KERN_ERR
"eth_configure failed to allocate struct "
404 dev
= alloc_etherdev(size
);
406 printk(KERN_ERR
"eth_configure: failed to allocate struct "
407 "net_device for eth%d\n", n
);
408 goto out_free_device
;
411 INIT_LIST_HEAD(&device
->list
);
414 /* If this name ends up conflicting with an existing registered
415 * netdevice, that is OK, register_netdev{,ice}() will notice this
418 snprintf(dev
->name
, sizeof(dev
->name
), "eth%d", n
);
420 setup_etheraddr(mac
, device
->mac
, dev
->name
);
422 printk(KERN_INFO
"Netdevice %d (%pM) : ", n
, device
->mac
);
424 lp
= netdev_priv(dev
);
425 /* This points to the transport private data. It's still clear, but we
426 * must memset it to 0 *now*. Let's help the drivers. */
428 INIT_WORK(&lp
->work
, uml_dev_close
);
431 if (!driver_registered
) {
432 platform_driver_register(¨_net_driver
);
433 driver_registered
= 1;
436 device
->pdev
.name
= DRIVER_NAME
;
437 device
->pdev
.dev
.release
= net_device_release
;
438 dev_set_drvdata(&device
->pdev
.dev
, device
);
439 if (platform_device_register(&device
->pdev
))
440 goto out_free_netdev
;
441 SET_NETDEV_DEV(dev
,&device
->pdev
.dev
);
446 * These just fill in a data structure, so there's no failure
447 * to be worried about.
449 (*transport
->kern
->init
)(dev
, init
);
451 *lp
= ((struct uml_net_private
)
452 { .list
= LIST_HEAD_INIT(lp
->list
),
455 .mac
= { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
456 .max_packet
= transport
->user
->max_packet
,
457 .protocol
= transport
->kern
->protocol
,
458 .open
= transport
->user
->open
,
459 .close
= transport
->user
->close
,
460 .remove
= transport
->user
->remove
,
461 .read
= transport
->kern
->read
,
462 .write
= transport
->kern
->write
,
463 .add_address
= transport
->user
->add_address
,
464 .delete_address
= transport
->user
->delete_address
});
467 spin_lock_init(&lp
->lock
);
468 lp
->tl
.function
= uml_net_user_timer_expire
;
469 memcpy(lp
->mac
, device
->mac
, sizeof(lp
->mac
));
471 if ((transport
->user
->init
!= NULL
) &&
472 ((*transport
->user
->init
)(&lp
->user
, dev
) != 0))
475 /* don't use eth_mac_addr, it will not work here */
476 memcpy(dev
->dev_addr
, device
->mac
, ETH_ALEN
);
477 dev
->mtu
= transport
->user
->mtu
;
478 dev
->netdev_ops
= ¨_netdev_ops
;
479 dev
->ethtool_ops
= ¨_net_ethtool_ops
;
480 dev
->watchdog_timeo
= (HZ
>> 1);
481 dev
->irq
= UM_ETH_IRQ
;
483 err
= update_drop_skb(lp
->max_packet
);
485 goto out_undo_user_init
;
488 err
= register_netdevice(dev
);
491 goto out_undo_user_init
;
493 spin_lock(&devices_lock
);
494 list_add(&device
->list
, &devices
);
495 spin_unlock(&devices_lock
);
500 if (transport
->user
->remove
!= NULL
)
501 (*transport
->user
->remove
)(&lp
->user
);
503 platform_device_unregister(&device
->pdev
);
504 return; /* platform_device_unregister frees dev and device */
