#include <linux/kmod.h>
#include <linux/init.h>
#include <linux/list.h>
+#include <linux/idr.h>
#include <linux/netdevice.h>
#include <linux/poll.h>
#include <linux/ppp_defs.h>
#include <linux/if_arp.h>
#include <linux/ip.h>
#include <linux/tcp.h>
+#include <linux/smp_lock.h>
#include <linux/spinlock.h>
#include <linux/rwsem.h>
#include <linux/stddef.h>
unsigned long last_xmit; /* jiffies when last pkt sent 9c */
unsigned long last_recv; /* jiffies when last pkt rcvd a0 */
struct net_device *dev; /* network interface device a4 */
+ int closing; /* is device closing down? a8 */
#ifdef CONFIG_PPP_MULTILINK
int nxchan; /* next channel to send something on */
u32 nxseq; /* next sequence number to send */
*/
/*
- * A cardmap represents a mapping from unsigned integers to pointers,
- * and provides a fast "find lowest unused number" operation.
- * It uses a broad (32-way) tree with a bitmap at each level.
- * It is designed to be space-efficient for small numbers of entries
- * and time-efficient for large numbers of entries.
- */
-#define CARDMAP_ORDER 5
-#define CARDMAP_WIDTH (1U << CARDMAP_ORDER)
-#define CARDMAP_MASK (CARDMAP_WIDTH - 1)
-
-struct cardmap {
- int shift;
- unsigned long inuse;
- struct cardmap *parent;
- void *ptr[CARDMAP_WIDTH];
-};
-static void *cardmap_get(struct cardmap *map, unsigned int nr);
-static int cardmap_set(struct cardmap **map, unsigned int nr, void *ptr);
-static unsigned int cardmap_find_first_free(struct cardmap *map);
-static void cardmap_destroy(struct cardmap **map);
-
-/*
* all_ppp_mutex protects the all_ppp_units mapping.
* It also ensures that finding a ppp unit in the all_ppp_units map
* and updating its file.refcnt field is atomic.
*/
static DEFINE_MUTEX(all_ppp_mutex);
-static struct cardmap *all_ppp_units;
static atomic_t ppp_unit_count = ATOMIC_INIT(0);
+static DEFINE_IDR(ppp_units_idr);
/*
* all_channels_lock protects all_channels and last_channel_index,
static int ppp_connect_channel(struct channel *pch, int unit);
static int ppp_disconnect_channel(struct channel *pch);
static void ppp_destroy_channel(struct channel *pch);
+static int unit_get(struct idr *p, void *ptr);
+static int unit_set(struct idr *p, void *ptr, int n);
+static void unit_put(struct idr *p, int n);
+static void *unit_find(struct idr *p, int n);
static struct class *ppp_class;
*/
static int ppp_open(struct inode *inode, struct file *file)
{
+ cycle_kernel_lock();
/*
* This could (should?) be enforced by the permissions on /dev/ppp.
*/
return 0;
}
-static int ppp_release(struct inode *inode, struct file *file)
+static int ppp_release(struct inode *unused, struct file *file)
{
struct ppp_file *pf = file->private_data;
struct ppp *ppp;
}
#endif /* CONFIG_PPP_FILTER */
-static int ppp_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
+static long ppp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct ppp_file *pf = file->private_data;
struct ppp *ppp;
* this fd and reopening /dev/ppp.
