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/spinlock.h>
23 #include "mconsole_kern.h"
27 static inline void set_ether_mac(struct net_device
*dev
, unsigned char *addr
)
29 memcpy(dev
->dev_addr
, addr
, ETH_ALEN
);
32 #define DRIVER_NAME "uml-netdev"
34 static DEFINE_SPINLOCK(opened_lock
);
35 static LIST_HEAD(opened
);
38 * The drop_skb is used when we can't allocate an skb. The
39 * packet is read into drop_skb in order to get the data off the
40 * connection to the host.
41 * It is reallocated whenever a maximum packet size is seen which is
42 * larger than any seen before. update_drop_skb is called from
43 * eth_configure when a new interface is added.
45 static DEFINE_SPINLOCK(drop_lock
);
46 static struct sk_buff
*drop_skb
;
49 static int update_drop_skb(int max
)
55 spin_lock_irqsave(&drop_lock
, flags
);
61 new = dev_alloc_skb(max
);
72 spin_unlock_irqrestore(&drop_lock
, flags
);
77 static int uml_net_rx(struct net_device
*dev
)
79 struct uml_net_private
*lp
= netdev_priv(dev
);
83 /* If we can't allocate memory, try again next round. */
84 skb
= dev_alloc_skb(lp
->max_packet
);
87 /* Read a packet into drop_skb and don't do anything with it. */
88 (*lp
->read
)(lp
->fd
, drop_skb
, lp
);
89 dev
->stats
.rx_dropped
++;
94 skb_put(skb
, lp
->max_packet
);
95 skb_reset_mac_header(skb
);
96 pkt_len
= (*lp
->read
)(lp
->fd
, skb
, lp
);
99 skb_trim(skb
, pkt_len
);
100 skb
->protocol
= (*lp
->protocol
)(skb
);
102 dev
->stats
.rx_bytes
+= skb
->len
;
103 dev
->stats
.rx_packets
++;
112 static void uml_dev_close(struct work_struct
*work
)
114 struct uml_net_private
*lp
=
115 container_of(work
, struct uml_net_private
, work
);
119 static irqreturn_t
uml_net_interrupt(int irq
, void *dev_id
)
121 struct net_device
*dev
= dev_id
;
122 struct uml_net_private
*lp
= netdev_priv(dev
);
125 if (!netif_running(dev
))
128 spin_lock(&lp
->lock
);
129 while ((err
= uml_net_rx(dev
)) > 0) ;
132 "Device '%s' read returned %d, shutting it down\n",
134 /* dev_close can't be called in interrupt context, and takes
136 * And dev_close() can be safely called multiple times on the
137 * same device, since it tests for (dev->flags & IFF_UP). So
138 * there's no harm in delaying the device shutdown.
139 * Furthermore, the workqueue will not re-enqueue an already
140 * enqueued work item. */
141 schedule_work(&lp
->work
);
144 reactivate_fd(lp
->fd
, UM_ETH_IRQ
);
147 spin_unlock(&lp
->lock
);
151 static int uml_net_open(struct net_device
*dev
)
153 struct uml_net_private
*lp
= netdev_priv(dev
);
161 lp
->fd
= (*lp
->open
)(&lp
->user
);
167 err
= um_request_irq(dev
->irq
, lp
->fd
, IRQ_READ
, uml_net_interrupt
,
168 IRQF_DISABLED
| IRQF_SHARED
, dev
->name
, dev
);
170 printk(KERN_ERR
"uml_net_open: failed to get irq(%d)\n", err
);
175 lp
->tl
.data
= (unsigned long) &lp
->user
;
176 netif_start_queue(dev
);
178 /* clear buffer - it can happen that the host side of the interface
179 * is full when we get here. In this case, new data is never queued,
180 * SIGIOs never arrive, and the net never works.
182 while ((err
= uml_net_rx(dev
)) > 0) ;
184 spin_lock(&opened_lock
);
185 list_add(&lp
->list
, &opened
);
186 spin_unlock(&opened_lock
);
190 if (lp
->close
!= NULL
) (*lp
->close
)(lp
->fd
, &lp
->user
);
196 static int uml_net_close(struct net_device
*dev
)
198 struct uml_net_private
*lp
= netdev_priv(dev
);
200 netif_stop_queue(dev
);
202 free_irq(dev
->irq
, dev
);
203 if (lp
->close
!= NULL
)
204 (*lp
->close
)(lp
->fd
, &lp
->user
);
207 spin_lock(&opened_lock
);
209 spin_unlock(&opened_lock
);
214 static int uml_net_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
216 struct uml_net_private
*lp
= netdev_priv(dev
);
220 netif_stop_queue(dev
);
222 spin_lock_irqsave(&lp
->lock
, flags
);
224 len
= (*lp
->write
)(lp
->fd
, skb
, lp
);
226 if (len
== skb
->len
) {
227 dev
->stats
.tx_packets
++;
228 dev
->stats
.tx_bytes
+= skb
->len
;
229 dev
->trans_start
= jiffies
;
230 netif_start_queue(dev
);
232 /* this is normally done in the interrupt when tx finishes */
233 netif_wake_queue(dev
);
236 netif_start_queue(dev
);
237 dev
->stats
.tx_dropped
++;
240 netif_start_queue(dev
);
241 printk(KERN_ERR
"uml_net_start_xmit: failed(%d)\n", len
);
244 spin_unlock_irqrestore(&lp
->lock
, flags
);
251 static void uml_net_set_multicast_list(struct net_device
*dev
)
256 static void uml_net_tx_timeout(struct net_device
*dev
)
258 dev
->trans_start
= jiffies
;
259 netif_wake_queue(dev
);
262 static int uml_net_set_mac(struct net_device
*dev
, void *addr
)
264 struct uml_net_private
*lp
= netdev_priv(dev
);
265 struct sockaddr
*hwaddr
= addr
;
267 spin_lock_irq(&lp
->lock
);
268 set_ether_mac(dev
, hwaddr
->sa_data
);
269 spin_unlock_irq(&lp
->lock
);
274 static int uml_net_change_mtu(struct net_device
*dev
, int new_mtu
)
281 static void uml_net_get_drvinfo(struct net_device
*dev
,
282 struct ethtool_drvinfo
*info
)
284 strcpy(info
->driver
, DRIVER_NAME
);
285 strcpy(info
->version
, "42");
288 static struct ethtool_ops uml_net_ethtool_ops
= {
289 .get_drvinfo
= uml_net_get_drvinfo
,
290 .get_link
= ethtool_op_get_link
,
293 static void uml_net_user_timer_expire(unsigned long _conn
)
296 struct connection
*conn
= (struct connection
*)_conn
;
298 dprintk(KERN_INFO
"uml_net_user_timer_expire [%p]\n", conn
);
303 static void setup_etheraddr(char *str
, unsigned char *addr
, char *name
)
311 for (i
= 0; i
< 6; i
++) {
312 addr
[i
] = simple_strtoul(str
, &end
, 16);
314 ((*end
!= ':') && (*end
!= ',') && (*end
!= '\0'))) {
316 "setup_etheraddr: failed to parse '%s' "
317 "as an ethernet address\n", str
);
322 if (is_multicast_ether_addr(addr
)) {
324 "Attempt to assign a multicast ethernet address to a "
325 "device disallowed\n");
328 if (!is_valid_ether_addr(addr
)) {
330 "Attempt to assign an invalid ethernet address to a "
331 "device disallowed\n");
334 if (!is_local_ether_addr(addr
)) {
336 "Warning: Assigning a globally valid ethernet "
337 "address to a device\n");
338 printk(KERN_WARNING
"You should set the 2nd rightmost bit in "
339 "the first byte of the MAC,\n");
340 printk(KERN_WARNING
"i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
341 addr
[0] | 0x02, addr
[1], addr
[2], addr
[3], addr
[4],
348 "Choosing a random ethernet address for device %s\n", name
);
349 random_ether_addr(addr
);
352 static DEFINE_SPINLOCK(devices_lock
);
353 static LIST_HEAD(devices
);
355 static struct platform_driver uml_net_driver
= {
361 static void net_device_release(struct device
*dev
)
363 struct uml_net
*device
= dev
->driver_data
;
364 struct net_device
*netdev
= device
->dev
;
365 struct uml_net_private
*lp
= netdev_priv(netdev
);
367 if (lp
->remove
!= NULL
)
368 (*lp
->remove
)(&lp
->user
);
369 list_del(&device
->list
);
375 * Ensures that platform_driver_register is called only once by
376 * eth_configure. Will be set in an initcall.
378 static int driver_registered
;
380 static void eth_configure(int n
, void *init
, char *mac
,
381 struct transport
*transport
)
383 struct uml_net
*device
;
384 struct net_device
*dev
;
385 struct uml_net_private
*lp
;
388 size
= transport
->private_size
+ sizeof(struct uml_net_private
);
390 device
= kzalloc(sizeof(*device
), GFP_KERNEL
);
391 if (device
== NULL
) {
392 printk(KERN_ERR
"eth_configure failed to allocate struct "
397 dev
= alloc_etherdev(size
);
399 printk(KERN_ERR
"eth_configure: failed to allocate struct "
400 "net_device for eth%d\n", n
);
401 goto out_free_device
;
404 INIT_LIST_HEAD(&device
->list
);
407 /* If this name ends up conflicting with an existing registered
408 * netdevice, that is OK, register_netdev{,ice}() will notice this
411 snprintf(dev
->name
, sizeof(dev
->name
), "eth%d", n
);
413 setup_etheraddr(mac
, device
->mac
, dev
->name
);
415 printk(KERN_INFO
"Netdevice %d (%pM) : ", n
, device
->mac
);
417 lp
= netdev_priv(dev
);
418 /* This points to the transport private data. It's still clear, but we
419 * must memset it to 0 *now*. Let's help the drivers. */
421 INIT_WORK(&lp
->work
, uml_dev_close
);
424 if (!driver_registered
) {
425 platform_driver_register(¨_net_driver
);
426 driver_registered
= 1;
429 device
->pdev
.name
= DRIVER_NAME
;
430 device
->pdev
.dev
.release
= net_device_release
;
431 device
->pdev
.dev
.driver_data
= device
;
432 if (platform_device_register(&device
->pdev
))
433 goto out_free_netdev
;
434 SET_NETDEV_DEV(dev
,&device
->pdev
.dev
);
439 * These just fill in a data structure, so there's no failure
440 * to be worried about.
442 (*transport
->kern
->init
)(dev
, init
);
444 *lp
= ((struct uml_net_private
)
445 { .list
= LIST_HEAD_INIT(lp
->list
),
448 .mac
= { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
449 .max_packet
= transport
->user
->max_packet
,
450 .protocol
= transport
->kern
->protocol
,
451 .open
= transport
->user
->open
,
452 .close
= transport
->user
->close
,
453 .remove
= transport
->user
->remove
,
454 .read
= transport
->kern
->read
,
455 .write
= transport
->kern
->write
,
456 .add_address
= transport
->user
->add_address
,
457 .delete_address
= transport
->user
->delete_address
});
460 spin_lock_init(&lp
->lock
);
461 lp
->tl
.function
= uml_net_user_timer_expire
;
462 memcpy(lp
->mac
, device
->mac
, sizeof(lp
->mac
));
464 if ((transport
->user
->init
!= NULL
) &&
465 ((*transport
->user
->init
)(&lp
->user
, dev
) != 0))
468 set_ether_mac(dev
, device
->mac
);
469 dev
->mtu
= transport
->user
->mtu
;
470 dev
->open
= uml_net_open
;
471 dev
->hard_start_xmit
= uml_net_start_xmit
;
472 dev
->stop
= uml_net_close
;
473 dev
->set_multicast_list
= uml_net_set_multicast_list
;
474 dev
->tx_timeout
= uml_net_tx_timeout
;
475 dev
->set_mac_address
= uml_net_set_mac
;
476 dev
->change_mtu
= uml_net_change_mtu
;
477 dev
->ethtool_ops
= ¨_net_ethtool_ops
;
478 dev
->watchdog_timeo
= (HZ
>> 1);
479 dev
->irq
= UM_ETH_IRQ
;
481 err
= update_drop_skb(lp
->max_packet
);
483 goto out_undo_user_init
;
486 err
= register_netdevice(dev
);
489 goto out_undo_user_init
;
491 spin_lock(&devices_lock
);
492 list_add(&device
->list
, &devices
);
493 spin_unlock(&devices_lock
);
498 if (transport
->user
->remove
!= NULL
)
499 (*transport
->user
->remove
)(&lp
->user
);
501 platform_device_unregister(&device
->pdev
);
502 return; /* platform_device_unregister frees dev and device */
509 static struct uml_net
*find_device(int n
)
511 struct uml_net
*device
;
512 struct list_head
*ele
;
514 spin_lock(&devices_lock
);
515 list_for_each(ele
, &devices
) {
516 device
= list_entry(ele
, struct uml_net
, list
);
517 if (device
->index
== n
)
522 spin_unlock(&devices_lock
);
526 static int eth_parse(char *str
, int *index_out
, char **str_out
,
530 int n
, err
= -EINVAL
;;
532 n
= simple_strtoul(str
, &end
, 0);
534 *error_out
= "Bad device number";
540 *error_out
= "Expected '=' after device number";
545 if (find_device(n
)) {
546 *error_out
= "Device already configured";
556 struct list_head list
;
561 static DEFINE_SPINLOCK(transports_lock
);
562 static LIST_HEAD(transports
);
564 /* Filled in during early boot */
565 static LIST_HEAD(eth_cmd_line
);
567 static int check_transport(struct transport
*transport
, char *eth
, int n
,
568 void **init_out
, char **mac_out
)
572 len
= strlen(transport
->name
);
573 if (strncmp(eth
, transport
->name
, len
))
579 else if (*eth
!= '\0')
582 *init_out
= kmalloc(transport
->setup_size
, GFP_KERNEL
);
583 if (*init_out
== NULL
)
586 if (!transport
->setup(eth
, mac_out
, *init_out
)) {
593 void register_transport(struct transport
*new)
595 struct list_head
*ele
, *next
;
596 struct eth_init
*eth
;
601 spin_lock(&transports_lock
);
602 BUG_ON(!list_empty(&new->list
));
603 list_add(&new->list
, &transports
);
604 spin_unlock(&transports_lock
);
606 list_for_each_safe(ele
, next
, ð_cmd_line
) {
607 eth
= list_entry(ele
, struct eth_init
, list
);
608 match
= check_transport(new, eth
->init
, eth
->index
, &init
,
612 else if (init
!= NULL
) {
613 eth_configure(eth
->index
, init
, mac
, new);
616 list_del(ð
->list
);
620 static int eth_setup_common(char *str
, int index
)
622 struct list_head
*ele
;
623 struct transport
*transport
;
628 spin_lock(&transports_lock
);
629 list_for_each(ele
, &transports
) {
630 transport
= list_entry(ele
, struct transport
, list
);
631 if (!check_transport(transport
, str
, index
, &init
, &mac
))
634 eth_configure(index
, init
, mac
, transport
);
641 spin_unlock(&transports_lock
);
645 static int __init
eth_setup(char *str
)
647 struct eth_init
*new;
651 err
= eth_parse(str
, &n
, &str
, &error
);
653 printk(KERN_ERR
"eth_setup - Couldn't parse '%s' : %s\n",
658 new = alloc_bootmem(sizeof(*new));
660 printk(KERN_ERR
"eth_init : alloc_bootmem failed\n");
664 INIT_LIST_HEAD(&new->list
);
668 list_add_tail(&new->list
, ð_cmd_line
);
672 __setup("eth", eth_setup
);
673 __uml_help(eth_setup
,
674 "eth[0-9]+=<transport>,<options>\n"
675 " Configure a network device.\n\n"
678 static int net_config(char *str
, char **error_out
)
682 err
= eth_parse(str
, &n
, &str
, error_out
);
686 /* This string is broken up and the pieces used by the underlying
687 * driver. So, it is freed only if eth_setup_common fails.