511 static struct uml_net
*find_device(int n
)
513 struct uml_net
*device
;
514 struct list_head
*ele
;
516 spin_lock(&devices_lock
);
517 list_for_each(ele
, &devices
) {
518 device
= list_entry(ele
, struct uml_net
, list
);
519 if (device
->index
== n
)
524 spin_unlock(&devices_lock
);
528 static int eth_parse(char *str
, int *index_out
, char **str_out
,
532 int n
, err
= -EINVAL
;
534 n
= simple_strtoul(str
, &end
, 0);
536 *error_out
= "Bad device number";
542 *error_out
= "Expected '=' after device number";
547 if (find_device(n
)) {
548 *error_out
= "Device already configured";
558 struct list_head list
;
563 static DEFINE_SPINLOCK(transports_lock
);
564 static LIST_HEAD(transports
);
566 /* Filled in during early boot */
567 static LIST_HEAD(eth_cmd_line
);
569 static int check_transport(struct transport
*transport
, char *eth
, int n
,
570 void **init_out
, char **mac_out
)
574 len
= strlen(transport
->name
);
575 if (strncmp(eth
, transport
->name
, len
))
581 else if (*eth
!= '\0')
584 *init_out
= kmalloc(transport
->setup_size
, GFP_KERNEL
);
585 if (*init_out
== NULL
)
588 if (!transport
->setup(eth
, mac_out
, *init_out
)) {
595 void register_transport(struct transport
*new)
597 struct list_head
*ele
, *next
;
598 struct eth_init
*eth
;
603 spin_lock(&transports_lock
);
604 BUG_ON(!list_empty(&new->list
));
605 list_add(&new->list
, &transports
);
606 spin_unlock(&transports_lock
);
608 list_for_each_safe(ele
, next
, ð_cmd_line
) {
609 eth
= list_entry(ele
, struct eth_init
, list
);
610 match
= check_transport(new, eth
->init
, eth
->index
, &init
,
614 else if (init
!= NULL
) {
615 eth_configure(eth
->index
, init
, mac
, new);
618 list_del(ð
->list
);
622 static int eth_setup_common(char *str
, int index
)
624 struct list_head
*ele
;
625 struct transport
*transport
;
630 spin_lock(&transports_lock
);
631 list_for_each(ele
, &transports
) {
632 transport
= list_entry(ele
, struct transport
, list
);
633 if (!check_transport(transport
, str
, index
, &init
, &mac
))
636 eth_configure(index
, init
, mac
, transport
);
643 spin_unlock(&transports_lock
);
647 static int __init
eth_setup(char *str
)
649 struct eth_init
*new;
653 err
= eth_parse(str
, &n
, &str
, &error
);
655 printk(KERN_ERR
"eth_setup - Couldn't parse '%s' : %s\n",
660 new = alloc_bootmem(sizeof(*new));
662 printk(KERN_ERR
"eth_init : alloc_bootmem failed\n");
666 INIT_LIST_HEAD(&new->list
);
670 list_add_tail(&new->list
, ð_cmd_line
);
674 __setup("eth", eth_setup
);
675 __uml_help(eth_setup
,
676 "eth[0-9]+=<transport>,<options>\n"
677 " Configure a network device.\n\n"
680 static int net_config(char *str
, char **error_out
)
684 err
= eth_parse(str
, &n
, &str
, error_out
);
688 /* This string is broken up and the pieces used by the underlying
689 * driver. So, it is freed only if eth_setup_common fails.
