#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/stddef.h>
#include <linux/device.h>
#include <linux/mutex.h>
+#include <linux/slab.h>
#include <net/slhc_vj.h>
#include <asm/atomic.h>
+#include <linux/nsproxy.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+
#define PPP_VERSION "2.4.2"
/*
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 */
struct sock_filter *active_filter;/* filter for pkts to reset idle */
unsigned pass_len, active_len;
#endif /* CONFIG_PPP_FILTER */
+ struct net *ppp_net; /* the net we belong to */
};
/*
struct rw_semaphore chan_sem; /* protects `chan' during chan ioctl */
spinlock_t downl; /* protects `chan', file.xq dequeue */
struct ppp *ppp; /* ppp unit we're connected to */
+ struct net *chan_net; /* the net channel belongs to */
struct list_head clist; /* link in list of channels per unit */
rwlock_t upl; /* protects `ppp' */
#ifdef CONFIG_PPP_MULTILINK
u8 avail; /* flag used in multilink stuff */
u8 had_frag; /* >= 1 fragments have been sent */
u32 lastseq; /* MP: last sequence # received */
+ int speed; /* speed of the corresponding ppp channel*/
#endif /* CONFIG_PPP_MULTILINK */
};
* channel.downl.
*/
-/*
- * 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);
-
-/*
- * all_channels_lock protects all_channels and last_channel_index,
- * and the atomicity of find a channel and updating its file.refcnt
- * field.
- */
-static DEFINE_SPINLOCK(all_channels_lock);
-static LIST_HEAD(all_channels);
-static LIST_HEAD(new_channels);
-static int last_channel_index;
static atomic_t channel_count = ATOMIC_INIT(0);
+/* per-net private data for this module */
+static int ppp_net_id __read_mostly;
+struct ppp_net {
+ /* units to ppp mapping */
+ struct idr units_idr;
+
+ /*
+ * all_ppp_mutex protects the units_idr mapping.
+ * It also ensures that finding a ppp unit in the units_idr
+ * map and updating its file.refcnt field is atomic.
+ */
+ struct mutex all_ppp_mutex;
+
+ /* channels */
+ struct list_head all_channels;
+ struct list_head new_channels;
+ int last_channel_index;
+
+ /*
+ * all_channels_lock protects all_channels and
+ * last_channel_index, and the atomicity of find
+ * a channel and updating its file.refcnt field.
+ */
+ spinlock_t all_channels_lock;
+};
+
/* Get the PPP protocol number from a skb */
#define PPP_PROTO(skb) (((skb)->data[0] << 8) + (skb)->data[1])
#define seq_after(a, b) ((s32)((a) - (b)) > 0)
/* Prototypes. */
-static int ppp_unattached_ioctl(struct ppp_file *pf, struct file *file,
- unsigned int cmd, unsigned long arg);
+static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf,
+ struct file *file, unsigned int cmd, unsigned long arg);
static void ppp_xmit_process(struct ppp *ppp);
static void ppp_send_frame(struct ppp *ppp, struct sk_buff *skb);
static void ppp_push(struct ppp *ppp);
static void ppp_ccp_closed(struct ppp *ppp);
static struct compressor *find_compressor(int type);
static void ppp_get_stats(struct ppp *ppp, struct ppp_stats *st);
-static struct ppp *ppp_create_interface(int unit, int *retp);
+static struct ppp *ppp_create_interface(struct net *net, int unit, int *retp);
static void init_ppp_file(struct ppp_file *pf, int kind);
static void ppp_shutdown_interface(struct ppp *ppp);
static void ppp_destroy_interface(struct ppp *ppp);
-static struct ppp *ppp_find_unit(int unit);
-static struct channel *ppp_find_channel(int unit);
+static struct ppp *ppp_find_unit(struct ppp_net *pn, int unit);
+static struct channel *ppp_find_channel(struct ppp_net *pn, int unit);
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;
+/* per net-namespace data */
+static inline struct ppp_net *ppp_pernet(struct net *net)
+{
+ BUG_ON(!net);
+
+ return net_generic(net, ppp_net_id);
+}
+
/* Translates a PPP protocol number to a NP index (NP == network protocol) */
static inline int proto_to_npindex(int proto)
{
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;
DECLARE_WAITQUEUE(wait, current);
ssize_t ret;
struct sk_buff *skb = NULL;
+ struct iovec iov;
ret = count;
* network traffic (demand mode).
