#include <linux/rwsem.h>
#include <linux/stddef.h>
#include <linux/device.h>
+#include <linux/mutex.h>
#include <net/slhc_vj.h>
#include <asm/atomic.h>
/*
* Bits in flags: SC_NO_TCP_CCID, SC_CCP_OPEN, SC_CCP_UP, SC_LOOP_TRAFFIC,
- * SC_MULTILINK, SC_MP_SHORTSEQ, SC_MP_XSHORTSEQ, SC_COMP_TCP, SC_REJ_COMP_TCP.
+ * SC_MULTILINK, SC_MP_SHORTSEQ, SC_MP_XSHORTSEQ, SC_COMP_TCP, SC_REJ_COMP_TCP,
+ * SC_MUST_COMP
* Bits in rstate: SC_DECOMP_RUN, SC_DC_ERROR, SC_DC_FERROR.
* Bits in xstate: SC_COMP_RUN
*/
#define SC_FLAG_BITS (SC_NO_TCP_CCID|SC_CCP_OPEN|SC_CCP_UP|SC_LOOP_TRAFFIC \
|SC_MULTILINK|SC_MP_SHORTSEQ|SC_MP_XSHORTSEQ \
- |SC_COMP_TCP|SC_REJ_COMP_TCP)
+ |SC_COMP_TCP|SC_REJ_COMP_TCP|SC_MUST_COMP)
/*
* Private data structure for each channel.
static void cardmap_destroy(struct cardmap **map);
/*
- * all_ppp_sem protects the all_ppp_units mapping.
+ * 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 DECLARE_MUTEX(all_ppp_sem);
+static DEFINE_MUTEX(all_ppp_mutex);
static struct cardmap *all_ppp_units;
static atomic_t ppp_unit_count = ATOMIC_INIT(0);
if (copy_from_user(&uprog, arg, sizeof(uprog)))
return -EFAULT;
- if (uprog.len > BPF_MAXINSNS)
- return -EINVAL;
-
if (!uprog.len) {
*p = NULL;
return 0;
/* Attach to an existing ppp unit */
if (get_user(unit, p))
break;
- down(&all_ppp_sem);
+ mutex_lock(&all_ppp_mutex);
err = -ENXIO;
ppp = ppp_find_unit(unit);
if (ppp != 0) {
file->private_data = &ppp->file;
err = 0;
}
- up(&all_ppp_sem);
+ mutex_unlock(&all_ppp_mutex);
break;
case PPPIOCATTCHAN:
ppp_xmit_unlock(ppp);
}
+static inline struct sk_buff *
+pad_compress_skb(struct ppp *ppp, struct sk_buff *skb)
+{
+ struct sk_buff *new_skb;
+ int len;
+ int new_skb_size = ppp->dev->mtu +
+ ppp->xcomp->comp_extra + ppp->dev->hard_header_len;
+ int compressor_skb_size = ppp->dev->mtu +
+ ppp->xcomp->comp_extra + PPP_HDRLEN;
+ new_skb = alloc_skb(new_skb_size, GFP_ATOMIC);
+ if (!new_skb) {
+ if (net_ratelimit())
+ printk(KERN_ERR "PPP: no memory (comp pkt)\n");
+ return NULL;
+ }
+ if (ppp->dev->hard_header_len > PPP_HDRLEN)
+ skb_reserve(new_skb,
+ ppp->dev->hard_header_len - PPP_HDRLEN);
+
+ /* compressor still expects A/C bytes in hdr */
+ len = ppp->xcomp->compress(ppp->xc_state, skb->data - 2,
+ new_skb->data, skb->len + 2,
+ compressor_skb_size);
+ if (len > 0 && (ppp->flags & SC_CCP_UP)) {
+ kfree_skb(skb);
+ skb = new_skb;
+ skb_put(skb, len);
+ skb_pull(skb, 2); /* pull off A/C bytes */
+ } else if (len == 0) {
+ /* didn't compress, or CCP not up yet */
+ kfree_skb(new_skb);
+ new_skb = skb;
+ } else {
+ /*
+ * (len < 0)
+ * MPPE requires that we do not send unencrypted
+ * frames. The compressor will return -1 if we
+ * should drop the frame. We cannot simply test
+ * the compress_proto because MPPE and MPPC share
+ * the same number.
+ */
+ if (net_ratelimit())
+ printk(KERN_ERR "ppp: compressor dropped pkt\n");
+ kfree_skb(skb);
+ kfree_skb(new_skb);
+ new_skb = NULL;
+ }
+ return new_skb;
+}
+
/*
* Compress and send a frame.
* The caller should have locked the xmit path,
/* try to do packet compression */
if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state != 0
&& proto != PPP_LCP && proto != PPP_CCP) {
- new_skb = alloc_skb(ppp->dev->mtu + ppp->dev->hard_header_len,
- GFP_ATOMIC);
- if (new_skb == 0) {
- printk(KERN_ERR "PPP: no memory (comp pkt)\n");
+ 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");
goto drop;
}
- if (ppp->dev->hard_header_len > PPP_HDRLEN)
- skb_reserve(new_skb,
- ppp->dev->hard_header_len - PPP_HDRLEN);
-
- /* compressor still expects A/C bytes in hdr */
- len = ppp->xcomp->compress(ppp->xc_state, skb->data - 2,
- new_skb->data, skb->len + 2,
- ppp->dev->mtu + PPP_HDRLEN);
- if (len > 0 && (ppp->flags & SC_CCP_UP)) {
- kfree_skb(skb);
- skb = new_skb;
- skb_put(skb, len);
- skb_pull(skb, 2); /* pull off A/C bytes */
- } else {
- /* didn't compress, or CCP not up yet */
- kfree_skb(new_skb);
- }
+ skb = pad_compress_skb(ppp, skb);
+ if (!skb)
+ goto drop;
}
/*
return;
drop:
- kfree_skb(skb);
+ if (skb)
+ kfree_skb(skb);
++ppp->stats.tx_errors;
}
&& (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)
+ goto err;
+
proto = PPP_PROTO(skb);
switch (proto) {
case PPP_VJC_COMP:
kfree_skb(skb);
skb = ns;
}
- else if (!pskb_may_pull(skb, skb->len))
- goto err;
+ else
+ skb->ip_summed = CHECKSUM_NONE;
len = slhc_uncompress(ppp->vj, skb->data + 2, skb->len - 2);
if (len <= 0) {
|| ppp->npmode[npi] != NPMODE_PASS) {
kfree_skb(skb);
} else {
- skb_pull(skb, 2); /* chop off protocol */
+ /* chop off protocol */
+ skb_pull_rcsum(skb, 2);
skb->dev = ppp->dev;
skb->protocol = htons(npindex_to_ethertype[npi]);
skb->mac.raw = skb->data;
dev->do_ioctl = ppp_net_ioctl;
ret = -EEXIST;
- down(&all_ppp_sem);
+ 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)
atomic_inc(&ppp_unit_count);
cardmap_set(&all_ppp_units, unit, ppp);
- up(&all_ppp_sem);
+ mutex_unlock(&all_ppp_mutex);
*retp = 0;
return ppp;
out2:
- up(&all_ppp_sem);
+ mutex_unlock(&all_ppp_mutex);
free_netdev(dev);
out1:
kfree(ppp);
{
struct net_device *dev;
- down(&all_ppp_sem);
+ mutex_lock(&all_ppp_mutex);
ppp_lock(ppp);
dev = ppp->dev;
ppp->dev = NULL;
ppp->file.dead = 1;
ppp->owner = NULL;
wake_up_interruptible(&ppp->file.rwait);
- up(&all_ppp_sem);
+ mutex_unlock(&all_ppp_mutex);
}
/*
/*
* Locate an existing ppp unit.
- * The caller should have locked the all_ppp_sem.
+ * The caller should have locked the all_ppp_mutex.
*/
static struct ppp *
ppp_find_unit(int unit)
list_for_each_entry(pch, &new_channels, list) {
if (pch->file.index == unit) {
- list_del(&pch->list);
- list_add(&pch->list, &all_channels);
+ list_move(&pch->list, &all_channels);
return pch;
}
}
int ret = -ENXIO;
int hdrlen;
- down(&all_ppp_sem);
+ mutex_lock(&all_ppp_mutex);
ppp = ppp_find_unit(unit);
if (ppp == 0)
goto out;
outl:
write_unlock_bh(&pch->upl);
out:
- up(&all_ppp_sem);
+ mutex_unlock(&all_ppp_mutex);
return ret;
}
git.openpandora.org / pandora-kernel.git / blobdiff