691 str
= kstrdup(str
, GFP_KERNEL
);
693 *error_out
= "net_config failed to strdup string";
696 err
= !eth_setup_common(str
, n
);
702 static int net_id(char **str
, int *start_out
, int *end_out
)
707 n
= simple_strtoul(*str
, &end
, 0);
708 if ((*end
!= '\0') || (end
== *str
))
717 static int net_remove(int n
, char **error_out
)
719 struct uml_net
*device
;
720 struct net_device
*dev
;
721 struct uml_net_private
*lp
;
723 device
= find_device(n
);
728 lp
= netdev_priv(dev
);
731 unregister_netdev(dev
);
732 platform_device_unregister(&device
->pdev
);
737 static struct mc_device net_mc
= {
738 .list
= LIST_HEAD_INIT(net_mc
.list
),
740 .config
= net_config
,
743 .remove
= net_remove
,
747 static int uml_inetaddr_event(struct notifier_block
*this, unsigned long event
,
750 struct in_ifaddr
*ifa
= ptr
;
751 struct net_device
*dev
= ifa
->ifa_dev
->dev
;
752 struct uml_net_private
*lp
;
753 void (*proc
)(unsigned char *, unsigned char *, void *);
754 unsigned char addr_buf
[4], netmask_buf
[4];
756 if (dev
->netdev_ops
->ndo_open
!= uml_net_open
)
759 lp
= netdev_priv(dev
);
764 proc
= lp
->add_address
;
767 proc
= lp
->delete_address
;
771 memcpy(addr_buf
, &ifa
->ifa_address
, sizeof(addr_buf
));
772 memcpy(netmask_buf
, &ifa
->ifa_mask
, sizeof(netmask_buf
));
773 (*proc
)(addr_buf
, netmask_buf
, &lp
->user
);
778 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
779 static struct notifier_block uml_inetaddr_notifier
= {
780 .notifier_call
= uml_inetaddr_event
,
783 static void inet_register(void)
785 struct list_head
*ele
;
786 struct uml_net_private
*lp
;
787 struct in_device
*ip
;
788 struct in_ifaddr
*in
;
790 register_inetaddr_notifier(¨_inetaddr_notifier
);
792 /* Devices may have been opened already, so the uml_inetaddr_notifier
793 * didn't get a chance to run for them. This fakes it so that
794 * addresses which have already been set up get handled properly.
796 spin_lock(&opened_lock
);
797 list_for_each(ele
, &opened
) {
798 lp
= list_entry(ele
, struct uml_net_private
, list
);
799 ip
= lp
->dev
->ip_ptr
;
804 uml_inetaddr_event(NULL
, NETDEV_UP
, in
);
808 spin_unlock(&opened_lock
);
811 static inline void inet_register(void)
816 static int uml_net_init(void)
818 mconsole_register_dev(&net_mc
);
823 __initcall(uml_net_init
);
825 static void close_devices(void)
827 struct list_head
*ele
;
828 struct uml_net_private
*lp
;
830 spin_lock(&opened_lock
);
831 list_for_each(ele
, &opened
) {
832 lp
= list_entry(ele
, struct uml_net_private
, list
);
833 free_irq(lp
->dev
->irq
, lp
->dev
);
834 if ((lp
->close
!= NULL
) && (lp
->fd
>= 0))
835 (*lp
->close
)(lp
->fd
, &lp
->user
);
836 if (lp
->remove
!= NULL
)
837 (*lp
->remove
)(&lp
->user
);
839 spin_unlock(&opened_lock
);
842 __uml_exitcall(close_devices
);
844 void iter_addresses(void *d
, void (*cb
)(unsigned char *, unsigned char *,
848 struct net_device
*dev
= d
;
849 struct in_device
*ip
= dev
->ip_ptr
;
850 struct in_ifaddr
*in
;
851 unsigned char address
[4], netmask
[4];
853 if (ip
== NULL
) return;
856 memcpy(address
, &in
->ifa_address
, sizeof(address
));
857 memcpy(netmask
, &in
->ifa_mask
, sizeof(netmask
));
858 (*cb
)(address
, netmask
, arg
);
863 int dev_netmask(void *d
, void *m
)
865 struct net_device
*dev
= d
;
866 struct in_device
*ip
= dev
->ip_ptr
;
867 struct in_ifaddr
*in
;
868 __be32
*mask_out
= m
;
877 *mask_out
= in
->ifa_mask
;
881 void *get_output_buffer(int *len_out
)
885 ret
= (void *) __get_free_pages(GFP_KERNEL
, 0);
886 if (ret
) *len_out
= PAGE_SIZE
;
891 void free_output_buffer(void *buffer
)
893 free_pages((unsigned long) buffer
, 0);
896 int tap_setup_common(char *str
, char *type
, char **dev_name
, char **mac_out
,
901 remain
= split_if_spec(str
, dev_name
, mac_out
, gate_addr
, NULL
);
902 if (remain
!= NULL
) {
903 printk(KERN_ERR
"tap_setup_common - Extra garbage on "
904 "specification : '%s'\n", remain
);
911 unsigned short eth_protocol(struct sk_buff
*skb
)
913 return eth_type_trans(skb
, skb
->dev
);