*/
struct ppp *ppp = PF_TO_PPP(pf);
- if (ppp->n_channels == 0
- && (ppp->flags & SC_LOOP_TRAFFIC) == 0)
+ if (ppp->n_channels == 0 &&
+ (ppp->flags & SC_LOOP_TRAFFIC) == 0)
break;
}
ret = -EAGAIN;
if (skb->len > count)
goto outf;
ret = -EFAULT;
- if (copy_to_user(buf, skb->data, skb->len))
+ iov.iov_base = buf;
+ iov.iov_len = count;
+ if (skb_copy_datagram_iovec(skb, 0, &iov, skb->len))
goto outf;
ret = skb->len;
else if (pf->kind == INTERFACE) {
/* see comment in ppp_read */
struct ppp *ppp = PF_TO_PPP(pf);
- if (ppp->n_channels == 0
- && (ppp->flags & SC_LOOP_TRAFFIC) == 0)
+ if (ppp->n_channels == 0 &&
+ (ppp->flags & SC_LOOP_TRAFFIC) == 0)
mask |= POLLIN | POLLRDNORM;
}
}
#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;
int __user *p = argp;
if (!pf)
- return ppp_unattached_ioctl(pf, file, cmd, arg);
+ return ppp_unattached_ioctl(current->nsproxy->net_ns,
+ pf, file, cmd, arg);
if (cmd == PPPIOCDETACH) {
/*
* 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;
}
-static int ppp_unattached_ioctl(struct ppp_file *pf, struct file *file,
- unsigned int cmd, unsigned long arg)
+static int ppp_unattached_ioctl(struct net *net, struct ppp_file *pf,
+ struct file *file, unsigned int cmd, unsigned long arg)
{
int unit, err = -EFAULT;
struct ppp *ppp;
struct channel *chan;
+ struct ppp_net *pn;
int __user *p = (int __user *)arg;
+ lock_kernel();
switch (cmd) {
case PPPIOCNEWUNIT:
/* Create a new ppp unit */
if (get_user(unit, p))
break;
- ppp = ppp_create_interface(unit, &err);
+ ppp = ppp_create_interface(net, unit, &err);
if (!ppp)
break;
file->private_data = &ppp->file;
/* Attach to an existing ppp unit */
if (get_user(unit, p))
break;
- mutex_lock(&all_ppp_mutex);
err = -ENXIO;
- ppp = ppp_find_unit(unit);
+ pn = ppp_pernet(net);
+ mutex_lock(&pn->all_ppp_mutex);
+ ppp = ppp_find_unit(pn, unit);
if (ppp) {
atomic_inc(&ppp->file.refcnt);
file->private_data = &ppp->file;
err = 0;
}
- mutex_unlock(&all_ppp_mutex);
+ mutex_unlock(&pn->all_ppp_mutex);
break;
case PPPIOCATTCHAN:
if (get_user(unit, p))
break;
- spin_lock_bh(&all_channels_lock);
err = -ENXIO;
- chan = ppp_find_channel(unit);
+ pn = ppp_pernet(net);
+ spin_lock_bh(&pn->all_channels_lock);
+ chan = ppp_find_channel(pn, unit);
if (chan) {
atomic_inc(&chan->file.refcnt);
file->private_data = &chan->file;
err = 0;
}
- spin_unlock_bh(&all_channels_lock);
+ spin_unlock_bh(&pn->all_channels_lock);
break;
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
};
+static __net_init int ppp_init_net(struct net *net)
+{
+ struct ppp_net *pn = net_generic(net, ppp_net_id);
+
+ idr_init(&pn->units_idr);
+ mutex_init(&pn->all_ppp_mutex);
+
+ INIT_LIST_HEAD(&pn->all_channels);
+ INIT_LIST_HEAD(&pn->new_channels);
+
+ spin_lock_init(&pn->all_channels_lock);
+
+ return 0;
+}
+
+static __net_exit void ppp_exit_net(struct net *net)
+{
+ struct ppp_net *pn = net_generic(net, ppp_net_id);
+
+ idr_destroy(&pn->units_idr);
+}
+
+static struct pernet_operations ppp_net_ops = {
+ .init = ppp_init_net,
+ .exit = ppp_exit_net,
+ .id = &ppp_net_id,
+ .size = sizeof(struct ppp_net),
+};
+
#define PPP_MAJOR 108
/* Called at boot time if ppp is compiled into the kernel,
int err;
printk(KERN_INFO "PPP generic driver version " PPP_VERSION "\n");
- err = register_chrdev(PPP_MAJOR, "ppp", &ppp_device_fops);
- if (!err) {
- ppp_class = class_create(THIS_MODULE, "ppp");
- if (IS_ERR(ppp_class)) {
- err = PTR_ERR(ppp_class);
- goto out_chrdev;
- }
- device_create(ppp_class, NULL, MKDEV(PPP_MAJOR, 0), "ppp");
+
+ err = register_pernet_device(&ppp_net_ops);
+ if (err) {
+ printk(KERN_ERR "failed to register PPP pernet device (%d)\n", err);
+ goto out;
}
-out:
- if (err)
+ err = register_chrdev(PPP_MAJOR, "ppp", &ppp_device_fops);
+ if (err) {
printk(KERN_ERR "failed to register PPP device (%d)\n", err);
- return err;
+ goto out_net;
+ }
+
+ ppp_class = class_create(THIS_MODULE, "ppp");
+ if (IS_ERR(ppp_class)) {
+ err = PTR_ERR(ppp_class);
+ goto out_chrdev;
+ }
+
+ /* not a big deal if we fail here :-) */
+ device_create(ppp_class, NULL, MKDEV(PPP_MAJOR, 0), NULL, "ppp");
+
+ return 0;
out_chrdev:
unregister_chrdev(PPP_MAJOR, "ppp");
- goto out;
+out_net:
+ unregister_pernet_device(&ppp_net_ops);
+out:
+ return err;
}
/*
* Network interface unit routines.
*/
-static int
+static netdev_tx_t
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;
netif_stop_queue(dev);
skb_queue_tail(&ppp->file.xq, skb);
ppp_xmit_process(ppp);
- return 0;
+ return NETDEV_TX_OK;
outf:
kfree_skb(skb);
- ++ppp->dev->stats.tx_dropped;
- return 0;
+ ++dev->stats.tx_dropped;
+ return NETDEV_TX_OK;
}
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;
dev->tx_queue_len = 3;
dev->type = ARPHRD_PPP;
dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
+ dev->features |= NETIF_F_NETNS_LOCAL;
+ dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
}
/*
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)))
+ while (!ppp->xmit_pending &&
+ (skb = skb_dequeue(&ppp->file.xq)))
ppp_send_frame(ppp, skb);
/* If there's no work left to do, tell the core net
code that we can accept some more. */
/* the filter instructions are constructed assuming
a four-byte PPP header on each packet */
*skb_push(skb, 2) = 1;
- if (ppp->pass_filter
- && sk_run_filter(skb, ppp->pass_filter,
- ppp->pass_len) == 0) {
+ if (ppp->pass_filter &&
+ sk_run_filter(skb, ppp->pass_filter,
+ ppp->pass_len) == 0) {
if (ppp->debug & 1)
printk(KERN_DEBUG "PPP: outbound frame not passed\n");
kfree_skb(skb);
return;
}
/* if this packet passes the active filter, record the time */
- if (!(ppp->active_filter
- && sk_run_filter(skb, ppp->active_filter,
- ppp->active_len) == 0))
+ if (!(ppp->active_filter &&
+ sk_run_filter(skb, ppp->active_filter,
+ ppp->active_len) == 0))
ppp->last_xmit = jiffies;
skb_pull(skb, 2);
#else
}
/* try to do packet compression */
- if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state
- && proto != PPP_LCP && proto != PPP_CCP) {
+ if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state &&
+ proto != PPP_LCP && proto != PPP_CCP) {
if (!(ppp->flags & SC_CCP_UP) && (ppp->flags & SC_MUST_COMP)) {
if (net_ratelimit())
printk(KERN_ERR "ppp: compression required but down - pkt dropped.\n");
return;
drop:
- if (skb)
- kfree_skb(skb);
+ kfree_skb(skb);
++ppp->dev->stats.tx_errors;
}
*/
static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb)
{
- int len, fragsize;
+ int len, totlen;
int i, bits, hdrlen, mtu;
int flen;
- int navail, nfree;
+ int navail, nfree, nzero;
int nbigger;
+ int totspeed;
+ int totfree;
unsigned char *p, *q;
struct list_head *list;
struct channel *pch;
struct sk_buff *frag;
struct ppp_channel *chan;
- nfree = 0; /* # channels which have no packet already queued */
- navail = 0; /* total # of usable channels (not deregistered) */
+ totspeed = 0; /*total bitrate of the bundle*/
+ nfree = 0; /* # channels which have no packet already queued */
+ navail = 0; /* total # of usable channels (not deregistered) */
+ nzero = 0; /* number of channels with zero speed associated*/
+ totfree = 0; /*total # of channels available and
+ *having no queued packets before
+ *starting the fragmentation*/
+
hdrlen = (ppp->flags & SC_MP_XSHORTSEQ)? MPHDRLEN_SSN: MPHDRLEN;
i = 0;
list_for_each_entry(pch, &ppp->channels, clist) {
navail += pch->avail = (pch->chan != NULL);
+ pch->speed = pch->chan->speed;
if (pch->avail) {
if (skb_queue_empty(&pch->file.xq) ||
- !pch->had_frag) {
- pch->avail = 2;
- ++nfree;
- }
+ !pch->had_frag) {
+ if (pch->speed == 0)
+ nzero++;
+ else
+ totspeed += pch->speed;
+
+ pch->avail = 2;
+ ++nfree;
+ ++totfree;
+ }
if (!pch->had_frag && i < ppp->nxchan)
ppp->nxchan = i;
}
++i;
}
-
/*
* Don't start sending this packet unless at least half of
* the channels are free. This gives much better TCP
* performance if we have a lot of channels.
*/
if (nfree == 0 || nfree < navail / 2)
- return 0; /* can't take now, leave it in xmit_pending */
+ return 0; /* can't take now, leave it in xmit_pending */
/* Do protocol field compression (XXX this should be optional) */
p = skb->data;
--len;
}
- /*
- * Decide on fragment size.
- * We create a fragment for each free channel regardless of
- * how small they are (i.e. even 0 length) in order to minimize
- * the time that it will take to detect when a channel drops
- * a fragment.
- */
- fragsize = len;
- if (nfree > 1)
- fragsize = DIV_ROUND_UP(fragsize, nfree);
- /* nbigger channels get fragsize bytes, the rest get fragsize-1,
- except if nbigger==0, then they all get fragsize. */
+ totlen = len;
nbigger = len % nfree;
/* skip to the channel after the one we last used
/* create a fragment for each channel */
bits = B;
- while (nfree > 0 || len > 0) {
+ while (len > 0) {
list = list->next;
if (list == &ppp->channels) {
i = 0;
if (nfree > 0)
continue;
} else {
- --nfree;
pch->avail = 1;
}
spin_lock_bh(&pch->downl);
if (pch->chan == NULL) {
/* can't use this channel, it's being deregistered */
+ if (pch->speed == 0)
+ nzero--;
+ else
+ totspeed -= pch->speed;
+
spin_unlock_bh(&pch->downl);
pch->avail = 0;
+ totlen = len;
+ totfree--;
+ nfree--;
if (--navail == 0)
break;
continue;
}
/*
- * Create a fragment for this channel of
- * min(max(mtu+2-hdrlen, 4), fragsize, len) bytes.
- * If mtu+2-hdrlen < 4, that is a ridiculously small
- * MTU, so we use mtu = 2 + hdrlen.
+ *if the channel speed is not set divide
+ *the packet evenly among the free channels;
+ *otherwise divide it according to the speed
+ *of the channel we are going to transmit on
+ */
+ flen = len;
+ if (nfree > 0) {
+ if (pch->speed == 0) {
+ flen = len/nfree;
+ if (nbigger > 0) {
+ flen++;
+ nbigger--;
+ }
+ } else {
+ flen = (((totfree - nzero)*(totlen + hdrlen*totfree)) /
+ ((totspeed*totfree)/pch->speed)) - hdrlen;
+ if (nbigger > 0) {
+ flen += ((totfree - nzero)*pch->speed)/totspeed;
+ nbigger -= ((totfree - nzero)*pch->speed)/
+ totspeed;
+ }
+ }
+ nfree--;
+ }
+
+ /*
+ *check if we are on the last channel or
+ *we exceded the lenght of the data to
+ *fragment
+ */
+ if ((nfree <= 0) || (flen > len))
+ flen = len;
+ /*
+ *it is not worth to tx on slow channels:
+ *in that case from the resulting flen according to the
+ *above formula will be equal or less than zero.
+ *Skip the channel in this case
*/
- if (fragsize > len)
- fragsize = len;
- flen = fragsize;
- mtu = pch->chan->mtu + 2 - hdrlen;
+ if (flen <= 0) {
+ pch->avail = 2;
+ spin_unlock_bh(&pch->downl);
+ continue;
+ }
+
+ mtu = pch->chan->mtu - hdrlen;
if (mtu < 4)
mtu = 4;
if (flen > mtu)
flen = mtu;
- if (flen == len && nfree == 0)
+ if (flen == len)
bits |= E;
frag = alloc_skb(flen + hdrlen + (flen == 0), GFP_ATOMIC);
if (!frag)
q[5] = ppp->nxseq;
}
- /*
- * Copy the data in.
- * Unfortunately there is a bug in older versions of
- * the Linux PPP multilink reconstruction code where it
- * drops 0-length fragments. Therefore we make sure the
- * fragment has at least one byte of data. Any bytes
- * we add in this situation will end up as padding on the
- * end of the reconstructed packet.
- */
- if (flen == 0)
- *skb_put(frag, 1) = 0;
- else
- memcpy(q + hdrlen, p, flen);
+ memcpy(q + hdrlen, p, flen);
/* try to send it down the channel */
chan = pch->chan;
if (!skb_queue_empty(&pch->file.xq) ||
- !chan->ops->start_xmit(chan, frag))
+ !chan->ops->start_xmit(chan, frag))
skb_queue_tail(&pch->file.xq, frag);
pch->had_frag = 1;
p += flen;
++ppp->nxseq;
bits = 0;
spin_unlock_bh(&pch->downl);
-
- if (--nbigger == 0 && fragsize > 0)
- --fragsize;
}
ppp->nxchan = i;
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);
struct channel *pch = chan->ppp;
int proto;
- if (!pch || skb->len == 0) {
+ if (!pch) {
kfree_skb(skb);
return;
}
- proto = PPP_PROTO(skb);
read_lock_bh(&pch->upl);
+ if (!pskb_may_pull(skb, 2)) {
+ kfree_skb(skb);
+ if (pch->ppp) {
+ ++pch->ppp->dev->stats.rx_length_errors;
+ ppp_receive_error(pch->ppp);
+ }
+ goto done;
+ }
+
+ proto = PPP_PROTO(skb);
if (!pch->ppp || proto >= 0xc000 || proto == PPP_CCPFRAG) {
/* put it on the channel queue */
skb_queue_tail(&pch->file.rq, skb);
/* drop old frames if queue too long */
- while (pch->file.rq.qlen > PPP_MAX_RQLEN
- && (skb = skb_dequeue(&pch->file.rq)))
+ while (pch->file.rq.qlen > PPP_MAX_RQLEN &&
+ (skb = skb_dequeue(&pch->file.rq)))
kfree_skb(skb);
wake_up_interruptible(&pch->file.rwait);
} else {
ppp_do_recv(pch->ppp, skb, pch);
}
+
+done:
read_unlock_bh(&pch->upl);
}
static void
ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb, struct channel *pch)
{
- if (pskb_may_pull(skb, 2)) {
+ /* note: a 0-length skb is used as an error indication */
+ if (skb->len > 0) {
#ifdef CONFIG_PPP_MULTILINK
/* XXX do channel-level decompression here */
if (PPP_PROTO(skb) == PPP_MP)
else
#endif /* CONFIG_PPP_MULTILINK */
ppp_receive_nonmp_frame(ppp, skb);
- return;
+ } else {
+ kfree_skb(skb);
+ ppp_receive_error(ppp);
}
-
- if (skb->len > 0)
- /* note: a 0-length skb is used as an error indication */
- ++ppp->dev->stats.rx_length_errors;
-
- kfree_skb(skb);
- ppp_receive_error(ppp);
}
static void
* Note that some decompressors need to see uncompressed frames
* that come in as well as compressed frames.
*/
- if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN)
- && (ppp->rstate & (SC_DC_FERROR | SC_DC_ERROR)) == 0)
+ if (ppp->rc_state && (ppp->rstate & SC_DECOMP_RUN) &&
+ (ppp->rstate & (SC_DC_FERROR | SC_DC_ERROR)) == 0)
skb = ppp_decompress_frame(ppp, skb);
if (ppp->flags & SC_MUST_COMP && ppp->rstate & SC_DC_FERROR)
/* control or unknown frame - pass it to pppd */
skb_queue_tail(&ppp->file.rq, skb);
/* limit queue length by dropping old frames */
- while (ppp->file.rq.qlen > PPP_MAX_RQLEN
- && (skb = skb_dequeue(&ppp->file.rq)))
+ while (ppp->file.rq.qlen > PPP_MAX_RQLEN &&
+ (skb = skb_dequeue(&ppp->file.rq)))
kfree_skb(skb);
/* wake up any process polling or blocking on read */
wake_up_interruptible(&ppp->file.rwait);
goto err;
*skb_push(skb, 2) = 0;
- if (ppp->pass_filter
- && sk_run_filter(skb, ppp->pass_filter,
- ppp->pass_len) == 0) {
+ if (ppp->pass_filter &&
+ sk_run_filter(skb, ppp->pass_filter,
+ ppp->pass_len) == 0) {
if (ppp->debug & 1)
printk(KERN_DEBUG "PPP: inbound frame "
"not passed\n");
kfree_skb(skb);
return;
}
- if (!(ppp->active_filter
- && sk_run_filter(skb, ppp->active_filter,
- ppp->active_len) == 0))
+ if (!(ppp->active_filter &&
+ sk_run_filter(skb, ppp->active_filter,
+ ppp->active_len) == 0))
ppp->last_recv = jiffies;
__skb_pull(skb, 2);
} else
#endif /* CONFIG_PPP_FILTER */
ppp->last_recv = jiffies;
- if ((ppp->dev->flags & IFF_UP) == 0
- || ppp->npmode[npi] != NPMODE_PASS) {
+ if ((ppp->dev->flags & IFF_UP) == 0 ||
+ ppp->npmode[npi] != NPMODE_PASS) {
kfree_skb(skb);
} else {
/* chop off protocol */
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)))
- ppp_receive_nonmp_frame(ppp, skb);
+ while ((skb = ppp_mp_reconstruct(ppp))) {
+ if (pskb_may_pull(skb, 2))
+ ppp_receive_nonmp_frame(ppp, skb);
+ else {
+ ++ppp->dev->stats.rx_length_errors;
+ kfree_skb(skb);
+ ppp_receive_error(ppp);
+ }
+ }
return;
/* 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);
}
/*
* Channel interface.
*/
-/*
- * Create a new, unattached ppp channel.
- */
-int
-ppp_register_channel(struct ppp_channel *chan)
+/* Create a new, unattached ppp channel. */
+int ppp_register_channel(struct ppp_channel *chan)
+{
+ return ppp_register_net_channel(current->nsproxy->net_ns, chan);
+}
+
+/* Create a new, unattached ppp channel for specified net. */
+int ppp_register_net_channel(struct net *net, struct ppp_channel *chan)
{
struct channel *pch;
+ struct ppp_net *pn;
pch = kzalloc(sizeof(struct channel), GFP_KERNEL);
if (!pch)
return -ENOMEM;
+
+ pn = ppp_pernet(net);
+
pch->ppp = NULL;
pch->chan = chan;
+ pch->chan_net = net;
chan->ppp = pch;
init_ppp_file(&pch->file, CHANNEL);
pch->file.hdrlen = chan->hdrlen;
init_rwsem(&pch->chan_sem);
spin_lock_init(&pch->downl);
rwlock_init(&pch->upl);
- spin_lock_bh(&all_channels_lock);
- pch->file.index = ++last_channel_index;
- list_add(&pch->list, &new_channels);
+
+ spin_lock_bh(&pn->all_channels_lock);
+ pch->file.index = ++pn->last_channel_index;
+ list_add(&pch->list, &pn->new_channels);
atomic_inc(&channel_count);
- spin_unlock_bh(&all_channels_lock);
+ spin_unlock_bh(&pn->all_channels_lock);
+
return 0;
}
}
/*
+ * Return the PPP device interface name of a channel.
+ */
+char *ppp_dev_name(struct ppp_channel *chan)
+{
+ struct channel *pch = chan->ppp;
+ char *name = NULL;
+
+ if (pch) {
+ read_lock_bh(&pch->upl);
+ if (pch->ppp && pch->ppp->dev)
+ name = pch->ppp->dev->name;
+ read_unlock_bh(&pch->upl);
+ }
+ return name;
+}
+
+
+/*
* Disconnect a channel from the generic layer.
* This must be called in process context.
*/
ppp_unregister_channel(struct ppp_channel *chan)
{
struct channel *pch = chan->ppp;
+ struct ppp_net *pn;
if (!pch)
return; /* should never happen */
+
chan->ppp = NULL;
/*
spin_unlock_bh(&pch->downl);
up_write(&pch->chan_sem);
ppp_disconnect_channel(pch);
- spin_lock_bh(&all_channels_lock);
+
+ pn = ppp_pernet(pch->chan_net);
+ spin_lock_bh(&pn->all_channels_lock);
list_del(&pch->list);
- spin_unlock_bh(&all_channels_lock);
+ spin_unlock_bh(&pn->all_channels_lock);
+
pch->file.dead = 1;
wake_up_interruptible(&pch->file.rwait);
if (atomic_dec_and_test(&pch->file.refcnt))
unsigned char ccp_option[CCP_MAX_OPTION_LENGTH];
err = -EFAULT;
- if (copy_from_user(&data, (void __user *) arg, sizeof(data))
- || (data.length <= CCP_MAX_OPTION_LENGTH
- && copy_from_user(ccp_option, (void __user *) data.ptr, data.length)))
+ if (copy_from_user(&data, (void __user *) arg, sizeof(data)) ||
+ (data.length <= CCP_MAX_OPTION_LENGTH &&
+ copy_from_user(ccp_option, (void __user *) data.ptr, data.length)))
goto out;
err = -EINVAL;
- if (data.length > CCP_MAX_OPTION_LENGTH
- || ccp_option[1] < 2 || ccp_option[1] > data.length)
+ if (data.length > CCP_MAX_OPTION_LENGTH ||
+ 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;
* unit == -1 means allocate a new number.
*/
static struct ppp *
-ppp_create_interface(int unit, int *retp)
+ppp_create_interface(struct net *net, int unit, int *retp)
{
struct ppp *ppp;
+ struct ppp_net *pn;
struct net_device *dev = NULL;
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;
+ pn = ppp_pernet(net);
+
+ 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;
+ /*
+ * drum roll: don't forget to set
+ * the net device is belong to
+ */
+ dev_net_set(dev, net);
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 */
+ mutex_lock(&pn->all_ppp_mutex);
+
+ if (unit < 0) {
+ unit = unit_get(&pn->units_idr, ppp);
+ if (unit < 0) {
+ *retp = unit;
+ goto out2;
+ }
+ } else {
+ if (unit_find(&pn->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(&pn->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(&pn->units_idr, unit);
printk(KERN_ERR "PPP: couldn't register device %s (%d)\n",
dev->name, ret);
goto out2;
}
+ ppp->ppp_net = net;
+
atomic_inc(&ppp_unit_count);
- ret = cardmap_set(&all_ppp_units, unit, ppp);
- if (ret != 0)
- goto out3;
+ mutex_unlock(&pn->all_ppp_mutex);
- mutex_unlock(&all_ppp_mutex);
*retp = 0;
return ppp;
-out3:
- atomic_dec(&ppp_unit_count);
- unregister_netdev(dev);
out2:
- mutex_unlock(&all_ppp_mutex);
+ mutex_unlock(&pn->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;
+ struct ppp_net *pn;
+
+ pn = ppp_pernet(ppp->ppp_net);
+ mutex_lock(&pn->all_ppp_mutex);
- 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(&pn->units_idr, ppp->file.index);
ppp->file.dead = 1;
ppp->owner = NULL;
wake_up_interruptible(&ppp->file.rwait);
- mutex_unlock(&all_ppp_mutex);
+
+ mutex_unlock(&pn->all_ppp_mutex);
}
/*
ppp->active_filter = NULL;
#endif /* CONFIG_PPP_FILTER */
- if (ppp->xmit_pending)
- kfree_skb(ppp->xmit_pending);
+ kfree_skb(ppp->xmit_pending);
- kfree(ppp);
+ free_netdev(ppp->dev);
}
/*
* The caller should have locked the all_ppp_mutex.
*/
static struct ppp *
-ppp_find_unit(int unit)
+ppp_find_unit(struct ppp_net *pn, int unit)
{
- return cardmap_get(all_ppp_units, unit);
+ return unit_find(&pn->units_idr, unit);
}
/*
* when we have a lot of channels in use.
*/
static struct channel *
-ppp_find_channel(int unit)
+ppp_find_channel(struct ppp_net *pn, int unit)
{
struct channel *pch;
- list_for_each_entry(pch, &new_channels, list) {
+ list_for_each_entry(pch, &pn->new_channels, list) {
if (pch->file.index == unit) {
- list_move(&pch->list, &all_channels);
+ list_move(&pch->list, &pn->all_channels);
return pch;
}
}
- list_for_each_entry(pch, &all_channels, list) {
+
+ list_for_each_entry(pch, &pn->all_channels, list) {
if (pch->file.index == unit)
return pch;
}
+
return NULL;
}
ppp_connect_channel(struct channel *pch, int unit)
{
struct ppp *ppp;
+ struct ppp_net *pn;
int ret = -ENXIO;
int hdrlen;
- mutex_lock(&all_ppp_mutex);
- ppp = ppp_find_unit(unit);
+ pn = ppp_pernet(pch->chan_net);
+
+ mutex_lock(&pn->all_ppp_mutex);
+ ppp = ppp_find_unit(pn, unit);
if (!ppp)
goto out;
write_lock_bh(&pch->upl);
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;
outl:
write_unlock_bh(&pch->upl);
out:
- mutex_unlock(&all_ppp_mutex);
+ mutex_unlock(&pn->all_ppp_mutex);
return ret;
}
/* 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);
+ unregister_pernet_device(&ppp_net_ops);
}
/*
- * 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 */
module_init(ppp_init);
module_exit(ppp_cleanup);
+EXPORT_SYMBOL(ppp_register_net_channel);
EXPORT_SYMBOL(ppp_register_channel);
EXPORT_SYMBOL(ppp_unregister_channel);
EXPORT_SYMBOL(ppp_channel_index);
EXPORT_SYMBOL(ppp_unit_number);
+EXPORT_SYMBOL(ppp_dev_name);
EXPORT_SYMBOL(ppp_input);
EXPORT_SYMBOL(ppp_input_error);
EXPORT_SYMBOL(ppp_output_wakeup);
EXPORT_SYMBOL(ppp_register_compressor);
EXPORT_SYMBOL(ppp_unregister_compressor);
MODULE_LICENSE("GPL");
-MODULE_ALIAS_CHARDEV_MAJOR(PPP_MAJOR);
-MODULE_ALIAS("/dev/ppp");
+MODULE_ALIAS_CHARDEV(PPP_MAJOR, 0);
+MODULE_ALIAS("devname:ppp");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff