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OpenCloudOS-Kernel/arch/um/drivers/net_kern.c

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/*
* Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
* James Leu (jleu@mindspring.net).
* Copyright (C) 2001 by various other people who didn't put their name here.
* Licensed under the GPL.
*/
#include "linux/kernel.h"
#include "linux/netdevice.h"
#include "linux/rtnetlink.h"
#include "linux/skbuff.h"
#include "linux/socket.h"
#include "linux/spinlock.h"
#include "linux/module.h"
#include "linux/init.h"
#include "linux/etherdevice.h"
#include "linux/list.h"
#include "linux/inetdevice.h"
#include "linux/ctype.h"
#include "linux/bootmem.h"
#include "linux/ethtool.h"
#include "linux/platform_device.h"
#include "asm/uaccess.h"
#include "user_util.h"
#include "kern_util.h"
#include "net_kern.h"
#include "net_user.h"
#include "mconsole_kern.h"
#include "init.h"
#include "irq_user.h"
#include "irq_kern.h"
static inline void set_ether_mac(struct net_device *dev, unsigned char *addr)
{
memcpy(dev->dev_addr, addr, ETH_ALEN);
}
#define DRIVER_NAME "uml-netdev"
static DEFINE_SPINLOCK(opened_lock);
static LIST_HEAD(opened);
static int uml_net_rx(struct net_device *dev)
{
struct uml_net_private *lp = dev->priv;
int pkt_len;
struct sk_buff *skb;
/* If we can't allocate memory, try again next round. */
skb = dev_alloc_skb(dev->mtu);
if (skb == NULL) {
lp->stats.rx_dropped++;
return 0;
}
skb->dev = dev;
skb_put(skb, dev->mtu);
skb->mac.raw = skb->data;
pkt_len = (*lp->read)(lp->fd, &skb, lp);
if (pkt_len > 0) {
skb_trim(skb, pkt_len);
skb->protocol = (*lp->protocol)(skb);
netif_rx(skb);
lp->stats.rx_bytes += skb->len;
lp->stats.rx_packets++;
return pkt_len;
}
kfree_skb(skb);
return pkt_len;
}
static void uml_dev_close(struct work_struct *work)
{
struct uml_net_private *lp =
container_of(work, struct uml_net_private, work);
dev_close(lp->dev);
}
irqreturn_t uml_net_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct uml_net_private *lp = dev->priv;
int err;
if(!netif_running(dev))
return(IRQ_NONE);
spin_lock(&lp->lock);
while((err = uml_net_rx(dev)) > 0) ;
if(err < 0) {
printk(KERN_ERR
"Device '%s' read returned %d, shutting it down\n",
dev->name, err);
/* dev_close can't be called in interrupt context, and takes
* again lp->lock.
* And dev_close() can be safely called multiple times on the
* same device, since it tests for (dev->flags & IFF_UP). So
* there's no harm in delaying the device shutdown.
* Furthermore, the workqueue will not re-enqueue an already
* enqueued work item. */
schedule_work(&lp->work);
goto out;
}
reactivate_fd(lp->fd, UM_ETH_IRQ);
out:
spin_unlock(&lp->lock);
return(IRQ_HANDLED);
}
static int uml_net_open(struct net_device *dev)
{
struct uml_net_private *lp = dev->priv;
int err;
if(lp->fd >= 0){
err = -ENXIO;
goto out;
}
lp->fd = (*lp->open)(&lp->user);
if(lp->fd < 0){
err = lp->fd;
goto out;
}
err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
IRQF_DISABLED | IRQF_SHARED, dev->name, dev);
if(err != 0){
printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
err = -ENETUNREACH;
goto out_close;
}
lp->tl.data = (unsigned long) &lp->user;
netif_start_queue(dev);
/* clear buffer - it can happen that the host side of the interface
* is full when we get here. In this case, new data is never queued,
* SIGIOs never arrive, and the net never works.
*/
while((err = uml_net_rx(dev)) > 0) ;
spin_lock(&opened_lock);
list_add(&lp->list, &opened);
spin_unlock(&opened_lock);
return 0;
out_close:
if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
lp->fd = -1;
out:
return err;
}
static int uml_net_close(struct net_device *dev)
{
struct uml_net_private *lp = dev->priv;
netif_stop_queue(dev);
free_irq(dev->irq, dev);
if(lp->close != NULL)
(*lp->close)(lp->fd, &lp->user);
lp->fd = -1;
spin_lock(&opened_lock);
list_del(&lp->list);
spin_unlock(&opened_lock);
return 0;
}
static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct uml_net_private *lp = dev->priv;
unsigned long flags;
int len;
netif_stop_queue(dev);
spin_lock_irqsave(&lp->lock, flags);
len = (*lp->write)(lp->fd, &skb, lp);
if(len == skb->len) {
lp->stats.tx_packets++;
lp->stats.tx_bytes += skb->len;
dev->trans_start = jiffies;
netif_start_queue(dev);
/* this is normally done in the interrupt when tx finishes */
netif_wake_queue(dev);
}
else if(len == 0){
netif_start_queue(dev);
lp->stats.tx_dropped++;
}
else {
netif_start_queue(dev);
printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
}
spin_unlock_irqrestore(&lp->lock, flags);
dev_kfree_skb(skb);
return 0;
}
static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
{
struct uml_net_private *lp = dev->priv;
return &lp->stats;
}
static void uml_net_set_multicast_list(struct net_device *dev)
{
if (dev->flags & IFF_PROMISC) return;
else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
else dev->flags &= ~IFF_ALLMULTI;
}
static void uml_net_tx_timeout(struct net_device *dev)
{
dev->trans_start = jiffies;
netif_wake_queue(dev);
}
static int uml_net_set_mac(struct net_device *dev, void *addr)
{
struct uml_net_private *lp = dev->priv;
struct sockaddr *hwaddr = addr;
spin_lock_irq(&lp->lock);
set_ether_mac(dev, hwaddr->sa_data);
spin_unlock_irq(&lp->lock);
return(0);
}
static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
{
struct uml_net_private *lp = dev->priv;
int err = 0;
spin_lock_irq(&lp->lock);
new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
if(new_mtu < 0){
err = new_mtu;
goto out;
}
dev->mtu = new_mtu;
out:
spin_unlock_irq(&lp->lock);
return err;
}
static void uml_net_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *info)
{
strcpy(info->driver, DRIVER_NAME);
strcpy(info->version, "42");
}
static struct ethtool_ops uml_net_ethtool_ops = {
.get_drvinfo = uml_net_get_drvinfo,
.get_link = ethtool_op_get_link,
};
void uml_net_user_timer_expire(unsigned long _conn)
{
#ifdef undef
struct connection *conn = (struct connection *)_conn;
dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
do_connect(conn);
#endif
}
static void setup_etheraddr(char *str, unsigned char *addr)
{
char *end;
int i;
if(str == NULL)
goto random;
for(i=0;i<6;i++){
addr[i] = simple_strtoul(str, &end, 16);
if((end == str) ||
((*end != ':') && (*end != ',') && (*end != '\0'))){
printk(KERN_ERR
"setup_etheraddr: failed to parse '%s' "
"as an ethernet address\n", str);
goto random;
}
str = end + 1;
}
if(addr[0] & 1){
printk(KERN_ERR
"Attempt to assign a broadcast ethernet address to a "
"device disallowed\n");
goto random;
}
return;
random:
random_ether_addr(addr);
}
static DEFINE_SPINLOCK(devices_lock);
static LIST_HEAD(devices);
static struct platform_driver uml_net_driver = {
.driver = {
.name = DRIVER_NAME,
},
};
static int driver_registered;
static int eth_configure(int n, void *init, char *mac,
struct transport *transport)
{
struct uml_net *device;
struct net_device *dev;
struct uml_net_private *lp;
int save, err, size;
size = transport->private_size + sizeof(struct uml_net_private) +
sizeof(((struct uml_net_private *) 0)->user);
device = kzalloc(sizeof(*device), GFP_KERNEL);
if (device == NULL) {
printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
return(1);
}
INIT_LIST_HEAD(&device->list);
device->index = n;
spin_lock(&devices_lock);
list_add(&device->list, &devices);
spin_unlock(&devices_lock);
setup_etheraddr(mac, device->mac);
printk(KERN_INFO "Netdevice %d ", n);
printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
device->mac[0], device->mac[1],
device->mac[2], device->mac[3],
device->mac[4], device->mac[5]);
printk(": ");
dev = alloc_etherdev(size);
if (dev == NULL) {
printk(KERN_ERR "eth_configure: failed to allocate device\n");
return 1;
}
lp = dev->priv;
/* This points to the transport private data. It's still clear, but we
* must memset it to 0 *now*. Let's help the drivers. */
memset(lp, 0, size);
INIT_WORK(&lp->work, uml_dev_close);
/* sysfs register */
if (!driver_registered) {
platform_driver_register(&uml_net_driver);
driver_registered = 1;
}
device->pdev.id = n;
device->pdev.name = DRIVER_NAME;
platform_device_register(&device->pdev);
SET_NETDEV_DEV(dev,&device->pdev.dev);
/* If this name ends up conflicting with an existing registered
* netdevice, that is OK, register_netdev{,ice}() will notice this
* and fail.
*/
snprintf(dev->name, sizeof(dev->name), "eth%d", n);
device->dev = dev;
(*transport->kern->init)(dev, init);
dev->mtu = transport->user->max_packet;
dev->open = uml_net_open;
dev->hard_start_xmit = uml_net_start_xmit;
dev->stop = uml_net_close;
dev->get_stats = uml_net_get_stats;
dev->set_multicast_list = uml_net_set_multicast_list;
dev->tx_timeout = uml_net_tx_timeout;
dev->set_mac_address = uml_net_set_mac;
dev->change_mtu = uml_net_change_mtu;
dev->ethtool_ops = &uml_net_ethtool_ops;
dev->watchdog_timeo = (HZ >> 1);
dev->irq = UM_ETH_IRQ;
rtnl_lock();
err = register_netdevice(dev);
rtnl_unlock();
if (err) {
device->dev = NULL;
/* XXX: should we call ->remove() here? */
free_netdev(dev);
return 1;
}
/* lp.user is the first four bytes of the transport data, which
* has already been initialized. This structure assignment will
* overwrite that, so we make sure that .user gets overwritten with
* what it already has.
*/
save = lp->user[0];
*lp = ((struct uml_net_private)
{ .list = LIST_HEAD_INIT(lp->list),
.dev = dev,
.fd = -1,
.mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
.protocol = transport->kern->protocol,
.open = transport->user->open,
.close = transport->user->close,
.remove = transport->user->remove,
.read = transport->kern->read,
.write = transport->kern->write,
.add_address = transport->user->add_address,
.delete_address = transport->user->delete_address,
.set_mtu = transport->user->set_mtu,
.user = { save } });
init_timer(&lp->tl);
spin_lock_init(&lp->lock);
lp->tl.function = uml_net_user_timer_expire;
memcpy(lp->mac, device->mac, sizeof(lp->mac));
if (transport->user->init)
(*transport->user->init)(&lp->user, dev);
set_ether_mac(dev, device->mac);
return 0;
}
static struct uml_net *find_device(int n)
{
struct uml_net *device;
struct list_head *ele;
spin_lock(&devices_lock);
list_for_each(ele, &devices){
device = list_entry(ele, struct uml_net, list);
if(device->index == n)
goto out;
}
device = NULL;
out:
spin_unlock(&devices_lock);
return(device);
}
static int eth_parse(char *str, int *index_out, char **str_out)
{
char *end;
int n;
n = simple_strtoul(str, &end, 0);
if(end == str){
printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str);
return(1);
}
if(n < 0){
printk(KERN_ERR "eth_setup: device %d is negative\n", n);
return(1);
}
str = end;
if(*str != '='){
printk(KERN_ERR
"eth_setup: expected '=' after device number\n");
return(1);
}
str++;
if(find_device(n)){
printk(KERN_ERR "eth_setup: Device %d already configured\n",
n);
return(1);
}
if(index_out) *index_out = n;
*str_out = str;
return(0);
}
struct eth_init {
struct list_head list;
char *init;
int index;
};
/* Filled in at boot time. Will need locking if the transports become
* modular.
*/
struct list_head transports = LIST_HEAD_INIT(transports);
/* Filled in during early boot */
struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
static int check_transport(struct transport *transport, char *eth, int n,
void **init_out, char **mac_out)
{
int len;
len = strlen(transport->name);
if(strncmp(eth, transport->name, len))
return(0);
eth += len;
if(*eth == ',')
eth++;
else if(*eth != '\0')
return(0);
*init_out = kmalloc(transport->setup_size, GFP_KERNEL);
if(*init_out == NULL)
return(1);
if(!transport->setup(eth, mac_out, *init_out)){
kfree(*init_out);
*init_out = NULL;
}
return(1);
}
void register_transport(struct transport *new)
{
struct list_head *ele, *next;
struct eth_init *eth;
void *init;
char *mac = NULL;
int match;
list_add(&new->list, &transports);
list_for_each_safe(ele, next, &eth_cmd_line){
eth = list_entry(ele, struct eth_init, list);
match = check_transport(new, eth->init, eth->index, &init,
&mac);
if(!match)
continue;
else if(init != NULL){
eth_configure(eth->index, init, mac, new);
kfree(init);
}
list_del(&eth->list);
}
}
static int eth_setup_common(char *str, int index)
{
struct list_head *ele;
struct transport *transport;
void *init;
char *mac = NULL;
list_for_each(ele, &transports){
transport = list_entry(ele, struct transport, list);
if(!check_transport(transport, str, index, &init, &mac))
continue;
if(init != NULL){
eth_configure(index, init, mac, transport);
kfree(init);
}
return(1);
}
return(0);
}
static int eth_setup(char *str)
{
struct eth_init *new;
int n, err;
err = eth_parse(str, &n, &str);
if(err)
return 1;
new = alloc_bootmem(sizeof(*new));
if (new == NULL){
printk("eth_init : alloc_bootmem failed\n");
return 1;
}
INIT_LIST_HEAD(&new->list);
new->index = n;
new->init = str;
list_add_tail(&new->list, &eth_cmd_line);
return 1;
}
__setup("eth", eth_setup);
__uml_help(eth_setup,
"eth[0-9]+=<transport>,<options>\n"
" Configure a network device.\n\n"
);
#if 0
static int eth_init(void)
{
struct list_head *ele, *next;
struct eth_init *eth;
list_for_each_safe(ele, next, &eth_cmd_line){
eth = list_entry(ele, struct eth_init, list);
if(eth_setup_common(eth->init, eth->index))
list_del(&eth->list);
}
return(1);
}
__initcall(eth_init);
#endif
static int net_config(char *str)
{
int n, err;
err = eth_parse(str, &n, &str);
if(err) return(err);
str = kstrdup(str, GFP_KERNEL);
if(str == NULL){
printk(KERN_ERR "net_config failed to strdup string\n");
return(-1);
}
err = !eth_setup_common(str, n);
if(err)
kfree(str);
return(err);
}
static int net_id(char **str, int *start_out, int *end_out)
{
char *end;
int n;
n = simple_strtoul(*str, &end, 0);
if((*end != '\0') || (end == *str))
return -1;
*start_out = n;
*end_out = n;
*str = end;
return n;
}
static int net_remove(int n)
{
struct uml_net *device;
struct net_device *dev;
struct uml_net_private *lp;
device = find_device(n);
if(device == NULL)
return -ENODEV;
dev = device->dev;
lp = dev->priv;
if(lp->fd > 0)
return -EBUSY;
if(lp->remove != NULL) (*lp->remove)(&lp->user);
unregister_netdev(dev);
platform_device_unregister(&device->pdev);
list_del(&device->list);
kfree(device);
free_netdev(dev);
return 0;
}
static struct mc_device net_mc = {
.name = "eth",
.config = net_config,
.get_config = NULL,
.id = net_id,
.remove = net_remove,
};
static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
void *ptr)
{
struct in_ifaddr *ifa = ptr;
struct net_device *dev = ifa->ifa_dev->dev;
struct uml_net_private *lp;
void (*proc)(unsigned char *, unsigned char *, void *);
unsigned char addr_buf[4], netmask_buf[4];
if(dev->open != uml_net_open) return(NOTIFY_DONE);
lp = dev->priv;
proc = NULL;
switch (event){
case NETDEV_UP:
proc = lp->add_address;
break;
case NETDEV_DOWN:
proc = lp->delete_address;
break;
}
if(proc != NULL){
memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
(*proc)(addr_buf, netmask_buf, &lp->user);
}
return(NOTIFY_DONE);
}
struct notifier_block uml_inetaddr_notifier = {
.notifier_call = uml_inetaddr_event,
};
static int uml_net_init(void)
{
struct list_head *ele;
struct uml_net_private *lp;
struct in_device *ip;
struct in_ifaddr *in;
mconsole_register_dev(&net_mc);
register_inetaddr_notifier(&uml_inetaddr_notifier);
/* Devices may have been opened already, so the uml_inetaddr_notifier
* didn't get a chance to run for them. This fakes it so that
* addresses which have already been set up get handled properly.
*/
list_for_each(ele, &opened){
lp = list_entry(ele, struct uml_net_private, list);
ip = lp->dev->ip_ptr;
if(ip == NULL) continue;
in = ip->ifa_list;
while(in != NULL){
uml_inetaddr_event(NULL, NETDEV_UP, in);
in = in->ifa_next;
}
}
return(0);
}
__initcall(uml_net_init);
static void close_devices(void)
{
struct list_head *ele;
struct uml_net_private *lp;
list_for_each(ele, &opened){
lp = list_entry(ele, struct uml_net_private, list);
free_irq(lp->dev->irq, lp->dev);
if((lp->close != NULL) && (lp->fd >= 0))
(*lp->close)(lp->fd, &lp->user);
if(lp->remove != NULL) (*lp->remove)(&lp->user);
}
}
__uml_exitcall(close_devices);
struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
{
if((skb != NULL) && (skb_tailroom(skb) < extra)){
struct sk_buff *skb2;
skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
dev_kfree_skb(skb);
skb = skb2;
}
if(skb != NULL) skb_put(skb, extra);
return(skb);
}
void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
void *),
void *arg)
{
struct net_device *dev = d;
struct in_device *ip = dev->ip_ptr;
struct in_ifaddr *in;
unsigned char address[4], netmask[4];
if(ip == NULL) return;
in = ip->ifa_list;
while(in != NULL){
memcpy(address, &in->ifa_address, sizeof(address));
memcpy(netmask, &in->ifa_mask, sizeof(netmask));
(*cb)(address, netmask, arg);
in = in->ifa_next;
}
}
int dev_netmask(void *d, void *m)
{
struct net_device *dev = d;
struct in_device *ip = dev->ip_ptr;
struct in_ifaddr *in;
__be32 *mask_out = m;
if(ip == NULL)
return(1);
in = ip->ifa_list;
if(in == NULL)
return(1);
*mask_out = in->ifa_mask;
return(0);
}
void *get_output_buffer(int *len_out)
{
void *ret;
ret = (void *) __get_free_pages(GFP_KERNEL, 0);
if(ret) *len_out = PAGE_SIZE;
else *len_out = 0;
return(ret);
}
void free_output_buffer(void *buffer)
{
free_pages((unsigned long) buffer, 0);
}
int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
char **gate_addr)
{
char *remain;
remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
if(remain != NULL){
printk("tap_setup_common - Extra garbage on specification : "
"'%s'\n", remain);
return(1);
}
return(0);
}
unsigned short eth_protocol(struct sk_buff *skb)
{
return(eth_type_trans(skb, skb->dev));
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/
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