*/
err = -EINVAL;
+ lock_kernel();
if (pf->kind == INTERFACE) {
ppp = PF_TO_PPP(pf);
if (file == ppp->owner)
ppp_shutdown_interface(ppp);
}
- if (atomic_read(&file->f_count) <= 2) {
- ppp_release(inode, file);
+ if (atomic_long_read(&file->f_count) <= 2) {
+ ppp_release(NULL, file);
err = 0;
} else
- printk(KERN_DEBUG "PPPIOCDETACH file->f_count=%d\n",
- atomic_read(&file->f_count));
+ printk(KERN_DEBUG "PPPIOCDETACH file->f_count=%ld\n",
+ atomic_long_read(&file->f_count));
+ unlock_kernel();
return err;
}
if (pf->kind == CHANNEL) {
- struct channel *pch = PF_TO_CHANNEL(pf);
+ struct channel *pch;
struct ppp_channel *chan;
+ lock_kernel();
+ pch = PF_TO_CHANNEL(pf);
+
switch (cmd) {
case PPPIOCCONNECT:
if (get_user(unit, p))
err = chan->ops->ioctl(chan, cmd, arg);
up_read(&pch->chan_sem);
}
+ unlock_kernel();
return err;
}
return -EINVAL;
}
+ lock_kernel();
ppp = PF_TO_PPP(pf);
switch (cmd) {
case PPPIOCSMRU:
default:
err = -ENOTTY;
}
-
+ unlock_kernel();
return err;
}
struct channel *chan;
int __user *p = (int __user *)arg;
+ lock_kernel();
switch (cmd) {
case PPPIOCNEWUNIT:
/* Create a new ppp unit */
default:
err = -ENOTTY;
}
+ unlock_kernel();
return err;
}
.read = ppp_read,
.write = ppp_write,
.poll = ppp_poll,
- .ioctl = ppp_ioctl,
+ .unlocked_ioctl = ppp_ioctl,
.open = ppp_open,
.release = ppp_release
};
err = PTR_ERR(ppp_class);
goto out_chrdev;
}
- device_create(ppp_class, NULL, MKDEV(PPP_MAJOR, 0), "ppp");
+ device_create(ppp_class, NULL, MKDEV(PPP_MAJOR, 0), NULL,
+ "ppp");
}
out:
static int
ppp_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
- struct ppp *ppp = (struct ppp *) dev->priv;
+ struct ppp *ppp = netdev_priv(dev);
int npi, proto;
unsigned char *pp;
static int
ppp_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
- struct ppp *ppp = dev->priv;
+ struct ppp *ppp = netdev_priv(dev);
int err = -EFAULT;
void __user *addr = (void __user *) ifr->ifr_ifru.ifru_data;
struct ppp_stats stats;
return err;
}
+static const struct net_device_ops ppp_netdev_ops = {
+ .ndo_start_xmit = ppp_start_xmit,
+ .ndo_do_ioctl = ppp_net_ioctl,
+};
+
static void ppp_setup(struct net_device *dev)
{
+ dev->netdev_ops = &ppp_netdev_ops;
dev->hard_header_len = PPP_HDRLEN;
dev->mtu = PPP_MTU;
dev->addr_len = 0;
struct sk_buff *skb;
ppp_xmit_lock(ppp);
- if (ppp->dev) {
+ if (!ppp->closing) {
ppp_push(ppp);
while (!ppp->xmit_pending
&& (skb = skb_dequeue(&ppp->file.xq)))
ppp_do_recv(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
{
ppp_recv_lock(ppp);
- /* ppp->dev == 0 means interface is closing down */
- if (ppp->dev)
+ if (!ppp->closing)
ppp_receive_frame(ppp, skb, pch);
else
kfree_skb(skb);
skb->protocol = htons(npindex_to_ethertype[npi]);
skb_reset_mac_header(skb);
netif_rx(skb);
- ppp->dev->last_rx = jiffies;
}
}
return;
/* If the queue is getting long, don't wait any longer for packets
before the start of the queue. */
- if (skb_queue_len(&ppp->mrq) >= PPP_MP_MAX_QLEN
- && seq_before(ppp->minseq, ppp->mrq.next->sequence))
- ppp->minseq = ppp->mrq.next->sequence;
+ if (skb_queue_len(&ppp->mrq) >= PPP_MP_MAX_QLEN) {
+ struct sk_buff *skb = skb_peek(&ppp->mrq);
+ if (seq_before(ppp->minseq, skb->sequence))
+ ppp->minseq = skb->sequence;
+ }
/* Pull completed packets off the queue and receive them. */
while ((skb = ppp_mp_reconstruct(ppp)))
/* N.B. we don't need to lock the list lock because we have the
ppp unit receive-side lock. */
- for (p = list->next; p != (struct sk_buff *)list; p = p->next)
+ skb_queue_walk(list, p) {
if (seq_before(seq, p->sequence))
break;
- __skb_insert(skb, p->prev, p, list);
+ }
+ __skb_queue_before(list, p, skb);
}
/*
|| ccp_option[1] < 2 || ccp_option[1] > data.length)
goto out;
- cp = find_compressor(ccp_option[0]);
-#ifdef CONFIG_KMOD
- if (!cp) {
- request_module("ppp-compress-%d", ccp_option[0]);
- cp = find_compressor(ccp_option[0]);
- }
-#endif /* CONFIG_KMOD */
+ cp = try_then_request_module(
+ find_compressor(ccp_option[0]),
+ "ppp-compress-%d", ccp_option[0]);
if (!cp)
goto out;
int ret = -ENOMEM;
int i;
- ppp = kzalloc(sizeof(struct ppp), GFP_KERNEL);
- if (!ppp)
- goto out;
- dev = alloc_netdev(0, "", ppp_setup);
+ dev = alloc_netdev(sizeof(struct ppp), "", ppp_setup);
if (!dev)
goto out1;
+ ppp = netdev_priv(dev);
+ ppp->dev = dev;
ppp->mru = PPP_MRU;
init_ppp_file(&ppp->file, INTERFACE);
ppp->file.hdrlen = PPP_HDRLEN - 2; /* don't count proto bytes */
ppp->minseq = -1;
skb_queue_head_init(&ppp->mrq);
#endif /* CONFIG_PPP_MULTILINK */
- ppp->dev = dev;
- dev->priv = ppp;
-
- dev->hard_start_xmit = ppp_start_xmit;
- dev->do_ioctl = ppp_net_ioctl;
ret = -EEXIST;
mutex_lock(&all_ppp_mutex);
- if (unit < 0)
- unit = cardmap_find_first_free(all_ppp_units);
- else if (cardmap_get(all_ppp_units, unit) != NULL)
- goto out2; /* unit already exists */
+
+ if (unit < 0) {
+ unit = unit_get(&ppp_units_idr, ppp);
+ if (unit < 0) {
+ *retp = unit;
+ goto out2;
+ }
+ } else {
+ if (unit_find(&ppp_units_idr, unit))
+ goto out2; /* unit already exists */
+ /*
+ * if caller need a specified unit number
+ * lets try to satisfy him, otherwise --
+ * he should better ask us for new unit number
+ *
+ * NOTE: yes I know that returning EEXIST it's not
+ * fair but at least pppd will ask us to allocate
+ * new unit in this case so user is happy :)
+ */
+ unit = unit_set(&ppp_units_idr, ppp, unit);
+ if (unit < 0)
+ goto out2;
+ }
/* Initialize the new ppp unit */
ppp->file.index = unit;
ret = register_netdev(dev);
if (ret != 0) {
+ unit_put(&ppp_units_idr, unit);
printk(KERN_ERR "PPP: couldn't register device %s (%d)\n",
dev->name, ret);
goto out2;
}
atomic_inc(&ppp_unit_count);
- ret = cardmap_set(&all_ppp_units, unit, ppp);
- if (ret != 0)
- goto out3;
-
mutex_unlock(&all_ppp_mutex);
+
*retp = 0;
return ppp;
-out3:
- atomic_dec(&ppp_unit_count);
- unregister_netdev(dev);
out2:
mutex_unlock(&all_ppp_mutex);
free_netdev(dev);
out1:
- kfree(ppp);
-out:
*retp = ret;
return NULL;
}
*/
static void ppp_shutdown_interface(struct ppp *ppp)
{
- struct net_device *dev;
-
mutex_lock(&all_ppp_mutex);
- ppp_lock(ppp);
- dev = ppp->dev;
- ppp->dev = NULL;
- ppp_unlock(ppp);
/* This will call dev_close() for us. */
- if (dev) {
- unregister_netdev(dev);
- free_netdev(dev);
- }
- cardmap_set(&all_ppp_units, ppp->file.index, NULL);
+ ppp_lock(ppp);
+ if (!ppp->closing) {
+ ppp->closing = 1;
+ ppp_unlock(ppp);
+ unregister_netdev(ppp->dev);
+ } else
+ ppp_unlock(ppp);
+
+ unit_put(&ppp_units_idr, ppp->file.index);
ppp->file.dead = 1;
ppp->owner = NULL;
wake_up_interruptible(&ppp->file.rwait);
if (ppp->xmit_pending)
kfree_skb(ppp->xmit_pending);
- kfree(ppp);
+ free_netdev(ppp->dev);
}
/*
static struct ppp *
ppp_find_unit(int unit)
{
- return cardmap_get(all_ppp_units, unit);
+ return unit_find(&ppp_units_idr, unit);
}
/*
if (pch->file.hdrlen > ppp->file.hdrlen)
ppp->file.hdrlen = pch->file.hdrlen;
hdrlen = pch->file.hdrlen + 2; /* for protocol bytes */
- if (ppp->dev && hdrlen > ppp->dev->hard_header_len)
+ if (hdrlen > ppp->dev->hard_header_len)
ppp->dev->hard_header_len = hdrlen;
list_add_tail(&pch->clist, &ppp->channels);
++ppp->n_channels;
/* should never happen */
if (atomic_read(&ppp_unit_count) || atomic_read(&channel_count))
printk(KERN_ERR "PPP: removing module but units remain!\n");
- cardmap_destroy(&all_ppp_units);
unregister_chrdev(PPP_MAJOR, "ppp");
device_destroy(ppp_class, MKDEV(PPP_MAJOR, 0));
class_destroy(ppp_class);
+ idr_destroy(&ppp_units_idr);
}
/*
- * Cardmap implementation.