689 str
= kstrdup(str
, GFP_KERNEL
);
691 *error_out
= "net_config failed to strdup string";
694 err
= !eth_setup_common(str
, n
);
700 static int net_id(char **str
, int *start_out
, int *end_out
)
705 n
= simple_strtoul(*str
, &end
, 0);
706 if ((*end
!= '\0') || (end
== *str
))
715 static int net_remove(int n
, char **error_out
)
717 struct uml_net
*device
;
718 struct net_device
*dev
;
719 struct uml_net_private
*lp
;
721 device
= find_device(n
);
726 lp
= netdev_priv(dev
);
729 unregister_netdev(dev
);
730 platform_device_unregister(&device
->pdev
);
735 static struct mc_device net_mc
= {
736 .list
= LIST_HEAD_INIT(net_mc
.list
),
738 .config
= net_config
,
741 .remove
= net_remove
,
745 static int uml_inetaddr_event(struct notifier_block
*this, unsigned long event
,
748 struct in_ifaddr
*ifa
= ptr
;
749 struct net_device
*dev
= ifa
->ifa_dev
->dev
;
750 struct uml_net_private
*lp
;
751 void (*proc
)(unsigned char *, unsigned char *, void *);
752 unsigned char addr_buf
[4], netmask_buf
[4];
754 if (dev
->open
!= uml_net_open
)
757 lp
= netdev_priv(dev
);
762 proc
= lp
->add_address
;
765 proc
= lp
->delete_address
;
769 memcpy(addr_buf
, &ifa
->ifa_address
, sizeof(addr_buf
));
770 memcpy(netmask_buf
, &ifa
->ifa_mask
, sizeof(netmask_buf
));
771 (*proc
)(addr_buf
, netmask_buf
, &lp
->user
);
776 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
777 static struct notifier_block uml_inetaddr_notifier
= {
778 .notifier_call
= uml_inetaddr_event
,
781 static void inet_register(void)
783 struct list_head
*ele
;
784 struct uml_net_private
*lp
;
785 struct in_device
*ip
;
786 struct in_ifaddr
*in
;
788 register_inetaddr_notifier(¨_inetaddr_notifier
);
790 /* Devices may have been opened already, so the uml_inetaddr_notifier
791 * didn't get a chance to run for them. This fakes it so that
792 * addresses which have already been set up get handled properly.
794 spin_lock(&opened_lock
);
795 list_for_each(ele
, &opened
) {
796 lp
= list_entry(ele
, struct uml_net_private
, list
);
797 ip
= lp
->dev
->ip_ptr
;
802 uml_inetaddr_event(NULL
, NETDEV_UP
, in
);
806 spin_unlock(&opened_lock
);
809 static inline void inet_register(void)
814 static int uml_net_init(void)
816 mconsole_register_dev(&net_mc
);
821 __initcall(uml_net_init
);
823 static void close_devices(void)
825 struct list_head
*ele
;
826 struct uml_net_private
*lp
;
828 spin_lock(&opened_lock
);
829 list_for_each(ele
, &opened
) {
830 lp
= list_entry(ele
, struct uml_net_private
, list
);
831 free_irq(lp
->dev
->irq
, lp
->dev
);
832 if ((lp
->close
!= NULL
) && (lp
->fd
>= 0))
833 (*lp
->close
)(lp
->fd
, &lp
->user
);
834 if (lp
->remove
!= NULL
)
835 (*lp
->remove
)(&lp
->user
);
837 spin_unlock(&opened_lock
);
840 __uml_exitcall(close_devices
);
842 void iter_addresses(void *d
, void (*cb
)(unsigned char *, unsigned char *,
846 struct net_device
*dev
= d
;
847 struct in_device
*ip
= dev
->ip_ptr
;
848 struct in_ifaddr
*in
;
849 unsigned char address
[4], netmask
[4];
851 if (ip
== NULL
) return;
854 memcpy(address
, &in
->ifa_address
, sizeof(address
));
855 memcpy(netmask
, &in
->ifa_mask
, sizeof(netmask
));
856 (*cb
)(address
, netmask
, arg
);
861 int dev_netmask(void *d
, void *m
)
863 struct net_device
*dev
= d
;
864 struct in_device
*ip
= dev
->ip_ptr
;
865 struct in_ifaddr
*in
;
866 __be32
*mask_out
= m
;
875 *mask_out
= in
->ifa_mask
;
879 void *get_output_buffer(int *len_out
)
883 ret
= (void *) __get_free_pages(GFP_KERNEL
, 0);
884 if (ret
) *len_out
= PAGE_SIZE
;
889 void free_output_buffer(void *buffer
)
891 free_pages((unsigned long) buffer
, 0);
894 int tap_setup_common(char *str
, char *type
, char **dev_name
, char **mac_out
,
899 remain
= split_if_spec(str
, dev_name
, mac_out
, gate_addr
, NULL
);
900 if (remain
!= NULL
) {
901 printk(KERN_ERR
"tap_setup_common - Extra garbage on "
902 "specification : '%s'\n", remain
);
909 unsigned short eth_protocol(struct sk_buff
*skb
)
911 return eth_type_trans(skb
, skb
->dev
);