+ * Units handling. Caller must protect concurrent access
+ * by holding all_ppp_mutex
*/
-static void *cardmap_get(struct cardmap *map, unsigned int nr)
+
+/* associate pointer with specified number */
+static int unit_set(struct idr *p, void *ptr, int n)
{
- struct cardmap *p;
- int i;
+ int unit, err;
- for (p = map; p != NULL; ) {
- if ((i = nr >> p->shift) >= CARDMAP_WIDTH)
- return NULL;
- if (p->shift == 0)
- return p->ptr[i];
- nr &= ~(CARDMAP_MASK << p->shift);
- p = p->ptr[i];
+again:
+ if (!idr_pre_get(p, GFP_KERNEL)) {
+ printk(KERN_ERR "PPP: No free memory for idr\n");
+ return -ENOMEM;
}
- return NULL;
-}
-static int cardmap_set(struct cardmap **pmap, unsigned int nr, void *ptr)
-{
- struct cardmap *p;
- int i;
+ err = idr_get_new_above(p, ptr, n, &unit);
+ if (err == -EAGAIN)
+ goto again;
- p = *pmap;
- if (p == NULL || (nr >> p->shift) >= CARDMAP_WIDTH) {
- do {
- /* need a new top level */
- struct cardmap *np = kzalloc(sizeof(*np), GFP_KERNEL);
- if (!np)
- goto enomem;
- np->ptr[0] = p;
- if (p != NULL) {
- np->shift = p->shift + CARDMAP_ORDER;
- p->parent = np;
- } else
- np->shift = 0;
- p = np;
- } while ((nr >> p->shift) >= CARDMAP_WIDTH);
- *pmap = p;
- }
- while (p->shift > 0) {
- i = (nr >> p->shift) & CARDMAP_MASK;
- if (p->ptr[i] == NULL) {
- struct cardmap *np = kzalloc(sizeof(*np), GFP_KERNEL);
- if (!np)
- goto enomem;
- np->shift = p->shift - CARDMAP_ORDER;
- np->parent = p;
- p->ptr[i] = np;
- }
- if (ptr == NULL)
- clear_bit(i, &p->inuse);
- p = p->ptr[i];
- }
- i = nr & CARDMAP_MASK;
- p->ptr[i] = ptr;
- if (ptr != NULL)
- set_bit(i, &p->inuse);
- else
- clear_bit(i, &p->inuse);
- return 0;
- enomem:
- return -ENOMEM;
+ if (unit != n) {
+ idr_remove(p, unit);
+ return -EINVAL;
+ }
+
+ return unit;
}
-static unsigned int cardmap_find_first_free(struct cardmap *map)
+/* get new free unit number and associate pointer with it */
+static int unit_get(struct idr *p, void *ptr)
{
- struct cardmap *p;
- unsigned int nr = 0;
- int i;
+ int unit, err;
- if ((p = map) == NULL)
- return 0;
- for (;;) {
- i = find_first_zero_bit(&p->inuse, CARDMAP_WIDTH);
- if (i >= CARDMAP_WIDTH) {
- if (p->parent == NULL)
- return CARDMAP_WIDTH << p->shift;
- p = p->parent;
- i = (nr >> p->shift) & CARDMAP_MASK;
- set_bit(i, &p->inuse);
- continue;
- }
- nr = (nr & (~CARDMAP_MASK << p->shift)) | (i << p->shift);
- if (p->shift == 0 || p->ptr[i] == NULL)
- return nr;
- p = p->ptr[i];
+again:
+ if (!idr_pre_get(p, GFP_KERNEL)) {
+ printk(KERN_ERR "PPP: No free memory for idr\n");
+ return -ENOMEM;
}
+
+ err = idr_get_new_above(p, ptr, 0, &unit);
+ if (err == -EAGAIN)
+ goto again;
+
+ return unit;
}
-static void cardmap_destroy(struct cardmap **pmap)
+/* put unit number back to a pool */
+static void unit_put(struct idr *p, int n)
{
- struct cardmap *p, *np;
- int i;
+ idr_remove(p, n);
+}
- for (p = *pmap; p != NULL; p = np) {
- if (p->shift != 0) {
- for (i = 0; i < CARDMAP_WIDTH; ++i)
- if (p->ptr[i] != NULL)
- break;
- if (i < CARDMAP_WIDTH) {
- np = p->ptr[i];
- p->ptr[i] = NULL;
- continue;
- }
- }
- np = p->parent;
- kfree(p);
- }
- *pmap = NULL;
+/* get pointer associated with the number */
+static void *unit_find(struct idr *p, int n)
+{
+ return idr_find(p, n);
}
/* Module/initialization stuff */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff